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(dev: &client->dev, size: 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(ptr: map)) { |
65 | ret = PTR_ERR(ptr: 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(client: chip->client, data: chip); |
78 | |
79 | ret = regmap_read(map: chip->regmap, PM80X_CHIP_ID, val: &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(dev: &client->dev, enable: 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 | } |
115 | EXPORT_SYMBOL_GPL(pm80x_init); |
116 | |
117 | int 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 | } |
129 | EXPORT_SYMBOL_GPL(pm80x_deinit); |
130 | |
131 | static 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(dev: chip->dev)) |
138 | enable_irq_wake(irq: chip->irq); |
139 | |
140 | return 0; |
141 | } |
142 | |
143 | static 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(dev: chip->dev)) |
150 | disable_irq_wake(irq: chip->irq); |
151 | |
152 | return 0; |
153 | } |
154 | |
155 | EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume); |
156 | |
157 | MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x" ); |
158 | MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>" ); |
159 | MODULE_LICENSE("GPL" ); |
160 | |