Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1146 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/hideep.c b/drivers/input/touchscreen/hideep.c
new file mode 100644
index 0000000000..404153338d
--- /dev/null
+++ b/drivers/input/touchscreen/hideep.c
@@ -0,0 +1,1146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2012-2017 Hideep, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/firmware.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/regulator/consumer.h>
+#include <asm/unaligned.h>
+
+#define HIDEEP_TS_NAME			"HiDeep Touchscreen"
+#define HIDEEP_I2C_NAME			"hideep_ts"
+
+#define HIDEEP_MT_MAX			10
+#define HIDEEP_KEY_MAX			3
+
+/* count(2) + touch data(100) + key data(6) */
+#define HIDEEP_MAX_EVENT		108UL
+
+#define HIDEEP_TOUCH_EVENT_INDEX	2
+#define HIDEEP_KEY_EVENT_INDEX		102
+
+/* Touch & key event */
+#define HIDEEP_EVENT_ADDR		0x240
+
+/* command list */
+#define HIDEEP_WORK_MODE		0x081e
+#define HIDEEP_RESET_CMD		0x9800
+
+/* event bit */
+#define HIDEEP_MT_RELEASED		BIT(4)
+#define HIDEEP_KEY_PRESSED		BIT(7)
+#define HIDEEP_KEY_FIRST_PRESSED	BIT(8)
+#define HIDEEP_KEY_PRESSED_MASK		(HIDEEP_KEY_PRESSED | \
+					 HIDEEP_KEY_FIRST_PRESSED)
+
+#define HIDEEP_KEY_IDX_MASK		0x0f
+
+/* For NVM */
+#define HIDEEP_YRAM_BASE		0x40000000
+#define HIDEEP_PERIPHERAL_BASE		0x50000000
+#define HIDEEP_ESI_BASE			(HIDEEP_PERIPHERAL_BASE + 0x00000000)
+#define HIDEEP_FLASH_BASE		(HIDEEP_PERIPHERAL_BASE + 0x01000000)
+#define HIDEEP_SYSCON_BASE		(HIDEEP_PERIPHERAL_BASE + 0x02000000)
+
+#define HIDEEP_SYSCON_MOD_CON		(HIDEEP_SYSCON_BASE + 0x0000)
+#define HIDEEP_SYSCON_SPC_CON		(HIDEEP_SYSCON_BASE + 0x0004)
+#define HIDEEP_SYSCON_CLK_CON		(HIDEEP_SYSCON_BASE + 0x0008)
+#define HIDEEP_SYSCON_CLK_ENA		(HIDEEP_SYSCON_BASE + 0x000C)
+#define HIDEEP_SYSCON_RST_CON		(HIDEEP_SYSCON_BASE + 0x0010)
+#define HIDEEP_SYSCON_WDT_CON		(HIDEEP_SYSCON_BASE + 0x0014)
+#define HIDEEP_SYSCON_WDT_CNT		(HIDEEP_SYSCON_BASE + 0x0018)
+#define HIDEEP_SYSCON_PWR_CON		(HIDEEP_SYSCON_BASE + 0x0020)
+#define HIDEEP_SYSCON_PGM_ID		(HIDEEP_SYSCON_BASE + 0x00F4)
+
+#define HIDEEP_FLASH_CON		(HIDEEP_FLASH_BASE + 0x0000)
+#define HIDEEP_FLASH_STA		(HIDEEP_FLASH_BASE + 0x0004)
+#define HIDEEP_FLASH_CFG		(HIDEEP_FLASH_BASE + 0x0008)
+#define HIDEEP_FLASH_TIM		(HIDEEP_FLASH_BASE + 0x000C)
+#define HIDEEP_FLASH_CACHE_CFG		(HIDEEP_FLASH_BASE + 0x0010)
+#define HIDEEP_FLASH_PIO_SIG		(HIDEEP_FLASH_BASE + 0x400000)
+
+#define HIDEEP_ESI_TX_INVALID		(HIDEEP_ESI_BASE + 0x0008)
+
+#define HIDEEP_PERASE			0x00040000
+#define HIDEEP_WRONLY			0x00100000
+
+#define HIDEEP_NVM_MASK_OFS		0x0000000C
+#define HIDEEP_NVM_DEFAULT_PAGE		0
+#define HIDEEP_NVM_SFR_WPAGE		1
+#define HIDEEP_NVM_SFR_RPAGE		2
+
+#define HIDEEP_PIO_SIG			0x00400000
+#define HIDEEP_PROT_MODE		0x03400000
+
+#define HIDEEP_NVM_PAGE_SIZE		128
+
+#define HIDEEP_DWZ_INFO			0x000002C0
+
+struct hideep_event {
+	__le16 x;
+	__le16 y;
+	__le16 z;
+	u8 w;
+	u8 flag;
+	u8 type;
+	u8 index;
+};
+
+struct dwz_info {
+	__be32 code_start;
+	u8 code_crc[12];
+
+	__be32 c_code_start;
+	__be16 gen_ver;
+	__be16 c_code_len;
+
+	__be32 vr_start;
+	__be16 rsv0;
+	__be16 vr_len;
+
+	__be32 ft_start;
+	__be16 vr_version;
+	__be16 ft_len;
+
+	__be16 core_ver;
+	__be16 boot_ver;
+
+	__be16 release_ver;
+	__be16 custom_ver;
+
+	u8 factory_id;
