1/*
2 * max8907.c - mfd driver for MAX8907
3 *
4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.
6 *
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.
10 */
11
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.h>
21#include <linux/of_device.h>
22#include <linux/regmap.h>
23#include <linux/slab.h>
24
25static const struct mfd_cell max8907_cells[] = {
26	{ .name = "max8907-regulator", },
27	{ .name = "max8907-rtc", },
28};
29
30static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)
31{
32	switch (reg) {
33	case MAX8907_REG_ON_OFF_IRQ1:
34	case MAX8907_REG_ON_OFF_STAT:
35	case MAX8907_REG_ON_OFF_IRQ2:
36	case MAX8907_REG_CHG_IRQ1:
37	case MAX8907_REG_CHG_IRQ2:
38	case MAX8907_REG_CHG_STAT:
39		return true;
40	default:
41		return false;
42	}
43}
44
45static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)
46{
47	switch (reg) {
48	case MAX8907_REG_ON_OFF_IRQ1:
49	case MAX8907_REG_ON_OFF_IRQ2:
50	case MAX8907_REG_CHG_IRQ1:
51	case MAX8907_REG_CHG_IRQ2:
52		return true;
53	default:
54		return false;
55	}
56}
57
58static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)
59{
60	return !max8907_gen_is_volatile_reg(dev, reg);
61}
62
63static const struct regmap_config max8907_regmap_gen_config = {
64	.reg_bits = 8,
65	.val_bits = 8,
66	.volatile_reg = max8907_gen_is_volatile_reg,
67	.precious_reg = max8907_gen_is_precious_reg,
68	.writeable_reg = max8907_gen_is_writeable_reg,
69	.max_register = MAX8907_REG_LDO20VOUT,
70	.cache_type = REGCACHE_RBTREE,
71};
72
73static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
74{
75	if (reg <= MAX8907_REG_RTC_YEAR2)
76		return true;
77
78	switch (reg) {
79	case MAX8907_REG_RTC_STATUS:
80	case MAX8907_REG_RTC_IRQ:
81		return true;
82	default:
83		return false;
84	}
85}
86
87static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)
88{
89	switch (reg) {
90	case MAX8907_REG_RTC_IRQ:
91		return true;
92	default:
93		return false;
94	}
95}
96
97static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)
98{
99	switch (reg) {
100	case MAX8907_REG_RTC_STATUS:
101	case MAX8907_REG_RTC_IRQ:
102		return false;
103	default:
104		return true;
105	}
106}
107
108static const struct regmap_config max8907_regmap_rtc_config = {
109	.reg_bits = 8,
110	.val_bits = 8,
111	.volatile_reg = max8907_rtc_is_volatile_reg,
112	.precious_reg = max8907_rtc_is_precious_reg,
113	.writeable_reg = max8907_rtc_is_writeable_reg,
114	.max_register = MAX8907_REG_MPL_CNTL,
115	.cache_type = REGCACHE_RBTREE,
116};
117
118static const struct regmap_irq max8907_chg_irqs[] = {
119	{ .reg_offset = 0, .mask = 1 << 0, },
120	{ .reg_offset = 0, .mask = 1 << 1, },
121	{ .reg_offset = 0, .mask = 1 << 2, },
122	{ .reg_offset = 1, .mask = 1 << 0, },
123	{ .reg_offset = 1, .mask = 1 << 1, },
124	{ .reg_offset = 1, .mask = 1 << 2, },
125	{ .reg_offset = 1, .mask = 1 << 3, },
126	{ .reg_offset = 1, .mask = 1 << 4, },
127	{ .reg_offset = 1, .mask = 1 << 5, },
128	{ .reg_offset = 1, .mask = 1 << 6, },
129	{ .reg_offset = 1, .mask = 1 << 7, },
130};
131
132static const struct regmap_irq_chip max8907_chg_irq_chip = {
133	.name = "max8907 chg",
134	.status_base = MAX8907_REG_CHG_IRQ1,
135	.mask_base = MAX8907_REG_CHG_IRQ1_MASK,
136	.wake_base = MAX8907_REG_CHG_IRQ1_MASK,
137	.irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,
138	.num_regs = 2,
139	.irqs = max8907_chg_irqs,
140	.num_irqs = ARRAY_SIZE(max8907_chg_irqs),
141};
142
143static const struct regmap_irq max8907_on_off_irqs[] = {
144	{ .reg_offset = 0, .mask = 1 << 0, },
145	{ .reg_offset = 0, .mask = 1 << 1, },
146	{ .reg_offset = 0, .mask = 1 << 2, },
147	{ .reg_offset = 0, .mask = 1 << 3, },
148	{ .reg_offset = 0, .mask = 1 << 4, },
149	{ .reg_offset = 0, .mask = 1 << 5, },
150	{ .reg_offset = 0, .mask = 1 << 6, },
151	{ .reg_offset = 0, .mask = 1 << 7, },
152	{ .reg_offset = 1, .mask = 1 << 0, },
153	{ .reg_offset = 1, .mask = 1 << 1, },
154};
155
156static const struct regmap_irq_chip max8907_on_off_irq_chip = {
157	.name = "max8907 on_off",
158	.status_base = MAX8907_REG_ON_OFF_IRQ1,
159	.mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,
160	.irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,
161	.num_regs = 2,
162	.irqs = max8907_on_off_irqs,
163	.num_irqs = ARRAY_SIZE(max8907_on_off_irqs),
164};
165
166static const struct regmap_irq max8907_rtc_irqs[] = {
167	{ .reg_offset = 0, .mask = 1 << 2, },
168	{ .reg_offset = 0, .mask = 1 << 3, },
169};
170
171static const struct regmap_irq_chip max8907_rtc_irq_chip = {
172	.name = "max8907 rtc",
173	.status_base = MAX8907_REG_RTC_IRQ,
174	.mask_base = MAX8907_REG_RTC_IRQ_MASK,
175	.num_regs = 1,
176	.irqs = max8907_rtc_irqs,
177	.num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
178};
179
180static struct max8907 *max8907_pm_off;
181static void max8907_power_off(void)
182{
183	regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
