1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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> |
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); |
39 | rbuff[4] = bin2bcd(tm->tm_mon + 1); |
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); |
49 | tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1; |
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 | count: 6, buf: 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(rbuff: 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(rbuff: as_time_array, tm); |
82 | ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, count: 6, |
83 | data: 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(irq: as3722_rtc->alarm_irq); |
96 | as3722_rtc->irq_enable = true; |
97 | } else if (!enabled && as3722_rtc->irq_enable) { |
98 | disable_irq(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, count: 6, |
112 | buf: 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(rbuff: as_time_array, tm: &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, enabled: 0); |
133 | if (ret < 0) { |
134 | dev_err(dev, "Disable RTC alarm failed\n" ); |
135 | return ret; |
136 | } |
137 | |
138 | as3722_time_to_reg(rbuff: as_time_array, tm: &alrm->time); |
139 | ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, count: 6, |
140 | data: 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, enabled: 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(rtc: as3722_rtc->rtc, num: 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(dev: pdev->dev.parent); |
170 | struct as3722_rtc *as3722_rtc; |
171 | int ret; |
172 | |
173 | as3722_rtc = devm_kzalloc(dev: &pdev->dev, size: 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, data: 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(dev: &pdev->dev, enable: 1); |
191 | |
192 | as3722_rtc->rtc = devm_rtc_device_register(dev: &pdev->dev, name: "as3722-rtc" , |
193 | ops: &as3722_rtc_ops, THIS_MODULE); |
194 | if (IS_ERR(ptr: as3722_rtc->rtc)) { |
195 | ret = PTR_ERR(ptr: 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 | |
203 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: as3722_rtc->alarm_irq, NULL, |
204 | thread_fn: as3722_alarm_irq, IRQF_ONESHOT, |
205 | devname: "rtc-alarm" , dev_id: 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); |
209 | return ret; |
210 | } |
211 | disable_irq(irq: as3722_rtc->alarm_irq); |
212 | return 0; |
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(irq: 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(irq: as3722_rtc->alarm_irq); |
232 | return 0; |
233 | } |
234 | #endif |
235 | |
236 | static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend, |
237 | as3722_rtc_resume); |
238 | |
239 | static struct platform_driver as3722_rtc_driver = { |
240 | .probe = as3722_rtc_probe, |
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" ); |
253 | |