+	u8 panel_type;
+	u8 model_name[6];
+
+	__be16 extra_option;
+	__be16 product_code;
+
+	__be16 vendor_id;
+	__be16 product_id;
+};
+
+struct pgm_packet {
+	struct {
+		u8 unused[3];
+		u8 len;
+		__be32 addr;
+	} header;
+	__be32 payload[HIDEEP_NVM_PAGE_SIZE / sizeof(__be32)];
+};
+
+#define HIDEEP_XFER_BUF_SIZE	sizeof(struct pgm_packet)
+
+struct hideep_ts {
+	struct i2c_client *client;
+	struct input_dev *input_dev;
+	struct regmap *reg;
+
+	struct touchscreen_properties prop;
+
+	struct gpio_desc *reset_gpio;
+
+	struct regulator *vcc_vdd;
+	struct regulator *vcc_vid;
+
+	struct mutex dev_mutex;
+
+	u32 tch_count;
+	u32 lpm_count;
+
+	/*
+	 * Data buffer to read packet from the device (contacts and key
+	 * states). We align it on double-word boundary to keep word-sized
+	 * fields in contact data and double-word-sized fields in program
+	 * packet aligned.
+	 */
+	u8 xfer_buf[HIDEEP_XFER_BUF_SIZE] __aligned(4);
+
+	int key_num;
+	u32 key_codes[HIDEEP_KEY_MAX];
+
+	struct dwz_info dwz_info;
+
+	unsigned int fw_size;
+	u32 nvm_mask;
+};
+
+static int hideep_pgm_w_mem(struct hideep_ts *ts, u32 addr,
+			    const __be32 *data, size_t count)
+{
+	struct pgm_packet *packet = (void *)ts->xfer_buf;
+	size_t len = count * sizeof(*data);
+	struct i2c_msg msg = {
+		.addr	= ts->client->addr,
+		.len	= len + sizeof(packet->header.len) +
+				sizeof(packet->header.addr),
+		.buf	= &packet->header.len,
+	};
+	int ret;
+
+	if (len > HIDEEP_NVM_PAGE_SIZE)
+		return -EINVAL;
+
+	packet->header.len = 0x80 | (count - 1);
+	packet->header.addr = cpu_to_be32(addr);
+	memcpy(packet->payload, data, len);
+
+	ret = i2c_transfer(ts->client->adapter, &msg, 1);
+	if (ret != 1)
+		return ret < 0 ? ret : -EIO;
+
+	return 0;
+}
+
+static int hideep_pgm_r_mem(struct hideep_ts *ts, u32 addr,
+			    __be32 *data, size_t count)
+{
+	struct pgm_packet *packet = (void *)ts->xfer_buf;
+	size_t len = count * sizeof(*data);
+	struct i2c_msg msg[] = {
+		{
+			.addr	= ts->client->addr,
+			.len	= sizeof(packet->header.len) +
+					sizeof(packet->header.addr),
+			.buf	= &packet->header.len,
+		},
+		{
+			.addr	= ts->client->addr,
+			.flags	= I2C_M_RD,
+			.len	= len,
+			.buf	= (u8 *)data,
+		},
+	};
+	int ret;
+
+	if (len > HIDEEP_NVM_PAGE_SIZE)
+		return -EINVAL;
+
+	packet->header.len = count - 1;
+	packet->header.addr = cpu_to_be32(addr);
+
+	ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
+	if (ret != ARRAY_SIZE(msg))
+		return ret < 0 ? ret : -EIO;
+
+	return 0;
+}
+
+static int hideep_pgm_r_reg(struct hideep_ts *ts, u32 addr, u32 *val)
+{
+	__be32 data;
+	int error;
+
+	error = hideep_pgm_r_mem(ts, addr, &data, 1);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"read of register %#08x failed: %d\n",
+			addr, error);
+		return error;
+	}
+
+	*val = be32_to_cpu(data);
+	return 0;
+}
+
+static int hideep_pgm_w_reg(struct hideep_ts *ts, u32 addr, u32 val)
+{
+	__be32 data = cpu_to_be32(val);
+	int error;
+
+	error = hideep_pgm_w_mem(ts, addr, &data, 1);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"write to register %#08x (%#08x) failed: %d\n",
+			addr, val, error);
+		return error;
+	}
+
+	return 0;
+}
+
+#define SW_RESET_IN_PGM(clk)					\
+{								\
+	__be32 data = cpu_to_be32(0x01);			\
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CNT, (clk));	\
