[PATCH 6/6] input: cyapa: add sysfs interfaces supported for gen5 trackpad device

[Dudley Du]

Add sysfs interfaces for gen5 trackpad devices that required in production,
including read and update firmware image, report baselines, sensors calibrate,
read product id, read firmware version.
TEST=test on Chomebooks.

Signed-off-by: Du, Dudley <dudl@xxxxxxxxxxx>
---
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index effa9c5..8653ffd 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig
@@ -205,7 +205,7 @@ config MOUSE_BCM5974

 config MOUSE_CYAPA
        tristate "Cypress APA I2C Trackpad support"
-       depends on I2C
+       depends on I2C && CRC_ITU_T
        help
          This driver adds support for Cypress All Points Addressable (APA)
          I2C Trackpads, including the ones used in 2012 Samsung Chromebooks.
diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index 66cb5cc..63a2c79 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -29,6 +29,8 @@
 #include <linux/uaccess.h>
 #include <linux/unaligned/access_ok.h>
 #include <linux/pm_runtime.h>
+#include <linux/crc-ccitt.h>
+#include <linux/crc-itu-t.h>


 /* APA trackpad firmware generation */
@@ -2364,6 +2366,86 @@ static int cyapa_gen5_state_parse(struct cyapa *cyapa, u8 *reg_data, int len)
        return -EAGAIN;
 }

+static int cyapa_gen5_bl_initiate(struct cyapa *cyapa,
+               const struct firmware *fw)
+{
+       int ret = 0;
+       u16 length = 0;
+       u16 data_len = 0;
+       u16 meta_data_crc = 0;
+       u16 cmd_crc = 0;
+       u8 bl_gen5_activate[18 + CYAPA_TSG_FLASH_MAP_BLOCK_SIZE + 3];
+       int bl_gen5_activate_size = 0;
+       u8 resp_data[11];
+       int resp_len;
+       struct cyapa_tsg_bin_image *image;
+       int records_num;
+       u8 *data;
+
+       /* Try to dump all bufferred report data before send any command. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       bl_gen5_activate_size = sizeof(bl_gen5_activate);
+       memset(bl_gen5_activate, 0, bl_gen5_activate_size);
+
+       /* Output Report Register Address[15:0] = 0004h */
+       bl_gen5_activate[0] = 0x04;
+       bl_gen5_activate[1] = 0x00;
+
+       /* totoal command length[15:0] */
+       length = bl_gen5_activate_size - 2;
+       put_unaligned_le16(length, &bl_gen5_activate[2]);
+       bl_gen5_activate[4] = 0x40;  /* Report ID = 40h */
+       bl_gen5_activate[5] = 0x00;  /* RSVD = 00h */
+
+       bl_gen5_activate[6] = GEN5_SOP_KEY;  /* SOP = 01h */
+       bl_gen5_activate[7] = 0x48;  /* Command Code = 48h */
+
+       /* 8 Key bytes and block size */
+       data_len = CYAPA_TSG_BL_KEY_SIZE + CYAPA_TSG_FLASH_MAP_BLOCK_SIZE;
+       /* Data Length[15:0] */
+       put_unaligned_le16(data_len, &bl_gen5_activate[8]);
+       bl_gen5_activate[10] = 0xa5;  /* Key Byte 0 */
+       bl_gen5_activate[11] = 0x01;
+       bl_gen5_activate[12] = 0x02;  /*     .      */
+       bl_gen5_activate[13] = 0x03;  /*     .      */
+       bl_gen5_activate[14] = 0xff;  /*     .      */
+       bl_gen5_activate[15] = 0xfe;
+       bl_gen5_activate[16] = 0xfd;
+       bl_gen5_activate[17] = 0x5a;  /* Key Byte 7 */
+
+       /* copy 60 bytes Meta Data Row Parameters */
+       image = (struct cyapa_tsg_bin_image *)fw->data;
+       records_num = (fw->size - sizeof(struct cyapa_tsg_bin_image_head)) /
+                               sizeof(struct cyapa_tsg_bin_image_data_record);
+       /* APP_INTEGRITY row is always the last row block */
+       data = image->records[records_num - 1].record_data;
+       memcpy(&bl_gen5_activate[18], data, CYAPA_TSG_FLASH_MAP_METADATA_SIZE);
+
+       meta_data_crc = crc_itu_t(0xffff, &bl_gen5_activate[18],
+                               CYAPA_TSG_FLASH_MAP_METADATA_SIZE);
+       /* Meta Data CRC[15:0] */
+       put_unaligned_le16(meta_data_crc,
+               &bl_gen5_activate[18 + CYAPA_TSG_FLASH_MAP_METADATA_SIZE]);
+
+       cmd_crc = crc_itu_t(0xffff, &bl_gen5_activate[6], 4 + data_len);
+       put_unaligned_le16(cmd_crc,
+               &bl_gen5_activate[bl_gen5_activate_size - 3]);  /* CRC[15:0] */
+       bl_gen5_activate[bl_gen5_activate_size - 1] = GEN5_EOP_KEY;
+
+       resp_len = sizeof(resp_data);
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       bl_gen5_activate, sizeof(bl_gen5_activate),
+                       resp_data, &resp_len, 12000,
+                       cyapa_gen5_sort_tsg_pip_bl_resp_data);
+       if (ret || resp_len != GEN5_BL_INITIATE_RESP_LEN ||
+                       resp_data[2] != GEN5_BL_RESP_REPORT_ID ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+               return (ret < 0) ? ret : -EAGAIN;
+
+       return 0;
+}
+
 bool cyapa_gen5_sort_bl_exit_data(struct cyapa *cyapa, u8 *buf, int len)
 {
        if (buf == NULL || len < GEN5_RESP_LENGTH_SIZE)
@@ -2410,6 +2492,373 @@ static int cyapa_gen5_bl_exit(struct cyapa *cyapa)
        return -EAGAIN;
 }

+static int cyapa_gen5_bl_enter(struct cyapa *cyapa)
+{
+       int ret;
+       u8 cmd[] = { 0x04, 0x00, 0x05, 0x00, 0x2F, 0x00, 0x01 };
+       u8 resp_data[2];
+       int resp_len;
+
+       if (cyapa->input) {
+               cyapa_disable_irq(cyapa);
+               input_unregister_device(cyapa->input);
+               cyapa->input = NULL;
+       }
+       cyapa_enable_irq(cyapa);
+
+       ret = cyapa_poll_state(cyapa, 500);
+       if (ret < 0)
+               return ret;
+       if (cyapa->gen != CYAPA_GEN5)
+               return -EINVAL;
+
+       /* Already in Gen5 BL. Skipping exit. */
+       if (cyapa->state == CYAPA_STATE_GEN5_BL)
+               return 0;
+
+       if (cyapa->state != CYAPA_STATE_GEN5_APP)
+               return -EAGAIN;
+
+       /* Try to dump all bufferred report data before send any command. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       /*
+        * send bootloader enter command to trackpad device,
+        * after enter bootloader, the response data is two bytes of 0x00 0x00.
