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linux-stable/drivers/leds/leds-lp50xx.c
Andy Shevchenko f1e1d532da leds: lp50xx: Put fwnode in error case during ->probe() 
fwnode_for_each_child_node() bumps a reference counting of a returned variable.
We have to balance it whenever we return to the caller.

OTOH, the successful iteration will drop reference count under the hood, no need
to do it twice.

Fixes: 242b81170f ("leds: lp50xx: Add the LP50XX family of the RGB LED driver")
Cc: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2021-05-28 12:00:15 +02:00

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// SPDX-License-Identifier: GPL-2.0
// TI LP50XX LED chip family driver
// Copyright (C) 2018-20 Texas Instruments Incorporated - https://www.ti.com/
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <uapi/linux/uleds.h>
#include <linux/led-class-multicolor.h>
#include "leds.h"
#define LP50XX_DEV_CFG0 0x00
#define LP50XX_DEV_CFG1 0x01
#define LP50XX_LED_CFG0 0x02
/* LP5009 and LP5012 registers */
#define LP5012_BNK_BRT 0x03
#define LP5012_BNKA_CLR 0x04
#define LP5012_BNKB_CLR 0x05
#define LP5012_BNKC_CLR 0x06
#define LP5012_LED0_BRT 0x07
#define LP5012_OUT0_CLR 0x0b
#define LP5012_RESET 0x17
/* LP5018 and LP5024 registers */
#define LP5024_BNK_BRT 0x03
#define LP5024_BNKA_CLR 0x04
#define LP5024_BNKB_CLR 0x05
#define LP5024_BNKC_CLR 0x06
#define LP5024_LED0_BRT 0x07
#define LP5024_OUT0_CLR 0x0f
#define LP5024_RESET 0x27
/* LP5030 and LP5036 registers */
#define LP5036_LED_CFG1 0x03
#define LP5036_BNK_BRT 0x04
#define LP5036_BNKA_CLR 0x05
#define LP5036_BNKB_CLR 0x06
#define LP5036_BNKC_CLR 0x07
#define LP5036_LED0_BRT 0x08
#define LP5036_OUT0_CLR 0x14
#define LP5036_RESET 0x38
#define LP50XX_SW_RESET 0xff
#define LP50XX_CHIP_EN BIT(6)
/* There are 3 LED outputs per bank */
#define LP50XX_LEDS_PER_MODULE 3
#define LP5009_MAX_LED_MODULES 2
#define LP5012_MAX_LED_MODULES 4
#define LP5018_MAX_LED_MODULES 6
#define LP5024_MAX_LED_MODULES 8
#define LP5030_MAX_LED_MODULES 10
#define LP5036_MAX_LED_MODULES 12
static const struct reg_default lp5012_reg_defs[] = {
{LP50XX_DEV_CFG0, 0x0},
{LP50XX_DEV_CFG1, 0x3c},
{LP50XX_LED_CFG0, 0x0},
{LP5012_BNK_BRT, 0xff},
{LP5012_BNKA_CLR, 0x0f},
{LP5012_BNKB_CLR, 0x0f},
{LP5012_BNKC_CLR, 0x0f},
{LP5012_LED0_BRT, 0x0f},
/* LEDX_BRT registers are all 0xff for defaults */
{0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff},
{LP5012_OUT0_CLR, 0x0f},
/* OUTX_CLR registers are all 0x0 for defaults */
{0x0c, 0x00}, {0x0d, 0x00}, {0x0e, 0x00}, {0x0f, 0x00}, {0x10, 0x00},
{0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00}, {0x14, 0x00}, {0x15, 0x00},
{0x16, 0x00},
{LP5012_RESET, 0x00}
};
static const struct reg_default lp5024_reg_defs[] = {
{LP50XX_DEV_CFG0, 0x0},
{LP50XX_DEV_CFG1, 0x3c},
{LP50XX_LED_CFG0, 0x0},
{LP5024_BNK_BRT, 0xff},
{LP5024_BNKA_CLR, 0x0f},
{LP5024_BNKB_CLR, 0x0f},
{LP5024_BNKC_CLR, 0x0f},
{LP5024_LED0_BRT, 0x0f},
/* LEDX_BRT registers are all 0xff for defaults */
{0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff}, {0x0b, 0xff}, {0x0c, 0xff},
{0x0d, 0xff}, {0x0e, 0xff},
{LP5024_OUT0_CLR, 0x0f},
/* OUTX_CLR registers are all 0x0 for defaults */
{0x10, 0x00}, {0x11, 0x00}, {0x12, 0x00}, {0x13, 0x00}, {0x14, 0x00},
