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e7314653 IC |
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/of_device.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/regulator/driver.h> | |
15 | #include <linux/regulator/of_regulator.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/regmap.h> | |
18 | ||
19 | enum max77826_registers { | |
20 | MAX77826_REG_INT_SRC = 0x00, | |
21 | MAX77826_REG_SYS_INT, | |
22 | MAX77826_REG_INT1, | |
23 | MAX77826_REG_INT2, | |
24 | MAX77826_REG_BB_INT, | |
25 | MAX77826_REG_INT_SRC_M, | |
26 | MAX77826_REG_TOPSYS_INT_M, | |
27 | MAX77826_REG_INT1_M, | |
28 | MAX77826_REG_INT2_M, | |
29 | MAX77826_REG_BB_INT_M, | |
30 | MAX77826_REG_TOPSYS_STAT, | |
31 | MAX77826_REG_STAT1, | |
32 | MAX77826_REG_STAT2, | |
33 | MAX77826_REG_BB_STAT, | |
34 | /* 0x0E - 0x0F: Reserved */ | |
35 | MAX77826_REG_LDO_OPMD1 = 0x10, | |
36 | MAX77826_REG_LDO_OPMD2, | |
37 | MAX77826_REG_LDO_OPMD3, | |
38 | MAX77826_REG_LDO_OPMD4, | |
39 | MAX77826_REG_B_BB_OPMD, | |
40 | /* 0x15 - 0x1F: Reserved */ | |
41 | MAX77826_REG_LDO1_CFG = 0x20, | |
42 | MAX77826_REG_LDO2_CFG, | |
43 | MAX77826_REG_LDO3_CFG, | |
44 | MAX77826_REG_LDO4_CFG, | |
45 | MAX77826_REG_LDO5_CFG, | |
46 | MAX77826_REG_LDO6_CFG, | |
47 | MAX77826_REG_LDO7_CFG, | |
48 | MAX77826_REG_LDO8_CFG, | |
49 | MAX77826_REG_LDO9_CFG, | |
50 | MAX77826_REG_LDO10_CFG, | |
51 | MAX77826_REG_LDO11_CFG, | |
52 | MAX77826_REG_LDO12_CFG, | |
53 | MAX77826_REG_LDO13_CFG, | |
54 | MAX77826_REG_LDO14_CFG, | |
55 | MAX77826_REG_LDO15_CFG, | |
56 | /* 0x2F: Reserved */ | |
57 | MAX77826_REG_BUCK_CFG = 0x30, | |
58 | MAX77826_REG_BUCK_VOUT, | |
59 | MAX77826_REG_BB_CFG, | |
60 | MAX77826_REG_BB_VOUT, | |
61 | /* 0x34 - 0x3F: Reserved */ | |
62 | MAX77826_REG_BUCK_SS_FREQ = 0x40, | |
63 | MAX77826_REG_UVLO_FALL, | |
64 | /* 0x42 - 0xCE: Reserved */ | |
65 | MAX77826_REG_DEVICE_ID = 0xCF, | |
66 | }; | |
67 | ||
68 | enum max77826_regulators { | |
69 | MAX77826_LDO1 = 0, | |
70 | MAX77826_LDO2, | |
71 | MAX77826_LDO3, | |
72 | MAX77826_LDO4, | |
73 | MAX77826_LDO5, | |
74 | MAX77826_LDO6, | |
75 | MAX77826_LDO7, | |
76 | MAX77826_LDO8, | |
77 | MAX77826_LDO9, | |
78 | MAX77826_LDO10, | |
79 | MAX77826_LDO11, | |
80 | MAX77826_LDO12, | |
81 | MAX77826_LDO13, | |
82 | MAX77826_LDO14, | |
83 | MAX77826_LDO15, | |
84 | MAX77826_BUCK, | |
85 | MAX77826_BUCKBOOST, | |
86 | MAX77826_MAX_REGULATORS, | |
87 | }; | |
88 | ||
89 | #define MAX77826_MASK_LDO 0x7f | |
90 | #define MAX77826_MASK_BUCK 0xff | |
91 | #define MAX77826_MASK_BUCKBOOST 0x7f | |
92 | #define MAX77826_BUCK_RAMP_DELAY 12500 | |
93 | ||
94 | /* values in mV */ | |
95 | /* for LDO1-3 */ | |
96 | #define MAX77826_NMOS_LDO_VOLT_MIN 600000 | |
97 | #define MAX77826_NMOS_LDO_VOLT_MAX 2187500 | |
98 | #define MAX77826_NMOS_LDO_VOLT_STEP 12500 | |
99 | ||
100 | /* for LDO4-15 */ | |
101 | #define MAX77826_PMOS_LDO_VOLT_MIN 800000 | |
102 | #define MAX77826_PMOS_LDO_VOLT_MAX 3975000 | |
103 | #define MAX77826_PMOS_LDO_VOLT_STEP 25000 | |
104 | ||
105 | /* for BUCK */ | |
106 | #define MAX77826_BUCK_VOLT_MIN 500000 | |
107 | #define MAX77826_BUCK_VOLT_MAX 1800000 | |
108 | #define MAX77826_BUCK_VOLT_STEP 6250 | |
109 | ||
110 | /* for BUCKBOOST */ | |
111 | #define MAX77826_BUCKBOOST_VOLT_MIN 2600000 | |
112 | #define MAX77826_BUCKBOOST_VOLT_MAX 4187500 | |
113 | #define MAX77826_BUCKBOOST_VOLT_STEP 12500 | |
