linux/drivers/leds/leds-lm3642.c
Uwe Kleine-König ed5c2f5fd1 i2c: Make remove callback return void
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00

416 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Simple driver for Texas Instruments LM3642 LED Flash driver chip
* Copyright (C) 2012 Texas Instruments
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/platform_data/leds-lm3642.h>
#define REG_FILT_TIME (0x0)
#define REG_IVFM_MODE (0x1)
#define REG_TORCH_TIME (0x6)
#define REG_FLASH (0x8)
#define REG_I_CTRL (0x9)
#define REG_ENABLE (0xA)
#define REG_FLAG (0xB)
#define REG_MAX (0xB)
#define UVLO_EN_SHIFT (7)
#define IVM_D_TH_SHIFT (2)
#define TORCH_RAMP_UP_TIME_SHIFT (3)
#define TORCH_RAMP_DN_TIME_SHIFT (0)
#define INDUCTOR_I_LIMIT_SHIFT (6)
#define FLASH_RAMP_TIME_SHIFT (3)
#define FLASH_TOUT_TIME_SHIFT (0)
#define TORCH_I_SHIFT (4)
#define FLASH_I_SHIFT (0)
#define IVFM_SHIFT (7)
#define TX_PIN_EN_SHIFT (6)
#define STROBE_PIN_EN_SHIFT (5)
#define TORCH_PIN_EN_SHIFT (4)
#define MODE_BITS_SHIFT (0)
#define UVLO_EN_MASK (0x1)
#define IVM_D_TH_MASK (0x7)
#define TORCH_RAMP_UP_TIME_MASK (0x7)
#define TORCH_RAMP_DN_TIME_MASK (0x7)
#define INDUCTOR_I_LIMIT_MASK (0x1)
#define FLASH_RAMP_TIME_MASK (0x7)
#define FLASH_TOUT_TIME_MASK (0x7)
#define TORCH_I_MASK (0x7)
#define FLASH_I_MASK (0xF)
#define IVFM_MASK (0x1)
#define TX_PIN_EN_MASK (0x1)
#define STROBE_PIN_EN_MASK (0x1)
#define TORCH_PIN_EN_MASK (0x1)
#define MODE_BITS_MASK (0x73)
#define EX_PIN_CONTROL_MASK (0x71)
#define EX_PIN_ENABLE_MASK (0x70)
enum lm3642_mode {
MODES_STASNDBY = 0,
MODES_INDIC,
MODES_TORCH,
MODES_FLASH
};
struct lm3642_chip_data {
struct device *dev;
struct led_classdev cdev_flash;
struct led_classdev cdev_torch;
struct led_classdev cdev_indicator;
u8 br_flash;
u8 br_torch;
u8 br_indicator;
enum lm3642_torch_pin_enable torch_pin;
enum lm3642_strobe_pin_enable strobe_pin;
enum lm3642_tx_pin_enable tx_pin;
struct lm3642_platform_data *pdata;
struct regmap *regmap;
struct mutex lock;
unsigned int last_flag;
};
/* chip initialize */
static int lm3642_chip_init(struct lm3642_chip_data *chip)
{
int ret;
struct lm3642_platform_data *pdata = chip->pdata;
/* set enable register */
ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
pdata->tx_pin);
if (ret < 0)
dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
return ret;
}
/* chip control */
static int lm3642_control(struct lm3642_chip_data *chip,
u8 brightness, enum lm3642_mode opmode)
{
int ret;
ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
if (ret < 0) {
dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
return ret;
}
if (chip->last_flag)
dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
/* brightness 0 means off-state */
if (!brightness)
opmode = MODES_STASNDBY;
switch (opmode) {
case MODES_TORCH:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
TORCH_I_MASK << TORCH_I_SHIFT,
(brightness - 1) << TORCH_I_SHIFT);
if (chip->torch_pin)
opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
break;
case MODES_FLASH:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
FLASH_I_MASK << FLASH_I_SHIFT,
(brightness - 1) << FLASH_I_SHIFT);
if (chip->strobe_pin)
opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
break;
case MODES_INDIC:
ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
TORCH_I_MASK << TORCH_I_SHIFT,
(brightness - 1) << TORCH_I_SHIFT);
break;
case MODES_STASNDBY:
break;
default:
return -EINVAL;
}
if (ret < 0) {
dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
return ret;
}
if (chip->tx_pin)
opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
MODE_BITS_MASK << MODE_BITS_SHIFT,
opmode << MODE_BITS_SHIFT);
return ret;
}
/* torch */
/* torch pin config for lm3642 */
static ssize_t torch_pin_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
ssize_t ret;
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3642_chip_data *chip =
container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
unsigned int state;
ret = kstrtouint(buf, 10, &state);
if (ret)
return ret;
if (state != 0)
state = 0x01 << TORCH_PIN_EN_SHIFT;
chip->torch_pin = state;
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
state);
if (ret < 0) {
dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
return ret;
}
return size;
}
static DEVICE_ATTR_WO(torch_pin);
static int lm3642_torch_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_torch);
int ret;
mutex_lock(&chip->lock);
chip->br_torch = brightness;
ret = lm3642_control(chip, chip->br_torch, MODES_TORCH);
mutex_unlock(&chip->lock);
return ret;
}
