Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 | /* * rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock * * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. * Author: Venu Byravarasu <vbyravarasu@nvidia.com> * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/mfd/rc5t583.h> struct rc5t583_rtc { struct rtc_device *rtc; /* To store the list of enabled interrupts, during system suspend */ u32 irqen; }; /* Total number of RTC registers needed to set time*/ #define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1) /* Total number of RTC registers needed to set Y-Alarm*/ #define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1) /* Set Y-Alarm interrupt */ #define SET_YAL BIT(5) /* Get Y-Alarm interrupt status*/ #define GET_YAL_STATUS BIT(3) static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); u8 val; /* Set Y-Alarm, based on 'enabled' */ val = enabled ? SET_YAL : 0; return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL, val); } /* * Gets current rc5t583 RTC time and date parameters. * * The RTC's time/alarm representation is not what gmtime(3) requires * Linux to use: * * - Months are 1..12 vs Linux 0-11 * - Years are 0..99 vs Linux 1900..N (we assume 21st century) */ static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); u8 rtc_data[NUM_TIME_REGS]; int ret; ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, NUM_TIME_REGS); if (ret < 0) { dev_err(dev, "RTC read time failed with err:%d\n", ret); return ret; } tm->tm_sec = bcd2bin(rtc_data[0]); tm->tm_min = bcd2bin(rtc_data[1]); tm->tm_hour = bcd2bin(rtc_data[2]); tm->tm_wday = bcd2bin(rtc_data[3]); tm->tm_mday = bcd2bin(rtc_data[4]); tm->tm_mon = bcd2bin(rtc_data[5]) - 1; tm->tm_year = bcd2bin(rtc_data[6]) + 100; return ret; } static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); unsigned char rtc_data[NUM_TIME_REGS]; int ret; rtc_data[0] = bin2bcd(tm->tm_sec); rtc_data[1] = bin2bcd(tm->tm_min); rtc_data[2] = bin2bcd(tm->tm_hour); rtc_data[3] = bin2bcd(tm->tm_wday); rtc_data[4] = bin2bcd(tm->tm_mday); rtc_data[5] = bin2bcd(tm->tm_mon + 1); rtc_data[6] = bin2bcd(tm->tm_year - 100); ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data, NUM_TIME_REGS); if (ret < 0) { dev_err(dev, "RTC set time failed with error %d\n", ret); return ret; } return ret; } static int rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); unsigned char alarm_data[NUM_YAL_REGS]; u32 interrupt_enable; int ret; ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, NUM_YAL_REGS); if (ret < 0) { dev_err(dev, "rtc_read_alarm error %d\n", ret); return ret; } alm->time.tm_sec = 0; alm->time.tm_min = bcd2bin(alarm_data[0]); alm->time.tm_hour = bcd2bin(alarm_data[1]); alm->time.tm_mday = bcd2bin(alarm_data[2]); alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1; alm->time.tm_year = bcd2bin(alarm_data[4]) + 100; ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable); if (ret < 0) return ret; /* check if YALE is set */ if (interrupt_enable & SET_YAL) alm->enabled = 1; return ret; } static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); unsigned char alarm_data[NUM_YAL_REGS]; int ret; ret = rc5t583_rtc_alarm_irq_enable(dev, 0); if (ret) return ret; alarm_data[0] = bin2bcd(alm->time.tm_min); alarm_data[1] = bin2bcd(alm->time.tm_hour); alarm_data[2] = bin2bcd(alm->time.tm_mday); alarm_data[3] = bin2bcd(alm->time.tm_mon + 1); alarm_data[4] = bin2bcd(alm->time.tm_year - 100); ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data, NUM_YAL_REGS); if (ret) { dev_err(dev, "rtc_set_alarm error %d\n", ret); return ret; } if (alm->enabled) ret = rc5t583_rtc_alarm_irq_enable(dev, 1); return ret; } static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc) { struct device *dev = rtc; struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); unsigned long events = 0; int ret; u32 rtc_reg; ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg); if (ret < 0) return IRQ_NONE; if (rtc_reg & GET_YAL_STATUS) { events = RTC_IRQF | RTC_AF; /* clear pending Y-alarm interrupt bit */ rtc_reg &= ~GET_YAL_STATUS; } ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg); if (ret) return IRQ_NONE; /* Notify RTC core on event */ rtc_update_irq(rc5t583_rtc->rtc, 1, events); return IRQ_HANDLED; } static const struct rtc_class_ops rc5t583_rtc_ops = { .read_time = rc5t583_rtc_read_time, .set_time = rc5t583_rtc_set_time, .read_alarm = rc5t583_rtc_read_alarm, .set_alarm = rc5t583_rtc_set_alarm, .alarm_irq_enable = rc5t583_rtc_alarm_irq_enable, }; static int rc5t583_rtc_probe(struct platform_device *pdev) { struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); struct rc5t583_rtc *ricoh_rtc; struct rc5t583_platform_data *pmic_plat_data; int ret; int irq; ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc), GFP_KERNEL); if (!ricoh_rtc) return -ENOMEM; platform_set_drvdata(pdev, ricoh_rtc); /* Clear pending interrupts */ ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0); if (ret < 0) return ret; /* clear RTC Adjust register */ ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0); if (ret < 0) { dev_err(&pdev->dev, "unable to program rtc_adjust reg\n"); return -EBUSY; } pmic_plat_data = dev_get_platdata(rc5t583->dev); irq = pmic_plat_data->irq_base; if (irq <= 0) { dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n", irq); return ret; } irq += RC5T583_IRQ_YALE; ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW, "rtc-rc5t583", &pdev->dev); if (ret < 0) { dev_err(&pdev->dev, "IRQ is not free.\n"); return ret; } device_init_wakeup(&pdev->dev, 1); ricoh_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &rc5t583_rtc_ops, THIS_MODULE); if (IS_ERR(ricoh_rtc->rtc)) { ret = PTR_ERR(ricoh_rtc->rtc); dev_err(&pdev->dev, "RTC device register: err %d\n", ret); return ret; } return 0; } /* * Disable rc5t583 RTC interrupts. * Sets status flag to free. */ static int rc5t583_rtc_remove(struct platform_device *pdev) { struct rc5t583_rtc *rc5t583_rtc = platform_get_drvdata(pdev); rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0); return 0; } #ifdef CONFIG_PM_SLEEP static int rc5t583_rtc_suspend(struct device *dev) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); int ret; /* Store current list of enabled interrupts*/ ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &rc5t583_rtc->irqen); return ret; } static int rc5t583_rtc_resume(struct device *dev) { struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent); struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev); /* Restore list of enabled interrupts before suspend */ return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1, rc5t583_rtc->irqen); } #endif static SIMPLE_DEV_PM_OPS(rc5t583_rtc_pm_ops, rc5t583_rtc_suspend, rc5t583_rtc_resume); static struct platform_driver rc5t583_rtc_driver = { .probe = rc5t583_rtc_probe, .remove = rc5t583_rtc_remove, .driver = { .name = "rtc-rc5t583", .pm = &rc5t583_rtc_pm_ops, }, }; module_platform_driver(rc5t583_rtc_driver); MODULE_ALIAS("platform:rtc-rc5t583"); MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); MODULE_LICENSE("GPL v2"); |