mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 21:21:41 +00:00
98d278ca00
If both LED banks aren't used in device tree, an out-of-bounds condition in lm3697_init occurs because of the for loop assuming that all the banks are used. Fix it by adding a variable that contains the number of used banks. Signed-off-by: Gabriel David <ultracoolguy@tutanota.com> [removed extra rename, minor tweaks] Signed-off-by: Pavel Machek <pavel@ucw.cz> Cc: stable@kernel.org
387 lines
9.4 KiB
C
387 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// TI LM3697 LED chip family driver
|
|
// Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
|
|
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/leds-ti-lmu-common.h>
|
|
|
|
#define LM3697_REV 0x0
|
|
#define LM3697_RESET 0x1
|
|
#define LM3697_OUTPUT_CONFIG 0x10
|
|
#define LM3697_CTRL_A_RAMP 0x11
|
|
#define LM3697_CTRL_B_RAMP 0x12
|
|
#define LM3697_CTRL_A_B_RT_RAMP 0x13
|
|
#define LM3697_CTRL_A_B_RAMP_CFG 0x14
|
|
#define LM3697_CTRL_A_B_BRT_CFG 0x16
|
|
#define LM3697_CTRL_A_FS_CURR_CFG 0x17
|
|
#define LM3697_CTRL_B_FS_CURR_CFG 0x18
|
|
#define LM3697_PWM_CFG 0x1c
|
|
#define LM3697_CTRL_A_BRT_LSB 0x20
|
|
#define LM3697_CTRL_A_BRT_MSB 0x21
|
|
#define LM3697_CTRL_B_BRT_LSB 0x22
|
|
#define LM3697_CTRL_B_BRT_MSB 0x23
|
|
#define LM3697_CTRL_ENABLE 0x24
|
|
|
|
#define LM3697_SW_RESET BIT(0)
|
|
|
|
#define LM3697_CTRL_A_EN BIT(0)
|
|
#define LM3697_CTRL_B_EN BIT(1)
|
|
#define LM3697_CTRL_A_B_EN (LM3697_CTRL_A_EN | LM3697_CTRL_B_EN)
|
|
|
|
#define LM3697_MAX_LED_STRINGS 3
|
|
|
|
#define LM3697_CONTROL_A 0
|
|
#define LM3697_CONTROL_B 1
|
|
#define LM3697_MAX_CONTROL_BANKS 2
|
|
|
|
/**
|
|
* struct lm3697_led -
|
|
* @hvled_strings: Array of LED strings associated with a control bank
|
|
* @label: LED label
|
|
* @led_dev: LED class device
|
|
* @priv: Pointer to the device struct
|
|
* @lmu_data: Register and setting values for common code
|
|
* @control_bank: Control bank the LED is associated to. 0 is control bank A
|
|
* 1 is control bank B
|
|
*/
|
|
struct lm3697_led {
|
|
u32 hvled_strings[LM3697_MAX_LED_STRINGS];
|
|
char label[LED_MAX_NAME_SIZE];
|
|
struct led_classdev led_dev;
|
|
struct lm3697 *priv;
|
|
struct ti_lmu_bank lmu_data;
|
|
int control_bank;
|
|
int enabled;
|
|
int num_leds;
|
|
};
|
|
|
|
/**
|
|
* struct lm3697 -
|
|
* @enable_gpio: Hardware enable gpio
|
|
* @regulator: LED supply regulator pointer
|
|
* @client: Pointer to the I2C client
|
|
* @regmap: Devices register map
|
|
* @dev: Pointer to the devices device struct
|
|
* @lock: Lock for reading/writing the device
|
|
* @leds: Array of LED strings
|
|
*/
|
|
struct lm3697 {
|
|
struct gpio_desc *enable_gpio;
|
|
struct regulator *regulator;
|
|
struct i2c_client *client;
|
|
struct regmap *regmap;
|
|
struct device *dev;
|
|
struct mutex lock;
|
|
|
|
int bank_cfg;
|
|
int num_banks;
|
|
|
|
struct lm3697_led leds[];
|
|
};
|
|
|
|
static const struct reg_default lm3697_reg_defs[] = {
|
|
{LM3697_OUTPUT_CONFIG, 0x6},
|
|
{LM3697_CTRL_A_RAMP, 0x0},
|
|
{LM3697_CTRL_B_RAMP, 0x0},
|
|
{LM3697_CTRL_A_B_RT_RAMP, 0x0},
|
|
{LM3697_CTRL_A_B_RAMP_CFG, 0x0},
|
|
{LM3697_CTRL_A_B_BRT_CFG, 0x0},
|
|
{LM3697_CTRL_A_FS_CURR_CFG, 0x13},
|
|
{LM3697_CTRL_B_FS_CURR_CFG, 0x13},
|
|
{LM3697_PWM_CFG, 0xc},
|
|
{LM3697_CTRL_A_BRT_LSB, 0x0},
|
|
{LM3697_CTRL_A_BRT_MSB, 0x0},
|
|
{LM3697_CTRL_B_BRT_LSB, 0x0},
|
|
{LM3697_CTRL_B_BRT_MSB, 0x0},
|
|
{LM3697_CTRL_ENABLE, 0x0},
|
|
};
|
|
|
|
static const struct regmap_config lm3697_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
|
|
.max_register = LM3697_CTRL_ENABLE,
|
|
.reg_defaults = lm3697_reg_defs,
|
|
