Loading...
Note: File does not exist in v3.1.
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
22static const struct mfd_cell max8907_cells[] = {
23 { .name = "max8907-regulator", },
24 { .name = "max8907-rtc", },
25};
26
27static 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
42static 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
55static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
56{
57 return !max8907_gen_is_volatile_reg(dev, reg);
58}
59
60static 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
70static 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
84static 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
94static 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
105static 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
115static 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
129static 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
140static 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
153static 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
163static const struct regmap_irq max8907_rtc_irqs[] = {
164 { .reg_offset = 0, .mask = 1 << 2, },
165 { .reg_offset = 0, .mask = 1 << 3, },
166};
167
168static 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
177static struct max8907 *max8907_pm_off;
178static 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
184static 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 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
232 IRQF_ONESHOT | IRQF_SHARED,
233 -1, &max8907_chg_irq_chip,
234 &max8907->irqc_chg);
235 if (ret != 0) {
236 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
237 goto err_irqc_chg;
238 }
239 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
240 IRQF_ONESHOT | IRQF_SHARED, -1,
241 &max8907_on_off_irq_chip,
242 &max8907->irqc_on_off);
243 if (ret != 0) {
244 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
245 goto err_irqc_on_off;
246 }
247 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
248 IRQF_ONESHOT | IRQF_SHARED, -1,
249 &max8907_rtc_irq_chip,
250 &max8907->irqc_rtc);
251 if (ret != 0) {
252 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
253 goto err_irqc_rtc;
254 }
255
256 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
257 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
258 if (ret != 0) {
259 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
260 goto err_add_devices;
261 }
262
263 if (pm_off && !pm_power_off) {
264 max8907_pm_off = max8907;
265 pm_power_off = max8907_power_off;
266 }
267
268 return 0;
269
270err_add_devices:
271 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
272err_irqc_rtc:
273 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
274err_irqc_on_off:
275 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
276err_irqc_chg:
277err_regmap_rtc:
278 i2c_unregister_device(max8907->i2c_rtc);
279err_dummy_rtc:
280err_regmap_gen:
281err_alloc_drvdata:
282 return ret;
283}
284
285static int max8907_i2c_remove(struct i2c_client *i2c)
286{
287 struct max8907 *max8907 = i2c_get_clientdata(i2c);
288
289 mfd_remove_devices(max8907->dev);
290
291 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
292 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
293 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
294
295 i2c_unregister_device(max8907->i2c_rtc);
296
297 return 0;
298}
299
300#ifdef CONFIG_OF
301static const struct of_device_id max8907_of_match[] = {
302 { .compatible = "maxim,max8907" },
303 { },
304};
305MODULE_DEVICE_TABLE(of, max8907_of_match);
306#endif
307
308static const struct i2c_device_id max8907_i2c_id[] = {
309 {"max8907", 0},
310 {}
311};
312MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
313
314static struct i2c_driver max8907_i2c_driver = {
315 .driver = {
316 .name = "max8907",
317 .of_match_table = of_match_ptr(max8907_of_match),
318 },
319 .probe = max8907_i2c_probe,
320 .remove = max8907_i2c_remove,
321 .id_table = max8907_i2c_id,
322};
323
324static int __init max8907_i2c_init(void)
325{
326 int ret = -ENODEV;
327
328 ret = i2c_add_driver(&max8907_i2c_driver);
329 if (ret != 0)
330 pr_err("Failed to register I2C driver: %d\n", ret);
331
332 return ret;
333}
334subsys_initcall(max8907_i2c_init);
335
336static void __exit max8907_i2c_exit(void)
337{
338 i2c_del_driver(&max8907_i2c_driver);
339}
340module_exit(max8907_i2c_exit);
341
342MODULE_DESCRIPTION("MAX8907 multi-function core driver");
343MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
344MODULE_LICENSE("GPL v2");