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-rw-r--r--drivers/hid/i2c-hid/Kconfig80
-rw-r--r--drivers/hid/i2c-hid/Makefile14
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-acpi.c135
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-core.c1339
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c494
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-of-elan.c155
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-of-goodix.c139
-rw-r--r--drivers/hid/i2c-hid/i2c-hid-of.c170
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.h45
9 files changed, 2571 insertions, 0 deletions
diff --git a/drivers/hid/i2c-hid/Kconfig b/drivers/hid/i2c-hid/Kconfig
new file mode 100644
index 0000000000..ef7c595c94
--- /dev/null
+++ b/drivers/hid/i2c-hid/Kconfig
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig I2C_HID
+ tristate "I2C HID support"
+ default y
+ depends on I2C && INPUT && HID
+
+if I2C_HID
+
+config I2C_HID_ACPI
+ tristate "HID over I2C transport layer ACPI driver"
+ depends on ACPI
+ depends on DRM || !DRM
+ select I2C_HID_CORE
+ help
+ Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
+ other HID based devices which is connected to your computer via I2C.
+ This driver supports ACPI-based systems.
+
+ If unsure, say N.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-hid-acpi. It will also build/depend on the
+ module i2c-hid.
+
+config I2C_HID_OF
+ tristate "HID over I2C transport layer Open Firmware driver"
+ # No "depends on OF" because this can also be used for manually
+ # (board-file) instantiated "hid-over-i2c" type i2c-clients.
+ depends on DRM || !DRM
+ select I2C_HID_CORE
+ help
+ Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
+ other HID based devices which is connected to your computer via I2C.
+ This driver supports Open Firmware (Device Tree)-based systems as
+ well as binding to manually (board-file) instantiated i2c-hid-clients.
+
+ If unsure, say N.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-hid-of. It will also build/depend on the
+ module i2c-hid.
+
+config I2C_HID_OF_ELAN
+ tristate "Driver for Elan hid-i2c based devices on OF systems"
+ depends on OF
+ depends on DRM || !DRM
+ select I2C_HID_CORE
+ help
+ Say Y here if you want support for Elan i2c devices that use
+ the i2c-hid protocol on Open Firmware (Device Tree)-based
+ systems.
+
+ If unsure, say N.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-hid-of-elan. It will also build/depend on
+ the module i2c-hid.
+
+config I2C_HID_OF_GOODIX
+ tristate "Driver for Goodix hid-i2c based devices on OF systems"
+ depends on OF
+ depends on DRM || !DRM
+ select I2C_HID_CORE
+ help
+ Say Y here if you want support for Goodix i2c devices that use
+ the i2c-hid protocol on Open Firmware (Device Tree)-based
+ systems.
+
+ If unsure, say N.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-hid-of-goodix. It will also build/depend on
+ the module i2c-hid.
+
+config I2C_HID_CORE
+ tristate
+ # We need to call into panel code so if DRM=m, this can't be 'y'
+ depends on DRM || !DRM
+endif
+
diff --git a/drivers/hid/i2c-hid/Makefile b/drivers/hid/i2c-hid/Makefile
new file mode 100644
index 0000000000..55bd5e0f35
--- /dev/null
+++ b/drivers/hid/i2c-hid/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the I2C input drivers
+#
+
+obj-$(CONFIG_I2C_HID_CORE) += i2c-hid.o
+
+i2c-hid-objs = i2c-hid-core.o
+i2c-hid-$(CONFIG_DMI) += i2c-hid-dmi-quirks.o
+
+obj-$(CONFIG_I2C_HID_ACPI) += i2c-hid-acpi.o
+obj-$(CONFIG_I2C_HID_OF) += i2c-hid-of.o
+obj-$(CONFIG_I2C_HID_OF_ELAN) += i2c-hid-of-elan.o
+obj-$(CONFIG_I2C_HID_OF_GOODIX) += i2c-hid-of-goodix.o
diff --git a/drivers/hid/i2c-hid/i2c-hid-acpi.c b/drivers/hid/i2c-hid/i2c-hid-acpi.c
new file mode 100644
index 0000000000..1b49243adb
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-acpi.c
@@ -0,0 +1,135 @@
+/*
+ * HID over I2C ACPI Subclass
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2012 Red Hat, Inc
+ *
+ * This code was forked out of the core code, which was partly based on
+ * "USB HID support for Linux":
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ * Copyright (c) 2007-2008 Oliver Neukum
+ * Copyright (c) 2006-2010 Jiri Kosina
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/uuid.h>
+
+#include "i2c-hid.h"
+
+struct i2c_hid_acpi {
+ struct i2chid_ops ops;
+ struct acpi_device *adev;
+};
+
+static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
+ /*
+ * The CHPN0001 ACPI device, which is used to describe the Chipone
+ * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
+ */
+ { "CHPN0001" },
+ /*
+ * The IDEA5002 ACPI device causes high interrupt usage and spurious
+ * wakeups from suspend.
+ */
+ { "IDEA5002" },
+ { }
+};
+
+/* HID I²C Device: 3cdff6f7-4267-4555-ad05-b30a3d8938de */
+static guid_t i2c_hid_guid =
+ GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
+ 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
+
+static int i2c_hid_acpi_get_descriptor(struct i2c_hid_acpi *ihid_acpi)
+{
+ struct acpi_device *adev = ihid_acpi->adev;
+ acpi_handle handle = acpi_device_handle(adev);
+ union acpi_object *obj;
+ u16 hid_descriptor_address;
+
+ if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
+ return -ENODEV;
+
+ obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
+ ACPI_TYPE_INTEGER);
+ if (!obj) {
+ acpi_handle_err(handle, "Error _DSM call to get HID descriptor address failed\n");
+ return -ENODEV;
+ }
+
+ hid_descriptor_address = obj->integer.value;
+ ACPI_FREE(obj);
+
+ return hid_descriptor_address;
+}
+
+static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
+{
+ struct i2c_hid_acpi *ihid_acpi = container_of(ops, struct i2c_hid_acpi, ops);
+
+ acpi_device_set_power(ihid_acpi->adev, ACPI_STATE_D3_COLD);
+}
+
+static int i2c_hid_acpi_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct i2c_hid_acpi *ihid_acpi;
+ u16 hid_descriptor_address;
+ int ret;
+
+ ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
+ if (!ihid_acpi)
+ return -ENOMEM;
+
+ ihid_acpi->adev = ACPI_COMPANION(dev);
+ ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
+
+ ret = i2c_hid_acpi_get_descriptor(ihid_acpi);
+ if (ret < 0)
+ return ret;
+ hid_descriptor_address = ret;
+
+ acpi_device_fix_up_power(ihid_acpi->adev);
+
+ return i2c_hid_core_probe(client, &ihid_acpi->ops,
+ hid_descriptor_address, 0);
+}
+
+static const struct acpi_device_id i2c_hid_acpi_match[] = {
+ { "ACPI0C50" },
+ { "PNP0C50" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
+
+static struct i2c_driver i2c_hid_acpi_driver = {
+ .driver = {
+ .name = "i2c_hid_acpi",
+ .pm = &i2c_hid_core_pm,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .acpi_match_table = i2c_hid_acpi_match,
+ },
+
+ .probe = i2c_hid_acpi_probe,
+ .remove = i2c_hid_core_remove,
+ .shutdown = i2c_hid_core_shutdown,
+};
+
+module_i2c_driver(i2c_hid_acpi_driver);
+
+MODULE_DESCRIPTION("HID over I2C ACPI driver");
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
new file mode 100644
index 0000000000..2735cd585a
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -0,0 +1,1339 @@
+/*
+ * HID over I2C protocol implementation
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2012 Red Hat, Inc
+ *
+ * This code is partly based on "USB HID support for Linux":
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ * Copyright (c) 2007-2008 Oliver Neukum
+ * Copyright (c) 2006-2010 Jiri Kosina
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/pm.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/hid.h>
+#include <linux/mutex.h>
+#include <asm/unaligned.h>
+
+#include <drm/drm_panel.h>
+
+#include "../hid-ids.h"
+#include "i2c-hid.h"
+
+/* quirks to control the device */
+#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0)
+#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
+#define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
+#define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
+#define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
+#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET BIT(7)
+
+/* Command opcodes */
+#define I2C_HID_OPCODE_RESET 0x01
+#define I2C_HID_OPCODE_GET_REPORT 0x02
+#define I2C_HID_OPCODE_SET_REPORT 0x03
