[PATCH v2 11/14] input: cyapa: add gen5 trackpad device firmware update function supported

[Dudley Du]

Add firmware image update function supported for gen5 trackpad device,
which its function is supplied through cyapa core update_fw interface.
TEST=test on Chomebooks.

Signed-off-by: Du, Dudley <dudl@xxxxxxxxxxx>
---
diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 6b8441f..e484569 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_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index 00ca3a6..e720eed 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -18,6 +18,7 @@
 #include <linux/completion.h>
 #include <linux/slab.h>
 #include <linux/unaligned/access_ok.h>
+#include <linux/crc-itu-t.h>
 #include "cyapa.h"


@@ -856,6 +857,86 @@ out:
        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)
@@ -902,6 +983,216 @@ 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_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_change_power_state(struct cyapa *cyapa, u8 power_state)
 {
        int ret;
@@ -1568,11 +1859,11 @@ static void cyapa_gen5_irq_handler(struct cyapa *cyapa)
 }

 const struct cyapa_dev_ops cyapa_gen5_ops = {
+       cyapa_gen5_check_fw,
+       cyapa_gen5_bl_enter,
        NULL,
-       NULL,
-       NULL,
-       NULL,
-       NULL,
+       cyapa_gen5_bl_initiate,
+       cyapa_gen5_do_fw_update,
        NULL,
        NULL,

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