593 lines
14 KiB
C
593 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for Epson's RTC module RX-8025 SA/NB
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*
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* Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
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*
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* Copyright (C) 2005 by Digi International Inc.
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* All rights reserved.
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*
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* Modified by fengjh at rising.com.cn
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* <lm-sensors@lm-sensors.org>
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* 2006.11
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*
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* Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
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* Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
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* Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
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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/kstrtox.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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/* Register definitions */
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#define RX8025_REG_SEC 0x00
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#define RX8025_REG_MIN 0x01
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#define RX8025_REG_HOUR 0x02
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#define RX8025_REG_WDAY 0x03
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#define RX8025_REG_MDAY 0x04
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#define RX8025_REG_MONTH 0x05
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#define RX8025_REG_YEAR 0x06
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#define RX8025_REG_DIGOFF 0x07
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#define RX8025_REG_ALWMIN 0x08
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#define RX8025_REG_ALWHOUR 0x09
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#define RX8025_REG_ALWWDAY 0x0a
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#define RX8025_REG_ALDMIN 0x0b
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#define RX8025_REG_ALDHOUR 0x0c
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/* 0x0d is reserved */
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#define RX8025_REG_CTRL1 0x0e
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#define RX8025_REG_CTRL2 0x0f
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#define RX8025_BIT_CTRL1_CT (7 << 0)
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/* 1 Hz periodic level irq */
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#define RX8025_BIT_CTRL1_CT_1HZ 4
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#define RX8025_BIT_CTRL1_TEST BIT(3)
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#define RX8025_BIT_CTRL1_1224 BIT(5)
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#define RX8025_BIT_CTRL1_DALE BIT(6)
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#define RX8025_BIT_CTRL1_WALE BIT(7)
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#define RX8025_BIT_CTRL2_DAFG BIT(0)
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#define RX8025_BIT_CTRL2_WAFG BIT(1)
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#define RX8025_BIT_CTRL2_CTFG BIT(2)
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#define RX8025_BIT_CTRL2_PON BIT(4)
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#define RX8025_BIT_CTRL2_XST BIT(5)
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#define RX8025_BIT_CTRL2_VDET BIT(6)
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#define RX8035_BIT_HOUR_1224 BIT(7)
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/* Clock precision adjustment */
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#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */
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#define RX8025_ADJ_DATA_MAX 62
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#define RX8025_ADJ_DATA_MIN -62
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enum rx_model {
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model_rx_unknown,
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model_rx_8025,
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model_rx_8035,
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model_last
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};
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static const struct i2c_device_id rx8025_id[] = {
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{ "rx8025", model_rx_8025 },
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{ "rx8035", model_rx_8035 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rx8025_id);
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struct rx8025_data {
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struct rtc_device *rtc;
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enum rx_model model;
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u8 ctrl1;
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int is_24;
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};
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static s32 rx8025_read_reg(const struct i2c_client *client, u8 number)
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{
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return i2c_smbus_read_byte_data(client, number << 4);
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}
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static int rx8025_read_regs(const struct i2c_client *client,
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u8 number, u8 length, u8 *values)
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{
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int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length,
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values);
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if (ret != length)
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return ret < 0 ? ret : -EIO;
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return 0;
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}
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static s32 rx8025_write_reg(const struct i2c_client *client, u8 number,
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u8 value)
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{
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return i2c_smbus_write_byte_data(client, number << 4, value);
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}
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static s32 rx8025_write_regs(const struct i2c_client *client,
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u8 number, u8 length, const u8 *values)
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{
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return i2c_smbus_write_i2c_block_data(client, number << 4,
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length, values);
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}
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static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
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{
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int xstp = ctrl2 & RX8025_BIT_CTRL2_XST;
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/* XSTP bit has different polarity on RX-8025 vs RX-8035.
