[PATCH v5] Fix the resolution issue in ChromeOS
From: HungNien Chen
Date: Fri May 29 2015 - 00:27:33 EST
Signed-off-by: HungNien Chen <hn.chen@xxxxxxxxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/wdt87xx_i2c.c | 1404 +++++++++++++++++++++++++++++++
3 files changed, 1417 insertions(+)
create mode 100644 drivers/input/touchscreen/wdt87xx_i2c.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 80f6386..0c1a6cc 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -658,6 +658,18 @@ config TOUCHSCREEN_PIXCIR
To compile this driver as a module, choose M here: the
module will be called pixcir_i2c_ts.
+config TOUCHSCREEN_WDT87XX_I2C
+ tristate "Weida HiTech I2C touchscreen"
+ depends on I2C
+ help
+ Say Y here if you have an Weida WDT87XX I2C touchscreen
+ connected to your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called wdt87xx_i2c.
+
config TOUCHSCREEN_WM831X
tristate "Support for WM831x touchscreen controllers"
depends on MFD_WM831X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 44deea7..fa3d33b 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
obj-$(CONFIG_TOUCHSCREEN_WACOM_I2C) += wacom_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_WDT87XX_I2C) += wdt87xx_i2c.o
obj-$(CONFIG_TOUCHSCREEN_WM831X) += wm831x-ts.o
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o
diff --git a/drivers/input/touchscreen/wdt87xx_i2c.c b/drivers/input/touchscreen/wdt87xx_i2c.c
new file mode 100644
index 0000000..4998ad5
--- /dev/null
+++ b/drivers/input/touchscreen/wdt87xx_i2c.c
@@ -0,0 +1,1404 @@
+/*
+ * Weida HiTech WDT87xx TouchScreen I2C driver
+ *
+ * Copyright (c) 2015 Weida HiTech Ltd.
+ * HN Chen <hn.chen@xxxxxxxxxxxxxxx>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * Note: this is a I2C device driver and report touch events througt the
+ * input device
+ */
+
+
+#include <linux/version.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/ioc4.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/firmware.h>
+#include <linux/gpio.h>
+#include <linux/input/mt.h>
+#include <asm/unaligned.h>
+#include <linux/acpi.h>
+
+#define WDT87XX_NAME "wdt87xx_i2c"
+#define WDT87XX_DRV_VER "0.9.4"
+#define WDT87XX_FW_NAME "wdt87xx_fw.bin"
+
+#define WDT87XX_FW 1
+#define WDT87XX_CFG 2
+
+#define MODE_ACTIVE 0x01
+#define MODE_READY 0x02
+#define MODE_IDLE 0x03
+#define MODE_SLEEP 0x04
+#define MODE_STOP 0xFF
+
+#define WDT_PKT_V0 0
+#define WDT_PKT_V1 1
+
+#define WDT_MAX_FINGER 10
+#define WDT_RAW_BUF_COUNT 54
+#define WDT_V1_RAW_BUF_COUNT 74
+#define WDT_FIRMWARE_ID 0xa9e368f5
+
+#define PG_SIZE 0x1000
+#define MAX_RETRIES 3
+
+#define MAX_UNIT_AXIS 0x7FFF
+
+#define PKT_READ_SIZE 72
+#define PKT_WRITE_SIZE 80
+
+/* the definition for one finger */
+#define FINGER_EV_OFFSET_ID 0
+#define FINGER_EV_OFFSET_X 1
+#define FINGER_EV_OFFSET_Y 3
+#define FINGER_EV_SIZE 5
+
+#define FINGER_EV_V1_OFFSET_ID 0
+#define FINGER_EV_V1_OFFSET_W 1
+#define FINGER_EV_V1_OFFSET_H 2
+#define FINGER_EV_V1_OFFSET_X 3
+#define FINGER_EV_V1_OFFSET_Y 5
+#define FINGER_EV_V1_SIZE 7
+
+/* the definition for a packet */
+#define TOUCH_PK_OFFSET_REPORT_ID 0
+#define TOUCH_PK_OFFSET_EVENT 1
+#define TOUCH_PK_OFFSET_SCAN_TIME 51
+#define TOUCH_PK_OFFSET_FNGR_NUM 53
+
+#define TOUCH_PK_V1_OFFSET_REPORT_ID 0
+#define TOUCH_PK_V1_OFFSET_EVENT 1
+#define TOUCH_PK_V1_OFFSET_SCAN_TIME 71
+#define TOUCH_PK_V1_OFFSET_FNGR_NUM 73
+
+/* the definition for the controller parameters */
+#define CTL_PARAM_OFFSET_FW_ID 0
+#define CTL_PARAM_OFFSET_PLAT_ID 2
+#define CTL_PARAM_OFFSET_XMLS_ID1 4
+#define CTL_PARAM_OFFSET_XMLS_ID2 6
+#define CTL_PARAM_OFFSET_PHY_CH_X 8
+#define CTL_PARAM_OFFSET_PHY_CH_Y 10
+#define CTL_PARAM_OFFSET_PHY_X0 12
+#define CTL_PARAM_OFFSET_PHY_X1 14
+#define CTL_PARAM_OFFSET_PHY_Y0 16
+#define CTL_PARAM_OFFSET_PHY_Y1 18
+#define CTL_PARAM_OFFSET_PHY_W 22
+#define CTL_PARAM_OFFSET_PHY_H 24
+
+struct sys_param {
+ u16 fw_id;
+ u16 plat_id;
+ u16 xmls_id1;
+ u16 xmls_id2;
+ u16 phy_ch_x;
+ u16 phy_ch_y;
+ u16 phy_w;
+ u16 phy_h;
+} __packed;
+
+/* the definition for this driver needed */
+struct wdt87xx_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+/* to protect the operation in sysfs */
+ struct mutex sysfs_mutex;
+ u32 max_retries;
+ struct sys_param param;
+ u8 phys[32];
+ u32 packet_type;
+ u32 max_x;
+ u32 max_y;
+};
+
+/* communacation commands */
+#define PACKET_SIZE 56
