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Date: Wed, 20 Jun 2012 14:32:32 +0800
From: Axel Lin <axel.lin@...il.com>
To: "G.Shark Jeong" <gshark.jeong@...il.com>
Cc: Bryan Wu <bryan.wu@...onical.com>,
Richard Purdie <rpurdie@...ys.net>,
Daniel Jeong <daniel.jeong@...com>,
linux-kernel@...r.kernel.org, milo kim <milo.kim@...com>
Subject: Re: [PATCH 1/1 v3] leds: Add LED driver for lm3556 chip
> +config LEDS_LM3556
> + tristate "LED support for LM3556 Chip"
> + depends on LEDS_CLASS && I2C
select REGMAP_I2C
> + help
> + This option enables support for LEDs connected LM3556.
> + LM3556 includes Torch, Flash and Indicator functions.
> +
> +/* chip initialize */
> +static int lm3556_chip_init(struct lm3556_chip_data *chip)
__devinit
> +/* torch */
> +static void lm3556_torch_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3556_chip_data *chip =
> + container_of(cdev, struct lm3556_chip_data, cdev_torch);
> +
> + mutex_lock(&chip->lock);
> + lm3556_control(chip, brightness, MODES_TORCH);
> + mutex_unlock(&chip->lock);
> + return;
^^^^^^ you don't need this return!!
> +}
> +
> +/* flash */
> +static void lm3556_strobe_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3556_chip_data *chip =
> + container_of(cdev, struct lm3556_chip_data, cdev_flash);
> +
> + mutex_lock(&chip->lock);
> + lm3556_control(chip, brightness, MODES_FLASH);
> + mutex_unlock(&chip->lock);
> + return;
^^^^^^ you don't need this return!!
> +}
> +
> +/* indicator */
> +static void lm3556_indicator_brightness_set(struct led_classdev *cdev,
> + enum led_brightness brightness)
> +{
> + struct lm3556_chip_data *chip =
> + container_of(cdev, struct lm3556_chip_data, cdev_indicator);
> +
> + mutex_lock(&chip->lock);
> + lm3556_control(chip, brightness, MODES_INDIC);
> + mutex_unlock(&chip->lock);
> + return;
^^^^^^ you don't need this return!!
> +}
> +
> +/* module initialize */
> +static int lm3556_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
__devinit
> +{
> + struct lm3556_platform_data *pdata = client->dev.platform_data;
> + struct lm3556_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 lm3556_chip_data),
> + GFP_KERNEL);
> + if (!chip)
> + return -ENOMEM;
> +
> + chip->client = client;
> + chip->pdata = pdata;
> +
> + chip->regmap = regmap_init_i2c(client, &lm3556_regmap);
devm_regmap_init_i2c
> + 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 = lm3556_chip_init(chip);
> + if (err < 0)
> + goto err_chip_init;
> +
> + /* flash */
> + chip->cdev_flash.name = "flash";
> + chip->cdev_flash.max_brightness = 16;
> + chip->cdev_flash.brightness_set = lm3556_strobe_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_flash);
> + if (err < 0)
> + goto err_create_flash_file;
> + /* torch */
> + chip->cdev_torch.name = "torch";
> + chip->cdev_torch.max_brightness = 8;
> + chip->cdev_torch.brightness_set = lm3556_torch_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_torch);
> + if (err < 0)
> + goto err_create_torch_file;
> + /* indicator */
> + chip->cdev_indicator.name = "indicator";
> + chip->cdev_indicator.max_brightness = 8;
> + chip->cdev_indicator.brightness_set = lm3556_indicator_brightness_set;
> + err = led_classdev_register((struct device *)
> + &client->dev, &chip->cdev_indicator);
> + if (err < 0)
> + goto err_create_indicator_file;
> +
> + err = device_create_file(chip->cdev_indicator.dev, &dev_attr_pattern);
> + if (err < 0)
> + goto err_create_pattern_file;
> +
> + dev_info(&client->dev, "LM3556 is initialized\n");
> + return 0;
> +
> +err_create_pattern_file:
> + led_classdev_unregister(&chip->cdev_indicator);
> +err_create_indicator_file:
> + led_classdev_unregister(&chip->cdev_torch);
> +err_create_torch_file:
> + led_classdev_unregister(&chip->cdev_flash);
> +err_create_flash_file:
> +err_chip_init:
> + i2c_set_clientdata(client, NULL);
No need to set this to NULL, it is done by i2c core.
> + return err;
> +}
> +
> +static int lm3556_remove(struct i2c_client *client)
__devexit
> +{
> + struct lm3556_chip_data *chip = i2c_get_clientdata(client);
> +
> + device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
> + 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);
> + regmap_exit(chip->regmap);
If you are using devm_regmap_init_i2c, you don't need regmap_exit call here.
> + return 0;
> +}
> +
> +static const struct i2c_device_id lm3556_id[] = {
> + {LM3556_NAME, 0},
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, lm3556_id);
> +
> +static struct i2c_driver lm3556_i2c_driver = {
> + .driver = {
> + .name = LM3556_NAME,
> + .owner = THIS_MODULE,
> + .pm = NULL,
> + },
> + .probe = lm3556_probe,
> + .remove = __devexit_p(lm3556_remove),
> + .id_table = lm3556_id,
> +};
> +
> +static int __init lm3556_init(void)
> +{
> + return i2c_add_driver(&lm3556_i2c_driver);
> +}
> +
> +static void __exit lm3556_exit(void)
> +{
> + i2c_del_driver(&lm3556_i2c_driver);
> +}
> +
> +module_init(lm3556_init);
> +module_exit(lm3556_exit);
module_i2c_driver(lm3556_i2c_driver);
--
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