Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a91d2f8d GY |
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. | |
a91d2f8d GY |
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> | |
e4081da4 | 17 | #include <linux/of.h> |
a91d2f8d GY |
18 | #include <linux/regmap.h> |
19 | #include <linux/slab.h> | |
20 | ||
7c0517b1 | 21 | static const struct mfd_cell max8907_cells[] = { |
a91d2f8d GY |
22 | { .name = "max8907-regulator", }, |
23 | { .name = "max8907-rtc", }, | |
24 | }; | |
25 | ||
26 | static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg) | |
27 | { | |
28 | switch (reg) { | |
29 | case MAX8907_REG_ON_OFF_IRQ1: | |
30 | case MAX8907_REG_ON_OFF_STAT: | |
31 | case MAX8907_REG_ON_OFF_IRQ2: | |
32 | case MAX8907_REG_CHG_IRQ1: | |
33 | case MAX8907_REG_CHG_IRQ2: | |
34 | case MAX8907_REG_CHG_STAT: | |
35 | return true; | |
36 | default: | |
37 | return false; | |
38 | } | |
39 | } | |
40 | ||
41 | static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg) | |
42 | { | |
43 | switch (reg) { | |
44 | case MAX8907_REG_ON_OFF_IRQ1: | |
45 | case MAX8907_REG_ON_OFF_IRQ2: | |
46 | case MAX8907_REG_CHG_IRQ1: | |
47 | case MAX8907_REG_CHG_IRQ2: | |
48 | return true; | |
49 | default: | |
50 | return false; | |
51 | } | |
52 | } | |
53 | ||
54 | static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg) | |
55 | { | |
56 | return !max8907_gen_is_volatile_reg(dev, reg); | |
57 | } | |
58 | ||
59 | static const struct regmap_config max8907_regmap_gen_config = { | |
60 | .reg_bits = 8, | |
61 | .val_bits = 8, | |
62 | .volatile_reg = max8907_gen_is_volatile_reg, | |
63 | .precious_reg = max8907_gen_is_precious_reg, | |
64 | .writeable_reg = max8907_gen_is_writeable_reg, | |
65 | .max_register = MAX8907_REG_LDO20VOUT, | |
4fddf148 | 66 | .cache_type = REGCACHE_MAPLE, |
a91d2f8d GY |
67 | }; |
68 | ||
69 | static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg) | |
70 | { | |
71 | if (reg <= MAX8907_REG_RTC_YEAR2) | |
72 | return true; | |
73 | ||
74 | switch (reg) { | |
75 | case MAX8907_REG_RTC_STATUS: | |
76 | case MAX8907_REG_RTC_IRQ: | |
77 | return true; | |
78 | default: | |
79 | return false; | |
80 | } | |
81 | } | |
82 | ||
83 | static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg) | |
84 | { | |
85 | switch (reg) { | |
86 | case MAX8907_REG_RTC_IRQ: | |
87 | return true; | |
88 | default: | |
89 | return false; | |
90 | } | |
91 | } | |
92 | ||
93 | static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg) | |
94 | { | |
95 | switch (reg) { | |
96 | case MAX8907_REG_RTC_STATUS: | |
97 | case MAX8907_REG_RTC_IRQ: | |
98 | return false; | |
99 | default: | |
100 | return true; | |
101 | } | |
102 | } | |
103 | ||
104 | static const struct regmap_config max8907_regmap_rtc_config = { | |
105 | .reg_bits = 8, | |
106 | .val_bits = 8, | |
107 | .volatile_reg = max8907_rtc_is_volatile_reg, | |
108 | .precious_reg = max8907_rtc_is_precious_reg, | |
109 | .writeable_reg = max8907_rtc_is_writeable_reg, | |
110 | .max_register = MAX8907_REG_MPL_CNTL, | |
4fddf148 | 111 | .cache_type = REGCACHE_MAPLE, |
a91d2f8d GY |
112 | }; |
113 | ||
114 | static const struct regmap_irq max8907_chg_irqs[] = { | |
115 | { .reg_offset = 0, .mask = 1 << 0, }, | |
116 | { .reg_offset = 0, .mask = 1 << 1, }, | |
117 | { .reg_offset = 0, .mask = 1 << 2, }, | |
118 | { .reg_offset = 1, .mask = 1 << 0, }, | |
119 | { .reg_offset = 1, .mask = 1 << 1, }, | |
120 | { .reg_offset = 1, .mask = 1 << 2, }, | |
121 | { .reg_offset = 1, .mask = 1 << 3, }, | |
122 | { .reg_offset = 1, .mask = 1 << 4, }, | |
123 | { .reg_offset = 1, .mask = 1 << 5, }, | |
124 | { .reg_offset = 1, .mask = 1 << 6, }, | |
125 | { .reg_offset = 1, .mask = 1 << 7, }, | |
126 | }; | |
127 | ||
128 | static const struct regmap_irq_chip max8907_chg_irq_chip = { | |
129 | .name = "max8907 chg", | |
130 | .status_base = MAX8907_REG_CHG_IRQ1, | |