+#define I2C_HID_OPCODE_GET_IDLE 0x04
+#define I2C_HID_OPCODE_SET_IDLE 0x05
+#define I2C_HID_OPCODE_GET_PROTOCOL 0x06
+#define I2C_HID_OPCODE_SET_PROTOCOL 0x07
+#define I2C_HID_OPCODE_SET_POWER 0x08
+
+/* flags */
+#define I2C_HID_STARTED 0
+#define I2C_HID_RESET_PENDING 1
+#define I2C_HID_READ_PENDING 2
+
+#define I2C_HID_PWR_ON 0x00
+#define I2C_HID_PWR_SLEEP 0x01
+
+#define i2c_hid_dbg(ihid, ...) dev_dbg(&(ihid)->client->dev, __VA_ARGS__)
+
+struct i2c_hid_desc {
+ __le16 wHIDDescLength;
+ __le16 bcdVersion;
+ __le16 wReportDescLength;
+ __le16 wReportDescRegister;
+ __le16 wInputRegister;
+ __le16 wMaxInputLength;
+ __le16 wOutputRegister;
+ __le16 wMaxOutputLength;
+ __le16 wCommandRegister;
+ __le16 wDataRegister;
+ __le16 wVendorID;
+ __le16 wProductID;
+ __le16 wVersionID;
+ __le32 reserved;
+} __packed;
+
+/* The main device structure */
+struct i2c_hid {
+ struct i2c_client *client; /* i2c client */
+ struct hid_device *hid; /* pointer to corresponding HID dev */
+ struct i2c_hid_desc hdesc; /* the HID Descriptor */
+ __le16 wHIDDescRegister; /* location of the i2c
+ * register of the HID
+ * descriptor. */
+ unsigned int bufsize; /* i2c buffer size */
+ u8 *inbuf; /* Input buffer */
+ u8 *rawbuf; /* Raw Input buffer */
+ u8 *cmdbuf; /* Command buffer */
+
+ unsigned long flags; /* device flags */
+ unsigned long quirks; /* Various quirks */
+
+ wait_queue_head_t wait; /* For waiting the interrupt */
+
+ struct mutex reset_lock;
+
+ struct i2chid_ops *ops;
+ struct drm_panel_follower panel_follower;
+ struct work_struct panel_follower_prepare_work;
+ bool is_panel_follower;
+ bool prepare_work_finished;
+};
+
+static const struct i2c_hid_quirks {
+ __u16 idVendor;
+ __u16 idProduct;
+ __u32 quirks;
+} i2c_hid_quirks[] = {
+ { USB_VENDOR_ID_WEIDA, HID_ANY_ID,
+ I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+ { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
+ I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
+ { I2C_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_VOYO_WINPAD_A15,
+ I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
+ { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
+ I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
+ { USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
+ I2C_HID_QUIRK_RESET_ON_RESUME },
+ { I2C_VENDOR_ID_SYNAPTICS, I2C_PRODUCT_ID_SYNAPTICS_SYNA2393,
+ I2C_HID_QUIRK_RESET_ON_RESUME },
+ { USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
+ I2C_HID_QUIRK_BAD_INPUT_SIZE },
+ /*
+ * Sending the wakeup after reset actually break ELAN touchscreen controller
+ */
+ { USB_VENDOR_ID_ELAN, HID_ANY_ID,
+ I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET |
+ I2C_HID_QUIRK_BOGUS_IRQ },
+ { 0, 0 }
+};
+
+/*
+ * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
+ * @idVendor: the 16-bit vendor ID
+ * @idProduct: the 16-bit product ID
+ *
+ * Returns: a u32 quirks value.
+ */
+static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
+{
+ u32 quirks = 0;
+ int n;
+
+ for (n = 0; i2c_hid_quirks[n].idVendor; n++)
+ if (i2c_hid_quirks[n].idVendor == idVendor &&
+ (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
+ i2c_hid_quirks[n].idProduct == idProduct))
+ quirks = i2c_hid_quirks[n].quirks;
+
+ return quirks;
+}
+
+static int i2c_hid_xfer(struct i2c_hid *ihid,
+ u8 *send_buf, int send_len, u8 *recv_buf, int recv_len)
+{
+ struct i2c_client *client = ihid->client;
+ struct i2c_msg msgs[2] = { 0 };
+ int n = 0;
+ int ret;
+
+ if (send_len) {
+ i2c_hid_dbg(ihid, "%s: cmd=%*ph\n",
+ __func__, send_len, send_buf);
+
+ msgs[n].addr = client->addr;
+ msgs[n].flags = (client->flags & I2C_M_TEN) | I2C_M_DMA_SAFE;
+ msgs[n].len = send_len;
+ msgs[n].buf = send_buf;
+ n++;
+ }
+
+ if (recv_len) {
+ msgs[n].addr = client->addr;
+ msgs[n].flags = (client->flags & I2C_M_TEN) |
+ I2C_M_RD | I2C_M_DMA_SAFE;
+ msgs[n].len = recv_len;
+ msgs[n].buf = recv_buf;
+ n++;
+
+ set_bit(I2C_HID_READ_PENDING, &ihid->flags);
+ }
+
+ ret = i2c_transfer(client->adapter, msgs, n);
+
+ if (recv_len)
+ clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
+
+ if (ret != n)
+ return ret < 0 ? ret : -EIO;
+
+ return 0;
+}
+
+static int i2c_hid_read_register(struct i2c_hid *ihid, __le16 reg,
+ void *buf, size_t len)
+{
+ *(__le16 *)ihid->cmdbuf = reg;
+
+ return i2c_hid_xfer(ihid, ihid->cmdbuf, sizeof(__le16), buf, len);
+}
+
+static size_t i2c_hid_encode_command(u8 *buf, u8 opcode,
+ int report_type, int report_id)
+{
+ size_t length = 0;
+
+ if (report_id < 0x0F) {
+ buf[length++] = report_type << 4 | report_id;
+ buf[length++] = opcode;
+ } else {
+ buf[length++] = report_type << 4 | 0x0F;
+ buf[length++] = opcode;
+ buf[length++] = report_id;
+ }
+
+ return length;
+}
+
+static int i2c_hid_get_report(struct i2c_hid *ihid,
+ u8 report_type, u8 report_id,
+ u8 *recv_buf, size_t recv_len)
+{
+ size_t length = 0;
+ size_t ret_count;
+ int error;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ /* Command register goes first */
+ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
+ length += sizeof(__le16);
+ /* Next is GET_REPORT command */
+ length += i2c_hid_encode_command(ihid->cmdbuf + length,
+ I2C_HID_OPCODE_GET_REPORT,
+ report_type, report_id);
+ /*
+ * Device will send report data through data register. Because
+ * command can be either 2 or 3 bytes destination for the data
+ * register may be not aligned.
+ */
+ put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
+ ihid->cmdbuf + length);
+ length += sizeof(__le16);
+
+ /*
+ * In addition to report data device will supply data length
+ * in the first 2 bytes of the response, so adjust .
+ */
+ error = i2c_hid_xfer(ihid, ihid->cmdbuf, length,
+ ihid->rawbuf, recv_len + sizeof(__le16));
+ if (error) {
+ dev_err(&ihid->client->dev,
+ "failed to set a report to device: %d\n", error);
+ return error;
+ }
+
+ /* The buffer is sufficiently aligned */
+ ret_count = le16_to_cpup((__le16 *)ihid->rawbuf);
+
+ /* Check for empty report response */
+ if (ret_count <= sizeof(__le16))
+ return 0;
+
+ recv_len = min(recv_len, ret_count - sizeof(__le16));
+ memcpy(recv_buf, ihid->rawbuf + sizeof(__le16), recv_len);
+
+ if (report_id && recv_len != 0 && recv_buf[0] != report_id) {
+ dev_err(&ihid->client->dev,
+ "device returned incorrect report (%d vs %d expected)\n",
+ recv_buf[0], report_id);
+ return -EINVAL;
+ }
+
+ return recv_len;
+}
+
+static size_t i2c_hid_format_report(u8 *buf, int report_id,
+ const u8 *data, size_t size)
+{
+ size_t length = sizeof(__le16); /* reserve space to store size */
+
+ if (report_id)
+ buf[length++] = report_id;
+
+ memcpy(buf + length, data, size);
+ length += size;
+
+ /* Store overall size in the beginning of the buffer */
+ put_unaligned_le16(length, buf);
+
+ return length;
+}
+
+/**
+ * i2c_hid_set_or_send_report: forward an incoming report to the device
+ * @ihid: the i2c hid device
+ * @report_type: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
+ * @report_id: the report ID
+ * @buf: the actual data to transfer, without the report ID
+ * @data_len: size of buf
+ * @do_set: true: use SET_REPORT HID command, false: send plain OUTPUT report
+ */
+static int i2c_hid_set_or_send_report(struct i2c_hid *ihid,
+ u8 report_type, u8 report_id,
+ const u8 *buf, size_t data_len,
+ bool do_set)
+{
+ size_t length = 0;
+ int error;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ if (data_len > ihid->bufsize)
+ return -EINVAL;
+
+ if (!do_set && le16_to_cpu(ihid->hdesc.wMaxOutputLength) == 0)
+ return -ENOSYS;
+
+ if (do_set) {
+ /* Command register goes first */
+ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
+ length += sizeof(__le16);
+ /* Next is SET_REPORT command */
+ length += i2c_hid_encode_command(ihid->cmdbuf + length,
+ I2C_HID_OPCODE_SET_REPORT,
+ report_type, report_id);
+ /*
+ * Report data will go into the data register. Because
+ * command can be either 2 or 3 bytes destination for
+ * the data register may be not aligned.
+ */
+ put_unaligned_le16(le16_to_cpu(ihid->hdesc.wDataRegister),
+ ihid->cmdbuf + length);
+ length += sizeof(__le16);
+ } else {
+ /*
+ * With simple "send report" all data goes into the output
+ * register.