+        */
+       resp_len = sizeof(resp_data);
+       memset(resp_data, 0, resp_len);
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, sizeof(cmd),
+                       resp_data, &resp_len,
+                       5000, cyapa_gen5_sort_application_launch_data);
+       if (ret || resp_data[0] != 0x00 || resp_data[1] != 0x00)
+               return (ret < 0) ? ret : -EAGAIN;
+
+       cyapa->state = CYAPA_STATE_GEN5_BL;
+       return 0;
+}
+
+static int cyapa_gen5_check_fw(struct cyapa *cyapa, const struct firmware *fw)
+{
+       int i;
+       struct cyapa_tsg_bin_image *image;
+       int flash_records_count;
+       u16 expected_app_crc;
+       u16 expected_app_integrity_crc;
+       u16 app_crc = 0;
+       u16 app_integrity_crc = 0;
+       u16 row_num;
+       u8 *data;
+       u32 app_start;
+       u16 app_len;
+       u32 img_start;
+       u16 img_len;
+       int record_index;
+       struct device *dev = &cyapa->client->dev;
+
+       image = (struct cyapa_tsg_bin_image *)fw->data;
+       flash_records_count = (fw->size -
+                       sizeof(struct cyapa_tsg_bin_image_head)) /
+                       sizeof(struct cyapa_tsg_bin_image_data_record);
+
+       /* APP_INTEGRITY row is always the last row block,
+        * and the row id must be 0x01ff */
+       row_num = get_unaligned_be16(
+                       &image->records[flash_records_count - 1].row_number);
+       if (&image->records[flash_records_count - 1].flash_array_id != 0x00 &&
+                       row_num != 0x01ff) {
+               dev_err(dev, "%s: invaid app_integrity data.\n", __func__);
+               return -EINVAL;
+       }
+       data = image->records[flash_records_count - 1].record_data;
+       app_start = get_unaligned_le32(&data[4]);
+       app_len = get_unaligned_le16(&data[8]);
+       expected_app_crc = get_unaligned_le16(&data[10]);
+       img_start = get_unaligned_le32(&data[16]);
+       img_len = get_unaligned_le16(&data[20]);
+       expected_app_integrity_crc = get_unaligned_le16(&data[60]);
+
+       if ((app_start + app_len + img_start + img_len) %
+                       CYAPA_TSG_FW_ROW_SIZE) {
+               dev_err(dev, "%s: invaid image alignment.\n", __func__);
+               return -EINVAL;
+       }
+
+       /* verify app_integrity crc */
+       app_integrity_crc = crc_itu_t(0xffff, data,
+                       CYAPA_TSG_APP_INTEGRITY_SIZE);
+       if (app_integrity_crc != expected_app_integrity_crc) {
+               dev_err(dev, "%s: invaid app_integrity crc.\n", __func__);
+               return -EINVAL;
+       }
+
+       /*
+        * verify application image CRC
+        */
+       record_index = app_start / CYAPA_TSG_FW_ROW_SIZE -
+                               CYAPA_TSG_IMG_START_ROW_NUM;
+       data = (u8 *)&image->records[record_index].record_data;
+       app_crc = crc_itu_t(0xffff, data, CYAPA_TSG_FW_ROW_SIZE);
+       for (i = 1; i < (app_len / CYAPA_TSG_FW_ROW_SIZE); i++) {
+               data = (u8 *)&image->records[++record_index].record_data;
+               app_crc = crc_itu_t(app_crc, data, CYAPA_TSG_FW_ROW_SIZE);
+       }
+
+       if (app_crc != expected_app_crc) {
+               dev_err(dev, "%s: invaid firmware app crc check.\n", __func__);
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static int cyapa_gen5_write_fw_block(struct cyapa *cyapa,
+               struct cyapa_tsg_bin_image_data_record *flash_record)
+{
+       u8 flash_array_id;
+       u16 flash_row_id;
+       u16 record_len;
+       u8 *record_data;
+       u8 cmd[144];  /* 13 + 128+ 3 */
+       u16 cmd_len;
+       u16 data_len;
+       u16 crc;
+       u8 resp_data[11];
+       int resp_len;
+       int ret;
+
+       flash_array_id = flash_record->flash_array_id;
+       flash_row_id = get_unaligned_be16(&flash_record->row_number);
+       record_len = get_unaligned_be16(&flash_record->record_len);
+       record_data = flash_record->record_data;
+
+       cmd_len = sizeof(cmd) - 2; /* not include 2 bytes regisetr address. */
+       memset(cmd, 0, cmd_len + 2);
+       cmd[0] = 0x04;  /* register address */
+       cmd[1] = 0x00;
+
+       put_unaligned_le16(cmd_len, &cmd[2]);
+       cmd[4] = 0x40;  /* report id 40h */
+       cmd[5] = 0x00;
+
+       cmd[6] = GEN5_SOP_KEY;  /* SOP = 01h */
+       cmd[7] = 0x39;  /* command code = 39h */
+       /* 1 (Flash Array ID) + 2 (Flash Row ID) + 128 (flash data) */
+       data_len = 3 + record_len;
+       put_unaligned_le16(data_len, &cmd[8]);
+       cmd[10] = flash_array_id;  /* Flash Array ID = 00h */
+       put_unaligned_le16(flash_row_id, &cmd[11]);
+
+       memcpy(&cmd[13], record_data, record_len);
+       crc = crc_itu_t(0xffff, &cmd[6], 4 + data_len);
+       put_unaligned_le16(crc, &cmd[2 + cmd_len - 3]);
+       cmd[2 + cmd_len - 1] = GEN5_EOP_KEY;
+
+       resp_len = sizeof(resp_data);
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, sizeof(cmd),
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_bl_resp_data);
+       if (ret || resp_len != GEN5_BL_BLOCK_WRITE_RESP_LEN ||
+                       resp_data[2] != GEN5_BL_RESP_REPORT_ID ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+               return ret < 0 ? ret : -EAGAIN;
+
+       return 0;
+}
+
+static int cyapa_gen5_read_fw_bytes(struct cyapa *cyapa, u16 row_num, u8 *data)
+{
+       int ret;
+       u8 cmd[16];
+       size_t cmd_len;
+       u8 resp_data[CYAPA_TSG_FW_ROW_SIZE / 2 + GEN5_MIN_BL_RESP_LENGTH];
+       int resp_len;
+       u16 offset;
+       u16 cmd_crc;
+       struct cyapa_tsg_bin_image_data_record *fw_img_record;
+
+       fw_img_record = (struct cyapa_tsg_bin_image_data_record *)data;
+
+       cmd[0] = 0x04;  /* register address */
+       cmd[1] = 0x00;
+       cmd[2] = 0x0e;
+       cmd[3] = 0x00;
+       cmd[4] = 0x40;  /* report id 40h */
+       cmd[5] = 0x00;
+       cmd[6] = GEN5_SOP_KEY;
+       cmd[7] = 0x3d;  /* read application image command code */
+       cmd[8] = 0x03;
+       cmd[9] = 0x00;
