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	unsigned int		max_uV;
 26};
 27
 28struct as3711_regulator {
 29	struct as3711_regulator_info *reg_info;
 30	struct regulator_dev *rdev;
 31};
 32
 33/*
 34 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 35 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 36 * FAST:	sdX_fast=1
 37 * NORMAL:	low_noise=1
 38 * IDLE:	low_noise=0
 39 */
 40
 41static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
 42{
 43	unsigned int fast_bit = rdev->desc->enable_mask,
 44		low_noise_bit = fast_bit << 4;
 45	u8 val;
 46
 47	switch (mode) {
 48	case REGULATOR_MODE_FAST:
 49		val = fast_bit | low_noise_bit;
 50		break;
 51	case REGULATOR_MODE_NORMAL:
 52		val = low_noise_bit;
 53		break;
 54	case REGULATOR_MODE_IDLE:
 55		val = 0;
 56		break;
 57	default:
 58		return -EINVAL;
 59	}
 60
 61	return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
 62				  low_noise_bit | fast_bit, val);
 63}
 64
 65static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
 66{
 67	unsigned int fast_bit = rdev->desc->enable_mask,
 68		low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
 69	unsigned int val;
 70	int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
 71
 72	if (ret < 0)
 73		return ret;
 74
 75	if ((val & mask) == mask)
 76		return REGULATOR_MODE_FAST;
 77
 78	if ((val & mask) == low_noise_bit)
 79		return REGULATOR_MODE_NORMAL;
 80
 81	if (!(val & mask))
 82		return REGULATOR_MODE_IDLE;
 83
 84	return -EINVAL;
 85}
 86
 87static struct regulator_ops as3711_sd_ops = {
 88	.is_enabled		= regulator_is_enabled_regmap,
 89	.enable			= regulator_enable_regmap,
 90	.disable		= regulator_disable_regmap,
 91	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 92	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 93	.list_voltage		= regulator_list_voltage_linear_range,
 94	.map_voltage		= regulator_map_voltage_linear_range,
 95	.get_mode		= as3711_get_mode_sd,
 96	.set_mode		= as3711_set_mode_sd,
 97};
 98
 99static struct regulator_ops as3711_aldo_ops = {
100	.is_enabled		= regulator_is_enabled_regmap,
101	.enable			= regulator_enable_regmap,
102	.disable		= regulator_disable_regmap,
103	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
104	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
105	.list_voltage		= regulator_list_voltage_linear_range,
106	.map_voltage		= regulator_map_voltage_linear_range,
107};
108
109static struct regulator_ops as3711_dldo_ops = {
110	.is_enabled		= regulator_is_enabled_regmap,
111	.enable			= regulator_enable_regmap,
112	.disable		= regulator_disable_regmap,
113	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
114	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
115	.list_voltage		= regulator_list_voltage_linear_range,
116	.map_voltage		= regulator_map_voltage_linear_range,
117};
118
119static const struct regulator_linear_range as3711_sd_ranges[] = {
120	REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
121	REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
122	REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
123};
124
125static const struct regulator_linear_range as3711_aldo_ranges[] = {
126	REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
127	REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
128};
129
130static const struct regulator_linear_range as3711_dldo_ranges[] = {
131	REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
132	REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
133};
134
135#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)	\
136	[AS3711_REGULATOR_ ## _id] = {							\
137	.desc = {									\
138		.name = "as3711-regulator-" # _id,					\
139		.id = AS3711_REGULATOR_ ## _id,						\
140		.n_voltages = (_vmask + 1),						\
141		.ops = &as3711_ ## _sfx ## _ops,					\
142		.type = REGULATOR_VOLTAGE,						\
143		.owner = THIS_MODULE,							\
144		.vsel_reg = AS3711_ ## _id ## _VOLTAGE,					\
145		.vsel_mask = _vmask << _vshift,						\
146		.enable_reg = AS3711_ ## _en_reg,					\
147		.enable_mask = BIT(_en_bit),						\
148		.min_uV	= _min_uV,							\
149		.linear_ranges = as3711_ ## _sfx ## _ranges,				\
150		.n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges),		\
151	},										\
152	.max_uV = _max_uV,								\
153}
154
155static struct as3711_regulator_info as3711_reg_info[] = {
156	AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
157	AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
158	AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
