1/*
2 * arizona-ldo1.c -- LDO1 supply for Arizona devices
3 *
4 * Copyright 2012 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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/moduleparam.h>
16#include <linux/init.h>
17#include <linux/bitops.h>
18#include <linux/err.h>
19#include <linux/of.h>
20#include <linux/gpio/consumer.h>
21#include <linux/platform_device.h>
22#include <linux/regulator/driver.h>
23#include <linux/regulator/machine.h>
24#include <linux/regulator/of_regulator.h>
25#include <linux/slab.h>
26
27#include <linux/regulator/arizona-ldo1.h>
28
29#include <linux/mfd/arizona/core.h>
30#include <linux/mfd/arizona/pdata.h>
31#include <linux/mfd/arizona/registers.h>
32
33struct arizona_ldo1 {
34 struct regulator_dev *regulator;
35 struct regmap *regmap;
36
37 struct regulator_consumer_supply supply;
38 struct regulator_init_data init_data;
39
40 struct gpio_desc *ena_gpiod;
41};
42
43static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
44 unsigned sel)
45{
46 struct regmap *regmap = rdev_get_regmap(rdev);
47 unsigned int val;
48 int ret;
49
50 if (sel == rdev->desc->n_voltages - 1)
51 val = ARIZONA_LDO1_HI_PWR;
52 else
53 val = 0;
54
55 ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
56 ARIZONA_LDO1_HI_PWR, val);
57 if (ret != 0)
58 return ret;
59
60 if (val)
61 return 0;
62
63 return regulator_set_voltage_sel_regmap(rdev, sel);
64}
65
66static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
67{
68 struct regmap *regmap = rdev_get_regmap(rdev);
69 unsigned int val;
70 int ret;
71
72 ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
73 if (ret != 0)
74 return ret;
75
76 if (val & ARIZONA_LDO1_HI_PWR)
77 return rdev->desc->n_voltages - 1;
78
79 return regulator_get_voltage_sel_regmap(rdev);
80}
81
82static const struct regulator_ops arizona_ldo1_hc_ops = {
83 .list_voltage = regulator_list_voltage_linear_range,
84 .map_voltage = regulator_map_voltage_linear_range,
85 .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
86 .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
87 .get_bypass = regulator_get_bypass_regmap,
88 .set_bypass = regulator_set_bypass_regmap,
89};
90
91static const struct regulator_linear_range arizona_ldo1_hc_ranges[] = {
92 REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
93 REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
94};
95
96static const struct regulator_desc arizona_ldo1_hc = {
97 .name = "LDO1",
98 .supply_name = "LDOVDD",
99 .type = REGULATOR_VOLTAGE,
100 .ops = &arizona_ldo1_hc_ops,
101
102 .vsel_reg = ARIZONA_LDO1_CONTROL_1,
103 .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
104 .bypass_reg = ARIZONA_LDO1_CONTROL_1,
105 .bypass_mask = ARIZONA_LDO1_BYPASS,
106 .linear_ranges = arizona_ldo1_hc_ranges,
107 .n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
108 .n_voltages = 8,
109 .enable_time = 1500,
110 .ramp_delay = 24000,
111
112 .owner = THIS_MODULE,
113};
114
115static const struct regulator_ops arizona_ldo1_ops = {
116 .list_voltage = regulator_list_voltage_linear,
117 .map_voltage = regulator_map_voltage_linear,
118 .get_voltage_sel = regulator_get_voltage_sel_regmap,
119 .set_voltage_sel = regulator_set_voltage_sel_regmap,
120};
121
122static const struct regulator_desc arizona_ldo1 = {
123 .name = "LDO1",
124 .supply_name = "LDOVDD",
125 .type = REGULATOR_VOLTAGE,
126 .ops = &arizona_ldo1_ops,
127
128 .vsel_reg = ARIZONA_LDO1_CONTROL_1,
129 .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
130 .min_uV = 900000,
131 .uV_step = 25000,
132 .n_voltages = 13,
133 .enable_time = 500,
134 .ramp_delay = 24000,
135
136 .owner = THIS_MODULE,
137};
138
139static const struct regulator_init_data arizona_ldo1_dvfs = {
140 .constraints = {
141 .min_uV = 1200000,
142 .max_uV = 1800000,
143 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
144 REGULATOR_CHANGE_VOLTAGE,
145 },
146 .num_consumer_supplies = 1,
147};
148
149static const struct regulator_init_data arizona_ldo1_default = {
150 .constraints = {
151 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
152 },
153 .num_consumer_supplies = 1,
154};
155
156static const struct regulator_init_data arizona_ldo1_wm5110 = {
157 .constraints = {
158 .min_uV = 1175000,
159 .max_uV = 1200000,
160 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
161 REGULATOR_CHANGE_VOLTAGE,
162 },
163 .num_consumer_supplies = 1,
164};
165
166static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
167 struct regulator_config *config,
168 const struct regulator_desc *desc,