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x03);	\
+	/*							\
+	 * The first write may already cause a reset, use a raw	\
+	 * write for the second write to avoid error logging.	\
+	 */							\
+	hideep_pgm_w_mem(ts, HIDEEP_SYSCON_WDT_CON, &data, 1);	\
+}
+
+#define SET_FLASH_PIO(ce)					\
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON,			\
+			 0x01 | ((ce) << 1))
+
+#define SET_PIO_SIG(x, y)					\
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_PIO_SIG + (x), (y))
+
+#define SET_FLASH_HWCONTROL()					\
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CON, 0x00)
+
+#define NVM_W_SFR(x, y)						\
+{								\
+	SET_FLASH_PIO(1);					\
+	SET_PIO_SIG(x, y);					\
+	SET_FLASH_PIO(0);					\
+}
+
+static void hideep_pgm_set(struct hideep_ts *ts)
+{
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_WDT_CON, 0x00);
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_SPC_CON, 0x00);
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_ENA, 0xFF);
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_CLK_CON, 0x01);
+	hideep_pgm_w_reg(ts, HIDEEP_SYSCON_PWR_CON, 0x01);
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_TIM, 0x03);
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CACHE_CFG, 0x00);
+}
+
+static int hideep_pgm_get_pattern(struct hideep_ts *ts, u32 *pattern)
+{
+	u16 p1 = 0xAF39;
+	u16 p2 = 0xDF9D;
+	int error;
+
+	error = regmap_bulk_write(ts->reg, p1, &p2, 1);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"%s: regmap_bulk_write() failed with %d\n",
+			__func__, error);
+		return error;
+	}
+
+	usleep_range(1000, 1100);
+
+	/* flush invalid Tx load register */
+	error = hideep_pgm_w_reg(ts, HIDEEP_ESI_TX_INVALID, 0x01);
+	if (error)
+		return error;
+
+	error = hideep_pgm_r_reg(ts, HIDEEP_SYSCON_PGM_ID, pattern);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static int hideep_enter_pgm(struct hideep_ts *ts)
+{
+	int retry_count = 10;
+	u32 pattern;
+	int error;
+
+	while (retry_count--) {
+		error = hideep_pgm_get_pattern(ts, &pattern);
+		if (error) {
+			dev_err(&ts->client->dev,
+				"hideep_pgm_get_pattern failed: %d\n", error);
+		} else if (pattern != 0x39AF9DDF) {
+			dev_err(&ts->client->dev, "%s: bad pattern: %#08x\n",
+				__func__, pattern);
+		} else {
+			dev_dbg(&ts->client->dev, "found magic code");
+
+			hideep_pgm_set(ts);
+			usleep_range(1000, 1100);
+
+			return 0;
+		}
+	}
+
+	dev_err(&ts->client->dev, "failed to  enter pgm mode\n");
+	SW_RESET_IN_PGM(1000);
+	return -EIO;
+}
+
+static int hideep_nvm_unlock(struct hideep_ts *ts)
+{
+	u32 unmask_code;
+	int error;
+
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE);
+	error = hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
+	if (error)
+		return error;
+
+	/* make it unprotected code */
+	unmask_code &= ~HIDEEP_PROT_MODE;
+
+	/* compare unmask code */
+	if (unmask_code != ts->nvm_mask)
+		dev_warn(&ts->client->dev,
+			 "read mask code different %#08x vs %#08x",
+			 unmask_code, ts->nvm_mask);
+
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_WPAGE);
+	SET_FLASH_PIO(0);
+
+	NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask);
+	SET_FLASH_HWCONTROL();
+	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
+
+	return 0;
+}
+
+static int hideep_check_status(struct hideep_ts *ts)
+{
+	int time_out = 100;
+	int status;
+	int error;