+#define VND_REQ_READ 0x06
+#define VND_READ_DATA 0x07
+#define VND_REQ_WRITE 0x08
+
+#define VND_CMD_START 0x00
+#define VND_CMD_STOP 0x01
+#define VND_CMD_RESET 0x09
+
+#define VND_CMD_ERASE 0x1A
+
+#define VND_GET_CHECKSUM 0x66
+
+#define VND_SET_DATA 0x83
+#define VND_SET_COMMAND_DATA 0x84
+#define VND_SET_CHECKSUM_CALC 0x86
+#define VND_SET_CHECKSUM_LENGTH 0x87
+
+#define VND_CMD_SFLCK 0xFC
+#define VND_CMD_SFUNL 0xFD
+
+#define STRIDX_PLATFORM_ID 0x80
+#define STRIDX_PARAMETERS 0x81
+
+
+/* the definition of command structure */
+union cmd_data {
+ struct {
+ u8 report_id;
+ u8 type;
+ u16 index;
+ u32 length;
+ } defined_data;
+ u8 buffer[8];
+};
+
+/* the definition of packet structure */
+union req_data {
+ struct {
+ u8 report_id;
+ u8 type;
+ u16 index;
+ u32 length;
+ u8 data[PACKET_SIZE];
+ } defined_data;
+ u8 buffer[64];
+};
+
+/* the definition of firmware data structure */
+struct chunk_info {
+ u32 target_start_addr;
+ u32 length;
+ u32 source_start_addr;
+ u32 version_number;
+ u32 attribute;
+ u32 temp;
+};
+
+struct chunk_data {
+ u32 ck_id;
+ u32 ck_size;
+ struct chunk_info chunk_info;
+ u8 *data;
+};
+
+struct format_chunk {
+ u32 ck_id;
+ u32 ck_size;
+ u32 number_chunk;
+ u32 enable_flag;
+ u32 checksum;
+ u32 temp1;
+ u32 temp2;
+};
+
+struct chunk_info_ex {
+ struct chunk_info chunk_info;
+ u8 *data;
+ u32 length;
+};
+
+/* the definition of firmware chunk tags */
+#define FOURCC_ID_RIFF 0x46464952
+#define FOURCC_ID_WHIF 0x46494857
+#define FOURCC_ID_FRMT 0x544D5246
+#define FOURCC_ID_FRWR 0x52575246
+#define FOURCC_ID_CNFG 0x47464E43
+
+#define CHUNK_ID_FRMT FOURCC_ID_FRMT
+#define CHUNK_ID_FRWR FOURCC_ID_FRWR
+#define CHUNK_ID_CNFG FOURCC_ID_CNFG
+
+
+static int wdt87xx_i2c_txrxdata(struct i2c_client *client, char *txdata,
+ int txlen, char *rxdata, int rxlen);
+static int wdt87xx_i2c_rxdata(struct i2c_client *client, char *rxdata,
+ int length);
+static int wdt87xx_i2c_txdata(struct i2c_client *client, char *txdata,
+ int length);
+static int wdt87xx_set_feature(struct i2c_client *client, u8 *buf,
+ u32 buf_size);
+static int wdt87xx_get_feature(struct i2c_client *client, u8 *buf,
+ u32 buf_size);
+static int wdt87xx_get_string(struct i2c_client *client, u8 str_idx,
+ u8 *buf, u32 buf_size);
+
+static int get_chunk_info(const struct firmware *fw, u32 chunk_four_cc,
+ struct chunk_info_ex *fw_chunk_info,
+ struct format_chunk *wif_format_chunk)
+{
+ const char *data;
+ u32 data_len;
+ bool is_found = 0;
+ u32 start_pos;
+ struct chunk_data chunk;
+ u32 ck_id, ck_size;
+
+ data = fw->data;
+ data_len = fw->size;
+
+ /* check if the chunk is existed */
+ start_pos = 12 + sizeof(struct format_chunk);
+
+ while (start_pos < data_len && !is_found) {
+ ck_id = get_unaligned_le32(&data[start_pos]);
+ ck_size = get_unaligned_le32(&data[start_pos+4]);
+
+ /* the chunk is found */
+ if (ck_id == chunk_four_cc) {
+ chunk.ck_id = ck_id;
+ chunk.ck_size = ck_size;
+
+ chunk.data = (u8 *) &data[start_pos + 8
+ + sizeof(struct chunk_info)];
+ chunk.chunk_info.target_start_addr =
+ get_unaligned_le32(&data[start_pos+8]);
+ chunk.chunk_info.length =
+ get_unaligned_le32(&data[start_pos+12]);
+ chunk.chunk_info.source_start_addr =
+ get_unaligned_le32(&data[start_pos+16]);
+ chunk.chunk_info.version_number =
+ get_unaligned_le32(&data[start_pos+20]);
+ chunk.chunk_info.attribute =
+ get_unaligned_le32(&data[start_pos+24]);
+ chunk.chunk_info.temp =
+ get_unaligned_le32(&data[start_pos+28]);
+
+ memcpy(&fw_chunk_info->chunk_info,
+ &chunk.chunk_info,
+ sizeof(struct chunk_info));
+ fw_chunk_info->length = chunk.chunk_info.length;
+ fw_chunk_info->data = chunk.data;
+
+ is_found = 1;
+ } else
+ start_pos = start_pos + ck_size + 8;
+ }
+
+ if (is_found)
+ return 0;
+
+ return -ENODATA;
+}
+
+static int wdt87xx_get_sysparam(struct i2c_client *client)
+{
+ struct wdt87xx_ts_data *dev_wdt87xx =
+ (struct wdt87xx_ts_data *) i2c_get_clientdata(client);
+ struct sys_param *ctr_param = &dev_wdt87xx->param;
+ u8 buffer[PKT_READ_SIZE];
+ int err;
+
+ err = wdt87xx_get_string(client, STRIDX_PARAMETERS, buffer, 32);
+ if (err) {
+ dev_err(&client->dev, "get parameters error (%d)\n", err);
+ return err;
+ }
+
+ ctr_param->xmls_id1 =
+ get_unaligned_le16(buffer + CTL_PARAM_OFFSET_XMLS_ID1);
+ ctr_param->xmls_id2 =
+ get_unaligned_le16(buffer + CTL_PARAM_OFFSET_XMLS_ID2);
