Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Real time clock driver for DA9052 |
| 3 | * |
| 4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. |
| 5 | * |
| 6 | * Author: Dajun Dajun Chen <dajun.chen@diasemi.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/rtc.h> |
| 18 | |
| 19 | #include <linux/mfd/da9052/da9052.h> |
| 20 | #include <linux/mfd/da9052/reg.h> |
| 21 | |
| 22 | #define rtc_err(da9052, fmt, ...) \ |
| 23 | dev_err(da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__) |
| 24 | |
| 25 | struct da9052_rtc { |
| 26 | struct rtc_device *rtc; |
| 27 | struct da9052 *da9052; |
| 28 | int irq; |
| 29 | }; |
| 30 | |
| 31 | static int da9052_rtc_enable_alarm(struct da9052 *da9052, bool enable) |
| 32 | { |
| 33 | int ret; |
| 34 | if (enable) { |
| 35 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, |
| 36 | DA9052_ALARM_Y_ALARM_ON, |
| 37 | DA9052_ALARM_Y_ALARM_ON); |
| 38 | if (ret != 0) |
| 39 | rtc_err(da9052, "Failed to enable ALM: %d\n", ret); |
| 40 | } else { |
| 41 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, |
| 42 | DA9052_ALARM_Y_ALARM_ON, 0); |
| 43 | if (ret != 0) |
| 44 | rtc_err(da9052, "Write error: %d\n", ret); |
| 45 | } |
| 46 | return ret; |
| 47 | } |
| 48 | |
| 49 | static irqreturn_t da9052_rtc_irq(int irq, void *data) |
| 50 | { |
| 51 | struct da9052_rtc *rtc = data; |
| 52 | int ret; |
| 53 | |
| 54 | ret = da9052_reg_read(rtc->da9052, DA9052_ALARM_MI_REG); |
| 55 | if (ret < 0) { |
| 56 | rtc_err(rtc->da9052, "Read error: %d\n", ret); |
| 57 | return IRQ_NONE; |
| 58 | } |
| 59 | |
| 60 | if (ret & DA9052_ALARMMI_ALARMTYPE) { |
| 61 | da9052_rtc_enable_alarm(rtc->da9052, 0); |
| 62 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); |
| 63 | } else |
| 64 | rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_PF); |
| 65 | |
| 66 | return IRQ_HANDLED; |
| 67 | } |
| 68 | |
| 69 | static int da9052_read_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) |
| 70 | { |
| 71 | int ret; |
| 72 | uint8_t v[5]; |
| 73 | |
| 74 | ret = da9052_group_read(da9052, DA9052_ALARM_MI_REG, 5, v); |
| 75 | if (ret != 0) { |
| 76 | rtc_err(da9052, "Failed to group read ALM: %d\n", ret); |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | rtc_tm->tm_year = (v[4] & DA9052_RTC_YEAR) + 100; |
| 81 | rtc_tm->tm_mon = (v[3] & DA9052_RTC_MONTH) - 1; |
| 82 | rtc_tm->tm_mday = v[2] & DA9052_RTC_DAY; |
| 83 | rtc_tm->tm_hour = v[1] & DA9052_RTC_HOUR; |
| 84 | rtc_tm->tm_min = v[0] & DA9052_RTC_MIN; |
| 85 | |
| 86 | ret = rtc_valid_tm(rtc_tm); |
| 87 | if (ret != 0) |
| 88 | return ret; |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | static int da9052_set_alarm(struct da9052 *da9052, struct rtc_time *rtc_tm) |
| 93 | { |
| 94 | int ret; |
| 95 | uint8_t v[3]; |
| 96 | |
| 97 | rtc_tm->tm_year -= 100; |
| 98 | rtc_tm->tm_mon += 1; |
| 99 | |
| 100 | ret = da9052_reg_update(da9052, DA9052_ALARM_MI_REG, |
| 101 | DA9052_RTC_MIN, rtc_tm->tm_min); |
| 102 | if (ret != 0) { |
| 103 | rtc_err(da9052, "Failed to write ALRM MIN: %d\n", ret); |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | v[0] = rtc_tm->tm_hour; |
