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-rw-r--r--drivers/input/touchscreen/silead.c842
1 files changed, 842 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
new file mode 100644
index 000000000..3eef8c010
--- /dev/null
+++ b/drivers/input/touchscreen/silead.c
@@ -0,0 +1,842 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* -------------------------------------------------------------------------
+ * Copyright (C) 2014-2015, Intel Corporation
+ *
+ * Derived from:
+ * gslX68X.c
+ * Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/irq.h>
+#include <linux/regulator/consumer.h>
+
+#include <asm/unaligned.h>
+
+#define SILEAD_TS_NAME "silead_ts"
+
+#define SILEAD_REG_RESET 0xE0
+#define SILEAD_REG_DATA 0x80
+#define SILEAD_REG_TOUCH_NR 0x80
+#define SILEAD_REG_POWER 0xBC
+#define SILEAD_REG_CLOCK 0xE4
+#define SILEAD_REG_STATUS 0xB0
+#define SILEAD_REG_ID 0xFC
+#define SILEAD_REG_MEM_CHECK 0xB0
+
+#define SILEAD_STATUS_OK 0x5A5A5A5A
+#define SILEAD_TS_DATA_LEN 44
+#define SILEAD_CLOCK 0x04
+
+#define SILEAD_CMD_RESET 0x88
+#define SILEAD_CMD_START 0x00
+
+#define SILEAD_POINT_DATA_LEN 0x04
+#define SILEAD_POINT_Y_OFF 0x00
+#define SILEAD_POINT_Y_MSB_OFF 0x01
+#define SILEAD_POINT_X_OFF 0x02
+#define SILEAD_POINT_X_MSB_OFF 0x03
+#define SILEAD_EXTRA_DATA_MASK 0xF0
+
+#define SILEAD_CMD_SLEEP_MIN 10000
+#define SILEAD_CMD_SLEEP_MAX 20000
+#define SILEAD_POWER_SLEEP 20
+#define SILEAD_STARTUP_SLEEP 30
+
+#define SILEAD_MAX_FINGERS 10
+
+enum silead_ts_power {
+ SILEAD_POWER_ON = 1,
+ SILEAD_POWER_OFF = 0
+};
+
+struct silead_ts_data {
+ struct i2c_client *client;
+ struct gpio_desc *gpio_power;
+ struct input_dev *input;
+ struct input_dev *pen_input;
+ struct regulator_bulk_data regulators[2];
+ char fw_name[64];
+ struct touchscreen_properties prop;
+ u32 max_fingers;
+ u32 chip_id;
+ struct input_mt_pos pos[SILEAD_MAX_FINGERS];
+ int slots[SILEAD_MAX_FINGERS];
+ int id[SILEAD_MAX_FINGERS];
+ u32 efi_fw_min_max[4];
+ bool efi_fw_min_max_set;
+ bool pen_supported;
+ bool pen_down;
+ u32 pen_x_res;
+ u32 pen_y_res;
+ int pen_up_count;
+};
+
+struct silead_fw_data {
+ u32 offset;
+ u32 val;
+};
+
+static void silead_apply_efi_fw_min_max(struct silead_ts_data *data)
+{
+ struct input_absinfo *absinfo_x = &data->input->absinfo[ABS_MT_POSITION_X];
+ struct input_absinfo *absinfo_y = &data->input->absinfo[ABS_MT_POSITION_Y];
+
+ if (!data->efi_fw_min_max_set)
+ return;
+
+ absinfo_x->minimum = data->efi_fw_min_max[0];
+ absinfo_x->maximum = data->efi_fw_min_max[1];
+ absinfo_y->minimum = data->efi_fw_min_max[2];
+ absinfo_y->maximum = data->efi_fw_min_max[3];
+
+ if (data->prop.invert_x) {
+ absinfo_x->maximum -= absinfo_x->minimum;
+ absinfo_x->minimum = 0;
+ }
+
+ if (data->prop.invert_y) {
+ absinfo_y->maximum -= absinfo_y->minimum;
+ absinfo_y->minimum = 0;
+ }
+
+ if (data->prop.swap_x_y) {
+ swap(absinfo_x->minimum, absinfo_y->minimum);
+ swap(absinfo_x->maximum, absinfo_y->maximum);
+ }
+}
+
+static int silead_ts_request_input_dev(struct silead_ts_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int error;
+
+ data->input = devm_input_allocate_device(dev);
+ if (!data->input) {
+ dev_err(dev,
+ "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
+ input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
+ touchscreen_parse_properties(data->input, true, &data->prop);
+ silead_apply_efi_fw_min_max(data);
+
+ input_mt_init_slots(data->input, data->max_fingers,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
+ INPUT_MT_TRACK);
+
+ if (device_property_read_bool(dev, "silead,home-button"))
+ input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