+
+	while (time_out--) {
+		error = hideep_pgm_r_reg(ts, HIDEEP_FLASH_STA, &status);
+		if (!error && status)
+			return 0;
+
+		usleep_range(1000, 1100);
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int hideep_program_page(struct hideep_ts *ts, u32 addr,
+			       const __be32 *ucode, size_t xfer_count)
+{
+	u32 val;
+	int error;
+
+	error = hideep_check_status(ts);
+	if (error)
+		return -EBUSY;
+
+	addr &= ~(HIDEEP_NVM_PAGE_SIZE - 1);
+
+	SET_FLASH_PIO(0);
+	SET_FLASH_PIO(1);
+
+	/* erase page */
+	SET_PIO_SIG(HIDEEP_PERASE | addr, 0xFFFFFFFF);
+
+	SET_FLASH_PIO(0);
+
+	error = hideep_check_status(ts);
+	if (error)
+		return -EBUSY;
+
+	/* write page */
+	SET_FLASH_PIO(1);
+
+	val = be32_to_cpu(ucode[0]);
+	SET_PIO_SIG(HIDEEP_WRONLY | addr, val);
+
+	hideep_pgm_w_mem(ts, HIDEEP_FLASH_PIO_SIG | HIDEEP_WRONLY,
+			 ucode, xfer_count);
+
+	val = be32_to_cpu(ucode[xfer_count - 1]);
+	SET_PIO_SIG(124, val);
+
+	SET_FLASH_PIO(0);
+
+	usleep_range(1000, 1100);
+
+	error = hideep_check_status(ts);
+	if (error)
+		return -EBUSY;
+
+	SET_FLASH_HWCONTROL();
+
+	return 0;
+}
+
+static int hideep_program_nvm(struct hideep_ts *ts,
+			      const __be32 *ucode, size_t ucode_len)
+{
+	struct pgm_packet *packet_r = (void *)ts->xfer_buf;
+	__be32 *current_ucode = packet_r->payload;
+	size_t xfer_len;
+	size_t xfer_count;
+	u32 addr = 0;
+	int error;
+
+	error = hideep_nvm_unlock(ts);
+	if (error)
+		return error;
+
+	while (ucode_len > 0) {
+		xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
+		xfer_count = xfer_len / sizeof(*ucode);
+
+		error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
+					 current_ucode, xfer_count);
+		if (error) {
+			dev_err(&ts->client->dev,
+				"%s: failed to read page at offset %#08x: %d\n",
+				__func__, addr, error);
+			return error;
+		}
+
+		/* See if the page needs updating */
+		if (memcmp(ucode, current_ucode, xfer_len)) {
+			error = hideep_program_page(ts, addr,
+						    ucode, xfer_count);
+			if (error) {
+				dev_err(&ts->client->dev,
+					"%s: iwrite failure @%#08x: %d\n",
+					__func__, addr, error);
+				return error;
+			}
+
+			usleep_range(1000, 1100);
+		}
+
+		ucode += xfer_count;
+		addr += xfer_len;
+		ucode_len -= xfer_len;
+	}
+
+	return 0;
+}
+
+static int hideep_verify_nvm(struct hideep_ts *ts,
+			     const __be32 *ucode, size_t ucode_len)
+{
+	struct pgm_packet *packet_r = (void *)ts->xfer_buf;
+	__be32 *current_ucode = packet_r->payload;
+	size_t xfer_len;
+	size_t xfer_count;
+	u32 addr = 0;
+	int i;
+	int error;
+
+	while (ucode_len > 0) {
+		xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
+		xfer_count = xfer_len / sizeof(*ucode);
+
+		error = hideep_pgm_r_mem(ts, 0x00000000 + addr,
+					 current_ucode, xfer_count);
+		if (error) {
+			dev_err(&ts->client->dev,
+				"%s: failed to read page at offset %#08x: %d\n",
+				__func__, addr, error);
+			return error;
+		}
+
+		if (memcmp(ucode, current_ucode, xfer_len)) {
+			const u8 *ucode_bytes = (const u8 *)ucode;
+			const u8 *current_bytes = (const u8 *)current_ucode;
+
+			for (i = 0; i < xfer_len; i++)
+				if (ucode_bytes[i] != current_bytes[i])
+					dev_err(&ts->client->dev,
+						"%s: mismatch @%#08x: (%#02x vs %#02x)\n",
+						__func__, addr + i,
+						ucode_bytes[i],
+						current_bytes[i]);
+
+			return -EIO;
+		}