+ ctr_param->phy_ch_x =
+ get_unaligned_le16(buffer + CTL_PARAM_OFFSET_PHY_CH_X);
+ ctr_param->phy_ch_y =
+ get_unaligned_le16(buffer + CTL_PARAM_OFFSET_PHY_CH_Y);
+ ctr_param->phy_w =
+ (get_unaligned_le16(buffer + CTL_PARAM_OFFSET_PHY_W) / 10);
+ ctr_param->phy_h =
+ (get_unaligned_le16(buffer + CTL_PARAM_OFFSET_PHY_H) / 10);
+
+ err = wdt87xx_get_string(client, STRIDX_PLATFORM_ID, buffer, 8);
+ if (err) {
+ dev_err(&client->dev, "get platform id error (%d)\n", err);
+ return err;
+ }
+
+ ctr_param->plat_id = buffer[1];
+
+ buffer[0] = 0xf2;
+ err = wdt87xx_get_feature(client, buffer, 16);
+ if (err) {
+ dev_err(&client->dev, "get firmware id error (%d)\n", err);
+ return err;
+ }
+
+ if (buffer[0] != 0xf2) {
+ dev_err(&client->dev, "fw id packet error: %x\n", buffer[0]);
+ return -EINVAL;
+ }
+
+ ctr_param->fw_id = get_unaligned_le16(&buffer[1]);
+
+ if ((ctr_param->fw_id & 0xFFF) > 0x335)
+ dev_wdt87xx->packet_type = WDT_PKT_V1;
+ else
+ dev_wdt87xx->packet_type = WDT_PKT_V0;
+
+ dev_dbg(&client->dev,
+ "fw_id: 0x%x, plat_id: 0x%x\nxml_id1: %4x, xml_id2: %4x\n",
+ ctr_param->fw_id, ctr_param->plat_id,
+ ctr_param->xmls_id1, ctr_param->xmls_id2);
+
+ return 0;
+}
+
+static int process_fw_data(struct i2c_client *client,
+ const struct firmware *fw, struct format_chunk *wif_format_chunk)
+{
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+ struct chunk_info_ex fw_chunk_info;
+ int err;
+ u32 *u32_data;
+ u32 length;
+ u8 fw_id;
+ u8 chip_id;
+ u32 data1, data2;
+
+ u32_data = (u32 *) fw->data;
+ length = fw->size;
+
+ data1 = get_unaligned_le32(&u32_data[0]);
+ data2 = get_unaligned_le32(&u32_data[2]);
+ if (data1 != FOURCC_ID_RIFF || data2 != FOURCC_ID_WHIF) {
+ dev_err(&client->dev, "Check data tag failed !\n");
+ return -EINVAL;
+ }
+
+ /* the length should be equal */
+ data1 = get_unaligned_le32(&u32_data[1]);
+ if (data1 != length) {
+ dev_err(&client->dev, "Check data length failed !\n");
+ return -EINVAL;
+ }
+
+ wif_format_chunk->ck_id = get_unaligned_le32(&u32_data[3]);
+ wif_format_chunk->ck_size = get_unaligned_le32(&u32_data[4]);
+ wif_format_chunk->number_chunk = get_unaligned_le32(&u32_data[5]);
+ wif_format_chunk->enable_flag = get_unaligned_le32(&u32_data[6]);
+ wif_format_chunk->checksum = get_unaligned_le32(&u32_data[7]);
+ wif_format_chunk->temp1 = get_unaligned_le32(&u32_data[8]);
+ wif_format_chunk->temp2 = get_unaligned_le32(&u32_data[9]);
+
+ dev_dbg(&client->dev, "version checking\n");
+
+ /* get the version number from the firmware */
+ err = get_chunk_info(fw, CHUNK_ID_FRWR, &fw_chunk_info,
+ wif_format_chunk);
+ if (err) {
+ dev_err(&client->dev, "can not extract data !\n");
+ return -EBADR;
+ }
+
+ fw_id = ((fw_chunk_info.chunk_info.version_number >> 12) & 0xF);
+ chip_id = (((dev_wdt87xx->param.fw_id) >> 12) & 0xF);
+
+ if (fw_id != chip_id) {
+ dev_err(&client->dev, "FW is not match: fw(%d), chip(%d)\n",
+ fw_id, chip_id);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/* functions for the sysfs implementation */
+static int wdt87xx_check_firmware(struct chunk_info_ex *fw_chunk_info,
+ int ck_id)
+{
+ if (ck_id == CHUNK_ID_FRWR) {
+ u32 fw_id;
+
+ fw_id = get_unaligned_le32(fw_chunk_info->data);
+ if (fw_id == WDT_FIRMWARE_ID)
+ return 0;
+ else
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_set_feature(struct i2c_client *client, u8 *buf,
+ u32 buf_size)
+{
+ int err;
+ union req_data *req_data_set = (union req_data *) buf;
+ int data_len = 0;
+ /* for set/get packets used */
+ u8 xfer_buffer[PKT_WRITE_SIZE];
+
+ /* set feature command packet */
+ xfer_buffer[data_len++] = 0x22;
+ xfer_buffer[data_len++] = 0x00;
+ if (req_data_set->defined_data.report_id > 0xF) {
+ xfer_buffer[data_len++] = 0x30;
+ xfer_buffer[data_len++] = 0x03;
+ xfer_buffer[data_len++] = req_data_set->defined_data.report_id;
+ } else {
+ xfer_buffer[data_len++] = 0x30 |
+ req_data_set->defined_data.report_id;
+ xfer_buffer[data_len++] = 0x03;
+ }
+ xfer_buffer[data_len++] = 0x23;
+ xfer_buffer[data_len++] = 0x00;
+ xfer_buffer[data_len++] = (buf_size & 0xFF);
+ xfer_buffer[data_len++] = ((buf_size & 0xFF00) >> 8);
+
+ memcpy(&xfer_buffer[data_len], buf, buf_size);
+
+ err = wdt87xx_i2c_txdata(client, xfer_buffer, data_len + buf_size);
+
+ if (err < 0) {
+ dev_err(&client->dev, "error no: (%d)\n", err);
+ return err;
+ }
+
+ mdelay(2);
+
+ return 0;
