leds-lp55xx-common.h
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/*
* LP55XX Common Driver Header
*
* Copyright (C) 2012 Texas Instruments
*
* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* Derived from leds-lp5521.c, leds-lp5523.c
*/
#ifndef _LEDS_LP55XX_COMMON_H
#define _LEDS_LP55XX_COMMON_H
enum lp55xx_engine_index {
LP55XX_ENGINE_INVALID,
LP55XX_ENGINE_1,
LP55XX_ENGINE_2,
LP55XX_ENGINE_3,
LP55XX_ENGINE_MAX = LP55XX_ENGINE_3,
};
enum lp55xx_engine_mode {
LP55XX_ENGINE_DISABLED,
LP55XX_ENGINE_LOAD,
LP55XX_ENGINE_RUN,
};
#define LP55XX_DEV_ATTR_RW(name, show, store) \
DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show, store)
#define LP55XX_DEV_ATTR_RO(name, show) \
DEVICE_ATTR(name, S_IRUGO, show, NULL)
#define LP55XX_DEV_ATTR_WO(name, store) \
DEVICE_ATTR(name, S_IWUSR, NULL, store)
#define show_mode(nr) \
static ssize_t show_engine##nr##_mode(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return show_engine_mode(dev, attr, buf, nr); \
}
#define store_mode(nr) \
static ssize_t store_engine##nr##_mode(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_mode(dev, attr, buf, len, nr); \
}
#define show_leds(nr) \
static ssize_t show_engine##nr##_leds(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return show_engine_leds(dev, attr, buf, nr); \
}
#define store_leds(nr) \
static ssize_t store_engine##nr##_leds(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_leds(dev, attr, buf, len, nr); \
}
#define store_load(nr) \
static ssize_t store_engine##nr##_load(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_load(dev, attr, buf, len, nr); \
}
struct lp55xx_led;
struct lp55xx_chip;
/*
* struct lp55xx_reg
* @addr : Register address
* @val : Register value
*/
struct lp55xx_reg {
u8 addr;
u8 val;
};
/*
* struct lp55xx_device_config
* @reset : Chip specific reset command
* @enable : Chip specific enable command
* @max_channel : Maximum number of channels
* @post_init_device : Chip specific initialization code
* @brightness_work_fn : Brightness work function
* @set_led_current : LED current set function
* @firmware_cb : Call function when the firmware is loaded
* @run_engine : Run internal engine for pattern
* @dev_attr_group : Device specific attributes
*/
struct lp55xx_device_config {
const struct lp55xx_reg reset;
const struct lp55xx_reg enable;
const int max_channel;
/* define if the device has specific initialization process */
int (*post_init_device) (struct lp55xx_chip *chip);
/* access brightness register */
void (*brightness_work_fn)(struct work_struct *work);
/* current setting function */
void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
/* access program memory when the firmware is loaded */
void (*firmware_cb)(struct lp55xx_chip *chip);
/* used for running firmware LED patterns */
void (*run_engine) (struct lp55xx_chip *chip, bool start);
/* additional device specific attributes */
const struct attribute_group *dev_attr_group;
};
/*
* struct lp55xx_engine
* @mode : Engine mode
* @led_mux : Mux bits for LED selection. Only used in LP5523
*/
struct lp55xx_engine {
enum lp55xx_engine_mode mode;
u16 led_mux;
};
/*
* struct lp55xx_chip
* @cl : I2C communication for access registers
* @pdata : Platform specific data
* @lock : Lock for user-space interface
* @num_leds : Number of registered LEDs
* @cfg : Device specific configuration data
* @engine_idx : Selected engine number
* @engines : Engine structure for the device attribute R/W interface
* @fw : Firmware data for running a LED pattern
*/
struct lp55xx_chip {
struct i2c_client *cl;
struct clk *clk;
struct lp55xx_platform_data *pdata;
struct mutex lock; /* lock for user-space interface */
int num_leds;
struct lp55xx_device_config *cfg;
enum lp55xx_engine_index engine_idx;
struct lp55xx_engine engines[LP55XX_ENGINE_MAX];
const struct firmware *fw;
};
/*
* struct lp55xx_led
* @chan_nr : Channel number
* @cdev : LED class device
* @led_current : Current setting at each led channel
* @max_current : Maximun current at each led channel
* @brightness_work : Workqueue for brightness control
* @brightness : Brightness value
* @chip : The lp55xx chip data
*/
struct lp55xx_led {
int chan_nr;
struct led_classdev cdev;
u8 led_current;
u8 max_current;
struct work_struct brightness_work;
u8 brightness;
struct lp55xx_chip *chip;
};
/* register access */
extern int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val);
extern int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val);
extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
u8 mask, u8 val);
/* external clock detection */
extern bool lp55xx_is_extclk_used(struct lp55xx_chip *chip);
/* common device init/deinit functions */
extern int lp55xx_init_device(struct lp55xx_chip *chip);
extern void lp55xx_deinit_device(struct lp55xx_chip *chip);
/* common LED class device functions */
extern int lp55xx_register_leds(struct lp55xx_led *led,
struct lp55xx_chip *chip);
extern void lp55xx_unregister_leds(struct lp55xx_led *led,
struct lp55xx_chip *chip);
/* common device attributes functions */
extern int lp55xx_register_sysfs(struct lp55xx_chip *chip);
extern void lp55xx_unregister_sysfs(struct lp55xx_chip *chip);
/* common device tree population function */
extern struct lp55xx_platform_data
*lp55xx_of_populate_pdata(struct device *dev, struct device_node *np);
#endif /* _LEDS_LP55XX_COMMON_H */