1 /*
2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
3  *
4  * Copyright 2012 Wolfson Microelectronics PLC.
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
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/of.h>
20 #include <linux/gpio/consumer.h>
21 #include <linux/platform_device.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/regulator/of_regulator.h>
25 #include <linux/slab.h>
26 
27 #include <linux/regulator/arizona-ldo1.h>
28 
29 #include <linux/mfd/arizona/core.h>
30 #include <linux/mfd/arizona/pdata.h>
31 #include <linux/mfd/arizona/registers.h>
32 
33 struct arizona_ldo1 {
34 	struct regulator_dev *regulator;
35 	struct regmap *regmap;
36 
37 	struct regulator_consumer_supply supply;
38 	struct regulator_init_data init_data;
39 
40 	struct gpio_desc *ena_gpiod;
41 };
42 
43 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
44 					   unsigned sel)
45 {
46 	struct regmap *regmap = rdev_get_regmap(rdev);
47 	unsigned int val;
48 	int ret;
49 
50 	if (sel == rdev->desc->n_voltages - 1)
51 		val = ARIZONA_LDO1_HI_PWR;
52 	else
53 		val = 0;
54 
55 	ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
56 				 ARIZONA_LDO1_HI_PWR, val);
57 	if (ret != 0)
58 		return ret;
59 
60 	if (val)
61 		return 0;
62 
63 	return regulator_set_voltage_sel_regmap(rdev, sel);
64 }
65 
66 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
67 {
68 	struct regmap *regmap = rdev_get_regmap(rdev);
69 	unsigned int val;
70 	int ret;
71 
72 	ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
73 	if (ret != 0)
74 		return ret;
75 
76 	if (val & ARIZONA_LDO1_HI_PWR)
77 		return rdev->desc->n_voltages - 1;
78 
79 	return regulator_get_voltage_sel_regmap(rdev);
80 }
81 
82 static const struct regulator_ops arizona_ldo1_hc_ops = {
83 	.list_voltage = regulator_list_voltage_linear_range,
84 	.map_voltage = regulator_map_voltage_linear_range,
85 	.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
86 	.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
87 	.get_bypass = regulator_get_bypass_regmap,
88 	.set_bypass = regulator_set_bypass_regmap,
89 };
90 
91 static const struct regulator_linear_range arizona_ldo1_hc_ranges[] = {
92 	REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
93 	REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
94 };
95 
96 static const struct regulator_desc arizona_ldo1_hc = {
97 	.name = "LDO1",
98 	.supply_name = "LDOVDD",
99 	.type = REGULATOR_VOLTAGE,
100 	.ops = &arizona_ldo1_hc_ops,
101 
102 	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
103 	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
104 	.bypass_reg = ARIZONA_LDO1_CONTROL_1,
105 	.bypass_mask = ARIZONA_LDO1_BYPASS,
106 	.linear_ranges = arizona_ldo1_hc_ranges,
107 	.n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
108 	.n_voltages = 8,
109 	.enable_time = 1500,
110 	.ramp_delay = 24000,
111 
112 	.owner = THIS_MODULE,
113 };
114 
115 static const struct regulator_ops arizona_ldo1_ops = {
116 	.list_voltage = regulator_list_voltage_linear,
117 	.map_voltage = regulator_map_voltage_linear,
118 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
119 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
120 };
121 
122 static const struct regulator_desc arizona_ldo1 = {
123 	.name = "LDO1",
124 	.supply_name = "LDOVDD",
125 	.type = REGULATOR_VOLTAGE,
126 	.ops = &arizona_ldo1_ops,
127 
128 	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
129 	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
130 	.min_uV = 900000,
131 	.uV_step = 25000,
132 	.n_voltages = 13,
133 	.enable_time = 500,
134 	.ramp_delay = 24000,
135 
136 	.owner = THIS_MODULE,
137 };
138 
139 static const struct regulator_init_data arizona_ldo1_dvfs = {
140 	.constraints = {
141 		.min_uV = 1200000,
142 		.max_uV = 1800000,
143 		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
144 				  REGULATOR_CHANGE_VOLTAGE,
145 	},
146 	.num_consumer_supplies = 1,
147 };
148 
149 static const struct regulator_init_data arizona_ldo1_default = {
150 	.constraints = {
151 		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
152 	},
153 	.num_consumer_supplies = 1,
154 };
155 
156 static const struct regulator_init_data arizona_ldo1_wm5110 = {
157 	.constraints = {
158 		.min_uV = 1175000,
159 		.max_uV = 1200000,
160 		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
161 				  REGULATOR_CHANGE_VOLTAGE,
162 	},
163 	.num_consumer_supplies = 1,
164 };
165 
166 static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
167 				     struct regulator_config *config,
168 				     const struct regulator_desc *desc,
169 				     bool *external_dcvdd)
170 {
171 	struct arizona_ldo1 *ldo1 = config->driver_data;
