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0e783980 VB |
1 | /* |
2 | * rtc-tps65910.c -- TPS65910 Real Time Clock interface | |
3 | * | |
4 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | |
5 | * Author: Venu Byravarasu <vbyravarasu@nvidia.com> | |
6 | * | |
7 | * Based on original TI driver rtc-twl.c | |
8 | * Copyright (C) 2007 MontaVista Software, Inc | |
9 | * Author: Alexandre Rusev <source@mvista.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
22 | #include <linux/rtc.h> | |
23 | #include <linux/bcd.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/mfd/tps65910.h> | |
27 | ||
28 | struct tps65910_rtc { | |
29 | struct rtc_device *rtc; | |
30 | /* To store the list of enabled interrupts */ | |
31 | u32 irqstat; | |
32 | }; | |
33 | ||
34 | /* Total number of RTC registers needed to set time*/ | |
35 | #define NUM_TIME_REGS (TPS65910_YEARS - TPS65910_SECONDS + 1) | |
36 | ||
37 | static int tps65910_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) | |
38 | { | |
39 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
40 | u8 val = 0; | |
41 | ||
42 | if (enabled) | |
43 | val = TPS65910_RTC_INTERRUPTS_IT_ALARM; | |
44 | ||
45 | return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, val); | |
46 | } | |
47 | ||
48 | /* | |
49 | * Gets current tps65910 RTC time and date parameters. | |
50 | * | |
51 | * The RTC's time/alarm representation is not what gmtime(3) requires | |
52 | * Linux to use: | |
53 | * | |
54 | * - Months are 1..12 vs Linux 0-11 | |
55 | * - Years are 0..99 vs Linux 1900..N (we assume 21st century) | |
56 | */ | |
57 | static int tps65910_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
58 | { | |
59 | unsigned char rtc_data[NUM_TIME_REGS]; | |
60 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
61 | int ret; | |
62 | ||
63 | /* Copy RTC counting registers to static registers or latches */ | |
64 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
65 | TPS65910_RTC_CTRL_GET_TIME, TPS65910_RTC_CTRL_GET_TIME); | |
66 | if (ret < 0) { | |
67 | dev_err(dev, "RTC CTRL reg update failed with err:%d\n", ret); | |
68 | return ret; | |
69 | } | |
70 | ||
71 | ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, rtc_data, | |
72 | NUM_TIME_REGS); | |
73 | if (ret < 0) { | |
74 | dev_err(dev, "reading from RTC failed with err:%d\n", ret); | |
75 | return ret; | |
76 | } | |
77 | ||
78 | tm->tm_sec = bcd2bin(rtc_data[0]); | |
79 | tm->tm_min = bcd2bin(rtc_data[1]); | |
80 | tm->tm_hour = bcd2bin(rtc_data[2]); | |
81 | tm->tm_mday = bcd2bin(rtc_data[3]); | |
82 | tm->tm_mon = bcd2bin(rtc_data[4]) - 1; | |
83 | tm->tm_year = bcd2bin(rtc_data[5]) + 100; | |
84 | ||
85 | return ret; | |
86 | } | |
87 | ||
88 | static int tps65910_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
89 | { | |
90 | unsigned char rtc_data[NUM_TIME_REGS]; | |
91 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
92 | int ret; | |
93 | ||
94 | rtc_data[0] = bin2bcd(tm->tm_sec); | |
95 | rtc_data[1] = bin2bcd(tm->tm_min); | |
96 | rtc_data[2] = bin2bcd(tm->tm_hour); | |
97 | rtc_data[3] = bin2bcd(tm->tm_mday); | |
98 | rtc_data[4] = bin2bcd(tm->tm_mon + 1); | |
99 | rtc_data[5] = bin2bcd(tm->tm_year - 100); | |
100 | ||
101 | /* Stop RTC while updating the RTC time registers */ | |
102 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
103 | TPS65910_RTC_CTRL_STOP_RTC, 0); | |
104 | if (ret < 0) { | |
105 | dev_err(dev, "RTC stop failed with err:%d\n", ret); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | /* update all the time registers in one shot */ | |
110 | ret = regmap_bulk_write(tps->regmap, TPS65910_SECONDS, rtc_data, | |
111 | NUM_TIME_REGS); | |
112 | if (ret < 0) { | |
113 | dev_err(dev, "rtc_set_time error %d\n", ret); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | /* Start back RTC */ | |
118 | ret = regmap_update_bits(tps->regmap, TPS65910_RTC_CTRL, | |
119 | TPS65910_RTC_CTRL_STOP_RTC, 1); | |