{0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00}, {0x18, 0x00}, {0x19, 0x00},
{0x1a, 0x00}, {0x1b, 0x00}, {0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00},
{0x1f, 0x00}, {0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00},
{0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00},
{LP5024_RESET, 0x00}
};
static const struct reg_default lp5036_reg_defs[] = {
{LP50XX_DEV_CFG0, 0x0},
{LP50XX_DEV_CFG1, 0x3c},
{LP50XX_LED_CFG0, 0x0},
{LP5036_LED_CFG1, 0x0},
{LP5036_BNK_BRT, 0xff},
{LP5036_BNKA_CLR, 0x0f},
{LP5036_BNKB_CLR, 0x0f},
{LP5036_BNKC_CLR, 0x0f},
{LP5036_LED0_BRT, 0x0f},
/* LEDX_BRT registers are all 0xff for defaults */
{0x08, 0xff}, {0x09, 0xff}, {0x0a, 0xff}, {0x0b, 0xff}, {0x0c, 0xff},
{0x0d, 0xff}, {0x0e, 0xff}, {0x0f, 0xff}, {0x10, 0xff}, {0x11, 0xff},
{0x12, 0xff}, {0x13, 0xff},
{LP5036_OUT0_CLR, 0x0f},
/* OUTX_CLR registers are all 0x0 for defaults */
{0x15, 0x00}, {0x16, 0x00}, {0x17, 0x00}, {0x18, 0x00}, {0x19, 0x00},
{0x1a, 0x00}, {0x1b, 0x00}, {0x1c, 0x00}, {0x1d, 0x00}, {0x1e, 0x00},
{0x1f, 0x00}, {0x20, 0x00}, {0x21, 0x00}, {0x22, 0x00}, {0x23, 0x00},
{0x24, 0x00}, {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
{0x29, 0x00}, {0x2a, 0x00}, {0x2b, 0x00}, {0x2c, 0x00}, {0x2d, 0x00},
{0x2e, 0x00}, {0x2f, 0x00}, {0x30, 0x00}, {0x31, 0x00}, {0x32, 0x00},
{0x33, 0x00}, {0x34, 0x00}, {0x35, 0x00}, {0x36, 0x00}, {0x37, 0x00},
{LP5036_RESET, 0x00}
};
static const struct regmap_config lp5012_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP5012_RESET,
.reg_defaults = lp5012_reg_defs,
.num_reg_defaults = ARRAY_SIZE(lp5012_reg_defs),
.cache_type = REGCACHE_FLAT,
};
static const struct regmap_config lp5024_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP5024_RESET,
.reg_defaults = lp5024_reg_defs,
.num_reg_defaults = ARRAY_SIZE(lp5024_reg_defs),
.cache_type = REGCACHE_FLAT,
};
static const struct regmap_config lp5036_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LP5036_RESET,
.reg_defaults = lp5036_reg_defs,
.num_reg_defaults = ARRAY_SIZE(lp5036_reg_defs),
.cache_type = REGCACHE_FLAT,
};
enum lp50xx_model {
LP5009,
LP5012,
LP5018,
LP5024,
LP5030,
LP5036,
};
/**
* struct lp50xx_chip_info -
* @lp50xx_regmap_config: regmap register configuration
* @model_id: LED device model
* @max_modules: total number of supported LED modules
* @num_leds: number of LED outputs available on the device
* @led_brightness0_reg: first brightness register of the device
* @mix_out0_reg: first color mix register of the device
* @bank_brt_reg: bank brightness register
* @bank_mix_reg: color mix register
* @reset_reg: device reset register
*/
struct lp50xx_chip_info {
const struct regmap_config *lp50xx_regmap_config;
int model_id;
u8 max_modules;
u8 num_leds;
u8 led_brightness0_reg;
u8 mix_out0_reg;
u8 bank_brt_reg;
u8 bank_mix_reg;
u8 reset_reg;
};
static const struct lp50xx_chip_info lp50xx_chip_info_tbl[] = {
[LP5009] = {
.model_id = LP5009,
.max_modules = LP5009_MAX_LED_MODULES,
.num_leds = LP5009_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5012_LED0_BRT,
.mix_out0_reg = LP5012_OUT0_CLR,
.bank_brt_reg = LP5012_BNK_BRT,
.bank_mix_reg = LP5012_BNKA_CLR,
.reset_reg = LP5012_RESET,
.lp50xx_regmap_config = &lp5012_regmap_config,
},
[LP5012] = {
.model_id = LP5012,
.max_modules = LP5012_MAX_LED_MODULES,