+ */
+ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wOutputRegister;
+ length += sizeof(__le16);
+ }
+
+ length += i2c_hid_format_report(ihid->cmdbuf + length,
+ report_id, buf, data_len);
+
+ error = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
+ if (error) {
+ dev_err(&ihid->client->dev,
+ "failed to set a report to device: %d\n", error);
+ return error;
+ }
+
+ return data_len;
+}
+
+static int i2c_hid_set_power_command(struct i2c_hid *ihid, int power_state)
+{
+ size_t length;
+
+ /* SET_POWER uses command register */
+ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
+ length = sizeof(__le16);
+
+ /* Now the command itself */
+ length += i2c_hid_encode_command(ihid->cmdbuf + length,
+ I2C_HID_OPCODE_SET_POWER,
+ 0, power_state);
+
+ return i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
+}
+
+static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
+{
+ int ret;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ /*
+ * Some devices require to send a command to wakeup before power on.
+ * The call will get a return value (EREMOTEIO) but device will be
+ * triggered and activated. After that, it goes like a normal device.
+ */
+ if (power_state == I2C_HID_PWR_ON &&
+ ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
+ ret = i2c_hid_set_power_command(ihid, I2C_HID_PWR_ON);
+
+ /* Device was already activated */
+ if (!ret)
+ goto set_pwr_exit;
+ }
+
+ ret = i2c_hid_set_power_command(ihid, power_state);
+ if (ret)
+ dev_err(&ihid->client->dev,
+ "failed to change power setting.\n");
+
+set_pwr_exit:
+
+ /*
+ * The HID over I2C specification states that if a DEVICE needs time
+ * after the PWR_ON request, it should utilise CLOCK stretching.
+ * However, it has been observered that the Windows driver provides a
+ * 1ms sleep between the PWR_ON and RESET requests.
+ * According to Goodix Windows even waits 60 ms after (other?)
+ * PWR_ON requests. Testing has confirmed that several devices
+ * will not work properly without a delay after a PWR_ON request.
+ */
+ if (!ret && power_state == I2C_HID_PWR_ON)
+ msleep(60);
+
+ return ret;
+}
+
+static int i2c_hid_execute_reset(struct i2c_hid *ihid)
+{
+ size_t length = 0;
+ int ret;
+
+ i2c_hid_dbg(ihid, "resetting...\n");
+
+ /* Prepare reset command. Command register goes first. */
+ *(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
+ length += sizeof(__le16);
+ /* Next is RESET command itself */
+ length += i2c_hid_encode_command(ihid->cmdbuf + length,
+ I2C_HID_OPCODE_RESET, 0, 0);
+
+ set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+
+ ret = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
+ if (ret) {
+ dev_err(&ihid->client->dev, "failed to reset device.\n");
+ goto out;
+ }
+
+ if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
+ msleep(100);
+ goto out;
+ }
+
+ i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
+ if (!wait_event_timeout(ihid->wait,
+ !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
+ msecs_to_jiffies(5000))) {
+ ret = -ENODATA;
+ goto out;
+ }
+ i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
+
+out:
+ clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+ return ret;
+}
+
+static int i2c_hid_hwreset(struct i2c_hid *ihid)
+{
+ int ret;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ /*
+ * This prevents sending feature reports while the device is
+ * being reset. Otherwise we may lose the reset complete
+ * interrupt.
+ */
+ mutex_lock(&ihid->reset_lock);
+
+ ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+ if (ret)
+ goto out_unlock;
+
+ ret = i2c_hid_execute_reset(ihid);
+ if (ret) {
+ dev_err(&ihid->client->dev,
+ "failed to reset device: %d\n", ret);
+ i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
+ goto out_unlock;
+ }
+
+ /* At least some SIS devices need this after reset */
+ if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
+ ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+
+out_unlock:
+ mutex_unlock(&ihid->reset_lock);
+ return ret;
+}
+
+static void i2c_hid_get_input(struct i2c_hid *ihid)
+{
+ u16 size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
+ u16 ret_size;
+ int ret;
+
+ if (size > ihid->bufsize)
+ size = ihid->bufsize;
+
+ ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
+ if (ret != size) {
+ if (ret < 0)
+ return;
+
+ dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
+ __func__, ret, size);
+ return;
+ }
+
+ /* Receiving buffer is properly aligned */
+ ret_size = le16_to_cpup((__le16 *)ihid->inbuf);
+ if (!ret_size) {
+ /* host or device initiated RESET completed */
+ if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
+ wake_up(&ihid->wait);
+ return;
+ }
+
+ if ((ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ) && ret_size == 0xffff) {
+ dev_warn_once(&ihid->client->dev,
+ "%s: IRQ triggered but there's no data\n",
+ __func__);
+ return;
+ }
+
+ if (ret_size > size || ret_size < sizeof(__le16)) {
+ if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
+ *(__le16 *)ihid->inbuf = cpu_to_le16(size);
+ ret_size = size;
+ } else {
+ dev_err(&ihid->client->dev,
+ "%s: incomplete report (%d/%d)\n",
+ __func__, size, ret_size);
+ return;
+ }
+ }
+
+ i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
+
+ if (test_bit(I2C_HID_STARTED, &ihid->flags)) {
+ if (ihid->hid->group != HID_GROUP_RMI)
+ pm_wakeup_event(&ihid->client->dev, 0);
+
+ hid_input_report(ihid->hid, HID_INPUT_REPORT,
+ ihid->inbuf + sizeof(__le16),
+ ret_size - sizeof(__le16), 1);
+ }
+
+ return;
+}
+
+static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
+{
+ struct i2c_hid *ihid = dev_id;
+
+ if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
+ return IRQ_HANDLED;
+
+ i2c_hid_get_input(ihid);
+
+ return IRQ_HANDLED;
+}
+
+static int i2c_hid_get_report_length(struct hid_report *report)
+{
+ return ((report->size - 1) >> 3) + 1 +
+ report->device->report_enum[report->type].numbered + 2;
+}
+
+/*
+ * Traverse the supplied list of reports and find the longest
+ */
+static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
+ unsigned int *max)
+{
+ struct hid_report *report;
+ unsigned int size;
+
+ /* We should not rely on wMaxInputLength, as some devices may set it to
+ * a wrong length. */
+ list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
+ size = i2c_hid_get_report_length(report);
+ if (*max < size)
+ *max = size;
+ }
+}
+
+static void i2c_hid_free_buffers(struct i2c_hid *ihid)
+{
+ kfree(ihid->inbuf);
+ kfree(ihid->rawbuf);
+ kfree(ihid->cmdbuf);
+ ihid->inbuf = NULL;
+ ihid->rawbuf = NULL;
+ ihid->cmdbuf = NULL;
+ ihid->bufsize = 0;
+}
+
+static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
+{
+ /*
+ * The worst case is computed from the set_report command with a
+ * reportID > 15 and the maximum report length.
+ */
+ int cmd_len = sizeof(__le16) + /* command register */
+ sizeof(u8) + /* encoded report type/ID */
+ sizeof(u8) + /* opcode */
+ sizeof(u8) + /* optional 3rd byte report ID */
+ sizeof(__le16) + /* data register */
+ sizeof(__le16) + /* report data size */
+ sizeof(u8) + /* report ID if numbered report */
+ report_size;
+
+ ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
+ ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
+ ihid->cmdbuf = kzalloc(cmd_len, GFP_KERNEL);
+
+ if (!ihid->inbuf || !ihid->rawbuf || !ihid->cmdbuf) {
+ i2c_hid_free_buffers(ihid);
+ return -ENOMEM;
+ }
+
+ ihid->bufsize = report_size;
+
+ return 0;
+}
+
+static int i2c_hid_get_raw_report(struct hid_device *hid,
+ u8 report_type, u8 report_id,
+ u8 *buf, size_t count)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret_count;
+
+ if (report_type == HID_OUTPUT_REPORT)
+ return -EINVAL;
+
+ /*
+ * In case of unnumbered reports the response from the device will
+ * not have the report ID that the upper layers expect, so we need
+ * to stash it the buffer ourselves and adjust the data size.
+ */
+ if (!report_id) {
+ buf[0] = 0;
+ buf++;
+ count--;
+ }
+
+ ret_count = i2c_hid_get_report(ihid,
+ report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
+ report_id, buf, count);
+
+ if (ret_count > 0 && !report_id)
+ ret_count++;
+
+ return ret_count;
+}
+
+static int i2c_hid_output_raw_report(struct hid_device *hid, u8 report_type,
+ const u8 *buf, size_t count, bool do_set)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int report_id = buf[0];
+ int ret;
+
+ if (report_type == HID_INPUT_REPORT)
+ return -EINVAL;
+
+ mutex_lock(&ihid->reset_lock);
+
+ /*
+ * Note that both numbered and unnumbered reports passed here
+ * are supposed to have report ID stored in the 1st byte of the
+ * buffer, so we strip it off unconditionally before passing payload
+ * to i2c_hid_set_or_send_report which takes care of encoding
+ * everything properly.