+}
+
+static int wdt87xx_get_feature(struct i2c_client *client, u8 *buf,
+ u32 buf_size)
+{
+ int err;
+ u8 tx_buffer[8];
+ u8 xfer_buffer[PKT_WRITE_SIZE];
+ union req_data *req_data_get = (union req_data *) buf;
+ int data_len = 0;
+ u32 xfer_length = 0;
+
+ /* get feature command packet */
+ tx_buffer[data_len++] = 0x22;
+ tx_buffer[data_len++] = 0x00;
+ if (req_data_get->defined_data.report_id > 0xF) {
+ tx_buffer[data_len++] = 0x30;
+ tx_buffer[data_len++] = 0x02;
+ tx_buffer[data_len++] = req_data_get->defined_data.report_id;
+ } else {
+ tx_buffer[data_len++] = 0x30 |
+ req_data_get->defined_data.report_id;
+ tx_buffer[data_len++] = 0x02;
+ }
+ tx_buffer[data_len++] = 0x23;
+ tx_buffer[data_len++] = 0x00;
+
+ err = wdt87xx_i2c_txrxdata(client, tx_buffer, data_len, xfer_buffer,
+ buf_size + 2);
+
+ if (err < 0) {
+ dev_err(&client->dev, "error no: (%d)\n", err);
+ return err;
+ }
+
+ /* check size and copy the return data */
+ xfer_length = get_unaligned_le16(xfer_buffer);
+
+ if (buf_size < xfer_length)
+ xfer_length = buf_size;
+
+ memcpy(buf, &xfer_buffer[2], xfer_length);
+
+ mdelay(2);
+
+ return 0;
+}
+
+static int wdt87xx_get_string(struct i2c_client *client, u8 str_idx,
+ u8 *buf, u32 buf_size)
+{
+ int err;
+ u8 tx_buffer[8] = { 0x22, 0x00, 0x13, 0x0E,
+ 0x00, 0x23, 0x00, 0x00 };
+ u8 xfer_buffer[PKT_WRITE_SIZE];
+ u32 xfer_length;
+
+ tx_buffer[4] = str_idx;
+
+ err = wdt87xx_i2c_txrxdata(client, tx_buffer, 7, xfer_buffer,
+ buf_size + 2);
+
+ if (err < 0) {
+ dev_err(&client->dev, "error no: (%d)\n", err);
+ return err;
+ }
+
+ if (xfer_buffer[1] != 0x03) {
+ dev_err(&client->dev, "error str id: (%d)\n", xfer_buffer[1]);
+ return -EINVAL;
+ }
+
+ xfer_length = xfer_buffer[0];
+
+ if (buf_size < xfer_length)
+ xfer_length = buf_size;
+
+ memcpy(buf, &xfer_buffer[2], xfer_length);
+
+ mdelay(2);
+
+ return 0;
+}
+
+
+static int wdt87xx_send_command(struct i2c_client *client, int cmd, int value)
+{
+ union cmd_data cmd_data_send;
+
+ /* set the command packet */
+ cmd_data_send.defined_data.report_id = VND_REQ_WRITE;
+ cmd_data_send.defined_data.type = VND_SET_COMMAND_DATA;
+ put_unaligned_le16((u16) cmd,
+ &cmd_data_send.defined_data.index);
+
+ switch (cmd) {
+ case VND_CMD_START:
+ case VND_CMD_STOP:
+ case VND_CMD_RESET:
+ /* mode selector */
+ put_unaligned_le32((value & 0xFF),
+ &cmd_data_send.defined_data.length);
+ break;
+ case VND_CMD_SFLCK:
+ put_unaligned_le16(0xC39B, &cmd_data_send.buffer[3]);
+ break;
+ case VND_CMD_SFUNL:
+ put_unaligned_le16(0x95DA, &cmd_data_send.buffer[3]);
+ break;
+ case VND_CMD_ERASE:
+ case VND_SET_CHECKSUM_CALC:
+ case VND_SET_CHECKSUM_LENGTH:
+ put_unaligned_le32(value, &cmd_data_send.buffer[3]);
+ break;
+ default:
+ cmd_data_send.defined_data.report_id = 0;
+ dev_err(&client->dev, "Invalid command: (%d)", cmd);
+ return -EINVAL;
+ }
+
+ return wdt87xx_set_feature(client, &cmd_data_send.buffer[0],
+ sizeof(cmd_data_send));
+}
+
+static int wdt87xx_write_data(struct i2c_client *client,
+ const char *data, u32 address, int length)
+{
+ u32 addr_start, data_len;
+ u16 packet_size;
+ int count = 0;
+ int err;
+ union req_data req_data_set;
+ const char *source_data = 0;
+
+ source_data = data;
+ data_len = length;
+ addr_start = address;
+
+ /* address and length should be 4 bytes alignment */
+ if ((addr_start & 0x3) != 0 || (data_len & 0x3) != 0) {
+ dev_err(&client->dev, "addr & len must be aligned %x, %x\n",
+ addr_start, data_len);
+ return -EFAULT;
+ }
+
+ packet_size = PACKET_SIZE;
+
+ req_data_set.defined_data.report_id = VND_REQ_WRITE;
+ req_data_set.defined_data.type = VND_SET_DATA;
+
+ while (data_len) {
+ if (data_len < PACKET_SIZE)
+ packet_size = data_len;
+
+ put_unaligned_le16(packet_size,
+ &req_data_set.defined_data.index);
+ put_unaligned_le32(addr_start,
+ &req_data_set.defined_data.length);
+
+ memcpy(req_data_set.defined_data.data,
+ source_data, packet_size);
+
+ err = wdt87xx_set_feature(client, req_data_set.buffer, 64);
+
+ if (err)
+ break;
+
+ data_len = data_len - packet_size;
+ source_data = source_data + packet_size;
+ addr_start = addr_start + packet_size;
+
+ count++;
+
+ mdelay(4);
+
+ if ((count % 64) == 0) {
+ count = 0;
+ dev_dbg(&client->dev, "#");
+ }
+ }
+
+ dev_dbg(&client->dev, "#\n");
+
+ return err;
+}
+
+static u16 misr(u16 cur_value, u8 new_value)
+{
+ u32 a, b;
+ u32 bit0;
