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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
90829c08 VB |
2 | /* |
3 | * rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock | |
4 | * | |
5 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | |
6 | * Author: Venu Byravarasu <vbyravarasu@nvidia.com> | |
9952f691 | 7 | */ |
90829c08 VB |
8 | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/rtc.h> | |
15 | #include <linux/bcd.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/mfd/rc5t583.h> | |
19 | ||
20 | struct rc5t583_rtc { | |
21 | struct rtc_device *rtc; | |
22 | /* To store the list of enabled interrupts, during system suspend */ | |
23 | u32 irqen; | |
24 | }; | |
25 | ||
26 | /* Total number of RTC registers needed to set time*/ | |
27 | #define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1) | |
28 | ||
29 | /* Total number of RTC registers needed to set Y-Alarm*/ | |
30 | #define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1) | |
31 | ||
32 | /* Set Y-Alarm interrupt */ | |
33 | #define SET_YAL BIT(5) | |
34 | ||
35 | /* Get Y-Alarm interrupt status*/ | |
36 | #define GET_YAL_STATUS BIT(3) | |
37 | ||
38 | static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) | |
39 | { | |
40 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
41 | u8 val; | |
42 | ||
43 | /* Set Y-Alarm, based on 'enabled' */ | |
44 | val = enabled ? SET_YAL : 0; | |
45 | ||
46 | return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL, | |
47 | val); | |
48 | } | |
49 | ||
50 | /* | |
51 | * Gets current rc5t583 RTC time and date parameters. | |
52 | * | |
53 | * The RTC's time/alarm representation is not what gmtime(3) requires | |
54 | * Linux to use: | |
55 | * | |
56 | * - Months are 1..12 vs Linux 0-11 | |
57 | * - Years are 0..99 vs Linux 1900..N (we assume 21st century) | |
58 | */ | |
59 | static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
60 | { | |
61 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
62 | u8 rtc_data[NUM_TIME_REGS]; | |
63 | int ret; | |
64 | ||
65 | ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, | |
66 | NUM_TIME_REGS); | |
67 | if (ret < 0) { | |
68 | dev_err(dev, "RTC read time failed with err:%d\n", ret); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | tm->tm_sec = bcd2bin(rtc_data[0]); | |
73 | tm->tm_min = bcd2bin(rtc_data[1]); | |
74 | tm->tm_hour = bcd2bin(rtc_data[2]); | |
75 | tm->tm_wday = bcd2bin(rtc_data[3]); | |
76 | tm->tm_mday = bcd2bin(rtc_data[4]); | |
77 | tm->tm_mon = bcd2bin(rtc_data[5]) - 1; | |
78 | tm->tm_year = bcd2bin(rtc_data[6]) + 100; | |
79 | ||
80 | return ret; | |
81 | } | |
82 | ||
83 | static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
84 | { | |
85 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
86 | unsigned char rtc_data[NUM_TIME_REGS]; | |
87 | int ret; | |
88 | ||
89 | rtc_data[0] = bin2bcd(tm->tm_sec); | |
90 | rtc_data[1] = bin2bcd(tm->tm_min); | |
91 | rtc_data[2] = bin2bcd(tm->tm_hour); | |
92 | rtc_data[3] = bin2bcd(tm->tm_wday); | |
93 | rtc_data[4] = bin2bcd(tm->tm_mday); | |
94 | rtc_data[5] = bin2bcd(tm->tm_mon + 1); | |
95 | rtc_data[6] = bin2bcd(tm->tm_year - 100); | |
96 | ||
97 | ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, | |
98 | NUM_TIME_REGS); | |
99 | if (ret < 0) { | |
100 | dev_err(dev, "RTC set time failed with error %d\n", ret); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | return ret; | |
105 | } | |
106 | ||
107 | static int rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
108 | { | |