+
+ data->input->name = SILEAD_TS_NAME;
+ data->input->phys = "input/ts";
+ data->input->id.bustype = BUS_I2C;
+
+ error = input_register_device(data->input);
+ if (error) {
+ dev_err(dev, "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int silead_ts_request_pen_input_dev(struct silead_ts_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int error;
+
+ if (!data->pen_supported)
+ return 0;
+
+ data->pen_input = devm_input_allocate_device(dev);
+ if (!data->pen_input)
+ return -ENOMEM;
+
+ input_set_abs_params(data->pen_input, ABS_X, 0, 4095, 0, 0);
+ input_set_abs_params(data->pen_input, ABS_Y, 0, 4095, 0, 0);
+ input_set_capability(data->pen_input, EV_KEY, BTN_TOUCH);
+ input_set_capability(data->pen_input, EV_KEY, BTN_TOOL_PEN);
+ set_bit(INPUT_PROP_DIRECT, data->pen_input->propbit);
+ touchscreen_parse_properties(data->pen_input, false, &data->prop);
+ input_abs_set_res(data->pen_input, ABS_X, data->pen_x_res);
+ input_abs_set_res(data->pen_input, ABS_Y, data->pen_y_res);
+
+ data->pen_input->name = SILEAD_TS_NAME " pen";
+ data->pen_input->phys = "input/pen";
+ data->input->id.bustype = BUS_I2C;
+
+ error = input_register_device(data->pen_input);
+ if (error) {
+ dev_err(dev, "Failed to register pen input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void silead_ts_set_power(struct i2c_client *client,
+ enum silead_ts_power state)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+
+ if (data->gpio_power) {
+ gpiod_set_value_cansleep(data->gpio_power, state);
+ msleep(SILEAD_POWER_SLEEP);
+ }
+}
+
+static bool silead_ts_handle_pen_data(struct silead_ts_data *data, u8 *buf)
+{
+ u8 *coord = buf + SILEAD_POINT_DATA_LEN;
+ struct input_mt_pos pos;
+
+ if (!data->pen_supported || buf[2] != 0x00 || buf[3] != 0x00)
+ return false;
+
+ if (buf[0] == 0x00 && buf[1] == 0x00 && data->pen_down) {
+ data->pen_up_count++;
+ if (data->pen_up_count == 6) {
+ data->pen_down = false;
+ goto sync;
+ }
+ return true;
+ }
+
+ if (buf[0] == 0x01 && buf[1] == 0x08) {
+ touchscreen_set_mt_pos(&pos, &data->prop,
+ get_unaligned_le16(&coord[SILEAD_POINT_X_OFF]) & 0xfff,
+ get_unaligned_le16(&coord[SILEAD_POINT_Y_OFF]) & 0xfff);
+
+ input_report_abs(data->pen_input, ABS_X, pos.x);
+ input_report_abs(data->pen_input, ABS_Y, pos.y);
+
+ data->pen_up_count = 0;
+ data->pen_down = true;
+ goto sync;
+ }
+
+ return false;
+
+sync:
+ input_report_key(data->pen_input, BTN_TOOL_PEN, data->pen_down);
+ input_report_key(data->pen_input, BTN_TOUCH, data->pen_down);
+ input_sync(data->pen_input);
+ return true;
+}
+
+static void silead_ts_read_data(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct input_dev *input = data->input;
+ struct device *dev = &client->dev;
+ u8 *bufp, buf[SILEAD_TS_DATA_LEN];
+ int touch_nr, softbutton, error, i;
+ bool softbutton_pressed = false;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
+ SILEAD_TS_DATA_LEN, buf);
+ if (error < 0) {
+ dev_err(dev, "Data read error %d\n", error);
+ return;
+ }
+
+ if (buf[0] > data->max_fingers) {
+ dev_warn(dev, "More touches reported then supported %d > %d\n",
+ buf[0], data->max_fingers);
+ buf[0] = data->max_fingers;
+ }
+
+ if (silead_ts_handle_pen_data(data, buf))
+ goto sync; /* Pen is down, release all previous touches */
+
+ touch_nr = 0;
+ bufp = buf + SILEAD_POINT_DATA_LEN;
+ for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
+ softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
+ SILEAD_EXTRA_DATA_MASK) >> 4;
+
+ if (softbutton) {
+ /*
+ * For now only respond to softbutton == 0x01, some
+ * tablets *without* a capacative button send 0x04
+ * when crossing the edges of the screen.