.num_reg_defaults = ARRAY_SIZE(lm3697_reg_defs),
|
|
.cache_type = REGCACHE_FLAT,
|
|
};
|
|
|
|
static int lm3697_brightness_set(struct led_classdev *led_cdev,
|
|
enum led_brightness brt_val)
|
|
{
|
|
struct lm3697_led *led = container_of(led_cdev, struct lm3697_led,
|
|
led_dev);
|
|
int ctrl_en_val = (1 << led->control_bank);
|
|
struct device *dev = led->priv->dev;
|
|
int ret;
|
|
|
|
mutex_lock(&led->priv->lock);
|
|
|
|
if (brt_val == LED_OFF) {
|
|
ret = regmap_update_bits(led->priv->regmap, LM3697_CTRL_ENABLE,
|
|
ctrl_en_val, ~ctrl_en_val);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot write ctrl register\n");
|
|
goto brightness_out;
|
|
}
|
|
|
|
led->enabled = LED_OFF;
|
|
} else {
|
|
ret = ti_lmu_common_set_brightness(&led->lmu_data, brt_val);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot write brightness\n");
|
|
goto brightness_out;
|
|
}
|
|
|
|
if (!led->enabled) {
|
|
ret = regmap_update_bits(led->priv->regmap,
|
|
LM3697_CTRL_ENABLE,
|
|
ctrl_en_val, ctrl_en_val);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot enable the device\n");
|
|
goto brightness_out;
|
|
}
|
|
|
|
led->enabled = brt_val;
|
|
}
|
|
}
|
|
|
|
brightness_out:
|
|
mutex_unlock(&led->priv->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int lm3697_init(struct lm3697 *priv)
|
|
{
|
|
struct device *dev = priv->dev;
|
|
struct lm3697_led *led;
|
|
int i, ret;
|
|
|
|
if (priv->enable_gpio) {
|
|
gpiod_direction_output(priv->enable_gpio, 1);
|
|
} else {
|
|
ret = regmap_write(priv->regmap, LM3697_RESET, LM3697_SW_RESET);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot reset the device\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = regmap_write(priv->regmap, LM3697_CTRL_ENABLE, 0x0);
|
|
if (ret) {
|
|
dev_err(dev, "Cannot write ctrl enable\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = regmap_write(priv->regmap, LM3697_OUTPUT_CONFIG, priv->bank_cfg);
|
|
if (ret)
|
|
dev_err(dev, "Cannot write OUTPUT config\n");
|
|
|
|
for (i = 0; i < priv->num_banks; i++) {
|
|
led = &priv->leds[i];
|
|
ret = ti_lmu_common_set_ramp(&led->lmu_data);
|
|
if (ret)
|
|
dev_err(dev, "Setting the ramp rate failed\n");
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int lm3697_probe_dt(struct lm3697 *priv)
|
|
{
|
|
struct fwnode_handle *child = NULL;
|
|
struct device *dev = priv->dev;
|
|
struct lm3697_led *led;
|
|
int ret = -EINVAL;
|
|
int control_bank;
|
|
size_t i = 0;
|
|
int j;
|
|
|
|
priv->enable_gpio = devm_gpiod_get_optional(dev, "enable",
|
|
GPIOD_OUT_LOW);
|
|
if (IS_ERR(priv->enable_gpio)) {
|
|
ret = PTR_ERR(priv->enable_gpio);
|
|
dev_err(dev, "Failed to get enable gpio: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
priv->regulator = devm_regulator_get(dev, "vled");
|
|
if (IS_ERR(priv->regulator))
|
|
priv->regulator = NULL;
|
|
|
|
device_for_each_child_node(dev, child) {
|
|
struct led_init_data init_data = {};
|
|
|
|
ret = fwnode_property_read_u32(child, "reg", &control_bank);
|
|
if (ret) {
|
|
dev_err(dev, "reg property missing\n");
|
|
fwnode_handle_put(child);
|
|
goto child_out;
|
|
}
|
|
|
|
if (control_bank > LM3697_CONTROL_B) {
|
|
dev_err(dev, "reg property is invalid\n");
|
|
ret = -EINVAL;
|
|
fwnode_handle_put(child);
|
|
goto child_out;
|
|
}
|
|
|
|
led = &priv->leds[i];
|
|
|
|
ret = ti_lmu_common_get_brt_res(dev, child, &led->lmu_data);
|
|
if (ret)
|
|
dev_warn(dev,
|
|
"brightness resolution property missing\n");
|
|
|
|
led->control_bank = control_bank;
|
|
led->lmu_data.regmap = priv->regmap;
|
|
led->lmu_data.runtime_ramp_reg = LM3697_CTRL_A_RAMP +
|
|
control_bank;
|
|
led->lmu_data.msb_brightness_reg = LM3697_CTRL_A_BRT_MSB +
|
|
