2 * max8907.c - mfd driver for MAX8907
4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
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.
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>
24 static struct mfd_cell max8907_cells[] = {
25 { .name = "max8907-regulator", },
26 { .name = "max8907-rtc", },
29 static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int 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:
44 static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int 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:
57 static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
59 return !max8907_gen_is_volatile_reg(dev, reg);
62 static const struct regmap_config max8907_regmap_gen_config = {
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,
72 static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
74 if (reg <= MAX8907_REG_RTC_YEAR2)
78 case MAX8907_REG_RTC_STATUS:
79 case MAX8907_REG_RTC_IRQ:
86 static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
89 case MAX8907_REG_RTC_IRQ:
96 static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
99 case MAX8907_REG_RTC_STATUS:
100 case MAX8907_REG_RTC_IRQ:
107 static const struct regmap_config max8907_regmap_rtc_config = {
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,
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, },
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,
138 .irqs = max8907_chg_irqs,
139 .num_irqs = ARRAY_SIZE(max8907_chg_irqs),
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, },
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,
161 .irqs = max8907_on_off_irqs,
162 .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
165 static const struct regmap_irq max8907_rtc_irqs[] = {
166 { .reg_offset = 0, .mask = 1 << 2, },
167 { .reg_offset = 0, .mask = 1 << 3, },
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,
175 .irqs = max8907_rtc_irqs,
176 .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
179 static struct max8907 *max8907_pm_off;
180 static void max8907_power_off(void)
182 regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
183 MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
186 static int max8907_i2c_probe(struct i2c_client *i2c,
187 const struct i2c_device_id *id)
189 struct max8907 *max8907;
191 struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
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");
200 max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
203 goto err_alloc_drvdata;
206 max8907->dev = &i2c->dev;
207 dev_set_drvdata(max8907->dev, max8907);
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);
219 max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
220 if (!max8907->i2c_rtc) {
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);
233 irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
235 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
236 IRQF_ONESHOT | IRQF_SHARED, -1,
237 &max8907_chg_irq_chip,
240 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
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);
248 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
249 goto err_irqc_on_off;
251 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
252 IRQF_ONESHOT | IRQF_SHARED, -1,
253 &max8907_rtc_irq_chip,
256 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
260 enable_irq(max8907->i2c_gen->irq);
262 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
263 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
265 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
266 goto err_add_devices;
269 if (pm_off && !pm_power_off) {
270 max8907_pm_off = max8907;
271 pm_power_off = max8907_power_off;
277 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
279 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
281 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
284 i2c_unregister_device(max8907->i2c_rtc);
291 static int max8907_i2c_remove(struct i2c_client *i2c)
293 struct max8907 *max8907 = i2c_get_clientdata(i2c);
295 mfd_remove_devices(max8907->dev);
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);
301 i2c_unregister_device(max8907->i2c_rtc);
307 static struct of_device_id max8907_of_match[] = {
308 { .compatible = "maxim,max8907" },
311 MODULE_DEVICE_TABLE(of, max8907_of_match);
314 static const struct i2c_device_id max8907_i2c_id[] = {
318 MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
320 static struct i2c_driver max8907_i2c_driver = {
323 .owner = THIS_MODULE,
324 .of_match_table = of_match_ptr(max8907_of_match),
326 .probe = max8907_i2c_probe,
327 .remove = max8907_i2c_remove,
328 .id_table = max8907_i2c_id,
331 static int __init max8907_i2c_init(void)
335 ret = i2c_add_driver(&max8907_i2c_driver);
337 pr_err("Failed to register I2C driver: %d\n", ret);
341 subsys_initcall(max8907_i2c_init);
343 static void __exit max8907_i2c_exit(void)
345 i2c_del_driver(&max8907_i2c_driver);
347 module_exit(max8907_i2c_exit);
349 MODULE_DESCRIPTION("MAX8907 multi-function core driver");
350 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
351 MODULE_LICENSE("GPL v2");