+
+		ucode += xfer_count;
+		addr += xfer_len;
+		ucode_len -= xfer_len;
+	}
+
+	return 0;
+}
+
+static int hideep_load_dwz(struct hideep_ts *ts)
+{
+	u16 product_code;
+	int error;
+
+	error = hideep_enter_pgm(ts);
+	if (error)
+		return error;
+
+	msleep(50);
+
+	error = hideep_pgm_r_mem(ts, HIDEEP_DWZ_INFO,
+				 (void *)&ts->dwz_info,
+				 sizeof(ts->dwz_info) / sizeof(__be32));
+
+	SW_RESET_IN_PGM(10);
+	msleep(50);
+
+	if (error) {
+		dev_err(&ts->client->dev,
+			"failed to fetch DWZ data: %d\n", error);
+		return error;
+	}
+
+	product_code = be16_to_cpu(ts->dwz_info.product_code);
+
+	switch (product_code & 0xF0) {
+	case 0x40:
+		dev_dbg(&ts->client->dev, "used crimson IC");
+		ts->fw_size = 1024 * 48;
+		ts->nvm_mask = 0x00310000;
+		break;
+	case 0x60:
+		dev_dbg(&ts->client->dev, "used lime IC");
+		ts->fw_size = 1024 * 64;
+		ts->nvm_mask = 0x0030027B;
+		break;
+	default:
+		dev_err(&ts->client->dev, "product code is wrong: %#04x",
+			product_code);
+		return -EINVAL;
+	}
+
+	dev_dbg(&ts->client->dev, "firmware release version: %#04x",
+		be16_to_cpu(ts->dwz_info.release_ver));
+
+	return 0;
+}
+
+static int hideep_flash_firmware(struct hideep_ts *ts,
+				 const __be32 *ucode, size_t ucode_len)
+{
+	int retry_cnt = 3;
+	int error;
+
+	while (retry_cnt--) {
+		error = hideep_program_nvm(ts, ucode, ucode_len);
+		if (!error) {
+			error = hideep_verify_nvm(ts, ucode, ucode_len);
+			if (!error)
+				return 0;
+		}
+	}
+
+	return error;
+}
+
+static int hideep_update_firmware(struct hideep_ts *ts,
+				  const __be32 *ucode, size_t ucode_len)
+{
+	int error, error2;
+
+	dev_dbg(&ts->client->dev, "starting firmware update");
+
+	/* enter program mode */
+	error = hideep_enter_pgm(ts);
+	if (error)
+		return error;
+
+	error = hideep_flash_firmware(ts, ucode, ucode_len);
+	if (error)
+		dev_err(&ts->client->dev,
+			"firmware update failed: %d\n", error);
+	else
+		dev_dbg(&ts->client->dev, "firmware updated successfully\n");
+
+	SW_RESET_IN_PGM(1000);
+
+	error2 = hideep_load_dwz(ts);
+	if (error2)
+		dev_err(&ts->client->dev,
+			"failed to load dwz after firmware update: %d\n",
+			error2);
+
+	return error ?: error2;
+}
+
+static int hideep_power_on(struct hideep_ts *ts)
+{
+	int error = 0;
+
+	error = regulator_enable(ts->vcc_vdd);
+	if (error)
+		dev_err(&ts->client->dev,
+			"failed to enable 'vdd' regulator: %d", error);
+
+	usleep_range(999, 1000);
+
+	error = regulator_enable(ts->vcc_vid);
+	if (error)
+		dev_err(&ts->client->dev,
+			"failed to enable 'vcc_vid' regulator: %d",
+			error);
+
+	msleep(30);
+
+	if (ts->reset_gpio) {
+		gpiod_set_value_cansleep(ts->reset_gpio, 0);
+	} else {
+		error = regmap_write(ts->reg, HIDEEP_RESET_CMD, 0x01);
+		if (error)
+			dev_err(&ts->client->dev,
+				"failed to send 'reset' command: %d\n", error);
+	}
+
+	msleep(50);
+
+	return error;
+}
+
+static void hideep_power_off(void *data)
+{
+	struct hideep_ts *ts = data;
+
+	if (ts->reset_gpio)
+		gpiod_set_value(ts->reset_gpio, 1);
+
+	regulator_disable(ts->vcc_vid);
+	regulator_disable(ts->vcc_vdd);
+}
+
+#define __GET_MT_TOOL_TYPE(type) ((type) == 0x01 ? MT_TOOL_FINGER : MT_TOOL_PEN)
+
+static void hideep_report_slot(struct input_dev *input,
+			       const struct hideep_event *event)
+{
+	input_mt_slot(input, event->index & 0x0f);
