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e8d59d9a AL |
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> | |
69dc16c3 MB |
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> | |
e3d27775 | 16 | #include <linux/regulator/machine.h> |
1d2f4681 | 17 | #include <linux/gpio/consumer.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
69dc16c3 MB |
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 { | |
69dc16c3 MB |
25 | struct regulator_dev *regulator; |
26 | struct wm8994 *wm8994; | |
e3d27775 MB |
27 | struct regulator_consumer_supply supply; |
28 | struct regulator_init_data init_data; | |
69dc16c3 MB |
29 | }; |
30 | ||
31 | #define WM8994_LDO1_MAX_SELECTOR 0x7 | |
32 | #define WM8994_LDO2_MAX_SELECTOR 0x3 | |
33 | ||
b0d6dd3b | 34 | static const struct regulator_ops wm8994_ldo1_ops = { |
f2d103ad AL |
35 | .list_voltage = regulator_list_voltage_linear, |
36 | .map_voltage = regulator_map_voltage_linear, | |
633b6fcd MB |
37 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
38 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
69dc16c3 MB |
39 | }; |
40 | ||
41 | static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, | |
42 | unsigned int selector) | |
43 | { | |
5a7743ed MB |
44 | struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); |
45 | ||
69dc16c3 MB |
46 | if (selector > WM8994_LDO2_MAX_SELECTOR) |
47 | return -EINVAL; | |
48 | ||
5a7743ed MB |
49 | switch (ldo->wm8994->type) { |
50 | case WM8994: | |
51 | return (selector * 100000) + 900000; | |
52 | case WM8958: | |
53 | return (selector * 100000) + 1000000; | |
a1ff89ef MB |
54 | case WM1811: |
55 | switch (selector) { | |
56 | case 0: | |
57 | return -EINVAL; | |
58 | default: | |
59 | return (selector * 100000) + 950000; | |
60 | } | |
61 | break; | |
5a7743ed MB |
62 | default: |
63 | return -EINVAL; | |
64 | } | |
69dc16c3 MB |
65 | } |
66 | ||
b0d6dd3b | 67 | static const struct regulator_ops wm8994_ldo2_ops = { |
69dc16c3 | 68 | .list_voltage = wm8994_ldo2_list_voltage, |
633b6fcd MB |
69 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
70 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
69dc16c3 MB |
71 | }; |
72 | ||
25e4d602 | 73 | static const struct regulator_desc wm8994_ldo_desc[] = { |
69dc16c3 MB |
74 | { |
75 | .name = "LDO1", | |
76 | .id = 1, | |
77 | .type = REGULATOR_VOLTAGE, | |
78 | .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, | |
633b6fcd MB |
79 | .vsel_reg = WM8994_LDO_1, |
80 | .vsel_mask = WM8994_LDO1_VSEL_MASK, | |
69dc16c3 | 81 | .ops = &wm8994_ldo1_ops, |
f2d103ad AL |
82 | .min_uV = 2400000, |
83 | .uV_step = 100000, | |
00581b30 | 84 | .enable_time = 3000, |
69dc16c3 MB |
85 | .owner = THIS_MODULE, |
86 | }, | |
87 | { | |
88 | .name = "LDO2", | |
89 | .id = 2, | |
90 | .type = REGULATOR_VOLTAGE, | |
91 | .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, | |
633b6fcd MB |
92 | .vsel_reg = WM8994_LDO_2, |
93 | .vsel_mask = WM8994_LDO2_VSEL_MASK, | |
69dc16c3 | 94 | .ops = &wm8994_ldo2_ops, |
00581b30 | 95 | .enable_time = 3000, |
69dc16c3 MB |
96 | .owner = THIS_MODULE, |
97 | }, | |
98 | }; | |
99 | ||
e3d27775 MB |
100 | static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { |
101 | { .supply = "AVDD1" }, | |
102 | { .supply = "DCVDD" }, | |
103 | }; | |
104 | ||
105 | static const struct regulator_init_data wm8994_ldo_default[] = { | |
106 | { | |
107 | .constraints = { | |
108 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, | |
109 | }, | |
110 | .num_consumer_supplies = 1, | |
111 | }, | |
112 | { | |