+ */
+ if (softbutton == 0x01)
+ softbutton_pressed = true;
+
+ continue;
+ }
+
+ /*
+ * Bits 4-7 are the touch id, note not all models have
+ * hardware touch ids so atm we don't use these.
+ */
+ data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
+ SILEAD_EXTRA_DATA_MASK) >> 4;
+ touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
+ get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
+ get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
+ touch_nr++;
+ }
+
+ input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
+
+ for (i = 0; i < touch_nr; i++) {
+ input_mt_slot(input, data->slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
+ input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
+
+ dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
+ data->pos[i].y, data->id[i], data->slots[i]);
+ }
+
+sync:
+ input_mt_sync_frame(input);
+ input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
+ input_sync(input);
+}
+
+static int silead_ts_init(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
+ data->max_fingers);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
+ SILEAD_CLOCK);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_START);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ return 0;
+
+i2c_write_err:
+ dev_err(&client->dev, "Registers clear error %d\n", error);
+ return error;
+}
+
+static int silead_ts_reset(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
+ SILEAD_CLOCK);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
+ SILEAD_CMD_START);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ return 0;
+
+i2c_write_err:
+ dev_err(&client->dev, "Chip reset error %d\n", error);
+ return error;
+}
+
+static int silead_ts_startup(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
+ if (error) {
+ dev_err(&client->dev, "Startup error %d\n", error);
+ return error;
+ }
+
+ msleep(SILEAD_STARTUP_SLEEP);
+
+ return 0;
+}
+
+static int silead_ts_load_fw(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ const struct firmware *fw = NULL;
+ struct silead_fw_data *fw_data;
+ unsigned int fw_size, i;
+ int error;
+
+ dev_dbg(dev, "Firmware file name: %s", data->fw_name);
+
+ /*
+ * Unfortunately, at the time of writing this comment, we have been unable to
+ * get permission from Silead, or from device OEMs, to distribute the necessary
+ * Silead firmware files in linux-firmware.
+ *
+ * On a whole bunch of devices the UEFI BIOS code contains a touchscreen driver,
+ * which contains an embedded copy of the firmware. The fw-loader code has a
+ * "platform" fallback mechanism, which together with info on the firmware
+ * from drivers/platform/x86/touchscreen_dmi.c will use the firmware from the
+ * UEFI driver when the firmware is missing from /lib/firmware. This makes the
+ * touchscreen work OOTB without users needing to manually download the firmware.
+ *
+ * The firmware bundled with the original Windows/Android is usually newer then
+ * the firmware in the UEFI driver and it is better calibrated. This better
+ * calibration can lead to significant differences in the reported min/max
+ * coordinates.
+ *
+ * To deal with this we first try to load the firmware without "platform"
+ * fallback. If that fails we retry with "platform" fallback and if that
+ * succeeds we apply an (optional) set of alternative min/max values from the
+ * "silead,efi-fw-min-max" property.
+ */
+ error = firmware_request_nowarn(&fw, data->fw_name, dev);
+ if (error) {
+ error = firmware_request_platform(&fw, data->fw_name, dev);
+ if (error) {
+ dev_err(dev, "Firmware request error %d\n", error);
+ return error;
+ }
+
+ error = device_property_read_u32_array(dev, "silead,efi-fw-min-max",
+ data->efi_fw_min_max,
+ ARRAY_SIZE(data->efi_fw_min_max));
+ if (!error)
+ data->efi_fw_min_max_set = true;
+
+ /* The EFI (platform) embedded fw does not have pen support */
+ if (data->pen_supported) {
+ dev_warn(dev, "Warning loading '%s' from filesystem failed, using EFI embedded copy.\n",
+ data->fw_name);
+ dev_warn(dev, "Warning pen support is known to be broken in the EFI embedded fw version\n");
+ data->pen_supported = false;
+ }
+ }
+
+ fw_size = fw->size / sizeof(*fw_data);
+ fw_data = (struct silead_fw_data *)fw->data;
+
+ for (i = 0; i < fw_size; i++) {
+ error = i2c_smbus_write_i2c_block_data(client,
+ fw_data[i].offset,
+ 4,
+ (u8 *)&fw_data[i].val);
+ if (error) {
+ dev_err(dev, "Firmware load error %d\n", error);
+ break;
+ }
+ }
+
+ release_firmware(fw);
+ return error ?: 0;
+}
+
+static u32 silead_ts_get_status(struct i2c_client *client)
+{
+ int error;
+ __le32 status;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
+ sizeof(status), (u8 *)&status);
+ if (error < 0) {
+ dev_err(&client->dev, "Status read error %d\n", error);
+ return error;
+ }
+
+ return le32_to_cpu(status);
+}
+
+static int silead_ts_get_id(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ __le32 chip_id;
+ int error;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
+ sizeof(chip_id), (u8 *)&chip_id);
+ if (error < 0)
+ return error;
+
+ data->chip_id = le32_to_cpu(chip_id);
+ dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
+
+ return 0;
+}
+
+static int silead_ts_setup(struct i2c_client *client)
+{
+ int error;
+ u32 status;
+
+ /*
+ * Some buggy BIOS-es bring up the chip in a stuck state where it
+ * blocks the I2C bus. The following steps are necessary to
+ * unstuck the chip / bus:
+ * 1. Turn off the Silead chip.