+ u32 y;
+
+ a = cur_value;
+ b = new_value;
+ bit0 = a^(b&1);
+ bit0 ^= a>>1;
+ bit0 ^= a>>2;
+ bit0 ^= a>>4;
+ bit0 ^= a>>5;
+ bit0 ^= a>>7;
+ bit0 ^= a>>11;
+ bit0 ^= a>>15;
+ y = (a<<1)^b;
+ y = (y&~1) | (bit0&1);
+
+ return (u16) y;
+}
+
+static int wdt87xx_get_checksum(struct i2c_client *client,
+ u32 *checksum, u32 address, int length)
+{
+ int err;
+ int time_delay;
+ union req_data req_data_get;
+ union cmd_data cmd_data_get;
+
+ err = wdt87xx_send_command(client, VND_SET_CHECKSUM_LENGTH, length);
+ if (err) {
+ dev_err(&client->dev, "set checksum length fail (%d)\n", err);
+ return err;
+ }
+
+ err = wdt87xx_send_command(client, VND_SET_CHECKSUM_CALC, address);
+ if (err) {
+ dev_err(&client->dev, "calc checksum fail (%d)\n", err);
+ return err;
+ }
+
+ time_delay = (length + 1023) / 1024;
+ /* to wait the operation compeletion */
+ msleep(time_delay * 10);
+
+ cmd_data_get.defined_data.report_id = VND_REQ_READ;
+ cmd_data_get.defined_data.type = VND_GET_CHECKSUM;
+ cmd_data_get.defined_data.index = 0;
+ cmd_data_get.defined_data.length = 0;
+
+ err = wdt87xx_set_feature(client, cmd_data_get.buffer, 8);
+ if (err) {
+ dev_err(&client->dev, "checksum set read fail (%d)\n", err);
+ return err;
+ }
+
+ memset(req_data_get.buffer, 0, 64);
+ req_data_get.defined_data.report_id = VND_READ_DATA;
+ err = wdt87xx_get_feature(client, req_data_get.buffer, 64);
+ if (err) {
+ dev_err(&client->dev, "read checksum fail (%d)\n", err);
+ return err;
+ }
+
+ *checksum = get_unaligned_le16(&req_data_get.buffer[8]);
+
+ return err;
+}
+
+static u16 fw_checksum(const u8 *data, u32 length)
+{
+ u32 i;
+ u16 checksum = 0;
+
+ checksum = 0x0000;
+
+ for (i = 0; i < length; i++)
+ checksum = misr(checksum, data[i]);
+
+ return checksum;
+}
+
+static int wdt87xx_write_firmware(struct i2c_client *client,
+ struct chunk_info_ex *fw_chunk_info, int type)
+{
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+ int err;
+ int err1;
+ int size;
+ int start_addr;
+ int page_size;
+ int retry_count = 0;
+ int is_equal = 0;
+ int max_retries;
+ u32 calc_checksum = 0;
+ u32 read_checksum = 0;
+ const char *data;
+
+ dev_info(&client->dev, "start 4k page program\n");
+
+ err = wdt87xx_send_command(client, VND_CMD_STOP, MODE_STOP);
+ if (err) {
+ dev_err(&client->dev, "command stop fail (%d)\n", err);
+ return err;
+ }
+
+ err = wdt87xx_send_command(client, VND_CMD_SFUNL, 0);
+ if (err) {
+ dev_err(&client->dev, "command sfunl fail (%d)\n", err);
+ goto write_fail;
+ }
+
+ mdelay(10);
+
+ start_addr = fw_chunk_info->chunk_info.target_start_addr;
+ size = fw_chunk_info->chunk_info.length;
+ data = fw_chunk_info->data;
+
+ max_retries = dev_wdt87xx->max_retries;
+
+ dev_info(&client->dev, "%x, %x, %d\n", start_addr, size, max_retries);
+
+ while (size && !err) {
+ is_equal = 0;
+ if (size > PG_SIZE) {
+ page_size = PG_SIZE;
+ size = size - PG_SIZE;
+ } else {
+ page_size = size;
+ size = 0;
+ }
+
+ for (retry_count = 0; retry_count < max_retries && !is_equal;
+ retry_count++) {
+ err = wdt87xx_send_command(client, VND_CMD_ERASE,
+ start_addr);
+ if (err) {
+ dev_err(&client->dev, "erase fail (%d)\n",
+ err);
+ break;
+ }
+
+ msleep(50);
+
+ err = wdt87xx_write_data(client, data, start_addr,
+ page_size);
+ if (err) {
+ dev_err(&client->dev, "write data fail (%d)\n",
+ err);
+ break;
+ }
+
+ read_checksum = 0;
+ err = wdt87xx_get_checksum(client, &read_checksum,
+ start_addr, page_size);
+ if (err)
+ break;
+
+ calc_checksum = fw_checksum(data, page_size);
+
+ if (read_checksum == calc_checksum)
+ is_equal = 1;
+ else
+ dev_err(&client->dev,
+ "csum fail: (%d), (%d), (%d)\n",
+ retry_count,
+ read_checksum, calc_checksum);
+ }
+
+ if (retry_count == MAX_RETRIES) {
+ dev_err(&client->dev, "write page fail\n");
+ err = -EIO;
+ }
+
+ start_addr = start_addr + page_size;
+ data = data + page_size;
+ dev_info(&client->dev, "%x, %x\n", start_addr, size);
+ }
+write_fail:
+ err1 = wdt87xx_send_command(client, VND_CMD_SFLCK, 0);
+ if (err1)
+ dev_err(&client->dev, "command sflck fail (%d)\n", err1);
+
+ mdelay(10);
+
+ err1 = wdt87xx_send_command(client, VND_CMD_START, 0);
+ if (err1)
+ dev_err(&client->dev, "command start fail (%d)\n", err1);
+
+ dev_info(&client->dev, "stop 4k page program : ");
+
+ if (err || err1)
+ dev_info(&client->dev, "fail\n");
+ else
+ dev_info(&client->dev, "pass\n");
+
+ if (err1)
