Input: goodix - use string-based chip ID

For Goodix GT917S chip, the chip ID string is "917S", which contains not
only numbers now.

Use string-based chip ID in the driver to support this chip and further
chips with alphanumber ID.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Link: https://lore.kernel.org/r/20200228010146.12215-3-icenowy@aosc.io
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index 9805372..ca5e82e 100644 (file)
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -79,6 +79,13 @@ struct goodix_chip_data {
        void (*calc_config_checksum)(struct goodix_ts_data *ts);
 };
 
+struct goodix_chip_id {
+       const char *id;
+       const struct goodix_chip_data *data;
+};
+
+#define GOODIX_ID_MAX_LEN      4
+
 struct goodix_ts_data {
        struct i2c_client *client;
        struct input_dev *input_dev;
@@ -92,7 +99,7 @@ struct goodix_ts_data {
        struct gpio_desc *gpiod_rst;
        int gpio_count;
        int gpio_int_idx;
-       u16 id;
+       char id[GOODIX_ID_MAX_LEN + 1];
        u16 version;
        const char *cfg_name;
        bool reset_controller_at_probe;
@@ -140,6 +147,22 @@ static const struct goodix_chip_data gt9x_chip_data = {
        .calc_config_checksum   = goodix_calc_cfg_checksum_8,
 };
 
+static const struct goodix_chip_id goodix_chip_ids[] = {
+       { .id = "1151", .data = &gt1x_chip_data },
+       { .id = "5663", .data = &gt1x_chip_data },
+       { .id = "5688", .data = &gt1x_chip_data },
+
+       { .id = "911", .data = &gt911_chip_data },
+       { .id = "9271", .data = &gt911_chip_data },
+       { .id = "9110", .data = &gt911_chip_data },
+       { .id = "927", .data = &gt911_chip_data },
+       { .id = "928", .data = &gt911_chip_data },
+
+       { .id = "912", .data = &gt967_chip_data },
+       { .id = "967", .data = &gt967_chip_data },
+       { }
+};
+
 static const unsigned long goodix_irq_flags[] = {
        IRQ_TYPE_EDGE_RISING,
        IRQ_TYPE_EDGE_FALLING,
@@ -276,28 +299,16 @@ static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
        return goodix_i2c_write(client, reg, &value, sizeof(value));
 }
 
-static const struct goodix_chip_data *goodix_get_chip_data(u16 id)
+static const struct goodix_chip_data *goodix_get_chip_data(const char *id)
 {
-       switch (id) {
-       case 1151:
-       case 5663:
-       case 5688:
-               return &gt1x_chip_data;
-
-       case 911:
-       case 9271:
-       case 9110:
-       case 927:
-       case 928:
-               return &gt911_chip_data;
-
-       case 912:
-       case 967:
-               return &gt967_chip_data;
+       unsigned int i;
 
-       default:
-               return &gt9x_chip_data;
+       for (i = 0; goodix_chip_ids[i].id; i++) {
+               if (!strcmp(goodix_chip_ids[i].id, id))
+                       return goodix_chip_ids[i].data;
        }
+
+       return &gt9x_chip_data;
 }
 
 static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
@@ -951,7 +962,7 @@ static int goodix_read_version(struct goodix_ts_data *ts)
 {
        int error;
        u8 buf[6];
-       char id_str[5];
+       char id_str[GOODIX_ID_MAX_LEN + 1];
 
        error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf));
        if (error) {
@@ -959,14 +970,13 @@ static int goodix_read_version(struct goodix_ts_data *ts)
                return error;
        }
 
-       memcpy(id_str, buf, 4);
-       id_str[4] = 0;
-       if (kstrtou16(id_str, 10, &ts->id))
-               ts->id = 0x1001;
+       memcpy(id_str, buf, GOODIX_ID_MAX_LEN);
+       id_str[GOODIX_ID_MAX_LEN] = 0;
+       strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1);
 
        ts->version = get_unaligned_le16(&buf[4]);
 
-       dev_info(&ts->client->dev, "ID %d, version: %04x\n", ts->id,
+       dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id,
                 ts->version);
 
        return 0;
@@ -1025,7 +1035,8 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
        ts->input_dev->phys = "input/ts";
        ts->input_dev->id.bustype = BUS_I2C;
        ts->input_dev->id.vendor = 0x0416;
-       ts->input_dev->id.product = ts->id;
+       if (kstrtou16(ts->id, 10, &ts->input_dev->id.product))
+               ts->input_dev->id.product = 0x1001;
        ts->input_dev->id.version = ts->version;
 
        ts->input_dev->keycode = ts->keymap;
@@ -1228,7 +1239,7 @@ reset:
        if (ts->load_cfg_from_disk) {
                /* update device config */
                ts->cfg_name = devm_kasprintf(&client->dev, GFP_KERNEL,
-                                             "goodix_%d_cfg.bin", ts->id);
+                                             "goodix_%s_cfg.bin", ts->id);
                if (!ts->cfg_name)
                        return -ENOMEM;