+ */
+ ret = i2c_hid_set_or_send_report(ihid,
+ report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
+ report_id, buf + 1, count - 1, do_set);
+
+ if (ret >= 0)
+ ret++; /* add report_id to the number of transferred bytes */
+
+ mutex_unlock(&ihid->reset_lock);
+
+ return ret;
+}
+
+static int i2c_hid_output_report(struct hid_device *hid, u8 *buf, size_t count)
+{
+ return i2c_hid_output_raw_report(hid, HID_OUTPUT_REPORT, buf, count,
+ false);
+}
+
+static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
+ __u8 *buf, size_t len, unsigned char rtype,
+ int reqtype)
+{
+ switch (reqtype) {
+ case HID_REQ_GET_REPORT:
+ return i2c_hid_get_raw_report(hid, rtype, reportnum, buf, len);
+ case HID_REQ_SET_REPORT:
+ if (buf[0] != reportnum)
+ return -EINVAL;
+ return i2c_hid_output_raw_report(hid, rtype, buf, len, true);
+ default:
+ return -EIO;
+ }
+}
+
+static int i2c_hid_parse(struct hid_device *hid)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ struct i2c_hid_desc *hdesc = &ihid->hdesc;
+ unsigned int rsize;
+ char *rdesc;
+ int ret;
+ int tries = 3;
+ char *use_override;
+
+ i2c_hid_dbg(ihid, "entering %s\n", __func__);
+
+ rsize = le16_to_cpu(hdesc->wReportDescLength);
+ if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
+ dbg_hid("weird size of report descriptor (%u)\n", rsize);
+ return -EINVAL;
+ }
+
+ do {
+ ret = i2c_hid_hwreset(ihid);
+ if (ret)
+ msleep(1000);
+ } while (tries-- > 0 && ret);
+
+ if (ret)
+ return ret;
+
+ use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
+ &rsize);
+
+ if (use_override) {
+ rdesc = use_override;
+ i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
+ } else {
+ rdesc = kzalloc(rsize, GFP_KERNEL);
+
+ if (!rdesc) {
+ dbg_hid("couldn't allocate rdesc memory\n");
+ return -ENOMEM;
+ }
+
+ i2c_hid_dbg(ihid, "asking HID report descriptor\n");
+
+ ret = i2c_hid_read_register(ihid,
+ ihid->hdesc.wReportDescRegister,
+ rdesc, rsize);
+ if (ret) {
+ hid_err(hid, "reading report descriptor failed\n");
+ kfree(rdesc);
+ return -EIO;
+ }
+ }
+
+ i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
+
+ ret = hid_parse_report(hid, rdesc, rsize);
+ if (!use_override)
+ kfree(rdesc);
+
+ if (ret) {
+ dbg_hid("parsing report descriptor failed\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int i2c_hid_start(struct hid_device *hid)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret;
+ unsigned int bufsize = HID_MIN_BUFFER_SIZE;
+
+ i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
+ i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
+ i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
+
+ if (bufsize > ihid->bufsize) {
+ disable_irq(client->irq);
+ i2c_hid_free_buffers(ihid);
+
+ ret = i2c_hid_alloc_buffers(ihid, bufsize);
+ enable_irq(client->irq);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void i2c_hid_stop(struct hid_device *hid)
+{
+ hid->claimed = 0;
+}
+
+static int i2c_hid_open(struct hid_device *hid)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ set_bit(I2C_HID_STARTED, &ihid->flags);
+ return 0;
+}
+
+static void i2c_hid_close(struct hid_device *hid)
+{
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ clear_bit(I2C_HID_STARTED, &ihid->flags);
+}
+
+static const struct hid_ll_driver i2c_hid_ll_driver = {
+ .parse = i2c_hid_parse,
+ .start = i2c_hid_start,
+ .stop = i2c_hid_stop,
+ .open = i2c_hid_open,
+ .close = i2c_hid_close,
+ .output_report = i2c_hid_output_report,
+ .raw_request = i2c_hid_raw_request,
+};
+
+static int i2c_hid_init_irq(struct i2c_client *client)
+{
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ unsigned long irqflags = 0;
+ int ret;
+
+ i2c_hid_dbg(ihid, "Requesting IRQ: %d\n", client->irq);
+
+ if (!irq_get_trigger_type(client->irq))
+ irqflags = IRQF_TRIGGER_LOW;
+
+ ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
+ irqflags | IRQF_ONESHOT | IRQF_NO_AUTOEN,
+ client->name, ihid);
+ if (ret < 0) {
+ dev_warn(&client->dev,
+ "Could not register for %s interrupt, irq = %d,"
+ " ret = %d\n",
+ client->name, client->irq, ret);
+
+ return ret;
+ }
+
+ return 0;
+}
+
+static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
+{
+ struct i2c_client *client = ihid->client;
+ struct i2c_hid_desc *hdesc = &ihid->hdesc;
+ unsigned int dsize;
+ int error;
+
+ /* i2c hid fetch using a fixed descriptor size (30 bytes) */
+ if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
+ i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
+ ihid->hdesc =
+ *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
+ } else {
+ i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
+ error = i2c_hid_read_register(ihid,
+ ihid->wHIDDescRegister,
+ &ihid->hdesc,
+ sizeof(ihid->hdesc));
+ if (error) {
+ dev_err(&ihid->client->dev,
+ "failed to fetch HID descriptor: %d\n",
+ error);
+ return -ENODEV;
+ }
+ }
+
+ /* Validate the length of HID descriptor, the 4 first bytes:
+ * bytes 0-1 -> length
+ * bytes 2-3 -> bcdVersion (has to be 1.00) */
+ /* check bcdVersion == 1.0 */
+ if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
+ dev_err(&ihid->client->dev,
+ "unexpected HID descriptor bcdVersion (0x%04hx)\n",
+ le16_to_cpu(hdesc->bcdVersion));
+ return -ENODEV;
+ }
+
+ /* Descriptor length should be 30 bytes as per the specification */
+ dsize = le16_to_cpu(hdesc->wHIDDescLength);
+ if (dsize != sizeof(struct i2c_hid_desc)) {
+ dev_err(&ihid->client->dev,
+ "weird size of HID descriptor (%u)\n", dsize);
+ return -ENODEV;
+ }
+ i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, &ihid->hdesc);
+ return 0;
+}
+
+static int i2c_hid_core_power_up(struct i2c_hid *ihid)
+{
+ if (!ihid->ops->power_up)
+ return 0;
+
+ return ihid->ops->power_up(ihid->ops);
+}
+
+static void i2c_hid_core_power_down(struct i2c_hid *ihid)
+{
+ if (!ihid->ops->power_down)
+ return;
+
+ ihid->ops->power_down(ihid->ops);
+}
+
+static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid)
+{
+ if (!ihid->ops->shutdown_tail)
+ return;
+
+ ihid->ops->shutdown_tail(ihid->ops);
+}
+
+static int i2c_hid_core_suspend(struct i2c_hid *ihid, bool force_poweroff)
+{
+ struct i2c_client *client = ihid->client;
+ struct hid_device *hid = ihid->hid;
+ int ret;
+
+ ret = hid_driver_suspend(hid, PMSG_SUSPEND);
+ if (ret < 0)
+ return ret;
+
+ /* Save some power */
+ i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
+
+ disable_irq(client->irq);
+
+ if (force_poweroff || !device_may_wakeup(&client->dev))
+ i2c_hid_core_power_down(ihid);
+
+ return 0;
+}
+
+static int i2c_hid_core_resume(struct i2c_hid *ihid)
+{
+ struct i2c_client *client = ihid->client;
+ struct hid_device *hid = ihid->hid;
+ int ret;
+
+ if (!device_may_wakeup(&client->dev))
+ i2c_hid_core_power_up(ihid);
+
+ enable_irq(client->irq);
+
+ /* Instead of resetting device, simply powers the device on. This
+ * solves "incomplete reports" on Raydium devices 2386:3118 and
+ * 2386:4B33 and fixes various SIS touchscreens no longer sending
+ * data after a suspend/resume.
+ *
+ * However some ALPS touchpads generate IRQ storm without reset, so
+ * let's still reset them here.
+ */
+ if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
+ ret = i2c_hid_hwreset(ihid);
+ else
+ ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+
+ if (ret)
+ return ret;
+
+ return hid_driver_reset_resume(hid);
+}
+
+/*
+ * Check that the device exists and parse the HID descriptor.
