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