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/* 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 /* 88PM860 chip id number */
37 {0x4, CHIP_PM860},
38};
39
40/*
41 * workaround: some registers needed by pm805 are defined in pm800, so
42 * need to use this global variable to maintain the relation between
43 * pm800 and pm805. would remove it after HW chip fixes the issue.
44 */
45static struct pm80x_chip *g_pm80x_chip;
46
47const struct regmap_config pm80x_regmap_config = {
48 .reg_bits = 8,
49 .val_bits = 8,
50};
51EXPORT_SYMBOL_GPL(pm80x_regmap_config);
52
53
54int pm80x_init(struct i2c_client *client)
55{
56 struct pm80x_chip *chip;
57 struct regmap *map;
58 unsigned int val;
59 int i, ret = 0;
60
61 chip =
62 devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
63 if (!chip)
64 return -ENOMEM;
65
66 map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
67 if (IS_ERR(map)) {
68 ret = PTR_ERR(map);
69 dev_err(&client->dev, "Failed to allocate register map: %d\n",
70 ret);
71 return ret;
72 }
73
74 chip->client = client;
75 chip->regmap = map;
76
77 chip->irq = client->irq;
78
79 chip->dev = &client->dev;
80 dev_set_drvdata(chip->dev, chip);
81 i2c_set_clientdata(chip->client, chip);
82
83 ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
84 if (ret < 0) {
85 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
86 return ret;
87 }
88
89 for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
90 if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
91 chip->type = chip_mapping[i].type;
92 break;
93 }
94 }
95
96 if (i == ARRAY_SIZE(chip_mapping)) {
97 dev_err(chip->dev,
98 "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
99 return -EINVAL;
100 }
101
102 device_init_wakeup(&client->dev, 1);
103
104 /*
105 * workaround: set g_pm80x_chip to the first probed chip. if the
106 * second chip is probed, just point to the companion to each
107 * other so that pm805 can access those specific register. would
108 * remove it after HW chip fixes the issue.
109 */
110 if (!g_pm80x_chip)
111 g_pm80x_chip = chip;
112 else {
113 chip->companion = g_pm80x_chip->client;
114 g_pm80x_chip->companion = chip->client;
115 }
116
117 return 0;
118}
119EXPORT_SYMBOL_GPL(pm80x_init);
120
121int pm80x_deinit(void)
122{
123 /*
124 * workaround: clear the dependency between pm800 and pm805.
125 * would remove it after HW chip fixes the issue.
126 */
127 if (g_pm80x_chip->companion)
128 g_pm80x_chip->companion = NULL;
129 else
130 g_pm80x_chip = NULL;
131 return 0;
132}
133EXPORT_SYMBOL_GPL(pm80x_deinit);
134
135#ifdef CONFIG_PM_SLEEP
136static int pm80x_suspend(struct device *dev)
137{
138 struct i2c_client *client = to_i2c_client(dev);
139 struct pm80x_chip *chip = i2c_get_clientdata(client);
140
141 if (chip && chip->wu_flag)
142 if (device_may_wakeup(chip->dev))
143 enable_irq_wake(chip->irq);
144
145 return 0;
146}
147
148static int pm80x_resume(struct device *dev)
149{
150 struct i2c_client *client = to_i2c_client(dev);
151 struct pm80x_chip *chip = i2c_get_clientdata(client);
152
153 if (chip && chip->wu_flag)
154 if (device_may_wakeup(chip->dev))
155 disable_irq_wake(chip->irq);
156
157 return 0;
158}
159#endif
160
161SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
162EXPORT_SYMBOL_GPL(pm80x_pm_ops);
163
164MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
165MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
166MODULE_LICENSE("GPL");
167