+ */
+static int __i2c_hid_core_probe(struct i2c_hid *ihid)
+{
+ struct i2c_client *client = ihid->client;
+ struct hid_device *hid = ihid->hid;
+ int ret;
+
+ /* Make sure there is something at this address */
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ i2c_hid_dbg(ihid, "nothing at this address: %d\n", ret);
+ return -ENXIO;
+ }
+
+ ret = i2c_hid_fetch_hid_descriptor(ihid);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to fetch the HID Descriptor\n");
+ return ret;
+ }
+
+ hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
+ hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
+ hid->product = le16_to_cpu(ihid->hdesc.wProductID);
+
+ hid->initial_quirks |= i2c_hid_get_dmi_quirks(hid->vendor,
+ hid->product);
+
+ snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
+ client->name, (u16)hid->vendor, (u16)hid->product);
+ strscpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
+
+ ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
+
+ return 0;
+}
+
+static int i2c_hid_core_register_hid(struct i2c_hid *ihid)
+{
+ struct i2c_client *client = ihid->client;
+ struct hid_device *hid = ihid->hid;
+ int ret;
+
+ enable_irq(client->irq);
+
+ ret = hid_add_device(hid);
+ if (ret) {
+ if (ret != -ENODEV)
+ hid_err(client, "can't add hid device: %d\n", ret);
+ disable_irq(client->irq);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int i2c_hid_core_probe_panel_follower(struct i2c_hid *ihid)
+{
+ int ret;
+
+ ret = i2c_hid_core_power_up(ihid);
+ if (ret)
+ return ret;
+
+ ret = __i2c_hid_core_probe(ihid);
+ if (ret)
+ goto err_power_down;
+
+ ret = i2c_hid_core_register_hid(ihid);
+ if (ret)
+ goto err_power_down;
+
+ return 0;
+
+err_power_down:
+ i2c_hid_core_power_down(ihid);
+
+ return ret;
+}
+
+static void ihid_core_panel_prepare_work(struct work_struct *work)
+{
+ struct i2c_hid *ihid = container_of(work, struct i2c_hid,
+ panel_follower_prepare_work);
+ struct hid_device *hid = ihid->hid;
+ int ret;
+
+ /*
+ * hid->version is set on the first power up. If it's still zero then
+ * this is the first power on so we should perform initial power up
+ * steps.
+ */
+ if (!hid->version)
+ ret = i2c_hid_core_probe_panel_follower(ihid);
+ else
+ ret = i2c_hid_core_resume(ihid);
+
+ if (ret)
+ dev_warn(&ihid->client->dev, "Power on failed: %d\n", ret);
+ else
+ WRITE_ONCE(ihid->prepare_work_finished, true);
+
+ /*
+ * The work APIs provide a number of memory ordering guarantees
+ * including one that says that memory writes before schedule_work()
+ * are always visible to the work function, but they don't appear to
+ * guarantee that a write that happened in the work is visible after
+ * cancel_work_sync(). We'll add a write memory barrier here to match
+ * with i2c_hid_core_panel_unpreparing() to ensure that our write to
+ * prepare_work_finished is visible there.
+ */
+ smp_wmb();
+}
+
+static int i2c_hid_core_panel_prepared(struct drm_panel_follower *follower)
+{
+ struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
+
+ /*
+ * Powering on a touchscreen can be a slow process. Queue the work to
+ * the system workqueue so we don't block the panel's power up.
+ */
+ WRITE_ONCE(ihid->prepare_work_finished, false);
+ schedule_work(&ihid->panel_follower_prepare_work);
+
+ return 0;
+}
+
+static int i2c_hid_core_panel_unpreparing(struct drm_panel_follower *follower)
+{
+ struct i2c_hid *ihid = container_of(follower, struct i2c_hid, panel_follower);
+
+ cancel_work_sync(&ihid->panel_follower_prepare_work);
+
+ /* Match with ihid_core_panel_prepare_work() */
+ smp_rmb();
+ if (!READ_ONCE(ihid->prepare_work_finished))
+ return 0;
+
+ return i2c_hid_core_suspend(ihid, true);
+}
+
+static const struct drm_panel_follower_funcs i2c_hid_core_panel_follower_funcs = {
+ .panel_prepared = i2c_hid_core_panel_prepared,
+ .panel_unpreparing = i2c_hid_core_panel_unpreparing,
+};
+
+static int i2c_hid_core_register_panel_follower(struct i2c_hid *ihid)
+{
+ struct device *dev = &ihid->client->dev;
+ int ret;
+
+ ihid->panel_follower.funcs = &i2c_hid_core_panel_follower_funcs;
+
+ /*
+ * If we're not in control of our own power up/power down then we can't
+ * do the logic to manage wakeups. Give a warning if a user thought
+ * that was possible then force the capability off.
+ */
+ if (device_can_wakeup(dev)) {
+ dev_warn(dev, "Can't wakeup if following panel\n");
+ device_set_wakeup_capable(dev, false);
+ }
+
+ ret = drm_panel_add_follower(dev, &ihid->panel_follower);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
+ u16 hid_descriptor_address, u32 quirks)
+{
+ int ret;
+ struct i2c_hid *ihid;
+ struct hid_device *hid;
+
+ dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
+
+ if (!client->irq) {
+ dev_err(&client->dev,
+ "HID over i2c has not been provided an Int IRQ\n");
+ return -EINVAL;
+ }
+
+ if (client->irq < 0) {
+ if (client->irq != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "HID over i2c doesn't have a valid IRQ\n");
+ return client->irq;
+ }
+
+ ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
+ if (!ihid)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, ihid);
+
+ ihid->ops = ops;
+ ihid->client = client;
+ ihid->wHIDDescRegister = cpu_to_le16(hid_descriptor_address);
+ ihid->is_panel_follower = drm_is_panel_follower(&client->dev);
+
+ init_waitqueue_head(&ihid->wait);
+ mutex_init(&ihid->reset_lock);
+ INIT_WORK(&ihid->panel_follower_prepare_work, ihid_core_panel_prepare_work);
+
+ /* we need to allocate the command buffer without knowing the maximum
+ * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
+ * real computation later. */
+ ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
+ if (ret < 0)
+ return ret;
+ device_enable_async_suspend(&client->dev);
+
+ hid = hid_allocate_device();
+ if (IS_ERR(hid)) {
+ ret = PTR_ERR(hid);
+ goto err_free_buffers;
+ }
+
+ ihid->hid = hid;
+
+ hid->driver_data = client;
+ hid->ll_driver = &i2c_hid_ll_driver;
+ hid->dev.parent = &client->dev;
+ hid->bus = BUS_I2C;
+ hid->initial_quirks = quirks;
+
+ /* Power on and probe unless device is a panel follower. */
+ if (!ihid->is_panel_follower) {
+ ret = i2c_hid_core_power_up(ihid);
+ if (ret < 0)
+ goto err_destroy_device;
+
+ ret = __i2c_hid_core_probe(ihid);
+ if (ret < 0)
+ goto err_power_down;
+ }
+
+ ret = i2c_hid_init_irq(client);
+ if (ret < 0)
+ goto err_power_down;
+
+ /*
+ * If we're a panel follower, we'll register when the panel turns on;
+ * otherwise we do it right away.
+ */
+ if (ihid->is_panel_follower)
+ ret = i2c_hid_core_register_panel_follower(ihid);
+ else
+ ret = i2c_hid_core_register_hid(ihid);
+ if (ret)
+ goto err_free_irq;
+
+ return 0;
+
+err_free_irq:
+ free_irq(client->irq, ihid);
+err_power_down:
+ if (!ihid->is_panel_follower)
+ i2c_hid_core_power_down(ihid);
+err_destroy_device:
+ hid_destroy_device(hid);
+err_free_buffers:
+ i2c_hid_free_buffers(ihid);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(i2c_hid_core_probe);
+
+void i2c_hid_core_remove(struct i2c_client *client)
+{
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ struct hid_device *hid;
+
+ /*
+ * If we're a follower, the act of unfollowing will cause us to be
+ * powered down. Otherwise we need to manually do it.
+ */
+ if (ihid->is_panel_follower)
+ drm_panel_remove_follower(&ihid->panel_follower);
+ else
+ i2c_hid_core_suspend(ihid, true);
+
+ hid = ihid->hid;
+ hid_destroy_device(hid);
+
+ free_irq(client->irq, ihid);
+
+ if (ihid->bufsize)
+ i2c_hid_free_buffers(ihid);
+}
+EXPORT_SYMBOL_GPL(i2c_hid_core_remove);
+
+void i2c_hid_core_shutdown(struct i2c_client *client)
+{
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
+ free_irq(client->irq, ihid);
+
+ i2c_hid_core_shutdown_tail(ihid);
+}
+EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown);
+
+static int i2c_hid_core_pm_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ if (ihid->is_panel_follower)
+ return 0;
+
+ return i2c_hid_core_suspend(ihid, false);
+}
+
+static int i2c_hid_core_pm_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ if (ihid->is_panel_follower)
+ return 0;
+
+ return i2c_hid_core_resume(ihid);
+}
+
+const struct dev_pm_ops i2c_hid_core_pm = {
+ SYSTEM_SLEEP_PM_OPS(i2c_hid_core_pm_suspend, i2c_hid_core_pm_resume)
+};
+EXPORT_SYMBOL_GPL(i2c_hid_core_pm);
+
+MODULE_DESCRIPTION("HID over I2C core driver");
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c b/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
new file mode 100644
index 0000000000..210f17c3a0
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-dmi-quirks.c
@@ -0,0 +1,494 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Quirks for I2C-HID devices that do not supply proper descriptors
+ *
+ * Copyright (c) 2018 Julian Sax <jsbc@gmx.de>
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/dmi.h>
+#include <linux/mod_devicetable.h>
+#include <linux/hid.h>
+
+#include "i2c-hid.h"
+#include "../hid-ids.h"
+
+
+struct i2c_hid_desc_override {
+ union {
+ struct i2c_hid_desc *i2c_hid_desc;
+ uint8_t *i2c_hid_desc_buffer;
+ };
+ uint8_t *hid_report_desc;
+ unsigned int hid_report_desc_size;
+ uint8_t *i2c_name;
+};
+
+
+/*
+ * descriptors for the SIPODEV SP1064 touchpad
+ *
+ * This device does not supply any descriptors and on windows a filter
+ * driver operates between the i2c-hid layer and the device and injects
+ * these descriptors when the device is prompted. The descriptors were
+ * extracted by listening to the i2c-hid traffic that occurs between the
+ * windows filter driver and the windows i2c-hid driver.
