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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"); |