1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * max8907.c - mfd driver for MAX8907
4 *
5 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
6 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
7 */
8
9 #include <linux/err.h>
10 #include <linux/i2c.h>
11 #include <linux/init.h>
12 #include <linux/interrupt.h>
13 #include <linux/irq.h>
14 #include <linux/mfd/core.h>
15 #include <linux/mfd/max8907.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/of_device.h>
19 #include <linux/regmap.h>
20 #include <linux/slab.h>
21
22 static const struct mfd_cell max8907_cells[] = {
23 { .name = "max8907-regulator", },
24 { .name = "max8907-rtc", },
25 };
26
max8907_gen_is_volatile_reg(struct device * dev,unsigned int reg)27 static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
28 {
29 switch (reg) {
30 case MAX8907_REG_ON_OFF_IRQ1:
31 case MAX8907_REG_ON_OFF_STAT:
32 case MAX8907_REG_ON_OFF_IRQ2:
33 case MAX8907_REG_CHG_IRQ1:
34 case MAX8907_REG_CHG_IRQ2:
35 case MAX8907_REG_CHG_STAT:
36 return true;
37 default:
38 return false;
39 }
40 }
41
max8907_gen_is_precious_reg(struct device * dev,unsigned int reg)42 static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
43 {
44 switch (reg) {
45 case MAX8907_REG_ON_OFF_IRQ1:
46 case MAX8907_REG_ON_OFF_IRQ2:
47 case MAX8907_REG_CHG_IRQ1:
48 case MAX8907_REG_CHG_IRQ2:
49 return true;
50 default:
51 return false;
52 }
53 }
54
max8907_gen_is_writeable_reg(struct device * dev,unsigned int reg)55 static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
56 {
57 return !max8907_gen_is_volatile_reg(dev, reg);
58 }
59
60 static const struct regmap_config max8907_regmap_gen_config = {
61 .reg_bits = 8,
62 .val_bits = 8,
63 .volatile_reg = max8907_gen_is_volatile_reg,
64 .precious_reg = max8907_gen_is_precious_reg,
65 .writeable_reg = max8907_gen_is_writeable_reg,
66 .max_register = MAX8907_REG_LDO20VOUT,
67 .cache_type = REGCACHE_RBTREE,
68 };
69
max8907_rtc_is_volatile_reg(struct device * dev,unsigned int reg)70 static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
71 {
72 if (reg <= MAX8907_REG_RTC_YEAR2)
73 return true;
74
75 switch (reg) {
76 case MAX8907_REG_RTC_STATUS:
77 case MAX8907_REG_RTC_IRQ:
78 return true;
79 default:
80 return false;
81 }
82 }
83
max8907_rtc_is_precious_reg(struct device * dev,unsigned int reg)84 static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
85 {
86 switch (reg) {
87 case MAX8907_REG_RTC_IRQ:
88 return true;
89 default:
90 return false;
91 }
92 }
93
max8907_rtc_is_writeable_reg(struct device * dev,unsigned int reg)94 static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
95 {
96 switch (reg) {
97 case MAX8907_REG_RTC_STATUS:
98 case MAX8907_REG_RTC_IRQ:
99 return false;
100 default:
101 return true;
102 }
103 }
104
105 static const struct regmap_config max8907_regmap_rtc_config = {
106 .reg_bits = 8,
107 .val_bits = 8,
108 .volatile_reg = max8907_rtc_is_volatile_reg,
109 .precious_reg = max8907_rtc_is_precious_reg,
110 .writeable_reg = max8907_rtc_is_writeable_reg,
111 .max_register = MAX8907_REG_MPL_CNTL,
112 .cache_type = REGCACHE_RBTREE,
113 };
114
115 static const struct regmap_irq max8907_chg_irqs[] = {
116 { .reg_offset = 0, .mask = 1 << 0, },
117 { .reg_offset = 0, .mask = 1 << 1, },
118 { .reg_offset = 0, .mask = 1 << 2, },
119 { .reg_offset = 1, .mask = 1 << 0, },
120 { .reg_offset = 1, .mask = 1 << 1, },
121 { .reg_offset = 1, .mask = 1 << 2, },
122 { .reg_offset = 1, .mask = 1 << 3, },
