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authorDaniel Kurtz <djkurtz@chromium.org>2012-06-28 21:08:14 +0800
committerHenrik Rydberg <rydberg@euromail.se>2012-06-29 15:58:04 +0200
commit23003a8496b3f8100ed215dfda438cece5745545 (patch)
treee68d4437c3bbb43bcc5411ff86de2ac66967c6dd /drivers/input/touchscreen
parentcf94bc09c89c923d339c68cf89360c02578ceee3 (diff)
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>
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/atmel_mxt_ts.c26
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;
}