+ */
+
+static const struct i2c_hid_desc_override sipodev_desc = {
+ .i2c_hid_desc_buffer = (uint8_t [])
+ {0x1e, 0x00, /* Length of descriptor */
+ 0x00, 0x01, /* Version of descriptor */
+ 0xdb, 0x01, /* Length of report descriptor */
+ 0x21, 0x00, /* Location of report descriptor */
+ 0x24, 0x00, /* Location of input report */
+ 0x1b, 0x00, /* Max input report length */
+ 0x25, 0x00, /* Location of output report */
+ 0x11, 0x00, /* Max output report length */
+ 0x22, 0x00, /* Location of command register */
+ 0x23, 0x00, /* Location of data register */
+ 0x11, 0x09, /* Vendor ID */
+ 0x88, 0x52, /* Product ID */
+ 0x06, 0x00, /* Version ID */
+ 0x00, 0x00, 0x00, 0x00 /* Reserved */
+ },
+
+ .hid_report_desc = (uint8_t [])
+ {0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x02, /* Usage (Mouse), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x01, /* Report ID (1), */
+ 0x09, 0x01, /* Usage (Pointer), */
+ 0xA1, 0x00, /* Collection (Physical), */
+ 0x05, 0x09, /* Usage Page (Button), */
+ 0x19, 0x01, /* Usage Minimum (01h), */
+ 0x29, 0x02, /* Usage Maximum (02h), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x06, /* Report Count (6), */
+ 0x81, 0x01, /* Input (Constant), */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x15, 0x81, /* Logical Minimum (-127), */
+ 0x25, 0x7F, /* Logical Maximum (127), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x81, 0x06, /* Input (Variable, Relative), */
+ 0xC0, /* End Collection, */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x05, /* Usage (Touchpad), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x04, /* Report ID (4), */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x02, /* Collection (Logical), */
+ 0x15, 0x00, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x09, 0x47, /* Usage (Touch Valid), */
+ 0x09, 0x42, /* Usage (Tip Switch), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x03, /* Report Size (3), */
+ 0x25, 0x05, /* Logical Maximum (5), */
+ 0x09, 0x51, /* Usage (Contact Identifier), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x55, 0x0E, /* Unit Exponent (14), */
+ 0x65, 0x11, /* Unit (Centimeter), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x46, 0xBC, 0x02, /* Physical Maximum (700), */
+ 0x26, 0x34, 0x05, /* Logical Maximum (1332), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x02, /* Collection (Logical), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x09, 0x47, /* Usage (Touch Valid), */
+ 0x09, 0x42, /* Usage (Tip Switch), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x03, /* Report Size (3), */
+ 0x25, 0x05, /* Logical Maximum (5), */
+ 0x09, 0x51, /* Usage (Contact Identifier), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x46, 0xBC, 0x02, /* Physical Maximum (700), */
+ 0x26, 0x34, 0x05, /* Logical Maximum (1332), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x02, /* Collection (Logical), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x09, 0x47, /* Usage (Touch Valid), */
+ 0x09, 0x42, /* Usage (Tip Switch), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x03, /* Report Size (3), */
+ 0x25, 0x05, /* Logical Maximum (5), */
+ 0x09, 0x51, /* Usage (Contact Identifier), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x46, 0xBC, 0x02, /* Physical Maximum (700), */
+ 0x26, 0x34, 0x05, /* Logical Maximum (1332), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x02, /* Collection (Logical), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x09, 0x47, /* Usage (Touch Valid), */
+ 0x09, 0x42, /* Usage (Tip Switch), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x75, 0x03, /* Report Size (3), */
+ 0x25, 0x05, /* Logical Maximum (5), */
+ 0x09, 0x51, /* Usage (Contact Identifier), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x26, 0x44, 0x0A, /* Logical Maximum (2628), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x46, 0x1A, 0x04, /* Physical Maximum (1050), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x46, 0xBC, 0x02, /* Physical Maximum (700), */
+ 0x26, 0x34, 0x05, /* Logical Maximum (1332), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x55, 0x0C, /* Unit Exponent (12), */
+ 0x66, 0x01, 0x10, /* Unit (Seconds), */
+ 0x47, 0xFF, 0xFF, 0x00, 0x00,/* Physical Maximum (65535), */
+ 0x27, 0xFF, 0xFF, 0x00, 0x00,/* Logical Maximum (65535), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x09, 0x56, /* Usage (Scan Time), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x09, 0x54, /* Usage (Contact Count), */
+ 0x25, 0x7F, /* Logical Maximum (127), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x05, 0x09, /* Usage Page (Button), */
+ 0x09, 0x01, /* Usage (01h), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x07, /* Report Count (7), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x85, 0x02, /* Report ID (2), */
+ 0x09, 0x55, /* Usage (Contact Count Maximum), */
+ 0x09, 0x59, /* Usage (59h), */
+ 0x75, 0x04, /* Report Size (4), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x25, 0x0F, /* Logical Maximum (15), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x85, 0x07, /* Report ID (7), */
+ 0x09, 0x60, /* Usage (60h), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0x95, 0x07, /* Report Count (7), */
+ 0xB1, 0x03, /* Feature (Constant, Variable), */
+ 0x85, 0x06, /* Report ID (6), */
+ 0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
+ 0x09, 0xC5, /* Usage (C5h), */
+ 0x26, 0xFF, 0x00, /* Logical Maximum (255), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x96, 0x00, 0x01, /* Report Count (256), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0xC0, /* End Collection, */
+ 0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
+ 0x09, 0x01, /* Usage (01h), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x0D, /* Report ID (13), */
+ 0x26, 0xFF, 0x00, /* Logical Maximum (255), */
+ 0x19, 0x01, /* Usage Minimum (01h), */
+ 0x29, 0x02, /* Usage Maximum (02h), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x0E, /* Usage (Configuration), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x03, /* Report ID (3), */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x02, /* Collection (Logical), */
+ 0x09, 0x52, /* Usage (Device Mode), */
+ 0x25, 0x0A, /* Logical Maximum (10), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0xC0, /* End Collection, */
+ 0x09, 0x22, /* Usage (Finger), */
+ 0xA1, 0x00, /* Collection (Physical), */
+ 0x85, 0x05, /* Report ID (5), */
+ 0x09, 0x57, /* Usage (57h), */
+ 0x09, 0x58, /* Usage (58h), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0xB1, 0x02, /* Feature (Variable), */
+ 0x95, 0x06, /* Report Count (6), */
+ 0xB1, 0x03, /* Feature (Constant, Variable),*/
+ 0xC0, /* End Collection, */
+ 0xC0 /* End Collection */
+ },
+ .hid_report_desc_size = 475,
+ .i2c_name = "SYNA3602:00"
+};
+
+
+static const struct dmi_system_id i2c_hid_dmi_desc_override_table[] = {
+ {
+ .ident = "Teclast F6 Pro",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F6 Pro"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Teclast F7",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TECLAST"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "F7"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Trekstor Primebook C13",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C13"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Trekstor Primebook C11",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ /*
+ * There are at least 2 Primebook C11B versions, the older
+ * version has a product-name of "Primebook C11B", and a
+ * bios version / release / firmware revision of:
+ * V2.1.2 / 05/03/2018 / 18.2
+ * The new version has "PRIMEBOOK C11B" as product-name and a
+ * bios version / release / firmware revision of:
+ * CFALKSW05_BIOS_V1.1.2 / 11/19/2018 / 19.2
+ * Only the older version needs this quirk, note the newer
+ * version will not match as it has a different product-name.
+ */
+ .ident = "Trekstor Primebook C11B",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Primebook C11B"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Trekstor SURFBOOK E11B",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "TREKSTOR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SURFBOOK E11B"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Direkt-Tek DTLAPY116-2",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY116-2"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Direkt-Tek DTLAPY133-1",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Direkt-Tek"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "DTLAPY133-1"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Mediacom Flexbook Edge 11",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook edge11 - M-FBE11"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Mediacom FlexBook edge 13",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MEDIACOM"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "FlexBook_edge13-M-FBE13"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Odys Winbook 13",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "AXDIA International GmbH"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "WINBOOK 13"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "iBall Aer3",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "iBall"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Aer3"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Schneider SCL142ALM",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "SCHNEIDER"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "SCL142ALM"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ {
+ .ident = "Vero K147",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "VERO"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "K147"),
+ },
+ .driver_data = (void *)&sipodev_desc
+ },
+ { } /* Terminate list */
+};
+
+static const struct hid_device_id i2c_hid_elan_flipped_quirks = {
+ HID_DEVICE(BUS_I2C, HID_GROUP_MULTITOUCH_WIN_8, USB_VENDOR_ID_ELAN, 0x2dcd),
+ HID_QUIRK_X_INVERT | HID_QUIRK_Y_INVERT
+};
+
+/*
+ * This list contains devices which have specific issues based on the system
+ * they're on and not just the device itself. The driver_data will have a
+ * specific hid device to match against.
