Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux-2.6-microblaze.git] / drivers / regulator / max14577-regulator.c
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 #ifdef CONFIG_OF
159 static struct of_regulator_match max14577_regulator_matches[] = {
160         { .name = "SAFEOUT", },
161         { .name = "CHARGER", },
162 };
163
164 static struct of_regulator_match max77836_regulator_matches[] = {
165         { .name = "SAFEOUT", },
166         { .name = "CHARGER", },
167         { .name = "LDO1", },
168         { .name = "LDO2", },
169 };
170
171 static inline struct regulator_init_data *match_init_data(int index,
172                 enum maxim_device_type dev_type)
173 {
174         switch (dev_type) {
175         case MAXIM_DEVICE_TYPE_MAX77836:
176                 return max77836_regulator_matches[index].init_data;
177
178         case MAXIM_DEVICE_TYPE_MAX14577:
179         default:
180                 return max14577_regulator_matches[index].init_data;
181         }
182 }
183
184 static inline struct device_node *match_of_node(int index,
185                 enum maxim_device_type dev_type)
186 {
187         switch (dev_type) {
188         case MAXIM_DEVICE_TYPE_MAX77836:
189                 return max77836_regulator_matches[index].of_node;
190
191         case MAXIM_DEVICE_TYPE_MAX14577:
192         default:
193                 return max14577_regulator_matches[index].of_node;
194         }
195 }
196 #else /* CONFIG_OF */
197 static inline struct regulator_init_data *match_init_data(int index,
198                 enum maxim_device_type dev_type)
199 {
200         return NULL;
201 }
202
203 static inline struct device_node *match_of_node(int index,
204                 enum maxim_device_type dev_type)
205 {
206         return NULL;
207 }
208 #endif /* CONFIG_OF */
209
210 /**
211  * Registers for regulators of max77836 use different I2C slave addresses so
212  * different regmaps must be used for them.
213  *
214  * Returns proper regmap for accessing regulator passed by id.
215  */
216 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
217                 int reg_id)
218 {
219         switch (max14577->dev_type) {
220         case MAXIM_DEVICE_TYPE_MAX77836:
221                 switch (reg_id) {
222                 case MAX77836_SAFEOUT ... MAX77836_CHARGER:
223                         return max14577->regmap;
224                 default:
225                         /* MAX77836_LDO1 ... MAX77836_LDO2 */
226                         return max14577->regmap_pmic;
227                 }
228
229         case MAXIM_DEVICE_TYPE_MAX14577:
230         default:
231                 return max14577->regmap;
232         }
233 }
234
235 static int max14577_regulator_probe(struct platform_device *pdev)
236 {
237         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
238         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
239         int i, ret = 0;
240         struct regulator_config config = {};
241         const struct regulator_desc *supported_regulators;
242         unsigned int supported_regulators_size;
243         enum maxim_device_type dev_type = max14577->dev_type;
244
245         switch (dev_type) {
246         case MAXIM_DEVICE_TYPE_MAX77836:
247                 supported_regulators = max77836_supported_regulators;
248                 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
249                 break;
250         case MAXIM_DEVICE_TYPE_MAX14577:
251         default:
252                 supported_regulators = max14577_supported_regulators;
253                 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
254         }
255
256         config.dev = max14577->dev;
257         config.driver_data = max14577;
258
259         for (i = 0; i < supported_regulators_size; i++) {
260                 struct regulator_dev *regulator;
261                 /*
262                  * Index of supported_regulators[] is also the id and must
263                  * match index of pdata->regulators[].
264                  */
265                 if (pdata && pdata->regulators) {
266                         config.init_data = pdata->regulators[i].initdata;
267                         config.of_node = pdata->regulators[i].of_node;
268                 } else {
269                         config.init_data = match_init_data(i, dev_type);
270                         config.of_node = match_of_node(i, dev_type);
271                 }
272                 config.regmap = max14577_get_regmap(max14577,
273                                 supported_regulators[i].id);
274
275                 regulator = devm_regulator_register(&pdev->dev,
276                                 &supported_regulators[i], &config);
277                 if (IS_ERR(regulator)) {
278                         ret = PTR_ERR(regulator);
279                         dev_err(&pdev->dev,
280                                         "Regulator init failed for %d/%s with error: %d\n",
281                                         i, supported_regulators[i].name, ret);
282                         return ret;
283                 }
284         }
285
286         return ret;
287 }
288
289 static const struct platform_device_id max14577_regulator_id[] = {
290         { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
291         { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
292         { }
293 };
294 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
295
296 static struct platform_driver max14577_regulator_driver = {
297         .driver = {
298                    .name = "max14577-regulator",
299                    },
300         .probe          = max14577_regulator_probe,
301         .id_table       = max14577_regulator_id,
302 };
303
304 static int __init max14577_regulator_init(void)
305 {
306         BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
307         BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
308
309         BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
310                         (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
311                           (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
312                         MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
313
314         return platform_driver_register(&max14577_regulator_driver);
315 }
316 subsys_initcall(max14577_regulator_init);
317
318 static void __exit max14577_regulator_exit(void)
319 {
320         platform_driver_unregister(&max14577_regulator_driver);
321 }
322 module_exit(max14577_regulator_exit);
323
324 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
325 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
326 MODULE_LICENSE("GPL");
327 MODULE_ALIAS("platform:max14577-regulator");