@@ -60,8 +60,11 @@ struct omnia_leds {
static int omnia_cmd_write_u8(const struct i2c_client *client, u8 cmd, u8 val)
{
u8 buf[2] = { cmd, val };
+ int ret;
+
+ ret = i2c_master_send(client, buf, sizeof(buf));
- return i2c_master_send(client, buf, sizeof(buf));
+ return ret < 0 ? ret : 0;
}
static int omnia_cmd_read_raw(struct i2c_adapter *adapter, u8 addr, u8 cmd,
@@ -81,7 +84,7 @@ static int omnia_cmd_read_raw(struct i2c_adapter *adapter, u8 addr, u8 cmd,
ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
if (likely(ret == ARRAY_SIZE(msgs)))
- return len;
+ return 0;
else if (ret < 0)
return ret;
else
@@ -91,11 +94,11 @@ static int omnia_cmd_read_raw(struct i2c_adapter *adapter, u8 addr, u8 cmd,
static int omnia_cmd_read_u8(const struct i2c_client *client, u8 cmd)
{
u8 reply;
- int ret;
+ int err;
- ret = omnia_cmd_read_raw(client->adapter, client->addr, cmd, &reply, 1);
- if (ret < 0)
- return ret;
+ err = omnia_cmd_read_raw(client->adapter, client->addr, cmd, &reply, 1);
+ if (err)
+ return err;
return reply;
}
@@ -236,7 +239,7 @@ static void omnia_hwtrig_deactivate(struct led_classdev *cdev)
mutex_unlock(&leds->lock);
- if (err < 0)
+ if (err)
dev_err(cdev->dev, "Cannot put LED to software mode: %i\n",
err);
}
@@ -302,7 +305,7 @@ static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
ret = omnia_cmd_write_u8(client, CMD_LED_MODE,
CMD_LED_MODE_LED(led->reg) |
CMD_LED_MODE_USER);
- if (ret < 0) {
+ if (ret) {
dev_err(dev, "Cannot set LED %pOF to software mode: %i\n", np,
ret);
return ret;
@@ -311,7 +314,7 @@ static int omnia_led_register(struct i2c_client *client, struct omnia_led *led,
/* disable the LED */
ret = omnia_cmd_write_u8(client, CMD_LED_STATE,
CMD_LED_STATE_LED(led->reg));
- if (ret < 0) {
+ if (ret) {
dev_err(dev, "Cannot set LED %pOF brightness: %i\n", np, ret);
return ret;
}
@@ -364,7 +367,7 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
{
struct i2c_client *client = to_i2c_client(dev);
unsigned long brightness;
- int ret;
+ int err;
if (kstrtoul(buf, 10, &brightness))
return -EINVAL;
@@ -372,9 +375,9 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *a,
if (brightness > 100)
return -EINVAL;
- ret = omnia_cmd_write_u8(client, CMD_LED_SET_BRIGHTNESS, brightness);
+ err = omnia_cmd_write_u8(client, CMD_LED_SET_BRIGHTNESS, brightness);
- return ret < 0 ? ret : count;
+ return err ?: count;
}
static DEVICE_ATTR_RW(brightness);
@@ -403,7 +406,7 @@ static ssize_t gamma_correction_store(struct device *dev,
struct i2c_client *client = to_i2c_client(dev);
struct omnia_leds *leds = i2c_get_clientdata(client);
bool val;
- int ret;
+ int err;
if (!leds->has_gamma_correction)
return -EOPNOTSUPP;
@@ -411,9 +414,9 @@ static ssize_t gamma_correction_store(struct device *dev,
if (kstrtobool(buf, &val) < 0)
return -EINVAL;
- ret = omnia_cmd_write_u8(client, CMD_SET_GAMMA_CORRECTION, val);
+ err = omnia_cmd_write_u8(client, CMD_SET_GAMMA_CORRECTION, val);
- return ret < 0 ? ret : count;
+ return err ?: count;
}
static DEVICE_ATTR_RW(gamma_correction);
@@ -431,7 +434,7 @@ static int omnia_mcu_get_features(const struct i2c_client *client)
err = omnia_cmd_read_raw(client->adapter, OMNIA_MCU_I2C_ADDR,
CMD_GET_STATUS_WORD, &reply, sizeof(reply));
- if (err < 0)
+ if (err)
return err;
/* Check whether MCU firmware supports the CMD_GET_FEAUTRES command */
@@ -440,7 +443,7 @@ static int omnia_mcu_get_features(const struct i2c_client *client)
err = omnia_cmd_read_raw(client->adapter, OMNIA_MCU_I2C_ADDR,
CMD_GET_FEATURES, &reply, sizeof(reply));
- if (err < 0)
+ if (err)
return err;
return le16_to_cpu(reply);
I have improperly refactored commits 4d5ed2621c24 ("leds: turris-omnia: Make set_brightness() more efficient") and aaf38273cf76 ("leds: turris-omnia: Support HW controlled mode via private trigger") after Lee requested a change in API semantics of the new functions I introduced in commit 28350bc0ac77 ("leds: turris-omnia: Do not use SMBUS calls"). Before the change, the function omnia_cmd_write_u8() returned 0 on success, and afterwards it returned a positive value (number of bytes written). The latter version was applied, but the following commits did not properly account for this change. This results in non-functional LED's .brightness_set_blocking() and trigger's .activate() methods. The main reasoning behind the semantics change was that read/write methods should return the number of read/written bytes on success. It was pointed to me [1] that this is not always true (for example the regmap API does not do so), and since the driver never uses this number of read/written bytes information, I decided to fix this issue by changing the functions to the original semantics (return 0 on success). [1] https://lore.kernel.org/linux-gpio/ZQnn+Gi0xVlsGCYA@smile.fi.intel.com/ Fixes: 28350bc0ac77 ("leds: turris-omnia: Do not use SMBUS calls") Signed-off-by: Marek Behún <kabel@kernel.org> --- drivers/leds/leds-turris-omnia.c | 37 +++++++++++++++++--------------- 1 file changed, 20 insertions(+), 17 deletions(-)