.num_leds = LP5012_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5012_LED0_BRT,
.mix_out0_reg = LP5012_OUT0_CLR,
.bank_brt_reg = LP5012_BNK_BRT,
.bank_mix_reg = LP5012_BNKA_CLR,
.reset_reg = LP5012_RESET,
.lp50xx_regmap_config = &lp5012_regmap_config,
},
[LP5018] = {
.model_id = LP5018,
.max_modules = LP5018_MAX_LED_MODULES,
.num_leds = LP5018_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5024_LED0_BRT,
.mix_out0_reg = LP5024_OUT0_CLR,
.bank_brt_reg = LP5024_BNK_BRT,
.bank_mix_reg = LP5024_BNKA_CLR,
.reset_reg = LP5024_RESET,
.lp50xx_regmap_config = &lp5024_regmap_config,
},
[LP5024] = {
.model_id = LP5024,
.max_modules = LP5024_MAX_LED_MODULES,
.num_leds = LP5024_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5024_LED0_BRT,
.mix_out0_reg = LP5024_OUT0_CLR,
.bank_brt_reg = LP5024_BNK_BRT,
.bank_mix_reg = LP5024_BNKA_CLR,
.reset_reg = LP5024_RESET,
.lp50xx_regmap_config = &lp5024_regmap_config,
},
[LP5030] = {
.model_id = LP5030,
.max_modules = LP5030_MAX_LED_MODULES,
.num_leds = LP5030_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5036_LED0_BRT,
.mix_out0_reg = LP5036_OUT0_CLR,
.bank_brt_reg = LP5036_BNK_BRT,
.bank_mix_reg = LP5036_BNKA_CLR,
.reset_reg = LP5036_RESET,
.lp50xx_regmap_config = &lp5036_regmap_config,
},
[LP5036] = {
.model_id = LP5036,
.max_modules = LP5036_MAX_LED_MODULES,
.num_leds = LP5036_MAX_LED_MODULES * LP50XX_LEDS_PER_MODULE,
.led_brightness0_reg = LP5036_LED0_BRT,
.mix_out0_reg = LP5036_OUT0_CLR,
.bank_brt_reg = LP5036_BNK_BRT,
.bank_mix_reg = LP5036_BNKA_CLR,
.reset_reg = LP5036_RESET,
.lp50xx_regmap_config = &lp5036_regmap_config,
},
};
struct lp50xx_led {
struct led_classdev_mc mc_cdev;
struct lp50xx *priv;
unsigned long bank_modules;
int led_intensity[LP50XX_LEDS_PER_MODULE];
u8 ctrl_bank_enabled;
int led_number;
};
/**
* struct lp50xx -
* @enable_gpio: hardware enable gpio
* @regulator: LED supply regulator pointer
* @client: pointer to the I2C client
* @regmap: device register map
* @dev: pointer to the devices device struct
* @lock: lock for reading/writing the device
* @chip_info: chip specific information (ie num_leds)
* @num_of_banked_leds: holds the number of banked LEDs
* @leds: array of LED strings
*/
struct lp50xx {
struct gpio_desc *enable_gpio;
struct regulator *regulator;
struct i2c_client *client;
struct regmap *regmap;
struct device *dev;
struct mutex lock;
const struct lp50xx_chip_info *chip_info;
int num_of_banked_leds;
/* This needs to be at the end of the struct */
struct lp50xx_led leds[];
};
static struct lp50xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
{
return container_of(mc_cdev, struct lp50xx_led, mc_cdev);
}
static int lp50xx_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev);
struct lp50xx_led *led = mcled_cdev_to_led(mc_dev);
const struct lp50xx_chip_info *led_chip = led->priv->chip_info;
u8 led_offset, reg_val;
int ret = 0;
int i;
mutex_lock(&led->priv->lock);
if (led->ctrl_bank_enabled)
reg_val = led_chip->bank_brt_reg;
else
reg_val = led_chip->led_brightness0_reg +
led->led_number;
ret = regmap_write(led->priv->regmap, reg_val, brightness);
if (ret) {
dev_err(led->priv->dev,
"Cannot write brightness value %d\n", ret);
goto out;
}
for (i = 0; i < led->mc_cdev.num_colors; i++) {
if (led->ctrl_bank_enabled) {
reg_val = led_chip->bank_mix_reg + i;
} else {
led_offset = (led->led_number * 3) + i;
