Input: iqs5xx - remove superfluous revision validation

The vendor-assigned firmware project number is restricted to the
generic project number (15); however the vendor may assign other
project numbers to specific applications and customers.

These custom project numbers may be based on forwards-compatible
firmware revision 1.x. However, the driver unnecessarily rejects
anything older than firmware revision 2.0.

To support other applications, remove these unnecessarily strict
checks and enter the bootloader only for truly incompatible A000
devices.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20210313191236.4366-5-jeff@labundy.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c
index f36d170e14b20e964a5e075208aa08728416d33b..0920516124c766bb8856f9d303c8da297f2f6893 100644 (file)
--- a/drivers/input/touchscreen/iqs5xx.c
+++ b/drivers/input/touchscreen/iqs5xx.c
@@ -36,9 +36,6 @@
 #define IQS5XX_PROD_NUM_IQS550 40
 #define IQS5XX_PROD_NUM_IQS572 58
 #define IQS5XX_PROD_NUM_IQS525 52
-#define IQS5XX_PROJ_NUM_A000   0
-#define IQS5XX_PROJ_NUM_B000   15
-#define IQS5XX_MAJOR_VER_MIN   2
 
 #define IQS5XX_SHOW_RESET      BIT(7)
 #define IQS5XX_ACK_RESET       BIT(7)
@@ -87,7 +84,6 @@
 #define IQS5XX_BL_CMD_CRC      0x03
 #define IQS5XX_BL_BLK_LEN_MAX  64
 #define IQS5XX_BL_ID           0x0200
-#define IQS5XX_BL_STATUS_AVAIL 0xA5
 #define IQS5XX_BL_STATUS_NONE  0xEE
 #define IQS5XX_BL_CRC_PASS     0x00
 #define IQS5XX_BL_CRC_FAIL     0x01
@@ -573,7 +569,7 @@ static int iqs5xx_dev_init(struct i2c_client *client)
         * the missing zero is prepended).
         */
        buf[0] = 0;
-       dev_id_info = (struct iqs5xx_dev_id_info *)&buf[(buf[1] > 0) ? 0 : 1];
+       dev_id_info = (struct iqs5xx_dev_id_info *)&buf[buf[1] ? 0 : 1];
 
        switch (be16_to_cpu(dev_id_info->prod_num)) {
        case IQS5XX_PROD_NUM_IQS550:
@@ -586,36 +582,16 @@ static int iqs5xx_dev_init(struct i2c_client *client)
                return -EINVAL;
        }
 
-       switch (be16_to_cpu(dev_id_info->proj_num)) {
-       case IQS5XX_PROJ_NUM_A000:
-               dev_err(&client->dev, "Unsupported project number: %u\n",
-                       be16_to_cpu(dev_id_info->proj_num));
-               return iqs5xx_bl_open(client);
-       case IQS5XX_PROJ_NUM_B000:
-               break;
-       default:
-               dev_err(&client->dev, "Unrecognized project number: %u\n",
-                       be16_to_cpu(dev_id_info->proj_num));
-               return -EINVAL;
-       }
-
-       if (dev_id_info->major_ver < IQS5XX_MAJOR_VER_MIN) {
-               dev_err(&client->dev, "Unsupported major version: %u\n",
-                       dev_id_info->major_ver);
+       /*
+        * With the product number recognized yet shifted by one byte, open the
+        * bootloader and wait for user space to convert the A000 device into a
+        * B000 device via new firmware.
+        */
+       if (buf[1]) {
+               dev_err(&client->dev, "Opening bootloader for A000 device\n");
                return iqs5xx_bl_open(client);
        }
 
-       switch (dev_id_info->bl_status) {
-       case IQS5XX_BL_STATUS_AVAIL:
-       case IQS5XX_BL_STATUS_NONE:
-               break;
-       default:
-               dev_err(&client->dev,
-                       "Unrecognized bootloader status: 0x%02X\n",
-                       dev_id_info->bl_status);
-               return -EINVAL;
-       }
-
        error = iqs5xx_read_burst(client, IQS5XX_EXP_FILE,
                                  iqs5xx->exp_file, sizeof(iqs5xx->exp_file));
        if (error)