114 | #define MAX77826_VOLT_RANGE(_type) \ | |
115 | ((MAX77826_ ## _type ## _VOLT_MAX - \ | |
116 | MAX77826_ ## _type ## _VOLT_MIN) / \ | |
117 | MAX77826_ ## _type ## _VOLT_STEP + 1) | |
118 | ||
119 | #define MAX77826_LDO(_id, _type) \ | |
120 | [MAX77826_LDO ## _id] = { \ | |
121 | .id = MAX77826_LDO ## _id, \ | |
122 | .name = "LDO"#_id, \ | |
123 | .of_match = of_match_ptr("LDO"#_id), \ | |
124 | .regulators_node = "regulators", \ | |
125 | .ops = &max77826_most_ops, \ | |
126 | .min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN, \ | |
127 | .uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP, \ | |
128 | .n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO), \ | |
129 | .enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4, \ | |
130 | .enable_mask = BIT(((_id - 1) % 4) * 2 + 1), \ | |
131 | .vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1), \ | |
132 | .vsel_mask = MAX77826_MASK_LDO, \ | |
133 | .owner = THIS_MODULE, \ | |
134 | } | |
135 | ||
136 | #define MAX77826_BUCK(_idx, _id, _ops) \ | |
137 | [MAX77826_ ## _id] = { \ | |
138 | .id = MAX77826_ ## _id, \ | |
139 | .name = #_id, \ | |
140 | .of_match = of_match_ptr(#_id), \ | |
141 | .regulators_node = "regulators", \ | |
142 | .ops = &_ops, \ | |
143 | .min_uV = MAX77826_ ## _id ## _VOLT_MIN, \ | |
144 | .uV_step = MAX77826_ ## _id ## _VOLT_STEP, \ | |
145 | .n_voltages = MAX77826_VOLT_RANGE(_id), \ | |
146 | .enable_reg = MAX77826_REG_B_BB_OPMD, \ | |
147 | .enable_mask = BIT(_idx * 2 + 1), \ | |
148 | .vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2, \ | |
149 | .vsel_mask = MAX77826_MASK_ ## _id, \ | |
150 | .owner = THIS_MODULE, \ | |
151 | } | |
152 | ||
153 | ||
154 | ||
155 | struct max77826_regulator_info { | |
156 | struct regmap *regmap; | |
157 | struct regulator_desc *rdesc; | |
158 | }; | |
159 | ||
160 | static const struct regmap_config max77826_regmap_config = { | |
161 | .reg_bits = 8, | |
162 | .val_bits = 8, | |
163 | .max_register = MAX77826_REG_DEVICE_ID, | |
164 | }; | |
165 | ||
166 | static int max77826_set_voltage_time_sel(struct regulator_dev *, | |
167 | unsigned int old_selector, | |
168 | unsigned int new_selector); | |
169 | ||
170 | static const struct regulator_ops max77826_most_ops = { | |
171 | .enable = regulator_enable_regmap, | |
172 | .disable = regulator_disable_regmap, | |
173 | .is_enabled = regulator_is_enabled_regmap, | |
174 | .list_voltage = regulator_list_voltage_linear, | |
175 | .map_voltage = regulator_map_voltage_linear, | |
176 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
177 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
178 | }; | |
179 | ||
180 | static const struct regulator_ops max77826_buck_ops = { | |
181 | .enable = regulator_enable_regmap, | |
182 | .disable = regulator_disable_regmap, | |
183 | .is_enabled = regulator_is_enabled_regmap, | |
184 | .list_voltage = regulator_list_voltage_linear, | |
185 | .map_voltage = regulator_map_voltage_linear, | |
186 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
187 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
188 | .set_voltage_time_sel = max77826_set_voltage_time_sel, | |
189 | }; | |
190 | ||
191 | static struct regulator_desc max77826_regulators_desc[] = { | |
192 | MAX77826_LDO(1, NMOS), | |
193 | MAX77826_LDO(2, NMOS), | |
194 | MAX77826_LDO(3, NMOS), | |
