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dae8a969 JL |
1 | /* |
2 | * max77686.c - mfd core driver for the Maxim 77686 | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electronics | |
5 | * Chiwoong Byun <woong.byun@smasung.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> | |
6f1c1e71 JMC |
28 | #include <linux/irq.h> |
29 | #include <linux/interrupt.h> | |
dae8a969 JL |
30 | #include <linux/pm_runtime.h> |
31 | #include <linux/module.h> | |
dae8a969 JL |
32 | #include <linux/mfd/core.h> |
33 | #include <linux/mfd/max77686.h> | |
34 | #include <linux/mfd/max77686-private.h> | |
35 | #include <linux/err.h> | |
2a048d3b | 36 | #include <linux/of.h> |
dae8a969 JL |
37 | |
38 | #define I2C_ADDR_RTC (0x0C >> 1) | |
39 | ||
7c0517b1 | 40 | static const struct mfd_cell max77686_devs[] = { |
dae8a969 JL |
41 | { .name = "max77686-pmic", }, |
42 | { .name = "max77686-rtc", }, | |
c0fa7e10 | 43 | { .name = "max77686-clk", }, |
dae8a969 JL |
44 | }; |
45 | ||
46 | static struct regmap_config max77686_regmap_config = { | |
47 | .reg_bits = 8, | |
48 | .val_bits = 8, | |
49 | }; | |
50 | ||
6f1c1e71 JMC |
51 | static struct regmap_config max77686_rtc_regmap_config = { |
52 | .reg_bits = 8, | |
53 | .val_bits = 8, | |
54 | }; | |
55 | ||
56 | static const struct regmap_irq max77686_irqs[] = { | |
57 | /* INT1 interrupts */ | |
58 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, | |
59 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, | |
60 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, | |
61 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, | |
62 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, | |
63 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, | |
64 | { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, | |
65 | { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, | |
66 | /* INT2 interrupts */ | |
67 | { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, | |
68 | { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, | |
69 | }; | |
70 | ||
71 | static const struct regmap_irq_chip max77686_irq_chip = { | |
72 | .name = "max77686-pmic", | |
73 | .status_base = MAX77686_REG_INT1, | |
74 | .mask_base = MAX77686_REG_INT1MSK, | |
75 | .num_regs = 2, | |
76 | .irqs = max77686_irqs, | |
77 | .num_irqs = ARRAY_SIZE(max77686_irqs), | |
78 | }; | |
79 | ||
80 | static const struct regmap_irq max77686_rtc_irqs[] = { | |
81 | /* RTC interrupts */ | |
82 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC60S_MSK, }, | |
83 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA1_MSK, }, | |
84 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA2_MSK, }, | |
85 | { .reg_offset = 0, .mask = MAX77686_RTCINT_SMPL_MSK, }, | |
86 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC1S_MSK, }, | |
87 | { .reg_offset = 0, .mask = MAX77686_RTCINT_WTSR_MSK, }, | |
88 | }; | |
89 | ||
90 | static const struct regmap_irq_chip max77686_rtc_irq_chip = { | |
91 | .name = "max77686-rtc", | |
92 | .status_base = MAX77686_RTC_INT, | |
93 | .mask_base = MAX77686_RTC_INTM, | |
94 | .num_regs = 1, | |
95 | .irqs = max77686_rtc_irqs, | |
96 | .num_irqs = ARRAY_SIZE(max77686_rtc_irqs), | |
97 | }; | |
98 | ||
b68ece3d | 99 | static const struct of_device_id max77686_pmic_dt_match[] = { |
d1ac2c09 | 100 | {.compatible = "maxim,max77686", .data = NULL}, |
2984fc00 AL |
101 | {}, |
102 | }; | |
103 | ||
c1516f84 YSB |
104 | static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device |
105 | *dev) | |
106 | { | |
107 | struct max77686_platform_data *pd; | |
108 | ||
