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
64static 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
73static 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 .owner = THIS_MODULE,
88 },
89 [ISL9305_DCD2] = {
90 .name = "DCD2",
91 .of_match = of_match_ptr("dcd2"),
92 .regulators_node = of_match_ptr("regulators"),
93 .n_voltages = 0x70,
94 .min_uV = 825000,
95 .uV_step = 25000,
96 .vsel_reg = ISL9305_DCD2OUT,
97 .vsel_mask = 0x7f,
98 .enable_reg = ISL9305_SYSTEM_PARAMETER,
99 .enable_mask = ISL9305_DCD2_EN,
100 .supply_name = "VINDCD2",
101 .ops = &isl9305_ops,
102 .owner = THIS_MODULE,
103 },
104 [ISL9305_LDO1] = {
105 .name = "LDO1",
106 .of_match = of_match_ptr("ldo1"),
107 .regulators_node = of_match_ptr("regulators"),
108 .n_voltages = 0x37,
109 .min_uV = 900000,
110 .uV_step = 50000,
111 .vsel_reg = ISL9305_LDO1OUT,
112 .vsel_mask = 0x3f,
113 .enable_reg = ISL9305_SYSTEM_PARAMETER,
114 .enable_mask = ISL9305_LDO1_EN,
115 .supply_name = "VINLDO1",
116 .ops = &isl9305_ops,
117 .owner = THIS_MODULE,
118 },
119 [ISL9305_LDO2] = {
120 .name = "LDO2",
121 .of_match = of_match_ptr("ldo2"),
122 .regulators_node = of_match_ptr("regulators"),
123 .n_voltages = 0x37,
124 .min_uV = 900000,
125 .uV_step = 50000,
126 .vsel_reg = ISL9305_LDO2OUT,
127 .vsel_mask = 0x3f,
128 .enable_reg = ISL9305_SYSTEM_PARAMETER,
129 .enable_mask = ISL9305_LDO2_EN,
130 .supply_name = "VINLDO2",
131 .ops = &isl9305_ops,
132 .owner = THIS_MODULE,
133 },
134};
135
136static const struct regmap_config isl9305_regmap = {
137 .reg_bits = 8,
138 .val_bits = 8,
139
140 .max_register = ISL9305_MAX_REG,
141 .cache_type = REGCACHE_RBTREE,
142};
143
144static int isl9305_i2c_probe(struct i2c_client *i2c,
145 const struct i2c_device_id *id)
146{
147 struct regulator_config config = { };
148 struct isl9305_pdata *pdata = i2c->dev.platform_data;
149 struct regulator_dev *rdev;
150 struct regmap *regmap;
151 int i, ret;
152
153 regmap = devm_regmap_init_i2c(i2c, &isl9305_regmap);
154 if (IS_ERR(regmap)) {
155 ret = PTR_ERR(regmap);
156 dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);
157 return ret;
158 }
159
160 config.dev = &i2c->dev;
161
162 for (i = 0; i < ARRAY_SIZE(isl9305_regulators); i++) {
163 if (pdata)
164 config.init_data = pdata->init_data[i];
165 else
166 config.init_data = NULL;
167
168 rdev = devm_regulator_register(&i2c->dev,
169 &isl9305_regulators[i],
170 &config);
171 if (IS_ERR(rdev)) {
172 ret = PTR_ERR(rdev);
173 dev_err(&i2c->dev, "Failed to register %s: %d\n",
174 isl9305_regulators[i].name, ret);
175 return ret;
176 }
177 }
178
179 return 0;
180}
181
182#ifdef CONFIG_OF
183static const struct of_device_id isl9305_dt_ids[] = {
184 { .compatible = "isl,isl9305" }, /* for backward compat., don't use */
185 { .compatible = "isil,isl9305" },
186 { .compatible = "isl,isl9305h" }, /* for backward compat., don't use */
187 { .compatible = "isil,isl9305h" },
188 {},
189};
190MODULE_DEVICE_TABLE(of, isl9305_dt_ids);
191#endif
192
193static const struct i2c_device_id isl9305_i2c_id[] = {
194 { "isl9305", },
195 { "isl9305h", },
196 { }
197};
198MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);
199
200static struct i2c_driver isl9305_regulator_driver = {
201 .driver = {
202 .name = "isl9305",
203 .of_match_table = of_match_ptr(isl9305_dt_ids),
204 },
205 .probe = isl9305_i2c_probe,
206 .id_table = isl9305_i2c_id,
207};
208
209module_i2c_driver(isl9305_regulator_driver);
210
211MODULE_AUTHOR("Mark Brown");
212MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
213MODULE_LICENSE("GPL");
214