1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max14577.c - Regulator driver for the Maxim 14577/77836
4 //
5 // Copyright (C) 2013,2014 Samsung Electronics
6 // Krzysztof Kozlowski <krzk@kernel.org>
7 
8 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/mfd/max14577.h>
12 #include <linux/mfd/max14577-private.h>
13 #include <linux/regulator/of_regulator.h>
14 
15 static int max14577_reg_is_enabled(struct regulator_dev *rdev)
16 {
17 	int rid = rdev_get_id(rdev);
18 	struct regmap *rmap = rdev->regmap;
19 	u8 reg_data;
20 
21 	switch (rid) {
22 	case MAX14577_CHARGER:
23 		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
24 		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
25 			return 0;
26 		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
27 		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
28 			return 0;
29 		/* MBCHOSTEN and CGMBC are on */
30 		return 1;
31 	default:
32 		return -EINVAL;
33 	}
34 }
35 
36 static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
37 {
38 	u8 reg_data;
39 	struct regmap *rmap = rdev->regmap;
40 	struct max14577 *max14577 = rdev_get_drvdata(rdev);
41 	const struct maxim_charger_current *limits =
42 		&maxim_charger_currents[max14577->dev_type];
43 
44 	if (rdev_get_id(rdev) != MAX14577_CHARGER)
45 		return -EINVAL;
46 
47 	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
48 
49 	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
50 		return limits->min;
51 
52 	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
53 			CHGCTRL4_MBCICHWRCH_SHIFT);
54 	return limits->high_start + reg_data * limits->high_step;
55 }
56 
57 static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
58 		int min_uA, int max_uA)
59 {
60 	u8 reg_data;
61 	int ret;
62 	struct max14577 *max14577 = rdev_get_drvdata(rdev);
63 	const struct maxim_charger_current *limits =
64 		&maxim_charger_currents[max14577->dev_type];
65 
66 	if (rdev_get_id(rdev) != MAX14577_CHARGER)
67 		return -EINVAL;
68 
69 	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
70 	if (ret)
71 		return ret;
72 
73 	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
74 			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
75 			reg_data);
76 }
77 
78 static const struct regulator_ops max14577_safeout_ops = {
79 	.is_enabled		= regulator_is_enabled_regmap,
80 	.enable			= regulator_enable_regmap,
81 	.disable		= regulator_disable_regmap,
82 	.list_voltage		= regulator_list_voltage_linear,
83 };
84 
85 static const struct regulator_ops max14577_charger_ops = {
86 	.is_enabled		= max14577_reg_is_enabled,
87 	.enable			= regulator_enable_regmap,
88 	.disable		= regulator_disable_regmap,
89 	.get_current_limit	= max14577_reg_get_current_limit,
90 	.set_current_limit	= max14577_reg_set_current_limit,
91 };
92 
93 #define MAX14577_SAFEOUT_REG	{ \
94 	.name		= "SAFEOUT", \
95 	.of_match	= of_match_ptr("SAFEOUT"), \
96 	.regulators_node = of_match_ptr("regulators"), \
97 	.id		= MAX14577_SAFEOUT, \
98 	.ops		= &max14577_safeout_ops, \
99 	.type		= REGULATOR_VOLTAGE, \
100 	.owner		= THIS_MODULE, \
101 	.n_voltages	= 1, \
102 	.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \
103 	.enable_reg	= MAX14577_REG_CONTROL2, \
104 	.enable_mask	= CTRL2_SFOUTORD_MASK, \
105 }
106 #define MAX14577_CHARGER_REG	{ \
107 	.name		= "CHARGER", \
108 	.of_match	= of_match_ptr("CHARGER"), \
109 	.regulators_node = of_match_ptr("regulators"), \
110 	.id		= MAX14577_CHARGER, \
111 	.ops		= &max14577_charger_ops, \
112 	.type		= REGULATOR_CURRENT, \
113 	.owner		= THIS_MODULE, \
114 	.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2, \
115 	.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK, \
116 }
117 
118 static const struct regulator_desc max14577_supported_regulators[] = {
119 	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
120 	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
121 };
122 
123 static const struct regulator_ops max77836_ldo_ops = {
124 	.is_enabled		= regulator_is_enabled_regmap,
125 	.enable			= regulator_enable_regmap,
126 	.disable		= regulator_disable_regmap,
127 	.list_voltage		= regulator_list_voltage_linear,
128 	.map_voltage		= regulator_map_voltage_linear,
129 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
130 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
131 	/* TODO: add .set_suspend_mode */
132 };
133 
134 #define MAX77836_LDO_REG(num)	{ \
135 	.name		= "LDO" # num, \
136 	.of_match	= of_match_ptr("LDO" # num), \
137 	.regulators_node = of_match_ptr("regulators"), \
138 	.id		= MAX77836_LDO ## num, \
139 	.ops		= &max77836_ldo_ops, \
140 	.type		= REGULATOR_VOLTAGE, \
141 	.owner		= THIS_MODULE, \
142 	.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
143 	.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
144 	.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
145 	.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
146 	.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK, \
147 	.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
148 	.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK, \
149 }
150 
151 static const struct regulator_desc max77836_supported_regulators[] = {
152 	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
153 	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
154 	[MAX77836_LDO1] = MAX77836_LDO_REG(1),
155 	[MAX77836_LDO2] = MAX77836_LDO_REG(2),
156 };
157 
158 /*
159  * Registers for regulators of max77836 use different I2C slave addresses so
160  * different regmaps must be used for them.
