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authorDan Murphy <dmurphy@ti.com>2018-07-02 18:12:16 (GMT)
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2018-07-03 20:27:12 (GMT)
commit07abd4325e7013c728bf9642fbb862aa9eb4a367 (patch)
tree935540b6c4c9882d58a450d4168eb5b6f80766c8 /drivers/leds
parent581e3ca38a1aa40b742baad39026f440445488d4 (diff)
leds: lm3692x: Support LED sync configuration
The LM36922 has one output but can sync current to 2 LED strings. The user may only use one sync so the other syncs need to be disabled. The LM36923 has 3 LED syncs. Signed-off-by: Dan Murphy <dmurphy@ti.com> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-lm3692x.c158
1 files changed, 120 insertions, 38 deletions
diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
index 9e6432b..4f413a7 100644
--- a/drivers/leds/leds-lm3692x.c
+++ b/drivers/leds/leds-lm3692x.c
@@ -15,6 +15,9 @@
#include <linux/slab.h>
#include <uapi/linux/uleds.h>
+#define LM36922_MODEL 0
+#define LM36923_MODEL 1
+
#define LM3692X_REV 0x0
#define LM3692X_RESET 0x1
#define LM3692X_EN 0x10
@@ -33,6 +36,9 @@
#define LM3692X_DEVICE_EN BIT(0)
#define LM3692X_LED1_EN BIT(1)
#define LM3692X_LED2_EN BIT(2)
+#define LM36923_LED3_EN BIT(3)
+#define LM3692X_ENABLE_MASK (LM3692X_DEVICE_EN | LM3692X_LED1_EN | \
+ LM3692X_LED2_EN | LM36923_LED3_EN)
/* Brightness Control Bits */
#define LM3692X_BL_ADJ_POL BIT(0)
@@ -98,6 +104,8 @@
* @enable_gpio - VDDIO/EN gpio to enable communication interface
* @regulator - LED supply regulator pointer
* @label - LED label
+ * @led_enable - LED sync to be enabled
+ * @model_id - Current device model ID enumerated
*/
struct lm3692x_led {
struct mutex lock;
@@ -107,6 +115,8 @@ struct lm3692x_led {
struct gpio_desc *enable_gpio;
struct regulator *regulator;
char label[LED_MAX_NAME_SIZE];
+ int led_enable;
+ int model_id;
};
static const struct reg_default lm3692x_reg_defs[] = {
@@ -189,6 +199,7 @@ out:
static int lm3692x_init(struct lm3692x_led *led)
{
+ int enable_state;
int ret;
if (led->regulator) {
@@ -215,9 +226,25 @@ static int lm3692x_init(struct lm3692x_led *led)
/*
* For glitch free operation, the following data should
- * only be written while device enable bit is 0
+ * only be written while LEDx enable bits are 0 and the device enable
+ * bit is set to 1.
* per Section 7.5.14 of the data sheet
*/
+ ret = regmap_write(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN);
+ if (ret)
+ goto out;
+
+ /* Set the brightness to 0 so when enabled the LEDs do not come
+ * on with full brightness.
