xref: /kernel/linux/linux-6.6/drivers/mfd/88pm80x.c (revision 62306a36) 
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * I2C driver for Marvell 88PM80x
4 *
5 * Copyright (C) 2012 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 * Joseph(Yossi) Hanin <yhanin@marvell.com>
8 * Qiao Zhou <zhouqiao@marvell.com>
9 */
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/i2c.h>
13#include <linux/mfd/88pm80x.h>
14#include <linux/slab.h>
15#include <linux/uaccess.h>
16#include <linux/err.h>
17
18/* 88pm80x chips have same definition for chip id register. */
19#define PM80X_CHIP_ID			(0x00)
20#define PM80X_CHIP_ID_NUM(x)		(((x) >> 5) & 0x7)
21#define PM80X_CHIP_ID_REVISION(x)	((x) & 0x1F)
22
23struct pm80x_chip_mapping {
24	unsigned int	id;
25	int		type;
26};
27
28static struct pm80x_chip_mapping chip_mapping[] = {
29	/* 88PM800 chip id number */
30	{0x3,	CHIP_PM800},
31	/* 88PM805 chip id number */
32	{0x0,	CHIP_PM805},
33	/* 88PM860 chip id number */
34	{0x4,	CHIP_PM860},
35};
36
37/*
38 * workaround: some registers needed by pm805 are defined in pm800, so
39 * need to use this global variable to maintain the relation between
40 * pm800 and pm805. would remove it after HW chip fixes the issue.
41 */
42static struct pm80x_chip *g_pm80x_chip;
43
44const struct regmap_config pm80x_regmap_config = {
45	.reg_bits = 8,
46	.val_bits = 8,
47};
48EXPORT_SYMBOL_GPL(pm80x_regmap_config);
49
50
51int pm80x_init(struct i2c_client *client)
52{
53	struct pm80x_chip *chip;
54	struct regmap *map;
55	unsigned int val;
56	int i, ret = 0;
57
58	chip =
59	    devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
60	if (!chip)
61		return -ENOMEM;
62
63	map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
64	if (IS_ERR(map)) {
65		ret = PTR_ERR(map);
66		dev_err(&client->dev, "Failed to allocate register map: %d\n",
67			ret);
68		return ret;
69	}
70
71	chip->client = client;
72	chip->regmap = map;
73
74	chip->irq = client->irq;
75
76	chip->dev = &client->dev;
77	i2c_set_clientdata(chip->client, chip);
78
79	ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
80	if (ret < 0) {
81		dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
82		return ret;
83	}
84
85	for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
86		if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
87			chip->type = chip_mapping[i].type;
88			break;
89		}
90	}
91
92	if (i == ARRAY_SIZE(chip_mapping)) {
93		dev_err(chip->dev,
94			"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
95		return -EINVAL;
96	}
97
98	device_init_wakeup(&client->dev, 1);
99
100	/*
101	 * workaround: set g_pm80x_chip to the first probed chip. if the
102	 * second chip is probed, just point to the companion to each
103	 * other so that pm805 can access those specific register. would
104	 * remove it after HW chip fixes the issue.
105	 */
106	if (!g_pm80x_chip)
107		g_pm80x_chip = chip;
108	else {
109		chip->companion = g_pm80x_chip->client;
110		g_pm80x_chip->companion = chip->client;
111	}
112
113	return 0;
114}
115EXPORT_SYMBOL_GPL(pm80x_init);
116
117int pm80x_deinit(void)
118{
119	/*
120	 * workaround: clear the dependency between pm800 and pm805.
121	 * would remove it after HW chip fixes the issue.
122	 */
123	if (g_pm80x_chip->companion)
124		g_pm80x_chip->companion = NULL;
125	else
126		g_pm80x_chip = NULL;
127	return 0;
128}
129EXPORT_SYMBOL_GPL(pm80x_deinit);
130
131static int pm80x_suspend(struct device *dev)
132{
133	struct i2c_client *client = to_i2c_client(dev);
134	struct pm80x_chip *chip = i2c_get_clientdata(client);
135
136	if (chip && chip->wu_flag)
137		if (device_may_wakeup(chip->dev))
138			enable_irq_wake(chip->irq);
139
140	return 0;
141}
142
143static int pm80x_resume(struct device *dev)
144{
145	struct i2c_client *client = to_i2c_client(dev);
146	struct pm80x_chip *chip = i2c_get_clientdata(client);
147
148	if (chip && chip->wu_flag)
149		if (device_may_wakeup(chip->dev))
150			disable_irq_wake(chip->irq);
151
152	return 0;
153}
154
155EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
156
157MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
158MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
159MODULE_LICENSE("GPL");
160