bq20z75: Add i2c retry mechanism
With the support of platform data, now adding support for option i2c
retries on read/write failures. Ths is specified through the optional
platform data.
Signed-off-by: Rhyland Klein <rklein@nvidia.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c
index a51e98d..e82d10e 100644
--- a/drivers/power/bq20z75.c
+++ b/drivers/power/bq20z75.c
@@ -156,30 +156,55 @@
static int bq20z75_read_word_data(struct i2c_client *client, u8 address)
{
- s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
- ret = i2c_smbus_read_word_data(client, address);
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_read_word_data(client, address);
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
if (ret < 0) {
- dev_err(&client->dev,
+ dev_warn(&client->dev,
"%s: i2c read at address 0x%x failed\n",
__func__, address);
return ret;
}
+
return le16_to_cpu(ret);
}
static int bq20z75_write_word_data(struct i2c_client *client, u8 address,
u16 value)
{
- s32 ret;
+ struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client);
+ s32 ret = 0;
+ int retries = 1;
- ret = i2c_smbus_write_word_data(client, address, le16_to_cpu(value));
+ if (bq20z75_device->pdata)
+ retries = max(bq20z75_device->pdata->i2c_retry_count + 1, 1);
+
+ while (retries > 0) {
+ ret = i2c_smbus_write_word_data(client, address,
+ le16_to_cpu(value));
+ if (ret >= 0)
+ break;
+ retries--;
+ }
+
if (ret < 0) {
- dev_err(&client->dev,
+ dev_warn(&client->dev,
"%s: i2c write to address 0x%x failed\n",
__func__, address);
return ret;
}
+
return 0;
}