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authorHungNien Chen <hn.chen@weidahitech.com>2015-06-15 18:57:08 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2015-06-24 14:55:54 -0700
commit3e30c11c8a902de350281a0d821e17cdb45ef156 (patch)
treeaffd8ee0eee5970bbe5ce71696091a9a0ffdd160 /drivers/input/touchscreen/wdt87xx_i2c.c
parentInput: axp20x-pek - fix reporting button state as inverted (diff)
downloadlinux-dev-3e30c11c8a902de350281a0d821e17cdb45ef156.tar.xz
linux-dev-3e30c11c8a902de350281a0d821e17cdb45ef156.zip
Input: add a driver for wdt87xx touchscreen controller
This is a driver for Weida HiTech WDT87xx series touchscreen controller. Signed-off-by: HungNien Chen <hn.chen@weidahitech.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen/wdt87xx_i2c.c')
-rw-r--r--drivers/input/touchscreen/wdt87xx_i2c.c1140
1 files changed, 1140 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wdt87xx_i2c.c b/drivers/input/touchscreen/wdt87xx_i2c.c
new file mode 100644
index 000000000000..c073ea9345e2
--- /dev/null
+++ b/drivers/input/touchscreen/wdt87xx_i2c.c
@@ -0,0 +1,1140 @@
+/*
+ * Weida HiTech WDT87xx TouchScreen I2C driver
+ *
+ * Copyright (c) 2015 Weida Hi-Tech Co., Ltd.
+ * HN Chen <hn.chen@weidahitech.com>
+ *
+ * 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.
+ */
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/firmware.h>
+#include <linux/input/mt.h>
+#include <linux/acpi.h>
+#include <asm/unaligned.h>
+
+#define WDT87XX_NAME "wdt87xx_i2c"
+#define WDT87XX_DRV_VER "0.9.5"
+#define WDT87XX_FW_NAME "wdt87xx_fw.bin"
+#define WDT87XX_CFG_NAME "wdt87xx_cfg.bin"
+
+#define MODE_ACTIVE 0x01
+#define MODE_READY 0x02
+#define MODE_IDLE 0x03
+#define MODE_SLEEP 0x04
+#define MODE_STOP 0xFF
+
+#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 finger definition of the report event */
+#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_P 2
+#define FINGER_EV_V1_OFFSET_X 3
+#define FINGER_EV_V1_OFFSET_Y 5
+#define FINGER_EV_V1_SIZE 7
+
+/* The definition of a report 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 of 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
+
+/* Communication 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 CMD_SFLCK_KEY 0xC39B
+#define CMD_SFUNL_KEY 0x95DA
+
+#define STRIDX_PLATFORM_ID 0x80
+#define STRIDX_PARAMETERS 0x81
+
+#define CMD_BUF_SIZE 8
+#define PKT_BUF_SIZE 64
+
+/* The definition of the command packet */
+#define CMD_REPORT_ID_OFFSET 0x0
+#define CMD_TYPE_OFFSET 0x1
+#define CMD_INDEX_OFFSET 0x2
+#define CMD_KEY_OFFSET 0x3
+#define CMD_LENGTH_OFFSET 0x4
+#define CMD_DATA_OFFSET 0x8
+
+/* 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
+
+#define FW_FOURCC1_OFFSET 0
+#define FW_SIZE_OFFSET 4
+#define FW_FOURCC2_OFFSET 8
+#define FW_PAYLOAD_OFFSET 40
+
+#define FW_CHUNK_ID_OFFSET 0
+#define FW_CHUNK_SIZE_OFFSET 4
+#define FW_CHUNK_TGT_START_OFFSET 8
+#define FW_CHUNK_PAYLOAD_LEN_OFFSET 12
+#define FW_CHUNK_SRC_START_OFFSET 16
+#define FW_CHUNK_VERSION_OFFSET 20
+#define FW_CHUNK_ATTR_OFFSET 24
+#define FW_CHUNK_PAYLOAD_OFFSET 32
+
+/* Controller requires minimum 300us between commands */