123 { .reg_offset = 1, .mask = 1 << 4, },
124 { .reg_offset = 1, .mask = 1 << 5, },
125 { .reg_offset = 1, .mask = 1 << 6, },
126 { .reg_offset = 1, .mask = 1 << 7, },
127 };
128
129 static const struct regmap_irq_chip max8907_chg_irq_chip = {
130 .name = "max8907 chg",
131 .status_base = MAX8907_REG_CHG_IRQ1,
132 .mask_base = MAX8907_REG_CHG_IRQ1_MASK,
133 .wake_base = MAX8907_REG_CHG_IRQ1_MASK,
134 .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
135 .num_regs = 2,
136 .irqs = max8907_chg_irqs,
137 .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
138 };
139
140 static const struct regmap_irq max8907_on_off_irqs[] = {
141 { .reg_offset = 0, .mask = 1 << 0, },
142 { .reg_offset = 0, .mask = 1 << 1, },
143 { .reg_offset = 0, .mask = 1 << 2, },
144 { .reg_offset = 0, .mask = 1 << 3, },
145 { .reg_offset = 0, .mask = 1 << 4, },
146 { .reg_offset = 0, .mask = 1 << 5, },
147 { .reg_offset = 0, .mask = 1 << 6, },
148 { .reg_offset = 0, .mask = 1 << 7, },
149 { .reg_offset = 1, .mask = 1 << 0, },
150 { .reg_offset = 1, .mask = 1 << 1, },
151 };
152
153 static const struct regmap_irq_chip max8907_on_off_irq_chip = {
154 .name = "max8907 on_off",
155 .status_base = MAX8907_REG_ON_OFF_IRQ1,
156 .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
157 .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
158 .num_regs = 2,
159 .irqs = max8907_on_off_irqs,
160 .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
161 };
162
163 static const struct regmap_irq max8907_rtc_irqs[] = {
164 { .reg_offset = 0, .mask = 1 << 2, },
165 { .reg_offset = 0, .mask = 1 << 3, },
166 };
167
168 static const struct regmap_irq_chip max8907_rtc_irq_chip = {
169 .name = "max8907 rtc",
170 .status_base = MAX8907_REG_RTC_IRQ,
171 .mask_base = MAX8907_REG_RTC_IRQ_MASK,
172 .num_regs = 1,
173 .irqs = max8907_rtc_irqs,
174 .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
175 };
176
177 static struct max8907 *max8907_pm_off;
max8907_power_off(void)178 static void max8907_power_off(void)
179 {
180 regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
181 MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
182 }
183
max8907_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)184 static int max8907_i2c_probe(struct i2c_client *i2c,
185 const struct i2c_device_id *id)
186 {
187 struct max8907 *max8907;
188 int ret;
189 struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
190 bool pm_off = false;
191
192 if (pdata)
193 pm_off = pdata->pm_off;
194 else if (i2c->dev.of_node)
195 pm_off = of_property_read_bool(i2c->dev.of_node,
196 "maxim,system-power-controller");
197
198 max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
199 if (!max8907) {
200 ret = -ENOMEM;
201 goto err_alloc_drvdata;
202 }
203
204 max8907->dev = &i2c->dev;
205 dev_set_drvdata(max8907->dev, max8907);
206
207 max8907->i2c_gen = i2c;
208 i2c_set_clientdata(i2c, max8907);
209 max8907->regmap_gen = devm_regmap_init_i2c(i2c,
210 &max8907_regmap_gen_config);
211 if (IS_ERR(max8907->regmap_gen)) {
212 ret = PTR_ERR(max8907->regmap_gen);
213 dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
214 goto err_regmap_gen;
215 }
216
217 max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR);
218 if (IS_ERR(max8907->i2c_rtc)) {
219 ret = PTR_ERR(max8907->i2c_rtc);
220 goto err_dummy_rtc;
221 }
222 i2c_set_clientdata(max8907->i2c_rtc, max8907);
223 max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
224 &max8907_regmap_rtc_config);
225 if (IS_ERR(max8907->regmap_rtc)) {