+       offset = row_num * CYAPA_TSG_FW_ROW_SIZE -
+                       CYAPA_TSG_START_OF_APPLICATION;
+       put_unaligned_le16(offset, &cmd[10]);
+       cmd[12] = CYAPA_TSG_IMG_READ_SIZE;
+       cmd_crc = crc_itu_t(0xffff, &cmd[6], 7);
+       put_unaligned_le16(cmd_crc, &cmd[13]);  /* CRC[15:0] */
+       cmd[15] = GEN5_EOP_KEY;  /* EOP = 17h */
+       cmd_len = 16;
+
+       resp_len = CYAPA_TSG_IMG_READ_SIZE + GEN5_MIN_BL_RESP_LENGTH;
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, cmd_len,
+                       resp_data, &resp_len,
+                       50, cyapa_gen5_sort_tsg_pip_bl_resp_data);
+       if (resp_len != (CYAPA_TSG_IMG_READ_SIZE + GEN5_MIN_BL_RESP_LENGTH) ||
+                       ret || resp_data[2] != GEN5_BL_RESP_REPORT_ID ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+               return (ret < 0) ? ret : -EAGAIN;
+
+       /* copy first 64 bytes in the row. */
+       memcpy(&fw_img_record->record_data[0], &resp_data[8],
+                       CYAPA_TSG_IMG_READ_SIZE);
+
+       if (row_num == CYAPA_TSG_IMG_APP_INTEGRITY_ROW_NUM) {
+               /* last row's rest 64 bytes are bootloader metadata,
+                * it's not allowed to be read out, will respond with error. */
+               memset(&fw_img_record->record_data[CYAPA_TSG_IMG_READ_SIZE],
+                       0, CYAPA_TSG_IMG_READ_SIZE);
+               goto skip_last_row;
+       }
+
+       /* read next 64 bytes in the row. */
+       offset = offset + CYAPA_TSG_IMG_READ_SIZE;
+       put_unaligned_le16(offset, &cmd[10]);
+       cmd_crc = crc_itu_t(0xffff, &cmd[6], 7);
+       put_unaligned_le16(cmd_crc, &cmd[13]);  /* CRC[15:0] */
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, cmd_len,
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_bl_resp_data);
+       if (resp_len != (CYAPA_TSG_IMG_READ_SIZE + GEN5_MIN_BL_RESP_LENGTH) ||
+                       ret || resp_data[2] != GEN5_BL_RESP_REPORT_ID ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+               return (ret < 0) ? ret : -EAGAIN;
+
+       /* copy last 64 bytes in the row. */
+       memcpy(&fw_img_record->record_data[CYAPA_TSG_IMG_READ_SIZE],
+               &resp_data[8], CYAPA_TSG_IMG_READ_SIZE);
+
+skip_last_row:
+       fw_img_record->flash_array_id = 0;
+       put_unaligned_be16(row_num, &fw_img_record->row_number);
+       put_unaligned_be16(CYAPA_TSG_FW_ROW_SIZE, &fw_img_record->record_len);
+
+       return 0;
+}
+
+static int cyapa_gen5_read_fw(struct cyapa *cyapa)
+{
+       int ret;
+       int fw_img_head_size;
+       int fw_img_record_size;
+       int row_index;
+       int array_index;
+       u32 img_start;
+       u16 img_len;
+       u16 img_start_row;
+       u16 img_end_row;
+       struct cyapa_tsg_bin_image_data_record app_integrity;
+       u8 *record_data;
+
+       if (cyapa->read_fw_image)
+               return 0;
+
+       ret = cyapa_gen5_bl_enter(cyapa);
+       if (ret)
+               goto err;
+
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       fw_img_head_size = sizeof(struct cyapa_tsg_bin_image_head);
+       fw_img_record_size = sizeof(struct cyapa_tsg_bin_image_data_record);
+
+       /* Read app integrity block data. */
+       row_index = CYAPA_TSG_IMG_APP_INTEGRITY_ROW_NUM;
+       ret = cyapa_gen5_read_fw_bytes(cyapa, row_index, (u8 *)&app_integrity);
+       if (ret)
+               goto err;
+       img_start = get_unaligned_le32(&app_integrity.record_data[16]);
+       img_len = get_unaligned_le16(&app_integrity.record_data[20]);
+       if ((img_start + img_len) % CYAPA_TSG_FW_ROW_SIZE)
+               goto err;
+       img_start_row = img_start / CYAPA_TSG_FW_ROW_SIZE;
+       img_end_row = (img_start + img_len) / CYAPA_TSG_FW_ROW_SIZE - 1;
+
+       /* allocate memory for image. */
+       cyapa->read_fw_image_size = fw_img_head_size +
+               (img_end_row -  img_start_row + 2) * fw_img_record_size;
+       cyapa->read_fw_image = kmalloc(cyapa->read_fw_image_size, GFP_KERNEL);
+       if (!cyapa->read_fw_image) {
+               ret = -ENOMEM;
+               goto err;
+       }
+
+       /* set image head data. */
+       memcpy(cyapa->read_fw_image, &cyapa->fw_img_head, fw_img_head_size);
+
+       /* read image blocks. */
+       for (row_index = img_start_row, array_index = 0;
+                       row_index <= img_end_row;
+                       row_index++, array_index++) {
+               record_data = &cyapa->read_fw_image[fw_img_head_size +
+                               array_index * fw_img_record_size];
+               ret = cyapa_gen5_read_fw_bytes(cyapa, row_index, record_data);
+               if (ret)
+                       goto err;
+       }
+
+       /* append last app integrity block data. */
+       record_data = &cyapa->read_fw_image[fw_img_head_size +
+                               array_index * fw_img_record_size];
+       memcpy(record_data, &app_integrity, fw_img_record_size);
+
+err:
+       if (ret) {
+               kfree(cyapa->read_fw_image);
+               cyapa->read_fw_image = NULL;
+               cyapa->read_fw_image_size = 0;
+       }
+
+       cyapa_detect_async(cyapa, 0);
+       return ret;
+}
+
+static int cyapa_gen5_do_fw_update(struct cyapa *cyapa,
+               const struct firmware *fw)
+{
+       struct device *dev = &cyapa->client->dev;
+       struct cyapa_tsg_bin_image *image =
+               (struct cyapa_tsg_bin_image *)fw->data;
+       struct cyapa_tsg_bin_image_data_record *flash_record;
+       int flash_records_count;
+       int i;
+       int ret;
+
+       /* Try to dump all bufferred data if exists before send commands. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       flash_records_count =
+               (fw->size - sizeof(struct cyapa_tsg_bin_image_head)) /
+                       sizeof(struct cyapa_tsg_bin_image_data_record);
+       /*
+        * the last flash row 0x01ff has been written through bl_initiate
+        *  command, so DO NOT write flash 0x01ff to trackpad device.