+ */
+static const struct dmi_system_id i2c_hid_dmi_quirk_table[] = {
+ {
+ .ident = "DynaBook K50/FR",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Dynabook Inc."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "dynabook K50/FR"),
+ },
+ .driver_data = (void *)&i2c_hid_elan_flipped_quirks,
+ },
+ { } /* Terminate list */
+};
+
+
+struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
+{
+ struct i2c_hid_desc_override *override;
+ const struct dmi_system_id *system_id;
+
+ system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
+ if (!system_id)
+ return NULL;
+
+ override = system_id->driver_data;
+ if (strcmp(override->i2c_name, i2c_name))
+ return NULL;
+
+ return override->i2c_hid_desc;
+}
+
+char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
+ unsigned int *size)
+{
+ struct i2c_hid_desc_override *override;
+ const struct dmi_system_id *system_id;
+
+ system_id = dmi_first_match(i2c_hid_dmi_desc_override_table);
+ if (!system_id)
+ return NULL;
+
+ override = system_id->driver_data;
+ if (strcmp(override->i2c_name, i2c_name))
+ return NULL;
+
+ *size = override->hid_report_desc_size;
+ return override->hid_report_desc;
+}
+
+u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
+{
+ u32 quirks = 0;
+ const struct dmi_system_id *system_id =
+ dmi_first_match(i2c_hid_dmi_quirk_table);
+
+ if (system_id) {
+ const struct hid_device_id *device_id =
+ (struct hid_device_id *)(system_id->driver_data);
+
+ if (device_id && device_id->vendor == vendor &&
+ device_id->product == product)
+ quirks = device_id->driver_data;
+ }
+
+ return quirks;
+}
diff --git a/drivers/hid/i2c-hid/i2c-hid-of-elan.c b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
new file mode 100644
index 0000000000..31abab57ad
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Elan touchscreens that use the i2c-hid protocol.
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include "i2c-hid.h"
+
+struct elan_i2c_hid_chip_data {
+ unsigned int post_gpio_reset_on_delay_ms;
+ unsigned int post_gpio_reset_off_delay_ms;
+ unsigned int post_power_delay_ms;
+ u16 hid_descriptor_address;
+ const char *main_supply_name;
+};
+
+struct i2c_hid_of_elan {
+ struct i2chid_ops ops;
+
+ struct regulator *vcc33;
+ struct regulator *vccio;
+ struct gpio_desc *reset_gpio;
+ const struct elan_i2c_hid_chip_data *chip_data;
+};
+
+static int elan_i2c_hid_power_up(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of_elan *ihid_elan =
+ container_of(ops, struct i2c_hid_of_elan, ops);
+ int ret;
+
+ if (ihid_elan->vcc33) {
+ ret = regulator_enable(ihid_elan->vcc33);
+ if (ret)
+ return ret;
+ }
+
+ ret = regulator_enable(ihid_elan->vccio);
+ if (ret) {
+ regulator_disable(ihid_elan->vcc33);
+ return ret;
+ }
+
+ if (ihid_elan->chip_data->post_power_delay_ms)
+ msleep(ihid_elan->chip_data->post_power_delay_ms);
+
+ gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);
+ if (ihid_elan->chip_data->post_gpio_reset_on_delay_ms)
+ msleep(ihid_elan->chip_data->post_gpio_reset_on_delay_ms);
+
+ return 0;
+}
+
+static void elan_i2c_hid_power_down(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of_elan *ihid_elan =
+ container_of(ops, struct i2c_hid_of_elan, ops);
+
+ gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);
+ if (ihid_elan->chip_data->post_gpio_reset_off_delay_ms)
+ msleep(ihid_elan->chip_data->post_gpio_reset_off_delay_ms);
+
+ regulator_disable(ihid_elan->vccio);
+ if (ihid_elan->vcc33)
+ regulator_disable(ihid_elan->vcc33);
+}
+
+static int i2c_hid_of_elan_probe(struct i2c_client *client)
+{
+ struct i2c_hid_of_elan *ihid_elan;
+
+ ihid_elan = devm_kzalloc(&client->dev, sizeof(*ihid_elan), GFP_KERNEL);
+ if (!ihid_elan)
+ return -ENOMEM;
+
+ ihid_elan->ops.power_up = elan_i2c_hid_power_up;
+ ihid_elan->ops.power_down = elan_i2c_hid_power_down;
+
+ /* Start out with reset asserted */
+ ihid_elan->reset_gpio =
+ devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ihid_elan->reset_gpio))
+ return PTR_ERR(ihid_elan->reset_gpio);
+
+ ihid_elan->vccio = devm_regulator_get(&client->dev, "vccio");
+ if (IS_ERR(ihid_elan->vccio))
+ return PTR_ERR(ihid_elan->vccio);
+
+ ihid_elan->chip_data = device_get_match_data(&client->dev);
+
+ if (ihid_elan->chip_data->main_supply_name) {
+ ihid_elan->vcc33 = devm_regulator_get(&client->dev,
+ ihid_elan->chip_data->main_supply_name);
+ if (IS_ERR(ihid_elan->vcc33))
+ return PTR_ERR(ihid_elan->vcc33);
+ }
+
+ return i2c_hid_core_probe(client, &ihid_elan->ops,
+ ihid_elan->chip_data->hid_descriptor_address, 0);
+}
+
+static const struct elan_i2c_hid_chip_data elan_ekth6915_chip_data = {
+ .post_power_delay_ms = 1,
+ .post_gpio_reset_on_delay_ms = 300,
+ .hid_descriptor_address = 0x0001,
+ .main_supply_name = "vcc33",
+};
+
+static const struct elan_i2c_hid_chip_data ilitek_ili9882t_chip_data = {
+ .post_power_delay_ms = 1,
+ .post_gpio_reset_on_delay_ms = 200,
+ .post_gpio_reset_off_delay_ms = 65,
+ .hid_descriptor_address = 0x0001,
+ /*
+ * this touchscreen is tightly integrated with the panel and assumes
+ * that the relevant power rails (other than the IO rail) have already
+ * been turned on by the panel driver because we're a panel follower.
+ */
+ .main_supply_name = NULL,
+};
+
+static const struct of_device_id elan_i2c_hid_of_match[] = {
+ { .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
+ { .compatible = "ilitek,ili9882t", .data = &ilitek_ili9882t_chip_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);
+
+static struct i2c_driver elan_i2c_hid_ts_driver = {
+ .driver = {
+ .name = "i2c_hid_of_elan",
+ .pm = &i2c_hid_core_pm,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .of_match_table = of_match_ptr(elan_i2c_hid_of_match),
+ },
+ .probe = i2c_hid_of_elan_probe,
+ .remove = i2c_hid_core_remove,
+ .shutdown = i2c_hid_core_shutdown,
+};
+module_i2c_driver(elan_i2c_hid_ts_driver);
+
+MODULE_AUTHOR("Douglas Anderson <dianders@chromium.org>");
+MODULE_DESCRIPTION("Elan i2c-hid touchscreen driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid-of-goodix.c b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c
new file mode 100644
index 0000000000..f1597ad67e
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Goodix touchscreens that use the i2c-hid protocol.
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include "i2c-hid.h"
+
+struct goodix_i2c_hid_timing_data {
+ unsigned int post_gpio_reset_delay_ms;
+ unsigned int post_power_delay_ms;
+};
+
+struct i2c_hid_of_goodix {
+ struct i2chid_ops ops;
+
+ struct regulator *vdd;
+ struct regulator *vddio;
+ struct gpio_desc *reset_gpio;
+ bool no_reset_during_suspend;
+ const struct goodix_i2c_hid_timing_data *timings;
+};
+
+static int goodix_i2c_hid_power_up(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of_goodix *ihid_goodix =
+ container_of(ops, struct i2c_hid_of_goodix, ops);
+ int ret;
+
+ /*
+ * We assert reset GPIO here (instead of during power-down) to ensure
+ * the device will have a clean state after powering up, just like the
+ * normal scenarios will have.
