Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Akshay Bhat | 1873 | 84.07% | 3 | 12.00% |
Bartosz Golaszewski | 272 | 12.21% | 12 | 48.00% |
Alexandre Belloni | 45 | 2.02% | 6 | 24.00% |
Javier Martinez Canillas | 30 | 1.35% | 1 | 4.00% |
Uwe Kleine-König | 3 | 0.13% | 1 | 4.00% |
Fabien Lahoudere | 3 | 0.13% | 1 | 4.00% |
Thomas Gleixner | 2 | 0.09% | 1 | 4.00% |
Total | 2228 | 25 |
// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Epson RTC module RX-8010 SJ * * Copyright(C) Timesys Corporation 2015 * Copyright(C) General Electric Company 2015 */ #include <linux/bcd.h> #include <linux/bitops.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/rtc.h> #define RX8010_SEC 0x10 #define RX8010_MIN 0x11 #define RX8010_HOUR 0x12 #define RX8010_WDAY 0x13 #define RX8010_MDAY 0x14 #define RX8010_MONTH 0x15 #define RX8010_YEAR 0x16 #define RX8010_RESV17 0x17 #define RX8010_ALMIN 0x18 #define RX8010_ALHOUR 0x19 #define RX8010_ALWDAY 0x1A #define RX8010_TCOUNT0 0x1B #define RX8010_TCOUNT1 0x1C #define RX8010_EXT 0x1D #define RX8010_FLAG 0x1E #define RX8010_CTRL 0x1F /* 0x20 to 0x2F are user registers */ #define RX8010_RESV30 0x30 #define RX8010_RESV31 0x31 #define RX8010_IRQ 0x32 #define RX8010_EXT_WADA BIT(3) #define RX8010_FLAG_VLF BIT(1) #define RX8010_FLAG_AF BIT(3) #define RX8010_FLAG_TF BIT(4) #define RX8010_FLAG_UF BIT(5) #define RX8010_CTRL_AIE BIT(3) #define RX8010_CTRL_UIE BIT(5) #define RX8010_CTRL_STOP BIT(6) #define RX8010_CTRL_TEST BIT(7) #define RX8010_ALARM_AE BIT(7) static const struct i2c_device_id rx8010_id[] = { { "rx8010", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, rx8010_id); static const __maybe_unused struct of_device_id rx8010_of_match[] = { { .compatible = "epson,rx8010" }, { } }; MODULE_DEVICE_TABLE(of, rx8010_of_match); struct rx8010_data { struct regmap *regs; struct rtc_device *rtc; u8 ctrlreg; }; static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id) { struct i2c_client *client = dev_id; struct rx8010_data *rx8010 = i2c_get_clientdata(client); int flagreg, err; rtc_lock(rx8010->rtc); err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) { rtc_unlock(rx8010->rtc); return IRQ_NONE; } if (flagreg & RX8010_FLAG_VLF) dev_warn(&client->dev, "Frequency stop detected\n"); if (flagreg & RX8010_FLAG_TF) { flagreg &= ~RX8010_FLAG_TF; rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF); } if (flagreg & RX8010_FLAG_AF) { flagreg &= ~RX8010_FLAG_AF; rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF); } if (flagreg & RX8010_FLAG_UF) { flagreg &= ~RX8010_FLAG_UF; rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF); } err = regmap_write(rx8010->regs, RX8010_FLAG, flagreg); rtc_unlock(rx8010->rtc); return err ? IRQ_NONE : IRQ_HANDLED; } static int rx8010_get_time(struct device *dev, struct rtc_time *dt) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 date[RX8010_YEAR - RX8010_SEC + 1]; int flagreg, err; err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; if (flagreg & RX8010_FLAG_VLF) { dev_warn(dev, "Frequency stop detected\n"); return -EINVAL; } err = regmap_bulk_read(rx8010->regs, RX8010_SEC, date, sizeof(date)); if (err) return err; dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f); dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f); dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f); dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f); dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1; dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100; dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f); return 0; } static int rx8010_set_time(struct device *dev, struct rtc_time *dt) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 date[RX8010_YEAR - RX8010_SEC + 1]; int err; /* set STOP bit before changing clock/calendar */ err = regmap_set_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); if (err) return err; date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec); date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min); date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour); date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday); date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1); date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100); date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday); err = regmap_bulk_write(rx8010->regs, RX8010_SEC, date, sizeof(date)); if (err) return err; /* clear STOP bit after changing clock/calendar */ err = regmap_clear_bits(rx8010->regs, RX8010_CTRL, RX8010_CTRL_STOP); if (err) return err; err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_VLF); if (err) return err; return 0; } static int rx8010_init(struct device *dev) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 ctrl[2]; int need_clear = 0, err; /* Initialize reserved registers as specified in datasheet */ err = regmap_write(rx8010->regs, RX8010_RESV17, 0xD8); if (err) return err; err = regmap_write(rx8010->regs, RX8010_RESV30, 0x00); if (err) return err; err = regmap_write(rx8010->regs, RX8010_RESV31, 