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path: root/drivers/leds/leds-lp5523.c
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Diffstat (limited to 'drivers/leds/leds-lp5523.c')
-rw-r--r--drivers/leds/leds-lp5523.c103
1 files changed, 42 insertions, 61 deletions
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
index 1e11fcc08b28..d0c4068ecddd 100644
--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -105,7 +105,6 @@
#define SHIFT_MASK(id) (((id) - 1) * 2)
struct lp5523_engine {
- const struct attribute_group *attributes;
int id;
u8 mode;
u8 prog_page;
@@ -134,15 +133,18 @@ struct lp5523_chip {
u8 num_leds;
};
-#define cdev_to_led(c) container_of(c, struct lp5523_led, cdev)
+static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
+{
+ return container_of(cdev, struct lp5523_led, cdev);
+}
-static struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
+static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
{
return container_of(engine, struct lp5523_chip,
engines[engine->id - 1]);
}
-static struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
+static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
{
return container_of(led, struct lp5523_chip,
leds[led->id]);
@@ -200,13 +202,9 @@ static int lp5523_configure(struct i2c_client *client)
{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
};
- lp5523_write(client, LP5523_REG_RESET, 0xff);
-
- usleep_range(10000, 100000);
-
ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
- /* Chip startup time after reset is 500 us */
- usleep_range(1000, 10000);
+ /* Chip startup time is 500 us, 1 - 2 ms gives some margin */
+ usleep_range(1000, 2000);
ret |= lp5523_write(client, LP5523_REG_CONFIG,
LP5523_AUTO_INC | LP5523_PWR_SAVE |
@@ -243,8 +241,8 @@ static int lp5523_configure(struct i2c_client *client)
return -1;
}
- /* Wait 3ms and check the engine status */
- usleep_range(3000, 20000);
+ /* Let the programs run for couple of ms and check the engine status */
+ usleep_range(3000, 6000);
lp5523_read(client, LP5523_REG_STATUS, &status);
status &= LP5523_ENG_STATUS_MASK;
@@ -404,14 +402,23 @@ static ssize_t store_engine_leds(struct device *dev,
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
u16 mux = 0;
+ ssize_t ret;
if (lp5523_mux_parse(buf, &mux, len))
return -EINVAL;
+ mutex_lock(&chip->lock);
+ ret = -EINVAL;
+ if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
+ goto leave;
+
if (lp5523_load_mux(&chip->engines[nr - 1], mux))
- return -EINVAL;
+ goto leave;
- return len;
+ ret = len;
+leave:
+ mutex_unlock(&chip->lock);
+ return ret;
}
#define store_leds(nr) \
@@ -449,10 +456,10 @@ static ssize_t lp5523_selftest(struct device *dev,
/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
LP5523_EN_LEDTEST | 16);
- usleep_range(3000, 10000);
+ usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
if (!(status & LP5523_LEDTEST_DONE))
- usleep_range(3000, 10000);
+ usleep_range(3000, 6000); /* Was not ready. Wait little bit */
ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
vdd--; /* There may be some fluctuation in measurement */
@@ -468,16 +475,16 @@ static ssize_t lp5523_selftest(struct device *dev,
chip->pdata->led_config[i].led_current);
lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
- /* let current stabilize 2ms before measurements start */
- usleep_range(2000, 10000);
+ /* let current stabilize 2 - 4ms before measurements start */
+ usleep_range(2000, 4000);
lp5523_write(chip->client,
LP5523_REG_LED_TEST_CTRL,
LP5523_EN_LEDTEST | i);
- /* ledtest takes 2.7ms */
- usleep_range(3000, 10000);
+ /* ADC conversion time is 2.7 ms typically */
+ usleep_range(3000, 6000);
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
if (!(status & LP5523_LEDTEST_DONE))
- usleep_range(3000, 10000);
+ usleep_range(3000, 6000);/* Was not ready. Wait. */
ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
@@ -557,7 +564,11 @@ static int lp5523_do_store_load(struct lp5523_engine *engine,
mutex_lock(&chip->lock);
- ret = lp5523_load_program(engine, pattern);
+ if (engine->mode == LP5523_CMD_LOAD)
+ ret = lp5523_load_program(engine, pattern);
+ else
+ ret = -EINVAL;
+
mutex_unlock(&chip->lock);
if (ret) {
@@ -738,37 +749,18 @@ static struct attribute *lp5523_attributes[] = {
&dev_attr_engine2_mode.attr,
&dev_attr_engine3_mode.attr,
&dev_attr_selftest.attr,
- NULL
-};
-
-static struct attribute *lp5523_engine1_attributes[] = {
&dev_attr_engine1_load.attr,
&dev_attr_engine1_leds.attr,
- NULL
-};
-
-static struct attribute *lp5523_engine2_attributes[] = {
&dev_attr_engine2_load.attr,
&dev_attr_engine2_leds.attr,
- NULL
-};
-
-static struct attribute *lp5523_engine3_attributes[] = {
&dev_attr_engine3_load.attr,
&dev_attr_engine3_leds.attr,
- NULL
};
static const struct attribute_group lp5523_group = {
.attrs = lp5523_attributes,
};
-static const struct attribute_group lp5523_engine_group[] = {
- {.attrs = lp5523_engine1_attributes },
- {.attrs = lp5523_engine2_attributes },
- {.attrs = lp5523_engine3_attributes },
-};
-
static int lp5523_register_sysfs(struct i2c_client *client)
{
struct device *dev = &client->dev;
@@ -789,10 +781,6 @@ static void lp5523_unregister_sysfs(struct i2c_client *client)
sysfs_remove_group(&dev->kobj, &lp5523_group);
- for (i = 0; i < ARRAY_SIZE(chip->engines); i++)
- if (chip->engines[i].mode == LP5523_CMD_LOAD)
- sysfs_remove_group(&dev->kobj, &lp5523_engine_group[i]);
-
for (i = 0; i < chip->num_leds; i++)
sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
&lp5523_led_attribute_group);
@@ -803,10 +791,6 @@ static void lp5523_unregister_sysfs(struct i2c_client *client)
/*--------------------------------------------------------------*/
static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
{
- /* engine to chip */
- struct lp5523_chip *chip = engine_to_lp5523(engine);
- struct i2c_client *client = chip->client;
- struct device *dev = &client->dev;
int ret = 0;
/* if in that mode already do nothing, except for run */
@@ -818,18 +802,10 @@ static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
} else if (mode == LP5523_CMD_LOAD) {
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
-
- ret = sysfs_create_group(&dev->kobj, engine->attributes);
- if (ret)
- return ret;
} else if (mode == LP5523_CMD_DISABLED) {
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
}
- /* remove load attribute from sysfs if not in load mode */
- if (engine->mode == LP5523_CMD_LOAD && mode != LP5523_CMD_LOAD)
- sysfs_remove_group(&dev->kobj, engine->attributes);
-
engine->mode = mode;
return ret;
@@ -846,7 +822,6 @@ static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
engine->prog_page = id - 1;
engine->mux_page = id + 2;
- engine->attributes = &lp5523_engine_group[id - 1];
return 0;
}
@@ -871,7 +846,8 @@ static int __init lp5523_init_led(struct lp5523_led *led, struct device *dev,
return -EINVAL;
}
- snprintf(name, 32, "lp5523:channel%d", chan);
+ snprintf(name, sizeof(name), "%s:channel%d",
+ pdata->label ?: "lp5523", chan);
led->cdev.name = name;
led->cdev.brightness_set = lp5523_set_brightness;
@@ -930,11 +906,16 @@ static int lp5523_probe(struct i2c_client *client,
if (pdata->enable) {
pdata->enable(0);
- usleep_range(1000, 10000);
+ usleep_range(1000, 2000); /* Keep enable down at least 1ms */
pdata->enable(1);
- usleep_range(1000, 10000); /* Spec says min 500us */
+ usleep_range(1000, 2000); /* 500us abs min. */
}
+ lp5523_write(client, LP5523_REG_RESET, 0xff);
+ usleep_range(10000, 20000); /*
+ * Exact value is not available. 10 - 20ms
+ * appears to be enough for reset.
+ */
ret = lp5523_detect(client);
if (ret)
goto fail2;
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-27 14:22:06 +0300