+ return err1;
+
+ return err;
+}
+
+static int wdt87xx_sw_reset(struct i2c_client *client)
+{
+ int err;
+
+ dev_info(&client->dev, "reset device now\n");
+
+ err = wdt87xx_send_command(client, VND_CMD_RESET, 0);
+ if (err) {
+ dev_err(&client->dev, "command reset fail (%d)\n", err);
+ return err;
+ }
+
+ /* wait the device to be ready */
+ msleep(200);
+
+ return 0;
+}
+
+static int wdt87xx_load_chunk(struct i2c_client *client,
+ const struct firmware *fw,
+ struct format_chunk *wif_format_chunk, u32 ck_id)
+{
+ int err;
+ struct chunk_info_ex fw_chunk_info;
+
+ err = get_chunk_info(fw, ck_id, &fw_chunk_info, wif_format_chunk);
+ if (err) {
+ dev_err(&client->dev, "can not get the fw !\n");
+ goto failed;
+ }
+
+ /* Check for incorrect bin file */
+ err = wdt87xx_check_firmware(&fw_chunk_info, ck_id);
+ if (err) {
+ dev_err(&client->dev, "invalid chunk : (%d)\n", ck_id);
+ goto failed;
+ }
+
+ err = wdt87xx_write_firmware(client, &fw_chunk_info, ck_id);
+ if (err)
+ dev_err(&client->dev, "write firmware failed : (%d)\n",
+ ck_id);
+
+failed:
+ return err;
+}
+
+static int wdt87xx_load_fw(struct device *dev, const char *fn,
+ u8 type)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ const struct firmware *fw = 0;
+ int err;
+
+ struct format_chunk wif_format_chunk;
+
+ err = request_firmware(&fw, fn, dev);
+ if (err) {
+ dev_err(&client->dev, "unable to open firmware %s\n", fn);
+ return err;
+ }
+
+ disable_irq(client->irq);
+
+ err = process_fw_data(client, fw, &wif_format_chunk);
+ if (err) {
+ dev_err(&client->dev, "bad fw file !\n");
+ goto release_firmware;
+ }
+
+ if (type & WDT87XX_FW) {
+ err = wdt87xx_load_chunk(client, fw, &wif_format_chunk,
+ CHUNK_ID_FRWR);
+ if (err) {
+ dev_err(&client->dev, "load fw chunk failed !\n");
+ goto release_firmware;
+ }
+ }
+
+ if (type & WDT87XX_CFG) {
+ err = wdt87xx_load_chunk(client, fw, &wif_format_chunk,
+ CHUNK_ID_CNFG);
+ if (err) {
+ dev_err(&client->dev, "load cfg chunk failed !\n");
+ goto release_firmware;
+ }
+ }
+
+ err = wdt87xx_sw_reset(client);
+ if (err)
+ dev_err(&client->dev, "software reset failed !\n");
+
+ /* refresh the parameters */
+ wdt87xx_get_sysparam(client);
+release_firmware:
+ enable_irq(client->irq);
+ mdelay(10);
+
+ release_firmware(fw);
+ return err;
+}
+
+static ssize_t wdt87xx_update_fw(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+ int err;
+ u8 option = 0;
+
+ if (count <= 0)
+ return -EINVAL;
+
+ err = kstrtou8(buf, 0, &option);
+ if (err)
+ return err;
+
+ dev_info(dev, "update option (%d)\n", option);
+ if (option < 1 || option > 3) {
+ dev_err(&client->dev, "option is not supported\n");
+ return -1;
+ }
+
+ err = mutex_lock_interruptible(&dev_wdt87xx->sysfs_mutex);
+ if (err)
+ return err;
+
+ err = wdt87xx_load_fw(dev, WDT87XX_FW_NAME, option);
+ if (err) {
+ dev_err(&client->dev, "the firmware update failed(%d)\n",
+ err);
+ count = err;
+ }
+
+ mutex_unlock(&dev_wdt87xx->sysfs_mutex);
+
+ return count;
+}
+
+static ssize_t wdt87xx_fw_version(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", dev_wdt87xx->param.fw_id);
+}
+
+static ssize_t wdt87xx_plat_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", dev_wdt87xx->param.plat_id);
+}
+
+static ssize_t wdt87xx_config_csum(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_ts_data *dev_wdt87xx = i2c_get_clientdata(client);
+ u32 cfg_csum;
+
+ cfg_csum = dev_wdt87xx->param.xmls_id1;
+ cfg_csum = (cfg_csum << 16) | dev_wdt87xx->param.xmls_id2;
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", cfg_csum);
+}
+
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, wdt87xx_update_fw);
+static DEVICE_ATTR(fw_version, S_IRUGO, wdt87xx_fw_version, NULL);
+static DEVICE_ATTR(plat_id, S_IRUGO, wdt87xx_plat_id, NULL);
+static DEVICE_ATTR(config_csum, S_IRUGO, wdt87xx_config_csum, NULL);
+
+static struct attribute *wdt87xx_attrs[] = {
+ &dev_attr_update_fw.attr,
+ &dev_attr_fw_version.attr,
+ &dev_attr_plat_id.attr,
+ &dev_attr_config_csum.attr,
+ NULL
+};
+
+static const struct attribute_group wdt87xx_attr_group = {
+ .attrs = wdt87xx_attrs,
+};
+
+static int wdt87xx_i2c_txrxdata(struct i2c_client *client,
+ char *txdata, int txlen, char *rxdata, int rxlen)
+{
+ int err;
+
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = txlen,
+ .buf = txdata,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = rxlen,
