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Linux/drivers/rtc/rtc-as3722.c

  1 /*
  2  * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
  3  *
  4  * Copyright (C) 2013 ams AG
  5  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
  6  *
  7  * Author: Florian Lobmaier <florian.lobmaier@ams.com>
  8  * Author: Laxman Dewangan <ldewangan@nvidia.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  */
 20 
 21 #include <linux/bcd.h>
 22 #include <linux/completion.h>
 23 #include <linux/delay.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/ioctl.h>
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/mfd/as3722.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/rtc.h>
 31 #include <linux/time.h>
 32 
 33 #define AS3722_RTC_START_YEAR     2000
 34 struct as3722_rtc {
 35         struct rtc_device       *rtc;
 36         struct device           *dev;
 37         struct as3722           *as3722;
 38         int                     alarm_irq;
 39         bool                    irq_enable;
 40 };
 41 
 42 static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
 43 {
 44         rbuff[0] = bin2bcd(tm->tm_sec);
 45         rbuff[1] = bin2bcd(tm->tm_min);
 46         rbuff[2] = bin2bcd(tm->tm_hour);
 47         rbuff[3] = bin2bcd(tm->tm_mday);
 48         rbuff[4] = bin2bcd(tm->tm_mon);
 49         rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
 50 }
 51 
 52 static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
 53 {
 54         tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
 55         tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
 56         tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
 57         tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
 58         tm->tm_mon = bcd2bin(rbuff[4] & 0x1F);
 59         tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
 60         return;
 61 }
 62 
 63 static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)
 64 {
 65         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 66         struct as3722 *as3722 = as3722_rtc->as3722;
 67         u8 as_time_array[6];
 68         int ret;
 69 
 70         ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
 71                         6, as_time_array);
 72         if (ret < 0) {
 73                 dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
 74                 return ret;
 75         }
 76         as3722_reg_to_time(as_time_array, tm);
 77         return 0;
 78 }
 79 
 80 static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm)
 81 {
 82         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
 83         struct as3722 *as3722 = as3722_rtc->as3722;
 84         u8 as_time_array[6];
 85         int ret;
 86 
 87         if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
 88                 return -EINVAL;
 89 
 90         as3722_time_to_reg(as_time_array, tm);
 91         ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
 92                         as_time_array);
 93         if (ret < 0)
 94                 dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
 95         return ret;
 96 }
 97 
 98 static int as3722_rtc_alarm_irq_enable(struct device *dev,
 99                 unsigned int enabled)
100 {
101         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
102 
103         if (enabled && !as3722_rtc->irq_enable) {
104                 enable_irq(as3722_rtc->alarm_irq);
105                 as3722_rtc->irq_enable = true;
106         } else if (!enabled && as3722_rtc->irq_enable)  {
107                 disable_irq(as3722_rtc->alarm_irq);
108                 as3722_rtc->irq_enable = false;
109         }
110         return 0;
111 }
112 
113 static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
114 {
115         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
116         struct as3722 *as3722 = as3722_rtc->as3722;
117         u8 as_time_array[6];
118         int ret;
119 
120         ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
121                         as_time_array);
122         if (ret < 0) {
123                 dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
124                 return ret;
125         }
126 
127         as3722_reg_to_time(as_time_array, &alrm->time);
128         return 0;
129 }
130 
131 static int as3722_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
132 {
133         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
134         struct as3722 *as3722 = as3722_rtc->as3722;
135         u8 as_time_array[6];
136         int ret;
137 
138         if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
139                 return -EINVAL;
140 
141         ret = as3722_rtc_alarm_irq_enable(dev, 0);
142         if (ret < 0) {
143                 dev_err(dev, "Disable RTC alarm failed\n");
144                 return ret;
145         }
146 
147         as3722_time_to_reg(as_time_array, &alrm->time);
148         ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
149                         as_time_array);
150         if (ret < 0) {
151                 dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
152                 return ret;
153         }
154 
155         if (alrm->enabled)
156                 ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
157         return ret;
158 }
159 
160 static irqreturn_t as3722_alarm_irq(int irq, void *data)
161 {
162         struct as3722_rtc *as3722_rtc = data;
163 
164         rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF | RTC_AF);
165         return IRQ_HANDLED;
166 }
167 
168 static const struct rtc_class_ops as3722_rtc_ops = {
169         .read_time = as3722_rtc_read_time,
170         .set_time = as3722_rtc_set_time,
171         .read_alarm = as3722_rtc_read_alarm,
172         .set_alarm = as3722_rtc_set_alarm,
173         .alarm_irq_enable = as3722_rtc_alarm_irq_enable,
174 };
175 
176 static int as3722_rtc_probe(struct platform_device *pdev)
177 {
178         struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
179         struct as3722_rtc *as3722_rtc;
180         int ret;
181 
182         as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
183         if (!as3722_rtc)
184                 return -ENOMEM;
185 
186         as3722_rtc->as3722 = as3722;
187         as3722_rtc->dev = &pdev->dev;
188         platform_set_drvdata(pdev, as3722_rtc);
189 
190         /* Enable the RTC to make sure it is running. */
191         ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
192                         AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN,
193                         AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN);
194         if (ret < 0) {
195                 dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
196                 return ret;
197         }
198 
199         device_init_wakeup(&pdev->dev, 1);
200 
201         as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
202                                 &as3722_rtc_ops, THIS_MODULE);
203         if (IS_ERR(as3722_rtc->rtc)) {
204                 ret = PTR_ERR(as3722_rtc->rtc);
205                 dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
206                 return ret;
207         }
208 
209         as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
210         dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);
211 
212         ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
213                         as3722_alarm_irq, IRQF_ONESHOT | IRQF_EARLY_RESUME,
214                         "rtc-alarm", as3722_rtc);
215         if (ret < 0) {
216                 dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
217                                 as3722_rtc->alarm_irq, ret);
218                 return ret;
219         }
220         disable_irq(as3722_rtc->alarm_irq);
221         return 0;
222 }
223 
224 #ifdef CONFIG_PM_SLEEP
225 static int as3722_rtc_suspend(struct device *dev)
226 {
227         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
228 
229         if (device_may_wakeup(dev))
230                 enable_irq_wake(as3722_rtc->alarm_irq);
231 
232         return 0;
233 }
234 
235 static int as3722_rtc_resume(struct device *dev)
236 {
237         struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
238 
239         if (device_may_wakeup(dev))
240                 disable_irq_wake(as3722_rtc->alarm_irq);
241         return 0;
242 }
243 #endif
244 
245 static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
246                          as3722_rtc_resume);
247 
248 static struct platform_driver as3722_rtc_driver = {
249         .probe = as3722_rtc_probe,
250         .driver = {
251                 .name = "as3722-rtc",
252                 .pm = &as3722_rtc_pm_ops,
253         },
254 };
255 module_platform_driver(as3722_rtc_driver);
256 
257 MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
258 MODULE_ALIAS("platform:as3722-rtc");
259 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
260 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
261 MODULE_LICENSE("GPL");
262 

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