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a91d2f8d GY |
1 | /* |
2 | * max8907.c - mfd driver for MAX8907 | |
3 | * | |
4 | * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com> | |
5 | * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/err.h> | |
13 | #include <linux/i2c.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irq.h> | |
17 | #include <linux/mfd/core.h> | |
18 | #include <linux/mfd/max8907.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/of_device.h> | |
21 | #include <linux/regmap.h> | |
22 | #include <linux/slab.h> | |
23 | ||
24 | static struct mfd_cell max8907_cells[] = { | |
25 | { .name = "max8907-regulator", }, | |
26 | { .name = "max8907-rtc", }, | |
27 | }; | |
28 | ||
29 | static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg) | |
30 | { | |
31 | switch (reg) { | |
32 | case MAX8907_REG_ON_OFF_IRQ1: | |
33 | case MAX8907_REG_ON_OFF_STAT: | |
34 | case MAX8907_REG_ON_OFF_IRQ2: | |
35 | case MAX8907_REG_CHG_IRQ1: | |
36 | case MAX8907_REG_CHG_IRQ2: | |
37 | case MAX8907_REG_CHG_STAT: | |
38 | return true; | |
39 | default: | |
40 | return false; | |
41 | } | |
42 | } | |
43 | ||
44 | static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg) | |
45 | { | |
46 | switch (reg) { | |
47 | case MAX8907_REG_ON_OFF_IRQ1: | |
48 | case MAX8907_REG_ON_OFF_IRQ2: | |
49 | case MAX8907_REG_CHG_IRQ1: | |
50 | case MAX8907_REG_CHG_IRQ2: | |
51 | return true; | |
52 | default: | |
53 | return false; | |
54 | } | |
55 | } | |
56 | ||
57 | static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg) | |
58 | { | |
59 | return !max8907_gen_is_volatile_reg(dev, reg); | |
60 | } | |
61 | ||
62 | static const struct regmap_config max8907_regmap_gen_config = { | |
63 | .reg_bits = 8, | |
64 | .val_bits = 8, | |
65 | .volatile_reg = max8907_gen_is_volatile_reg, | |
66 | .precious_reg = max8907_gen_is_precious_reg, | |
67 | .writeable_reg = max8907_gen_is_writeable_reg, | |
68 | .max_register = MAX8907_REG_LDO20VOUT, | |
69 | .cache_type = REGCACHE_RBTREE, | |
70 | }; | |
71 | ||
72 | static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg) | |
73 | { | |
74 | if (reg <= MAX8907_REG_RTC_YEAR2) | |
75 | return true; | |
76 | ||
77 | switch (reg) { | |
78 | case MAX8907_REG_RTC_STATUS: | |
79 | case MAX8907_REG_RTC_IRQ: | |
80 | return true; | |
81 | default: | |
82 | return false; | |
83 | } | |
84 | } | |
85 | ||
86 | static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg) | |
87 | { | |
88 | switch (reg) { | |
89 | case MAX8907_REG_RTC_IRQ: | |
90 | return true; | |
91 | default: | |
92 | return false; | |
93 | } | |
94 | } | |
95 | ||
96 | static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg) | |
97 | { | |
98 | switch (reg) { | |
99 | case MAX8907_REG_RTC_STATUS: | |
100 | case MAX8907_REG_RTC_IRQ: | |
101 | return false; | |
102 | default: | |
103 | return true; | |
104 | } | |
105 | } | |
106 | ||
107 | static const struct regmap_config max8907_regmap_rtc_config = { | |
108 | .reg_bits = 8, | |
109 | .val_bits = 8, | |
110 | .volatile_reg = max8907_rtc_is_volatile_reg, | |
111 | .precious_reg = max8907_rtc_is_precious_reg, | |
112 | .writeable_reg = max8907_rtc_is_writeable_reg, | |
113 | .max_register = MAX8907_REG_MPL_CNTL, | |
114 | .cache_type = REGCACHE_RBTREE, | |
115 | }; | |
116 | ||
117 | static const struct regmap_irq max8907_chg_irqs[] = { | |
118 | { .reg_offset = 0, .mask = 1 << 0, }, | |
119 | { .reg_offset = 0, .mask = 1 << 1, }, | |
120 | { .reg_offset = 0, .mask = 1 << 2, }, | |
121 | { .reg_offset = 1, .mask = 1 << 0, }, | |
122 | { .reg_offset = 1, .mask = 1 << 1, }, | |
123 | { .reg_offset = 1, .mask = 1 << 2, }, | |
124 | { .reg_offset = 1, .mask = 1 << 3, }, | |
125 | { .reg_offset = 1, .mask = 1 << 4, }, | |
126 | { .reg_offset = 1, .mask = 1 << 5, }, | |
127 | { .reg_offset = 1, .mask = 1 << 6, }, | |
128 | { .reg_offset = 1, .mask = 1 << 7, }, | |
129 | }; | |
130 | ||
131 | static const struct regmap_irq_chip max8907_chg_irq_chip = { | |
