1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
|
// SPDX-License-Identifier: GPL-2.0-or-later
//
// max77826-regulator.c - regulator driver for Maxim MAX77826
//
// Author: Iskren Chernev <iskren.chernev@gmail.com>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
enum max77826_registers {
MAX77826_REG_INT_SRC = 0x00,
MAX77826_REG_SYS_INT,
MAX77826_REG_INT1,
MAX77826_REG_INT2,
MAX77826_REG_BB_INT,
MAX77826_REG_INT_SRC_M,
MAX77826_REG_TOPSYS_INT_M,
MAX77826_REG_INT1_M,
MAX77826_REG_INT2_M,
MAX77826_REG_BB_INT_M,
MAX77826_REG_TOPSYS_STAT,
MAX77826_REG_STAT1,
MAX77826_REG_STAT2,
MAX77826_REG_BB_STAT,
/* 0x0E - 0x0F: Reserved */
MAX77826_REG_LDO_OPMD1 = 0x10,
MAX77826_REG_LDO_OPMD2,
MAX77826_REG_LDO_OPMD3,
MAX77826_REG_LDO_OPMD4,
MAX77826_REG_B_BB_OPMD,
/* 0x15 - 0x1F: Reserved */
MAX77826_REG_LDO1_CFG = 0x20,
MAX77826_REG_LDO2_CFG,
MAX77826_REG_LDO3_CFG,
MAX77826_REG_LDO4_CFG,
MAX77826_REG_LDO5_CFG,
MAX77826_REG_LDO6_CFG,
MAX77826_REG_LDO7_CFG,
MAX77826_REG_LDO8_CFG,
MAX77826_REG_LDO9_CFG,
MAX77826_REG_LDO10_CFG,
MAX77826_REG_LDO11_CFG,
MAX77826_REG_LDO12_CFG,
MAX77826_REG_LDO13_CFG,
MAX77826_REG_LDO14_CFG,
MAX77826_REG_LDO15_CFG,
/* 0x2F: Reserved */
MAX77826_REG_BUCK_CFG = 0x30,
MAX77826_REG_BUCK_VOUT,
MAX77826_REG_BB_CFG,
MAX77826_REG_BB_VOUT,
/* 0x34 - 0x3F: Reserved */
MAX77826_REG_BUCK_SS_FREQ = 0x40,
MAX77826_REG_UVLO_FALL,
/* 0x42 - 0xCE: Reserved */
MAX77826_REG_DEVICE_ID = 0xCF,
};
enum max77826_regulators {
MAX77826_LDO1 = 0,
MAX77826_LDO2,
MAX77826_LDO3,
MAX77826_LDO4,
MAX77826_LDO5,
MAX77826_LDO6,
MAX77826_LDO7,
MAX77826_LDO8,
MAX77826_LDO9,
MAX77826_LDO10,
MAX77826_LDO11,
MAX77826_LDO12,
MAX77826_LDO13,
MAX77826_LDO14,
MAX77826_LDO15,
MAX77826_BUCK,
MAX77826_BUCKBOOST,
MAX77826_MAX_REGULATORS,
};
#define MAX77826_MASK_LDO 0x7f
#define MAX77826_MASK_BUCK 0xff
#define MAX77826_MASK_BUCKBOOST 0x7f
#define MAX77826_BUCK_RAMP_DELAY 12500
/* values in mV */
/* for LDO1-3 */
#define MAX77826_NMOS_LDO_VOLT_MIN 600000
#define MAX77826_NMOS_LDO_VOLT_MAX 2187500
#define MAX77826_NMOS_LDO_VOLT_STEP 12500
/* for LDO4-15 */
#define MAX77826_PMOS_LDO_VOLT_MIN 800000
#define MAX77826_PMOS_LDO_VOLT_MAX 3975000
#define MAX77826_PMOS_LDO_VOLT_STEP 25000
/* for BUCK */
#define MAX77826_BUCK_VOLT_MIN 500000
#define MAX77826_BUCK_VOLT_MAX 1800000
#define MAX77826_BUCK_VOLT_STEP 6250
/* for BUCKBOOST */
#define MAX77826_BUCKBOOST_VOLT_MIN 2600000
#define MAX77826_BUCKBOOST_VOLT_MAX 4187500
#define MAX77826_BUCKBOOST_VOLT_STEP 12500
#define MAX77826_VOLT_RANGE(_type) \
((MAX77826_ ## _type ## _VOLT_MAX - \
MAX77826_ ## _type ## _VOLT_MIN) / \
MAX77826_ ## _type ## _VOLT_STEP + 1)
#define MAX77826_LDO(_id, _type) \
[MAX77826_LDO ## _id] = { \
.id = MAX77826_LDO ## _id, \
.name = "LDO"#_id, \
.of_match = of_match_ptr("LDO"#_id), \
.regulators_node = "regulators", \
.ops = &max77826_most_ops, \
.min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \
.uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \
.n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \
.enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \
.enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \
.vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \
.vsel_mask = MAX77826_MASK_LDO, \
.owner = THIS_MODULE, \
}
#define MAX77826_BUCK(_idx, _id, _ops) \
[MAX77826_ ## _id] = { \
.id = MAX77826_ ## _id, \
.name = #_id, \
