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1/*
2 * max77686.c - mfd core driver for the Maxim 77686/802
3 *
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@samsung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max8997.c
23 */
24
25#include <linux/export.h>
26#include <linux/slab.h>
27#include <linux/i2c.h>
28#include <linux/irq.h>
29#include <linux/interrupt.h>
30#include <linux/pm_runtime.h>
31#include <linux/module.h>
32#include <linux/mfd/core.h>
33#include <linux/mfd/max77686.h>
34#include <linux/mfd/max77686-private.h>
35#include <linux/err.h>
36#include <linux/of.h>
37
38static const struct mfd_cell max77686_devs[] = {
39 { .name = "max77686-pmic", },
40 { .name = "max77686-rtc", },
41 { .name = "max77686-clk", },
42};
43
44static const struct mfd_cell max77802_devs[] = {
45 { .name = "max77802-pmic", },
46 { .name = "max77802-clk", },
47 { .name = "max77802-rtc", },
48};
49
50static bool max77802_pmic_is_accessible_reg(struct device *dev,
51 unsigned int reg)
52{
53 return reg < MAX77802_REG_PMIC_END;
54}
55
56static bool max77802_rtc_is_accessible_reg(struct device *dev,
57 unsigned int reg)
58{
59 return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
60}
61
62static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
63{
64 return (max77802_pmic_is_accessible_reg(dev, reg) ||
65 max77802_rtc_is_accessible_reg(dev, reg));
66}
67
68static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
69{
70 return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
71 reg == MAX77802_REG_INT2);
72}
73
74static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
75{
76 return (reg == MAX77802_RTC_INT ||
77 reg == MAX77802_RTC_UPDATE0 ||
78 reg == MAX77802_RTC_UPDATE1);
79}
80
81static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
82{
83 return (max77802_pmic_is_precious_reg(dev, reg) ||
84 max77802_rtc_is_precious_reg(dev, reg));
85}
86
87static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
88{
89 return (max77802_is_precious_reg(dev, reg) ||
90 reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
91 reg == MAX77802_REG_PWRON);
92}
93
94static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
95{
96 return (max77802_rtc_is_precious_reg(dev, reg) ||
97 reg == MAX77802_RTC_SEC ||
98 reg == MAX77802_RTC_MIN ||
99 reg == MAX77802_RTC_HOUR ||
100 reg == MAX77802_RTC_WEEKDAY ||
101 reg == MAX77802_RTC_MONTH ||
102 reg == MAX77802_RTC_YEAR ||
103 reg == MAX77802_RTC_DATE);
104}
105
106static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
107{
108 return (max77802_pmic_is_volatile_reg(dev, reg) ||
109 max77802_rtc_is_volatile_reg(dev, reg));
110}
111
112static const struct regmap_config max77686_regmap_config = {
113 .reg_bits = 8,
114 .val_bits = 8,
115};
116
117static const struct regmap_config max77802_regmap_config = {
118 .reg_bits = 8,
119 .val_bits = 8,
120 .writeable_reg = max77802_is_accessible_reg,
121 .readable_reg = max77802_is_accessible_reg,
122 .precious_reg = max77802_is_precious_reg,
123 .volatile_reg = max77802_is_volatile_reg,
124 .name = "max77802-pmic",
125 .cache_type = REGCACHE_RBTREE,
126};
127
128static const struct regmap_irq max77686_irqs[] = {
129 /* INT1 interrupts */
130 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
131 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
132 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
133 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
134 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
135 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
136 { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
137 { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
138 /* INT2 interrupts */
139 { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
140 { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
141};
142
143static const struct regmap_irq_chip max77686_irq_chip = {
144 .name = "max77686-pmic",
145 .status_base = MAX77686_REG_INT1,
146 .mask_base = MAX77686_REG_INT1MSK,
147 .num_regs = 2,
148 .irqs = max77686_irqs,
149 .num_irqs = ARRAY_SIZE(max77686_irqs),
150};
151
152static const struct regmap_irq_chip max77802_irq_chip = {
153 .name = "max77802-pmic",
154 .status_base = MAX77802_REG_INT1,
155 .mask_base = MAX77802_REG_INT1MSK,
156 .num_regs = 2,