172 	struct device_node *np = config->dev->of_node;
173 	struct device_node *init_node, *dcvdd_node;
174 	struct regulator_init_data *init_data;
175 
176 	init_node = of_get_child_by_name(np, "ldo1");
177 	dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
178 
179 	if (init_node) {
180 		config->of_node = init_node;
181 
182 		init_data = of_get_regulator_init_data(config->dev, init_node,
183 						       desc);
184 		if (init_data) {
185 			init_data->consumer_supplies = &ldo1->supply;
186 			init_data->num_consumer_supplies = 1;
187 
188 			if (dcvdd_node && dcvdd_node != init_node)
189 				*external_dcvdd = true;
190 
191 			pdata->init_data = init_data;
192 		}
193 	} else if (dcvdd_node) {
194 		*external_dcvdd = true;
195 	}
196 
197 	of_node_put(dcvdd_node);
198 
199 	return 0;
200 }
201 
202 static int arizona_ldo1_common_init(struct platform_device *pdev,
203 				    struct arizona_ldo1 *ldo1,
204 				    const struct regulator_desc *desc,
205 				    struct arizona_ldo1_pdata *pdata,
206 				    bool *external_dcvdd)
207 {
208 	struct device *parent_dev = pdev->dev.parent;
209 	struct regulator_config config = { };
210 	int ret;
211 
212 	*external_dcvdd = false;
213 
214 	ldo1->supply.supply = "DCVDD";
215 	ldo1->init_data.consumer_supplies = &ldo1->supply;
216 	ldo1->supply.dev_name = dev_name(parent_dev);
217 
218 	config.dev = parent_dev;
219 	config.driver_data = ldo1;
220 	config.regmap = ldo1->regmap;
221 
222 	if (IS_ENABLED(CONFIG_OF)) {
223 		if (!dev_get_platdata(parent_dev)) {
224 			ret = arizona_ldo1_of_get_pdata(pdata,
225 							&config, desc,
226 							external_dcvdd);
227 			if (ret < 0)
228 				return ret;
229 		}
230 	}
231 
232 	/* We assume that high output = regulator off
233 	 * Don't use devm, since we need to get against the parent device
234 	 * so clean up would happen at the wrong time
235 	 */
236 	config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
237 				GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
238 	if (IS_ERR(config.ena_gpiod))
239 		return PTR_ERR(config.ena_gpiod);
240 
241 	ldo1->ena_gpiod = config.ena_gpiod;
242 
243 	if (pdata->init_data)
244 		config.init_data = pdata->init_data;
245 	else
246 		config.init_data = &ldo1->init_data;
247 
248 	/*
249 	 * LDO1 can only be used to supply DCVDD so if it has no
250 	 * consumers then DCVDD is supplied externally.
251 	 */
252 	if (config.init_data->num_consumer_supplies == 0)
253 		*external_dcvdd = true;
254 
255 	ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
256 
257 	of_node_put(config.of_node);
258 
259 	if (IS_ERR(ldo1->regulator)) {
260 		ret = PTR_ERR(ldo1->regulator);
261 		dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
262 			ret);
263 		return ret;
264 	}
265 
266 	platform_set_drvdata(pdev, ldo1);
267 
268 	return 0;
269 }
270 
271 static int arizona_ldo1_probe(struct platform_device *pdev)
272 {
273 	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
274 	struct arizona_ldo1 *ldo1;
275 	const struct regulator_desc *desc;
276 	bool external_dcvdd;
277 	int ret;
278 
279 	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
280 	if (!ldo1)
281 		return -ENOMEM;
282 
283 	ldo1->regmap = arizona->regmap;
284 
285 	/*
286 	 * Since the chip usually supplies itself we provide some
287 	 * default init_data for it.  This will be overridden with
288 	 * platform data if provided.
289 	 */
290 	switch (arizona->type) {
291 	case WM5102:
292 	case WM8997:
293 	case WM8998:
294 	case WM1814:
295 		desc = &arizona_ldo1_hc;
296 		ldo1->init_data = arizona_ldo1_dvfs;
297 		break;
298 	case WM5110:
299 	case WM8280:
300 		desc = &arizona_ldo1;
301 		ldo1->init_data = arizona_ldo1_wm5110;
302 		break;
303 	default:
304 		desc = &arizona_ldo1;
305 		ldo1->init_data = arizona_ldo1_default;
306 		break;
307 	}
308 
309 	ret = arizona_ldo1_common_init(pdev, ldo1, desc,
310 				       &arizona->pdata.ldo1,
311 				       &external_dcvdd);
312 	if (ret == 0)
313 		arizona->external_dcvdd = external_dcvdd;
314 
315 	return ret;
316 }
317 
318 static int arizona_ldo1_remove(struct platform_device *pdev)
319 {
320 	struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
321 
322 	if (ldo1->ena_gpiod)
323 		gpiod_put(ldo1->ena_gpiod);
324 
325 	return 0;
326 }
327 
328 static struct platform_driver arizona_ldo1_driver = {
329 	.probe = arizona_ldo1_probe,
330 	.remove = arizona_ldo1_remove,
331 	.driver		= {
332 		.name	= "arizona-ldo1",
333 	},
334 };
335 
336 module_platform_driver(arizona_ldo1_driver);
337 
338 /* Module information */
339 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
340 MODULE_DESCRIPTION("Arizona LDO1 driver");
341 MODULE_LICENSE("GPL");
342 MODULE_ALIAS("platform:arizona-ldo1");
343