projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c93d08fa MWK |
1 | /* |
| 2 | * LP5521/LP5523/LP55231 Common Driver | |
| 3 | * | |
| 4 | * Copyright 2012 Texas Instruments | |
| 5 | * | |
| 6 | * Author: Milo(Woogyom) Kim <milo.kim@ti.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | * | |
| 12 | * Derived from leds-lp5521.c, leds-lp5523.c | |
| 13 | */ | |
| 14 | ||
| a85908dd | 15 | #include <linux/delay.h> |
| c93d08fa MWK |
16 | #include <linux/i2c.h> |
| 17 | #include <linux/leds.h> | |
| 18 | #include <linux/module.h> | |
| 19 | #include <linux/platform_data/leds-lp55xx.h> | |
| 20 | ||
| 21 | #include "leds-lp55xx-common.h" | |
| 22 | ||
| 48068d5d MWK |
23 | static void lp55xx_reset_device(struct lp55xx_chip *chip) |
| 24 | { | |
| 25 | struct lp55xx_device_config *cfg = chip->cfg; | |
| 26 | u8 addr = cfg->reset.addr; | |
| 27 | u8 val = cfg->reset.val; | |
| 28 | ||
| 29 | /* no error checking here because no ACK from the device after reset */ | |
| 30 | lp55xx_write(chip, addr, val); | |
| 31 | } | |
| 32 | ||
| c93d08fa MWK |
33 | int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) |
| 34 | { | |
| 35 | return i2c_smbus_write_byte_data(chip->cl, reg, val); | |
| 36 | } | |
| 37 | EXPORT_SYMBOL_GPL(lp55xx_write); | |
| 38 | ||
| 39 | int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) | |
| 40 | { | |
| 41 | s32 ret; | |
| 42 | ||
| 43 | ret = i2c_smbus_read_byte_data(chip->cl, reg); | |
| 44 | if (ret < 0) | |
| 45 | return ret; | |
| 46 | ||
| 47 | *val = ret; | |
| 48 | return 0; | |
| 49 | } | |
| 50 | EXPORT_SYMBOL_GPL(lp55xx_read); | |
| 51 | ||
| 52 | int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) | |
| 53 | { | |
| 54 | int ret; | |
| 55 | u8 tmp; | |
| 56 | ||
| 57 | ret = lp55xx_read(chip, reg, &tmp); | |
| 58 | if (ret) | |
| 59 | return ret; | |
| 60 | ||
| 61 | tmp &= ~mask; | |
| 62 | tmp |= val & mask; | |
| 63 | ||
| 64 | return lp55xx_write(chip, reg, tmp); | |
| 65 | } | |
| 66 | EXPORT_SYMBOL_GPL(lp55xx_update_bits); | |
| 67 | ||
| a85908dd MWK |
68 | int lp55xx_init_device(struct lp55xx_chip *chip) |
| 69 | { | |
| 70 | struct lp55xx_platform_data *pdata; | |
| 48068d5d | 71 | struct lp55xx_device_config *cfg; |
| a85908dd MWK |
72 | struct device *dev = &chip->cl->dev; |
| 73 | int ret = 0; | |
| 74 | ||
| 75 | WARN_ON(!chip); | |
| 76 | ||
| 77 | pdata = chip->pdata; | |
| 48068d5d | 78 | cfg = chip->cfg; |
| a85908dd | 79 | |
| 48068d5d | 80 | if (!pdata || !cfg) |
| a85908dd MWK |
81 | return -EINVAL; |
| 82 | ||
| 83 | if (pdata->setup_resources) { | |
| 84 | ret = pdata->setup_resources(); | |
| 85 | if (ret < 0) { | |
| 86 | dev_err(dev, "setup resoure err: %d\n", ret); | |
| 87 | goto err; | |
| 88 | } | |
| 89 | } | |
| 90 | ||
| 91 | if (pdata->enable) { | |
| 92 | pdata->enable(0); | |
| 93 | usleep_range(1000, 2000); /* Keep enable down at least 1ms */ | |
| 94 | pdata->enable(1); | |
| 95 | usleep_range(1000, 2000); /* 500us abs min. */ | |
| 96 | } | |
| 97 | ||
| 48068d5d MWK |
98 | lp55xx_reset_device(chip); |
| 99 | ||
| 100 | /* | |
| 101 | * Exact value is not available. 10 - 20ms | |
| 102 | * appears to be enough for reset. | |
| 103 | */ | |
| 104 | usleep_range(10000, 20000); | |
| 105 | ||
| a85908dd MWK |
106 | err: |
| 107 | return ret; | |
| 108 | } | |
| 109 | EXPORT_SYMBOL_GPL(lp55xx_init_device); | |
| 110 | ||
| c93d08fa MWK |
111 | MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); |
| 112 | MODULE_DESCRIPTION("LP55xx Common Driver"); | |
| 113 | MODULE_LICENSE("GPL"); |