+#define WDT_COMMAND_DELAY_MS 2
+#define WDT_FLASH_WRITE_DELAY_MS 4
+
+struct wdt87xx_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;
+ u32 max_x;
+ u32 max_y;
+};
+
+struct wdt87xx_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ /* Mutex for fw update to prevent concurrent access */
+ struct mutex fw_mutex;
+ struct wdt87xx_sys_param param;
+ u8 phys[32];
+};
+
+static int wdt87xx_i2c_xfer(struct i2c_client *client,
+ void *txdata, size_t txlen,
+ void *rxdata, size_t rxlen)
+{
+ struct i2c_msg msgs[] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = txlen,
+ .buf = txdata,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = rxlen,
+ .buf = rxdata,
+ },
+ };
+ int error;
+ int ret;
+
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret != ARRAY_SIZE(msgs)) {
+ error = ret < 0 ? ret : -EIO;
+ dev_err(&client->dev, "%s: i2c transfer failed: %d\n",
+ __func__, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_get_string(struct i2c_client *client, u8 str_idx,
+ u8 *buf, size_t len)
+{
+ u8 tx_buf[] = { 0x22, 0x00, 0x13, 0x0E, str_idx, 0x23, 0x00 };
+ u8 rx_buf[PKT_WRITE_SIZE];
+ size_t rx_len = len + 2;
+ int error;
+
+ if (rx_len > sizeof(rx_buf))
+ return -EINVAL;
+
+ error = wdt87xx_i2c_xfer(client, tx_buf, sizeof(tx_buf),
+ rx_buf, rx_len);
+ if (error) {
+ dev_err(&client->dev, "get string failed: %d\n", error);
+ return error;
+ }
+
+ if (rx_buf[1] != 0x03) {
+ dev_err(&client->dev, "unexpected response to get string: %d\n",
+ rx_buf[1]);
+ return -EINVAL;
+ }
+
+ rx_len = min_t(size_t, len, rx_buf[0]);
+ memcpy(buf, &rx_buf[2], rx_len);
+
+ mdelay(WDT_COMMAND_DELAY_MS);
+
+ return 0;
+}
+
+static int wdt87xx_get_feature(struct i2c_client *client,
+ u8 *buf, size_t buf_size)
+{
+ u8 tx_buf[8];
+ u8 rx_buf[PKT_WRITE_SIZE];
+ size_t tx_len = 0;
+ size_t rx_len = buf_size + 2;
+ int error;
+
+ if (rx_len > sizeof(rx_buf))
+ return -EINVAL;
+
+ /* Get feature command packet */
+ tx_buf[tx_len++] = 0x22;
+ tx_buf[tx_len++] = 0x00;
+ if (buf[CMD_REPORT_ID_OFFSET] > 0xF) {
+ tx_buf[tx_len++] = 0x30;
+ tx_buf[tx_len++] = 0x02;
+ tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET];
+ } else {
+ tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET];
+ tx_buf[tx_len++] = 0x02;
+ }
+ tx_buf[tx_len++] = 0x23;
+ tx_buf[tx_len++] = 0x00;
+
+ error = wdt87xx_i2c_xfer(client, tx_buf, tx_len, rx_buf, rx_len);
+ if (error) {
+ dev_err(&client->dev, "get feature failed: %d\n", error);
+ return error;
+ }
+
+ rx_len = min_t(size_t, buf_size, get_unaligned_le16(rx_buf));
+ memcpy(buf, &rx_buf[2], rx_len);
+
+ mdelay(WDT_COMMAND_DELAY_MS);
+
+ return 0;
+}
+
+static int wdt87xx_set_feature(struct i2c_client *client,
+ const u8 *buf, size_t buf_size)
+{
+ u8 tx_buf[PKT_WRITE_SIZE];
+ int tx_len = 0;
+ int error;
+
+ /* Set feature command packet */
+ tx_buf[tx_len++] = 0x22;
+ tx_buf[tx_len++] = 0x00;
+ if (buf[CMD_REPORT_ID_OFFSET] > 0xF) {
+ tx_buf[tx_len++] = 0x30;
+ tx_buf[tx_len++] = 0x03;
+ tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET];
+ } else {
+ tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET];
+ tx_buf[tx_len++] = 0x03;
+ }
+ tx_buf[tx_len++] = 0x23;