+	input_mt_report_slot_state(input,
+				   __GET_MT_TOOL_TYPE(event->type),
+				   !(event->flag & HIDEEP_MT_RELEASED));
+	if (!(event->flag & HIDEEP_MT_RELEASED)) {
+		input_report_abs(input, ABS_MT_POSITION_X,
+				 le16_to_cpup(&event->x));
+		input_report_abs(input, ABS_MT_POSITION_Y,
+				 le16_to_cpup(&event->y));
+		input_report_abs(input, ABS_MT_PRESSURE,
+				 le16_to_cpup(&event->z));
+		input_report_abs(input, ABS_MT_TOUCH_MAJOR, event->w);
+	}
+}
+
+static void hideep_parse_and_report(struct hideep_ts *ts)
+{
+	const struct hideep_event *events =
+			(void *)&ts->xfer_buf[HIDEEP_TOUCH_EVENT_INDEX];
+	const u8 *keys = &ts->xfer_buf[HIDEEP_KEY_EVENT_INDEX];
+	int touch_count = ts->xfer_buf[0];
+	int key_count = ts->xfer_buf[1] & 0x0f;
+	int lpm_count = ts->xfer_buf[1] & 0xf0;
+	int i;
+
+	/* get touch event count */
+	dev_dbg(&ts->client->dev, "mt = %d, key = %d, lpm = %02x",
+		touch_count, key_count, lpm_count);
+
+	touch_count = min(touch_count, HIDEEP_MT_MAX);
+	for (i = 0; i < touch_count; i++)
+		hideep_report_slot(ts->input_dev, events + i);
+
+	key_count = min(key_count, HIDEEP_KEY_MAX);
+	for (i = 0; i < key_count; i++) {
+		u8 key_data = keys[i * 2];
+
+		input_report_key(ts->input_dev,
+				 ts->key_codes[key_data & HIDEEP_KEY_IDX_MASK],
+				 key_data & HIDEEP_KEY_PRESSED_MASK);
+	}
+
+	input_mt_sync_frame(ts->input_dev);
+	input_sync(ts->input_dev);
+}
+
+static irqreturn_t hideep_irq(int irq, void *handle)
+{
+	struct hideep_ts *ts = handle;
+	int error;
+
+	BUILD_BUG_ON(HIDEEP_MAX_EVENT > HIDEEP_XFER_BUF_SIZE);
+
+	error = regmap_bulk_read(ts->reg, HIDEEP_EVENT_ADDR,
+				 ts->xfer_buf, HIDEEP_MAX_EVENT / 2);
+	if (error) {
+		dev_err(&ts->client->dev, "failed to read events: %d\n", error);
+		goto out;
+	}
+
+	hideep_parse_and_report(ts);
+
+out:
+	return IRQ_HANDLED;
+}
+
+static int hideep_get_axis_info(struct hideep_ts *ts)
+{
+	__le16 val[2];
+	int error;
+
+	error = regmap_bulk_read(ts->reg, 0x28, val, ARRAY_SIZE(val));
+	if (error)
+		return error;
+
+	ts->prop.max_x = le16_to_cpup(val);
+	ts->prop.max_y = le16_to_cpup(val + 1);
+
+	dev_dbg(&ts->client->dev, "X: %d, Y: %d",
+		ts->prop.max_x, ts->prop.max_y);
+
+	return 0;
+}
+
+static int hideep_init_input(struct hideep_ts *ts)
+{
+	struct device *dev = &ts->client->dev;
+	int i;
+	int error;
+
+	ts->input_dev = devm_input_allocate_device(dev);
+	if (!ts->input_dev) {
+		dev_err(dev, "failed to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	ts->input_dev->name = HIDEEP_TS_NAME;
+	ts->input_dev->id.bustype = BUS_I2C;
+	input_set_drvdata(ts->input_dev, ts);
+
+	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
+	input_set_abs_params(ts->input_dev, ABS_MT_PRESSURE, 0, 65535, 0, 0);
+	input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+	input_set_abs_params(ts->input_dev, ABS_MT_TOOL_TYPE,
+			     0, MT_TOOL_MAX, 0, 0);
+	touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
+
+	if (ts->prop.max_x == 0 || ts->prop.max_y == 0) {
+		error = hideep_get_axis_info(ts);
+		if (error)
+			return error;
+	}
+
+	error = input_mt_init_slots(ts->input_dev, HIDEEP_MT_MAX,
+				    INPUT_MT_DIRECT);
+	if (error)
+		return error;
+
+	ts->key_num = device_property_count_u32(dev, "linux,keycodes");
+	if (ts->key_num > HIDEEP_KEY_MAX) {
+		dev_err(dev, "too many keys defined: %d\n",
+			ts->key_num);
