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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
33
34
35
36
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 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
97static 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
107static 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
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
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 = ®s[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
