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Qiao Zhou70c6cce2012-07-09 14:37:32 +08001/*
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
Chao Xie03dcc542013-06-14 01:21:51 -040021/* 88pm80x chips have same definition for chip id register. */
22#define PM80X_CHIP_ID (0x00)
23#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
24#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
25
26struct pm80x_chip_mapping {
27 unsigned int id;
28 int type;
29};
30
31static struct pm80x_chip_mapping chip_mapping[] = {
32 /* 88PM800 chip id number */
33 {0x3, CHIP_PM800},
34 /* 88PM805 chip id number */
35 {0x0, CHIP_PM805},
36};
37
Qiao Zhou5500e392012-07-09 14:37:33 +080038/*
39 * workaround: some registers needed by pm805 are defined in pm800, so
40 * need to use this global variable to maintain the relation between
41 * pm800 and pm805. would remove it after HW chip fixes the issue.
42 */
43static struct pm80x_chip *g_pm80x_chip;
Qiao Zhou70c6cce2012-07-09 14:37:32 +080044
45const struct regmap_config pm80x_regmap_config = {
46 .reg_bits = 8,
47 .val_bits = 8,
48};
Axel Lin78a73e52012-07-09 22:44:21 +080049EXPORT_SYMBOL_GPL(pm80x_regmap_config);
Qiao Zhou70c6cce2012-07-09 14:37:32 +080050
Chao Xie03dcc542013-06-14 01:21:51 -040051
52int pm80x_init(struct i2c_client *client)
Qiao Zhou70c6cce2012-07-09 14:37:32 +080053{
54 struct pm80x_chip *chip;
55 struct regmap *map;
Chao Xie03dcc542013-06-14 01:21:51 -040056 unsigned int val;
57 int i, ret = 0;
Qiao Zhou70c6cce2012-07-09 14:37:32 +080058
59 chip =
60 devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
61 if (!chip)
62 return -ENOMEM;
63
64 map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
65 if (IS_ERR(map)) {
66 ret = PTR_ERR(map);
67 dev_err(&client->dev, "Failed to allocate register map: %d\n",
68 ret);
Yi Zhang306df792013-01-22 10:43:45 +080069 return ret;
Qiao Zhou70c6cce2012-07-09 14:37:32 +080070 }
71
Qiao Zhou70c6cce2012-07-09 14:37:32 +080072 chip->client = client;
73 chip->regmap = map;
74
75 chip->irq = client->irq;
76
77 chip->dev = &client->dev;
78 dev_set_drvdata(chip->dev, chip);
79 i2c_set_clientdata(chip->client, chip);
80
Chao Xie03dcc542013-06-14 01:21:51 -040081 ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
82 if (ret < 0) {
83 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
84 return ret;
85 }
86
87 for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
88 if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
89 chip->type = chip_mapping[i].type;
90 break;
91 }
92 }
93
94 if (i == ARRAY_SIZE(chip_mapping)) {
95 dev_err(chip->dev,
96 "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
97 return -EINVAL;
98 }
99
Qiao Zhou70c6cce2012-07-09 14:37:32 +0800100 device_init_wakeup(&client->dev, 1);
101
Qiao Zhou5500e392012-07-09 14:37:33 +0800102 /*
103 * workaround: set g_pm80x_chip to the first probed chip. if the
104 * second chip is probed, just point to the companion to each
105 * other so that pm805 can access those specific register. would
106 * remove it after HW chip fixes the issue.
107 */
108 if (!g_pm80x_chip)
109 g_pm80x_chip = chip;
110 else {
111 chip->companion = g_pm80x_chip->client;
112 g_pm80x_chip->companion = chip->client;
113 }
114
Qiao Zhou70c6cce2012-07-09 14:37:32 +0800115 return 0;
Qiao Zhou70c6cce2012-07-09 14:37:32 +0800116}
117EXPORT_SYMBOL_GPL(pm80x_init);
118
Yi Zhang306df792013-01-22 10:43:45 +0800119int pm80x_deinit(void)
Qiao Zhou70c6cce2012-07-09 14:37:32 +0800120{
Qiao Zhou5500e392012-07-09 14:37:33 +0800121 /*
122 * workaround: clear the dependency between pm800 and pm805.
123 * would remove it after HW chip fixes the issue.
124 */
125 if (g_pm80x_chip->companion)
126 g_pm80x_chip->companion = NULL;
127 else
128 g_pm80x_chip = NULL;
Qiao Zhou70c6cce2012-07-09 14:37:32 +0800129 return 0;
130}
131EXPORT_SYMBOL_GPL(pm80x_deinit);
132
133#ifdef CONFIG_PM_SLEEP
134static int pm80x_suspend(struct device *dev)
135{
136 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
137 struct pm80x_chip *chip = i2c_get_clientdata(client);
138
139 if (chip && chip->wu_flag)
140 if (device_may_wakeup(chip->dev))
141 enable_irq_wake(chip->irq);
142
143 return 0;
144}
145
146static int pm80x_resume(struct device *dev)
147{
148 struct i2c_client *client = container_of(dev, struct i2c_client, dev);
149 struct pm80x_chip *chip = i2c_get_clientdata(client);
150
151 if (chip && chip->wu_flag)
152 if (device_may_wakeup(chip->dev))
153 disable_irq_wake(chip->irq);
154
155 return 0;
156}
157#endif
158
159SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
160EXPORT_SYMBOL_GPL(pm80x_pm_ops);
161
162MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
163MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
164MODULE_LICENSE("GPL");