1/*
2 * Regulator support for WM8400
3 *
4 * Copyright 2008 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
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 */
14
15#include <linux/bug.h>
16#include <linux/err.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/regulator/driver.h>
20#include <linux/mfd/wm8400-private.h>
21
22static const struct regulator_linear_range wm8400_ldo_ranges[] = {
23	REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
24	REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
25};
26
27static struct regulator_ops wm8400_ldo_ops = {
28	.is_enabled = regulator_is_enabled_regmap,
29	.enable = regulator_enable_regmap,
30	.disable = regulator_disable_regmap,
31	.list_voltage = regulator_list_voltage_linear_range,
32	.get_voltage_sel = regulator_get_voltage_sel_regmap,
33	.set_voltage_sel = regulator_set_voltage_sel_regmap,
34	.map_voltage = regulator_map_voltage_linear_range,
35};
36
37static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
38{
39	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
40	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
41	u16 data[2];
42	int ret;
43
44	ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
45				data);
46	if (ret != 0)
47		return 0;
48
49	/* Datasheet: hibernate */
50	if (data[0] & WM8400_DC1_SLEEP)
51		return REGULATOR_MODE_STANDBY;
52
53	/* Datasheet: standby */
54	if (!(data[0] & WM8400_DC1_ACTIVE))
55		return REGULATOR_MODE_IDLE;
56
57	/* Datasheet: active with or without force PWM */
58	if (data[1] & WM8400_DC1_FRC_PWM)
59		return REGULATOR_MODE_FAST;
60	else
61		return REGULATOR_MODE_NORMAL;
62}
63
64static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
65{
66	struct wm8400 *wm8400 = rdev_get_drvdata(dev);
67	int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
68	int ret;
69
70	switch (mode) {
71	case REGULATOR_MODE_FAST:
72		/* Datasheet: active with force PWM */
73		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
74				      WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
75		if (ret != 0)
76			return ret;
77
78		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
79				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
80				       WM8400_DC1_ACTIVE);
81
82	case REGULATOR_MODE_NORMAL:
83		/* Datasheet: active */
84		ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
85				      WM8400_DC1_FRC_PWM, 0);
86		if (ret != 0)
87			return ret;
88
89		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
90				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
91				       WM8400_DC1_ACTIVE);
92
93	case REGULATOR_MODE_IDLE:
94		/* Datasheet: standby */
95		return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
96				       WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
97	default:
98		return -EINVAL;
99	}
100}
101
102static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
103						 int input_uV, int output_uV,
104						 int load_uA)
105{
106	return REGULATOR_MODE_NORMAL;
107}
108
109static struct regulator_ops wm8400_dcdc_ops = {
110	.is_enabled = regulator_is_enabled_regmap,
111	.enable = regulator_enable_regmap,
112	.disable = regulator_disable_regmap,
113	.list_voltage = regulator_list_voltage_linear,
114	.map_voltage = regulator_map_voltage_linear,
115	.get_voltage_sel = regulator_get_voltage_sel_regmap,
116	.set_voltage_sel = regulator_set_voltage_sel_regmap,
117	.get_mode = wm8400_dcdc_get_mode,
118	.set_mode = wm8400_dcdc_set_mode,
119	.get_optimum_mode = wm8400_dcdc_get_optimum_mode,
120};
121
122static struct regulator_desc regulators[] = {
123	{
124		.name = "LDO1",
125		.id = WM8400_LDO1,
126		.ops = &wm8400_ldo_ops,
127		.enable_reg = WM8400_LDO1_CONTROL,
128		.enable_mask = WM8400_LDO1_ENA,
129		.n_voltages = WM8400_LDO1_VSEL_MASK + 1,
130		.linear_ranges = wm8400_ldo_ranges,
131		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
132		.vsel_reg = WM8400_LDO1_CONTROL,
133		.vsel_mask = WM8400_LDO1_VSEL_MASK,
134		.type = REGULATOR_VOLTAGE,
135		.owner = THIS_MODULE,
136	},
137	{
138		.name = "LDO2",
139		.id = WM8400_LDO2,
140		.ops = &wm8400_ldo_ops,
141		.enable_reg = WM8400_LDO2_CONTROL,
142		.enable_mask = WM8400_LDO2_ENA,
143		.n_voltages = WM8400_LDO2_VSEL_MASK + 1,
144		.linear_ranges = wm8400_ldo_ranges,