led->control_bank * 2;
|
|
led->lmu_data.lsb_brightness_reg = LM3697_CTRL_A_BRT_LSB +
|
|
led->control_bank * 2;
|
|
|
|
led->num_leds = fwnode_property_count_u32(child, "led-sources");
|
|
if (led->num_leds > LM3697_MAX_LED_STRINGS) {
|
|
dev_err(dev, "Too many LED strings defined\n");
|
|
continue;
|
|
}
|
|
|
|
ret = fwnode_property_read_u32_array(child, "led-sources",
|
|
led->hvled_strings,
|
|
led->num_leds);
|
|
if (ret) {
|
|
dev_err(dev, "led-sources property missing\n");
|
|
fwnode_handle_put(child);
|
|
goto child_out;
|
|
}
|
|
|
|
for (j = 0; j < led->num_leds; j++)
|
|
priv->bank_cfg |=
|
|
(led->control_bank << led->hvled_strings[j]);
|
|
|
|
ret = ti_lmu_common_get_ramp_params(dev, child, &led->lmu_data);
|
|
if (ret)
|
|
dev_warn(dev, "runtime-ramp properties missing\n");
|
|
|
|
init_data.fwnode = child;
|
|
init_data.devicename = priv->client->name;
|
|
/* for backwards compatibility if `label` is not present */
|
|
init_data.default_label = ":";
|
|
|
|
led->priv = priv;
|
|
led->led_dev.max_brightness = led->lmu_data.max_brightness;
|
|
led->led_dev.brightness_set_blocking = lm3697_brightness_set;
|
|
|
|
ret = devm_led_classdev_register_ext(dev, &led->led_dev,
|
|
&init_data);
|
|
if (ret) {
|
|
dev_err(dev, "led register err: %d\n", ret);
|
|
fwnode_handle_put(child);
|
|
goto child_out;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
|
|
child_out:
|
|
return ret;
|
|
}
|
|
|
|
static int lm3697_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct lm3697 *led;
|
|
int count;
|
|
int ret;
|
|
|
|
count = device_get_child_node_count(dev);
|
|
if (!count || count > LM3697_MAX_CONTROL_BANKS) {
|
|
dev_err(dev, "Strange device tree!");
|
|
return -ENODEV;
|
|
}
|
|
|
|
led = devm_kzalloc(dev, struct_size(led, leds, count), GFP_KERNEL);
|
|
if (!led)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&led->lock);
|
|
i2c_set_clientdata(client, led);
|
|
|
|
led->client = client;
|
|
led->dev = dev;
|
|
led->num_banks = count;
|
|
led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
|
|
if (IS_ERR(led->regmap)) {
|
|
ret = PTR_ERR(led->regmap);
|
|
dev_err(dev, "Failed to allocate register map: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = lm3697_probe_dt(led);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return lm3697_init(led);
|
|
}
|
|
|
|
static int lm3697_remove(struct i2c_client *client)
|
|
{
|
|
struct lm3697 *led = i2c_get_clientdata(client);
|
|
struct device *dev = &led->client->dev;
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(led->regmap, LM3697_CTRL_ENABLE,
|
|
LM3697_CTRL_A_B_EN, 0);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to disable the device\n");
|
|
return ret;
|
|
}
|
|
|
|
if (led->enable_gpio)
|
|
gpiod_direction_output(led->enable_gpio, 0);
|
|
|
|
if (led->regulator) {
|
|
ret = regulator_disable(led->regulator);
|
|
if (ret)
|
|
dev_err(dev, "Failed to disable regulator\n");
|
|
}
|
|
|
|
mutex_destroy(&led->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id lm3697_id[] = {
|
|
{ "lm3697", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm3697_id);
|
|
|
|
static const struct of_device_id of_lm3697_leds_match[] = {
|
|
{ .compatible = "ti,lm3697", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_lm3697_leds_match);
|
|
|
|
static struct i2c_driver lm3697_driver = {
|
|
.driver = {
|
|
.name = "lm3697",
|
|
.of_match_table = of_lm3697_leds_match,
|
|
},
|
|
.probe = lm3697_probe,
|
|
.remove = lm3697_remove,
|
|
.id_table = lm3697_id,
|
|
};
|
|
module_i2c_driver(lm3697_driver);
|
|
|
|
MODULE_DESCRIPTION("Texas Instruments LM3697 LED driver");
|
|
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|