132 | .name = "max8907 chg", | |
133 | .status_base = MAX8907_REG_CHG_IRQ1, | |
134 | .mask_base = MAX8907_REG_CHG_IRQ1_MASK, | |
135 | .wake_base = MAX8907_REG_CHG_IRQ1_MASK, | |
136 | .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1, | |
137 | .num_regs = 2, | |
138 | .irqs = max8907_chg_irqs, | |
139 | .num_irqs = ARRAY_SIZE(max8907_chg_irqs), | |
140 | }; | |
141 | ||
142 | static const struct regmap_irq max8907_on_off_irqs[] = { | |
143 | { .reg_offset = 0, .mask = 1 << 0, }, | |
144 | { .reg_offset = 0, .mask = 1 << 1, }, | |
145 | { .reg_offset = 0, .mask = 1 << 2, }, | |
146 | { .reg_offset = 0, .mask = 1 << 3, }, | |
147 | { .reg_offset = 0, .mask = 1 << 4, }, | |
148 | { .reg_offset = 0, .mask = 1 << 5, }, | |
149 | { .reg_offset = 0, .mask = 1 << 6, }, | |
150 | { .reg_offset = 0, .mask = 1 << 7, }, | |
151 | { .reg_offset = 1, .mask = 1 << 0, }, | |
152 | { .reg_offset = 1, .mask = 1 << 1, }, | |
153 | }; | |
154 | ||
155 | static const struct regmap_irq_chip max8907_on_off_irq_chip = { | |
156 | .name = "max8907 on_off", | |
157 | .status_base = MAX8907_REG_ON_OFF_IRQ1, | |
158 | .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK, | |
159 | .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1, | |
160 | .num_regs = 2, | |
161 | .irqs = max8907_on_off_irqs, | |
162 | .num_irqs = ARRAY_SIZE(max8907_on_off_irqs), | |
163 | }; | |
164 | ||
165 | static const struct regmap_irq max8907_rtc_irqs[] = { | |
166 | { .reg_offset = 0, .mask = 1 << 2, }, | |
167 | { .reg_offset = 0, .mask = 1 << 3, }, | |
168 | }; | |
169 | ||
170 | static const struct regmap_irq_chip max8907_rtc_irq_chip = { | |
171 | .name = "max8907 rtc", | |
172 | .status_base = MAX8907_REG_RTC_IRQ, | |
173 | .mask_base = MAX8907_REG_RTC_IRQ_MASK, | |
174 | .num_regs = 1, | |
175 | .irqs = max8907_rtc_irqs, | |
176 | .num_irqs = ARRAY_SIZE(max8907_rtc_irqs), | |
177 | }; | |
178 | ||
0f471916 | 179 | static struct max8907 *max8907_pm_off; |
9582fdcb SW |
180 | static void max8907_power_off(void) |
181 | { | |
182 | regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG, | |
183 | MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF); | |
184 | } | |
185 | ||
f791be49 | 186 | static int max8907_i2c_probe(struct i2c_client *i2c, |
a91d2f8d GY |
187 | const struct i2c_device_id *id) |
188 | { | |
189 | struct max8907 *max8907; | |
190 | int ret; | |
9582fdcb SW |
191 | struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev); |
192 | bool pm_off = false; | |
193 | ||
194 | if (pdata) | |
195 | pm_off = pdata->pm_off; | |
196 | else if (i2c->dev.of_node) | |
197 | pm_off = of_property_read_bool(i2c->dev.of_node, | |
198 | "maxim,system-power-controller"); | |
a91d2f8d GY |
199 | |
200 | max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL); | |
201 | if (!max8907) { | |
202 | ret = -ENOMEM; | |
203 | goto err_alloc_drvdata; | |
204 | } | |
205 | ||
206 | max8907->dev = &i2c->dev; | |
207 | dev_set_drvdata(max8907->dev, max8907); | |
208 | ||
209 | max8907->i2c_gen = i2c; | |
210 | i2c_set_clientdata(i2c, max8907); | |
211 | max8907->regmap_gen = devm_regmap_init_i2c(i2c, | |
212 | &max8907_regmap_gen_config); | |
213 | if (IS_ERR(max8907->regmap_gen)) { | |
214 | ret = PTR_ERR(max8907->regmap_gen); | |
215 | dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret); | |
216 | goto err_regmap_gen; | |
217 | } | |
218 | ||
219 | max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR); | |
220 | if (!max8907->i2c_rtc) { | |
221 | ret = -ENOMEM; | |
222 | goto err_dummy_rtc; | |
223 | } | |
224 | i2c_set_clientdata(max8907->i2c_rtc, max8907); | |
225 | max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc, | |
226 | &max8907_regmap_rtc_config); | |
227 | if (IS_ERR(max8907->regmap_rtc)) { | |
228 | ret = PTR_ERR(max8907->regmap_rtc); | |
229 | dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret); | |
230 | goto err_regmap_rtc; | |
231 | } | |
232 | ||