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* RX-8025: 0 == oscillator stopped
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* RX-8035: 1 == oscillator stopped
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*/
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if (model == model_rx_8025)
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xstp = !xstp;
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return xstp;
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}
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static int rx8025_check_validity(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8025_data *drvdata = dev_get_drvdata(dev);
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int ctrl2;
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int xstp;
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ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
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if (ctrl2 < 0)
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return ctrl2;
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if (ctrl2 & RX8025_BIT_CTRL2_VDET)
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dev_warn(dev, "power voltage drop detected\n");
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if (ctrl2 & RX8025_BIT_CTRL2_PON) {
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dev_warn(dev, "power-on reset detected, date is invalid\n");
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return -EINVAL;
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}
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xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2);
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if (xstp) {
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dev_warn(dev, "crystal stopped, date is invalid\n");
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return -EINVAL;
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}
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return 0;
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}
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static int rx8025_reset_validity(struct i2c_client *client)
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{
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struct rx8025_data *drvdata = i2c_get_clientdata(client);
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int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
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if (ctrl2 < 0)
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return ctrl2;
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ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
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if (drvdata->model == model_rx_8025)
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ctrl2 |= RX8025_BIT_CTRL2_XST;
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else
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ctrl2 &= ~(RX8025_BIT_CTRL2_XST);
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return rx8025_write_reg(client, RX8025_REG_CTRL2,
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ctrl2);
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}
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static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
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{
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struct i2c_client *client = dev_id;
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struct rx8025_data *rx8025 = i2c_get_clientdata(client);
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int status, xstp;
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rtc_lock(rx8025->rtc);
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status = rx8025_read_reg(client, RX8025_REG_CTRL2);
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if (status < 0)
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goto out;
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xstp = rx8025_is_osc_stopped(rx8025->model, status);
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if (xstp)
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dev_warn(&client->dev, "Oscillation stop was detected,"
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"you may have to readjust the clock\n");
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if (status & RX8025_BIT_CTRL2_CTFG) {
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/* periodic */
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status &= ~RX8025_BIT_CTRL2_CTFG;
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rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
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}
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if (status & RX8025_BIT_CTRL2_DAFG) {
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/* alarm */
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status &= RX8025_BIT_CTRL2_DAFG;
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if (rx8025_write_reg(client, RX8025_REG_CTRL1,
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rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
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goto out;
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rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
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}
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out:
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rtc_unlock(rx8025->rtc);
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return IRQ_HANDLED;
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}
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static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8025_data *rx8025 = dev_get_drvdata(dev);
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u8 date[7];
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int err;
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err = rx8025_check_validity(dev);
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if (err)
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return err;
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err = rx8025_read_regs(client, RX8025_REG_SEC, 7, date);
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if (err)
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return err;
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dev_dbg(dev, "%s: read %7ph\n", __func__, date);
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dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
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dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
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if (rx8025->is_24)
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dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
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else
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dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
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+ (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
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dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
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dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
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dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
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dev_dbg(dev, "%s: date %ptRr\n", __func__, dt);
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return 0;
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}
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static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8025_data *rx8025 = dev_get_drvdata(dev);
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u8 date[7];
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int ret;
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/*
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* Here the read-only bits are written as "0". I'm not sure if that
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* is sound.