+ tx_buf[tx_len++] = 0x00;
+ tx_buf[tx_len++] = (buf_size & 0xFF);
+ tx_buf[tx_len++] = ((buf_size & 0xFF00) >> 8);
+
+ if (tx_len + buf_size > sizeof(tx_buf))
+ return -EINVAL;
+
+ memcpy(&tx_buf[tx_len], buf, buf_size);
+ tx_len += buf_size;
+
+ error = i2c_master_send(client, tx_buf, tx_len);
+ if (error < 0) {
+ dev_err(&client->dev, "set feature failed: %d\n", error);
+ return error;
+ }
+
+ mdelay(WDT_COMMAND_DELAY_MS);
+
+ return 0;
+}
+
+static int wdt87xx_send_command(struct i2c_client *client, int cmd, int value)
+{
+ u8 cmd_buf[CMD_BUF_SIZE];
+
+ /* Set the command packet */
+ cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE;
+ cmd_buf[CMD_TYPE_OFFSET] = VND_SET_COMMAND_DATA;
+ put_unaligned_le16((u16)cmd, &cmd_buf[CMD_INDEX_OFFSET]);
+
+ switch (cmd) {
+ case VND_CMD_START:
+ case VND_CMD_STOP:
+ case VND_CMD_RESET:
+ /* Mode selector */
+ put_unaligned_le32((value & 0xFF), &cmd_buf[CMD_LENGTH_OFFSET]);
+ break;
+
+ case VND_CMD_SFLCK:
+ put_unaligned_le16(CMD_SFLCK_KEY, &cmd_buf[CMD_KEY_OFFSET]);
+ break;
+
+ case VND_CMD_SFUNL:
+ put_unaligned_le16(CMD_SFUNL_KEY, &cmd_buf[CMD_KEY_OFFSET]);
+ break;
+
+ case VND_CMD_ERASE:
+ case VND_SET_CHECKSUM_CALC:
+ case VND_SET_CHECKSUM_LENGTH:
+ put_unaligned_le32(value, &cmd_buf[CMD_KEY_OFFSET]);
+ break;
+
+ default:
+ cmd_buf[CMD_REPORT_ID_OFFSET] = 0;
+ dev_err(&client->dev, "Invalid command: %d\n", cmd);
+ return -EINVAL;
+ }
+
+ return wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf));
+}
+
+static int wdt87xx_sw_reset(struct i2c_client *client)
+{
+ int error;
+
+ dev_dbg(&client->dev, "resetting device now\n");
+
+ error = wdt87xx_send_command(client, VND_CMD_RESET, 0);
+ if (error) {
+ dev_err(&client->dev, "reset failed\n");
+ return error;
+ }
+
+ /* Wait the device to be ready */
+ msleep(200);
+
+ return 0;
+}
+
+static const void *wdt87xx_get_fw_chunk(const struct firmware *fw, u32 id)
+{
+ size_t pos = FW_PAYLOAD_OFFSET;
+ u32 chunk_id, chunk_size;
+
+ while (pos < fw->size) {
+ chunk_id = get_unaligned_le32(fw->data +
+ pos + FW_CHUNK_ID_OFFSET);
+ if (chunk_id == id)
+ return fw->data + pos;
+
+ chunk_size = get_unaligned_le32(fw->data +
+ pos + FW_CHUNK_SIZE_OFFSET);
+ pos += chunk_size + 2 * sizeof(u32); /* chunk ID + size */
+ }
+
+ return NULL;
+}
+
+static int wdt87xx_get_sysparam(struct i2c_client *client,
+ struct wdt87xx_sys_param *param)
+{
+ u8 buf[PKT_READ_SIZE];
+ int error;
+
+ error = wdt87xx_get_string(client, STRIDX_PARAMETERS, buf, 32);
+ if (error) {
+ dev_err(&client->dev, "failed to get parameters\n");
+ return error;
+ }
+
+ param->xmls_id1 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID1);
+ param->xmls_id2 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID2);
+ param->phy_ch_x = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_X);
+ param->phy_ch_y = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_Y);
+ param->phy_w = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_W) / 10;
+ param->phy_h = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_H) / 10;
+
+ param->max_x = MAX_UNIT_AXIS;
+ param->max_y = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS * param->phy_h,
