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	struct regulator_desc *rdesc;
157};
158
159static const struct regmap_config max77826_regmap_config = {
160	.reg_bits = 8,
161	.val_bits = 8,
162	.max_register = MAX77826_REG_DEVICE_ID,
163};
164
165static int max77826_set_voltage_time_sel(struct regulator_dev *,
166				unsigned int old_selector,
167				unsigned int new_selector);
168
169static 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
179static 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
190static 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
210static 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
223static 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
235static 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
276static const struct of_device_id __maybe_unused max77826_of_match[] = {
277	{ .compatible = "maxim,max77826" },
278	{ /* sentinel */ }
279};
280MODULE_DEVICE_TABLE(of, max77826_of_match);
281
282static const struct i2c_device_id max77826_id[] = {
283	{ "max77826-regulator" },
284	{ /* sentinel */ }
285};
286MODULE_DEVICE_TABLE(i2c, max77826_id);
287
288static 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};
297module_i2c_driver(max77826_regulator_driver);
298
299MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
300MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
301MODULE_LICENSE("GPL");
302