UPSTREAM: pwm: Add hardware readout infrastructure
[firefly-linux-kernel-4.4.55.git] / drivers / regulator / isl9305.c
1 /*
2  * isl9305 - Intersil ISL9305 DCDC regulator
3  *
4  * Copyright 2014 Linaro Ltd
5  *
6  * Author: Mark Brown <broonie@kernel.org>
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
12  */
13
14 #include <linux/module.h>
15 #include <linux/err.h>
16 #include <linux/i2c.h>
17 #include <linux/of.h>
18 #include <linux/platform_data/isl9305.h>
19 #include <linux/regmap.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/of_regulator.h>
22 #include <linux/slab.h>
23
24 /*
25  * Registers
26  */
27 #define ISL9305_DCD1OUT          0x0
28 #define ISL9305_DCD2OUT          0x1
29 #define ISL9305_LDO1OUT          0x2
30 #define ISL9305_LDO2OUT          0x3
31 #define ISL9305_DCD_PARAMETER    0x4
32 #define ISL9305_SYSTEM_PARAMETER 0x5
33 #define ISL9305_DCD_SRCTL        0x6
34
35 #define ISL9305_MAX_REG ISL9305_DCD_SRCTL
36
37 /*
38  * DCD_PARAMETER
39  */
40 #define ISL9305_DCD_PHASE   0x40
41 #define ISL9305_DCD2_ULTRA  0x20
42 #define ISL9305_DCD1_ULTRA  0x10
43 #define ISL9305_DCD2_BLD    0x08
44 #define ISL9305_DCD1_BLD    0x04
45 #define ISL9305_DCD2_MODE   0x02
46 #define ISL9305_DCD1_MODE   0x01
47
48 /*
49  * SYSTEM_PARAMETER
50  */
51 #define ISL9305_I2C_EN      0x40
52 #define ISL9305_DCDPOR_MASK 0x30
53 #define ISL9305_LDO2_EN     0x08
54 #define ISL9305_LDO1_EN     0x04
55 #define ISL9305_DCD2_EN     0x02
56 #define ISL9305_DCD1_EN     0x01
57
58 /*
59  * DCD_SRCTL
60  */
61 #define ISL9305_DCD2SR_MASK 0xc0
62 #define ISL9305_DCD1SR_MASK 0x07
63
64 static const struct regulator_ops isl9305_ops = {
65         .enable = regulator_enable_regmap,
66         .disable = regulator_disable_regmap,
67         .is_enabled = regulator_is_enabled_regmap,
68         .list_voltage = regulator_list_voltage_linear,
69         .get_voltage_sel = regulator_get_voltage_sel_regmap,
70         .set_voltage_sel = regulator_set_voltage_sel_regmap,
71 };
72
73 static const struct regulator_desc isl9305_regulators[] = {
74         [ISL9305_DCD1] = {
75                 .name =         "DCD1",
76                 .of_match =     of_match_ptr("dcd1"),
77                 .regulators_node = of_match_ptr("regulators"),
78                 .n_voltages =   0x70,
79                 .min_uV =       825000,
80                 .uV_step =      25000,
81                 .vsel_reg =     ISL9305_DCD1OUT,
82                 .vsel_mask =    0x7f,
83                 .enable_reg =   ISL9305_SYSTEM_PARAMETER,
84                 .enable_mask =  ISL9305_DCD1_EN,
85                 .supply_name =  "VINDCD1",
86                 .ops =          &isl9305_ops,
87         },
88         [ISL9305_DCD2] = {
89                 .name =         "DCD2",
90                 .of_match =     of_match_ptr("dcd2"),
91                 .regulators_node = of_match_ptr("regulators"),
92                 .n_voltages =   0x70,
93                 .min_uV =       825000,
94                 .uV_step =      25000,
95                 .vsel_reg =     ISL9305_DCD2OUT,
96                 .vsel_mask =    0x7f,
97                 .enable_reg =   ISL9305_SYSTEM_PARAMETER,
98                 .enable_mask =  ISL9305_DCD2_EN,
99                 .supply_name =  "VINDCD2",
100                 .ops =          &isl9305_ops,
101         },
102         [ISL9305_LDO1] = {
103                 .name =         "LDO1",
104                 .of_match =     of_match_ptr("ldo1"),
105                 .regulators_node = of_match_ptr("regulators"),
106                 .n_voltages =   0x37,
107                 .min_uV =       900000,
108                 .uV_step =      50000,
109                 .vsel_reg =     ISL9305_LDO1OUT,