+        */
+       for (i = 0; i < (flash_records_count - 1); i++) {
+               flash_record = &image->records[i];
+               ret = cyapa_gen5_write_fw_block(cyapa, flash_record);
+               if (ret) {
+                       dev_err(dev, "%s: Gen5 FW update aborted, %d\n",
+                               __func__, ret);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
 static int cyapa_gen5_sleep_time_check(u16 sleep_time)
 {
        if (sleep_time > 1000)
@@ -2694,6 +3143,763 @@ static int cyapa_gen5_set_power_mode(struct cyapa *cyapa,
        return ret;
 }

+static int cyapa_gen5_resume_scanning(struct cyapa *cyapa)
+{
+       u8 cmd[7] = { 0x04, 0x00, 0x05, 0x00, 0x2f, 0x00, 0x04 };
+       u8 resp_data[6];
+       int resp_len;
+       int ret;
+
+       /* Try to dump all bufferred data before doing command. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       resp_len = 6;
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, 7,
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_app_resp_data);
+       if (ret || resp_data[2] != GEN5_APP_RESP_REPORT_ID ||
+                       resp_data[3] != GEN5_RESP_RSVD_KEY ||
+                       GET_GEN5_CMD_CODE(resp_data[4]) != 0x04)
+               return -EINVAL;
+
+       /* Try to dump all bufferred data when resuming scanning. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       return 0;
+}
+
+static int cyapa_gen5_suspend_scanning(struct cyapa *cyapa)
+{
+       u8 cmd[7] = { 0x04, 0x00, 0x05, 0x00, 0x2f, 0x00, 0x03 };
+       u8 resp_data[6];
+       int resp_len;
+       int ret;
+
+       /* Try to dump all bufferred data before doing command. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       resp_len = 6;
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, 7,
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_app_resp_data);
+       if (ret || resp_data[2] != GEN5_APP_RESP_REPORT_ID ||
+                       resp_data[3] != GEN5_RESP_RSVD_KEY ||
+                       GET_GEN5_CMD_CODE(resp_data[4]) != 0x03)
+               return -EINVAL;
+
+       /* Try to dump all bufferred data when suspending scanning. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       return 0;
+}
+
+static int cyapa_gen5_calibrate_pwcs(struct cyapa *cyapa,
+               u8 calibrate_sensing_mode_type)
+{
+       int ret;
+       u8 cmd[8];
+       u8 resp_data[6];
+       int resp_len;
+
+       /* Try to dump all bufferred data before doing command. */
+       cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+       cmd[0] = 0x04;
+       cmd[1] = 0x00;
+       cmd[2] = 0x06;
+       cmd[3] = 0x00;
+       cmd[4] = GEN5_APP_CMD_REPORT_ID;
+       cmd[5] = 0x00;
+       cmd[6] = GEN5_CMD_CALIBRATE;
+       cmd[7] = calibrate_sensing_mode_type;
+       resp_len = sizeof(resp_data);
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, sizeof(cmd),
+                       resp_data, &resp_len,
+                       5000, cyapa_gen5_sort_tsg_pip_app_resp_data);
+       if (ret || resp_data[2] != GEN5_APP_RESP_REPORT_ID ||
+                       GET_GEN5_CMD_CODE(resp_data[4]) != GEN5_CMD_CALIBRATE ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+               return ret < 0 ? ret : -EAGAIN;
+
+       return 0;
+}
+
+static ssize_t cyapa_gen5_do_calibrate(struct device *dev,
+                                    struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+       struct cyapa *cyapa = dev_get_drvdata(dev);
+       int ret, calibrate_ret;
+
+       /* 1. suspend Scanning*/
+       ret = cyapa_gen5_suspend_scanning(cyapa);
+       if (ret)
+               return ret;
+
+       /* 2. do mutual capacitance fine calibrate. */
+       calibrate_ret = cyapa_gen5_calibrate_pwcs(cyapa,
+                               CYAPA_SENSING_MODE_MUTUAL_CAP_FINE);
+       if (calibrate_ret)
+               goto resume_scanning;
+
+       /* 3. do self capacitance calibrate. */
+       calibrate_ret = cyapa_gen5_calibrate_pwcs(cyapa,
+                               CYAPA_SENSING_MODE_SELF_CAP);
+       if (calibrate_ret)
+               goto resume_scanning;
+
+resume_scanning:
+       /* 4. resume Scanning*/
+       ret = cyapa_gen5_resume_scanning(cyapa);
+       if (ret || calibrate_ret)
+               return ret ? ret : calibrate_ret;
+
+       return count;
+}
+
+static s32 two_complement_to_s32(s32 value, int num_bits)
+{
+       if (value >> (num_bits - 1))
+               value |=  -1 << num_bits;
+       return value;
+}
+
+static s32 cyapa_parse_structure_data(u8 data_format, u8 *buf, int buf_len)
+{
+       int data_size;
+       bool big_endian;
+       bool unsigned_type;
+       s32 value;
+
+       data_size = (data_format & 0x07);
+       big_endian = ((data_format & 0x10) == 0x00);
+       unsigned_type = ((data_format & 0x20) == 0x00);
+
+       if (buf_len < data_size)
+               return 0;
+
+       switch (data_size) {
+       case 1:
+               value  = buf[0];
+               break;
+       case 2:
+               if (big_endian)
+                       value = get_unaligned_be16(buf);
+               else
+                       value = get_unaligned_le16(buf);
+               break;
+       case 4:
+               if (big_endian)
+                       value = get_unaligned_be32(buf);
+               else
+                       value = get_unaligned_le32(buf);
+               break;
+       default:
+               /* should not happen, just as default case here. */
+               value = 0;
+               break;
+       }
+
+       if (!unsigned_type)
+               value = two_complement_to_s32(value, data_size * 8);
+
+       return value;
+}
+
+
+/*
+ * Read all the global mutual or self idac data or mutual or self local PWC
+ * data based on the @idac_data_type.
