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Program execution is timed with 32768Hz clock in the LP55xx family devices. To run LED functionalities, LP55xx devices provide two options. One is using internal clock. The other is using external clock. This patch enables external clock detection automatically. If external clock is not detected, then the internal clock will be used in the LP55xx driver. Valid clock rate is 32768Hz in LP55xx devices. This new API is used in each LP55xx driver like LP5521 and LP5562. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
139 lines
4.0 KiB
C
139 lines
4.0 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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};
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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_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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* @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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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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#endif /* _LEDS_LP55XX_COMMON_H */
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