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/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", 0},
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 <jack.yoo@maxim-ic.com>");
338MODULE_LICENSE("GPL v2");
339