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/drivers/regulator/max8649.c

http://github.com/mirrors/linux
C | 272 lines | 219 code | 38 blank | 15 comment | 17 complexity | a2773b799b3be29a43597a3b4d8575dd MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Regulators driver for Maxim max8649
  4 *
  5 * Copyright (C) 2009-2010 Marvell International Ltd.
  6 *      Haojian Zhuang <haojian.zhuang@marvell.com>
  7 */
  8#include <linux/kernel.h>
  9#include <linux/module.h>
 10#include <linux/err.h>
 11#include <linux/i2c.h>
 12#include <linux/platform_device.h>
 13#include <linux/regulator/driver.h>
 14#include <linux/slab.h>
 15#include <linux/regulator/max8649.h>
 16#include <linux/regmap.h>
 17
 18#define MAX8649_DCDC_VMIN	750000		/* uV */
 19#define MAX8649_DCDC_VMAX	1380000		/* uV */
 20#define MAX8649_DCDC_STEP	10000		/* uV */
 21#define MAX8649_VOL_MASK	0x3f
 22
 23/* Registers */
 24#define MAX8649_MODE0		0x00
 25#define MAX8649_MODE1		0x01
 26#define MAX8649_MODE2		0x02
 27#define MAX8649_MODE3		0x03
 28#define MAX8649_CONTROL		0x04
 29#define MAX8649_SYNC		0x05
 30#define MAX8649_RAMP		0x06
 31#define MAX8649_CHIP_ID1	0x08
 32#define MAX8649_CHIP_ID2	0x09
 33
 34/* Bits */
 35#define MAX8649_EN_PD		(1 << 7)
 36#define MAX8649_VID0_PD		(1 << 6)
 37#define MAX8649_VID1_PD		(1 << 5)
 38#define MAX8649_VID_MASK	(3 << 5)
 39
 40#define MAX8649_FORCE_PWM	(1 << 7)
 41#define MAX8649_SYNC_EXTCLK	(1 << 6)
 42
 43#define MAX8649_EXT_MASK	(3 << 6)
 44
 45#define MAX8649_RAMP_MASK	(7 << 5)
 46#define MAX8649_RAMP_DOWN	(1 << 1)
 47
 48struct max8649_regulator_info {
 49	struct device		*dev;
 50	struct regmap		*regmap;
 51
 52	unsigned	mode:2;	/* bit[1:0] = VID1, VID0 */
 53	unsigned	extclk_freq:2;
 54	unsigned	extclk:1;
 55	unsigned	ramp_timing:3;
 56	unsigned	ramp_down:1;
 57};
 58
 59static int max8649_enable_time(struct regulator_dev *rdev)
 60{
 61	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 62	int voltage, rate, ret;
 63	unsigned int val;
 64
 65	/* get voltage */
 66	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
 67	if (ret != 0)
 68		return ret;
 69	val &= MAX8649_VOL_MASK;
 70	voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
 71
 72	/* get rate */
 73	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
 74	if (ret != 0)
 75		return ret;
 76	ret = (val & MAX8649_RAMP_MASK) >> 5;
 77	rate = (32 * 1000) >> ret;	/* uV/uS */
 78
 79	return DIV_ROUND_UP(voltage, rate);
 80}
 81
 82static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
 83{
 84	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
 85
 86	switch (mode) {
 87	case REGULATOR_MODE_FAST:
 88		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
 89				   MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
 90		break;
 91	case REGULATOR_MODE_NORMAL:
 92		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
 93				   MAX8649_FORCE_PWM, 0);
 94		break;
 95	default:
 96		return -EINVAL;
 97	}
 98	return 0;
 99}
100
101static unsigned int max8649_get_mode(struct regulator_dev *rdev)
102{
103	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
104	unsigned int val;
105	int ret;
106
107	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
108	if (ret != 0)
109		return ret;
110	if (val & MAX8649_FORCE_PWM)
111		return REGULATOR_MODE_FAST;
112	return REGULATOR_MODE_NORMAL;
113}
114
115static const struct regulator_ops max8649_dcdc_ops = {
116	.set_voltage_sel = regulator_set_voltage_sel_regmap,
117	.get_voltage_sel = regulator_get_voltage_sel_regmap,
118	.list_voltage	= regulator_list_voltage_linear,
119	.map_voltage	= regulator_map_voltage_linear,
120	.enable		= regulator_enable_regmap,
121	.disable	= regulator_disable_regmap,
122	.is_enabled	= regulator_is_enabled_regmap,
123	.enable_time	= max8649_enable_time,
124	.set_mode	= max8649_set_mode,
125	.get_mode	= max8649_get_mode,
126
127};
128