195 | MAX77826_LDO(4, PMOS), | |
196 | MAX77826_LDO(5, PMOS), | |
197 | MAX77826_LDO(6, PMOS), | |
198 | MAX77826_LDO(7, PMOS), | |
199 | MAX77826_LDO(8, PMOS), | |
200 | MAX77826_LDO(9, PMOS), | |
201 | MAX77826_LDO(10, PMOS), | |
202 | MAX77826_LDO(11, PMOS), | |
203 | MAX77826_LDO(12, PMOS), | |
204 | MAX77826_LDO(13, PMOS), | |
205 | MAX77826_LDO(14, PMOS), | |
206 | MAX77826_LDO(15, PMOS), | |
207 | MAX77826_BUCK(0, BUCK, max77826_buck_ops), | |
208 | MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops), | |
209 | }; | |
210 | ||
211 | static int max77826_set_voltage_time_sel(struct regulator_dev *rdev, | |
212 | unsigned int old_selector, | |
213 | unsigned int new_selector) | |
214 | { | |
215 | if (new_selector > old_selector) { | |
216 | return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP * | |
217 | (new_selector - old_selector), | |
218 | MAX77826_BUCK_RAMP_DELAY); | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int max77826_read_device_id(struct regmap *regmap, struct device *dev) | |
225 | { | |
226 | unsigned int device_id; | |
227 | int res; | |
228 | ||
229 | res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id); | |
230 | if (!res) | |
231 | dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id); | |
232 | ||
233 | return res; | |
234 | } | |
235 | ||
236 | static int max77826_i2c_probe(struct i2c_client *client) | |
237 | { | |
238 | struct device *dev = &client->dev; | |
239 | struct max77826_regulator_info *info; | |
240 | struct regulator_config config = {}; | |
241 | struct regulator_dev *rdev; | |
242 | struct regmap *regmap; | |
243 | int i; | |
244 | ||
245 | info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info), | |
246 | GFP_KERNEL); | |
247 | if (!info) | |
248 | return -ENOMEM; | |
249 | ||
250 | info->rdesc = max77826_regulators_desc; | |
251 | regmap = devm_regmap_init_i2c(client, &max77826_regmap_config); | |
252 | if (IS_ERR(regmap)) { | |
253 | dev_err(dev, "Failed to allocate regmap!\n"); | |
254 | return PTR_ERR(regmap); | |
255 | } | |
256 | ||
257 | info->regmap = regmap; | |
258 | i2c_set_clientdata(client, info); | |
259 | ||
260 | config.dev = dev; | |
261 | config.regmap = regmap; | |
262 | config.driver_data = info; | |
263 | ||
264 | for (i = 0; i < MAX77826_MAX_REGULATORS; i++) { | |
265 | rdev = devm_regulator_register(dev, | |
266 | &max77826_regulators_desc[i], | |
267 | &config); | |
268 | if (IS_ERR(rdev)) { | |
269 | dev_err(dev, "Failed to register regulator!\n"); | |
270 | return PTR_ERR(rdev); | |
271 | } | |
272 | } | |
273 | ||
274 | return max77826_read_device_id(regmap, dev); | |
275 | } | |
276 | ||
7bf0a29c | 277 | static const struct of_device_id __maybe_unused max77826_of_match[] = { |
e7314653 IC |
278 | { .compatible = "maxim,max77826" }, |
279 | { /* sentinel */ } | |
280 | }; | |
281 | MODULE_DEVICE_TABLE(of, max77826_of_match); | |
282 | ||
283 | static const struct i2c_device_id max77826_id[] = { | |
284 | { "max77826-regulator" }, | |
285 | { /* sentinel */ } | |
286 | }; | |
287 | MODULE_DEVICE_TABLE(i2c, max77826_id); | |
288 | ||
289 | static struct i2c_driver max77826_regulator_driver = { | |
290 | .driver = { | |
291 | .name = "max77826", | |
292 | .of_match_table = of_match_ptr(max77826_of_match), | |
293 | }, | |
294 | .probe_new = 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"); |