reg_val = led_chip->mix_out0_reg + led_offset;
}
ret = regmap_write(led->priv->regmap, reg_val,
mc_dev->subled_info[i].intensity);
if (ret) {
dev_err(led->priv->dev,
"Cannot write intensity value %d\n", ret);
goto out;
}
}
out:
mutex_unlock(&led->priv->lock);
return ret;
}
static int lp50xx_set_banks(struct lp50xx *priv, u32 led_banks[])
{
u8 led_config_lo, led_config_hi;
u32 bank_enable_mask = 0;
int ret;
int i;
for (i = 0; i < priv->chip_info->max_modules; i++) {
if (led_banks[i])
bank_enable_mask |= (1 << led_banks[i]);
}
led_config_lo = bank_enable_mask;
led_config_hi = bank_enable_mask >> 8;
ret = regmap_write(priv->regmap, LP50XX_LED_CFG0, led_config_lo);
if (ret)
return ret;
if (priv->chip_info->model_id >= LP5030)
ret = regmap_write(priv->regmap, LP5036_LED_CFG1, led_config_hi);
return ret;
}
static int lp50xx_reset(struct lp50xx *priv)
{
return regmap_write(priv->regmap, priv->chip_info->reset_reg, LP50XX_SW_RESET);
}
static int lp50xx_enable_disable(struct lp50xx *priv, int enable_disable)
{
int ret;
ret = gpiod_direction_output(priv->enable_gpio, enable_disable);
if (ret)
return ret;
if (enable_disable)
return regmap_write(priv->regmap, LP50XX_DEV_CFG0, LP50XX_CHIP_EN);
else
return regmap_write(priv->regmap, LP50XX_DEV_CFG0, 0);
}
static int lp50xx_probe_leds(struct fwnode_handle *child, struct lp50xx *priv,
struct lp50xx_led *led, int num_leds)
{
u32 led_banks[LP5036_MAX_LED_MODULES] = {0};
int led_number;
int ret;
if (num_leds > 1) {
if (num_leds > priv->chip_info->max_modules) {
dev_err(priv->dev, "reg property is invalid\n");
return -EINVAL;
}
priv->num_of_banked_leds = num_leds;
ret = fwnode_property_read_u32_array(child, "reg", led_banks, num_leds);
if (ret) {
dev_err(priv->dev, "reg property is missing\n");
return ret;
}
ret = lp50xx_set_banks(priv, led_banks);
if (ret) {
dev_err(priv->dev, "Cannot setup banked LEDs\n");
return ret;
}
led->ctrl_bank_enabled = 1;
} else {
ret = fwnode_property_read_u32(child, "reg", &led_number);
if (ret) {
dev_err(priv->dev, "led reg property missing\n");
return ret;
}
if (led_number > priv->chip_info->num_leds) {
dev_err(priv->dev, "led-sources property is invalid\n");
return -EINVAL;
}
led->led_number = led_number;
}
return 0;
}
static int lp50xx_probe_dt(struct lp50xx *priv)
{
struct fwnode_handle *child = NULL;
struct fwnode_handle *led_node = NULL;
struct led_init_data init_data = {};
struct led_classdev *led_cdev;
struct mc_subled *mc_led_info;
struct lp50xx_led *led;
int ret = -EINVAL;
int num_colors;
u32 color_id;
int i = 0;
priv->enable_gpio = devm_gpiod_get_optional(priv->dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(priv->enable_gpio))
return dev_err_probe(priv->dev, PTR_ERR(priv->enable_gpio),
"Failed to get enable GPIO\n");
priv->regulator = devm_regulator_get(priv->dev, "vled");
if (IS_ERR(priv->regulator))
priv->regulator = NULL;
device_for_each_child_node(priv->dev, child) {
led = &priv->leds[i];
ret = fwnode_property_count_u32(child, "reg");
if (ret < 0) {
dev_err(priv->dev, "reg property is invalid\n");
goto child_out;
}
ret = lp50xx_probe_leds(child, priv, led, ret);
if (ret)
goto child_out;
init_data.fwnode = child;
num_colors = 0;
/*
* There are only 3 LEDs per module otherwise they should be
* banked which also is presented as 3 LEDs.