+ * If the input value of @data_size is 0, then means read global mutual or
+ * self idac data. For read global mutual idac data, @idac_max, @idac_min and
+ * @idac_ave are in order used to return the max value of global mutual idac
+ * data, the min value of global mutual idac and the average value of the
+ * global mutual idac data. For read global self idac data, @idac_max is used
+ * to return the global self cap idac data in Rx direction, @idac_min is used
+ * to return the global self cap idac data in Tx direction. @idac_ave is not
+ * used.
+ * If the input value of @data_size is not 0, than means read the mutual or
+ * self local PWC data. The @idac_max, @idac_min and @idac_ave are used to
+ * return the max, min and average value of the mutual or self local PWC data.
+ * Note, in order to raed mutual local PWC data, must read invoke this function
+ * to read the mutual global idac data firstly to set the correct Rx number
+ * value, otherwise, the read mutual idac and PWC data may not correct.
+ */
+static int cyapa_gen5_read_idac_data(struct cyapa *cyapa,
+               u8 cmd_code, u8 idac_data_type, int *data_size,
+               int *idac_max, int *idac_min, int *idac_ave)
+{
+       int ret;
+       int i;
+       u8 cmd[12];
+       u8 resp_data[256];
+       int resp_len;
+       int read_len;
+       int value;
+       u16 offset;
+       int read_elements;
+       bool read_global_idac;
+       int sum, count, max_element_cnt;
+       int tmp_max, tmp_min, tmp_ave, tmp_sum, tmp_count, tmp_max_elements;
+       int electrodes_rx;
+
+       if (cmd_code != GEN5_CMD_RETRIEVE_DATA_STRUCTURE ||
+               (idac_data_type != GEN5_RETRIEVE_MUTUAL_PWC_DATA &&
+               idac_data_type != GEN5_RETRIEVE_SELF_CAP_PWC_DATA) ||
+               !data_size || !idac_max || !idac_min || !idac_ave)
+               return -EINVAL;
+
+       *idac_max = INT_MIN;
+       *idac_min = INT_MAX;
+       sum = count = tmp_count = 0;
+       electrodes_rx = 0;
+       tmp_max_elements = 0;
+       if (*data_size == 0) {
+               /* Read global idac values firstly.
+                * Currently, no idac data exceed 4 bytes. */
+               read_global_idac = true;
+               offset = 0;
+               *data_size = 4;
+
+               if (idac_data_type == GEN5_RETRIEVE_MUTUAL_PWC_DATA) {
+                       if (cyapa->electrodes_rx == 0) {
+                               if (cyapa->electrodes_y > cyapa->electrodes_x) {
+                                       electrodes_rx = cyapa->electrodes_y;
+                                       tmp_max_elements = cyapa->electrodes_x;
+                               } else {
+                                       electrodes_rx = cyapa->electrodes_x;
+                                       tmp_max_elements = cyapa->electrodes_y;
+                               }
+                       } else {
+                               electrodes_rx = cyapa->electrodes_rx;
+                               tmp_max_elements = 0;  /* disable Rx detect. */
+                       }
+                       max_element_cnt = ((electrodes_rx + 7) / 8) * 8;
+                       tmp_max = INT_MIN;
+                       tmp_min = INT_MAX;
+                       tmp_ave = tmp_sum = tmp_count = 0;
+               } else
+                       max_element_cnt = 2;
+       } else {
+               read_global_idac = false;
+               if (*data_size > 4)
+                       *data_size = 4;
+               /* calculate the start offset in bytes of local PWC data. */
+               if (idac_data_type == GEN5_RETRIEVE_MUTUAL_PWC_DATA) {
+                       offset = ((cyapa->electrodes_rx + 7) / 8) * 8
+                                               * (*data_size);
+                       if (cyapa->electrodes_rx == cyapa->electrodes_x)
+                               tmp_count = cyapa->electrodes_y;
+                       else
+                               tmp_count = cyapa->electrodes_x;
+                       max_element_cnt = ((cyapa->electrodes_rx + 7) / 8) *
+                                               8 * tmp_count;
+               } else if (idac_data_type == GEN5_RETRIEVE_SELF_CAP_PWC_DATA) {
+                       offset = 2;
+                       max_element_cnt = cyapa->electrodes_x +
+                                               cyapa->electrodes_y;
+               }
+       }
+
+       do {
+               read_elements = (256 - 10) / (*data_size);
+               read_elements = min(read_elements, max_element_cnt - count);
+               read_len = read_elements * (*data_size);
+
+               cmd[0] = 0x04;
+               cmd[1] = 0x00;
+               cmd[2] = 0x0a;
+               cmd[3] = 0x00;
+               cmd[4] = GEN5_APP_CMD_REPORT_ID;
+               cmd[5] = 0x00;
+               cmd[6] = cmd_code;
+               put_unaligned_le16(offset, &cmd[7]); /* Read Offset[15:0] */
+               put_unaligned_le16(read_len, &cmd[9]); /* Read Length[15:0] */
+               cmd[11] = idac_data_type;
+               resp_len = 10 + read_len;
+               ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                               cmd, 12,
+                               resp_data, &resp_len,
+                               500, cyapa_gen5_sort_tsg_pip_app_resp_data);
+               if (ret || resp_len < 10 || resp_data[2] !=
+                                       GEN5_APP_RESP_REPORT_ID ||
+                               GET_GEN5_CMD_CODE(resp_data[4]) != cmd_code ||
+                               !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]) ||
+                               resp_data[6] != idac_data_type)
+                       return (ret < 0) ? ret : -EAGAIN;
+               read_len = get_unaligned_le16(&resp_data[7]);
+               if (read_len == 0)
+                       break;
+
+               *data_size = (resp_data[9] & GEN5_PWC_DATA_ELEMENT_SIZE_MASK);
+               if (read_len < *data_size)
+                       return -EINVAL;
+
+               if (read_global_idac &&
+                       idac_data_type == GEN5_RETRIEVE_SELF_CAP_PWC_DATA) {
+                       /* Rx's self global idac data. */
+                       *idac_max = cyapa_parse_structure_data(
+                                       resp_data[9], &resp_data[10],
+                                       *data_size);
+                       /* Tx's self global idac data. */
+                       *idac_min = cyapa_parse_structure_data(
+                                       resp_data[9],
+                                       &resp_data[10 + *data_size],
+                                       *data_size);
+                       break;
+               }
+
+               /* read mutual global idac or local mutual/self PWC data. */
+               offset += read_len;
+               for (i = 10; i < (read_len + 10); i += *data_size) {
+                       value = cyapa_parse_structure_data(resp_data[9],
