1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // wm8994-regulator.c -- Regulator driver for the WM8994
4 //
5 // Copyright 2009 Wolfson Microelectronics PLC.
6 //
7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/bitops.h>
13 #include <linux/err.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/slab.h>
19
20 #include <linux/mfd/wm8994/core.h>
21 #include <linux/mfd/wm8994/registers.h>
22 #include <linux/mfd/wm8994/pdata.h>
23
24 struct wm8994_ldo {
25 struct regulator_dev *regulator;
26 struct wm8994 *wm8994;
27 struct regulator_consumer_supply supply;
28 struct regulator_init_data init_data;
29 };
30
31 #define WM8994_LDO1_MAX_SELECTOR 0x7
32 #define WM8994_LDO2_MAX_SELECTOR 0x3
33
34 static const struct regulator_ops wm8994_ldo1_ops = {
35 .list_voltage = regulator_list_voltage_linear,
36 .map_voltage = regulator_map_voltage_linear,
37 .get_voltage_sel = regulator_get_voltage_sel_regmap,
38 .set_voltage_sel = regulator_set_voltage_sel_regmap,
39 };
40
wm8994_ldo2_list_voltage(struct regulator_dev * rdev,unsigned int selector)41 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
42 unsigned int selector)
43 {
44 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
45
46 if (selector > WM8994_LDO2_MAX_SELECTOR)
47 return -EINVAL;
48
49 switch (ldo->wm8994->type) {
50 case WM8994:
51 return (selector * 100000) + 900000;
52 case WM8958:
53 return (selector * 100000) + 1000000;
54 case WM1811:
55 switch (selector) {
56 case 0:
57 return -EINVAL;
58 default:
59 return (selector * 100000) + 950000;
60 }
61 break;
62 default:
63 return -EINVAL;
64 }
65 }
66
67 static const struct regulator_ops wm8994_ldo2_ops = {
68 .list_voltage = wm8994_ldo2_list_voltage,
69 .get_voltage_sel = regulator_get_voltage_sel_regmap,
70 .set_voltage_sel = regulator_set_voltage_sel_regmap,
71 };
72
73 static const struct regulator_desc wm8994_ldo_desc[] = {
74 {
75 .name = "LDO1",
76 .id = 1,
77 .type = REGULATOR_VOLTAGE,
78 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
79 .vsel_reg = WM8994_LDO_1,
80 .vsel_mask = WM8994_LDO1_VSEL_MASK,
81 .ops = &wm8994_ldo1_ops,
82 .min_uV = 2400000,
83 .uV_step = 100000,
84 .enable_time = 3000,
85 .off_on_delay = 36000,
86 .owner = THIS_MODULE,
87 },
88 {
89 .name = "LDO2",
90 .id = 2,
91 .type = REGULATOR_VOLTAGE,
92 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
93 .vsel_reg = WM8994_LDO_2,
94 .vsel_mask = WM8994_LDO2_VSEL_MASK,
95 .ops = &wm8994_ldo2_ops,
96 .enable_time = 3000,
97 .off_on_delay = 36000,
98 .owner = THIS_MODULE,
99 },
100 };
101
102 static const struct regulator_desc wm8958_ldo_desc[] = {
103 {
104 .name = "LDO1",
105 .id = 1,
106 .type = REGULATOR_VOLTAGE,
107 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
108 .vsel_reg = WM8994_LDO_1,
109 .vsel_mask = WM8994_LDO1_VSEL_MASK,
110 .ops = &wm8994_ldo1_ops,
111 .min_uV = 2400000,
112 .uV_step = 100000,
113 .enable_time = 3000,
114 .owner = THIS_MODULE,
115 },
116 {
117 .name = "LDO2",
118 .id = 2,
119 .type = REGULATOR_VOLTAGE,
120 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
121 .vsel_reg = WM8994_LDO_2,
122 .vsel_mask = WM8994_LDO2_VSEL_MASK,
123 .ops = &wm8994_ldo2_ops,
124 .enable_time = 3000,
125 .owner = THIS_MODULE,
126 },
127 };
128
129 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
130 { .supply = "AVDD1" },
131 { .supply = "DCVDD" },
132 };
133
134 static const struct regulator_init_data wm8994_ldo_default[] = {
135 {
136 .constraints = {
137 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
138 },
139 .num_consumer_supplies = 1,
140 },
141 {
142 .constraints = {
143 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
144 },
145 .num_consumer_supplies = 1,
146 },
147 };
148
wm8994_ldo_probe(struct platform_device * pdev)149 static int wm8994_ldo_probe(struct platform_device *pdev)
150 {
151 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
152 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
153 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
154 struct regulator_config config = { };
155 struct wm8994_ldo *ldo;
156 struct gpio_desc *gpiod;
157 int ret;
158
159 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
160
161 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
162 if (!ldo)
163 return -ENOMEM;
164
165 ldo->wm8994 = wm8994;
166 ldo->supply = wm8994_ldo_consumer[id];
167 ldo->supply.dev_name = dev_name(wm8994->dev);
168
169 config.dev = wm8994->dev;
170 config.driver_data = ldo;
171 config.regmap = wm8994->regmap;
172 config.init_data = &ldo->init_data;
173
174 /*
175 * Look up LDO enable GPIO from the parent device node, we don't
176 * use devm because the regulator core will free the GPIO
177 */
178 gpiod = gpiod_get_optional(pdev->dev.parent,
179 id ? "wlf,ldo2ena" : "wlf,ldo1ena",
180 GPIOD_OUT_LOW |
181 GPIOD_FLAGS_BIT_NONEXCLUSIVE);
182 if (IS_ERR(gpiod))
183 return PTR_ERR(gpiod);
184 config.ena_gpiod = gpiod;
185
186 /* Use default constraints if none set up */
187 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
188 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
189 ldo->supply.dev_name, ldo->supply.supply);
190
191 ldo->init_data = wm8994_ldo_default[id];
192 ldo->init_data.consumer_supplies = &ldo->supply;
193 if (!gpiod)
194 ldo->init_data.constraints.valid_ops_mask = 0;
195 } else {
196 ldo->init_data = *pdata->ldo[id].init_data;
197 }
198
199 /*
200 * At this point the GPIO descriptor is handled over to the
201 * regulator core and we need not worry about it on the
202 * error path.
203 */
204 if (ldo->wm8994->type == WM8994) {
205 ldo->regulator = devm_regulator_register(&pdev->dev,
206 &wm8994_ldo_desc[id],
207 &config);
208 } else {
209 ldo->regulator = devm_regulator_register(&pdev->dev,
210 &wm8958_ldo_desc[id],
211 &config);
212 }
213
214 if (IS_ERR(ldo->regulator)) {
215 ret = PTR_ERR(ldo->regulator);
216 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
217 id + 1, ret);
218 return ret;
219 }
220
221 platform_set_drvdata(pdev, ldo);
222
223 return 0;
224 }
225
226 static struct platform_driver wm8994_ldo_driver = {
227 .probe = wm8994_ldo_probe,
228 .driver = {
229 .name = "wm8994-ldo",
230 .probe_type = PROBE_FORCE_SYNCHRONOUS,
231 },
232 };
233
234 module_platform_driver(wm8994_ldo_driver);
235
236 /* Module information */
237 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
238 MODULE_DESCRIPTION("WM8994 LDO driver");
239 MODULE_LICENSE("GPL");
240 MODULE_ALIAS("platform:wm8994-ldo");
241