233 | irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN); | |
234 | ||
235 | ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, | |
236 | IRQF_ONESHOT | IRQF_SHARED, -1, | |
237 | &max8907_chg_irq_chip, | |
238 | &max8907->irqc_chg); | |
239 | if (ret != 0) { | |
240 | dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret); | |
241 | goto err_irqc_chg; | |
242 | } | |
243 | ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, | |
244 | IRQF_ONESHOT | IRQF_SHARED, -1, | |
245 | &max8907_on_off_irq_chip, | |
246 | &max8907->irqc_on_off); | |
247 | if (ret != 0) { | |
248 | dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret); | |
249 | goto err_irqc_on_off; | |
250 | } | |
251 | ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq, | |
252 | IRQF_ONESHOT | IRQF_SHARED, -1, | |
253 | &max8907_rtc_irq_chip, | |
254 | &max8907->irqc_rtc); | |
255 | if (ret != 0) { | |
256 | dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret); | |
257 | goto err_irqc_rtc; | |
258 | } | |
259 | ||
260 | enable_irq(max8907->i2c_gen->irq); | |
261 | ||
262 | ret = mfd_add_devices(max8907->dev, -1, max8907_cells, | |
263 | ARRAY_SIZE(max8907_cells), NULL, 0, NULL); | |
264 | if (ret != 0) { | |
265 | dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret); | |
266 | goto err_add_devices; | |
267 | } | |
268 | ||
9582fdcb SW |
269 | if (pm_off && !pm_power_off) { |
270 | max8907_pm_off = max8907; | |
271 | pm_power_off = max8907_power_off; | |
272 | } | |
273 | ||
a91d2f8d GY |
274 | return 0; |
275 | ||
276 | err_add_devices: | |
277 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); | |
278 | err_irqc_rtc: | |
279 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); | |
280 | err_irqc_on_off: | |
281 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); | |
282 | err_irqc_chg: | |
283 | err_regmap_rtc: | |
284 | i2c_unregister_device(max8907->i2c_rtc); | |
285 | err_dummy_rtc: | |
286 | err_regmap_gen: | |
287 | err_alloc_drvdata: | |
288 | return ret; | |
289 | } | |
290 | ||
4740f73f | 291 | static int max8907_i2c_remove(struct i2c_client *i2c) |
a91d2f8d GY |
292 | { |
293 | struct max8907 *max8907 = i2c_get_clientdata(i2c); | |
294 | ||
295 | mfd_remove_devices(max8907->dev); | |
296 | ||
297 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); | |
298 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); | |
299 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); | |
300 | ||
301 | i2c_unregister_device(max8907->i2c_rtc); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | #ifdef CONFIG_OF | |
307 | static struct of_device_id max8907_of_match[] = { | |
308 | { .compatible = "maxim,max8907" }, | |
309 | { }, | |
310 | }; | |
311 | MODULE_DEVICE_TABLE(of, max8907_of_match); | |
312 | #endif | |
313 | ||
314 | static const struct i2c_device_id max8907_i2c_id[] = { | |
315 | {"max8907", 0}, | |
316 | {} | |
317 | }; | |
318 | MODULE_DEVICE_TABLE(i2c, max8907_i2c_id); | |
319 | ||
320 | static struct i2c_driver max8907_i2c_driver = { | |
321 | .driver = { | |
322 | .name = "max8907", | |
323 | .owner = THIS_MODULE, | |
324 | .of_match_table = of_match_ptr(max8907_of_match), | |
325 | }, | |
326 | .probe = max8907_i2c_probe, | |
327 | .remove = max8907_i2c_remove, | |
328 | .id_table = max8907_i2c_id, | |
329 | }; | |
330 | ||
331 | static int __init max8907_i2c_init(void) | |
332 | { | |
333 | int ret = -ENODEV; | |
334 | ||
335 | ret = i2c_add_driver(&max8907_i2c_driver); | |
336 | if (ret != 0) | |
337 | pr_err("Failed to register I2C driver: %d\n", ret); | |
338 | ||
339 | return ret; | |
340 | } | |
341 | subsys_initcall(max8907_i2c_init); | |
342 | ||
343 | static void __exit max8907_i2c_exit(void) | |
344 | { | |
345 | i2c_del_driver(&max8907_i2c_driver); | |
346 | } | |
347 | module_exit(max8907_i2c_exit); | |
348 | ||
349 | MODULE_DESCRIPTION("MAX8907 multi-function core driver"); | |
350 | MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>"); | |
351 | MODULE_LICENSE("GPL v2"); |