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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 | |
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; |
27 | |
28 | const struct regmap_config pm80x_regmap_config = { |
29 | .reg_bits = 8, |
30 | .val_bits = 8, |
31 | }; |
32 | EXPORT_SYMBOL_GPL(pm80x_regmap_config); |
33 | |
34 | int 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 | return ret; |
52 | } |
53 | |
54 | chip->id = id->driver_data; |
55 | if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805) |
56 | return -EINVAL; |
57 | |
58 | chip->client = client; |
59 | chip->regmap = map; |
60 | |
61 | chip->irq = client->irq; |
62 | |
63 | chip->dev = &client->dev; |
64 | dev_set_drvdata(chip->dev, chip); |
65 | i2c_set_clientdata(chip->client, chip); |
66 | |
67 | device_init_wakeup(&client->dev, 1); |
68 | |
69 | /* |
70 | * workaround: set g_pm80x_chip to the first probed chip. if the |
71 | * second chip is probed, just point to the companion to each |
72 | * other so that pm805 can access those specific register. would |
73 | * remove it after HW chip fixes the issue. |
74 | */ |
75 | if (!g_pm80x_chip) |
76 | g_pm80x_chip = chip; |
77 | else { |
78 | chip->companion = g_pm80x_chip->client; |
79 | g_pm80x_chip->companion = chip->client; |
80 | } |
81 | |
82 | return 0; |
83 | } |
84 | EXPORT_SYMBOL_GPL(pm80x_init); |
85 | |
86 | int pm80x_deinit(void) |
87 | { |
88 | /* |
89 | * workaround: clear the dependency between pm800 and pm805. |
90 | * would remove it after HW chip fixes the issue. |
91 | */ |
92 | if (g_pm80x_chip->companion) |
93 | g_pm80x_chip->companion = NULL; |
94 | else |
95 | g_pm80x_chip = NULL; |
96 | return 0; |
97 | } |
98 | EXPORT_SYMBOL_GPL(pm80x_deinit); |
99 | |
100 | #ifdef CONFIG_PM_SLEEP |
101 | static int pm80x_suspend(struct device *dev) |
102 | { |
103 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
104 | struct pm80x_chip *chip = i2c_get_clientdata(client); |
105 | |
106 | if (chip && chip->wu_flag) |
107 | if (device_may_wakeup(chip->dev)) |
108 | enable_irq_wake(chip->irq); |
109 | |
110 | return 0; |
111 | } |
112 | |
113 | static int pm80x_resume(struct device *dev) |
114 | { |
115 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
116 | struct pm80x_chip *chip = i2c_get_clientdata(client); |
117 | |
118 | if (chip && chip->wu_flag) |
119 | if (device_may_wakeup(chip->dev)) |
120 | disable_irq_wake(chip->irq); |
121 | |
122 | return 0; |
123 | } |
124 | #endif |
125 | |
126 | SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); |
127 | EXPORT_SYMBOL_GPL(pm80x_pm_ops); |
128 | |
129 | MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x"); |
130 | MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>"); |
131 | MODULE_LICENSE("GPL"); |
132 |
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