109 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
110 | unsigned char alarm_data[NUM_YAL_REGS]; | |
111 | u32 interrupt_enable; | |
112 | int ret; | |
113 | ||
114 | ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, | |
115 | NUM_YAL_REGS); | |
116 | if (ret < 0) { | |
117 | dev_err(dev, "rtc_read_alarm error %d\n", ret); | |
118 | return ret; | |
119 | } | |
120 | ||
d2c92705 | 121 | alm->time.tm_sec = 0; |
90829c08 VB |
122 | alm->time.tm_min = bcd2bin(alarm_data[0]); |
123 | alm->time.tm_hour = bcd2bin(alarm_data[1]); | |
124 | alm->time.tm_mday = bcd2bin(alarm_data[2]); | |
125 | alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1; | |
126 | alm->time.tm_year = bcd2bin(alarm_data[4]) + 100; | |
127 | ||
128 | ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable); | |
129 | if (ret < 0) | |
130 | return ret; | |
131 | ||
132 | /* check if YALE is set */ | |
133 | if (interrupt_enable & SET_YAL) | |
134 | alm->enabled = 1; | |
135 | ||
136 | return ret; | |
137 | } | |
138 | ||
139 | static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
140 | { | |
141 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
142 | unsigned char alarm_data[NUM_YAL_REGS]; | |
143 | int ret; | |
144 | ||
145 | ret = rc5t583_rtc_alarm_irq_enable(dev, 0); | |
146 | if (ret) | |
147 | return ret; | |
148 | ||
149 | alarm_data[0] = bin2bcd(alm->time.tm_min); | |
150 | alarm_data[1] = bin2bcd(alm->time.tm_hour); | |
151 | alarm_data[2] = bin2bcd(alm->time.tm_mday); | |
152 | alarm_data[3] = bin2bcd(alm->time.tm_mon + 1); | |
153 | alarm_data[4] = bin2bcd(alm->time.tm_year - 100); | |
154 | ||
155 | ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, | |
156 | NUM_YAL_REGS); | |
157 | if (ret) { | |
158 | dev_err(dev, "rtc_set_alarm error %d\n", ret); | |
159 | return ret; | |
160 | } | |
161 | ||
162 | if (alm->enabled) | |
163 | ret = rc5t583_rtc_alarm_irq_enable(dev, 1); | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
168 | static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc) | |
169 | { | |
170 | struct device *dev = rtc; | |
171 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
172 | struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); | |
173 | unsigned long events = 0; | |
174 | int ret; | |
175 | u32 rtc_reg; | |
176 | ||
177 | ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg); | |
178 | if (ret < 0) | |
179 | return IRQ_NONE; | |
180 | ||
181 | if (rtc_reg & GET_YAL_STATUS) { | |
182 | events = RTC_IRQF | RTC_AF; | |
183 | /* clear pending Y-alarm interrupt bit */ | |
184 | rtc_reg &= ~GET_YAL_STATUS; | |
185 | } | |
186 | ||
187 | ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg); | |
188 | if (ret) | |
189 | return IRQ_NONE; | |
190 | ||
191 | /* Notify RTC core on event */ | |
192 | rtc_update_irq(rc5t583_rtc->rtc, 1, events); | |
193 | ||
194 | return IRQ_HANDLED; | |
195 | } | |
196 | ||
197 | static const struct rtc_class_ops rc5t583_rtc_ops = { | |
198 | .read_time = rc5t583_rtc_read_time, | |
199 | .set_time = rc5t583_rtc_set_time, | |
200 | .read_alarm = rc5t583_rtc_read_alarm, | |
201 | .set_alarm = rc5t583_rtc_set_alarm, | |
202 | .alarm_irq_enable = rc5t583_rtc_alarm_irq_enable, | |
203 | }; | |
204 | ||
5a167f45 | 205 | static int rc5t583_rtc_probe(struct platform_device *pdev) |
90829c08 VB |
206 | { |
207 | struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); | |
208 | struct rc5t583_rtc *ricoh_rtc; | |
209 | struct rc5t583_platform_data *pmic_plat_data; | |
210 | int ret; | |
211 | int irq; | |
212 | ||