120 | if (ret < 0) | |
121 | dev_err(dev, "RTC start failed with err:%d\n", ret); | |
122 | ||
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * Gets current tps65910 RTC alarm time. | |
128 | */ | |
129 | static int tps65910_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
130 | { | |
131 | unsigned char alarm_data[NUM_TIME_REGS]; | |
132 | u32 int_val; | |
133 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
134 | int ret; | |
135 | ||
136 | ret = regmap_bulk_read(tps->regmap, TPS65910_SECONDS, alarm_data, | |
137 | NUM_TIME_REGS); | |
138 | if (ret < 0) { | |
139 | dev_err(dev, "rtc_read_alarm error %d\n", ret); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | alm->time.tm_sec = bcd2bin(alarm_data[0]); | |
144 | alm->time.tm_min = bcd2bin(alarm_data[1]); | |
145 | alm->time.tm_hour = bcd2bin(alarm_data[2]); | |
146 | alm->time.tm_mday = bcd2bin(alarm_data[3]); | |
147 | alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; | |
148 | alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; | |
149 | ||
150 | ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, &int_val); | |
151 | if (ret < 0) | |
152 | return ret; | |
153 | ||
154 | if (int_val & TPS65910_RTC_INTERRUPTS_IT_ALARM) | |
155 | alm->enabled = 1; | |
156 | ||
157 | return ret; | |
158 | } | |
159 | ||
160 | static int tps65910_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
161 | { | |
162 | unsigned char alarm_data[NUM_TIME_REGS]; | |
163 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
164 | int ret; | |
165 | ||
166 | ret = tps65910_rtc_alarm_irq_enable(dev, 0); | |
167 | if (ret) | |
168 | return ret; | |
169 | ||
170 | alarm_data[0] = bin2bcd(alm->time.tm_sec); | |
171 | alarm_data[1] = bin2bcd(alm->time.tm_min); | |
172 | alarm_data[2] = bin2bcd(alm->time.tm_hour); | |
173 | alarm_data[3] = bin2bcd(alm->time.tm_mday); | |
174 | alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); | |
175 | alarm_data[5] = bin2bcd(alm->time.tm_year - 100); | |
176 | ||
177 | /* update all the alarm registers in one shot */ | |
178 | ret = regmap_bulk_write(tps->regmap, TPS65910_ALARM_SECONDS, | |
179 | alarm_data, NUM_TIME_REGS); | |
180 | if (ret) { | |
181 | dev_err(dev, "rtc_set_alarm error %d\n", ret); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | if (alm->enabled) | |
186 | ret = tps65910_rtc_alarm_irq_enable(dev, 1); | |
187 | ||
188 | return ret; | |
189 | } | |
190 | ||
191 | static irqreturn_t tps65910_rtc_interrupt(int irq, void *rtc) | |
192 | { | |
193 | struct device *dev = rtc; | |
194 | unsigned long events = 0; | |
195 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
196 | struct tps65910_rtc *tps_rtc = dev_get_drvdata(dev); | |
197 | int ret; | |
198 | u32 rtc_reg; | |
199 | ||
200 | ret = regmap_read(tps->regmap, TPS65910_RTC_STATUS, &rtc_reg); | |
201 | if (ret) | |
202 | return IRQ_NONE; | |
203 | ||
204 | if (rtc_reg & TPS65910_RTC_STATUS_ALARM) | |
205 | events = RTC_IRQF | RTC_AF; | |
206 | ||
207 | ret = regmap_write(tps->regmap, TPS65910_RTC_STATUS, rtc_reg); | |
208 | if (ret) | |
209 | return IRQ_NONE; | |
210 | ||
211 | /* Notify RTC core on event */ | |
212 | rtc_update_irq(tps_rtc->rtc, 1, events); | |
213 | ||
214 | return IRQ_HANDLED; | |
215 | } | |
216 | ||
217 | static const struct rtc_class_ops tps65910_rtc_ops = { | |
218 | .read_time = tps65910_rtc_read_time, | |
219 | .set_time = tps65910_rtc_set_time, | |
220 | .read_alarm = tps65910_rtc_read_alarm, | |
221 | .set_alarm = tps65910_rtc_set_alarm, | |
222 | .alarm_irq_enable = tps65910_rtc_alarm_irq_enable, | |
223 | }; | |
224 | ||
225 | static int __devinit tps65910_rtc_probe(struct platform_device *pdev) | |
226 | { | |
227 | struct tps65910 *tps65910 = NULL; | |
228 | struct tps65910_rtc *tps_rtc = NULL; | |
229 | struct tps65910_board *pmic_plat_data; | |
230 | int ret; | |
231 | int irq; | |
232 | u32 rtc_reg; | |
233 | ||