+ param->phy_w);
+
+ error = wdt87xx_get_string(client, STRIDX_PLATFORM_ID, buf, 8);
+ if (error) {
+ dev_err(&client->dev, "failed to get platform id\n");
+ return error;
+ }
+
+ param->plat_id = buf[1];
+
+ buf[0] = 0xf2;
+ error = wdt87xx_get_feature(client, buf, 16);
+ if (error) {
+ dev_err(&client->dev, "failed to get firmware id\n");
+ return error;
+ }
+
+ if (buf[0] != 0xf2) {
+ dev_err(&client->dev, "wrong id of fw response: 0x%x\n",
+ buf[0]);
+ return -EINVAL;
+ }
+
+ param->fw_id = get_unaligned_le16(&buf[1]);
+
+ dev_info(&client->dev,
+ "fw_id: 0x%x, plat_id: 0x%x\nxml_id1: %04x, xml_id2: %04x\n",
+ param->fw_id, param->plat_id,
+ param->xmls_id1, param->xmls_id2);
+
+ return 0;
+}
+
+static int wdt87xx_validate_firmware(struct wdt87xx_data *wdt,
+ const struct firmware *fw)
+{
+ const void *fw_chunk;
+ u32 data1, data2;
+ u32 size;
+ u8 fw_chip_id;
+ u8 chip_id;
+
+ data1 = get_unaligned_le32(fw->data + FW_FOURCC1_OFFSET);
+ data2 = get_unaligned_le32(fw->data + FW_FOURCC2_OFFSET);
+ if (data1 != FOURCC_ID_RIFF || data2 != FOURCC_ID_WHIF) {
+ dev_err(&wdt->client->dev, "check fw tag failed\n");
+ return -EINVAL;
+ }
+
+ size = get_unaligned_le32(fw->data + FW_SIZE_OFFSET);
+ if (size != fw->size) {
+ dev_err(&wdt->client->dev,
+ "fw size mismatch: expected %d, actual %zd\n",
+ size, fw->size);
+ return -EINVAL;
+ }
+
+ /*
+ * Get the chip_id from the firmware. Make sure that it is the
+ * right controller to do the firmware and config update.
+ */
+ fw_chunk = wdt87xx_get_fw_chunk(fw, CHUNK_ID_FRWR);
+ if (!fw_chunk) {
+ dev_err(&wdt->client->dev,
+ "unable to locate firmware chunk\n");
+ return -EINVAL;
+ }
+
+ fw_chip_id = (get_unaligned_le32(fw_chunk +
+ FW_CHUNK_VERSION_OFFSET) >> 12) & 0xF;
+ chip_id = (wdt->param.fw_id >> 12) & 0xF;
+
+ if (fw_chip_id != chip_id) {
+ dev_err(&wdt->client->dev,
+ "fw version mismatch: fw %d vs. chip %d\n",
+ fw_chip_id, chip_id);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_validate_fw_chunk(const void *data, int id)
+{
+ if (id == CHUNK_ID_FRWR) {
+ u32 fw_id;
+
+ fw_id = get_unaligned_le32(data + FW_CHUNK_PAYLOAD_OFFSET);
+ if (fw_id != WDT_FIRMWARE_ID)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_write_data(struct i2c_client *client, const char *data,
+ u32 address, int length)
+{
+ u16 packet_size;
+ int count = 0;
+ int error;
+ u8 pkt_buf[PKT_BUF_SIZE];
+
+ /* Address and length should be 4 bytes aligned */
+ if ((address & 0x3) != 0 || (length & 0x3) != 0) {
+ dev_err(&client->dev,
+ "addr & len must be 4 bytes aligned %x, %x\n",
+ address, length);
+ return -EINVAL;
+ }
+
+ while (length) {
+ packet_size = min(length, PACKET_SIZE);
+
+ pkt_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE;
+ pkt_buf[CMD_TYPE_OFFSET] = VND_SET_DATA;
+ put_unaligned_le16(packet_size, &pkt_buf[CMD_INDEX_OFFSET]);
+ put_unaligned_le32(address, &pkt_buf[CMD_LENGTH_OFFSET]);
+ memcpy(&pkt_buf[CMD_DATA_OFFSET], data, packet_size);
+
+ error = wdt87xx_set_feature(client, pkt_buf, sizeof(pkt_buf));
+ if (error)
+ return error;
+
+ length -= packet_size;
+ data += packet_size;
+ address += packet_size;
+