161  *
162  * Returns proper regmap for accessing regulator passed by id.
163  */
164 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
165 		int reg_id)
166 {
167 	switch (max14577->dev_type) {
168 	case MAXIM_DEVICE_TYPE_MAX77836:
169 		switch (reg_id) {
170 		case MAX77836_SAFEOUT ... MAX77836_CHARGER:
171 			return max14577->regmap;
172 		default:
173 			/* MAX77836_LDO1 ... MAX77836_LDO2 */
174 			return max14577->regmap_pmic;
175 		}
176 
177 	case MAXIM_DEVICE_TYPE_MAX14577:
178 	default:
179 		return max14577->regmap;
180 	}
181 }
182 
183 static int max14577_regulator_probe(struct platform_device *pdev)
184 {
185 	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
186 	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
187 	int i, ret = 0;
188 	struct regulator_config config = {};
189 	const struct regulator_desc *supported_regulators;
190 	unsigned int supported_regulators_size;
191 	enum maxim_device_type dev_type = max14577->dev_type;
192 
193 	switch (dev_type) {
194 	case MAXIM_DEVICE_TYPE_MAX77836:
195 		supported_regulators = max77836_supported_regulators;
196 		supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
197 		break;
198 	case MAXIM_DEVICE_TYPE_MAX14577:
199 	default:
200 		supported_regulators = max14577_supported_regulators;
201 		supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
202 	}
203 
204 	config.dev = max14577->dev;
205 	config.driver_data = max14577;
206 
207 	for (i = 0; i < supported_regulators_size; i++) {
208 		struct regulator_dev *regulator;
209 		/*
210 		 * Index of supported_regulators[] is also the id and must
211 		 * match index of pdata->regulators[].
212 		 */
213 		if (pdata && pdata->regulators) {
214 			config.init_data = pdata->regulators[i].initdata;
215 			config.of_node = pdata->regulators[i].of_node;
216 		}
217 		config.regmap = max14577_get_regmap(max14577,
218 				supported_regulators[i].id);
219 
220 		regulator = devm_regulator_register(&pdev->dev,
221 				&supported_regulators[i], &config);
222 		if (IS_ERR(regulator)) {
223 			ret = PTR_ERR(regulator);
224 			dev_err(&pdev->dev,
225 					"Regulator init failed for %d/%s with error: %d\n",
226 					i, supported_regulators[i].name, ret);
227 			return ret;
228 		}
229 	}
230 
231 	return ret;
232 }
233 
234 static const struct platform_device_id max14577_regulator_id[] = {
235 	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
236 	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
237 	{ }
238 };
239 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
240 
241 static struct platform_driver max14577_regulator_driver = {
242 	.driver = {
243 		   .name = "max14577-regulator",
244 		   },
245 	.probe		= max14577_regulator_probe,
246 	.id_table	= max14577_regulator_id,
247 };
248 
249 static int __init max14577_regulator_init(void)
250 {
251 	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
252 	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
253 
254 	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
255 			(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
256 			  (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
257 			MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
258 
259 	return platform_driver_register(&max14577_regulator_driver);
260 }
261 subsys_initcall(max14577_regulator_init);
262 
263 static void __exit max14577_regulator_exit(void)
264 {
265 	platform_driver_unregister(&max14577_regulator_driver);
266 }
267 module_exit(max14577_regulator_exit);
268 
269 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
270 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
271 MODULE_LICENSE("GPL");
272