+ * 2. Try to do an I2C transfer with the chip, this will fail in
+ * response to which the I2C-bus-driver will call:
+ * i2c_recover_bus() which will unstuck the I2C-bus. Note the
+ * unstuck-ing of the I2C bus only works if we first drop the
+ * chip off the bus by turning it off.
+ * 3. Turn the chip back on.
+ *
+ * On the x86/ACPI systems were this problem is seen, step 1. and
+ * 3. require making ACPI calls and dealing with ACPI Power
+ * Resources. The workaround below runtime-suspends the chip to
+ * turn it off, leaving it up to the ACPI subsystem to deal with
+ * this.
+ */
+
+ if (device_property_read_bool(&client->dev,
+ "silead,stuck-controller-bug")) {
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ pm_runtime_allow(&client->dev);
+
+ pm_runtime_suspend(&client->dev);
+
+ dev_warn(&client->dev, FW_BUG "Stuck I2C bus: please ignore the next 'controller timed out' error\n");
+ silead_ts_get_id(client);
+
+ /* The forbid will also resume the device */
+ pm_runtime_forbid(&client->dev);
+ pm_runtime_disable(&client->dev);
+ }
+
+ silead_ts_set_power(client, SILEAD_POWER_OFF);
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ error = silead_ts_get_id(client);
+ if (error) {
+ dev_err(&client->dev, "Chip ID read error %d\n", error);
+ return error;
+ }
+
+ error = silead_ts_init(client);
+ if (error)
+ return error;
+
+ error = silead_ts_reset(client);
+ if (error)
+ return error;
+
+ error = silead_ts_load_fw(client);
+ if (error)
+ return error;
+
+ error = silead_ts_startup(client);
+ if (error)
+ return error;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ dev_err(&client->dev,
+ "Initialization error, status: 0x%X\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
+{
+ struct silead_ts_data *data = id;
+ struct i2c_client *client = data->client;
+
+ silead_ts_read_data(client);
+
+ return IRQ_HANDLED;
+}
+
+static void silead_ts_read_props(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ const char *str;
+ int error;
+
+ error = device_property_read_u32(dev, "silead,max-fingers",
+ &data->max_fingers);
+ if (error) {
+ dev_dbg(dev, "Max fingers read error %d\n", error);
+ data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
+ }
+
+ error = device_property_read_string(dev, "firmware-name", &str);
+ if (!error)
+ snprintf(data->fw_name, sizeof(data->fw_name),
+ "silead/%s", str);
+ else
+ dev_dbg(dev, "Firmware file name read error. Using default.");
+
+ data->pen_supported = device_property_read_bool(dev, "silead,pen-supported");
+ device_property_read_u32(dev, "silead,pen-resolution-x", &data->pen_x_res);
+ device_property_read_u32(dev, "silead,pen-resolution-y", &data->pen_y_res);
+}
+
+#ifdef CONFIG_ACPI
+static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
+ const struct i2c_device_id *id)
+{
+ const struct acpi_device_id *acpi_id;
+ struct device *dev = &data->client->dev;
+ int i;
+
+ if (ACPI_HANDLE(dev)) {
+ acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!acpi_id)
+ return -ENODEV;
+
+ snprintf(data->fw_name, sizeof(data->fw_name),
+ "silead/%s.fw", acpi_id->id);
+
+ for (i = 0; i < strlen(data->fw_name); i++)
+ data->fw_name[i] = tolower(data->fw_name[i]);
+ } else {
+ snprintf(data->fw_name, sizeof(data->fw_name),
+ "silead/%s.fw", id->name);
+ }
+
+ return 0;
+}
+#else
+static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
+ const struct i2c_device_id *id)
+{
+ snprintf(data->fw_name, sizeof(data->fw_name),
+ "silead/%s.fw", id->name);
+ return 0;
+}
+#endif
+
+static void silead_disable_regulator(void *arg)
+{
+ struct silead_ts_data *data = arg;
+
+ regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
+}
+
+static int silead_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct silead_ts_data *data;
+ struct device *dev = &client->dev;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_READ_I2C_BLOCK |
+ I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