+ /* Wait for the controller to finish the write */
+ mdelay(WDT_FLASH_WRITE_DELAY_MS);
+
+ if ((++count % 32) == 0) {
+ /* Delay for fw to clear watch dog */
+ msleep(20);
+ }
+ }
+
+ return 0;
+}
+
+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 u16 wdt87xx_calculate_checksum(const u8 *data, size_t length)
+{
+ u16 checksum = 0;
+ size_t i;
+
+ for (i = 0; i < length; i++)
+ checksum = misr(checksum, data[i]);
+
+ return checksum;
+}
+
+static int wdt87xx_get_checksum(struct i2c_client *client, u16 *checksum,
+ u32 address, int length)
+{
+ int error;
+ int time_delay;
+ u8 pkt_buf[PKT_BUF_SIZE];
+ u8 cmd_buf[CMD_BUF_SIZE];
+
+ error = wdt87xx_send_command(client, VND_SET_CHECKSUM_LENGTH, length);
+ if (error) {
+ dev_err(&client->dev, "failed to set checksum length\n");
+ return error;
+ }
+
+ error = wdt87xx_send_command(client, VND_SET_CHECKSUM_CALC, address);
+ if (error) {
+ dev_err(&client->dev, "failed to set checksum address\n");
+ return error;
+ }
+
+ /* Wait the operation to complete */
+ time_delay = DIV_ROUND_UP(length, 1024);
+ msleep(time_delay * 30);
+
+ memset(cmd_buf, 0, sizeof(cmd_buf));
+ cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_READ;
+ cmd_buf[CMD_TYPE_OFFSET] = VND_GET_CHECKSUM;
+ error = wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf));
+ if (error) {
+ dev_err(&client->dev, "failed to request checksum\n");
+ return error;
+ }
+
+ memset(pkt_buf, 0, sizeof(pkt_buf));
+ pkt_buf[CMD_REPORT_ID_OFFSET] = VND_READ_DATA;
+ error = wdt87xx_get_feature(client, pkt_buf, sizeof(pkt_buf));
+ if (error) {
+ dev_err(&client->dev, "failed to read checksum\n");
+ return error;
+ }
+
+ *checksum = get_unaligned_le16(&pkt_buf[CMD_DATA_OFFSET]);
+ return 0;
+}
+
+static int wdt87xx_write_firmware(struct i2c_client *client, const void *chunk)
+{
+ u32 start_addr = get_unaligned_le32(chunk + FW_CHUNK_TGT_START_OFFSET);
+ u32 size = get_unaligned_le32(chunk + FW_CHUNK_PAYLOAD_LEN_OFFSET);
+ const void *data = chunk + FW_CHUNK_PAYLOAD_OFFSET;
+ int error;
+ int err1;
+ int page_size;
+ int retry = 0;
+ u16 device_checksum, firmware_checksum;
+
+ dev_dbg(&client->dev, "start 4k page program\n");
+
+ error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_STOP);
+ if (error) {
+ dev_err(&client->dev, "stop report mode failed\n");
+ return error;
+ }
+
+ error = wdt87xx_send_command(client, VND_CMD_SFUNL, 0);
+ if (error) {
+ dev_err(&client->dev, "unlock failed\n");
+ goto out_enable_reporting;
+ }
+
+ mdelay(10);
+
+ while (size) {
+ dev_dbg(&client->dev, "%s: %x, %x\n", __func__,
+ start_addr, size);
+
+ page_size = min_t(u32, size, PG_SIZE);
+ size -= page_size;
+
+ for (retry = 0; retry < MAX_RETRIES; retry++) {
+ error = wdt87xx_send_command(client, VND_CMD_ERASE,
+ start_addr);
+ if (error) {
+ dev_err(&client->dev,
+ "erase failed at %#08x\n", start_addr);
+ break;
+ }
+
+ msleep(50);
+
+ error = wdt87xx_write_data(client, data, start_addr,
+ page_size);
+ if (error) {
+ dev_err(&client->dev,
+ "write failed at %#08x (%d bytes)\n",
+ start_addr, page_size);
+ break;
+ }
+
+ error = wdt87xx_get_checksum(client, &device_checksum,
