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 		.owner = THIS_MODULE,
86 	},
87 	{
88 		.name = "LDO2",
89 		.id = 2,
90 		.type = REGULATOR_VOLTAGE,
91 		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
92 		.vsel_reg = WM8994_LDO_2,
93 		.vsel_mask = WM8994_LDO2_VSEL_MASK,
94 		.ops = &wm8994_ldo2_ops,
95 		.enable_time = 3000,
96 		.owner = THIS_MODULE,
97 	},
98 };
99 
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 
wm8994_ldo_probe(struct platform_device * pdev)120 static int wm8994_ldo_probe(struct platform_device *pdev)
121 {
122 	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
123 	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
124 	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
125 	struct regulator_config config = { };
126 	struct wm8994_ldo *ldo;
127 	struct gpio_desc *gpiod;
128 	int ret;
129 
130 	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
131 
132 	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
133 	if (!ldo)
134 		return -ENOMEM;
135 
136 	ldo->wm8994 = wm8994;
137 	ldo->supply = wm8994_ldo_consumer[id];
138 	ldo->supply.dev_name = dev_name(wm8994->dev);
139 
140 	config.dev = wm8994->dev;
141 	config.driver_data = ldo;
142 	config.regmap = wm8994->regmap;
143 	config.init_data = &ldo->init_data;
144 
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);
153 	if (IS_ERR(gpiod))
154 		return PTR_ERR(gpiod);
155 	config.ena_gpiod = gpiod;
156 
157 	/* Use default constraints if none set up */
158 	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
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;
164 		if (!gpiod)
165 			ldo->init_data.constraints.valid_ops_mask = 0;
166 	} else {
167 		ldo->init_data = *pdata->ldo[id].init_data;
168 	}
169 
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 	 */
175 	ldo->regulator = devm_regulator_register(&pdev->dev,
176 						 &wm8994_ldo_desc[id],
177 						 &config);
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);
182 		return ret;
183 	}
184 
185 	platform_set_drvdata(pdev, ldo);
186 
187 	return 0;
188 }
189 
190 static struct platform_driver wm8994_ldo_driver = {
191 	.probe = wm8994_ldo_probe,
192 	.driver		= {
193 		.name	= "wm8994-ldo",
194 	},
195 };
196 
197 module_platform_driver(wm8994_ldo_driver);
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");
204