.of_match = of_match_ptr(#_id), \
.regulators_node = "regulators", \
.ops = &_ops, \
.min_uV = MAX77826_ ## _id ## _VOLT_MIN, \
.uV_step = MAX77826_ ## _id ## _VOLT_STEP, \
.n_voltages = MAX77826_VOLT_RANGE(_id), \
.enable_reg = MAX77826_REG_B_BB_OPMD, \
.enable_mask = BIT(_idx * 2 + 1), \
.vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \
.vsel_mask = MAX77826_MASK_ ## _id, \
.owner = THIS_MODULE, \
}
struct max77826_regulator_info {
struct regmap *regmap;
};
static const struct regmap_config max77826_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77826_REG_DEVICE_ID,
};
static int max77826_set_voltage_time_sel(struct regulator_dev *,
unsigned int old_selector,
unsigned int new_selector);
static const struct regulator_ops max77826_most_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
};
static const struct regulator_ops max77826_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_time_sel = max77826_set_voltage_time_sel,
};
static const struct regulator_desc max77826_regulators_desc[] = {
MAX77826_LDO(1, NMOS),
MAX77826_LDO(2, NMOS),
MAX77826_LDO(3, NMOS),
MAX77826_LDO(4, PMOS),
MAX77826_LDO(5, PMOS),
MAX77826_LDO(6, PMOS),
MAX77826_LDO(7, PMOS),
MAX77826_LDO(8, PMOS),
MAX77826_LDO(9, PMOS),
MAX77826_LDO(10, PMOS),
MAX77826_LDO(11, PMOS),
MAX77826_LDO(12, PMOS),
MAX77826_LDO(13, PMOS),
MAX77826_LDO(14, PMOS),
MAX77826_LDO(15, PMOS),
MAX77826_BUCK(0, BUCK, max77826_buck_ops),
MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
};
static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
if (new_selector > old_selector) {
return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
(new_selector - old_selector),
MAX77826_BUCK_RAMP_DELAY);
}
return 0;
}
static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
{
unsigned int device_id;
int res;
res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
if (!res)
dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
return res;
}
static int max77826_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct max77826_regulator_info *info;
struct regulator_config config = {};
struct regulator_dev *rdev;
struct regmap *regmap;
int i;
info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
if (IS_ERR(regmap)) {
dev_err(dev, "Failed to allocate regmap!\n");
return PTR_ERR(regmap);
}
info->regmap = regmap;
i2c_set_clientdata(client, info);
config.dev = dev;
config.regmap = regmap;
config.driver_data = info;
for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
rdev = devm_regulator_register(dev,
&max77826_regulators_desc[i],
&config);
if (IS_ERR(rdev)) {
dev_err(dev, "Failed to register regulator!\n");
return PTR_ERR(rdev);
}
}
return max77826_read_device_id(regmap, dev);
}
static const struct of_device_id __maybe_unused max77826_of_match[] = {
{ .compatible = "maxim,max77826" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, max77826_of_match);
static const struct i2c_device_id max77826_id[] = {
{ "max77826-regulator" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, max77826_id);
static struct i2c_driver max77826_regulator_driver = {
.driver = {
.name = "max77826",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(max77826_of_match),
},
.probe = max77826_i2c_probe,
.id_table = max77826_id,
};
module_i2c_driver(max77826_regulator_driver);
MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
MODULE_LICENSE("GPL");
|
