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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * max8907.c - mfd driver for MAX8907
4 *
5 * Copyright (C) 2010 Gyungoh Yoo <[email protected]>
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/regmap.h>
19#include <linux/slab.h>
20
21static const struct mfd_cell max8907_cells[] = {
22 { .name = "max8907-regulator", },
23 { .name = "max8907-rtc", },
24};
25
26static 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
41static 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
54static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
55{
56 return !max8907_gen_is_volatile_reg(dev, reg);
57}
58
59static 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,
66 .cache_type = REGCACHE_MAPLE,
67};
68
69static 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
83static 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
93static 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
104static 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,
111 .cache_type = REGCACHE_MAPLE,
112};
113
114static 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
128static 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
139static 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
152static 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
162static const struct regmap_irq max8907_rtc_irqs[] = {
163 { .reg_offset = 0, .mask = 1 << 2, },
164 { .reg_offset = 0, .mask = 1 << 3, },
165};
166
167static 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
176static struct max8907 *max8907_pm_off;
177static 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
183static int max8907_i2c_probe(struct i2c_client *i2c)
184{
185 struct max8907 *max8907;
186 int ret;
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");
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;
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
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);
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
227 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
228 IRQF_ONESHOT | IRQF_SHARED,
229 -1, &max8907_chg_irq_chip,
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
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
259 if (pm_off && !pm_power_off) {
260 max8907_pm_off = max8907;
261 pm_power_off = max8907_power_off;
262 }
263
264 return 0;
265
266err_add_devices:
267 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
268err_irqc_rtc:
269 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
270err_irqc_on_off:
271 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
272err_irqc_chg:
273err_regmap_rtc:
274 i2c_unregister_device(max8907->i2c_rtc);
275err_dummy_rtc:
276err_regmap_gen:
277err_alloc_drvdata:
278 return ret;
279}
280
281static void max8907_i2c_remove(struct i2c_client *i2c)
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);
292}
293
294#ifdef CONFIG_OF
295static const struct of_device_id max8907_of_match[] = {
296 { .compatible = "maxim,max8907" },
297 { },
298};
299MODULE_DEVICE_TABLE(of, max8907_of_match);
300#endif
301
302static const struct i2c_device_id max8907_i2c_id[] = {
303 { "max8907" },
304 {}
305};
306MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
307
308static struct i2c_driver max8907_i2c_driver = {
309 .driver = {
310 .name = "max8907",
311 .of_match_table = of_match_ptr(max8907_of_match),
312 },
313 .probe = max8907_i2c_probe,
314 .remove = max8907_i2c_remove,
315 .id_table = max8907_i2c_id,
316};
317
318static 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}
328subsys_initcall(max8907_i2c_init);
329
330static void __exit max8907_i2c_exit(void)
331{
332 i2c_del_driver(&max8907_i2c_driver);
333}
334module_exit(max8907_i2c_exit);
335
336MODULE_DESCRIPTION("MAX8907 multi-function core driver");
337MODULE_AUTHOR("Gyungoh Yoo <[email protected]>");
338MODULE_LICENSE("GPL v2");