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1 | /* |
2 | * isl6271a-regulator.c |
3 | * |
4 | * Support for Intersil ISL6271A voltage regulator |
5 | * |
6 | * Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com> |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License as |
10 | * published by the Free Software Foundation version 2. |
11 | * |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, |
13 | * whether express or implied; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * General Public License for more details. |
16 | */ |
17 | |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> |
20 | #include <linux/init.h> |
21 | #include <linux/err.h> |
22 | #include <linux/platform_device.h> |
23 | #include <linux/regulator/driver.h> |
24 | #include <linux/i2c.h> |
25 | #include <linux/slab.h> |
26 | |
27 | #define ISL6271A_VOLTAGE_MIN 850000 |
28 | #define ISL6271A_VOLTAGE_MAX 1600000 |
29 | #define ISL6271A_VOLTAGE_STEP 50000 |
30 | |
31 | /* PMIC details */ |
32 | struct isl_pmic { |
33 | struct i2c_client *client; |
34 | struct regulator_dev *rdev[3]; |
35 | struct mutex mtx; |
36 | }; |
37 | |
38 | static int isl6271a_get_voltage_sel(struct regulator_dev *dev) |
39 | { |
40 | struct isl_pmic *pmic = rdev_get_drvdata(dev); |
41 | int idx; |
42 | |
43 | mutex_lock(&pmic->mtx); |
44 | |
45 | idx = i2c_smbus_read_byte(pmic->client); |
46 | if (idx < 0) |
47 | dev_err(&pmic->client->dev, "Error getting voltage\n"); |
48 | |
49 | mutex_unlock(&pmic->mtx); |
50 | return idx; |
51 | } |
52 | |
53 | static int isl6271a_set_voltage_sel(struct regulator_dev *dev, |
54 | unsigned selector) |
55 | { |
56 | struct isl_pmic *pmic = rdev_get_drvdata(dev); |
57 | int err; |
58 | |
59 | mutex_lock(&pmic->mtx); |
60 | |
61 | err = i2c_smbus_write_byte(pmic->client, selector); |
62 | if (err < 0) |
63 | dev_err(&pmic->client->dev, "Error setting voltage\n"); |
64 | |
65 | mutex_unlock(&pmic->mtx); |
66 | return err; |
67 | } |
68 | |
69 | static struct regulator_ops isl_core_ops = { |
70 | .get_voltage_sel = isl6271a_get_voltage_sel, |
71 | .set_voltage_sel = isl6271a_set_voltage_sel, |
72 | .list_voltage = regulator_list_voltage_linear, |
73 | .map_voltage = regulator_map_voltage_linear, |
74 | }; |
75 | |
76 | static struct regulator_ops isl_fixed_ops = { |
77 | .list_voltage = regulator_list_voltage_linear, |
78 | }; |
79 | |
80 | static const struct regulator_desc isl_rd[] = { |
81 | { |
82 | .name = "Core Buck", |
83 | .id = 0, |
84 | .n_voltages = 16, |
85 | .ops = &isl_core_ops, |
86 | .type = REGULATOR_VOLTAGE, |
87 | .owner = THIS_MODULE, |
88 | .min_uV = ISL6271A_VOLTAGE_MIN, |
89 | .uV_step = ISL6271A_VOLTAGE_STEP, |
90 | }, { |
91 | .name = "LDO1", |
92 | .id = 1, |
93 | .n_voltages = 1, |
94 | .ops = &isl_fixed_ops, |
95 | .type = REGULATOR_VOLTAGE, |
96 | .owner = THIS_MODULE, |
97 | .min_uV = 1100000, |
98 | }, { |
99 | .name = "LDO2", |
100 | .id = 2, |
101 | .n_voltages = 1, |
102 | .ops = &isl_fixed_ops, |
103 | .type = REGULATOR_VOLTAGE, |
104 | .owner = THIS_MODULE, |
105 | .min_uV = 1300000, |
106 | }, |
107 | }; |
108 | |
109 | static int isl6271a_probe(struct i2c_client *i2c, |
110 | const struct i2c_device_id *id) |
111 | { |
112 | struct regulator_config config = { }; |
113 | struct regulator_init_data *init_data = i2c->dev.platform_data; |
114 | struct isl_pmic *pmic; |
115 | int err, i; |
116 | |
117 | if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
118 | return -EIO; |
119 | |
120 | pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL); |
121 | if (!pmic) |
122 | return -ENOMEM; |
123 | |
124 | pmic->client = i2c; |
125 | |
126 | mutex_init(&pmic->mtx); |
127 | |
128 | for (i = 0; i < 3; i++) { |
129 | config.dev = &i2c->dev; |
130 | if (i == 0) |
131 | config.init_data = init_data; |
132 | else |
133 | config.init_data = 0; |
134 | config.driver_data = pmic; |
135 | |
136 | pmic->rdev[i] = regulator_register(&isl_rd[i], &config); |
137 | if (IS_ERR(pmic->rdev[i])) { |
138 | dev_err(&i2c->dev, "failed to register %s\n", id->name); |
139 | err = PTR_ERR(pmic->rdev[i]); |
140 | goto error; |
141 | } |
142 | } |
143 | |
144 | i2c_set_clientdata(i2c, pmic); |
145 | |
146 | return 0; |
147 | |
148 | error: |
149 | while (--i >= 0) |
150 | regulator_unregister(pmic->rdev[i]); |
151 | return err; |
152 | } |
153 | |
154 | static int isl6271a_remove(struct i2c_client *i2c) |
155 | { |
156 | struct isl_pmic *pmic = i2c_get_clientdata(i2c); |
157 | int i; |
158 | |
159 | for (i = 0; i < 3; i++) |
160 | regulator_unregister(pmic->rdev[i]); |
161 | return 0; |
162 | } |
163 | |
164 | static const struct i2c_device_id isl6271a_id[] = { |
165 | {.name = "isl6271a", 0 }, |
166 | { }, |
167 | }; |
168 | |
169 | MODULE_DEVICE_TABLE(i2c, isl6271a_id); |
170 | |
171 | static struct i2c_driver isl6271a_i2c_driver = { |
172 | .driver = { |
173 | .name = "isl6271a", |
174 | .owner = THIS_MODULE, |
175 | }, |
176 | .probe = isl6271a_probe, |
177 | .remove = isl6271a_remove, |
178 | .id_table = isl6271a_id, |
179 | }; |
180 | |
181 | static int __init isl6271a_init(void) |
182 | { |
183 | return i2c_add_driver(&isl6271a_i2c_driver); |
184 | } |
185 | |
186 | static void __exit isl6271a_cleanup(void) |
187 | { |
188 | i2c_del_driver(&isl6271a_i2c_driver); |
189 | } |
190 | |
191 | subsys_initcall(isl6271a_init); |
192 | module_exit(isl6271a_cleanup); |
193 | |
194 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); |
195 | MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver"); |
196 | MODULE_LICENSE("GPL v2"); |
197 |
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