Source of leds-lm355x.c - linux-imx - PHYTEC BitBucket (Stash)

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​
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
#include <linux/platform_data/leds-lm355x.h>
​
enum lm355x_type {
    CHIP_LM3554 = 0,
    CHIP_LM3556,
};
​
enum lm355x_regs {
    REG_FLAG = 0,
    REG_TORCH_CFG,
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};
​
struct lm355x_chip_data {
    struct device *dev;
    enum lm355x_type type;
​
    struct led_classdev cdev_flash;
    struct led_classdev cdev_torch;
    struct led_classdev cdev_indicator;
​
    struct work_struct work_flash;
    struct work_struct work_torch;
    struct work_struct work_indicator;
​
    u8 br_flash;
    u8 br_torch;
    u8 br_indicator;
​
    struct lm355x_platform_data *pdata;
    struct regmap *regmap;
    struct mutex lock;
​
    unsigned int last_flag;
    struct lm355x_reg_data *regs;
};
​
/* specific indicator function for lm3556 */
enum lm3556_indic_pulse_time {
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        return -ENODATA;
    }
​
    return ret;
out:
    dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
    return ret;
}
​
/* chip control */
static void lm355x_control(struct lm355x_chip_data *chip,
static int lm355x_control(struct lm355x_chip_data *chip,
               u8 brightness, enum lm355x_mode opmode)
{
    int ret;
    unsigned int reg_val;
    struct lm355x_platform_data *pdata = chip->pdata;
    struct lm355x_reg_data *preg = chip->regs;
​
    ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
    if (ret < 0)
        goto out;
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                           0x01 <<
                           preg[REG_INDI_CFG].shift);
            if (ret < 0)
                goto out;
            opmode = MODE_SHDN;
        }
        break;
    case MODE_SHDN:
        break;
    default:
        return;
        return -EINVAL;
    }
    /* operation mode control */
    ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
                 preg[REG_OPMODE].mask,
                 opmode << preg[REG_OPMODE].shift);
    if (ret < 0)
        goto out;
    return;
    return ret;
out:
    dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
    return;
    return ret;
}
​
/* torch */
static void lm355x_deferred_torch_brightness_set(struct work_struct *work)
{
    struct lm355x_chip_data *chip =
        container_of(work, struct lm355x_chip_data, work_torch);
​
    mutex_lock(&chip->lock);
    lm355x_control(chip, chip->br_torch, MODE_TORCH);
    mutex_unlock(&chip->lock);
}
​
static void lm355x_torch_brightness_set(struct led_classdev *cdev,
static int lm355x_torch_brightness_set(struct led_classdev *cdev,
                    enum led_brightness brightness)
{
    struct lm355x_chip_data *chip =
        container_of(cdev, struct lm355x_chip_data, cdev_torch);
​
    chip->br_torch = brightness;
    schedule_work(&chip->work_torch);
}
​
/* flash */
static void lm355x_deferred_strobe_brightness_set(struct work_struct *work)
{
    struct lm355x_chip_data *chip =
        container_of(work, struct lm355x_chip_data, work_flash);
    int ret;
​
    mutex_lock(&chip->lock);
    lm355x_control(chip, chip->br_flash, MODE_FLASH);
    ret = lm355x_control(chip, brightness, MODE_TORCH);
    mutex_unlock(&chip->lock);
    return ret;
}
​
static void lm355x_strobe_brightness_set(struct led_classdev *cdev,
/* flash */
​
static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
                     enum led_brightness brightness)
{
    struct lm355x_chip_data *chip =
        container_of(cdev, struct lm355x_chip_data, cdev_flash);
​
    chip->br_flash = brightness;
    schedule_work(&chip->work_flash);
}
​
/* indicator */
static void lm355x_deferred_indicator_brightness_set(struct work_struct *work)
{
    struct lm355x_chip_data *chip =
        container_of(work, struct lm355x_chip_data, work_indicator);
    int ret;
​
    mutex_lock(&chip->lock);
    lm355x_control(chip, chip->br_indicator, MODE_INDIC);
    ret = lm355x_control(chip, brightness, MODE_FLASH);
    mutex_unlock(&chip->lock);
    return ret;
}
​
static void lm355x_indicator_brightness_set(struct led_classdev *cdev,
/* indicator */
​
static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
                        enum led_brightness brightness)
{
    struct lm355x_chip_data *chip =
        container_of(cdev, struct lm355x_chip_data, cdev_indicator);
    int ret;
​
    chip->br_indicator = brightness;
    schedule_work(&chip->work_indicator);
    mutex_lock(&chip->lock);
    ret = lm355x_control(chip, brightness, MODE_INDIC);
    mutex_unlock(&chip->lock);
    return ret;
}
​
/* indicator pattern only for lm3556*/
static ssize_t lm3556_indicator_pattern_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 lm355x_chip_data *chip =
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    }
​
    mutex_init(&chip->lock);
    i2c_set_clientdata(client, chip);
​
    err = lm355x_chip_init(chip);
    if (err < 0)
        goto err_out;
​
    /* flash */
    INIT_WORK(&chip->work_flash, lm355x_deferred_strobe_brightness_set);
    chip->cdev_flash.name = "flash";
    chip->cdev_flash.max_brightness = 16;
    chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set;
    chip->cdev_flash.brightness_set_blocking = lm355x_strobe_brightness_set;
    chip->cdev_flash.default_trigger = "flash";
    err = led_classdev_register((struct device *)
                    &client->dev, &chip->cdev_flash);
    if (err < 0)
        goto err_out;
    /* torch */
    INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set);
    chip->cdev_torch.name = "torch";
    chip->cdev_torch.max_brightness = 8;
    chip->cdev_torch.brightness_set = lm355x_torch_brightness_set;
    chip->cdev_torch.brightness_set_blocking = lm355x_torch_brightness_set;
    chip->cdev_torch.default_trigger = "torch";
    err = led_classdev_register((struct device *)
                    &client->dev, &chip->cdev_torch);
    if (err < 0)
        goto err_create_torch_file;
    /* indicator */
    INIT_WORK(&chip->work_indicator,
          lm355x_deferred_indicator_brightness_set);
    chip->cdev_indicator.name = "indicator";
    if (id->driver_data == CHIP_LM3554)
        chip->cdev_indicator.max_brightness = 4;
    else
        chip->cdev_indicator.max_brightness = 8;
    chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set;
    chip->cdev_indicator.brightness_set_blocking =
                    lm355x_indicator_brightness_set;
    /* indicator pattern control only for LM3556 */
    if (id->driver_data == CHIP_LM3556)
        chip->cdev_indicator.groups = lm355x_indicator_groups;
    err = led_classdev_register((struct device *)
                    &client->dev, &chip->cdev_indicator);
    if (err < 0)
        goto err_create_indicator_file;
​
    dev_info(&client->dev, "%s is initialized\n",
         lm355x_name[id->driver_data]);
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    return err;
}
​
static int lm355x_remove(struct i2c_client *client)
{
    struct lm355x_chip_data *chip = i2c_get_clientdata(client);
    struct lm355x_reg_data *preg = chip->regs;
​
    regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
    led_classdev_unregister(&chip->cdev_indicator);
    flush_work(&chip->work_indicator);
    led_classdev_unregister(&chip->cdev_torch);
    flush_work(&chip->work_torch);
    led_classdev_unregister(&chip->cdev_flash);
    flush_work(&chip->work_flash);
    dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
​
    return 0;
}
​
static const struct i2c_device_id lm355x_id[] = {
    {LM3554_NAME, CHIP_LM3554},
    {LM3556_NAME, CHIP_LM3556},
    {}
};