169 bool *external_dcvdd)
170{
171 struct arizona_ldo1 *ldo1 = config->driver_data;
172 struct device_node *np = config->dev->of_node;
173 struct device_node *init_node, *dcvdd_node;
174 struct regulator_init_data *init_data;
175
176 init_node = of_get_child_by_name(np, "ldo1");
177 dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
178
179 if (init_node) {
180 config->of_node = init_node;
181
182 init_data = of_get_regulator_init_data(config->dev, init_node,
183 desc);
184 if (init_data) {
185 init_data->consumer_supplies = &ldo1->supply;
186 init_data->num_consumer_supplies = 1;
187
188 if (dcvdd_node && dcvdd_node != init_node)
189 *external_dcvdd = true;
190
191 pdata->init_data = init_data;
192 }
193 } else if (dcvdd_node) {
194 *external_dcvdd = true;
195 }
196
197 of_node_put(dcvdd_node);
198
199 return 0;
200}
201
202static int arizona_ldo1_common_init(struct platform_device *pdev,
203 struct arizona_ldo1 *ldo1,
204 const struct regulator_desc *desc,
205 struct arizona_ldo1_pdata *pdata,
206 bool *external_dcvdd)
207{
208 struct device *parent_dev = pdev->dev.parent;
209 struct regulator_config config = { };
210 int ret;
211
212 *external_dcvdd = false;
213
214 ldo1->supply.supply = "DCVDD";
215 ldo1->init_data.consumer_supplies = &ldo1->supply;
216 ldo1->supply.dev_name = dev_name(parent_dev);
217
218 config.dev = parent_dev;
219 config.driver_data = ldo1;
220 config.regmap = ldo1->regmap;
221
222 if (IS_ENABLED(CONFIG_OF)) {
223 if (!dev_get_platdata(parent_dev)) {
224 ret = arizona_ldo1_of_get_pdata(pdata,
225 &config, desc,
226 external_dcvdd);
227 if (ret < 0)
228 return ret;
229 }
230 }
231
232 /* We assume that high output = regulator off
233 * Don't use devm, since we need to get against the parent device
234 * so clean up would happen at the wrong time
235 */
236 config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
237 GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
238 if (IS_ERR(config.ena_gpiod))
239 return PTR_ERR(config.ena_gpiod);
240
241 ldo1->ena_gpiod = config.ena_gpiod;
242
243 if (pdata->init_data)
244 config.init_data = pdata->init_data;
245 else
246 config.init_data = &ldo1->init_data;
247
248 /*
249 * LDO1 can only be used to supply DCVDD so if it has no
250 * consumers then DCVDD is supplied externally.
251 */
252 if (config.init_data->num_consumer_supplies == 0)
253 *external_dcvdd = true;
254
255 ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
256
257 of_node_put(config.of_node);
258
259 if (IS_ERR(ldo1->regulator)) {
260 ret = PTR_ERR(ldo1->regulator);
261 dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
262 ret);
263 return ret;
264 }
265
266 platform_set_drvdata(pdev, ldo1);
267
268 return 0;
269}
270
271static int arizona_ldo1_probe(struct platform_device *pdev)
272{
273 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
274 struct arizona_ldo1 *ldo1;
275 const struct regulator_desc *desc;
276 bool external_dcvdd;
277 int ret;
278
279 ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
280 if (!ldo1)
281 return -ENOMEM;
282
283 ldo1->regmap = arizona->regmap;
284
285 /*
286 * Since the chip usually supplies itself we provide some
287 * default init_data for it. This will be overridden with
288 * platform data if provided.
289 */
290 switch (arizona->type) {
291 case WM5102:
292 case WM8997:
293 case WM8998:
294 case WM1814:
295 desc = &arizona_ldo1_hc;
296 ldo1->init_data = arizona_ldo1_dvfs;
297 break;
298 case WM5110:
299 case WM8280:
300 desc = &arizona_ldo1;
301 ldo1->init_data = arizona_ldo1_wm5110;
302 break;
303 default:
304 desc = &arizona_ldo1;
305 ldo1->init_data = arizona_ldo1_default;
306 break;
307 }
308
309 ret = arizona_ldo1_common_init(pdev, ldo1, desc,
310 &arizona->pdata.ldo1,
311 &external_dcvdd);
312 if (ret == 0)
313 arizona->external_dcvdd = external_dcvdd;
314
315 return ret;
316}
317
318static int arizona_ldo1_remove(struct platform_device *pdev)
319{
320 struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
321
322 if (ldo1->ena_gpiod)
323 gpiod_put(ldo1->ena_gpiod);
324
325 return 0;
326}
327
328static struct platform_driver arizona_ldo1_driver = {
329 .probe = arizona_ldo1_probe,
330 .remove = arizona_ldo1_remove,
331 .driver = {
332 .name = "arizona-ldo1",
333 },
334};
335
336module_platform_driver(arizona_ldo1_driver);
337
338/* Module information */
339MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
340MODULE_DESCRIPTION("Arizona LDO1 driver");
341MODULE_LICENSE("GPL");
342MODULE_ALIAS("platform:arizona-ldo1");
343