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	},
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
132static 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
140static 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
179static 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};
186MODULE_DEVICE_TABLE(of, isl9305_dt_ids);
187#endif
188
189static const struct i2c_device_id isl9305_i2c_id[] = {
190	{ "isl9305", },
191	{ "isl9305h", },
192	{ }
193};
194MODULE_DEVICE_TABLE(i2c, isl9305_i2c_id);
195
196static 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
205module_i2c_driver(isl9305_regulator_driver);
206
207MODULE_AUTHOR("Mark Brown");
208MODULE_DESCRIPTION("Intersil ISL9305 DCDC regulator");
209MODULE_LICENSE("GPL");
210