213 | ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc), | |
214 | GFP_KERNEL); | |
215 | if (!ricoh_rtc) | |
216 | return -ENOMEM; | |
217 | ||
218 | platform_set_drvdata(pdev, ricoh_rtc); | |
219 | ||
220 | /* Clear pending interrupts */ | |
221 | ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0); | |
222 | if (ret < 0) | |
223 | return ret; | |
224 | ||
225 | /* clear RTC Adjust register */ | |
226 | ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0); | |
227 | if (ret < 0) { | |
228 | dev_err(&pdev->dev, "unable to program rtc_adjust reg\n"); | |
229 | return -EBUSY; | |
230 | } | |
231 | ||
232 | pmic_plat_data = dev_get_platdata(rc5t583->dev); | |
233 | irq = pmic_plat_data->irq_base; | |
234 | if (irq <= 0) { | |
235 | dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", | |
236 | irq); | |
237 | return ret; | |
238 | } | |
239 | ||
240 | irq += RC5T583_IRQ_YALE; | |
241 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
242 | rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW, | |
243 | "rtc-rc5t583", &pdev->dev); | |
244 | if (ret < 0) { | |
245 | dev_err(&pdev->dev, "IRQ is not free.\n"); | |
246 | return ret; | |
247 | } | |
248 | device_init_wakeup(&pdev->dev, 1); | |
249 | ||
8b7980db | 250 | ricoh_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
90829c08 VB |
251 | &rc5t583_rtc_ops, THIS_MODULE); |
252 | if (IS_ERR(ricoh_rtc->rtc)) { | |
253 | ret = PTR_ERR(ricoh_rtc->rtc); | |
254 | dev_err(&pdev->dev, "RTC device register: err %d\n", ret); | |
255 | return ret; | |
256 | } | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Disable rc5t583 RTC interrupts. | |
263 | * Sets status flag to free. | |
264 | */ | |
5a167f45 | 265 | static int rc5t583_rtc_remove(struct platform_device *pdev) |
90829c08 | 266 | { |
e1c2f989 | 267 | struct rc5t583_rtc *rc5t583_rtc = platform_get_drvdata(pdev); |
90829c08 VB |
268 | |
269 | rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0); | |
90829c08 VB |
270 | return 0; |
271 | } | |
272 | ||
273 | #ifdef CONFIG_PM_SLEEP | |
90829c08 VB |
274 | static int rc5t583_rtc_suspend(struct device *dev) |
275 | { | |
276 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
277 | struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); | |
278 | int ret; | |
279 | ||
280 | /* Store current list of enabled interrupts*/ | |
281 | ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, | |
282 | &rc5t583_rtc->irqen); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int rc5t583_rtc_resume(struct device *dev) | |
287 | { | |
288 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); | |
289 | struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); | |
290 | ||
291 | /* Restore list of enabled interrupts before suspend */ | |
292 | return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1, | |
293 | rc5t583_rtc->irqen); | |
294 | } | |
90829c08 VB |
295 | #endif |
296 | ||
29756a52 JH |
297 | static SIMPLE_DEV_PM_OPS(rc5t583_rtc_pm_ops, rc5t583_rtc_suspend, |
298 | rc5t583_rtc_resume); | |
299 | ||
90829c08 VB |
300 | static struct platform_driver rc5t583_rtc_driver = { |
301 | .probe = rc5t583_rtc_probe, | |
5a167f45 | 302 | .remove = rc5t583_rtc_remove, |
90829c08 | 303 | .driver = { |
90829c08 | 304 | .name = "rtc-rc5t583", |
29756a52 | 305 | .pm = &rc5t583_rtc_pm_ops, |
90829c08 VB |
306 | }, |
307 | }; | |
308 | ||
309 | module_platform_driver(rc5t583_rtc_driver); | |
310 | MODULE_ALIAS("platform:rtc-rc5t583"); | |
311 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
312 | MODULE_LICENSE("GPL v2"); |