234 | tps65910 = dev_get_drvdata(pdev->dev.parent); | |
235 | ||
236 | tps_rtc = devm_kzalloc(&pdev->dev, sizeof(struct tps65910_rtc), | |
237 | GFP_KERNEL); | |
238 | if (!tps_rtc) | |
239 | return -ENOMEM; | |
240 | ||
241 | /* Clear pending interrupts */ | |
242 | ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg); | |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
246 | ret = regmap_write(tps65910->regmap, TPS65910_RTC_STATUS, rtc_reg); | |
247 | if (ret < 0) | |
248 | return ret; | |
249 | ||
250 | dev_dbg(&pdev->dev, "Enabling rtc-tps65910.\n"); | |
251 | rtc_reg = TPS65910_RTC_CTRL_STOP_RTC; | |
252 | ret = regmap_write(tps65910->regmap, TPS65910_RTC_CTRL, rtc_reg); | |
253 | if (ret < 0) | |
254 | return ret; | |
255 | ||
256 | pmic_plat_data = dev_get_platdata(tps65910->dev); | |
257 | irq = pmic_plat_data->irq_base; | |
258 | if (irq <= 0) { | |
259 | dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", | |
260 | irq); | |
261 | return ret; | |
262 | } | |
263 | ||
264 | irq += TPS65910_IRQ_RTC_ALARM; | |
265 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
266 | tps65910_rtc_interrupt, IRQF_TRIGGER_LOW, | |
267 | "rtc-tps65910", &pdev->dev); | |
268 | if (ret < 0) { | |
269 | dev_err(&pdev->dev, "IRQ is not free.\n"); | |
270 | return ret; | |
271 | } | |
272 | device_init_wakeup(&pdev->dev, 1); | |
273 | ||
274 | tps_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
275 | &tps65910_rtc_ops, THIS_MODULE); | |
276 | if (IS_ERR(tps_rtc->rtc)) { | |
277 | ret = PTR_ERR(tps_rtc->rtc); | |
278 | dev_err(&pdev->dev, "RTC device register: err %d\n", ret); | |
279 | return ret; | |
280 | } | |
281 | ||
282 | platform_set_drvdata(pdev, tps_rtc); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Disable tps65910 RTC interrupts. | |
289 | * Sets status flag to free. | |
290 | */ | |
291 | static int __devexit tps65910_rtc_remove(struct platform_device *pdev) | |
292 | { | |
293 | /* leave rtc running, but disable irqs */ | |
294 | struct rtc_device *rtc = platform_get_drvdata(pdev); | |
295 | ||
296 | tps65910_rtc_alarm_irq_enable(&rtc->dev, 0); | |
297 | ||
298 | rtc_device_unregister(rtc); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | #ifdef CONFIG_PM_SLEEP | |
303 | ||
304 | static int tps65910_rtc_suspend(struct device *dev) | |
305 | { | |
306 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
307 | u8 alarm = TPS65910_RTC_INTERRUPTS_IT_ALARM; | |
308 | int ret; | |
309 | ||
310 | /* Store current list of enabled interrupts*/ | |
311 | ret = regmap_read(tps->regmap, TPS65910_RTC_INTERRUPTS, | |
312 | &tps->rtc->irqstat); | |
313 | if (ret < 0) | |
314 | return ret; | |
315 | ||
316 | /* Enable RTC ALARM interrupt only */ | |
317 | return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, alarm); | |
318 | } | |
319 | ||
320 | static int tps65910_rtc_resume(struct device *dev) | |
321 | { | |
322 | struct tps65910 *tps = dev_get_drvdata(dev->parent); | |
323 | ||
324 | /* Restore list of enabled interrupts before suspend */ | |
325 | return regmap_write(tps->regmap, TPS65910_RTC_INTERRUPTS, | |
326 | tps->rtc->irqstat); | |
327 | } | |
328 | ||
329 | static const struct dev_pm_ops tps65910_rtc_pm_ops = { | |
330 | .suspend = tps65910_rtc_suspend, | |
331 | .resume = tps65910_rtc_resume, | |
332 | }; | |
333 | ||
334 | #define DEV_PM_OPS (&tps65910_rtc_pm_ops) | |
335 | #else | |
336 | #define DEV_PM_OPS NULL | |
337 | #endif | |
338 | ||
339 | static struct platform_driver tps65910_rtc_driver = { | |
340 | .probe = tps65910_rtc_probe, | |
341 | .remove = __devexit_p(tps65910_rtc_remove), | |
342 | .driver = { | |
343 | .owner = THIS_MODULE, | |
344 | .name = "tps65910-rtc", | |
345 | .pm = DEV_PM_OPS, | |
346 | }, | |
347 | }; | |
348 | ||
349 | module_platform_driver(tps65910_rtc_driver); | |
350 | MODULE_ALIAS("platform:rtc-tps65910"); | |
351 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
352 | MODULE_LICENSE("GPL"); |