+ start_addr, page_size);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to retrieve checksum for %#08x (len: %d)\n",
+ start_addr, page_size);
+ break;
+ }
+
+ firmware_checksum =
+ wdt87xx_calculate_checksum(data, page_size);
+
+ if (device_checksum == firmware_checksum)
+ break;
+
+ dev_err(&client->dev,
+ "checksum fail: %d vs %d, retry %d\n",
+ device_checksum, firmware_checksum, retry);
+ }
+
+ if (retry == MAX_RETRIES) {
+ dev_err(&client->dev, "page write failed\n");
+ error = -EIO;
+ goto out_lock_device;
+ }
+
+ start_addr = start_addr + page_size;
+ data = data + page_size;
+ }
+
+out_lock_device:
+ err1 = wdt87xx_send_command(client, VND_CMD_SFLCK, 0);
+ if (err1)
+ dev_err(&client->dev, "lock failed\n");
+
+ mdelay(10);
+
+out_enable_reporting:
+ err1 = wdt87xx_send_command(client, VND_CMD_START, 0);
+ if (err1)
+ dev_err(&client->dev, "start to report failed\n");
+
+ return error ? error : err1;
+}
+
+static int wdt87xx_load_chunk(struct i2c_client *client,
+ const struct firmware *fw, u32 ck_id)
+{
+ const void *chunk;
+ int error;
+
+ chunk = wdt87xx_get_fw_chunk(fw, ck_id);
+ if (!chunk) {
+ dev_err(&client->dev, "unable to locate chunk (type %d)\n",
+ ck_id);
+ return -EINVAL;
+ }
+
+ error = wdt87xx_validate_fw_chunk(chunk, ck_id);
+ if (error) {
+ dev_err(&client->dev, "invalid chunk (type %d): %d\n",
+ ck_id, error);
+ return error;
+ }
+
+ error = wdt87xx_write_firmware(client, chunk);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to write fw chunk (type %d): %d\n",
+ ck_id, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_do_update_firmware(struct i2c_client *client,
+ const struct firmware *fw,
+ unsigned int chunk_id)
+{
+ struct wdt87xx_data *wdt = i2c_get_clientdata(client);
+ int error;
+
+ error = wdt87xx_validate_firmware(wdt, fw);
+ if (error)
+ return error;
+
+ error = mutex_lock_interruptible(&wdt->fw_mutex);
+ if (error)
+ return error;
+
+ disable_irq(client->irq);
+
+ error = wdt87xx_load_chunk(client, fw, chunk_id);
+ if (error) {
+ dev_err(&client->dev,
+ "firmware load failed (type: %d): %d\n",
+ chunk_id, error);
+ goto out;
+ }
+
+ error = wdt87xx_sw_reset(client);
+ if (error) {
+ dev_err(&client->dev, "soft reset failed: %d\n", error);
+ goto out;
+ }
+
+ /* Refresh the parameters */
+ error = wdt87xx_get_sysparam(client, &wdt->param);
+ if (error)
+ dev_err(&client->dev,
+ "failed to refresh system paramaters: %d\n", error);
+out:
+ enable_irq(client->irq);
+ mutex_unlock(&wdt->fw_mutex);
+
+ return error ? error : 0;
+}
+
+static int wdt87xx_update_firmware(struct device *dev,
+ const char *fw_name, unsigned int chunk_id)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ const struct firmware *fw;
+ int error;
+
+ error = request_firmware(&fw, fw_name, dev);
+ if (error) {
+ dev_err(&client->dev, "unable to retrieve firmware %s: %d\n",
+ fw_name, error);
+ return error;
+ }
+
+ error = wdt87xx_do_update_firmware(client, fw, chunk_id);
+
+ release_firmware(fw);
+
+ return error ? error : 0;
+}
+
+static ssize_t config_csum_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_data *wdt = i2c_get_clientdata(client);
+ u32 cfg_csum;
+
+ cfg_csum = wdt->param.xmls_id1;