159	AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
160	AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
161	AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
162	AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
163	AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
164	AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
165	AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
166	AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
167	AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
168	/* StepUp output voltage depends on supplying regulator */
169};
170
171#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
172
173static struct of_regulator_match
174as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
175	[AS3711_REGULATOR_SD_1] = { .name = "sd1" },
176	[AS3711_REGULATOR_SD_2] = { .name = "sd2" },
177	[AS3711_REGULATOR_SD_3] = { .name = "sd3" },
178	[AS3711_REGULATOR_SD_4] = { .name = "sd4" },
179	[AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
180	[AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
181	[AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
182	[AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
183	[AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
184	[AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
185	[AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
186	[AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
187};
188
189static int as3711_regulator_parse_dt(struct device *dev,
190				struct device_node **of_node, const int count)
191{
192	struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
193	struct device_node *regulators =
194		of_get_child_by_name(dev->parent->of_node, "regulators");
195	struct of_regulator_match *match;
196	int ret, i;
197
198	if (!regulators) {
199		dev_err(dev, "regulator node not found\n");
200		return -ENODEV;
201	}
202
203	ret = of_regulator_match(dev->parent, regulators,
204				 as3711_regulator_matches, count);
205	of_node_put(regulators);
206	if (ret < 0) {
207		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
208		return ret;
209	}
210
211	for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
212		if (match->of_node) {
213			pdata->init_data[i] = match->init_data;
214			of_node[i] = match->of_node;
215		}
216
217	return 0;
218}
219
220static int as3711_regulator_probe(struct platform_device *pdev)
221{
222	struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
223	struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
224	struct regulator_config config = {.dev = &pdev->dev,};
225	struct as3711_regulator *reg = NULL;
226	struct as3711_regulator *regs;
227	struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
228	struct regulator_dev *rdev;
229	struct as3711_regulator_info *ri;
230	int ret;
231	int id;
232
233	if (!pdata) {
234		dev_err(&pdev->dev, "No platform data...\n");
235		return -ENODEV;
236	}
237
238	if (pdev->dev.parent->of_node) {
239		ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
240		if (ret < 0) {
241			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
242			return ret;
243		}
244	}
245
246	regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
247			sizeof(struct as3711_regulator), GFP_KERNEL);
248	if (!regs)
249		return -ENOMEM;
250
251	for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
252		reg = &regs[id];
253		reg->reg_info = ri;
254
255		config.init_data = pdata->init_data[id];
256		config.driver_data = reg;
257		config.regmap = as3711->regmap;
258		config.of_node = of_node[id];
259
260		rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
261		if (IS_ERR(rdev)) {
262			dev_err(&pdev->dev, "Failed to register regulator %s\n",
263				ri->desc.name);
264			return PTR_ERR(rdev);
265		}
266		reg->rdev = rdev;
267	}
268	platform_set_drvdata(pdev, regs);
269	return 0;
270}
271
272static struct platform_driver as3711_regulator_driver = {
273	.driver	= {
274		.name	= "as3711-regulator",
275		.owner	= THIS_MODULE,
276	},
277	.probe		= as3711_regulator_probe,
278};
279
280static int __init as3711_regulator_init(void)
281{
282	return platform_driver_register(&as3711_regulator_driver);
283}
284subsys_initcall(as3711_regulator_init);
285
286static void __exit as3711_regulator_exit(void)
287{
288	platform_driver_unregister(&as3711_regulator_driver);
289}
290module_exit(as3711_regulator_exit);
291
292MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
293MODULE_DESCRIPTION("AS3711 regulator driver");
294MODULE_ALIAS("platform:as3711-regulator");
295MODULE_LICENSE("GPL v2");