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
18 enum 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
67 enum 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
154 struct max77826_regulator_info {
155 struct regmap *regmap;
156 struct regulator_desc *rdesc;
157 };
158
159 static const struct regmap_config max77826_regmap_config = {
160 .reg_bits = 8,
161 .val_bits = 8,
162 .max_register = MAX77826_REG_DEVICE_ID,
163 };
164
165 static int max77826_set_voltage_time_sel(struct regulator_dev *,
166 unsigned int old_selector,
167 unsigned int new_selector);
168
169 static const struct regulator_ops max77826_most_ops = {
170 .enable = regulator_enable_regmap,
171 .disable = regulator_disable_regmap,
172 .is_enabled = regulator_is_enabled_regmap,
173 .list_voltage = regulator_list_voltage_linear,
174 .map_voltage = regulator_map_voltage_linear,
175 .get_voltage_sel = regulator_get_voltage_sel_regmap,
176 .set_voltage_sel = regulator_set_voltage_sel_regmap,
177 };
178
179 static const struct regulator_ops max77826_buck_ops = {
180 .enable = regulator_enable_regmap,
181 .disable = regulator_disable_regmap,
182 .is_enabled = regulator_is_enabled_regmap,
183 .list_voltage = regulator_list_voltage_linear,
184 .map_voltage = regulator_map_voltage_linear,
185 .get_voltage_sel = regulator_get_voltage_sel_regmap,
186 .set_voltage_sel = regulator_set_voltage_sel_regmap,
187 .set_voltage_time_sel = max77826_set_voltage_time_sel,
188 };
189
190 static struct regulator_desc max77826_regulators_desc[] = {
191 MAX77826_LDO(1, NMOS),
192 MAX77826_LDO(2, NMOS),
193 MAX77826_LDO(3, NMOS),
194 MAX77826_LDO(4, PMOS),
195 MAX77826_LDO(5, PMOS),
196 MAX77826_LDO(6, PMOS),
197 MAX77826_LDO(7, PMOS),
198 MAX77826_LDO(8, PMOS),
199 MAX77826_LDO(9, PMOS),
200 MAX77826_LDO(10, PMOS),
201 MAX77826_LDO(11, PMOS),
202 MAX77826_LDO(12, PMOS),
203 MAX77826_LDO(13, PMOS),
204 MAX77826_LDO(14, PMOS),
205 MAX77826_LDO(15, PMOS),
206 MAX77826_BUCK(0, BUCK, max77826_buck_ops),
207 MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
208 };
209
max77826_set_voltage_time_sel(struct regulator_dev * rdev,unsigned int old_selector,unsigned int new_selector)210 static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
211 unsigned int old_selector,
212 unsigned int new_selector)
213 {
214 if (new_selector > old_selector) {
215 return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
216 (new_selector - old_selector),
217 MAX77826_BUCK_RAMP_DELAY);
218 }
219
220 return 0;
221 }
222
max77826_read_device_id(struct regmap * regmap,struct device * dev)223 static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
224 {
225 unsigned int device_id;
226 int res;
227
228 res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
229 if (!res)
230 dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
231
232 return res;
233 }
234
max77826_i2c_probe(struct i2c_client * client)235 static int max77826_i2c_probe(struct i2c_client *client)
236 {
237 struct device *dev = &client->dev;
238 struct max77826_regulator_info *info;
239 struct regulator_config config = {};
240 struct regulator_dev *rdev;
241 struct regmap *regmap;
242 int i;
243
244 info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
245 GFP_KERNEL);
246 if (!info)
247 return -ENOMEM;
248
249 info->rdesc = max77826_regulators_desc;
250 regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
251 if (IS_ERR(regmap)) {
252 dev_err(dev, "Failed to allocate regmap!\n");
253 return PTR_ERR(regmap);
254 }
255
256 info->regmap = regmap;
257 i2c_set_clientdata(client, info);
258
259 config.dev = dev;
260 config.regmap = regmap;
261 config.driver_data = info;
262
263 for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
264 rdev = devm_regulator_register(dev,
265 &max77826_regulators_desc[i],
266 &config);
267 if (IS_ERR(rdev)) {
268 dev_err(dev, "Failed to register regulator!\n");
269 return PTR_ERR(rdev);
270 }
271 }
272
273 return max77826_read_device_id(regmap, dev);
274 }
275
276 static const struct of_device_id __maybe_unused max77826_of_match[] = {
277 { .compatible = "maxim,max77826" },
278 { /* sentinel */ }
279 };
280 MODULE_DEVICE_TABLE(of, max77826_of_match);
281
282 static const struct i2c_device_id max77826_id[] = {
283 { "max77826-regulator" },
284 { /* sentinel */ }
285 };
286 MODULE_DEVICE_TABLE(i2c, max77826_id);
287
288 static struct i2c_driver max77826_regulator_driver = {
289 .driver = {
290 .name = "max77826",
291 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
292 .of_match_table = of_match_ptr(max77826_of_match),
293 },
294 .probe = max77826_i2c_probe,
295 .id_table = max77826_id,
296 };
297 module_i2c_driver(max77826_regulator_driver);
298
299 MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
300 MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
301 MODULE_LICENSE("GPL");
302