109 | pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); | |
110 | if (!pd) { | |
111 | dev_err(dev, "could not allocate memory for pdata\n"); | |
112 | return NULL; | |
113 | } | |
114 | ||
115 | dev->platform_data = pd; | |
116 | return pd; | |
117 | } | |
c1516f84 | 118 | |
dae8a969 JL |
119 | static int max77686_i2c_probe(struct i2c_client *i2c, |
120 | const struct i2c_device_id *id) | |
121 | { | |
c1516f84 | 122 | struct max77686_dev *max77686 = NULL; |
334a41ce | 123 | struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev); |
dae8a969 JL |
124 | unsigned int data; |
125 | int ret = 0; | |
126 | ||
154409e4 | 127 | if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) |
c1516f84 YSB |
128 | pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); |
129 | ||
130 | if (!pdata) { | |
c1516f84 | 131 | dev_err(&i2c->dev, "No platform data found.\n"); |
742413a4 | 132 | return -EIO; |
c1516f84 YSB |
133 | } |
134 | ||
742413a4 LJ |
135 | max77686 = devm_kzalloc(&i2c->dev, |
136 | sizeof(struct max77686_dev), GFP_KERNEL); | |
dae8a969 JL |
137 | if (max77686 == NULL) |
138 | return -ENOMEM; | |
139 | ||
dae8a969 JL |
140 | i2c_set_clientdata(i2c, max77686); |
141 | max77686->dev = &i2c->dev; | |
142 | max77686->i2c = i2c; | |
143 | max77686->type = id->driver_data; | |
144 | ||
dae8a969 | 145 | max77686->wakeup = pdata->wakeup; |
2b40459b | 146 | max77686->irq = i2c->irq; |
dae8a969 | 147 | |
74142ffc | 148 | max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config); |
136d982e AL |
149 | if (IS_ERR(max77686->regmap)) { |
150 | ret = PTR_ERR(max77686->regmap); | |
151 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
152 | ret); | |
136d982e AL |
153 | return ret; |
154 | } | |
155 | ||
dae8a969 JL |
156 | if (regmap_read(max77686->regmap, |
157 | MAX77686_REG_DEVICE_ID, &data) < 0) { | |
158 | dev_err(max77686->dev, | |
159 | "device not found on this channel (this is not an error)\n"); | |
742413a4 | 160 | return -ENODEV; |
6f1c1e71 | 161 | } |
dae8a969 JL |
162 | |
163 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); | |
b9e183a1 KK |
164 | if (!max77686->rtc) { |
165 | dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n"); | |
166 | return -ENODEV; | |
167 | } | |
dae8a969 JL |
168 | i2c_set_clientdata(max77686->rtc, max77686); |
169 | ||
6f1c1e71 JMC |
170 | max77686->rtc_regmap = devm_regmap_init_i2c(max77686->rtc, |
171 | &max77686_rtc_regmap_config); | |
172 | if (IS_ERR(max77686->rtc_regmap)) { | |
173 | ret = PTR_ERR(max77686->rtc_regmap); | |
174 | dev_err(max77686->dev, "failed to allocate RTC regmap: %d\n", | |
175 | ret); | |
176 | goto err_unregister_i2c; | |
177 | } | |
178 | ||
179 | ret = regmap_add_irq_chip(max77686->regmap, max77686->irq, | |
180 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | | |
181 | IRQF_SHARED, 0, &max77686_irq_chip, | |
182 | &max77686->irq_data); | |
183 | if (ret != 0) { | |
184 | dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); | |
185 | goto err_unregister_i2c; | |
186 | } | |
187 | ret = regmap_add_irq_chip(max77686->rtc_regmap, max77686->irq, | |
188 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | | |
189 | IRQF_SHARED, 0, &max77686_rtc_irq_chip, | |
190 | &max77686->rtc_irq_data); | |
191 | if (ret != 0) { | |
192 | dev_err(&i2c->dev, "failed to add RTC irq chip: %d\n", ret); | |
193 | goto err_del_irqc; | |
194 | } | |
dae8a969 JL |
195 | |
196 | ret = mfd_add_devices(max77686->dev, -1, max77686_devs, | |
0848c94f | 197 | ARRAY_SIZE(max77686_devs), NULL, 0, NULL); |
742413a4 | 198 | if (ret < 0) { |
