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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
34struct 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
42static 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
52static 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
63static 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
80static 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
98static 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
113static 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
131static 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
160static 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
168static 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
176static 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
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
225static 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
235static 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
245static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
246 as3722_rtc_resume);
247
248static 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};
255module_platform_driver(as3722_rtc_driver);
256
257MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
258MODULE_ALIAS("platform:as3722-rtc");
259MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
260MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
261MODULE_LICENSE("GPL");
262