+ */
+ if (ihid_goodix->no_reset_during_suspend)
+ gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
+
+ ret = regulator_enable(ihid_goodix->vdd);
+ if (ret)
+ return ret;
+
+ ret = regulator_enable(ihid_goodix->vddio);
+ if (ret)
+ return ret;
+
+ if (ihid_goodix->timings->post_power_delay_ms)
+ msleep(ihid_goodix->timings->post_power_delay_ms);
+
+ gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 0);
+ if (ihid_goodix->timings->post_gpio_reset_delay_ms)
+ msleep(ihid_goodix->timings->post_gpio_reset_delay_ms);
+
+ return 0;
+}
+
+static void goodix_i2c_hid_power_down(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of_goodix *ihid_goodix =
+ container_of(ops, struct i2c_hid_of_goodix, ops);
+
+ if (!ihid_goodix->no_reset_during_suspend)
+ gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
+
+ regulator_disable(ihid_goodix->vddio);
+ regulator_disable(ihid_goodix->vdd);
+}
+
+static int i2c_hid_of_goodix_probe(struct i2c_client *client)
+{
+ struct i2c_hid_of_goodix *ihid_goodix;
+
+ ihid_goodix = devm_kzalloc(&client->dev, sizeof(*ihid_goodix),
+ GFP_KERNEL);
+ if (!ihid_goodix)
+ return -ENOMEM;
+
+ ihid_goodix->ops.power_up = goodix_i2c_hid_power_up;
+ ihid_goodix->ops.power_down = goodix_i2c_hid_power_down;
+
+ /* Start out with reset asserted */
+ ihid_goodix->reset_gpio =
+ devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ihid_goodix->reset_gpio))
+ return PTR_ERR(ihid_goodix->reset_gpio);
+
+ ihid_goodix->vdd = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(ihid_goodix->vdd))
+ return PTR_ERR(ihid_goodix->vdd);
+
+ ihid_goodix->vddio = devm_regulator_get(&client->dev, "mainboard-vddio");
+ if (IS_ERR(ihid_goodix->vddio))
+ return PTR_ERR(ihid_goodix->vddio);
+
+ ihid_goodix->no_reset_during_suspend =
+ of_property_read_bool(client->dev.of_node, "goodix,no-reset-during-suspend");
+
+ ihid_goodix->timings = device_get_match_data(&client->dev);
+
+ return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);
+}
+
+static const struct goodix_i2c_hid_timing_data goodix_gt7375p_timing_data = {
+ .post_power_delay_ms = 10,
+ .post_gpio_reset_delay_ms = 180,
+};
+
+static const struct of_device_id goodix_i2c_hid_of_match[] = {
+ { .compatible = "goodix,gt7375p", .data = &goodix_gt7375p_timing_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, goodix_i2c_hid_of_match);
+
+static struct i2c_driver goodix_i2c_hid_ts_driver = {
+ .driver = {
+ .name = "i2c_hid_of_goodix",
+ .pm = &i2c_hid_core_pm,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .of_match_table = of_match_ptr(goodix_i2c_hid_of_match),
+ },
+ .probe = i2c_hid_of_goodix_probe,
+ .remove = i2c_hid_core_remove,
+ .shutdown = i2c_hid_core_shutdown,
+};
+module_i2c_driver(goodix_i2c_hid_ts_driver);
+
+MODULE_AUTHOR("Douglas Anderson <dianders@chromium.org>");
+MODULE_DESCRIPTION("Goodix i2c-hid touchscreen driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hid/i2c-hid/i2c-hid-of.c b/drivers/hid/i2c-hid/i2c-hid-of.c
new file mode 100644
index 0000000000..c4e1fa0273
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid-of.c
@@ -0,0 +1,170 @@
+/*
+ * HID over I2C Open Firmware Subclass
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2012 Red Hat, Inc
+ *
+ * This code was forked out of the core code, which was partly based on
+ * "USB HID support for Linux":
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ * Copyright (c) 2007-2008 Oliver Neukum
+ * Copyright (c) 2006-2010 Jiri Kosina
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/hid.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+
+#include "i2c-hid.h"
+
+struct i2c_hid_of {
+ struct i2chid_ops ops;
+
+ struct i2c_client *client;
+ struct gpio_desc *reset_gpio;
+ struct regulator_bulk_data supplies[2];
+ int post_power_delay_ms;
+ int post_reset_delay_ms;
+};
+
+static int i2c_hid_of_power_up(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
+ struct device *dev = &ihid_of->client->dev;
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
+ ihid_of->supplies);
+ if (ret) {
+ dev_warn(dev, "Failed to enable supplies: %d\n", ret);
+ return ret;
+ }
+
+ if (ihid_of->post_power_delay_ms)
+ msleep(ihid_of->post_power_delay_ms);
+
+ gpiod_set_value_cansleep(ihid_of->reset_gpio, 0);
+ if (ihid_of->post_reset_delay_ms)
+ msleep(ihid_of->post_reset_delay_ms);
+
+ return 0;
+}
+
+static void i2c_hid_of_power_down(struct i2chid_ops *ops)
+{
+ struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
+
+ gpiod_set_value_cansleep(ihid_of->reset_gpio, 1);
+ regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
+ ihid_of->supplies);
+}
+
+static int i2c_hid_of_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct i2c_hid_of *ihid_of;
+ u16 hid_descriptor_address;
+ u32 quirks = 0;
+ int ret;
+ u32 val;
+
+ ihid_of = devm_kzalloc(dev, sizeof(*ihid_of), GFP_KERNEL);
+ if (!ihid_of)
+ return -ENOMEM;
+
+ ihid_of->ops.power_up = i2c_hid_of_power_up;
+ ihid_of->ops.power_down = i2c_hid_of_power_down;
+
+ ret = device_property_read_u32(dev, "hid-descr-addr", &val);
+ if (ret) {
+ dev_err(dev, "HID register address not provided\n");
+ return -ENODEV;
+ }
+ if (val >> 16) {
+ dev_err(dev, "Bad HID register address: 0x%08x\n", val);
+ return -EINVAL;
+ }
+ hid_descriptor_address = val;
+
+ if (!device_property_read_u32(dev, "post-power-on-delay-ms", &val))
+ ihid_of->post_power_delay_ms = val;
+
+ /*
+ * Note this is a kernel internal device-property set by x86 platform code,
+ * this MUST not be used in devicetree files without first adding it to
+ * the DT bindings.
+ */
+ if (!device_property_read_u32(dev, "post-reset-deassert-delay-ms", &val))
+ ihid_of->post_reset_delay_ms = val;
+
+ /* Start out with reset asserted */
+ ihid_of->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(ihid_of->reset_gpio))
+ return PTR_ERR(ihid_of->reset_gpio);
+
+ ihid_of->supplies[0].supply = "vdd";
+ ihid_of->supplies[1].supply = "vddl";
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ihid_of->supplies),
+ ihid_of->supplies);
+ if (ret)
+ return ret;
+
+ if (device_property_read_bool(dev, "touchscreen-inverted-x"))
+ quirks |= HID_QUIRK_X_INVERT;
+
+ if (device_property_read_bool(dev, "touchscreen-inverted-y"))
+ quirks |= HID_QUIRK_Y_INVERT;
+
+ return i2c_hid_core_probe(client, &ihid_of->ops,
+ hid_descriptor_address, quirks);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id i2c_hid_of_match[] = {
+ { .compatible = "hid-over-i2c" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
+#endif
+
+static const struct i2c_device_id i2c_hid_of_id_table[] = {
+ { "hid", 0 },
+ { "hid-over-i2c", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
+
+static struct i2c_driver i2c_hid_of_driver = {
+ .driver = {
+ .name = "i2c_hid_of",
+ .pm = &i2c_hid_core_pm,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .of_match_table = of_match_ptr(i2c_hid_of_match),
+ },
+
+ .probe = i2c_hid_of_probe,
+ .remove = i2c_hid_core_remove,
+ .shutdown = i2c_hid_core_shutdown,
+ .id_table = i2c_hid_of_id_table,
+};
+
+module_i2c_driver(i2c_hid_of_driver);
+
+MODULE_DESCRIPTION("HID over I2C OF driver");
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/i2c-hid/i2c-hid.h b/drivers/hid/i2c-hid/i2c-hid.h
new file mode 100644
index 0000000000..2c7b66d5ca
--- /dev/null
+++ b/drivers/hid/i2c-hid/i2c-hid.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef I2C_HID_H
+#define I2C_HID_H
+
+#include <linux/i2c.h>
+
+#ifdef CONFIG_DMI
+struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
+char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
+ unsigned int *size);
+u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product);
+#else
+static inline struct i2c_hid_desc
+ *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
+{ return NULL; }
+static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
+ unsigned int *size)
+{ return NULL; }
+static inline u32 i2c_hid_get_dmi_quirks(const u16 vendor, const u16 product)
+{ return 0; }
+#endif
+
+/**
+ * struct i2chid_ops - Ops provided to the core.
+ *
+ * @power_up: do sequencing to power up the device.
+ * @power_down: do sequencing to power down the device.
+ * @shutdown_tail: called at the end of shutdown.
+ */
+struct i2chid_ops {
+ int (*power_up)(struct i2chid_ops *ops);
+ void (*power_down)(struct i2chid_ops *ops);
+ void (*shutdown_tail)(struct i2chid_ops *ops);
+};
+
+int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
+ u16 hid_descriptor_address, u32 quirks);
+void i2c_hid_core_remove(struct i2c_client *client);
+
+void i2c_hid_core_shutdown(struct i2c_client *client);
+
+extern const struct dev_pm_ops i2c_hid_core_pm;
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 06:30:41 +0000