+                                       &resp_data[i], *data_size);
+                       *idac_min = min(value, *idac_min);
+                       *idac_max = max(value, *idac_max);
+
+                       if (idac_data_type == GEN5_RETRIEVE_MUTUAL_PWC_DATA &&
+                               tmp_count < tmp_max_elements &&
+                               read_global_idac) {
+                               tmp_min = min(value, tmp_min);
+                               tmp_max = max(value, tmp_max);
+                               tmp_sum += value;
+                               tmp_count++;
+                       }
+
+                       sum += value;
+                       count++;
+
+                       if (count >= max_element_cnt)
+                               goto out;
+               }
+       } while (true);
+
+out:
+       *idac_ave = count ? (sum / count) : 0;
+
+       if (read_global_idac &&
+               idac_data_type == GEN5_RETRIEVE_MUTUAL_PWC_DATA) {
+               if (tmp_count == 0)
+                       return 0;
+               /* algorithm to detect electrodes_rx value. */
+               tmp_ave = tmp_sum / tmp_count;
+               tmp_count = tmp_ave * 15 / 100;
+               if (abs(tmp_ave - *idac_ave) > tmp_count ||
+                       (abs(tmp_ave - *idac_min) > (tmp_count * 2) &&
+                               *idac_min < tmp_min) ||
+                       (abs(*idac_max - tmp_ave) > (tmp_count * 2) &&
+                               *idac_max > tmp_max)) {
+                       /* overcount the mutual global idac values. */
+                       cyapa->electrodes_rx = tmp_max_elements;
+                       *idac_min = tmp_min;
+                       *idac_max = tmp_max;
+                       *idac_ave = tmp_ave;
+               } else
+                       cyapa->electrodes_rx = electrodes_rx;
+       }
+
+       return 0;
+}
+
+static int cyapa_gen5_read_mutual_idac_data(struct cyapa *cyapa,
+       int *gidac_mutual_max, int *gidac_mutual_min, int *gidac_mutual_ave,
+       int *lidac_mutual_max, int *lidac_mutual_min, int *lidac_mutual_ave)
+{
+       int ret;
+       int data_size;
+
+       *gidac_mutual_max = *gidac_mutual_min = *gidac_mutual_ave = 0;
+       *lidac_mutual_max = *lidac_mutual_min = *lidac_mutual_ave = 0;
+
+       data_size = 0;
+       ret = cyapa_gen5_read_idac_data(cyapa,
+               GEN5_CMD_RETRIEVE_DATA_STRUCTURE,
+               GEN5_RETRIEVE_MUTUAL_PWC_DATA,
+               &data_size,
+               gidac_mutual_max, gidac_mutual_min, gidac_mutual_ave);
+       if (ret)
+               return ret;
+
+       ret = cyapa_gen5_read_idac_data(cyapa,
+               GEN5_CMD_RETRIEVE_DATA_STRUCTURE,
+               GEN5_RETRIEVE_MUTUAL_PWC_DATA,
+               &data_size,
+               lidac_mutual_max, lidac_mutual_min, lidac_mutual_ave);
+       return ret;
+}
+
+static int cyapa_gen5_read_self_idac_data(struct cyapa *cyapa,
+               int *gidac_self_rx, int *gidac_self_tx,
+               int *lidac_self_max, int *lidac_self_min, int *lidac_self_ave)
+{
+       int ret;
+       int data_size;
+
+       *gidac_self_rx = *gidac_self_tx = 0;
+       *lidac_self_max = *lidac_self_min = *lidac_self_ave = 0;
+
+       data_size = 0;
+       ret = cyapa_gen5_read_idac_data(cyapa,
+               GEN5_CMD_RETRIEVE_DATA_STRUCTURE,
+               GEN5_RETRIEVE_SELF_CAP_PWC_DATA,
+               &data_size,
+               lidac_self_max, lidac_self_min, lidac_self_ave);
+       if (ret)
+               return ret;
+       *gidac_self_rx = *lidac_self_max;
+       *gidac_self_tx = *lidac_self_min;
+
+       ret = cyapa_gen5_read_idac_data(cyapa,
+               GEN5_CMD_RETRIEVE_DATA_STRUCTURE,
+               GEN5_RETRIEVE_SELF_CAP_PWC_DATA,
+               &data_size,
+               lidac_self_max, lidac_self_min, lidac_self_ave);
+       return ret;
+}
+
+static ssize_t cyapa_gen5_execute_panel_scan(struct cyapa *cyapa)
+{
+       int ret;
+       u8 cmd[7];
+       u8 resp_data[6];
+       int resp_len;
+
+       cmd[0] = 0x04;
+       cmd[1] = 0x00;
+       cmd[2] = 0x05;
+       cmd[3] = 0x00;
+       cmd[4] = GEN5_APP_CMD_REPORT_ID;
+       cmd[5] = 0x00;
+       cmd[6] = GEN5_CMD_EXECUTE_PANEL_SCAN;  /* command code */
+       resp_len = 6;
+       ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, 7,
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_app_resp_data);
+       if (ret || resp_len != 6 ||
+                       resp_data[2] != GEN5_APP_RESP_REPORT_ID ||
+                       GET_GEN5_CMD_CODE(resp_data[4]) !=
+                               GEN5_CMD_EXECUTE_PANEL_SCAN ||
+                       !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5])) {
+               cyapa_gen5_resume_scanning(cyapa);
+               return (ret < 0) ? ret : -EAGAIN;
+       }
+
+       return 0;
+}
+
+static int cyapa_gen5_read_panel_scan_raw_data(struct cyapa *cyapa,
+               u8 cmd_code, u8 raw_data_type, int raw_data_max_num,
+               int *raw_data_max, int *raw_data_min, int *raw_data_ave,
+               u8 *buffer)
+{
+       int ret;
+       int i;
+       u8 cmd[12];
+       u8 resp_data[256];  /* max bytes can transfer one time. */
+       int resp_len;
+       int read_elements;
+       int read_len;
+       u16 offset;
+       s32 value;
+       int sum, count;
+       int data_size;
+       s32 *intp;
+
+       if (cmd_code != GEN5_CMD_RETRIEVE_PANEL_SCAN ||
+               (raw_data_type > GEN5_PANEL_SCAN_SELF_DIFFCOUNT) ||
+               !raw_data_max || !raw_data_min || !raw_data_ave)
+               return -EINVAL;
+
+       intp = (s32 *)buffer;
+       *raw_data_max = INT_MIN;
+       *raw_data_min = INT_MAX;
+       sum = count = 0;
+       offset = 0;
+       read_elements = (256 - 10) / 4;  /* currently, max element size is 4. */
+       read_len = read_elements * 4;
+       do {
+               cmd[0] = 0x04;
+               cmd[1] = 0x00;
+               cmd[2] = 0x0a;
+               cmd[3] = 0x00;
+               cmd[4] = GEN5_APP_CMD_REPORT_ID;
+               cmd[5] = 0x00;
+               cmd[6] = cmd_code;  /* command code */
+               put_unaligned_le16(offset, &cmd[7]);
+               put_unaligned_le16(read_elements, &cmd[9]);
+               cmd[11] = raw_data_type;
+               resp_len = 10 + read_len;
+
+               ret = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+                       cmd, 12,
+                       resp_data, &resp_len,
+                       500, cyapa_gen5_sort_tsg_pip_app_resp_data);
+               if (ret || resp_len < 10 ||
+                               resp_data[2] != GEN5_APP_RESP_REPORT_ID ||
+                               (resp_data[4] & 0x7f) != cmd_code ||
+                               !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]) ||
+                               resp_data[6] != raw_data_type)
+                       return (ret < 0) ? ret : -EAGAIN;
+