+		return -EINVAL;
+	}
+
+	if (ts->key_num <= 0) {
+		dev_dbg(dev,
+			"missing or malformed 'linux,keycodes' property\n");
+	} else {
+		error = device_property_read_u32_array(dev, "linux,keycodes",
+						       ts->key_codes,
+						       ts->key_num);
+		if (error) {
+			dev_dbg(dev, "failed to read keymap: %d", error);
+			return error;
+		}
+
+		if (ts->key_num) {
+			ts->input_dev->keycode = ts->key_codes;
+			ts->input_dev->keycodesize = sizeof(ts->key_codes[0]);
+			ts->input_dev->keycodemax = ts->key_num;
+
+			for (i = 0; i < ts->key_num; i++)
+				input_set_capability(ts->input_dev, EV_KEY,
+					ts->key_codes[i]);
+		}
+	}
+
+	error = input_register_device(ts->input_dev);
+	if (error) {
+		dev_err(dev, "failed to register input device: %d", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static ssize_t hideep_update_fw(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hideep_ts *ts = i2c_get_clientdata(client);
+	const struct firmware *fw_entry;
+	char *fw_name;
+	int mode;
+	int error;
+
+	error = kstrtoint(buf, 0, &mode);
+	if (error)
+		return error;
+
+	fw_name = kasprintf(GFP_KERNEL, "hideep_ts_%04x.bin",
+			    be16_to_cpu(ts->dwz_info.product_id));
+	if (!fw_name)
+		return -ENOMEM;
+
+	error = request_firmware(&fw_entry, fw_name, dev);
+	if (error) {
+		dev_err(dev, "failed to request firmware %s: %d",
+			fw_name, error);
+		goto out_free_fw_name;
+	}
+
+	if (fw_entry->size % sizeof(__be32)) {
+		dev_err(dev, "invalid firmware size %zu\n", fw_entry->size);
+		error = -EINVAL;
+		goto out_release_fw;
+	}
+
+	if (fw_entry->size > ts->fw_size) {
+		dev_err(dev, "fw size (%zu) is too big (memory size %d)\n",
+			fw_entry->size, ts->fw_size);
+		error = -EFBIG;
+		goto out_release_fw;
+	}
+
+	mutex_lock(&ts->dev_mutex);
+	disable_irq(client->irq);
+
+	error = hideep_update_firmware(ts, (const __be32 *)fw_entry->data,
+				       fw_entry->size);
+
+	enable_irq(client->irq);
+	mutex_unlock(&ts->dev_mutex);
+
+out_release_fw:
+	release_firmware(fw_entry);
+out_free_fw_name:
+	kfree(fw_name);
+
+	return error ?: count;
+}
+
+static ssize_t hideep_fw_version_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hideep_ts *ts = i2c_get_clientdata(client);
+	ssize_t len;
+
+	mutex_lock(&ts->dev_mutex);
+	len = scnprintf(buf, PAGE_SIZE, "%04x\n",
+			be16_to_cpu(ts->dwz_info.release_ver));
+	mutex_unlock(&ts->dev_mutex);
+
+	return len;
+}
+
+static ssize_t hideep_product_id_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hideep_ts *ts = i2c_get_clientdata(client);
+	ssize_t len;
+
+	mutex_lock(&ts->dev_mutex);
+	len = scnprintf(buf, PAGE_SIZE, "%04x\n",
+			be16_to_cpu(ts->dwz_info.product_id));
+	mutex_unlock(&ts->dev_mutex);
+
+	return len;
+}
+
+static DEVICE_ATTR(version, 0664, hideep_fw_version_show, NULL);
+static DEVICE_ATTR(product_id, 0664, hideep_product_id_show, NULL);
+static DEVICE_ATTR(update_fw, 0664, NULL, hideep_update_fw);
+
+static struct attribute *hideep_ts_sysfs_entries[] = {
+	&dev_attr_version.attr,
+	&dev_attr_product_id.attr,
+	&dev_attr_update_fw.attr,
+	NULL,
+};
+
+static const struct attribute_group hideep_ts_attr_group = {
+	.attrs = hideep_ts_sysfs_entries,
+};
+
+static void hideep_set_work_mode(struct hideep_ts *ts)
+{
+	/*
+	 * Reset touch report format to the native HiDeep 20 protocol if requested.
