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-rw-r--r--drivers/leds/leds-lm3530.c32
-rw-r--r--include/linux/led-lm3530.h9
2 files changed, 33 insertions, 8 deletions
diff --git a/drivers/leds/leds-lm3530.c b/drivers/leds/leds-lm3530.c
index ce79523a4d10..a889311eead1 100644
--- a/drivers/leds/leds-lm3530.c
+++ b/drivers/leds/leds-lm3530.c
@@ -157,6 +157,7 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
u32 als_vmin, als_vmax, als_vstep;
struct lm3530_platform_data *pltfm = drvdata->pdata;
struct i2c_client *client = drvdata->client;
+ struct lm3530_pwm_data *pwm = &pltfm->pwm_data;
gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT);
@@ -240,6 +241,15 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
}
for (i = 0; i < LM3530_REG_MAX; i++) {
+ /* do not update brightness register when pwm mode */
+ if (lm3530_reg[i] == LM3530_BRT_CTRL_REG &&
+ drvdata->mode == LM3530_BL_MODE_PWM) {
+ if (pwm->pwm_set_intensity)
+ pwm->pwm_set_intensity(reg_val[i],
+ drvdata->led_dev.max_brightness);
+ continue;
+ }
+
ret = i2c_smbus_write_byte_data(client,
lm3530_reg[i], reg_val[i]);
if (ret)
@@ -255,6 +265,9 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev,
int err;
struct lm3530_data *drvdata =
container_of(led_cdev, struct lm3530_data, led_dev);
+ struct lm3530_platform_data *pdata = drvdata->pdata;
+ struct lm3530_pwm_data *pwm = &pdata->pwm_data;
+ u8 max_brightness = led_cdev->max_brightness;
switch (drvdata->mode) {
case LM3530_BL_MODE_MANUAL:
@@ -288,6 +301,8 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev,
case LM3530_BL_MODE_ALS:
break;
case LM3530_BL_MODE_PWM:
+ if (pwm->pwm_set_intensity)
+ pwm->pwm_set_intensity(brt_val, max_brightness);
break;
default:
break;
@@ -318,23 +333,24 @@ static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3530_data *drvdata;
+ struct lm3530_pwm_data *pwm;
+ u8 max_brightness;
int mode, err;
drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
+ pwm = &drvdata->pdata->pwm_data;
+ max_brightness = led_cdev->max_brightness;
mode = lm3530_get_mode_from_str(buf);
if (mode < 0) {
dev_err(dev, "Invalid mode\n");
return -EINVAL;
}
- if (mode == LM3530_BL_MODE_MANUAL)
- drvdata->mode = LM3530_BL_MODE_MANUAL;
- else if (mode == LM3530_BL_MODE_ALS)
- drvdata->mode = LM3530_BL_MODE_ALS;
- else if (mode == LM3530_BL_MODE_PWM) {
- dev_err(dev, "PWM mode not supported\n");
- return -EINVAL;
- }
+ drvdata->mode = mode;
+
+ /* set pwm to low if unnecessary */
+ if (mode != LM3530_BL_MODE_PWM && pwm->pwm_set_intensity)
+ pwm->pwm_set_intensity(0, max_brightness);
err = lm3530_init_registers(drvdata);
if (err) {
diff --git a/include/linux/led-lm3530.h b/include/linux/led-lm3530.h
index 8eb12357a110..eeae6e742471 100644
--- a/include/linux/led-lm3530.h
+++ b/include/linux/led-lm3530.h
@@ -72,6 +72,12 @@ enum lm3530_als_mode {
LM3530_INPUT_CEIL, /* Max of ALS1 and ALS2 */
};
+/* PWM Platform Specific Data */
+struct lm3530_pwm_data {
+ void (*pwm_set_intensity) (int brightness, int max_brightness);
+ int (*pwm_get_intensity) (int max_brightness);
+};
+
/**
* struct lm3530_platform_data
* @mode: mode of operation i.e. Manual, ALS or PWM
@@ -87,6 +93,7 @@ enum lm3530_als_mode {
* @als_vmin: als input voltage calibrated for max brightness in mV
* @als_vmax: als input voltage calibrated for min brightness in mV
* @brt_val: brightness value (0-255)
+ * @pwm_data: PWM control functions (only valid when the mode is PWM)
*/
struct lm3530_platform_data {
enum lm3530_mode mode;
@@ -107,6 +114,8 @@ struct lm3530_platform_data {
u32 als_vmax;
u8 brt_val;
+
+ struct lm3530_pwm_data pwm_data;
};
#endif /* _LINUX_LED_LM3530_H__ */