+ cfg_csum = (cfg_csum << 16) | wdt->param.xmls_id2;
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", cfg_csum);
+}
+
+static ssize_t fw_version_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_data *wdt = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.fw_id);
+}
+
+static ssize_t plat_id_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct wdt87xx_data *wdt = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.plat_id);
+}
+
+static ssize_t update_config_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int error;
+
+ error = wdt87xx_update_firmware(dev, WDT87XX_CFG_NAME, CHUNK_ID_CNFG);
+
+ return error ? error : count;
+}
+
+static ssize_t update_fw_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int error;
+
+ error = wdt87xx_update_firmware(dev, WDT87XX_FW_NAME, CHUNK_ID_FRWR);
+
+ return error ? error : count;
+}
+
+static DEVICE_ATTR_RO(config_csum);
+static DEVICE_ATTR_RO(fw_version);
+static DEVICE_ATTR_RO(plat_id);
+static DEVICE_ATTR_WO(update_config);
+static DEVICE_ATTR_WO(update_fw);
+
+static struct attribute *wdt87xx_attrs[] = {
+ &dev_attr_config_csum.attr,
+ &dev_attr_fw_version.attr,
+ &dev_attr_plat_id.attr,
+ &dev_attr_update_config.attr,
+ &dev_attr_update_fw.attr,
+ NULL
+};
+
+static const struct attribute_group wdt87xx_attr_group = {
+ .attrs = wdt87xx_attrs,
+};
+
+static void wdt87xx_report_contact(struct input_dev *input,
+ struct wdt87xx_sys_param *param,
+ u8 *buf)
+{
+ int finger_id;
+ u32 x, y;
+ u8 w, p;
+
+ finger_id = (buf[FINGER_EV_V1_OFFSET_ID] >> 3) - 1;
+ if (finger_id < 0)
+ return;
+
+ /* Check if this is an active contact */
+ if (!(buf[FINGER_EV_V1_OFFSET_ID] & 0x1))
+ return;
+
+ w = buf[FINGER_EV_V1_OFFSET_W];
+ p = buf[FINGER_EV_V1_OFFSET_P];
+
+ x = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_X);
+
+ y = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_Y);
+ y = DIV_ROUND_CLOSEST(y * param->phy_h, param->phy_w);
+
+ /* Refuse incorrect coordinates */
+ if (x > param->max_x || y > param->max_y)
+ return;
+
+ dev_dbg(input->dev.parent, "tip on (%d), x(%d), y(%d)\n",
+ finger_id, x, y);
+
+ input_mt_slot(input, finger_id);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, 1);
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, w);
+ input_report_abs(input, ABS_MT_PRESSURE, p);
+ input_report_abs(input, ABS_MT_POSITION_X, x);
+ input_report_abs(input, ABS_MT_POSITION_Y, y);
+}
+
+static irqreturn_t wdt87xx_ts_interrupt(int irq, void *dev_id)
+{
+ struct wdt87xx_data *wdt = dev_id;
+ struct i2c_client *client = wdt->client;
+ int i, fingers;
+ int error;
+ u8 raw_buf[WDT_V1_RAW_BUF_COUNT] = {0};
+
+ error = i2c_master_recv(client, raw_buf, WDT_V1_RAW_BUF_COUNT);
+ if (error < 0) {
+ dev_err(&client->dev, "read v1 raw data failed: %d\n", error);
+ goto irq_exit;
+ }
+
+ fingers = raw_buf[TOUCH_PK_V1_OFFSET_FNGR_NUM];
+ if (!fingers)
+ goto irq_exit;
+
+ for (i = 0; i < WDT_MAX_FINGER; i++)
+ wdt87xx_report_contact(wdt->input,
+ &wdt->param,
+ &raw_buf[TOUCH_PK_V1_OFFSET_EVENT +
+ i * FINGER_EV_V1_SIZE]);
+
+ input_mt_sync_frame(wdt->input);
+ input_sync(wdt->input);
+
+irq_exit:
+ return IRQ_HANDLED;
+}
+
+static int wdt87xx_ts_create_input_device(struct wdt87xx_data *wdt)
+{
+ struct device *dev = &wdt->client->dev;
+ struct input_dev *input;
+ unsigned int res = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS, wdt->param.phy_w);
+ int error;
+
+ input = devm_input_allocate_device(dev);
+ if (!input) {
+ dev_err(dev, "failed to allocate input device\n");
+ return -ENOMEM;
+ }
+ wdt->input = input;
+
+ input->name = "WDT87xx Touchscreen";
+ input->id.bustype = BUS_I2C;
+ input->phys = wdt->phys;
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
+ wdt->param.max_x, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
+ wdt->param.max_y, 0, 0);
+ input_abs_set_res(input, ABS_MT_POSITION_X, res);
+ input_abs_set_res(input, ABS_MT_POSITION_Y, res);
+
+ input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, 0xFF, 0, 0);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xFF, 0, 0);
+
+ input_mt_init_slots(input, WDT_MAX_FINGER,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(dev, "failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wdt87xx_data *wdt;
+ int error;
+
+ dev_dbg(&client->dev, "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 -ENXIO;
+
+ wdt = devm_kzalloc(&client->dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
+
+ wdt->client = client;
+ mutex_init(&wdt->fw_mutex);
+ i2c_set_clientdata(client, wdt);
+
+ snprintf(wdt->phys, sizeof(wdt->phys), "i2c-%u-%04x/input0",
+ client->adapter->nr, client->addr);
+
+ error = wdt87xx_get_sysparam(client, &wdt->param);
+ if (error)
+ return error;
+
+ error = wdt87xx_ts_create_input_device(wdt);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, wdt87xx_ts_interrupt,
+ IRQF_ONESHOT,
+ client->name, wdt);
+ if (error) {
+ dev_err(&client->dev, "request irq failed: %d\n", error);
+ return error;
+ }
+
+ error = sysfs_create_group(&client->dev.kobj, &wdt87xx_attr_group);
+ if (error) {
+ dev_err(&client->dev, "create sysfs failed: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int wdt87xx_ts_remove(struct i2c_client *client)
+{
+ 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 error;
+
+ disable_irq(client->irq);
+
+ error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_IDLE);
+ if (error) {
+ enable_irq(client->irq);
+ dev_err(&client->dev,
+ "failed to stop device when suspending: %d\n",
+ error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused wdt87xx_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int error;
+
+ /*
+ * The chip may have been reset while system is resuming,
+ * give it some time to settle.
+ */
+ mdelay(100);
+
+ error = wdt87xx_send_command(client, VND_CMD_START, 0);
+ if (error)
+ dev_err(&client->dev,
+ "failed to start device when resuming: %d\n",
+ error);
+
+ enable_irq(client->irq);
+
+ 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,
+ .pm = &wdt87xx_pm_ops,
+ .acpi_match_table = ACPI_PTR(wdt87xx_acpi_id),
+ },
+};
+module_i2c_driver(wdt87xx_driver);
+
+MODULE_AUTHOR("HN Chen <hn.chen@weidahitech.com>");
+MODULE_DESCRIPTION("WeidaHiTech WDT87XX Touchscreen driver");
+MODULE_VERSION(WDT87XX_DRV_VER);
+MODULE_LICENSE("GPL");