0x08); if (err) return err; err = regmap_write(rx8010->regs, RX8010_IRQ, 0x00); if (err) return err; err = regmap_bulk_read(rx8010->regs, RX8010_FLAG, ctrl, 2); if (err) return err; if (ctrl[0] & RX8010_FLAG_VLF) dev_warn(dev, "Frequency stop was detected\n"); if (ctrl[0] & RX8010_FLAG_AF) { dev_warn(dev, "Alarm was detected\n"); need_clear = 1; } if (ctrl[0] & RX8010_FLAG_TF) need_clear = 1; if (ctrl[0] & RX8010_FLAG_UF) need_clear = 1; if (need_clear) { ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); err = regmap_write(rx8010->regs, RX8010_FLAG, ctrl[0]); if (err) return err; } rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST); return 0; } static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 alarmvals[3]; int flagreg, err; err = regmap_bulk_read(rx8010->regs, RX8010_ALMIN, alarmvals, 3); if (err) return err; err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; t->time.tm_sec = 0; t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); if (!(alarmvals[2] & RX8010_ALARM_AE)) t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f); t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE); t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled; return 0; } static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); u8 alarmvals[3]; int err; if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) { rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE); err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); if (err) return err; alarmvals[0] = bin2bcd(t->time.tm_min); alarmvals[1] = bin2bcd(t->time.tm_hour); alarmvals[2] = bin2bcd(t->time.tm_mday); err = regmap_bulk_write(rx8010->regs, RX8010_ALMIN, alarmvals, 2); if (err) return err; err = regmap_clear_bits(rx8010->regs, RX8010_EXT, RX8010_EXT_WADA); if (err) return err; if (alarmvals[2] == 0) alarmvals[2] |= RX8010_ALARM_AE; err = regmap_write(rx8010->regs, RX8010_ALWDAY, alarmvals[2]); if (err) return err; if (t->enabled) { if (rx8010->rtc->uie_rtctimer.enabled) rx8010->ctrlreg |= RX8010_CTRL_UIE; if (rx8010->rtc->aie_timer.enabled) rx8010->ctrlreg |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } return 0; } static int rx8010_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); int err; u8 ctrl; ctrl = rx8010->ctrlreg; if (enabled) { if (rx8010->rtc->uie_rtctimer.enabled) ctrl |= RX8010_CTRL_UIE; if (rx8010->rtc->aie_timer.enabled) ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); } else { if (!rx8010->rtc->uie_rtctimer.enabled) ctrl &= ~RX8010_CTRL_UIE; if (!rx8010->rtc->aie_timer.enabled) ctrl &= ~RX8010_CTRL_AIE; } err = regmap_clear_bits(rx8010->regs, RX8010_FLAG, RX8010_FLAG_AF); if (err) return err; if (ctrl != rx8010->ctrlreg) { rx8010->ctrlreg = ctrl; err = regmap_write(rx8010->regs, RX8010_CTRL, rx8010->ctrlreg); if (err) return err; } return 0; } static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct rx8010_data *rx8010 = dev_get_drvdata(dev); int tmp, flagreg, err; switch (cmd) { case RTC_VL_READ: err = regmap_read(rx8010->regs, RX8010_FLAG, &flagreg); if (err) return err; tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0; return put_user(tmp, (unsigned int __user *)arg); default: return -ENOIOCTLCMD; } } static const struct rtc_class_ops rx8010_rtc_ops = { .read_time = rx8010_get_time, .set_time = rx8010_set_time, .ioctl = rx8010_ioctl, .read_alarm = rx8010_read_alarm, .set_alarm = rx8010_set_alarm, .alarm_irq_enable = rx8010_alarm_irq_enable, }; static const struct regmap_config rx8010_regmap_config = { .name = "rx8010-rtc", .reg_bits = 8, .val_bits = 8, }; static int rx8010_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct rx8010_data *rx8010; int err = 0; rx8010 = devm_kzalloc(dev, sizeof(*rx8010), GFP_KERNEL); if (!rx8010) return -ENOMEM; i2c_set_clientdata(client, rx8010); rx8010->regs = devm_regmap_init_i2c(client, &rx8010_regmap_config); if (IS_ERR(rx8010->regs)) return PTR_ERR(rx8010->regs); err = rx8010_init(dev); if (err) return err; rx8010->rtc = devm_rtc_allocate_device(dev); if (IS_ERR(rx8010->rtc)) return PTR_ERR(rx8010->rtc); if (client->irq > 0) { unsigned long irqflags = IRQF_TRIGGER_LOW; if (dev_fwnode(&client->dev)) irqflags = 0; err = devm_request_threaded_irq(dev, client->irq, NULL, rx8010_irq_1_handler, irqflags | IRQF_ONESHOT, "rx8010", client); if (err) { dev_err(dev, "unable to request IRQ\n"); return err; } } else { clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features); } rx8010->rtc->ops = &rx8010_rtc_ops; rx8010->rtc->max_user_freq = 1; rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099; return devm_rtc_register_device(rx8010->rtc); } static struct i2c_driver rx8010_driver = { .driver = { .name = "rtc-rx8010", .of_match_table = of_match_ptr(rx8010_of_match), }, .probe_new = rx8010_probe, .id_table = rx8010_id, }; module_i2c_driver(rx8010_driver); MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>"); MODULE_DESCRIPTION("Epson RX8010SJ RTC driver"); MODULE_LICENSE("GPL v2");
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