1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * isl6271a-regulator.c |
4 | * |
5 | * Support for Intersil ISL6271A voltage regulator |
6 | * |
7 | * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/err.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/regulator/driver.h> |
16 | #include <linux/i2c.h> |
17 | #include <linux/slab.h> |
18 | |
19 | #define ISL6271A_VOLTAGE_MIN 850000 |
20 | #define ISL6271A_VOLTAGE_MAX 1600000 |
21 | #define ISL6271A_VOLTAGE_STEP 50000 |
22 | |
23 | /* PMIC details */ |
24 | struct isl_pmic { |
25 | struct i2c_client *client; |
26 | struct mutex mtx; |
27 | }; |
28 | |
29 | static int isl6271a_get_voltage_sel(struct regulator_dev *dev) |
30 | { |
31 | struct isl_pmic *pmic = rdev_get_drvdata(rdev: dev); |
32 | int idx; |
33 | |
34 | mutex_lock(&pmic->mtx); |
35 | |
36 | idx = i2c_smbus_read_byte(client: pmic->client); |
37 | if (idx < 0) |
38 | dev_err(&pmic->client->dev, "Error getting voltage\n" ); |
39 | |
40 | mutex_unlock(lock: &pmic->mtx); |
41 | return idx; |
42 | } |
43 | |
44 | static int isl6271a_set_voltage_sel(struct regulator_dev *dev, |
45 | unsigned selector) |
46 | { |
47 | struct isl_pmic *pmic = rdev_get_drvdata(rdev: dev); |
48 | int err; |
49 | |
50 | mutex_lock(&pmic->mtx); |
51 | |
52 | err = i2c_smbus_write_byte(client: pmic->client, value: selector); |
53 | if (err < 0) |
54 | dev_err(&pmic->client->dev, "Error setting voltage\n" ); |
55 | |
56 | mutex_unlock(lock: &pmic->mtx); |
57 | return err; |
58 | } |
59 | |
60 | static const struct regulator_ops isl_core_ops = { |
61 | .get_voltage_sel = isl6271a_get_voltage_sel, |
62 | .set_voltage_sel = isl6271a_set_voltage_sel, |
63 | .list_voltage = regulator_list_voltage_linear, |
64 | .map_voltage = regulator_map_voltage_linear, |
65 | }; |
66 | |
67 | static const struct regulator_ops isl_fixed_ops = { |
68 | .list_voltage = regulator_list_voltage_linear, |
69 | }; |
70 | |
71 | static const struct regulator_desc isl_rd[] = { |
72 | { |
73 | .name = "Core Buck" , |
74 | .id = 0, |
75 | .n_voltages = 16, |
76 | .ops = &isl_core_ops, |
77 | .type = REGULATOR_VOLTAGE, |
78 | .owner = THIS_MODULE, |
79 | .min_uV = ISL6271A_VOLTAGE_MIN, |
80 | .uV_step = ISL6271A_VOLTAGE_STEP, |
81 | }, { |
82 | .name = "LDO1" , |
83 | .id = 1, |
84 | .n_voltages = 1, |
85 | .ops = &isl_fixed_ops, |
86 | .type = REGULATOR_VOLTAGE, |
87 | .owner = THIS_MODULE, |
88 | .min_uV = 1100000, |
89 | }, { |
90 | .name = "LDO2" , |
91 | .id = 2, |
92 | .n_voltages = 1, |
93 | .ops = &isl_fixed_ops, |
94 | .type = REGULATOR_VOLTAGE, |
95 | .owner = THIS_MODULE, |
96 | .min_uV = 1300000, |
97 | }, |
98 | }; |
99 | |
100 | static int isl6271a_probe(struct i2c_client *i2c) |
101 | { |
102 | const struct i2c_device_id *id = i2c_client_get_device_id(client: i2c); |
103 | struct regulator_dev *rdev; |
104 | struct regulator_config config = { }; |
105 | struct regulator_init_data *init_data = dev_get_platdata(dev: &i2c->dev); |
106 | struct isl_pmic *pmic; |
107 | int i; |
108 | |
109 | if (!i2c_check_functionality(adap: i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
110 | return -EIO; |
111 | |
112 | pmic = devm_kzalloc(dev: &i2c->dev, size: sizeof(struct isl_pmic), GFP_KERNEL); |
113 | if (!pmic) |
114 | return -ENOMEM; |
115 | |
116 | pmic->client = i2c; |
117 | |
118 | mutex_init(&pmic->mtx); |
119 | |
120 | for (i = 0; i < 3; i++) { |
121 | config.dev = &i2c->dev; |
122 | if (i == 0) |
123 | config.init_data = init_data; |
124 | else |
125 | config.init_data = NULL; |
126 | config.driver_data = pmic; |
127 | |
128 | rdev = devm_regulator_register(dev: &i2c->dev, regulator_desc: &isl_rd[i], config: &config); |
129 | if (IS_ERR(ptr: rdev)) { |
130 | dev_err(&i2c->dev, "failed to register %s\n" , id->name); |
131 | return PTR_ERR(ptr: rdev); |
132 | } |
133 | } |
134 | |
135 | i2c_set_clientdata(client: i2c, data: pmic); |
136 | |
137 | return 0; |
138 | } |
139 | |
140 | static const struct i2c_device_id isl6271a_id[] = { |
141 | {.name = "isl6271a" , 0 }, |
142 | { }, |
143 | }; |
144 | |
145 | MODULE_DEVICE_TABLE(i2c, isl6271a_id); |
146 | |
147 | static struct i2c_driver isl6271a_i2c_driver = { |
148 | .driver = { |
149 | .name = "isl6271a" , |
150 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
151 | }, |
152 | .probe = isl6271a_probe, |
153 | .id_table = isl6271a_id, |
154 | }; |
155 | |
156 | static int __init isl6271a_init(void) |
157 | { |
158 | return i2c_add_driver(&isl6271a_i2c_driver); |
159 | } |
160 | |
161 | static void __exit isl6271a_cleanup(void) |
162 | { |
163 | i2c_del_driver(driver: &isl6271a_i2c_driver); |
164 | } |
165 | |
166 | subsys_initcall(isl6271a_init); |
167 | module_exit(isl6271a_cleanup); |
168 | |
169 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>" ); |
170 | MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver" ); |
171 | MODULE_LICENSE("GPL v2" ); |
172 | |