157 .irqs = max77686_irqs, /* same masks as 77686 */
158 .num_irqs = ARRAY_SIZE(max77686_irqs),
159};
160
161static const struct of_device_id max77686_pmic_dt_match[] = {
162 {
163 .compatible = "maxim,max77686",
164 .data = (void *)TYPE_MAX77686,
165 },
166 {
167 .compatible = "maxim,max77802",
168 .data = (void *)TYPE_MAX77802,
169 },
170 { },
171};
172MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);
173
174static int max77686_i2c_probe(struct i2c_client *i2c,
175 const struct i2c_device_id *id)
176{
177 struct max77686_dev *max77686 = NULL;
178 const struct of_device_id *match;
179 unsigned int data;
180 int ret = 0;
181 const struct regmap_config *config;
182 const struct regmap_irq_chip *irq_chip;
183 const struct mfd_cell *cells;
184 int n_devs;
185
186 max77686 = devm_kzalloc(&i2c->dev,
187 sizeof(struct max77686_dev), GFP_KERNEL);
188 if (!max77686)
189 return -ENOMEM;
190
191 if (i2c->dev.of_node) {
192 match = of_match_node(max77686_pmic_dt_match, i2c->dev.of_node);
193 if (!match)
194 return -EINVAL;
195
196 max77686->type = (unsigned long)match->data;
197 } else
198 max77686->type = id->driver_data;
199
200 i2c_set_clientdata(i2c, max77686);
201 max77686->dev = &i2c->dev;
202 max77686->i2c = i2c;
203
204 max77686->irq = i2c->irq;
205
206 if (max77686->type == TYPE_MAX77686) {
207 config = &max77686_regmap_config;
208 irq_chip = &max77686_irq_chip;
209 cells = max77686_devs;
210 n_devs = ARRAY_SIZE(max77686_devs);
211 } else {
212 config = &max77802_regmap_config;
213 irq_chip = &max77802_irq_chip;
214 cells = max77802_devs;
215 n_devs = ARRAY_SIZE(max77802_devs);
216 }
217
218 max77686->regmap = devm_regmap_init_i2c(i2c, config);
219 if (IS_ERR(max77686->regmap)) {
220 ret = PTR_ERR(max77686->regmap);
221 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
222 ret);
223 return ret;
224 }
225
226 ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
227 if (ret < 0) {
228 dev_err(max77686->dev,
229 "device not found on this channel (this is not an error)\n");
230 return -ENODEV;
231 }
232
233 ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
234 max77686->irq,
235 IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
236 IRQF_SHARED, 0, irq_chip,
237 &max77686->irq_data);
238 if (ret < 0) {
239 dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
240 return ret;
241 }
242
243 ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
244 0, NULL);
245 if (ret < 0) {
246 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
247 return ret;
248 }
249
250 return 0;
251}
252
253static const struct i2c_device_id max77686_i2c_id[] = {
254 { "max77686", TYPE_MAX77686 },
255 { "max77802", TYPE_MAX77802 },
256 { }
257};
258MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
259
260#ifdef CONFIG_PM_SLEEP
261static int max77686_suspend(struct device *dev)
262{
263 struct i2c_client *i2c = to_i2c_client(dev);
264 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
265
266 if (device_may_wakeup(dev))
267 enable_irq_wake(max77686->irq);
268
269 /*
270 * IRQ must be disabled during suspend because if it happens
271 * while suspended it will be handled before resuming I2C.
272 *
273 * When device is woken up from suspend (e.g. by RTC wake alarm),
274 * an interrupt occurs before resuming I2C bus controller.
275 * Interrupt handler tries to read registers but this read
276 * will fail because I2C is still suspended.
277 */
278 disable_irq(max77686->irq);
279
280 return 0;
281}
282
283static int max77686_resume(struct device *dev)
284{
285 struct i2c_client *i2c = to_i2c_client(dev);
286 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
287
288 if (device_may_wakeup(dev))
289 disable_irq_wake(max77686->irq);
290
291 enable_irq(max77686->irq);
292
293 return 0;
294}
295#endif /* CONFIG_PM_SLEEP */
296
297static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
298
299static struct i2c_driver max77686_i2c_driver = {
300 .driver = {
301 .name = "max77686",
302 .pm = &max77686_pm,
303 .of_match_table = of_match_ptr(max77686_pmic_dt_match),
304 },
305 .probe = max77686_i2c_probe,
306 .id_table = max77686_i2c_id,
307};
308
309module_i2c_driver(max77686_i2c_driver);
310
311MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
312MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
313MODULE_LICENSE("GPL");