/* * Weida HiTech WDT87xx TouchScreen I2C driver * * Copyright (c) 2015 Weida Hi-Tech Co., Ltd. * HN Chen * * 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 #include #include #include #include #include #include #include #include #include #include #include #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, xml_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 %zu\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 "); MODULE_DESCRIPTION("WeidaHiTech WDT87XX Touchscreen driver"); MODULE_VERSION(WDT87XX_DRV_VER); MODULE_LICENSE("GPL");