131 | .mask_base = MAX8907_REG_CHG_IRQ1_MASK, | |
132 | .wake_base = MAX8907_REG_CHG_IRQ1_MASK, | |
133 | .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1, | |
134 | .num_regs = 2, | |
135 | .irqs = max8907_chg_irqs, | |
136 | .num_irqs = ARRAY_SIZE(max8907_chg_irqs), | |
137 | }; | |
138 | ||
139 | static const struct regmap_irq max8907_on_off_irqs[] = { | |
140 | { .reg_offset = 0, .mask = 1 << 0, }, | |
141 | { .reg_offset = 0, .mask = 1 << 1, }, | |
142 | { .reg_offset = 0, .mask = 1 << 2, }, | |
143 | { .reg_offset = 0, .mask = 1 << 3, }, | |
144 | { .reg_offset = 0, .mask = 1 << 4, }, | |
145 | { .reg_offset = 0, .mask = 1 << 5, }, | |
146 | { .reg_offset = 0, .mask = 1 << 6, }, | |
147 | { .reg_offset = 0, .mask = 1 << 7, }, | |
148 | { .reg_offset = 1, .mask = 1 << 0, }, | |
149 | { .reg_offset = 1, .mask = 1 << 1, }, | |
150 | }; | |
151 | ||
152 | static const struct regmap_irq_chip max8907_on_off_irq_chip = { | |
153 | .name = "max8907 on_off", | |
154 | .status_base = MAX8907_REG_ON_OFF_IRQ1, | |
155 | .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK, | |
156 | .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1, | |
157 | .num_regs = 2, | |
158 | .irqs = max8907_on_off_irqs, | |
159 | .num_irqs = ARRAY_SIZE(max8907_on_off_irqs), | |
160 | }; | |
161 | ||
162 | static const struct regmap_irq max8907_rtc_irqs[] = { | |
163 | { .reg_offset = 0, .mask = 1 << 2, }, | |
164 | { .reg_offset = 0, .mask = 1 << 3, }, | |
165 | }; | |
166 | ||
167 | static const struct regmap_irq_chip max8907_rtc_irq_chip = { | |
168 | .name = "max8907 rtc", | |
169 | .status_base = MAX8907_REG_RTC_IRQ, | |
170 | .mask_base = MAX8907_REG_RTC_IRQ_MASK, | |
171 | .num_regs = 1, | |
172 | .irqs = max8907_rtc_irqs, | |
173 | .num_irqs = ARRAY_SIZE(max8907_rtc_irqs), | |
174 | }; | |
175 | ||
0f471916 | 176 | static struct max8907 *max8907_pm_off; |
9582fdcb SW |
177 | static void max8907_power_off(void) |
178 | { | |
179 | regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG, | |
180 | MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF); | |
181 | } | |
182 | ||
bab90bb2 | 183 | static int max8907_i2c_probe(struct i2c_client *i2c) |
a91d2f8d GY |
184 | { |
185 | struct max8907 *max8907; | |
186 | int ret; | |
9582fdcb SW |
187 | struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev); |
188 | bool pm_off = false; | |
189 | ||
190 | if (pdata) | |
191 | pm_off = pdata->pm_off; | |
192 | else if (i2c->dev.of_node) | |
193 | pm_off = of_property_read_bool(i2c->dev.of_node, | |
194 | "maxim,system-power-controller"); | |
a91d2f8d GY |
195 | |
196 | max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL); | |
197 | if (!max8907) { | |
198 | ret = -ENOMEM; | |
199 | goto err_alloc_drvdata; | |
200 | } | |
201 | ||
202 | max8907->dev = &i2c->dev; | |
a91d2f8d GY |
203 | max8907->i2c_gen = i2c; |
204 | i2c_set_clientdata(i2c, max8907); | |
205 | max8907->regmap_gen = devm_regmap_init_i2c(i2c, | |
206 | &max8907_regmap_gen_config); | |
207 | if (IS_ERR(max8907->regmap_gen)) { | |
208 | ret = PTR_ERR(max8907->regmap_gen); | |
209 | dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret); | |
210 | goto err_regmap_gen; | |
211 | } | |
212 | ||
b8afcd54 WS |
213 | max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR); |
214 | if (IS_ERR(max8907->i2c_rtc)) { | |
215 | ret = PTR_ERR(max8907->i2c_rtc); | |
a91d2f8d GY |
216 | goto err_dummy_rtc; |
217 | } | |
218 | i2c_set_clientdata(max8907->i2c_rtc, max8907); | |
219 | max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc, | |
220 | &max8907_regmap_rtc_config); | |
221 | if (IS_ERR(max8907->regmap_rtc)) { | |
222 | ret = PTR_ERR(max8907->regmap_rtc); | |
223 | dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret); | |
224 | goto err_regmap_rtc; | |
225 | } | |
226 | ||
a91d2f8d | 227 | ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, |