184			MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
185}
186
187static int max8907_i2c_probe(struct i2c_client *i2c,
188				       const struct i2c_device_id *id)
189{
190	struct max8907 *max8907;
191	int ret;
192	struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
193	bool pm_off = false;
194
195	if (pdata)
196		pm_off = pdata->pm_off;
197	else if (i2c->dev.of_node)
198		pm_off = of_property_read_bool(i2c->dev.of_node,
199					"maxim,system-power-controller");
200
201	max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
202	if (!max8907) {
203		ret = -ENOMEM;
204		goto err_alloc_drvdata;
205	}
206
207	max8907->dev = &i2c->dev;
208	dev_set_drvdata(max8907->dev, max8907);
209
210	max8907->i2c_gen = i2c;
211	i2c_set_clientdata(i2c, max8907);
212	max8907->regmap_gen = devm_regmap_init_i2c(i2c,
213						&max8907_regmap_gen_config);
214	if (IS_ERR(max8907->regmap_gen)) {
215		ret = PTR_ERR(max8907->regmap_gen);
216		dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);
217		goto err_regmap_gen;
218	}
219
220	max8907->i2c_rtc = i2c_new_dummy(i2c->adapter, MAX8907_RTC_I2C_ADDR);
221	if (!max8907->i2c_rtc) {
222		ret = -ENOMEM;
223		goto err_dummy_rtc;
224	}
225	i2c_set_clientdata(max8907->i2c_rtc, max8907);
226	max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,
227						&max8907_regmap_rtc_config);
228	if (IS_ERR(max8907->regmap_rtc)) {
229		ret = PTR_ERR(max8907->regmap_rtc);
230		dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);
231		goto err_regmap_rtc;
232	}
233
234	irq_set_status_flags(max8907->i2c_gen->irq, IRQ_NOAUTOEN);
235
236	ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
237				  IRQF_ONESHOT | IRQF_SHARED, -1,
238				  &max8907_chg_irq_chip,
239				  &max8907->irqc_chg);
240	if (ret != 0) {
241		dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);
242		goto err_irqc_chg;
243	}
244	ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,
245				  IRQF_ONESHOT | IRQF_SHARED, -1,
246				  &max8907_on_off_irq_chip,
247				  &max8907->irqc_on_off);
248	if (ret != 0) {
249		dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);
250		goto err_irqc_on_off;
251	}
252	ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,
253				  IRQF_ONESHOT | IRQF_SHARED, -1,
254				  &max8907_rtc_irq_chip,
255				  &max8907->irqc_rtc);
256	if (ret != 0) {
257		dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);
258		goto err_irqc_rtc;
259	}
260
261	enable_irq(max8907->i2c_gen->irq);
262
263	ret = mfd_add_devices(max8907->dev, -1, max8907_cells,
264			      ARRAY_SIZE(max8907_cells), NULL, 0, NULL);
265	if (ret != 0) {
266		dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);
267		goto err_add_devices;
268	}
269
270	if (pm_off && !pm_power_off) {
271		max8907_pm_off = max8907;
272		pm_power_off = max8907_power_off;
273	}
274
275	return 0;
276
277err_add_devices:
278	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
279err_irqc_rtc:
280	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
281err_irqc_on_off:
282	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
283err_irqc_chg:
284err_regmap_rtc:
285	i2c_unregister_device(max8907->i2c_rtc);
286err_dummy_rtc:
287err_regmap_gen:
288err_alloc_drvdata:
289	return ret;
290}
291
292static int max8907_i2c_remove(struct i2c_client *i2c)
293{
294	struct max8907 *max8907 = i2c_get_clientdata(i2c);
295
296	mfd_remove_devices(max8907->dev);
297
298	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);
299	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);
300	regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);
301
302	i2c_unregister_device(max8907->i2c_rtc);
303
304	return 0;
305}
306
307#ifdef CONFIG_OF
308static const struct of_device_id max8907_of_match[] = {
309	{ .compatible = "maxim,max8907" },
310	{ },
311};
312MODULE_DEVICE_TABLE(of, max8907_of_match);
313#endif
314
315static const struct i2c_device_id max8907_i2c_id[] = {
316	{"max8907", 0},
317	{}
318};
319MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);
320
321static struct i2c_driver max8907_i2c_driver = {
322	.driver = {
323		.name = "max8907",
324		.owner = THIS_MODULE,
325		.of_match_table = of_match_ptr(max8907_of_match),
326	},
327	.probe = max8907_i2c_probe,
328	.remove = max8907_i2c_remove,
329	.id_table = max8907_i2c_id,
330};
331
332static int __init max8907_i2c_init(void)
333{
334	int ret = -ENODEV;
335
336	ret = i2c_add_driver(&max8907_i2c_driver);
337	if (ret != 0)
338		pr_err("Failed to register I2C driver: %d\n", ret);
339
340	return ret;
341}
342subsys_initcall(max8907_i2c_init);
343
344static void __exit max8907_i2c_exit(void)
345{
346	i2c_del_driver(&max8907_i2c_driver);
347}
348module_exit(max8907_i2c_exit);
349
350MODULE_DESCRIPTION("MAX8907 multi-function core driver");
351MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
352MODULE_LICENSE("GPL v2");
353