502 lines
12 KiB
C
502 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the Epson RTC module RX-8010 SJ
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*
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* Copyright(C) Timesys Corporation 2015
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* Copyright(C) General Electric Company 2015
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*/
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#include <linux/bcd.h>
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#include <linux/bitops.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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#define RX8010_SEC 0x10
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#define RX8010_MIN 0x11
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#define RX8010_HOUR 0x12
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#define RX8010_WDAY 0x13
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#define RX8010_MDAY 0x14
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#define RX8010_MONTH 0x15
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#define RX8010_YEAR 0x16
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#define RX8010_RESV17 0x17
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#define RX8010_ALMIN 0x18
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#define RX8010_ALHOUR 0x19
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#define RX8010_ALWDAY 0x1A
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#define RX8010_TCOUNT0 0x1B
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#define RX8010_TCOUNT1 0x1C
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#define RX8010_EXT 0x1D
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#define RX8010_FLAG 0x1E
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#define RX8010_CTRL 0x1F
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/* 0x20 to 0x2F are user registers */
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#define RX8010_RESV30 0x30
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#define RX8010_RESV31 0x31
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#define RX8010_IRQ 0x32
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#define RX8010_EXT_WADA BIT(3)
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#define RX8010_FLAG_VLF BIT(1)
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#define RX8010_FLAG_AF BIT(3)
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#define RX8010_FLAG_TF BIT(4)
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#define RX8010_FLAG_UF BIT(5)
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#define RX8010_CTRL_AIE BIT(3)
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#define RX8010_CTRL_UIE BIT(5)
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#define RX8010_CTRL_STOP BIT(6)
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#define RX8010_CTRL_TEST BIT(7)
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#define RX8010_ALARM_AE BIT(7)
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static const struct i2c_device_id rx8010_id[] = {
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{ "rx8010", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rx8010_id);
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static const struct of_device_id rx8010_of_match[] = {
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{ .compatible = "epson,rx8010" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rx8010_of_match);
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struct rx8010_data {
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struct i2c_client *client;
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struct rtc_device *rtc;
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u8 ctrlreg;
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};
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static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
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{
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struct i2c_client *client = dev_id;
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struct rx8010_data *rx8010 = i2c_get_clientdata(client);
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int flagreg;
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mutex_lock(&rx8010->rtc->ops_lock);
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flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
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if (flagreg <= 0) {
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mutex_unlock(&rx8010->rtc->ops_lock);
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return IRQ_NONE;
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}
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if (flagreg & RX8010_FLAG_VLF)
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dev_warn(&client->dev, "Frequency stop detected\n");
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if (flagreg & RX8010_FLAG_TF) {
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flagreg &= ~RX8010_FLAG_TF;
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rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
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}
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if (flagreg & RX8010_FLAG_AF) {
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flagreg &= ~RX8010_FLAG_AF;
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rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
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}
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if (flagreg & RX8010_FLAG_UF) {
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flagreg &= ~RX8010_FLAG_UF;
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rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
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}
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i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
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mutex_unlock(&rx8010->rtc->ops_lock);
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return IRQ_HANDLED;
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}
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static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 date[7];
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int flagreg;
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int err;
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flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
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if (flagreg < 0)
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return flagreg;
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if (flagreg & RX8010_FLAG_VLF) {
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dev_warn(dev, "Frequency stop detected\n");
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return -EINVAL;
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}
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err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
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7, date);
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if (err != 7)
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return err < 0 ? err : -EIO;
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dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
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dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
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dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
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dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
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dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
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dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
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dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
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return 0;
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}
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static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 date[7];
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int ctrl, flagreg;
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int ret;
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if ((dt->tm_year < 100) || (dt->tm_year > 199))
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return -EINVAL;
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/* set STOP bit before changing clock/calendar */
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ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
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if (ctrl < 0)
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return ctrl;
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rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP;
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ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
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rx8010->ctrlreg);
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if (ret < 0)
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return ret;
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date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
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date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
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date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
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date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
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date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
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date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
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date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
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ret = i2c_smbus_write_i2c_block_data(rx8010->client,
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RX8010_SEC, 7, date);
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if (ret < 0)
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return ret;
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/* clear STOP bit after changing clock/calendar */
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ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
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if (ctrl < 0)
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return ctrl;
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rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
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ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
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rx8010->ctrlreg);
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if (ret < 0)
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return ret;
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flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
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if (flagreg < 0) {
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return flagreg;
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}
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if (flagreg & RX8010_FLAG_VLF)
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ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
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flagreg & ~RX8010_FLAG_VLF);
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return 0;
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}
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static int rx8010_init_client(struct i2c_client *client)
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{
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struct rx8010_data *rx8010 = i2c_get_clientdata(client);
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u8 ctrl[2];
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int need_clear = 0, err = 0;
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/* Initialize reserved registers as specified in datasheet */
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err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
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if (err < 0)
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return err;
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err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
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if (err < 0)
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return err;
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err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
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2, ctrl);
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if (err != 2)
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return err < 0 ? err : -EIO;
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if (ctrl[0] & RX8010_FLAG_VLF)
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dev_warn(&client->dev, "Frequency stop was detected\n");
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if (ctrl[0] & RX8010_FLAG_AF) {
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dev_warn(&client->dev, "Alarm was detected\n");
