1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Regulators driver for Maxim max8925
4  *
5  * Copyright (C) 2009 Marvell International Ltd.
6  *      Haojian Zhuang <haojian.zhuang@marvell.com>
7  */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/mfd/max8925.h>
17 #include <linux/of.h>
18 #include <linux/regulator/of_regulator.h>
19 
20 #define SD1_DVM_VMIN		850000
21 #define SD1_DVM_VMAX		1000000
22 #define SD1_DVM_STEP		50000
23 #define SD1_DVM_SHIFT		5		/* SDCTL1 bit5 */
24 #define SD1_DVM_EN		6		/* SDV1 bit 6 */
25 
26 /* bit definitions in LDO control registers */
27 #define LDO_SEQ_I2C		0x7		/* Power U/D by i2c */
28 #define LDO_SEQ_MASK		0x7		/* Power U/D sequence mask */
29 #define LDO_SEQ_SHIFT		2		/* Power U/D sequence offset */
30 #define LDO_I2C_EN		0x1		/* Enable by i2c */
31 #define LDO_I2C_EN_MASK		0x1		/* Enable mask by i2c */
32 #define LDO_I2C_EN_SHIFT	0		/* Enable offset by i2c */
33 
34 struct max8925_regulator_info {
35 	struct regulator_desc	desc;
36 	struct i2c_client	*i2c;
37 
38 	int	vol_reg;
39 	int	enable_reg;
40 };
41 
max8925_set_voltage_sel(struct regulator_dev * rdev,unsigned int selector)42 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
43 				   unsigned int selector)
44 {
45 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
46 	unsigned char mask = rdev->desc->n_voltages - 1;
47 
48 	return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
49 }
50 
max8925_get_voltage_sel(struct regulator_dev * rdev)51 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
52 {
53 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
54 	unsigned char data, mask;
55 	int ret;
56 
57 	ret = max8925_reg_read(info->i2c, info->vol_reg);
58 	if (ret < 0)
59 		return ret;
60 	mask = rdev->desc->n_voltages - 1;
61 	data = ret & mask;
62 
63 	return data;
64 }
65 
max8925_enable(struct regulator_dev * rdev)66 static int max8925_enable(struct regulator_dev *rdev)
67 {
68 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
69 
70 	return max8925_set_bits(info->i2c, info->enable_reg,
71 				LDO_SEQ_MASK << LDO_SEQ_SHIFT |
72 				LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
73 				LDO_SEQ_I2C << LDO_SEQ_SHIFT |
74 				LDO_I2C_EN << LDO_I2C_EN_SHIFT);
75 }
76 
max8925_disable(struct regulator_dev * rdev)77 static int max8925_disable(struct regulator_dev *rdev)
78 {
79 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
80 
81 	return max8925_set_bits(info->i2c, info->enable_reg,
82 				LDO_SEQ_MASK << LDO_SEQ_SHIFT |
83 				LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
84 				LDO_SEQ_I2C << LDO_SEQ_SHIFT);
85 }
86 
max8925_is_enabled(struct regulator_dev * rdev)87 static int max8925_is_enabled(struct regulator_dev *rdev)
88 {
89 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
90 	int ldo_seq, ret;
91 
92 	ret = max8925_reg_read(info->i2c, info->enable_reg);
93 	if (ret < 0)
94 		return ret;
95 	ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
96 	if (ldo_seq != LDO_SEQ_I2C)
97 		return 1;
98 	else
99 		return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
100 }
101 
max8925_set_dvm_voltage(struct regulator_dev * rdev,int uV)102 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
103 {
104 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
105 	unsigned char data, mask;
106 
107 	if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
108 		return -EINVAL;
109 
110 	data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
111 	data <<= SD1_DVM_SHIFT;
112 	mask = 3 << SD1_DVM_SHIFT;
113 
114 	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
115 }
116 
max8925_set_dvm_enable(struct regulator_dev * rdev)117 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
118 {
119 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
120 
121 	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
122 				1 << SD1_DVM_EN);
123 }
124 
max8925_set_dvm_disable(struct regulator_dev * rdev)125 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
126 {
127 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
128 
129 	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
130 }
131 
132 static const struct regulator_ops max8925_regulator_sdv_ops = {
133 	.map_voltage		= regulator_map_voltage_linear,
134 	.list_voltage		= regulator_list_voltage_linear,
135 	.set_voltage_sel	= max8925_set_voltage_sel,
136 	.get_voltage_sel	= max8925_get_voltage_sel,
137 	.enable			= max8925_enable,
138 	.disable		= max8925_disable,
139 	.is_enabled		= max8925_is_enabled,
140 	.set_suspend_voltage	= max8925_set_dvm_voltage,
141 	.set_suspend_enable	= max8925_set_dvm_enable,
142 	.set_suspend_disable	= max8925_set_dvm_disable,
143 };