+ dev_err(dev, "I2C functionality check failed\n");
+ return -ENXIO;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ data->client = client;
+
+ error = silead_ts_set_default_fw_name(data, id);
+ if (error)
+ return error;
+
+ silead_ts_read_props(client);
+
+ /* We must have the IRQ provided by DT or ACPI subsystem */
+ if (client->irq <= 0)
+ return -ENODEV;
+
+ data->regulators[0].supply = "vddio";
+ data->regulators[1].supply = "avdd";
+ error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
+ data->regulators);
+ if (error)
+ return error;
+
+ /*
+ * Enable regulators at probe and disable them at remove, we need
+ * to keep the chip powered otherwise it forgets its firmware.
+ */
+ error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
+ data->regulators);
+ if (error)
+ return error;
+
+ error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
+ if (error)
+ return error;
+
+ /* Power GPIO pin */
+ data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
+ if (IS_ERR(data->gpio_power)) {
+ if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
+ dev_err(dev, "Shutdown GPIO request failed\n");
+ return PTR_ERR(data->gpio_power);
+ }
+
+ error = silead_ts_setup(client);
+ if (error)
+ return error;
+
+ error = silead_ts_request_input_dev(data);
+ if (error)
+ return error;
+
+ error = silead_ts_request_pen_input_dev(data);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(dev, client->irq,
+ NULL, silead_ts_threaded_irq_handler,
+ IRQF_ONESHOT, client->name, data);
+ if (error) {
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "IRQ request failed %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused silead_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ disable_irq(client->irq);
+ silead_ts_set_power(client, SILEAD_POWER_OFF);
+ return 0;
+}
+
+static int __maybe_unused silead_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ bool second_try = false;
+ int error, status;
+
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ retry:
+ error = silead_ts_reset(client);
+ if (error)
+ return error;
+
+ if (second_try) {
+ error = silead_ts_load_fw(client);
+ if (error)
+ return error;
+ }
+
+ error = silead_ts_startup(client);
+ if (error)
+ return error;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ if (!second_try) {
+ second_try = true;
+ dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
+ goto retry;
+ }
+ dev_err(dev, "Resume error, status: 0x%02x\n", status);
+ return -ENODEV;
+ }
+
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
+
+static const struct i2c_device_id silead_ts_id[] = {
+ { "gsl1680", 0 },
+ { "gsl1688", 0 },
+ { "gsl3670", 0 },
+ { "gsl3675", 0 },
+ { "gsl3692", 0 },
+ { "mssl1680", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, silead_ts_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id silead_ts_acpi_match[] = {
+ { "GSL1680", 0 },
+ { "GSL1688", 0 },
+ { "GSL3670", 0 },
+ { "GSL3675", 0 },
+ { "GSL3692", 0 },
+ { "MSSL1680", 0 },
+ { "MSSL0001", 0 },
+ { "MSSL0002", 0 },
+ { "MSSL0017", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id silead_ts_of_match[] = {
+ { .compatible = "silead,gsl1680" },
+ { .compatible = "silead,gsl1688" },
+ { .compatible = "silead,gsl3670" },
+ { .compatible = "silead,gsl3675" },
+ { .compatible = "silead,gsl3692" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, silead_ts_of_match);
+#endif
+
+static struct i2c_driver silead_ts_driver = {
+ .probe = silead_ts_probe,
+ .id_table = silead_ts_id,
+ .driver = {
+ .name = SILEAD_TS_NAME,
+ .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
+ .of_match_table = of_match_ptr(silead_ts_of_match),
+ .pm = &silead_ts_pm,
+ },
+};
+module_i2c_driver(silead_ts_driver);
+
+MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
+MODULE_DESCRIPTION("Silead I2C touchscreen driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 02:16:05 +0000