1/*
2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the version 2 of the GNU General Public License as
9 * published by the Free Software Foundation
10 */
11
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/mfd/as3711.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/of_regulator.h>
21#include <linux/slab.h>
22
23struct as3711_regulator_info {
24	struct regulator_desc	desc;
25};
26
27struct as3711_regulator {
28	struct as3711_regulator_info *reg_info;
29};
30
31/*
32 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
33 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
34 * FAST:	sdX_fast=1
35 * NORMAL:	low_noise=1
36 * IDLE:	low_noise=0
37 */
38
39static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
40{
41	unsigned int fast_bit = rdev->desc->enable_mask,
42		low_noise_bit = fast_bit << 4;
43	u8 val;
44
45	switch (mode) {
46	case REGULATOR_MODE_FAST:
47		val = fast_bit | low_noise_bit;
48		break;
49	case REGULATOR_MODE_NORMAL:
50		val = low_noise_bit;
51		break;
52	case REGULATOR_MODE_IDLE:
53		val = 0;
54		break;
55	default:
56		return -EINVAL;
57	}
58
59	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
60				  low_noise_bit | fast_bit, val);
61}
62
63static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
64{
65	unsigned int fast_bit = rdev->desc->enable_mask,
66		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
67	unsigned int val;
68	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
69
70	if (ret < 0)
71		return ret;
72
73	if ((val & mask) == mask)
74		return REGULATOR_MODE_FAST;
75
76	if ((val & mask) == low_noise_bit)
77		return REGULATOR_MODE_NORMAL;
78
79	if (!(val & mask))
80		return REGULATOR_MODE_IDLE;
81
82	return -EINVAL;
83}
84
85static struct regulator_ops as3711_sd_ops = {
86	.is_enabled		= regulator_is_enabled_regmap,
87	.enable			= regulator_enable_regmap,
88	.disable		= regulator_disable_regmap,
89	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
90	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
91	.list_voltage		= regulator_list_voltage_linear_range,
92	.map_voltage		= regulator_map_voltage_linear_range,
93	.get_mode		= as3711_get_mode_sd,
94	.set_mode		= as3711_set_mode_sd,
95};
96
97static struct regulator_ops as3711_aldo_ops = {
98	.is_enabled		= regulator_is_enabled_regmap,
99	.enable			= regulator_enable_regmap,
100	.disable		= regulator_disable_regmap,
101	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
102	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
103	.list_voltage		= regulator_list_voltage_linear_range,
104	.map_voltage		= regulator_map_voltage_linear_range,
105};
106
107static struct regulator_ops as3711_dldo_ops = {
108	.is_enabled		= regulator_is_enabled_regmap,
109	.enable			= regulator_enable_regmap,
110	.disable		= regulator_disable_regmap,
111	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
112	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
113	.list_voltage		= regulator_list_voltage_linear_range,
114	.map_voltage		= regulator_map_voltage_linear_range,
115};
116
117static const struct regulator_linear_range as3711_sd_ranges[] = {
118	REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
119	REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
120	REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
121};
122
123static const struct regulator_linear_range as3711_aldo_ranges[] = {
124	REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
125	REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
126};
127
128static const struct regulator_linear_range as3711_dldo_ranges[] = {
129	REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
130	REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
131};
132
133#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)			   \
134	[AS3711_REGULATOR_ ## _id] = {					   \
135	.desc = {							   \
136		.name = "as3711-regulator-" # _id,			   \
137		.id = AS3711_REGULATOR_ ## _id,				   \
138		.n_voltages = (_vmask + 1),				   \
139		.ops = &as3711_ ## _sfx ## _ops,			   \
140		.type = REGULATOR_VOLTAGE,				   \
141		.owner = THIS_MODULE,					   \
142		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,			   \
143		.vsel_mask = _vmask,					   \
144		.enable_reg = AS3711_ ## _en_reg,			   \
145		.enable_mask = BIT(_en_bit),				   \
146		.linear_ranges = as3711_ ## _sfx ## _ranges,		   \
147		.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
148	},								   \
149}
150
151static struct as3711_regulator_info as3711_reg_info[] = {
152	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
153	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
154	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
155	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
156	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
157	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
158	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
159	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
160	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
161	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
162	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
163	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
164	/* StepUp output voltage depends on supplying regulator */
165};
166
167#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
168
169static struct of_regulator_match
170as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
171	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
172	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
173	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
174	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
175	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
176	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
177	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
178	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
179	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
180	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
181	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
182	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
183};
184
185static int as3711_regulator_parse_dt(struct device *dev,
186				struct device_node **of_node, const int count)
187{
188	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
189	struct device_node *regulators =
190		of_get_child_by_name(dev->parent->of_node, "regulators");
191	struct of_regulator_match *match;
192	int ret, i;
193
194	if (!regulators) {
195		dev_err(dev, "regulator node not found\n");
196		return -ENODEV;
197	}
198
199	ret = of_regulator_match(dev->parent, regulators,
200				 as3711_regulator_matches, count);
201	of_node_put(regulators);
202	if (ret < 0) {
203		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
204		return ret;
205	}
206
207	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
208		if (match->of_node) {
209			pdata->init_data[i] = match->init_data;
210			of_node[i] = match->of_node;
211		}
212
213	return 0;
214}
215
216static int as3711_regulator_probe(struct platform_device *pdev)
217{
218	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
219	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
220	struct regulator_config config = {.dev = &pdev->dev,};
221	struct as3711_regulator *reg = NULL;
222	struct as3711_regulator *regs;
223	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
224	struct regulator_dev *rdev;
225	struct as3711_regulator_info *ri;
226	int ret;
227	int id;
228
229	if (!pdata) {
230		dev_err(&pdev->dev, "No platform data...\n");
231		return -ENODEV;
232	}
233
234	if (pdev->dev.parent->of_node) {
235		ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
236		if (ret < 0) {
237			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
238			return ret;
239		}
240	}
241
242	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
243			sizeof(struct as3711_regulator), GFP_KERNEL);
244	if (!regs)
245		return -ENOMEM;
246
247	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
248		reg = &regs[id];
249		reg->reg_info = ri;
250
251		config.init_data = pdata->init_data[id];
252		config.driver_data = reg;
253		config.regmap = as3711->regmap;
254		config.of_node = of_node[id];
255
256		rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
257		if (IS_ERR(rdev)) {
258			dev_err(&pdev->dev, "Failed to register regulator %s\n",
259				ri->desc.name);
260			return PTR_ERR(rdev);
261		}
262	}
263	platform_set_drvdata(pdev, regs);
264	return 0;
265}
266
267static struct platform_driver as3711_regulator_driver = {
268	.driver	= {
269		.name	= "as3711-regulator",
270	},
271	.probe		= as3711_regulator_probe,
272};
273
274static int __init as3711_regulator_init(void)
275{
276	return platform_driver_register(&as3711_regulator_driver);
277}
278subsys_initcall(as3711_regulator_init);
279
280static void __exit as3711_regulator_exit(void)
281{
282	platform_driver_unregister(&as3711_regulator_driver);
283}
284module_exit(as3711_regulator_exit);
285
286MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
287MODULE_DESCRIPTION("AS3711 regulator driver");
288MODULE_ALIAS("platform:as3711-regulator");
289MODULE_LICENSE("GPL v2");
290