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need_clear = 1;
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}
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if (ctrl[0] & RX8010_FLAG_TF)
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need_clear = 1;
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if (ctrl[0] & RX8010_FLAG_UF)
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need_clear = 1;
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if (need_clear) {
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ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
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err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
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if (err < 0)
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return err;
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}
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rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
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return 0;
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}
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static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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struct i2c_client *client = rx8010->client;
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u8 alarmvals[3];
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int flagreg;
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int err;
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err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
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if (err != 3)
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return err < 0 ? err : -EIO;
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flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
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if (flagreg < 0)
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return flagreg;
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t->time.tm_sec = 0;
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t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
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t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
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if (!(alarmvals[2] & RX8010_ALARM_AE))
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t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
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t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
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t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
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return 0;
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}
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static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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u8 alarmvals[3];
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int extreg, flagreg;
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int err;
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flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
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if (flagreg < 0) {
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return flagreg;
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}
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if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
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rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
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rx8010->ctrlreg);
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if (err < 0) {
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return err;
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}
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}
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flagreg &= ~RX8010_FLAG_AF;
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
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if (err < 0)
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return err;
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alarmvals[0] = bin2bcd(t->time.tm_min);
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alarmvals[1] = bin2bcd(t->time.tm_hour);
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alarmvals[2] = bin2bcd(t->time.tm_mday);
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err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
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2, alarmvals);
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if (err < 0)
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return err;
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extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
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if (extreg < 0)
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return extreg;
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extreg |= RX8010_EXT_WADA;
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
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if (err < 0)
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return err;
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if (alarmvals[2] == 0)
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alarmvals[2] |= RX8010_ALARM_AE;
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
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alarmvals[2]);
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if (err < 0)
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return err;
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if (t->enabled) {
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if (rx8010->rtc->uie_rtctimer.enabled)
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rx8010->ctrlreg |= RX8010_CTRL_UIE;
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if (rx8010->rtc->aie_timer.enabled)
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rx8010->ctrlreg |=
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(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
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rx8010->ctrlreg);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int rx8010_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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int flagreg;
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u8 ctrl;
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int err;
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ctrl = rx8010->ctrlreg;
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if (enabled) {
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if (rx8010->rtc->uie_rtctimer.enabled)
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ctrl |= RX8010_CTRL_UIE;
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if (rx8010->rtc->aie_timer.enabled)
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ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
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} else {
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if (!rx8010->rtc->uie_rtctimer.enabled)
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ctrl &= ~RX8010_CTRL_UIE;
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if (!rx8010->rtc->aie_timer.enabled)
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ctrl &= ~RX8010_CTRL_AIE;
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}
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flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
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if (flagreg < 0)
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return flagreg;
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flagreg &= ~RX8010_FLAG_AF;
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
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if (err < 0)
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return err;
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if (ctrl != rx8010->ctrlreg) {
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rx8010->ctrlreg = ctrl;
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err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
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rx8010->ctrlreg);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8010_data *rx8010 = dev_get_drvdata(dev);
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int ret, tmp;
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int flagreg;
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switch (cmd) {
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case RTC_VL_READ:
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flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
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if (flagreg < 0)
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return flagreg;
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tmp = !!(flagreg & RX8010_FLAG_VLF);
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if (copy_to_user((void __user *)arg, &tmp, sizeof(int)))
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return -EFAULT;
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return 0;
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case RTC_VL_CLR:
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flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
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if (flagreg < 0) {
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return flagreg;
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}
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flagreg &= ~RX8010_FLAG_VLF;
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ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
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if (ret < 0)
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return ret;
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return 0;
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default:
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return -ENOIOCTLCMD;
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}
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}
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static struct rtc_class_ops rx8010_rtc_ops = {
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.read_time = rx8010_get_time,
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.set_time = rx8010_set_time,
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.ioctl = rx8010_ioctl,
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};
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static int rx8010_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct rx8010_data *rx8010;
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int err = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_I2C_BLOCK)) {
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dev_err(&adapter->dev, "doesn't support required functionality\n");
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return -EIO;
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}
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rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
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GFP_KERNEL);
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if (!rx8010)
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return -ENOMEM;
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rx8010->client = client;
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i2c_set_clientdata(client, rx8010);
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err = rx8010_init_client(client);
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if (err)
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return err;
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if (client->irq > 0) {
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dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
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err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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rx8010_irq_1_handler,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"rx8010", client);
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if (err) {
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dev_err(&client->dev, "unable to request IRQ\n");
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client->irq = 0;
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} else {
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rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
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rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
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rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
|
|
}
|
|
}
|
|
|
|
rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
|
|
&rx8010_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(rx8010->rtc)) {
|
|
dev_err(&client->dev, "unable to register the class device\n");
|
|
return PTR_ERR(rx8010->rtc);
|
|
}
|
|
|
|
rx8010->rtc->max_user_freq = 1;
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct i2c_driver rx8010_driver = {
|
|
.driver = {
|
|
.name = "rtc-rx8010",
|
|
.of_match_table = of_match_ptr(rx8010_of_match),
|
|
},
|
|
.probe = 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");
|