144 
145 static const struct regulator_ops max8925_regulator_ldo_ops = {
146 	.map_voltage		= regulator_map_voltage_linear,
147 	.list_voltage		= regulator_list_voltage_linear,
148 	.set_voltage_sel	= max8925_set_voltage_sel,
149 	.get_voltage_sel	= max8925_get_voltage_sel,
150 	.enable			= max8925_enable,
151 	.disable		= max8925_disable,
152 	.is_enabled		= max8925_is_enabled,
153 };
154 
155 #define MAX8925_SDV(_id, min, max, step)			\
156 {								\
157 	.desc	= {						\
158 		.name	= "SDV" #_id,				\
159 		.of_match = of_match_ptr("SDV" #_id),		\
160 		.regulators_node = of_match_ptr("regulators"),	\
161 		.ops	= &max8925_regulator_sdv_ops,		\
162 		.type	= REGULATOR_VOLTAGE,			\
163 		.id	= MAX8925_ID_SD##_id,			\
164 		.owner	= THIS_MODULE,				\
165 		.n_voltages = 64,				\
166 		.min_uV = min * 1000,				\
167 		.uV_step = step * 1000,				\
168 	},							\
169 	.vol_reg	= MAX8925_SDV##_id,			\
170 	.enable_reg	= MAX8925_SDCTL##_id,			\
171 }
172 
173 #define MAX8925_LDO(_id, min, max, step)			\
174 {								\
175 	.desc	= {						\
176 		.name	= "LDO" #_id,				\
177 		.of_match = of_match_ptr("LDO" #_id),		\
178 		.regulators_node = of_match_ptr("regulators"),	\
179 		.ops	= &max8925_regulator_ldo_ops,		\
180 		.type	= REGULATOR_VOLTAGE,			\
181 		.id	= MAX8925_ID_LDO##_id,			\
182 		.owner	= THIS_MODULE,				\
183 		.n_voltages = 64,				\
184 		.min_uV = min * 1000,				\
185 		.uV_step = step * 1000,				\
186 	},							\
187 	.vol_reg	= MAX8925_LDOVOUT##_id,			\
188 	.enable_reg	= MAX8925_LDOCTL##_id,			\
189 }
190 
191 static struct max8925_regulator_info max8925_regulator_info[] = {
192 	MAX8925_SDV(1, 637.5, 1425, 12.5),
193 	MAX8925_SDV(2,   650, 2225,   25),
194 	MAX8925_SDV(3,   750, 3900,   50),
195 
196 	MAX8925_LDO(1,  750, 3900, 50),
197 	MAX8925_LDO(2,  650, 2250, 25),
198 	MAX8925_LDO(3,  650, 2250, 25),
199 	MAX8925_LDO(4,  750, 3900, 50),
200 	MAX8925_LDO(5,  750, 3900, 50),
201 	MAX8925_LDO(6,  750, 3900, 50),
202 	MAX8925_LDO(7,  750, 3900, 50),
203 	MAX8925_LDO(8,  750, 3900, 50),
204 	MAX8925_LDO(9,  750, 3900, 50),
205 	MAX8925_LDO(10, 750, 3900, 50),
206 	MAX8925_LDO(11, 750, 3900, 50),
207 	MAX8925_LDO(12, 750, 3900, 50),
208 	MAX8925_LDO(13, 750, 3900, 50),
209 	MAX8925_LDO(14, 750, 3900, 50),
210 	MAX8925_LDO(15, 750, 3900, 50),
211 	MAX8925_LDO(16, 750, 3900, 50),
212 	MAX8925_LDO(17, 650, 2250, 25),
213 	MAX8925_LDO(18, 650, 2250, 25),
214 	MAX8925_LDO(19, 750, 3900, 50),
215 	MAX8925_LDO(20, 750, 3900, 50),
216 };
217 
max8925_regulator_probe(struct platform_device * pdev)218 static int max8925_regulator_probe(struct platform_device *pdev)
219 {
220 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
221 	struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
222 	struct regulator_config config = { };
223 	struct max8925_regulator_info *ri;
224 	struct resource *res;
225 	struct regulator_dev *rdev;
226 	int i;
227 
228 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
229 	if (!res) {
230 		dev_err(&pdev->dev, "No REG resource!\n");
231 		return -EINVAL;
232 	}
233 	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
234 		ri = &max8925_regulator_info[i];
235 		if (ri->vol_reg == res->start)
236 			break;
237 	}
238 
239 	if (i == ARRAY_SIZE(max8925_regulator_info)) {
240 		dev_err(&pdev->dev, "Failed to find regulator %llu\n",
241 			(unsigned long long)res->start);
242 		return -EINVAL;
243 	}
244 	ri->i2c = chip->i2c;
245 
246 	config.dev = chip->dev;
247 	config.driver_data = ri;
248 
249 	if (pdata)
250 		config.init_data = pdata;
251 
252 	rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
253 	if (IS_ERR(rdev)) {
254 		dev_err(&pdev->dev, "failed to register regulator %s\n",
255 				ri->desc.name);
256 		return PTR_ERR(rdev);
257 	}
258 
259 	platform_set_drvdata(pdev, rdev);
260 	return 0;
261 }
262 
263 static struct platform_driver max8925_regulator_driver = {
264 	.driver		= {
265 		.name	= "max8925-regulator",
266 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
267 	},
268 	.probe		= max8925_regulator_probe,
269 };
270 
max8925_regulator_init(void)271 static int __init max8925_regulator_init(void)
272 {
273 	return platform_driver_register(&max8925_regulator_driver);
274 }
275 subsys_initcall(max8925_regulator_init);
276 
max8925_regulator_exit(void)277 static void __exit max8925_regulator_exit(void)
278 {
279 	platform_driver_unregister(&max8925_regulator_driver);
280 }
281 module_exit(max8925_regulator_exit);
282 
283 MODULE_LICENSE("GPL");
284 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
285 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
286 MODULE_ALIAS("platform:max8925-regulator");
287