| 108 | v[1] = rtc_tm->tm_mday; |
| 109 | v[2] = rtc_tm->tm_mon; |
| 110 | |
| 111 | ret = da9052_group_write(da9052, DA9052_ALARM_H_REG, 3, v); |
| 112 | if (ret < 0) |
| 113 | return ret; |
| 114 | |
| 115 | ret = da9052_reg_update(da9052, DA9052_ALARM_Y_REG, |
| 116 | DA9052_RTC_YEAR, rtc_tm->tm_year); |
| 117 | if (ret != 0) |
| 118 | rtc_err(da9052, "Failed to write ALRM YEAR: %d\n", ret); |
| 119 | |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | static int da9052_rtc_get_alarm_status(struct da9052 *da9052) |
| 124 | { |
| 125 | int ret; |
| 126 | |
| 127 | ret = da9052_reg_read(da9052, DA9052_ALARM_Y_REG); |
| 128 | if (ret < 0) { |
| 129 | rtc_err(da9052, "Failed to read ALM: %d\n", ret); |
| 130 | return ret; |
| 131 | } |
| 132 | ret &= DA9052_ALARM_Y_ALARM_ON; |
| 133 | return (ret > 0) ? 1 : 0; |
| 134 | } |
| 135 | |
| 136 | static int da9052_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm) |
| 137 | { |
| 138 | struct da9052_rtc *rtc = dev_get_drvdata(dev); |
| 139 | uint8_t v[6]; |
| 140 | int ret; |
| 141 | |
| 142 | ret = da9052_group_read(rtc->da9052, DA9052_COUNT_S_REG, 6, v); |
| 143 | if (ret < 0) { |
| 144 | rtc_err(rtc->da9052, "Failed to read RTC time : %d\n", ret); |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | rtc_tm->tm_year = (v[5] & DA9052_RTC_YEAR) + 100; |
| 149 | rtc_tm->tm_mon = (v[4] & DA9052_RTC_MONTH) - 1; |
| 150 | rtc_tm->tm_mday = v[3] & DA9052_RTC_DAY; |
| 151 | rtc_tm->tm_hour = v[2] & DA9052_RTC_HOUR; |
| 152 | rtc_tm->tm_min = v[1] & DA9052_RTC_MIN; |
| 153 | rtc_tm->tm_sec = v[0] & DA9052_RTC_SEC; |
| 154 | |
| 155 | ret = rtc_valid_tm(rtc_tm); |
| 156 | if (ret != 0) { |
| 157 | rtc_err(rtc->da9052, "rtc_valid_tm failed: %d\n", ret); |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int da9052_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 165 | { |
| 166 | struct da9052_rtc *rtc; |
| 167 | uint8_t v[6]; |
| 168 | |
| 169 | rtc = dev_get_drvdata(dev); |
| 170 | |
| 171 | v[0] = tm->tm_sec; |
| 172 | v[1] = tm->tm_min; |
| 173 | v[2] = tm->tm_hour; |
| 174 | v[3] = tm->tm_mday; |
| 175 | v[4] = tm->tm_mon + 1; |
| 176 | v[5] = tm->tm_year - 100; |
| 177 | |
| 178 | return da9052_group_write(rtc->da9052, DA9052_COUNT_S_REG, 6, v); |
| 179 | } |
| 180 | |
| 181 | static int da9052_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 182 | { |
| 183 | int ret; |
| 184 | struct rtc_time *tm = &alrm->time; |
| 185 | struct da9052_rtc *rtc = dev_get_drvdata(dev); |
| 186 | |
| 187 | ret = da9052_read_alarm(rtc->da9052, tm); |
| 188 | |
| 189 | if (ret) |
| 190 | return ret; |
| 191 | |
| 192 | alrm->enabled = da9052_rtc_get_alarm_status(rtc->da9052); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static int da9052_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 198 | { |
| 199 | int ret; |
| 200 | struct rtc_time *tm = &alrm->time; |
| 201 | struct da9052_rtc *rtc = dev_get_drvdata(dev); |
| 202 | |
| 203 | ret = da9052_rtc_enable_alarm(rtc->da9052, 0); |
| 204 | if (ret < 0) |
| 205 | return ret; |
| 206 | |
