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70c6cce0 QZ |
1 | /* |
2 | * I2C driver for Marvell 88PM80x | |
3 | * | |
4 | * Copyright (C) 2012 Marvell International Ltd. | |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
6 | * Joseph(Yossi) Hanin <yhanin@marvell.com> | |
7 | * Qiao Zhou <zhouqiao@marvell.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/mfd/88pm80x.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/uaccess.h> | |
19 | #include <linux/err.h> | |
20 | ||
5500e396 QZ |
21 | /* |
22 | * workaround: some registers needed by pm805 are defined in pm800, so | |
23 | * need to use this global variable to maintain the relation between | |
24 | * pm800 and pm805. would remove it after HW chip fixes the issue. | |
25 | */ | |
26 | static struct pm80x_chip *g_pm80x_chip; | |
70c6cce0 QZ |
27 | |
28 | const struct regmap_config pm80x_regmap_config = { | |
29 | .reg_bits = 8, | |
30 | .val_bits = 8, | |
31 | }; | |
78a73e59 | 32 | EXPORT_SYMBOL_GPL(pm80x_regmap_config); |
70c6cce0 QZ |
33 | |
34 | int __devinit pm80x_init(struct i2c_client *client, | |
35 | const struct i2c_device_id *id) | |
36 | { | |
37 | struct pm80x_chip *chip; | |
38 | struct regmap *map; | |
39 | int ret = 0; | |
40 | ||
41 | chip = | |
42 | devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL); | |
43 | if (!chip) | |
44 | return -ENOMEM; | |
45 | ||
46 | map = devm_regmap_init_i2c(client, &pm80x_regmap_config); | |
47 | if (IS_ERR(map)) { | |
48 | ret = PTR_ERR(map); | |
49 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
50 | ret); | |
51 | goto err_regmap_init; | |
52 | } | |
53 | ||
54 | chip->id = id->driver_data; | |
55 | if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805) { | |
56 | ret = -EINVAL; | |
57 | goto err_chip_id; | |
58 | } | |
59 | ||
60 | chip->client = client; | |
61 | chip->regmap = map; | |
62 | ||
63 | chip->irq = client->irq; | |
64 | ||
65 | chip->dev = &client->dev; | |
66 | dev_set_drvdata(chip->dev, chip); | |
67 | i2c_set_clientdata(chip->client, chip); | |
68 | ||
69 | device_init_wakeup(&client->dev, 1); | |
70 | ||
5500e396 QZ |
71 | /* |
72 | * workaround: set g_pm80x_chip to the first probed chip. if the | |
73 | * second chip is probed, just point to the companion to each | |
74 | * other so that pm805 can access those specific register. would | |
75 | * remove it after HW chip fixes the issue. | |
76 | */ | |
77 | if (!g_pm80x_chip) | |
78 | g_pm80x_chip = chip; | |
79 | else { | |
80 | chip->companion = g_pm80x_chip->client; | |
81 | g_pm80x_chip->companion = chip->client; | |
82 | } | |
83 | ||
70c6cce0 QZ |
84 | return 0; |
85 | ||
86 | err_chip_id: | |
87 | regmap_exit(map); | |
88 | err_regmap_init: | |
89 | devm_kfree(&client->dev, chip); | |
90 | return ret; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(pm80x_init); | |
93 | ||
706c96b7 | 94 | int pm80x_deinit(struct i2c_client *client) |
70c6cce0 QZ |
95 | { |
96 | struct pm80x_chip *chip = i2c_get_clientdata(client); | |
97 | ||
5500e396 QZ |
98 | /* |
99 | * workaround: clear the dependency between pm800 and pm805. | |
100 | * would remove it after HW chip fixes the issue. | |
101 | */ | |
102 | if (g_pm80x_chip->companion) | |
103 | g_pm80x_chip->companion = NULL; | |
104 | else | |
105 | g_pm80x_chip = NULL; | |
106 | ||
70c6cce0 QZ |
107 | regmap_exit(chip->regmap); |
108 | devm_kfree(&client->dev, chip); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(pm80x_deinit); | |
113 | ||
114 | #ifdef CONFIG_PM_SLEEP | |
115 | static int pm80x_suspend(struct device *dev) | |
116 | { | |
117 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
118 | struct pm80x_chip *chip = i2c_get_clientdata(client); | |
119 | ||
120 | if (chip && chip->wu_flag) | |
121 | if (device_may_wakeup(chip->dev)) | |
122 | enable_irq_wake(chip->irq); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static int pm80x_resume(struct device *dev) | |
128 | { | |
129 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); | |
130 | struct pm80x_chip *chip = i2c_get_clientdata(client); | |
131 | ||
132 | if (chip && chip->wu_flag) | |
133 | if (device_may_wakeup(chip->dev)) | |
134 | disable_irq_wake(chip->irq); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | #endif | |
139 | ||
140 | SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); | |
141 | EXPORT_SYMBOL_GPL(pm80x_pm_ops); | |
142 | ||
143 | MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x"); | |
144 | MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); | |
145 | MODULE_LICENSE("GPL"); |