184b69c5 | 228 | IRQF_ONESHOT | IRQF_SHARED, |
bd8a0974 | 229 | -1, &max8907_chg_irq_chip, |
a91d2f8d GY |
230 | &max8907->irqc_chg); |
231 | if (ret != 0) { | |
232 | dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret); | |
233 | goto err_irqc_chg; | |
234 | } | |
235 | ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq, | |
236 | IRQF_ONESHOT | IRQF_SHARED, -1, | |
237 | &max8907_on_off_irq_chip, | |
238 | &max8907->irqc_on_off); | |
239 | if (ret != 0) { | |
240 | dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret); | |
241 | goto err_irqc_on_off; | |
242 | } | |
243 | ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq, | |
244 | IRQF_ONESHOT | IRQF_SHARED, -1, | |
245 | &max8907_rtc_irq_chip, | |
246 | &max8907->irqc_rtc); | |
247 | if (ret != 0) { | |
248 | dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret); | |
249 | goto err_irqc_rtc; | |
250 | } | |
251 | ||
a91d2f8d GY |
252 | ret = mfd_add_devices(max8907->dev, -1, max8907_cells, |
253 | ARRAY_SIZE(max8907_cells), NULL, 0, NULL); | |
254 | if (ret != 0) { | |
255 | dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret); | |
256 | goto err_add_devices; | |
257 | } | |
258 | ||
9582fdcb SW |
259 | if (pm_off && !pm_power_off) { |
260 | max8907_pm_off = max8907; | |
261 | pm_power_off = max8907_power_off; | |
262 | } | |
263 | ||
a91d2f8d GY |
264 | return 0; |
265 | ||
266 | err_add_devices: | |
267 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); | |
268 | err_irqc_rtc: | |
269 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); | |
270 | err_irqc_on_off: | |
271 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); | |
272 | err_irqc_chg: | |
273 | err_regmap_rtc: | |
274 | i2c_unregister_device(max8907->i2c_rtc); | |
275 | err_dummy_rtc: | |
276 | err_regmap_gen: | |
277 | err_alloc_drvdata: | |
278 | return ret; | |
279 | } | |
280 | ||
ed5c2f5f | 281 | static void max8907_i2c_remove(struct i2c_client *i2c) |
a91d2f8d GY |
282 | { |
283 | struct max8907 *max8907 = i2c_get_clientdata(i2c); | |
284 | ||
285 | mfd_remove_devices(max8907->dev); | |
286 | ||
287 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc); | |
288 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off); | |
289 | regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg); | |
290 | ||
291 | i2c_unregister_device(max8907->i2c_rtc); | |
a91d2f8d GY |
292 | } |
293 | ||
294 | #ifdef CONFIG_OF | |
488e9003 | 295 | static const struct of_device_id max8907_of_match[] = { |
a91d2f8d GY |
296 | { .compatible = "maxim,max8907" }, |
297 | { }, | |
298 | }; | |
299 | MODULE_DEVICE_TABLE(of, max8907_of_match); | |
300 | #endif | |
301 | ||
302 | static const struct i2c_device_id max8907_i2c_id[] = { | |
303 | {"max8907", 0}, | |
304 | {} | |
305 | }; | |
306 | MODULE_DEVICE_TABLE(i2c, max8907_i2c_id); | |
307 | ||
308 | static struct i2c_driver max8907_i2c_driver = { | |
309 | .driver = { | |
310 | .name = "max8907", | |
a91d2f8d GY |
311 | .of_match_table = of_match_ptr(max8907_of_match), |
312 | }, | |
9816d859 | 313 | .probe = max8907_i2c_probe, |
a91d2f8d GY |
314 | .remove = max8907_i2c_remove, |
315 | .id_table = max8907_i2c_id, | |
316 | }; | |
317 | ||
318 | static int __init max8907_i2c_init(void) | |
319 | { | |
320 | int ret = -ENODEV; | |
321 | ||
322 | ret = i2c_add_driver(&max8907_i2c_driver); | |
323 | if (ret != 0) | |
324 | pr_err("Failed to register I2C driver: %d\n", ret); | |
325 | ||
326 | return ret; | |
327 | } | |
328 | subsys_initcall(max8907_i2c_init); | |
329 | ||
330 | static void __exit max8907_i2c_exit(void) | |
331 | { | |
332 | i2c_del_driver(&max8907_i2c_driver); | |
333 | } | |
334 | module_exit(max8907_i2c_exit); | |
335 | ||
336 | MODULE_DESCRIPTION("MAX8907 multi-function core driver"); | |
337 | MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>"); | |
338 | MODULE_LICENSE("GPL v2"); |