145		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
146		.type = REGULATOR_VOLTAGE,
147		.vsel_reg = WM8400_LDO2_CONTROL,
148		.vsel_mask = WM8400_LDO2_VSEL_MASK,
149		.owner = THIS_MODULE,
150	},
151	{
152		.name = "LDO3",
153		.id = WM8400_LDO3,
154		.ops = &wm8400_ldo_ops,
155		.enable_reg = WM8400_LDO3_CONTROL,
156		.enable_mask = WM8400_LDO3_ENA,
157		.n_voltages = WM8400_LDO3_VSEL_MASK + 1,
158		.linear_ranges = wm8400_ldo_ranges,
159		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
160		.vsel_reg = WM8400_LDO3_CONTROL,
161		.vsel_mask = WM8400_LDO3_VSEL_MASK,
162		.type = REGULATOR_VOLTAGE,
163		.owner = THIS_MODULE,
164	},
165	{
166		.name = "LDO4",
167		.id = WM8400_LDO4,
168		.ops = &wm8400_ldo_ops,
169		.enable_reg = WM8400_LDO4_CONTROL,
170		.enable_mask = WM8400_LDO4_ENA,
171		.n_voltages = WM8400_LDO4_VSEL_MASK + 1,
172		.linear_ranges = wm8400_ldo_ranges,
173		.n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
174		.vsel_reg = WM8400_LDO4_CONTROL,
175		.vsel_mask = WM8400_LDO4_VSEL_MASK,
176		.type = REGULATOR_VOLTAGE,
177		.owner = THIS_MODULE,
178	},
179	{
180		.name = "DCDC1",
181		.id = WM8400_DCDC1,
182		.ops = &wm8400_dcdc_ops,
183		.enable_reg = WM8400_DCDC1_CONTROL_1,
184		.enable_mask = WM8400_DC1_ENA_MASK,
185		.n_voltages = WM8400_DC1_VSEL_MASK + 1,
186		.vsel_reg = WM8400_DCDC1_CONTROL_1,
187		.vsel_mask = WM8400_DC1_VSEL_MASK,
188		.min_uV = 850000,
189		.uV_step = 25000,
190		.type = REGULATOR_VOLTAGE,
191		.owner = THIS_MODULE,
192	},
193	{
194		.name = "DCDC2",
195		.id = WM8400_DCDC2,
196		.ops = &wm8400_dcdc_ops,
197		.enable_reg = WM8400_DCDC2_CONTROL_1,
198		.enable_mask = WM8400_DC1_ENA_MASK,
199		.n_voltages = WM8400_DC2_VSEL_MASK + 1,
200		.vsel_reg = WM8400_DCDC2_CONTROL_1,
201		.vsel_mask = WM8400_DC2_VSEL_MASK,
202		.min_uV = 850000,
203		.uV_step = 25000,
204		.type = REGULATOR_VOLTAGE,
205		.owner = THIS_MODULE,
206	},
207};
208
209static int wm8400_regulator_probe(struct platform_device *pdev)
210{
211	struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
212	struct regulator_config config = { };
213	struct regulator_dev *rdev;
214
215	config.dev = &pdev->dev;
216	config.init_data = dev_get_platdata(&pdev->dev);
217	config.driver_data = wm8400;
218	config.regmap = wm8400->regmap;
219
220	rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
221				       &config);
222	if (IS_ERR(rdev))
223		return PTR_ERR(rdev);
224
225	platform_set_drvdata(pdev, rdev);
226
227	return 0;
228}
229
230static struct platform_driver wm8400_regulator_driver = {
231	.driver = {
232		.name = "wm8400-regulator",
233	},
234	.probe = wm8400_regulator_probe,
235};
236
237/**
238 * wm8400_register_regulator - enable software control of a WM8400 regulator
239 *
240 * This function enables software control of a WM8400 regulator via
241 * the regulator API.  It is intended to be called from the
242 * platform_init() callback of the WM8400 MFD driver.
243 *
244 * @param dev      The WM8400 device to operate on.
245 * @param reg      The regulator to control.
246 * @param initdata Regulator initdata for the regulator.
247 */
248int wm8400_register_regulator(struct device *dev, int reg,
249			      struct regulator_init_data *initdata)
250{
251	struct wm8400 *wm8400 = dev_get_drvdata(dev);
252
253	if (wm8400->regulators[reg].name)
254		return -EBUSY;
255
256	initdata->driver_data = wm8400;
257
258	wm8400->regulators[reg].name = "wm8400-regulator";
259	wm8400->regulators[reg].id = reg;
260	wm8400->regulators[reg].dev.parent = dev;
261	wm8400->regulators[reg].dev.platform_data = initdata;
262
263	return platform_device_register(&wm8400->regulators[reg]);
264}
265EXPORT_SYMBOL_GPL(wm8400_register_regulator);
266
267static int __init wm8400_regulator_init(void)
268{
269	return platform_driver_register(&wm8400_regulator_driver);
270}
271subsys_initcall(wm8400_regulator_init);
272
273static void __exit wm8400_regulator_exit(void)
274{
275	platform_driver_unregister(&wm8400_regulator_driver);
276}
277module_exit(wm8400_regulator_exit);
278
279MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
280MODULE_DESCRIPTION("WM8400 regulator driver");
281MODULE_LICENSE("GPL");
282MODULE_ALIAS("platform:wm8400-regulator");
283