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51bd6943 MV |
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> | |
51bd6943 MV |
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 | ||
a9b2899b | 38 | static int isl6271a_get_voltage_sel(struct regulator_dev *dev) |
51bd6943 MV |
39 | { |
40 | struct isl_pmic *pmic = rdev_get_drvdata(dev); | |
a9b2899b | 41 | int idx; |
51bd6943 MV |
42 | |
43 | mutex_lock(&pmic->mtx); | |
44 | ||
45 | idx = i2c_smbus_read_byte(pmic->client); | |
a9b2899b | 46 | if (idx < 0) |
51bd6943 | 47 | dev_err(&pmic->client->dev, "Error getting voltage\n"); |
51bd6943 | 48 | |
51bd6943 | 49 | mutex_unlock(&pmic->mtx); |
a9b2899b | 50 | return idx; |
51bd6943 MV |
51 | } |
52 | ||
dde2b724 AL |
53 | static int isl6271a_set_voltage_sel(struct regulator_dev *dev, |
54 | unsigned selector) | |
51bd6943 MV |
55 | { |
56 | struct isl_pmic *pmic = rdev_get_drvdata(dev); | |
dde2b724 | 57 | int err; |
3a93f2a9 | 58 | |
51bd6943 MV |
59 | mutex_lock(&pmic->mtx); |
60 | ||
dde2b724 | 61 | err = i2c_smbus_write_byte(pmic->client, selector); |
51bd6943 MV |
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 | ||
51bd6943 | 69 | static struct regulator_ops isl_core_ops = { |
a9b2899b | 70 | .get_voltage_sel = isl6271a_get_voltage_sel, |
dde2b724 | 71 | .set_voltage_sel = isl6271a_set_voltage_sel, |
2b7a7a4e | 72 | .list_voltage = regulator_list_voltage_linear, |
dde2b724 | 73 | .map_voltage = regulator_map_voltage_linear, |
51bd6943 MV |
74 | }; |
75 | ||
76 | static int isl6271a_get_fixed_voltage(struct regulator_dev *dev) | |
77 | { | |
985f769c | 78 | return dev->desc->min_uV; |
51bd6943 MV |
79 | } |
80 | ||
81 | static struct regulator_ops isl_fixed_ops = { | |
82 | .get_voltage = isl6271a_get_fixed_voltage, | |
985f769c | 83 | .list_voltage = regulator_list_voltage_linear, |
51bd6943 MV |
84 | }; |
85 | ||
4b65e159 | 86 | static const struct regulator_desc isl_rd[] = { |
51bd6943 MV |
87 | { |
88 | .name = "Core Buck", | |
89 | .id = 0, | |
90 | .n_voltages = 16, | |
91 | .ops = &isl_core_ops, | |
92 | .type = REGULATOR_VOLTAGE, | |
93 | .owner = THIS_MODULE, | |
2b7a7a4e AL |
94 | .min_uV = ISL6271A_VOLTAGE_MIN, |
95 | .uV_step = ISL6271A_VOLTAGE_STEP, | |
51bd6943 MV |
96 | }, { |
97 | .name = "LDO1", | |
98 | .id = 1, | |
99 | .n_voltages = 1, | |
100 | .ops = &isl_fixed_ops, | |
101 | .type = REGULATOR_VOLTAGE, | |
102 | .owner = THIS_MODULE, | |
985f769c | 103 | .min_uV = 1100000, |
51bd6943 MV |
104 | }, { |
105 | .name = "LDO2", | |
106 | .id = 2, | |
107 | .n_voltages = 1, | |
108 | .ops = &isl_fixed_ops, | |
109 | .type = REGULATOR_VOLTAGE, | |
110 | .owner = THIS_MODULE, | |
985f769c | 111 | .min_uV = 1300000, |
51bd6943 MV |
112 | }, |
113 | }; | |
114 | ||
115 | static int __devinit isl6271a_probe(struct i2c_client *i2c, | |
116 | const struct i2c_device_id *id) | |
117 | { | |
c172708d | 118 | struct regulator_config config = { }; |
51bd6943 MV |
119 | struct regulator_init_data *init_data = i2c->dev.platform_data; |
120 | struct isl_pmic *pmic; | |
121 | int err, i; | |
122 | ||
123 | if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
124 | return -EIO; | |
125 | ||
ef6bd5a3 | 126 | pmic = devm_kzalloc(&i2c->dev, sizeof(struct isl_pmic), GFP_KERNEL); |
51bd6943 MV |
127 | if (!pmic) |
128 | return -ENOMEM; | |
129 | ||
130 | pmic->client = i2c; | |
131 | ||
132 | mutex_init(&pmic->mtx); | |
133 | ||
134 | for (i = 0; i < 3; i++) { | |
c172708d MB |
135 | config.dev = &i2c->dev; |
136 | if (i == 0) | |
137 | config.init_data = init_data; | |
138 | else | |
139 | config.init_data = 0; | |
140 | config.driver_data = pmic; | |
141 | ||
142 | pmic->rdev[i] = regulator_register(&isl_rd[i], &config); | |
51bd6943 MV |
143 | if (IS_ERR(pmic->rdev[i])) { |
144 | dev_err(&i2c->dev, "failed to register %s\n", id->name); | |
fa63bd4a | 145 | err = PTR_ERR(pmic->rdev[i]); |
51bd6943 MV |
146 | goto error; |
147 | } | |
148 | } | |
149 | ||
150 | i2c_set_clientdata(i2c, pmic); | |
151 | ||
152 | return 0; | |
153 | ||
154 | error: | |
155 | while (--i >= 0) | |
156 | regulator_unregister(pmic->rdev[i]); | |
51bd6943 MV |
157 | return err; |
158 | } | |
159 | ||
160 | static int __devexit isl6271a_remove(struct i2c_client *i2c) | |
161 | { | |
162 | struct isl_pmic *pmic = i2c_get_clientdata(i2c); | |
163 | int i; | |
164 | ||
51bd6943 MV |
165 | for (i = 0; i < 3; i++) |
166 | regulator_unregister(pmic->rdev[i]); | |
51bd6943 MV |
167 | return 0; |
168 | } | |
169 | ||
170 | static const struct i2c_device_id isl6271a_id[] = { | |
171 | {.name = "isl6271a", 0 }, | |
172 | { }, | |
173 | }; | |
174 | ||
175 | MODULE_DEVICE_TABLE(i2c, isl6271a_id); | |
176 | ||
177 | static struct i2c_driver isl6271a_i2c_driver = { | |
178 | .driver = { | |
179 | .name = "isl6271a", | |
180 | .owner = THIS_MODULE, | |
181 | }, | |
182 | .probe = isl6271a_probe, | |
183 | .remove = __devexit_p(isl6271a_remove), | |
184 | .id_table = isl6271a_id, | |
185 | }; | |
186 | ||
187 | static int __init isl6271a_init(void) | |
188 | { | |
189 | return i2c_add_driver(&isl6271a_i2c_driver); | |
190 | } | |
191 | ||
192 | static void __exit isl6271a_cleanup(void) | |
193 | { | |
194 | i2c_del_driver(&isl6271a_i2c_driver); | |
195 | } | |
196 | ||
197 | subsys_initcall(isl6271a_init); | |
198 | module_exit(isl6271a_cleanup); | |
199 | ||
200 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
201 | MODULE_DESCRIPTION("Intersil ISL6271A voltage regulator driver"); | |
202 | MODULE_LICENSE("GPL v2"); |