/* flash */
/* strobe pin config for lm3642*/
static ssize_t strobe_pin_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
ssize_t ret;
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lm3642_chip_data *chip =
container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
unsigned int state;
ret = kstrtouint(buf, 10, &state);
if (ret)
return ret;
if (state != 0)
state = 0x01 << STROBE_PIN_EN_SHIFT;
chip->strobe_pin = state;
ret = regmap_update_bits(chip->regmap, REG_ENABLE,
STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
state);
if (ret < 0) {
dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
return ret;
}
return size;
}
static DEVICE_ATTR_WO(strobe_pin);
static int lm3642_strobe_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_flash);
int ret;
mutex_lock(&chip->lock);
chip->br_flash = brightness;
ret = lm3642_control(chip, chip->br_flash, MODES_FLASH);
mutex_unlock(&chip->lock);
return ret;
}
/* indicator */
static int lm3642_indicator_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lm3642_chip_data *chip =
container_of(cdev, struct lm3642_chip_data, cdev_indicator);
int ret;
mutex_lock(&chip->lock);
chip->br_indicator = brightness;
ret = lm3642_control(chip, chip->br_indicator, MODES_INDIC);
mutex_unlock(&chip->lock);
return ret;
}
static const struct regmap_config lm3642_regmap = {
.reg_bits = 8,
.val_bits = 8,
.max_register = REG_MAX,
};
static struct attribute *lm3642_flash_attrs[] = {
&dev_attr_strobe_pin.attr,
NULL
};
ATTRIBUTE_GROUPS(lm3642_flash);
static struct attribute *lm3642_torch_attrs[] = {
&dev_attr_torch_pin.attr,
NULL
};
ATTRIBUTE_GROUPS(lm3642_torch);
static int lm3642_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
struct lm3642_chip_data *chip;
int err;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "i2c functionality check fail.\n");
return -EOPNOTSUPP;
}
if (pdata == NULL) {
dev_err(&client->dev, "needs Platform Data.\n");
return -ENODATA;
}
chip = devm_kzalloc(&client->dev,
sizeof(struct lm3642_chip_data), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &client->dev;
chip->pdata = pdata;
chip->tx_pin = pdata->tx_pin;
chip->torch_pin = pdata->torch_pin;
chip->strobe_pin = pdata->strobe_pin;
chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
if (IS_ERR(chip->regmap)) {
err = PTR_ERR(chip->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n",
err);
return err;
}
mutex_init(&chip->lock);
i2c_set_clientdata(client, chip);
err = lm3642_chip_init(chip);
if (err < 0)
goto err_out;
/* flash */
chip->cdev_flash.name = "flash";
chip->cdev_flash.max_brightness = 16;
chip->cdev_flash.brightness_set_blocking = lm3642_strobe_brightness_set;
chip->cdev_flash.default_trigger = "flash";
chip->cdev_flash.groups = lm3642_flash_groups;
err = led_classdev_register(&client->dev, &chip->cdev_flash);
if (err < 0) {
dev_err(chip->dev, "failed to register flash\n");
goto err_out;
}
/* torch */
chip->cdev_torch.name = "torch";
chip->cdev_torch.max_brightness = 8;
chip->cdev_torch.brightness_set_blocking = lm3642_torch_brightness_set;
chip->cdev_torch.default_trigger = "torch";
chip->cdev_torch.groups = lm3642_torch_groups;
err = led_classdev_register(&client->dev, &chip->cdev_torch);
if (err < 0) {
dev_err(chip->dev, "failed to register torch\n");
goto err_create_torch_file;
}
/* indicator */
chip->cdev_indicator.name = "indicator";
chip->cdev_indicator.max_brightness = 8;
chip->cdev_indicator.brightness_set_blocking =
lm3642_indicator_brightness_set;
err = led_classdev_register(&client->dev, &chip->cdev_indicator);
if (err < 0) {
dev_err(chip->dev, "failed to register indicator\n");
goto err_create_indicator_file;
}
dev_info(&client->dev, "LM3642 is initialized\n");
return 0;
err_create_indicator_file:
led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
led_classdev_unregister(&chip->cdev_flash);
err_out:
return err;
}
static void lm3642_remove(struct i2c_client *client)
{
struct lm3642_chip_data *chip = i2c_get_clientdata(client);
led_classdev_unregister(&chip->cdev_indicator);
led_classdev_unregister(&chip->cdev_torch);
led_classdev_unregister(&chip->cdev_flash);
regmap_write(chip->regmap, REG_ENABLE, 0);
}
static const struct i2c_device_id lm3642_id[] = {
{LM3642_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, lm3642_id);
static struct i2c_driver lm3642_i2c_driver = {
.driver = {
.name = LM3642_NAME,
.pm = NULL,
},
.probe = lm3642_probe,
.remove = lm3642_remove,
.id_table = lm3642_id,
};
module_i2c_driver(lm3642_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
MODULE_LICENSE("GPL v2");