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
24struct 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
34static 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
41static 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
67static 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
73static 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
102static 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
129static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
130	{ .supply = "AVDD1" },
131	{ .supply = "DCVDD" },
132};
133
134static 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
149static int wm8994_ldo_probe(struct platform_device *pdev)
150{
151	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
152	struct wm8994_pdata *pdata = dev_get_platdata(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(&pdev->dev, 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(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(pdev->dev.parent,
179				   id ? "wlf,ldo2ena" : "wlf,ldo1ena",
180				   GPIOD_OUT_LOW |
181				   GPIOD_FLAGS_BIT_NONEXCLUSIVE);
182	if (IS_ERR(gpiod))
183		return PTR_ERR(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(&pdev->dev,
206							 &wm8994_ldo_desc[id],
207							 &config);
208	} else {
209		ldo->regulator = devm_regulator_register(&pdev->dev,
210							 &wm8958_ldo_desc[id],
211							 &config);
212	}
213
214	if (IS_ERR(ldo->regulator)) {
215		ret = PTR_ERR(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, ldo);
222
223	return 0;
224}
225
226static 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
234module_platform_driver(wm8994_ldo_driver);
235
236/* Module information */
237MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
238MODULE_DESCRIPTION("WM8994 LDO driver");
239MODULE_LICENSE("GPL");
240MODULE_ALIAS("platform:wm8994-ldo");
241