48068d5de1
LP5521/5523 reset device functions are moved to lp55xx common driver. Value of register address and value are chip dependent. Those are configured in each driver. In init function, reset command is executed. Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
113 lines
2.3 KiB
C
113 lines
2.3 KiB
C
/*
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* LP5521/LP5523/LP55231 Common Driver
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*
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* Copyright 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 modify
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* it under the terms of the GNU General Public License version 2 as
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* 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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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include "leds-lp55xx-common.h"
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static void lp55xx_reset_device(struct lp55xx_chip *chip)
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{
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struct lp55xx_device_config *cfg = chip->cfg;
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u8 addr = cfg->reset.addr;
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u8 val = cfg->reset.val;
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/* no error checking here because no ACK from the device after reset */
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lp55xx_write(chip, addr, val);
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}
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int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
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{
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return i2c_smbus_write_byte_data(chip->cl, reg, val);
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}
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EXPORT_SYMBOL_GPL(lp55xx_write);
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int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
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{
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s32 ret;
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ret = i2c_smbus_read_byte_data(chip->cl, reg);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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}
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EXPORT_SYMBOL_GPL(lp55xx_read);
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int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
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{
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int ret;
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u8 tmp;
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ret = lp55xx_read(chip, reg, &tmp);
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if (ret)
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return ret;
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tmp &= ~mask;
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tmp |= val & mask;
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return lp55xx_write(chip, reg, tmp);
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}
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EXPORT_SYMBOL_GPL(lp55xx_update_bits);
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int lp55xx_init_device(struct lp55xx_chip *chip)
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{
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struct lp55xx_platform_data *pdata;
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struct lp55xx_device_config *cfg;
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struct device *dev = &chip->cl->dev;
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int ret = 0;
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WARN_ON(!chip);
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pdata = chip->pdata;
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cfg = chip->cfg;
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if (!pdata || !cfg)
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return -EINVAL;
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if (pdata->setup_resources) {
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ret = pdata->setup_resources();
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if (ret < 0) {
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dev_err(dev, "setup resoure err: %d\n", ret);
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goto err;
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}
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}
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if (pdata->enable) {
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pdata->enable(0);
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usleep_range(1000, 2000); /* Keep enable down at least 1ms */
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pdata->enable(1);
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usleep_range(1000, 2000); /* 500us abs min. */
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}
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lp55xx_reset_device(chip);
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/*
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* Exact value is not available. 10 - 20ms
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* appears to be enough for reset.
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*/
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usleep_range(10000, 20000);
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err:
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return ret;
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}
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EXPORT_SYMBOL_GPL(lp55xx_init_device);
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MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
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MODULE_DESCRIPTION("LP55xx Common Driver");
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MODULE_LICENSE("GPL");
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