+	 * This is necessary to make touchscreens which come up in I2C-HID mode
+	 * work with this driver.
+	 *
+	 * 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_bool(&ts->client->dev, "hideep,force-native-protocol"))
+		regmap_write(ts->reg, HIDEEP_WORK_MODE, 0x00);
+}
+
+static int hideep_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hideep_ts *ts = i2c_get_clientdata(client);
+
+	disable_irq(client->irq);
+	hideep_power_off(ts);
+
+	return 0;
+}
+
+static int hideep_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct hideep_ts *ts = i2c_get_clientdata(client);
+	int error;
+
+	error = hideep_power_on(ts);
+	if (error) {
+		dev_err(&client->dev, "power on failed");
+		return error;
+	}
+
+	hideep_set_work_mode(ts);
+
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(hideep_pm_ops, hideep_suspend, hideep_resume);
+
+static const struct regmap_config hideep_regmap_config = {
+	.reg_bits = 16,
+	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
+	.val_bits = 16,
+	.val_format_endian = REGMAP_ENDIAN_LITTLE,
+	.max_register = 0xffff,
+};
+
+static int hideep_probe(struct i2c_client *client)
+{
+	struct hideep_ts *ts;
+	int error;
+
+	/* check i2c bus */
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "check i2c device error");
+		return -ENODEV;
+	}
+
+	if (client->irq <= 0) {
+		dev_err(&client->dev, "missing irq: %d\n", client->irq);
+		return -EINVAL;
+	}
+
+	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->client = client;
+	i2c_set_clientdata(client, ts);
+	mutex_init(&ts->dev_mutex);
+
+	ts->reg = devm_regmap_init_i2c(client, &hideep_regmap_config);
+	if (IS_ERR(ts->reg)) {
+		error = PTR_ERR(ts->reg);
+		dev_err(&client->dev,
+			"failed to initialize regmap: %d\n", error);
+		return error;
+	}
+
+	ts->vcc_vdd = devm_regulator_get(&client->dev, "vdd");
+	if (IS_ERR(ts->vcc_vdd))
+		return PTR_ERR(ts->vcc_vdd);
+
+	ts->vcc_vid = devm_regulator_get(&client->dev, "vid");
+	if (IS_ERR(ts->vcc_vid))
+		return PTR_ERR(ts->vcc_vid);
+
+	ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
+						 "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ts->reset_gpio))
+		return PTR_ERR(ts->reset_gpio);
+
+	error = hideep_power_on(ts);
+	if (error) {
+		dev_err(&client->dev, "power on failed: %d\n", error);
+		return error;
+	}
+
+	error = devm_add_action_or_reset(&client->dev, hideep_power_off, ts);
+	if (error)
+		return error;
+
+	error = hideep_load_dwz(ts);
+	if (error) {
+		dev_err(&client->dev, "failed to load dwz: %d", error);
+		return error;
+	}
+
+	hideep_set_work_mode(ts);
+
+	error = hideep_init_input(ts);
+	if (error)
+		return error;
+
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, hideep_irq, IRQF_ONESHOT,
+					  client->name, ts);
+	if (error) {
+		dev_err(&client->dev, "failed to request irq %d: %d\n",
+			client->irq, error);
+		return error;
+	}
+
+	error = devm_device_add_group(&client->dev, &hideep_ts_attr_group);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to add sysfs attributes: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id hideep_i2c_id[] = {
+	{ HIDEEP_I2C_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, hideep_i2c_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id hideep_acpi_id[] = {
+	{ "HIDP0001", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, hideep_acpi_id);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id hideep_match_table[] = {
+	{ .compatible = "hideep,hideep-ts" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, hideep_match_table);
+#endif
+
+static struct i2c_driver hideep_driver = {
+	.driver = {
+		.name			= HIDEEP_I2C_NAME,
+		.of_match_table		= of_match_ptr(hideep_match_table),
+		.acpi_match_table	= ACPI_PTR(hideep_acpi_id),
+		.pm			= pm_sleep_ptr(&hideep_pm_ops),
+	},
+	.id_table	= hideep_i2c_id,
+	.probe		= hideep_probe,
+};
+
+module_i2c_driver(hideep_driver);
+
+MODULE_DESCRIPTION("Driver for HiDeep Touchscreen Controller");
+MODULE_AUTHOR("anthony.kim@hideep.com");
+MODULE_LICENSE("GPL v2");