+ .buf = rxdata,
+ },
+ };
+
+ err = i2c_transfer(client->adapter, msgs, 2);
+
+ if (err < 0)
+ dev_err(&client->dev, "%s: i2c read error (%d)\n",
+ __func__, err);
+
+ return err < 0 ? err : (err != ARRAY_SIZE(msgs) ? -EIO : 0);
+}
+
+static int wdt87xx_i2c_rxdata(struct i2c_client *client,
+ char *rxdata, int length)
+{
+ int err;
+
+ err = i2c_master_recv(client, rxdata, length);
+
+ if (err < 0)
+ dev_err(&client->dev, "%s: i2c read error (%d)\n",
+ __func__, err);
+
+ return err;
+}
+
+static int wdt87xx_i2c_txdata(struct i2c_client *client,
+ char *txdata, int length)
+{
+ int err;
+
+ err = i2c_master_send(client, txdata, length);
+ if (err < 0)
+ dev_err(&client->dev, "%s: i2c write error (%d)\n",
+ __func__, err);
+
+ return err;
+}
+
+static irqreturn_t wdt87xx_ts_interrupt(int irq, void *dev_id)
+{
+ struct wdt87xx_ts_data *dev_wdt87xx =
+ (struct wdt87xx_ts_data *) dev_id;
+ int err;
+ int i, points;
+ struct i2c_client *client = dev_wdt87xx->client;
+ u8 raw_buf[WDT_V1_RAW_BUF_COUNT] = {0};
+ u8 *ptr_raw_buf = 0;
+
+ err = wdt87xx_i2c_rxdata(client, raw_buf, WDT_V1_RAW_BUF_COUNT);
+
+ if (err < 0) {
+ dev_err(&client->dev, "read v1 raw data fail (%d)\n", err);
+ goto irq_exit;
+ }
+
+ /* touch finger count */
+ points = raw_buf[TOUCH_PK_V1_OFFSET_FNGR_NUM];
+
+ dev_dbg(&client->dev, "point: (%d)\n", points);
+
+ /* skip this packet */
+ if (points == 0)
+ goto irq_exit;
+
+ dev_dbg(&client->dev, "+++++++++\n");
+
+ ptr_raw_buf = &raw_buf[TOUCH_PK_V1_OFFSET_EVENT];
+ for (i = 0; i < WDT_MAX_FINGER; i++) {
+ int point_id = (*ptr_raw_buf >> 3) - 1;
+
+ /* something wrong */
+ if (point_id < 0)
+ break;
+
+ if (*ptr_raw_buf & 0x1) {
+ u32 point_x, point_y;
+ u8 w, h, p;
+ u16 value;
+
+ w = *(ptr_raw_buf + FINGER_EV_V1_OFFSET_W);
+ h = *(ptr_raw_buf + FINGER_EV_V1_OFFSET_H);
+ value = w * h;
+ p = (value >> 2);
+
+ point_x = get_unaligned_le16(ptr_raw_buf +
+ FINGER_EV_V1_OFFSET_X);
+ point_y = get_unaligned_le16(ptr_raw_buf +
+ FINGER_EV_V1_OFFSET_Y);
+
+ point_y = DIV_ROUND_CLOSEST(point_y *
+ dev_wdt87xx->param.phy_h,
+ dev_wdt87xx->param.phy_w);
+
+ /* incorrect coordinate */
+ if (point_x > dev_wdt87xx->max_x ||
+ point_y > dev_wdt87xx->max_y)
+ break;
+
+ dev_dbg(&client->dev, "tip on (%d), x(%d), y(%d)\n",
+ i, point_x, point_y);
+
+ input_mt_slot(dev_wdt87xx->input_dev, point_id);
+ input_mt_report_slot_state(dev_wdt87xx->input_dev,
+ MT_TOOL_FINGER, 1);
+ input_report_abs(dev_wdt87xx->input_dev,
+ ABS_MT_TOUCH_MAJOR, w);
+ input_report_abs(dev_wdt87xx->input_dev,
+ ABS_MT_PRESSURE, p);
+ input_report_abs(dev_wdt87xx->input_dev,
+ ABS_MT_POSITION_X, point_x);
+ input_report_abs(dev_wdt87xx->input_dev,
+ ABS_MT_POSITION_Y, point_y);
+ }
+ ptr_raw_buf += FINGER_EV_V1_SIZE;
+ }
+
+ input_mt_sync_frame(dev_wdt87xx->input_dev);
+ input_sync(dev_wdt87xx->input_dev);
+
+irq_exit:
+ return IRQ_HANDLED;
+}
+
+static int wdt87xx_ts_request_irq(struct i2c_client *client)
+{
+ int err;
+ struct wdt87xx_ts_data *dev_wdt87xx;
+
+ dev_wdt87xx = i2c_get_clientdata(client);
+
+ err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+ wdt87xx_ts_interrupt, IRQF_ONESHOT, client->name, dev_wdt87xx);
+
+ if (err < 0) {
+ dev_err(&client->dev, "%s: request threaded irq fail (%d)\n",
+ __func__, err);
+ return err;
+ }
+
+ disable_irq_nosync(client->irq);
+
+ return 0;
+}
+
+static int wdt87xx_ts_create_input_device(struct i2c_client *client)
+{
+ int err;
+ struct wdt87xx_ts_data *dev_wdt87xx;
+ struct input_dev *input_dev;
+ u32 resolution;
+
+ dev_wdt87xx = (struct wdt87xx_ts_data *) i2c_get_clientdata(client);
+
+ input_dev = devm_input_allocate_device(&client->dev);
+ if (!input_dev) {
+ dev_err(&client->dev, "%s: failed to allocate input device\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ dev_wdt87xx->input_dev = input_dev;
+
+ dev_wdt87xx->max_x = MAX_UNIT_AXIS;
+ dev_wdt87xx->max_y = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS *
+ dev_wdt87xx->param.phy_h, dev_wdt87xx->param.phy_w);
+
+ resolution = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS, dev_wdt87xx->param.phy_w);
+
+ input_dev->name = "WDT87xx Touchscreen";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->phys = dev_wdt87xx->phys;
+ input_dev->dev.parent = &dev_wdt87xx->client->dev;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __set_bit(BTN_TOUCH, input_dev->keybit);
+