226 ret = PTR_ERR(max8907->regmap_rtc);
227 dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
228 goto err_regmap_rtc;
229 }
230
231 irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
232
233 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
234 IRQF_ONESHOT | IRQF_SHARED, -1,
235 &max8907_chg_irq_chip,
236 &max8907->irqc_chg);
237 if (ret != 0) {
238 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
239 goto err_irqc_chg;
240 }
241 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
242 IRQF_ONESHOT | IRQF_SHARED, -1,
243 &max8907_on_off_irq_chip,
244 &max8907->irqc_on_off);
245 if (ret != 0) {
246 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
247 goto err_irqc_on_off;
248 }
249 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
250 IRQF_ONESHOT | IRQF_SHARED, -1,
251 &max8907_rtc_irq_chip,
252 &max8907->irqc_rtc);
253 if (ret != 0) {
254 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
255 goto err_irqc_rtc;
256 }
257
258 enable_irq(max8907->i2c_gen->irq);
259
260 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
261 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
262 if (ret != 0) {
263 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
264 goto err_add_devices;
265 }
266
267 if (pm_off && !pm_power_off) {
268 max8907_pm_off = max8907;
269 pm_power_off = max8907_power_off;
270 }
271
272 return 0;
273
274 err_add_devices:
275 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
276 err_irqc_rtc:
277 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
278 err_irqc_on_off:
279 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
280 err_irqc_chg:
281 err_regmap_rtc:
282 i2c_unregister_device(max8907->i2c_rtc);
283 err_dummy_rtc:
284 err_regmap_gen:
285 err_alloc_drvdata:
286 return ret;
287 }
288
max8907_i2c_remove(struct i2c_client * i2c)289 static int max8907_i2c_remove(struct i2c_client *i2c)
290 {
291 struct max8907 *max8907 = i2c_get_clientdata(i2c);
292
293 mfd_remove_devices(max8907->dev);
294
295 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
296 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
297 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
298
299 i2c_unregister_device(max8907->i2c_rtc);
300
301 return 0;
302 }
303
304 #ifdef CONFIG_OF
305 static const struct of_device_id max8907_of_match[] = {
306 { .compatible = "maxim,max8907" },
307 { },
308 };
309 MODULE_DEVICE_TABLE(of, max8907_of_match);
310 #endif
311
312 static const struct i2c_device_id max8907_i2c_id[] = {
313 {"max8907", 0},
314 {}
315 };
316 MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
317
318 static struct i2c_driver max8907_i2c_driver = {
319 .driver = {
320 .name = "max8907",
321 .of_match_table = of_match_ptr(max8907_of_match),
322 },
323 .probe = max8907_i2c_probe,
324 .remove = max8907_i2c_remove,
325 .id_table = max8907_i2c_id,
326 };
327
max8907_i2c_init(void)328 static int __init max8907_i2c_init(void)
329 {
330 int ret = -ENODEV;
331
332 ret = i2c_add_driver(&max8907_i2c_driver);
333 if (ret != 0)
334 pr_err("Failed to register I2C driver: %d\n", ret);
335
336 return ret;
337 }
338 subsys_initcall(max8907_i2c_init);
339
max8907_i2c_exit(void)340 static void __exit max8907_i2c_exit(void)
341 {
342 i2c_del_driver(&max8907_i2c_driver);
343 }
344 module_exit(max8907_i2c_exit);
345
346 MODULE_DESCRIPTION("MAX8907 multi-function core driver");
347 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
348 MODULE_LICENSE("GPL v2");
349