110                 .vsel_mask =    0x3f,
111                 .enable_reg =   ISL9305_SYSTEM_PARAMETER,
112                 .enable_mask =  ISL9305_LDO1_EN,
113                 .supply_name =  "VINLDO1",
114                 .ops =          &isl9305_ops,
115         },
116         [ISL9305_LDO2] = {
117                 .name =         "LDO2",
118                 .of_match =     of_match_ptr("ldo2"),
119                 .regulators_node = of_match_ptr("regulators"),
120                 .n_voltages =   0x37,
121                 .min_uV =       900000,
122                 .uV_step =      50000,
123                 .vsel_reg =     ISL9305_LDO2OUT,
124                 .vsel_mask =    0x3f,
125                 .enable_reg =   ISL9305_SYSTEM_PARAMETER,
126                 .enable_mask =  ISL9305_LDO2_EN,
127                 .supply_name =  "VINLDO2",
128                 .ops =          &isl9305_ops,
129         },
130 };
131
132 static const struct regmap_config isl9305_regmap = {
133         .reg_bits = 8,
134         .val_bits = 8,
135
136         .max_register = ISL9305_MAX_REG,
137         .cache_type = REGCACHE_RBTREE,
138 };
139
140 static int isl9305_i2c_probe(struct i2c_client *i2c,
141                              const struct i2c_device_id *id)
142 {
143         struct regulator_config config = { };
144         struct isl9305_pdata *pdata = i2c->dev.platform_data;
145         struct regulator_dev *rdev;
146         struct regmap *regmap;
147         int i, ret;
148
149         regmap = devm_regmap_init_i2c(i2c, &isl9305_regmap);
150         if (IS_ERR(regmap)) {
151                 ret = PTR_ERR(regmap);
152                 dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
153                 return ret;
154         }
155
156         config.dev = &i2c->dev;
157
158         for (i = 0; i < ARRAY_SIZE(isl9305_regulators); i++) {
159                 if (pdata)
160                         config.init_data = pdata->init_data[i];
161                 else
162                         config.init_data = NULL;
163
164                 rdev = devm_regulator_register(&i2c->dev,
165                                                &isl9305_regulators[i],
166                                                &config);
167                 if (IS_ERR(rdev)) {
168                         ret = PTR_ERR(rdev);
169                         dev_err(&i2c->dev, "Failed to register %s: %d\n",
170                                 isl9305_regulators[i].name, ret);
171                         return ret;
172                 }
173         }
174
175         return 0;
176 }
177
178 #ifdef CONFIG_OF
179 static const struct of_device_id isl9305_dt_ids[] = {
180         { .compatible = "isl,isl9305" }, /* for backward compat., don't use */
181         { .compatible = "isil,isl9305" },
182         { .compatible = "isl,isl9305h" }, /* for backward compat., don't use */
183         { .compatible = "isil,isl9305h" },
184         {},
185 };
186 MODULE_DEVICE_TABLE(of, isl9305_dt_ids);
187 #endif
188
189 static const struct i2c_device_id isl9305_i2c_id[] = {
190         { "isl9305", },
191         { "isl9305h", },
192         { }
193 };
194 MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);
195
196 static struct i2c_driver isl9305_regulator_driver = {
197         .driver = {
198                 .name = "isl9305",
199                 .of_match_table = of_match_ptr(isl9305_dt_ids),
200         },
201         .probe = isl9305_i2c_probe,
202         .id_table = isl9305_i2c_id,
203 };
204
205 module_i2c_driver(isl9305_regulator_driver);
206
207 MODULE_AUTHOR("Mark Brown");
208 MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
209 MODULE_LICENSE("GPL");