+ /* for single touch */
+ input_set_abs_params(input_dev, ABS_X, 0, dev_wdt87xx->max_x, 0, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, dev_wdt87xx->max_y, 0, 0);
+ input_abs_set_res(input_dev, ABS_X, resolution);
+ input_abs_set_res(input_dev, ABS_Y, resolution);
+
+ input_mt_init_slots(input_dev, WDT_MAX_FINGER,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
+ dev_wdt87xx->max_x, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
+ dev_wdt87xx->max_y, 0, 0);
+ input_abs_set_res(input_dev, ABS_MT_POSITION_X, resolution);
+ input_abs_set_res(input_dev, ABS_MT_POSITION_Y, resolution);
+
+ input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 0xFF, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 0xFF, 0, 0);
+
+ err = input_register_device(input_dev);
+ if (err) {
+ dev_err(&client->dev, "register input device fail (%d)\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wdt87xx_ts_data *dev_wdt87xx;
+ int err;
+
+ dev_info(&client->dev, "wdt87xx : adapter=(%d), client irq:(%d)\n",
+ client->adapter->nr, client->irq);
+
+ /* check if the I2C function is ok in this adaptor */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
+
+ dev_dbg(&client->dev, "kzalloc\n");
+ dev_wdt87xx = devm_kzalloc(&client->dev,
+ sizeof(struct wdt87xx_ts_data), GFP_KERNEL);
+ if (!dev_wdt87xx)
+ return -ENOMEM;
+
+ dev_dbg(&client->dev, "i2c_set_clientdata\n");
+
+ dev_wdt87xx->client = client;
+ mutex_init(&dev_wdt87xx->sysfs_mutex);
+ i2c_set_clientdata(client, dev_wdt87xx);
+ dev_wdt87xx->max_retries = MAX_RETRIES;
+ snprintf(dev_wdt87xx->phys, sizeof(dev_wdt87xx->phys),
+ "i2c-%u-%04x/input0", client->adapter->nr, client->addr);
+
+ wdt87xx_get_sysparam(client);
+
+ dev_dbg(&client->dev, "wdt87xx_ts_create_input_device\n");
+ err = wdt87xx_ts_create_input_device(client);
+ if (err < 0) {
+ dev_err(&client->dev, "create input device fail (%d)\n", err);
+ return err;
+ }
+
+ dev_dbg(&client->dev, "wdt87xx_ts_request_irq\n");
+ err = wdt87xx_ts_request_irq(client);
+ if (err < 0) {
+ dev_err(&client->dev, "request irq fail (%d)\n", err);
+ return err;
+ }
+
+ dev_dbg(&client->dev, "sysfs_create_group\n");
+ err = sysfs_create_group(&client->dev.kobj, &wdt87xx_attr_group);
+ if (err) {
+ dev_err(&client->dev, "create sysfs fail (%d)\n", err);
+ return err;
+ }
+ enable_irq(client->irq);
+ dev_dbg(&client->dev, "%s leave\n", __func__);
+
+ return 0;
+}
+
+static int wdt87xx_ts_remove(struct i2c_client *client)
+{
+ dev_dbg(&client->dev, "==%s==\n", __func__);
+
+ sysfs_remove_group(&client->dev.kobj, &wdt87xx_attr_group);
+
+ return 0;
+}
+
+static int __maybe_unused wdt87xx_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int err;
+
+ dev_dbg(&client->dev, "enter %s\n", __func__);
+
+ disable_irq(client->irq);
+
+ err = wdt87xx_send_command(client, VND_CMD_STOP, MODE_IDLE);
+ if (err)
+ dev_err(&client->dev, "%s: command stop fail (%d)\n",
+ __func__, err);
+
+ return err;
+}
+
+static int __maybe_unused wdt87xx_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int err;
+
+ /* once the chip is reset before resume, */
+ /* we need some time to wait it is stable */
+ mdelay(100);
+
+ err = wdt87xx_send_command(client, VND_CMD_START, 0);
+ if (err)
+ dev_err(&client->dev, "%s: command start fail (%d)\n",
+ __func__, err);
+
+ enable_irq(client->irq);
+
+ dev_dbg(&client->dev, "leave %s\n", __func__);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(wdt87xx_pm_ops, wdt87xx_suspend, wdt87xx_resume);
+
+static const struct i2c_device_id wdt87xx_dev_id[] = {
+ { WDT87XX_NAME, 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, wdt87xx_dev_id);
+
+static const struct acpi_device_id wdt87xx_acpi_id[] = {
+ { "WDHT0001", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(acpi, wdt87xx_acpi_id);
+
+static struct i2c_driver wdt87xx_driver = {
+ .probe = wdt87xx_ts_probe,
+ .remove = wdt87xx_ts_remove,
+ .id_table = wdt87xx_dev_id,
+ .driver = {
+ .name = WDT87XX_NAME,
+ .owner = THIS_MODULE,
+ .pm = &wdt87xx_pm_ops,
+ .acpi_match_table = ACPI_PTR(wdt87xx_acpi_id),
+ },
+};
+
+module_i2c_driver(wdt87xx_driver);
+
+MODULE_AUTHOR("HN Chen <hn.chen@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("WeidaHiTech WDT87XX Touchscreen driver");
+MODULE_VERSION(WDT87XX_DRV_VER);
+MODULE_LICENSE("GPL");
+
--
1.9.1
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