*/
mc_led_info = devm_kcalloc(priv->dev, LP50XX_LEDS_PER_MODULE,
sizeof(*mc_led_info), GFP_KERNEL);
if (!mc_led_info) {
ret = -ENOMEM;
goto child_out;
}
fwnode_for_each_child_node(child, led_node) {
ret = fwnode_property_read_u32(led_node, "color",
&color_id);
if (ret) {
fwnode_handle_put(led_node);
dev_err(priv->dev, "Cannot read color\n");
goto child_out;
}
mc_led_info[num_colors].color_index = color_id;
num_colors++;
}
led->priv = priv;
led->mc_cdev.num_colors = num_colors;
led->mc_cdev.subled_info = mc_led_info;
led_cdev = &led->mc_cdev.led_cdev;
led_cdev->brightness_set_blocking = lp50xx_brightness_set;
ret = devm_led_classdev_multicolor_register_ext(priv->dev,
&led->mc_cdev,
&init_data);
if (ret) {
dev_err(priv->dev, "led register err: %d\n", ret);
goto child_out;
}
i++;
}
return 0;
child_out:
fwnode_handle_put(child);
return ret;
}
static int lp50xx_probe(struct i2c_client *client)
{
struct lp50xx *led;
int count;
int ret;
count = device_get_child_node_count(&client->dev);
if (!count) {
dev_err(&client->dev, "LEDs are not defined in device tree!");
return -ENODEV;
}
led = devm_kzalloc(&client->dev, struct_size(led, leds, count),
GFP_KERNEL);
if (!led)
return -ENOMEM;
mutex_init(&led->lock);
led->client = client;
led->dev = &client->dev;
led->chip_info = device_get_match_data(&client->dev);
i2c_set_clientdata(client, led);
led->regmap = devm_regmap_init_i2c(client,
led->chip_info->lp50xx_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 = lp50xx_reset(led);
if (ret)
return ret;
ret = lp50xx_enable_disable(led, 1);
if (ret)
return ret;
return lp50xx_probe_dt(led);
}
static int lp50xx_remove(struct i2c_client *client)
{
struct lp50xx *led = i2c_get_clientdata(client);
int ret;
ret = lp50xx_enable_disable(led, 0);
if (ret) {
dev_err(led->dev, "Failed to disable chip\n");
return ret;
}
if (led->regulator) {
ret = regulator_disable(led->regulator);
if (ret)
dev_err(led->dev, "Failed to disable regulator\n");
}
mutex_destroy(&led->lock);
return 0;
}
static const struct i2c_device_id lp50xx_id[] = {
{ "lp5009", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5009] },
{ "lp5012", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5012] },
{ "lp5018", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5018] },
{ "lp5024", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5024] },
{ "lp5030", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5030] },
{ "lp5036", (kernel_ulong_t)&lp50xx_chip_info_tbl[LP5036] },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp50xx_id);
static const struct of_device_id of_lp50xx_leds_match[] = {
{ .compatible = "ti,lp5009", .data = &lp50xx_chip_info_tbl[LP5009] },
{ .compatible = "ti,lp5012", .data = &lp50xx_chip_info_tbl[LP5012] },
{ .compatible = "ti,lp5018", .data = &lp50xx_chip_info_tbl[LP5018] },
{ .compatible = "ti,lp5024", .data = &lp50xx_chip_info_tbl[LP5024] },
{ .compatible = "ti,lp5030", .data = &lp50xx_chip_info_tbl[LP5030] },
{ .compatible = "ti,lp5036", .data = &lp50xx_chip_info_tbl[LP5036] },
{}
};
MODULE_DEVICE_TABLE(of, of_lp50xx_leds_match);
static struct i2c_driver lp50xx_driver = {
.driver = {
.name = "lp50xx",
.of_match_table = of_lp50xx_leds_match,
},
.probe_new = lp50xx_probe,
.remove = lp50xx_remove,
.id_table = lp50xx_id,
};
module_i2c_driver(lp50xx_driver);
MODULE_DESCRIPTION("Texas Instruments LP50XX LED driver");
MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_LICENSE("GPL v2");
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