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Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +01001/*
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>
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +010016#include <linux/of.h>
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010017#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/regulator/driver.h>
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +010020#include <linux/regulator/of_regulator.h>
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010021#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
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010033/*
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
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010087static 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,
Axel Lin9234c632013-07-16 16:34:39 +080093 .list_voltage = regulator_list_voltage_linear_range,
94 .map_voltage = regulator_map_voltage_linear_range,
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010095 .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,
Axel Lin9234c632013-07-16 16:34:39 +0800105 .list_voltage = regulator_list_voltage_linear_range,
106 .map_voltage = regulator_map_voltage_linear_range,
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100107};
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,
Axel Lin9234c632013-07-16 16:34:39 +0800115 .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 { .min_uV = 612500, .max_uV = 1400000,
121 .min_sel = 0x1, .max_sel = 0x40, .uV_step = 12500 },
122 { .min_uV = 1425000, .max_uV = 2600000,
123 .min_sel = 0x41, .max_sel = 0x70, .uV_step = 25000 },
124 { .min_uV = 2650000, .max_uV = 3350000,
125 .min_sel = 0x71, .max_sel = 0x7f, .uV_step = 50000 },
126};
127
128static const struct regulator_linear_range as3711_aldo_ranges[] = {
129 { .min_uV = 1200000, .max_uV = 1950000,
130 .min_sel = 0, .max_sel = 0xf, .uV_step = 50000 },
131 { .min_uV = 1800000, .max_uV = 3300000,
132 .min_sel = 0x10, .max_sel = 0x1f, .uV_step = 100000 },
133};
134
135static const struct regulator_linear_range as3711_dldo_ranges[] = {
136 { .min_uV = 900000, .max_uV = 1700000,
137 .min_sel = 0, .max_sel = 0x10, .uV_step = 50000 },
138 { .min_uV = 1750000, .max_uV = 3300000,
139 .min_sel = 0x20, .max_sel = 0x3f, .uV_step = 50000 },
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100140};
141
142#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \
143 [AS3711_REGULATOR_ ## _id] = { \
144 .desc = { \
145 .name = "as3711-regulator-" # _id, \
146 .id = AS3711_REGULATOR_ ## _id, \
147 .n_voltages = (_vmask + 1), \
148 .ops = &as3711_ ## _sfx ## _ops, \
149 .type = REGULATOR_VOLTAGE, \
150 .owner = THIS_MODULE, \
151 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
152 .vsel_mask = _vmask << _vshift, \
153 .enable_reg = AS3711_ ## _en_reg, \
154 .enable_mask = BIT(_en_bit), \
155 .min_uV = _min_uV, \
Axel Lin9234c632013-07-16 16:34:39 +0800156 .linear_ranges = as3711_ ## _sfx ## _ranges, \
157 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100158 }, \
159 .max_uV = _max_uV, \
160}
161
162static struct as3711_regulator_info as3711_reg_info[] = {
163 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
164 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
165 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
166 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
167 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
168 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
169 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
170 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
171 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
172 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
173 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
174 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
175 /* StepUp output voltage depends on supplying regulator */
176};
177
178#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
179
Axel Lind6c7d732013-04-17 16:01:22 +0800180static struct of_regulator_match
181as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
182 [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
183 [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
184 [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
185 [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
186 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
187 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
188 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
189 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
190 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
191 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
192 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
193 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100194};
195
196static int as3711_regulator_parse_dt(struct device *dev,
197 struct device_node **of_node, const int count)
198{
199 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
200 struct device_node *regulators =
201 of_find_node_by_name(dev->parent->of_node, "regulators");
Axel Lind6c7d732013-04-17 16:01:22 +0800202 struct of_regulator_match *match;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100203 int ret, i;
204
205 if (!regulators) {
206 dev_err(dev, "regulator node not found\n");
207 return -ENODEV;
208 }
209
Axel Lind6c7d732013-04-17 16:01:22 +0800210 ret = of_regulator_match(dev->parent, regulators,
211 as3711_regulator_matches, count);
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100212 of_node_put(regulators);
213 if (ret < 0) {
214 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
215 return ret;
216 }
217
Axel Lind6c7d732013-04-17 16:01:22 +0800218 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100219 if (match->of_node) {
220 pdata->init_data[i] = match->init_data;
221 of_node[i] = match->of_node;
222 }
223
224 return 0;
225}
226
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100227static int as3711_regulator_probe(struct platform_device *pdev)
228{
229 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
230 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
231 struct regulator_init_data *reg_data;
232 struct regulator_config config = {.dev = &pdev->dev,};
233 struct as3711_regulator *reg = NULL;
234 struct as3711_regulator *regs;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100235 struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100236 struct regulator_dev *rdev;
237 struct as3711_regulator_info *ri;
238 int ret;
239 int id;
240
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100241 if (!pdata) {
242 dev_err(&pdev->dev, "No platform data...\n");
243 return -ENODEV;
244 }
245
246 if (pdev->dev.parent->of_node) {
247 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
248 if (ret < 0) {
249 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
250 return ret;
251 }
252 }
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100253
254 regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
255 sizeof(struct as3711_regulator), GFP_KERNEL);
256 if (!regs) {
257 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
258 return -ENOMEM;
259 }
260
261 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100262 reg_data = pdata->init_data[id];
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100263
264 /* No need to register if there is no regulator data */
Axel Lin09ca50d2013-02-13 09:34:48 +0800265 if (!reg_data)
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100266 continue;
267
268 reg = &regs[id];
269 reg->reg_info = ri;
270
271 config.init_data = reg_data;
272 config.driver_data = reg;
273 config.regmap = as3711->regmap;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100274 config.of_node = of_node[id];
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100275
276 rdev = regulator_register(&ri->desc, &config);
277 if (IS_ERR(rdev)) {
278 dev_err(&pdev->dev, "Failed to register regulator %s\n",
279 ri->desc.name);
280 ret = PTR_ERR(rdev);
281 goto eregreg;
282 }
283 reg->rdev = rdev;
284 }
285 platform_set_drvdata(pdev, regs);
286 return 0;
287
288eregreg:
289 while (--id >= 0)
290 regulator_unregister(regs[id].rdev);
291
292 return ret;
293}
294
295static int as3711_regulator_remove(struct platform_device *pdev)
296{
297 struct as3711_regulator *regs = platform_get_drvdata(pdev);
298 int id;
299
300 for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
301 regulator_unregister(regs[id].rdev);
302 return 0;
303}
304
305static struct platform_driver as3711_regulator_driver = {
306 .driver = {
307 .name = "as3711-regulator",
308 .owner = THIS_MODULE,
309 },
310 .probe = as3711_regulator_probe,
311 .remove = as3711_regulator_remove,
312};
313
314static int __init as3711_regulator_init(void)
315{
316 return platform_driver_register(&as3711_regulator_driver);
317}
318subsys_initcall(as3711_regulator_init);
319
320static void __exit as3711_regulator_exit(void)
321{
322 platform_driver_unregister(&as3711_regulator_driver);
323}
324module_exit(as3711_regulator_exit);
325
326MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
327MODULE_DESCRIPTION("AS3711 regulator driver");
328MODULE_ALIAS("platform:as3711-regulator");
329MODULE_LICENSE("GPL v2");