1
2
3
4
5
6
7
8
9
10
11
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/platform_device.h>
20#include <linux/regulator/driver.h>
21#include <linux/regulator/machine.h>
22#include <linux/gpio.h>
23#include <linux/slab.h>
24
25#include <linux/mfd/wm8994/core.h>
26#include <linux/mfd/wm8994/registers.h>
27#include <linux/mfd/wm8994/pdata.h>
28
29struct wm8994_ldo {
30 struct regulator_dev *regulator;
31 struct wm8994 *wm8994;
32 struct regulator_consumer_supply supply;
33 struct regulator_init_data init_data;
34};
35
36#define WM8994_LDO1_MAX_SELECTOR 0x7
37#define WM8994_LDO2_MAX_SELECTOR 0x3
38
39static const struct regulator_ops wm8994_ldo1_ops = {
40 .list_voltage = regulator_list_voltage_linear,
41 .map_voltage = regulator_map_voltage_linear,
42 .get_voltage_sel = regulator_get_voltage_sel_regmap,
43 .set_voltage_sel = regulator_set_voltage_sel_regmap,
44};
45
46static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
47 unsigned int selector)
48{
49 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
50
51 if (selector > WM8994_LDO2_MAX_SELECTOR)
52 return -EINVAL;
53
54 switch (ldo->wm8994->type) {
55 case WM8994:
56 return (selector * 100000) + 900000;
57 case WM8958:
58 return (selector * 100000) + 1000000;
59 case WM1811:
60 switch (selector) {
61 case 0:
62 return -EINVAL;
63 default:
64 return (selector * 100000) + 950000;
65 }
66 break;
67 default:
68 return -EINVAL;
69 }
70}
71
72static const struct regulator_ops wm8994_ldo2_ops = {
73 .list_voltage = wm8994_ldo2_list_voltage,
74 .get_voltage_sel = regulator_get_voltage_sel_regmap,
75 .set_voltage_sel = regulator_set_voltage_sel_regmap,
76};
77
78static const struct regulator_desc wm8994_ldo_desc[] = {
79 {
80 .name = "LDO1",
81 .id = 1,
82 .type = REGULATOR_VOLTAGE,
83 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
84 .vsel_reg = WM8994_LDO_1,
85 .vsel_mask = WM8994_LDO1_VSEL_MASK,
86 .ops = &wm8994_ldo1_ops,
87 .min_uV = 2400000,
88 .uV_step = 100000,
89 .enable_time = 3000,
90 .owner = THIS_MODULE,
91 },
92 {
93 .name = "LDO2",
94 .id = 2,
95 .type = REGULATOR_VOLTAGE,
96 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
97 .vsel_reg = WM8994_LDO_2,
98 .vsel_mask = WM8994_LDO2_VSEL_MASK,
99 .ops = &wm8994_ldo2_ops,
100 .enable_time = 3000,
101 .owner = THIS_MODULE,
102 },
103};
104
105static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
106 { .supply = "AVDD1" },
107 { .supply = "DCVDD" },
108};
109
110static const struct regulator_init_data wm8994_ldo_default[] = {
111 {
112 .constraints = {
113 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
114 },
115 .num_consumer_supplies = 1,
116 },
117 {
118 .constraints = {
119 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
120 },
121 .num_consumer_supplies = 1,
122 },
123};
124
125static int wm8994_ldo_probe(struct platform_device *pdev)
126{
127 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
128 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
129 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
130 struct regulator_config config = { };
131 struct wm8994_ldo *ldo;
132 int ret;
133
134 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
135
136 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
137 if (!ldo)
138 return -ENOMEM;
139
140 ldo->wm8994 = wm8994;
141 ldo->supply = wm8994_ldo_consumer[id];
142 ldo->supply.dev_name = dev_name(wm8994->dev);
143
144 config.dev = wm8994->dev;
145 config.driver_data = ldo;
146 config.regmap = wm8994->regmap;
147 config.init_data = &ldo->init_data;
148 if (pdata) {
149 config.ena_gpio = pdata->ldo[id].enable;
150 } else if (wm8994->dev->of_node) {
151 config.ena_gpio = wm8994->pdata.ldo[id].enable;
152 config.ena_gpio_initialized = true;
153 }
154
155
156 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
157 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
158 ldo->supply.dev_name, ldo->supply.supply);
159
160 ldo->init_data = wm8994_ldo_default[id];
161 ldo->init_data.consumer_supplies = &ldo->supply;
162 if (!config.ena_gpio)
163 ldo->init_data.constraints.valid_ops_mask = 0;
164 } else {
165 ldo->init_data = *pdata->ldo[id].init_data;
166 }
167
168 ldo->regulator = devm_regulator_register(&pdev->dev,
169 &wm8994_ldo_desc[id],
170 &config);
171 if (IS_ERR(ldo->regulator)) {
172 ret = PTR_ERR(ldo->regulator);
173 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
174 id + 1, ret);
175 goto err;
176 }
177
178 platform_set_drvdata(pdev, ldo);
179
180 return 0;
181
182err:
183 return ret;
184}
185
186static struct platform_driver wm8994_ldo_driver = {
187 .probe = wm8994_ldo_probe,
188 .driver = {
189 .name = "wm8994-ldo",
190 },
191};
192
193module_platform_driver(wm8994_ldo_driver);
194
195
196MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
197MODULE_DESCRIPTION("WM8994 LDO driver");
198MODULE_LICENSE("GPL");
199MODULE_ALIAS("platform:wm8994-ldo");
200
