GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / mfd / 88pm80x.c
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
23 struct pm80x_chip_mapping {
24         unsigned int    id;
25         int             type;
26 };
27
28 static 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  */
42 static struct pm80x_chip *g_pm80x_chip;
43
44 const struct regmap_config pm80x_regmap_config = {
45         .reg_bits = 8,
46         .val_bits = 8,
47 };
48 EXPORT_SYMBOL_GPL(pm80x_regmap_config);
49
50
51 int 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         dev_set_drvdata(chip->dev, chip);
78         i2c_set_clientdata(chip->client, chip);
79
80         ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
81         if (ret < 0) {
82                 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
83                 return ret;
84         }
85
86         for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
87                 if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
88                         chip->type = chip_mapping[i].type;
89                         break;
90                 }
91         }
92
93         if (i == ARRAY_SIZE(chip_mapping)) {
94                 dev_err(chip->dev,
95                         "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
96                 return -EINVAL;
97         }
98
99         device_init_wakeup(&client->dev, 1);
100
101         /*
102          * workaround: set g_pm80x_chip to the first probed chip. if the
103          * second chip is probed, just point to the companion to each
104          * other so that pm805 can access those specific register. would
105          * remove it after HW chip fixes the issue.
106          */
107         if (!g_pm80x_chip)
108                 g_pm80x_chip = chip;
109         else {
110                 chip->companion = g_pm80x_chip->client;
111                 g_pm80x_chip->companion = chip->client;
112         }
113
114         return 0;
115 }
116 EXPORT_SYMBOL_GPL(pm80x_init);
117
118 int pm80x_deinit(void)
119 {
120         /*
121          * workaround: clear the dependency between pm800 and pm805.
122          * would remove it after HW chip fixes the issue.
123          */
124         if (g_pm80x_chip->companion)
125                 g_pm80x_chip->companion = NULL;
126         else
127                 g_pm80x_chip = NULL;
128         return 0;
129 }
130 EXPORT_SYMBOL_GPL(pm80x_deinit);
131
132 #ifdef CONFIG_PM_SLEEP
133 static int pm80x_suspend(struct device *dev)
134 {
135         struct i2c_client *client = to_i2c_client(dev);
136         struct pm80x_chip *chip = i2c_get_clientdata(client);
137
138         if (chip && chip->wu_flag)
139                 if (device_may_wakeup(chip->dev))
140                         enable_irq_wake(chip->irq);
141
142         return 0;
143 }
144
145 static int pm80x_resume(struct device *dev)
146 {
147         struct i2c_client *client = to_i2c_client(dev);
148         struct pm80x_chip *chip = i2c_get_clientdata(client);
149
150         if (chip && chip->wu_flag)
151                 if (device_may_wakeup(chip->dev))
152                         disable_irq_wake(chip->irq);
153
154         return 0;
155 }
156 #endif
157
158 SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
159 EXPORT_SYMBOL_GPL(pm80x_pm_ops);
160
161 MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
162 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
163 MODULE_LICENSE("GPL");