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 | |
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 | |
149 | static int wm8994_ldo_probe(struct platform_device *pdev) |
150 | { |
151 | struct wm8994 *wm8994 = dev_get_drvdata(dev: pdev->dev.parent); |
152 | struct wm8994_pdata *pdata = dev_get_platdata(dev: 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(dev: &pdev->dev, size: 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(dev: 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(dev: pdev->dev.parent, |
179 | con_id: id ? "wlf,ldo2ena" : "wlf,ldo1ena" , |
180 | flags: GPIOD_OUT_LOW | |
181 | GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
182 | if (IS_ERR(ptr: gpiod)) |
183 | return PTR_ERR(ptr: 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(dev: &pdev->dev, |
206 | regulator_desc: &wm8994_ldo_desc[id], |
207 | config: &config); |
208 | } else { |
209 | ldo->regulator = devm_regulator_register(dev: &pdev->dev, |
210 | regulator_desc: &wm8958_ldo_desc[id], |
211 | config: &config); |
212 | } |
213 | |
214 | if (IS_ERR(ptr: ldo->regulator)) { |
215 | ret = PTR_ERR(ptr: 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, data: 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 | |