+               read_elements = get_unaligned_le16(&resp_data[7]);
+               if (read_elements == 0)
+                       break;
+
+               data_size = (resp_data[9] & GEN5_PWC_DATA_ELEMENT_SIZE_MASK);
+               offset += read_elements;
+               if (read_elements) {
+                       for (i = 10;
+                            i < (read_elements * data_size + 10);
+                            i += data_size) {
+                               value = cyapa_parse_structure_data(resp_data[9],
+                                               &resp_data[i], data_size);
+                               *raw_data_min = min(value, *raw_data_min);
+                               *raw_data_max = max(value, *raw_data_max);
+
+                               if (intp)
+                                       put_unaligned_le32(value, &intp[count]);
+
+                               sum += value;
+                               count++;
+
+                       }
+               }
+
+               if (count >= raw_data_max_num)
+                       break;
+
+               read_elements = (sizeof(resp_data) - 10) / data_size;
+               read_len = read_elements * data_size;
+       } while (true);
+
+       *raw_data_ave = count ? (sum / count) : 0;
+
+       return 0;
+}
+
+static ssize_t cyapa_gen5_show_baseline(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
+{
+       struct cyapa *cyapa = dev_get_drvdata(dev);
+       int ret, err;
+       int gidac_mutual_max, gidac_mutual_min, gidac_mutual_ave;
+       int lidac_mutual_max, lidac_mutual_min, lidac_mutual_ave;
+       int gidac_self_rx, gidac_self_tx;
+       int lidac_self_max, lidac_self_min, lidac_self_ave;
+       int raw_cap_mutual_max, raw_cap_mutual_min, raw_cap_mutual_ave;
+       int raw_cap_self_max, raw_cap_self_min, raw_cap_self_ave;
+       int mutual_diffdata_max, mutual_diffdata_min, mutual_diffdata_ave;
+       int self_diffdata_max, self_diffdata_min, self_diffdata_ave;
+       int mutual_baseline_max, mutual_baseline_min, mutual_baseline_ave;
+       int self_baseline_max, self_baseline_min, self_baseline_ave;
+
+       /* 1. suspend Scanning*/
+       ret = cyapa_gen5_suspend_scanning(cyapa);
+       if (ret)
+               return ret;
+
+       /* 2.  read global and local mutual IDAC data. */
+       gidac_self_rx = gidac_self_tx = 0;
+       err = cyapa_gen5_read_mutual_idac_data(cyapa,
+                               &gidac_mutual_max, &gidac_mutual_min,
+                               &gidac_mutual_ave, &lidac_mutual_max,
+                               &lidac_mutual_min, &lidac_mutual_ave);
+       if (err)
+               goto resume_scanning;
+
+       /* 3.  read global and local self IDAC data. */
+       err = cyapa_gen5_read_self_idac_data(cyapa,
+                               &gidac_self_rx, &gidac_self_tx,
+                               &lidac_self_max, &lidac_self_min,
+                               &lidac_self_ave);
+       if (err)
+               goto resume_scanning;
+
+       /* 4. execuate panel scan. It must be executed before read data. */
+       err = cyapa_gen5_execute_panel_scan(cyapa);
+       if (err)
+               goto resume_scanning;
+
+       /* 5. retrive panel scan, mutual cap raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_MUTUAL_RAW_DATA,
+                               cyapa->electrodes_x * cyapa->electrodes_y,
+                               &raw_cap_mutual_max, &raw_cap_mutual_min,
+                               &raw_cap_mutual_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+       /* 6. retrive panel scan, self cap raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_SELF_RAW_DATA,
+                               cyapa->electrodes_x + cyapa->electrodes_y,
+                               &raw_cap_self_max, &raw_cap_self_min,
+                               &raw_cap_self_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+       /* 7. retrive panel scan, mutual cap diffcount raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_MUTUAL_DIFFCOUNT,
+                               cyapa->electrodes_x * cyapa->electrodes_y,
+                               &mutual_diffdata_max, &mutual_diffdata_min,
+                               &mutual_diffdata_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+       /* 8. retrive panel scan, self cap diffcount raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_SELF_DIFFCOUNT,
+                               cyapa->electrodes_x + cyapa->electrodes_y,
+                               &self_diffdata_max, &self_diffdata_min,
+                               &self_diffdata_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+       /* 9. retrive panel scan, mutual cap baseline raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_MUTUAL_BASELINE,
+                               cyapa->electrodes_x * cyapa->electrodes_y,
+                               &mutual_baseline_max, &mutual_baseline_min,
+                               &mutual_baseline_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+       /* 10. retrive panel scan, self cap baseline raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_SELF_BASELINE,
+                               cyapa->electrodes_x + cyapa->electrodes_y,
+                               &self_baseline_max, &self_baseline_min,
+                               &self_baseline_ave,
+                               NULL);
+       if (err)
+               goto resume_scanning;
+
+resume_scanning:
+       /* 11. resume Scanning*/
+       ret = cyapa_gen5_resume_scanning(cyapa);
+       if (ret || err)
+               return ret ? ret : err;
+
+       /* 12. output data strings */
+       ret = scnprintf(buf, PAGE_SIZE, "%d %d %d %d %d %d %d %d %d %d %d ",
+               gidac_mutual_min, gidac_mutual_max, gidac_mutual_ave,
+               lidac_mutual_min, lidac_mutual_max, lidac_mutual_ave,
+               gidac_self_rx, gidac_self_tx,
+               lidac_self_min, lidac_self_max, lidac_self_ave);
+       err = scnprintf(buf + ret, PAGE_SIZE - ret,
+               "%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n",
+               raw_cap_mutual_min, raw_cap_mutual_max, raw_cap_mutual_ave,
+               raw_cap_self_min, raw_cap_self_max, raw_cap_self_ave,
+               mutual_diffdata_min, mutual_diffdata_max, mutual_diffdata_ave,
+               self_diffdata_min, self_diffdata_max, self_diffdata_ave,
+               mutual_baseline_min, mutual_baseline_max, mutual_baseline_ave,
+               self_baseline_min, self_baseline_max, self_baseline_ave);
+       return ret + err;
+}
+
+static int cyapa_gen5_read_raw_data(struct cyapa *cyapa)
+{
+       int ret, err;
+       int raw_cap_mutual_max, raw_cap_mutual_min, raw_cap_mutual_ave;
+       int raw_cap_self_max, raw_cap_self_min, raw_cap_self_ave;
+       int offset;
+       int data_size, max, min, ave;
+       ktime_t time_mono;
+
+       offset = 0;
+       if (!cyapa->tp_raw_data)
+               return -ENOMEM;
+
+       /* 1. suspend Scanning.
