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path: root/drivers/leds/leds-lm3692x.c
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Diffstat (limited to 'drivers/leds/leds-lm3692x.c')
-rw-r--r--drivers/leds/leds-lm3692x.c181
1 files changed, 128 insertions, 53 deletions
diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
index 437173d1712c..4f413a7c5f05 100644
--- a/drivers/leds/leds-lm3692x.c
+++ b/drivers/leds/leds-lm3692x.c
@@ -1,17 +1,6 @@
-/*
- * TI lm3692x LED Driver
- *
- * Copyright (C) 2017 Texas Instruments
- *
- * Author: Dan Murphy <dmurphy@ti.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
- *
- * Data sheet is located
- * http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf
- */
+// SPDX-License-Identifier: GPL-2.0
+// TI LM3692x LED chip family driver
+// Copyright (C) 2017-18 Texas Instruments Incorporated - http://www.ti.com/
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
@@ -26,6 +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
@@ -44,6 +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)
@@ -109,6 +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;
@@ -118,6 +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[] = {
@@ -200,6 +199,7 @@ out:
static int lm3692x_init(struct lm3692x_led *led)
{
+ int enable_state;
int ret;
if (led->regulator) {
@@ -226,9 +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)
@@ -258,6 +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");
@@ -274,52 +322,75 @@ 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)
{
- int ret;
- struct lm3692x_led *led;
- struct device_node *np = client->dev.of_node;
- struct device_node *child_node;
+ struct fwnode_handle *child = NULL;
const char *name;
+ int ret;
- led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
- if (!led)
- return -ENOMEM;
-
- for_each_available_child_of_node(np, child_node) {
- led->led_dev.default_trigger = of_get_property(child_node,
- "linux,default-trigger",
- NULL);
-
- ret = of_property_read_string(child_node, "label", &name);
- if (!ret)
- snprintf(led->label, sizeof(led->label),
- "%s:%s", id->name, name);
- else
- snprintf(led->label, sizeof(led->label),
- "%s::backlight_cluster", id->name);
- };
-
- 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;
+ child = device_get_next_child_node(&led->client->dev, child);
+ if (!child) {
+ dev_err(&led->client->dev, "No LED Child node\n");
+ return -ENODEV;
+ }
+
+ fwnode_property_read_string(child, "linux,default-trigger",
+ &led->led_dev.default_trigger);
+
+ ret = fwnode_property_read_string(child, "label", &name);
+ if (ret)
+ snprintf(led->label, sizeof(led->label),
+ "%s::", led->client->name);
+ else
+ snprintf(led->label, sizeof(led->label),
+ "%s:%s", led->client->name, name);
+
+ 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;
- led->led_dev.brightness_set_blocking = lm3692x_brightness_set;
- mutex_init(&led->lock);
+ ret = devm_led_classdev_register(&led->client->dev, &led->led_dev);
+ if (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);
@@ -330,15 +401,13 @@ static int lm3692x_probe(struct i2c_client *client,
return ret;
}
- ret = lm3692x_init(led);
+ ret = lm3692x_probe_dt(led);
if (ret)
return ret;
- ret = devm_led_classdev_register(&client->dev, &led->led_dev);
- if (ret) {
- dev_err(&client->dev, "led register err: %d\n", ret);
+ ret = lm3692x_init(led);
+ if (ret)
return ret;
- }
return 0;
}
@@ -348,6 +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);
@@ -364,8 +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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-19 08:07:58 +0000