Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b4506261 LD |
2 | /* |
3 | * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs | |
4 | * | |
5 | * Copyright (C) 2013 ams AG | |
6 | * Copyright (c) 2013, NVIDIA Corporation. All rights reserved. | |
7 | * | |
8 | * Author: Florian Lobmaier <florian.lobmaier@ams.com> | |
9 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
b4506261 LD |
10 | */ |
11 | ||
12 | #include <linux/bcd.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/delay.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/ioctl.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mfd/as3722.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/rtc.h> | |
22 | #include <linux/time.h> | |
23 | ||
24 | #define AS3722_RTC_START_YEAR 2000 | |
25 | struct as3722_rtc { | |
26 | struct rtc_device *rtc; | |
27 | struct device *dev; | |
28 | struct as3722 *as3722; | |
29 | int alarm_irq; | |
30 | bool irq_enable; | |
31 | }; | |
32 | ||
33 | static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm) | |
34 | { | |
35 | rbuff[0] = bin2bcd(tm->tm_sec); | |
36 | rbuff[1] = bin2bcd(tm->tm_min); | |
37 | rbuff[2] = bin2bcd(tm->tm_hour); | |
38 | rbuff[3] = bin2bcd(tm->tm_mday); | |
a038c3aa | 39 | rbuff[4] = bin2bcd(tm->tm_mon + 1); |
b4506261 LD |
40 | rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900)); |
41 | } | |
42 | ||
43 | static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm) | |
44 | { | |
45 | tm->tm_sec = bcd2bin(rbuff[0] & 0x7F); | |
46 | tm->tm_min = bcd2bin(rbuff[1] & 0x7F); | |
47 | tm->tm_hour = bcd2bin(rbuff[2] & 0x3F); | |
48 | tm->tm_mday = bcd2bin(rbuff[3] & 0x3F); | |
a038c3aa | 49 | tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1; |
b4506261 LD |
50 | tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F); |
51 | return; | |
52 | } | |
53 | ||
54 | static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
55 | { | |
56 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
57 | struct as3722 *as3722 = as3722_rtc->as3722; | |
58 | u8 as_time_array[6]; | |
59 | int ret; | |
60 | ||
61 | ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG, | |
62 | 6, as_time_array); | |
63 | if (ret < 0) { | |
64 | dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret); | |
65 | return ret; | |
66 | } | |
67 | as3722_reg_to_time(as_time_array, tm); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
72 | { | |
73 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
74 | struct as3722 *as3722 = as3722_rtc->as3722; | |
75 | u8 as_time_array[6]; | |
76 | int ret; | |
77 | ||
78 | if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900)) | |
79 | return -EINVAL; | |
80 | ||
81 | as3722_time_to_reg(as_time_array, tm); | |
82 | ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6, | |
83 | as_time_array); | |
84 | if (ret < 0) | |
85 | dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret); | |
86 | return ret; | |
87 | } | |
88 | ||
89 | static int as3722_rtc_alarm_irq_enable(struct device *dev, | |
90 | unsigned int enabled) | |
91 | { | |
92 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
93 | ||
94 | if (enabled && !as3722_rtc->irq_enable) { | |
95 | enable_irq(as3722_rtc->alarm_irq); | |
96 | as3722_rtc->irq_enable = true; | |
97 | } else if (!enabled && as3722_rtc->irq_enable) { | |
98 | disable_irq(as3722_rtc->alarm_irq); | |
99 | as3722_rtc->irq_enable = false; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
105 | { | |
106 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
107 | struct as3722 *as3722 = as3722_rtc->as3722; | |
108 | u8 as_time_array[6]; | |
109 | int ret; | |
110 | ||
111 | ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6, | |
112 | as_time_array); | |
113 | if (ret < 0) { | |
114 | dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | as3722_reg_to_time(as_time_array, &alrm->time); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int as3722_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
123 | { | |
124 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
125 | struct as3722 *as3722 = as3722_rtc->as3722; | |
126 | u8 as_time_array[6]; | |
127 | int ret; | |
128 | ||
129 | if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900)) | |
130 | return -EINVAL; | |
131 | ||
132 | ret = as3722_rtc_alarm_irq_enable(dev, 0); | |
