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};
37
38/*
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;
44
45const struct regmap_config pm80x_regmap_config = {
46	.reg_bits = 8,
47	.val_bits = 8,
48};
49EXPORT_SYMBOL_GPL(pm80x_regmap_config);
50
51
52int pm80x_init(struct i2c_client *client)
53{
54	struct pm80x_chip *chip;
55	struct regmap *map;
56	unsigned int val;
57	int i, ret = 0;
58
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);
69		return ret;
70	}
71
72	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
81	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
100	device_init_wakeup(&client->dev, 1);
101
102	/*
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
115	return 0;
116}
117EXPORT_SYMBOL_GPL(pm80x_init);
118
119int pm80x_deinit(void)
120{
121	/*
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;
129	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");
165