+        * After suspend scanning, the raw data will not be updated,
+        * so the time of the raw data is before scanning suspended. */
+       time_mono = ktime_get();
+       ret = cyapa_gen5_suspend_scanning(cyapa);
+       if (ret)
+               return ret;
+
+       /* 2. get the correct electrodes_rx number. */
+       if (cyapa->electrodes_rx == 0) {
+               /* Through the read global idac interface to get the Rx number.
+                * this value is useful to the raw data map.*/
+               data_size = 0;
+               err = cyapa_gen5_read_idac_data(cyapa,
+                               GEN5_CMD_RETRIEVE_DATA_STRUCTURE,
+                               GEN5_RETRIEVE_MUTUAL_PWC_DATA,
+                               &data_size, &max, &min, &ave);
+               if (err || cyapa->electrodes_rx == 0)
+                       goto resume_scanning;
+       }
+
+       /* 3. execuate panel scan. It must be executed before read data. */
+       err = cyapa_gen5_execute_panel_scan(cyapa);
+       if (err)
+               goto resume_scanning;
+
+       /* 4. retrive panel scan, mutual cap raw data. */
+       offset = GEN5_RAW_DATA_HEAD_SIZE;
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_MUTUAL_DIFFCOUNT,
+                               cyapa->electrodes_x * cyapa->electrodes_y,
+                               &raw_cap_mutual_max, &raw_cap_mutual_min,
+                               &raw_cap_mutual_ave,
+                               cyapa->tp_raw_data + offset);
+       if (err)
+               goto resume_scanning;
+
+       offset += sizeof(s32) * cyapa->electrodes_x * cyapa->electrodes_y;
+
+       /* 5. retrive panel scan, self cap raw data. */
+       err = cyapa_gen5_read_panel_scan_raw_data(cyapa,
+                               GEN5_CMD_RETRIEVE_PANEL_SCAN,
+                               GEN5_PANEL_SCAN_SELF_DIFFCOUNT,
+                               cyapa->electrodes_x + cyapa->electrodes_y,
+                               &raw_cap_self_max, &raw_cap_self_min,
+                               &raw_cap_self_ave,
+                               cyapa->tp_raw_data + offset);
+       if (err)
+               goto resume_scanning;
+
+       offset += sizeof(s32) * (cyapa->electrodes_x + cyapa->electrodes_y);
+
+resume_scanning:
+       /* 6. resume Scanning*/
+       ret = cyapa_gen5_resume_scanning(cyapa);
+       if (ret || err)
+               return ret ? ret : err;
+
+       *((struct timeval *)&cyapa->tp_raw_data[0]) =
+                                               ktime_to_timeval(time_mono);
+       cyapa->tp_raw_data[16] = (u8)cyapa->electrodes_x;
+       cyapa->tp_raw_data[17] = (u8)cyapa->electrodes_y;
+       cyapa->tp_raw_data[18] = (u8)cyapa->x_origin;
+       cyapa->tp_raw_data[19] = (u8)cyapa->y_origin;
+       cyapa->tp_raw_data[20] = (u8)sizeof(s32);
+       cyapa->tp_raw_data[21] = (u8)sizeof(s32);
+       cyapa->tp_raw_data[22] = (u8)cyapa->electrodes_rx;
+       cyapa->tp_raw_data[23] = 0;  /* reserved. */
+
+       cyapa->tp_raw_data_size = offset;
+       return 0;
+}
+
 static bool cyapa_gen5_sort_system_info_data(struct cyapa *cyapa,
                u8 *buf, int len)
 {
@@ -3050,19 +4256,19 @@ static int cyapa_check_is_operational(struct cyapa *cyapa)

        switch (cyapa->gen) {
        case CYAPA_GEN5:
-               cyapa->cyapa_check_fw = NULL;
-               cyapa->cyapa_bl_enter = NULL;
+               cyapa->cyapa_check_fw = cyapa_gen5_check_fw;
+               cyapa->cyapa_bl_enter = cyapa_gen5_bl_enter;
                cyapa->cyapa_bl_activate = NULL;
-               cyapa->cyapa_bl_initiate = NULL;
-               cyapa->cyapa_update_fw = NULL;
+               cyapa->cyapa_bl_initiate = cyapa_gen5_bl_initiate;
+               cyapa->cyapa_update_fw = cyapa_gen5_do_fw_update;
                cyapa->cyapa_bl_verify_app_integrity = NULL;
                cyapa->cyapa_bl_deactivate = NULL;
-               cyapa->cyapa_show_baseline = NULL;
-               cyapa->cyapa_calibrate_store = NULL;
+               cyapa->cyapa_show_baseline = cyapa_gen5_show_baseline;
+               cyapa->cyapa_calibrate_store = cyapa_gen5_do_calibrate;
                cyapa->cyapa_irq_handler = cyapa_gen5_irq_handler;
                cyapa->cyapa_set_power_mode = cyapa_gen5_set_power_mode;
-               cyapa->cyapa_read_fw = NULL;
-               cyapa->cyapa_read_raw_data = NULL;
+               cyapa->cyapa_read_fw = cyapa_gen5_read_fw;
+               cyapa->cyapa_read_raw_data = cyapa_gen5_read_raw_data;

                cyapa_enable_irq_save(cyapa);
                ret = cyapa_gen5_do_operational_check(cyapa);
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