| 207 | ret = da9052_set_alarm(rtc->da9052, tm); |
| 208 | if (ret) |
| 209 | return ret; |
| 210 | |
| 211 | ret = da9052_rtc_enable_alarm(rtc->da9052, 1); |
| 212 | |
| 213 | return ret; |
| 214 | } |
| 215 | |
| 216 | static int da9052_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
| 217 | { |
| 218 | struct da9052_rtc *rtc = dev_get_drvdata(dev); |
| 219 | |
| 220 | return da9052_rtc_enable_alarm(rtc->da9052, enabled); |
| 221 | } |
| 222 | |
| 223 | static const struct rtc_class_ops da9052_rtc_ops = { |
| 224 | .read_time = da9052_rtc_read_time, |
| 225 | .set_time = da9052_rtc_set_time, |
| 226 | .read_alarm = da9052_rtc_read_alarm, |
| 227 | .set_alarm = da9052_rtc_set_alarm, |
| 228 | .alarm_irq_enable = da9052_rtc_alarm_irq_enable, |
| 229 | }; |
| 230 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 231 | static int da9052_rtc_probe(struct platform_device *pdev) |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 232 | { |
| 233 | struct da9052_rtc *rtc; |
| 234 | int ret; |
| 235 | |
| 236 | rtc = devm_kzalloc(&pdev->dev, sizeof(struct da9052_rtc), GFP_KERNEL); |
| 237 | if (!rtc) |
| 238 | return -ENOMEM; |
| 239 | |
| 240 | rtc->da9052 = dev_get_drvdata(pdev->dev.parent); |
| 241 | platform_set_drvdata(pdev, rtc); |
Ashish Jangam | 925e8ea | 2013-03-22 15:04:44 -0700 | [diff] [blame] | 242 | rtc->irq = DA9052_IRQ_ALARM; |
| 243 | ret = da9052_request_irq(rtc->da9052, rtc->irq, "ALM", |
| 244 | da9052_rtc_irq, rtc); |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 245 | if (ret != 0) { |
| 246 | rtc_err(rtc->da9052, "irq registration failed: %d\n", ret); |
Devendra Naga | 007def0 | 2012-07-30 14:41:54 -0700 | [diff] [blame] | 247 | return ret; |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Jingoo Han | 3689cd7 | 2013-04-29 16:18:57 -0700 | [diff] [blame^] | 250 | rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 251 | &da9052_rtc_ops, THIS_MODULE); |
Jingoo Han | 27239a1 | 2013-02-21 16:45:42 -0800 | [diff] [blame] | 252 | if (IS_ERR(rtc->rtc)) |
| 253 | return PTR_ERR(rtc->rtc); |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 254 | |
| 255 | return 0; |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 258 | static int da9052_rtc_remove(struct platform_device *pdev) |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 259 | { |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 260 | platform_set_drvdata(pdev, NULL); |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static struct platform_driver da9052_rtc_driver = { |
| 266 | .probe = da9052_rtc_probe, |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 267 | .remove = da9052_rtc_remove, |
Ashish Jangam | fef931f | 2012-03-23 15:02:36 -0700 | [diff] [blame] | 268 | .driver = { |
| 269 | .name = "da9052-rtc", |
| 270 | .owner = THIS_MODULE, |
| 271 | }, |
| 272 | }; |
| 273 | |
| 274 | module_platform_driver(da9052_rtc_driver); |
| 275 | |
| 276 | MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); |
| 277 | MODULE_DESCRIPTION("RTC driver for Dialog DA9052 PMIC"); |
| 278 | MODULE_LICENSE("GPL"); |
| 279 | MODULE_ALIAS("platform:da9052-rtc"); |