6f1c1e71 JMC |
199 | dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); |
200 | goto err_del_rtc_irqc; | |
742413a4 | 201 | } |
dae8a969 | 202 | |
6f1c1e71 JMC |
203 | return 0; |
204 | ||
205 | err_del_rtc_irqc: | |
206 | regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); | |
207 | err_del_irqc: | |
208 | regmap_del_irq_chip(max77686->irq, max77686->irq_data); | |
209 | err_unregister_i2c: | |
210 | i2c_unregister_device(max77686->rtc); | |
211 | ||
dae8a969 JL |
212 | return ret; |
213 | } | |
214 | ||
215 | static int max77686_i2c_remove(struct i2c_client *i2c) | |
216 | { | |
217 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
218 | ||
219 | mfd_remove_devices(max77686->dev); | |
6f1c1e71 JMC |
220 | |
221 | regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); | |
222 | regmap_del_irq_chip(max77686->irq, max77686->irq_data); | |
223 | ||
dae8a969 | 224 | i2c_unregister_device(max77686->rtc); |
dae8a969 JL |
225 | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static const struct i2c_device_id max77686_i2c_id[] = { | |
230 | { "max77686", TYPE_MAX77686 }, | |
231 | { } | |
232 | }; | |
233 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
234 | ||
2b52b5d5 JMC |
235 | #ifdef CONFIG_PM_SLEEP |
236 | static int max77686_suspend(struct device *dev) | |
237 | { | |
238 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
239 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
240 | ||
241 | if (device_may_wakeup(dev)) | |
242 | enable_irq_wake(max77686->irq); | |
243 | ||
244 | /* | |
245 | * IRQ must be disabled during suspend because if it happens | |
246 | * while suspended it will be handled before resuming I2C. | |
247 | * | |
248 | * When device is woken up from suspend (e.g. by RTC wake alarm), | |
249 | * an interrupt occurs before resuming I2C bus controller. | |
250 | * Interrupt handler tries to read registers but this read | |
251 | * will fail because I2C is still suspended. | |
252 | */ | |
253 | disable_irq(max77686->irq); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static int max77686_resume(struct device *dev) | |
259 | { | |
260 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
261 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
262 | ||
263 | if (device_may_wakeup(dev)) | |
264 | disable_irq_wake(max77686->irq); | |
265 | ||
266 | enable_irq(max77686->irq); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | #endif /* CONFIG_PM_SLEEP */ | |
271 | ||
272 | static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); | |
273 | ||
dae8a969 JL |
274 | static struct i2c_driver max77686_i2c_driver = { |
275 | .driver = { | |
276 | .name = "max77686", | |
277 | .owner = THIS_MODULE, | |
2b52b5d5 | 278 | .pm = &max77686_pm, |
c1516f84 | 279 | .of_match_table = of_match_ptr(max77686_pmic_dt_match), |
dae8a969 JL |
280 | }, |
281 | .probe = max77686_i2c_probe, | |
282 | .remove = max77686_i2c_remove, | |
283 | .id_table = max77686_i2c_id, | |
284 | }; | |
285 | ||
286 | static int __init max77686_i2c_init(void) | |
287 | { | |
288 | return i2c_add_driver(&max77686_i2c_driver); | |
289 | } | |
290 | /* init early so consumer devices can complete system boot */ | |
291 | subsys_initcall(max77686_i2c_init); | |
292 | ||
293 | static void __exit max77686_i2c_exit(void) | |
294 | { | |
295 | i2c_del_driver(&max77686_i2c_driver); | |
296 | } | |
297 | module_exit(max77686_i2c_exit); | |
298 | ||
299 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); | |
300 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
301 | MODULE_LICENSE("GPL"); |