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 
23 struct as3711_regulator_info {
24 	struct regulator_desc	desc;
25 };
26 
27 struct 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 
39 static 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 
63 static 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 
85 static const 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 
97 static const 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 
107 static const 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 
117 static 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 
123 static 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 
128 static 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 
151 static 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 
169 static struct of_regulator_match
170 as3711_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 
185 static 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 
216 static 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 
267 static struct platform_driver as3711_regulator_driver = {
268 	.driver	= {
269 		.name	= "as3711-regulator",
270 	},
271 	.probe		= as3711_regulator_probe,
272 };
273 
274 static int __init as3711_regulator_init(void)
275 {
276 	return platform_driver_register(&as3711_regulator_driver);
277 }
278 subsys_initcall(as3711_regulator_init);
279 
280 static void __exit as3711_regulator_exit(void)
281 {
282 	platform_driver_unregister(&as3711_regulator_driver);
283 }
284 module_exit(as3711_regulator_exit);
285 
286 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
287 MODULE_DESCRIPTION("AS3711 regulator driver");
288 MODULE_ALIAS("platform:as3711-regulator");
289 MODULE_LICENSE("GPL v2");
290