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*/
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date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
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date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
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if (rx8025->is_24)
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date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
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else
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date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
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| bin2bcd((dt->tm_hour + 11) % 12 + 1);
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date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
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date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
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date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
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date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
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dev_dbg(dev, "%s: write %7ph\n", __func__, date);
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ret = rx8025_write_regs(client, RX8025_REG_SEC, 7, date);
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if (ret < 0)
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return ret;
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return rx8025_reset_validity(client);
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}
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static int rx8025_init_client(struct i2c_client *client)
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{
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struct rx8025_data *rx8025 = i2c_get_clientdata(client);
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u8 ctrl[2], ctrl2;
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int need_clear = 0;
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int hour_reg;
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int err;
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err = rx8025_read_regs(client, RX8025_REG_CTRL1, 2, ctrl);
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if (err)
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goto out;
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/* Keep test bit zero ! */
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rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
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if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
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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[1] & RX8025_BIT_CTRL2_CTFG)
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need_clear = 1;
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if (need_clear) {
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ctrl2 = ctrl[1];
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ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
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RX8025_BIT_CTRL2_DAFG);
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err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
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}
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if (rx8025->model == model_rx_8035) {
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/* In RX-8035, 12/24 flag is in the hour register */
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hour_reg = rx8025_read_reg(client, RX8025_REG_HOUR);
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if (hour_reg < 0)
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return hour_reg;
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rx8025->is_24 = (hour_reg & RX8035_BIT_HOUR_1224);
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} else {
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rx8025->is_24 = (ctrl[1] & RX8025_BIT_CTRL1_1224);
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}
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out:
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return err;
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}
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/* Alarm support */
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static int rx8025_read_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 rx8025_data *rx8025 = dev_get_drvdata(dev);
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u8 ald[2];
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int ctrl2, err;
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err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
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if (err)
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return err;
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ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
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if (ctrl2 < 0)
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return ctrl2;
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dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
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__func__, ald[0], ald[1], ctrl2);
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/* Hardware alarms precision is 1 minute! */
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t->time.tm_sec = 0;
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t->time.tm_min = bcd2bin(ald[0] & 0x7f);
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if (rx8025->is_24)
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t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
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else
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t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
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+ (ald[1] & 0x20 ? 12 : 0);
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dev_dbg(dev, "%s: date: %ptRr\n", __func__, &t->time);
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t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
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t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
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return err;
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}
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static int rx8025_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 rx8025_data *rx8025 = dev_get_drvdata(dev);
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u8 ald[2];
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int err;
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ald[0] = bin2bcd(t->time.tm_min);
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if (rx8025->is_24)
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ald[1] = bin2bcd(t->time.tm_hour);
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else
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ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
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| bin2bcd((t->time.tm_hour + 11) % 12 + 1);
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dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);
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if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
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rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
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err = rx8025_write_reg(client, RX8025_REG_CTRL1,
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rx8025->ctrl1);
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if (err)
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return err;
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}
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err = rx8025_write_regs(client, RX8025_REG_ALDMIN, 2, ald);
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if (err)
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return err;