113 | .constraints = { | |
114 | .valid_ops_mask = REGULATOR_CHANGE_STATUS, | |
115 | }, | |
116 | .num_consumer_supplies = 1, | |
117 | }, | |
118 | }; | |
119 | ||
a5023574 | 120 | static int wm8994_ldo_probe(struct platform_device *pdev) |
69dc16c3 MB |
121 | { |
122 | struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); | |
dff91d0b | 123 | struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
69dc16c3 | 124 | int id = pdev->id % ARRAY_SIZE(pdata->ldo); |
c172708d | 125 | struct regulator_config config = { }; |
69dc16c3 | 126 | struct wm8994_ldo *ldo; |
1d2f4681 | 127 | struct gpio_desc *gpiod; |
69dc16c3 MB |
128 | int ret; |
129 | ||
130 | dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); | |
131 | ||
b9e0348f | 132 | ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); |
4deaf85a | 133 | if (!ldo) |
69dc16c3 | 134 | return -ENOMEM; |
69dc16c3 MB |
135 | |
136 | ldo->wm8994 = wm8994; | |
e3d27775 MB |
137 | ldo->supply = wm8994_ldo_consumer[id]; |
138 | ldo->supply.dev_name = dev_name(wm8994->dev); | |
69dc16c3 | 139 | |
5d0526ea | 140 | config.dev = wm8994->dev; |
c172708d | 141 | config.driver_data = ldo; |
633b6fcd | 142 | config.regmap = wm8994->regmap; |
e3d27775 | 143 | config.init_data = &ldo->init_data; |
1d2f4681 | 144 | |
466affa0 CK |
145 | /* |
146 | * Look up LDO enable GPIO from the parent device node, we don't | |
147 | * use devm because the regulator core will free the GPIO | |
148 | */ | |
149 | gpiod = gpiod_get_optional(pdev->dev.parent, | |
150 | id ? "wlf,ldo2ena" : "wlf,ldo1ena", | |
151 | GPIOD_OUT_LOW | | |
152 | GPIOD_FLAGS_BIT_NONEXCLUSIVE); | |
1d2f4681 LW |
153 | if (IS_ERR(gpiod)) |
154 | return PTR_ERR(gpiod); | |
155 | config.ena_gpiod = gpiod; | |
e3d27775 MB |
156 | |
157 | /* Use default constraints if none set up */ | |
3ea93896 | 158 | if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { |
e3d27775 MB |
159 | dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", |
160 | ldo->supply.dev_name, ldo->supply.supply); | |
161 | ||
162 | ldo->init_data = wm8994_ldo_default[id]; | |
163 | ldo->init_data.consumer_supplies = &ldo->supply; | |
1d2f4681 | 164 | if (!gpiod) |
e3d27775 MB |
165 | ldo->init_data.constraints.valid_ops_mask = 0; |
166 | } else { | |
167 | ldo->init_data = *pdata->ldo[id].init_data; | |
495fd8c8 | 168 | } |
c172708d | 169 | |
daa531db LW |
170 | /* |
171 | * At this point the GPIO descriptor is handled over to the | |
172 | * regulator core and we need not worry about it on the | |
173 | * error path. | |
174 | */ | |
9e2bfbbd MB |
175 | ldo->regulator = devm_regulator_register(&pdev->dev, |
176 | &wm8994_ldo_desc[id], | |
177 | &config); | |
69dc16c3 MB |
178 | if (IS_ERR(ldo->regulator)) { |
179 | ret = PTR_ERR(ldo->regulator); | |
180 | dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", | |
181 | id + 1, ret); | |
daa531db | 182 | return ret; |
69dc16c3 MB |
183 | } |
184 | ||
185 | platform_set_drvdata(pdev, ldo); | |
186 | ||
187 | return 0; | |
69dc16c3 MB |
188 | } |
189 | ||
69dc16c3 MB |
190 | static struct platform_driver wm8994_ldo_driver = { |
191 | .probe = wm8994_ldo_probe, | |
69dc16c3 MB |
192 | .driver = { |
193 | .name = "wm8994-ldo", | |
194 | }, | |
195 | }; | |
196 | ||
05650216 | 197 | module_platform_driver(wm8994_ldo_driver); |
69dc16c3 MB |
198 | |
199 | /* Module information */ | |
200 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
201 | MODULE_DESCRIPTION("WM8994 LDO driver"); | |
202 | MODULE_LICENSE("GPL"); | |
203 | MODULE_ALIAS("platform:wm8994-ldo"); |