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