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if (t->enabled) {
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rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
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err = rx8025_write_reg(client, RX8025_REG_CTRL1,
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rx8025->ctrl1);
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if (err)
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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 rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct rx8025_data *rx8025 = dev_get_drvdata(dev);
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u8 ctrl1;
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int err;
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ctrl1 = rx8025->ctrl1;
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if (enabled)
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ctrl1 |= RX8025_BIT_CTRL1_DALE;
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else
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ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
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if (ctrl1 != rx8025->ctrl1) {
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rx8025->ctrl1 = ctrl1;
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err = rx8025_write_reg(client, RX8025_REG_CTRL1,
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rx8025->ctrl1);
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if (err)
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return err;
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}
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return 0;
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}
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/*
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* According to the RX8025 SA/NB application manual the frequency and
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* temperature characteristics can be approximated using the following
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* equation:
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*
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* df = a * (ut - t)**2
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*
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* df: Frequency deviation in any temperature
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* a : Coefficient = (-35 +-5) * 10**-9
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* ut: Ultimate temperature in degree = +25 +-5 degree
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* t : Any temperature in degree
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*/
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static int rx8025_read_offset(struct device *dev, long *offset)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int digoff;
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digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF);
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if (digoff < 0)
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return digoff;
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*offset = digoff >= 64 ? digoff - 128 : digoff;
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if (*offset > 0)
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(*offset)--;
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*offset *= RX8025_ADJ_RESOLUTION;
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return 0;
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}
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static int rx8025_set_offset(struct device *dev, long offset)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 digoff;
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offset /= RX8025_ADJ_RESOLUTION;
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if (offset > RX8025_ADJ_DATA_MAX)
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offset = RX8025_ADJ_DATA_MAX;
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else if (offset < RX8025_ADJ_DATA_MIN)
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offset = RX8025_ADJ_DATA_MIN;
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else if (offset > 0)
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offset++;
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else if (offset < 0)
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offset += 128;
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digoff = offset;
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return rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
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}
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static const struct rtc_class_ops rx8025_rtc_ops = {
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.read_time = rx8025_get_time,
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.set_time = rx8025_set_time,
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.read_alarm = rx8025_read_alarm,
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.set_alarm = rx8025_set_alarm,
|
|
.alarm_irq_enable = rx8025_alarm_irq_enable,
|
|
.read_offset = rx8025_read_offset,
|
|
.set_offset = rx8025_set_offset,
|
|
};
|
|
|
|
static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
long adj;
|
|
int err;
|
|
|
|
dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n");
|
|
err = rx8025_read_offset(dev, &adj);
|
|
if (err)
|
|
return err;
|
|
|
|
return sprintf(buf, "%ld\n", -adj);
|
|
}
|
|
|
|
static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
long adj;
|
|
int err;
|
|
|
|
dev_warn_once(dev, "clock_adjust_ppb is deprecated, use offset\n");
|
|
if (kstrtol(buf, 10, &adj) != 0)
|
|
return -EINVAL;
|
|
|
|
err = rx8025_set_offset(dev, -adj);
|
|
|
|
return err ? err : count;
|
|
}
|
|
|
|
static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
|
|
rx8025_sysfs_show_clock_adjust,
|
|
rx8025_sysfs_store_clock_adjust);
|
|
|
|
static struct attribute *rx8025_attrs[] = {
|
|
&dev_attr_clock_adjust_ppb.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group rx8025_attr_group = {
|
|
.attrs = rx8025_attrs,
|
|
};
|
|
|
|
static int rx8025_probe(struct i2c_client *client)
|
|
{
|
|
const struct i2c_device_id *id = i2c_match_id(rx8025_id, client);
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
struct rx8025_data *rx8025;
|
|
int err = 0;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
|
|
| I2C_FUNC_SMBUS_I2C_BLOCK)) {
|
|
dev_err(&adapter->dev,
|
|
"doesn't support required functionality\n");
|
|
return -EIO;
|
|
}
|
|
|
|
rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL);
|
|
if (!rx8025)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, rx8025);
|
|
|
|
if (id)
|
|
rx8025->model = id->driver_data;
|
|
|
|
err = rx8025_init_client(client);
|
|
if (err)
|
|
return err;
|
|
|
|
rx8025->rtc = devm_rtc_allocate_device(&client->dev);
|
|
if (IS_ERR(rx8025->rtc))
|
|
return PTR_ERR(rx8025->rtc);
|
|
|
|
rx8025->rtc->ops = &rx8025_rtc_ops;
|
|
rx8025->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
|
|
rx8025->rtc->range_max = RTC_TIMESTAMP_END_2099;
|
|
|
|
if (client->irq > 0) {
|
|
dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
|
|
err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
|
|
rx8025_handle_irq,
|
|
IRQF_ONESHOT,
|
|
"rx8025", client);
|
|
if (err)
|
|
clear_bit(RTC_FEATURE_ALARM, rx8025->rtc->features);
|
|
}
|
|
|
|
rx8025->rtc->max_user_freq = 1;
|
|
|
|
set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rx8025->rtc->features);
|
|
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rx8025->rtc->features);
|
|
|
|
err = rtc_add_group(rx8025->rtc, &rx8025_attr_group);
|
|
if (err)
|
|
return err;
|
|
|
|
return devm_rtc_register_device(rx8025->rtc);
|
|
}
|
|
|
|
static struct i2c_driver rx8025_driver = {
|
|
.driver = {
|
|
.name = "rtc-rx8025",
|
|
},
|
|
.probe_new = rx8025_probe,
|
|
.id_table = rx8025_id,
|
|
};
|
|
|
|
module_i2c_driver(rx8025_driver);
|
|
|
|
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
|
|
MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
|
|
MODULE_LICENSE("GPL");
|