Input: atmel_mxt_ts - read ID information block in one i2c transaction

Reading the whole info block in one i2c transaction speeds up driver
probe significantly, especially on slower i2c busses.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 3 insertions, 23 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 99d5210c7ae8..fac379146546 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -36,6 +36,7 @@
 #define MXT_FW_NAME             "maxtouch.fw"
 
 /* Registers */
+#define MXT_INFO                0x00
 #define MXT_FAMILY_ID           0x00
 #define MXT_VARIANT_ID          0x01
 #define MXT_VERSION             0x02
@@ -760,32 +761,11 @@ static int mxt_get_info(struct mxt_data *data)
         struct i2c_client *client = data->client;
         struct mxt_info *info = &data->info;
         int error;
-        u8 val;
-
-        error = mxt_read_reg(client, MXT_FAMILY_ID, &val);
-        if (error)
-                return error;
-        info->family_id = val;
-
-        error = mxt_read_reg(client, MXT_VARIANT_ID, &val);
-        if (error)
-                return error;
-        info->variant_id = val;
-
-        error = mxt_read_reg(client, MXT_VERSION, &val);
-        if (error)
-                return error;
-        info->version = val;
-
-        error = mxt_read_reg(client, MXT_BUILD, &val);
-        if (error)
-                return error;
-        info->build = val;
 
-        error = mxt_read_reg(client, MXT_OBJECT_NUM, &val);
+        /* Read 7-byte info block starting at address 0 */
+        error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info);
         if (error)
                 return error;
-        info->object_num = val;
 
         return 0;
 }