+ */
+ ret = regmap_write(led->regmap, LM3692X_BRT_MSB, 0);
+ if (ret)
+ goto out;
+
+ ret = regmap_write(led->regmap, LM3692X_BRT_LSB, 0);
+ if (ret)
+ goto out;
+
ret = regmap_write(led->regmap, LM3692X_PWM_CTRL,
LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ);
if (ret)
@@ -247,6 +274,38 @@ static int lm3692x_init(struct lm3692x_led *led)
if (ret)
goto out;
+ switch (led->led_enable) {
+ case 0:
+ default:
+ if (led->model_id == LM36923_MODEL)
+ enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN |
+ LM36923_LED3_EN;
+ else
+ enable_state = LM3692X_LED1_EN | LM3692X_LED2_EN;
+
+ break;
+ case 1:
+ enable_state = LM3692X_LED1_EN;
+ break;
+ case 2:
+ enable_state = LM3692X_LED2_EN;
+ break;
+
+ case 3:
+ if (led->model_id == LM36923_MODEL) {
+ enable_state = LM36923_LED3_EN;
+ break;
+ }
+
+ ret = -EINVAL;
+ dev_err(&led->client->dev,
+ "LED3 sync not available on this device\n");
+ goto out;
+ }
+
+ ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK,
+ enable_state | LM3692X_DEVICE_EN);
+
return ret;
out:
dev_err(&led->client->dev, "Fail writing initialization values\n");
@@ -263,55 +322,29 @@ out:
return ret;
}
-
-static int lm3692x_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int lm3692x_probe_dt(struct lm3692x_led *led)
{
struct fwnode_handle *child = NULL;
- struct lm3692x_led *led;
const char *name;
int ret;
- led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
- if (!led)
- return -ENOMEM;
-
- led->enable_gpio = devm_gpiod_get_optional(&client->dev,
+ led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
"enable", GPIOD_OUT_LOW);
if (IS_ERR(led->enable_gpio)) {
ret = PTR_ERR(led->enable_gpio);
- dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);
+ dev_err(&led->client->dev, "Failed to get enable gpio: %d\n",
+ ret);
return ret;
}
- led->regulator = devm_regulator_get(&client->dev, "vled");
+ led->regulator = devm_regulator_get(&led->client->dev, "vled");
if (IS_ERR(led->regulator))
led->regulator = NULL;
- led->client = client;
- led->led_dev.name = led->label;
- led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
-
- mutex_init(&led->lock);
-
- i2c_set_clientdata(client, led);
-
- led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
- if (IS_ERR(led->regmap)) {
- ret = PTR_ERR(led->regmap);
- dev_err(&client->dev, "Failed to allocate register map: %d\n",
- ret);
- return ret;
- }
-
- ret = lm3692x_init(led);
- if (ret)
- return ret;
-
child = device_get_next_child_node(&led->client->dev, child);
if (!child) {
dev_err(&led->client->dev, "No LED Child node\n");
- return ret;
+ return -ENODEV;
}
fwnode_property_read_string(child, "linux,default-trigger",
@@ -325,14 +358,57 @@ static int lm3692x_probe(struct i2c_client *client,
snprintf(led->label, sizeof(led->label),
"%s:%s", led->client->name, name);
- led->led_dev.dev->of_node = to_of_node(child);
+ ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
+ if (ret) {
+ dev_err(&led->client->dev, "reg DT property missing\n");
+ return ret;
+ }
+
+ led->led_dev.name = led->label;
- ret = devm_led_classdev_register(&client->dev, &led->led_dev);
+ ret = devm_led_classdev_register(&led->client->dev, &led->led_dev);
if (ret) {
- dev_err(&client->dev, "led register err: %d\n", ret);
+ dev_err(&led->client->dev, "led register err: %d\n", ret);
+ return ret;
+ }
+
+ led->led_dev.dev->of_node = to_of_node(child);
+
+ return 0;
+}
+
+static int lm3692x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lm3692x_led *led;
+ int ret;
+
+ led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ mutex_init(&led->lock);
+ led->client = client;
+ led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
+ led->model_id = id->driver_data;
+ i2c_set_clientdata(client, led);
+
+ led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config);
+ if (IS_ERR(led->regmap)) {
+ ret = PTR_ERR(led->regmap);
+ dev_err(&client->dev, "Failed to allocate register map: %d\n",
+ ret);
return ret;
}
+ ret = lm3692x_probe_dt(led);
+ if (ret)
+ return ret;
+
+ ret = lm3692x_init(led);
+ if (ret)
+ return ret;
+
return 0;
}
@@ -341,6 +417,12 @@ static int lm3692x_remove(struct i2c_client *client)
struct lm3692x_led *led = i2c_get_clientdata(client);
int ret;
+ ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0);
+ if (ret) {
+ dev_err(&led->client->dev, "Failed to disable regulator\n");
+ return ret;
+ }
+
if (led->enable_gpio)
gpiod_direction_output(led->enable_gpio, 0);
@@ -357,8 +439,8 @@ static int lm3692x_remove(struct i2c_client *client)
}
static const struct i2c_device_id lm3692x_id[] = {
- { "lm36922", 0 },
- { "lm36923", 1 },
+ { "lm36922", LM36922_MODEL },
+ { "lm36923", LM36923_MODEL },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm3692x_id);

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