129static struct regulator_desc dcdc_desc = {
130	.name		= "max8649",
131	.ops		= &max8649_dcdc_ops,
132	.type		= REGULATOR_VOLTAGE,
133	.n_voltages	= 1 << 6,
134	.owner		= THIS_MODULE,
135	.vsel_mask	= MAX8649_VOL_MASK,
136	.min_uV		= MAX8649_DCDC_VMIN,
137	.uV_step	= MAX8649_DCDC_STEP,
138	.enable_reg	= MAX8649_CONTROL,
139	.enable_mask	= MAX8649_EN_PD,
140	.enable_is_inverted = true,
141};
142
143static const struct regmap_config max8649_regmap_config = {
144	.reg_bits = 8,
145	.val_bits = 8,
146};
147
148static int max8649_regulator_probe(struct i2c_client *client,
149					     const struct i2c_device_id *id)
150{
151	struct max8649_platform_data *pdata = dev_get_platdata(&client->dev);
152	struct max8649_regulator_info *info = NULL;
153	struct regulator_dev *regulator;
154	struct regulator_config config = { };
155	unsigned int val;
156	unsigned char data;
157	int ret;
158
159	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
160			    GFP_KERNEL);
161	if (!info)
162		return -ENOMEM;
163
164	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
165	if (IS_ERR(info->regmap)) {
166		ret = PTR_ERR(info->regmap);
167		dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
168		return ret;
169	}
170
171	info->dev = &client->dev;
172	i2c_set_clientdata(client, info);
173
174	info->mode = pdata->mode;
175	switch (info->mode) {
176	case 0:
177		dcdc_desc.vsel_reg = MAX8649_MODE0;
178		break;
179	case 1:
180		dcdc_desc.vsel_reg = MAX8649_MODE1;
181		break;
182	case 2:
183		dcdc_desc.vsel_reg = MAX8649_MODE2;
184		break;
185	case 3:
186		dcdc_desc.vsel_reg = MAX8649_MODE3;
187		break;
188	default:
189		break;
190	}
191
192	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
193	if (ret != 0) {
194		dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
195			ret);
196		return ret;
197	}
198	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
199
200	/* enable VID0 & VID1 */
201	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
202
203	/* enable/disable external clock synchronization */
204	info->extclk = pdata->extclk;
205	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
206	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
207			   MAX8649_SYNC_EXTCLK, data);
208	if (info->extclk) {
209		/* set external clock frequency */
210		info->extclk_freq = pdata->extclk_freq;
211		regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
212				   info->extclk_freq << 6);
213	}
214
215	if (pdata->ramp_timing) {
216		info->ramp_timing = pdata->ramp_timing;
217		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
218				   info->ramp_timing << 5);
219	}
220
221	info->ramp_down = pdata->ramp_down;
222	if (info->ramp_down) {
223		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
224				   MAX8649_RAMP_DOWN);
225	}
226
227	config.dev = &client->dev;
228	config.init_data = pdata->regulator;
229	config.driver_data = info;
230	config.regmap = info->regmap;
231
232	regulator = devm_regulator_register(&client->dev, &dcdc_desc,
233						  &config);
234	if (IS_ERR(regulator)) {
235		dev_err(info->dev, "failed to register regulator %s\n",
236			dcdc_desc.name);
237		return PTR_ERR(regulator);
238	}
239
240	return 0;
241}
242
243static const struct i2c_device_id max8649_id[] = {
244	{ "max8649", 0 },
245	{ }
246};
247MODULE_DEVICE_TABLE(i2c, max8649_id);
248
249static struct i2c_driver max8649_driver = {
250	.probe		= max8649_regulator_probe,
251	.driver		= {
252		.name	= "max8649",
253	},
254	.id_table	= max8649_id,
255};
256
257static int __init max8649_init(void)
258{
259	return i2c_add_driver(&max8649_driver);
260}
261subsys_initcall(max8649_init);
262
263static void __exit max8649_exit(void)
264{
265	i2c_del_driver(&max8649_driver);
266}
267module_exit(max8649_exit);
268
269/* Module information */
270MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
271MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
272MODULE_LICENSE("GPL");