133 | if (ret < 0) { | |
134 | dev_err(dev, "Disable RTC alarm failed\n"); | |
135 | return ret; | |
136 | } | |
137 | ||
138 | as3722_time_to_reg(as_time_array, &alrm->time); | |
139 | ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6, | |
140 | as_time_array); | |
141 | if (ret < 0) { | |
142 | dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret); | |
143 | return ret; | |
144 | } | |
145 | ||
146 | if (alrm->enabled) | |
147 | ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled); | |
148 | return ret; | |
149 | } | |
150 | ||
151 | static irqreturn_t as3722_alarm_irq(int irq, void *data) | |
152 | { | |
153 | struct as3722_rtc *as3722_rtc = data; | |
154 | ||
155 | rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF | RTC_AF); | |
156 | return IRQ_HANDLED; | |
157 | } | |
158 | ||
159 | static const struct rtc_class_ops as3722_rtc_ops = { | |
160 | .read_time = as3722_rtc_read_time, | |
161 | .set_time = as3722_rtc_set_time, | |
162 | .read_alarm = as3722_rtc_read_alarm, | |
163 | .set_alarm = as3722_rtc_set_alarm, | |
164 | .alarm_irq_enable = as3722_rtc_alarm_irq_enable, | |
165 | }; | |
166 | ||
167 | static int as3722_rtc_probe(struct platform_device *pdev) | |
168 | { | |
169 | struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent); | |
170 | struct as3722_rtc *as3722_rtc; | |
171 | int ret; | |
172 | ||
173 | as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL); | |
174 | if (!as3722_rtc) | |
175 | return -ENOMEM; | |
176 | ||
177 | as3722_rtc->as3722 = as3722; | |
178 | as3722_rtc->dev = &pdev->dev; | |
179 | platform_set_drvdata(pdev, as3722_rtc); | |
180 | ||
181 | /* Enable the RTC to make sure it is running. */ | |
182 | ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG, | |
183 | AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN, | |
184 | AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN); | |
185 | if (ret < 0) { | |
186 | dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret); | |
187 | return ret; | |
188 | } | |
189 | ||
190 | device_init_wakeup(&pdev->dev, 1); | |
191 | ||
75465c49 | 192 | as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc", |
b4506261 LD |
193 | &as3722_rtc_ops, THIS_MODULE); |
194 | if (IS_ERR(as3722_rtc->rtc)) { | |
195 | ret = PTR_ERR(as3722_rtc->rtc); | |
196 | dev_err(&pdev->dev, "RTC register failed: %d\n", ret); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | as3722_rtc->alarm_irq = platform_get_irq(pdev, 0); | |
201 | dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq); | |
202 | ||
75465c49 | 203 | ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL, |
ddf7059c | 204 | as3722_alarm_irq, IRQF_ONESHOT, |
b4506261 LD |
205 | "rtc-alarm", as3722_rtc); |
206 | if (ret < 0) { | |
207 | dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n", | |
208 | as3722_rtc->alarm_irq, ret); | |
75465c49 | 209 | return ret; |
b4506261 LD |
210 | } |
211 | disable_irq(as3722_rtc->alarm_irq); | |
212 | return 0; | |
b4506261 LD |
213 | } |
214 | ||
215 | #ifdef CONFIG_PM_SLEEP | |
216 | static int as3722_rtc_suspend(struct device *dev) | |
217 | { | |
218 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
219 | ||
220 | if (device_may_wakeup(dev)) | |
221 | enable_irq_wake(as3722_rtc->alarm_irq); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int as3722_rtc_resume(struct device *dev) | |
227 | { | |
228 | struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev); | |
229 | ||
230 | if (device_may_wakeup(dev)) | |
231 | disable_irq_wake(as3722_rtc->alarm_irq); | |
232 | return 0; | |
233 | } | |
234 | #endif | |
235 | ||
d55255cb JH |
236 | static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend, |
237 | as3722_rtc_resume); | |
b4506261 LD |
238 | |
239 | static struct platform_driver as3722_rtc_driver = { | |
240 | .probe = as3722_rtc_probe, | |
b4506261 LD |
241 | .driver = { |
242 | .name = "as3722-rtc", | |
243 | .pm = &as3722_rtc_pm_ops, | |
244 | }, | |
245 | }; | |
246 | module_platform_driver(as3722_rtc_driver); | |
247 | ||
248 | MODULE_DESCRIPTION("RTC driver for AS3722 PMICs"); | |
249 | MODULE_ALIAS("platform:as3722-rtc"); | |
250 | MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>"); | |
251 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
252 | MODULE_LICENSE("GPL"); |