1 // SPDX-License-Identifier: GPL-2.0-only
3 * max8907.c - mfd driver for MAX8907
5 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
6 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
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>
18 #include <linux/regmap.h>
19 #include <linux/slab.h>
21 static const struct mfd_cell max8907_cells[] = {
22 { .name = "max8907-regulator", },
23 { .name = "max8907-rtc", },
26 static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int 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:
41 static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int 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:
54 static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
56 return !max8907_gen_is_volatile_reg(dev, reg);
59 static const struct regmap_config max8907_regmap_gen_config = {
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,
69 static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
71 if (reg <= MAX8907_REG_RTC_YEAR2)
75 case MAX8907_REG_RTC_STATUS:
76 case MAX8907_REG_RTC_IRQ:
83 static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
86 case MAX8907_REG_RTC_IRQ:
93 static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
96 case MAX8907_REG_RTC_STATUS:
97 case MAX8907_REG_RTC_IRQ:
104 static const struct regmap_config max8907_regmap_rtc_config = {
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,
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, },
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,
135 .irqs = max8907_chg_irqs,
136 .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
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, },
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,
158 .irqs = max8907_on_off_irqs,
159 .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
162 static const struct regmap_irq max8907_rtc_irqs[] = {
163 { .reg_offset = 0, .mask = 1 << 2, },
164 { .reg_offset = 0, .mask = 1 << 3, },
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,
172 .irqs = max8907_rtc_irqs,
173 .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
176 static struct max8907 *max8907_pm_off;
177 static void max8907_power_off(void)
179 regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
180 MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
183 static int max8907_i2c_probe(struct i2c_client *i2c)
185 struct max8907 *max8907;
187 struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
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");
196 max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
199 goto err_alloc_drvdata;
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);
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);
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);
227 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
228 IRQF_ONESHOT | IRQF_SHARED,
229 -1, &max8907_chg_irq_chip,
232 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
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);
240 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
241 goto err_irqc_on_off;
243 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
244 IRQF_ONESHOT | IRQF_SHARED, -1,
245 &max8907_rtc_irq_chip,
248 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
252 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
253 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
255 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
256 goto err_add_devices;
259 if (pm_off && !pm_power_off) {
260 max8907_pm_off = max8907;
261 pm_power_off = max8907_power_off;
267 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
269 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
271 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
274 i2c_unregister_device(max8907->i2c_rtc);
281 static void max8907_i2c_remove(struct i2c_client *i2c)
283 struct max8907 *max8907 = i2c_get_clientdata(i2c);
285 mfd_remove_devices(max8907->dev);
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);
291 i2c_unregister_device(max8907->i2c_rtc);
295 static const struct of_device_id max8907_of_match[] = {
296 { .compatible = "maxim,max8907" },
299 MODULE_DEVICE_TABLE(of, max8907_of_match);
302 static const struct i2c_device_id max8907_i2c_id[] = {
306 MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
308 static struct i2c_driver max8907_i2c_driver = {
311 .of_match_table = of_match_ptr(max8907_of_match),
313 .probe = max8907_i2c_probe,
314 .remove = max8907_i2c_remove,
315 .id_table = max8907_i2c_id,
318 static int __init max8907_i2c_init(void)
322 ret = i2c_add_driver(&max8907_i2c_driver);
324 pr_err("Failed to register I2C driver: %d\n", ret);
328 subsys_initcall(max8907_i2c_init);
330 static void __exit max8907_i2c_exit(void)
332 i2c_del_driver(&max8907_i2c_driver);
334 module_exit(max8907_i2c_exit);
336 MODULE_DESCRIPTION("MAX8907 multi-function core driver");
337 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
338 MODULE_LICENSE("GPL v2");