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![Kevin P. Fleming](/assets/img/avatar_default.png)
Writing one of key two values into the configuration key register is a common operation, so a utility function has been added to provide consistent behavior and eliminate code duplication. Signed-off-by: Kevin P. Fleming <kevin+linux@km6g.us> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> To: linux-rtc@vger.kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20200615105113.57770-2-kevin+linux@km6g.us
926 lines
22 KiB
C
926 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* A driver for the I2C members of the Abracon AB x8xx RTC family,
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* and compatible: AB 1805 and AB 0805
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*
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* Copyright 2014-2015 Macq S.A.
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*
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* Author: Philippe De Muyter <phdm@macqel.be>
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* Author: Alexandre Belloni <alexandre.belloni@bootlin.com>
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*
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*/
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#include <linux/bcd.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/rtc.h>
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#include <linux/watchdog.h>
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#define ABX8XX_REG_HTH 0x00
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#define ABX8XX_REG_SC 0x01
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#define ABX8XX_REG_MN 0x02
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#define ABX8XX_REG_HR 0x03
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#define ABX8XX_REG_DA 0x04
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#define ABX8XX_REG_MO 0x05
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#define ABX8XX_REG_YR 0x06
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#define ABX8XX_REG_WD 0x07
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#define ABX8XX_REG_AHTH 0x08
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#define ABX8XX_REG_ASC 0x09
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#define ABX8XX_REG_AMN 0x0a
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#define ABX8XX_REG_AHR 0x0b
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#define ABX8XX_REG_ADA 0x0c
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#define ABX8XX_REG_AMO 0x0d
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#define ABX8XX_REG_AWD 0x0e
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#define ABX8XX_REG_STATUS 0x0f
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#define ABX8XX_STATUS_AF BIT(2)
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#define ABX8XX_STATUS_BLF BIT(4)
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#define ABX8XX_STATUS_WDT BIT(6)
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#define ABX8XX_REG_CTRL1 0x10
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#define ABX8XX_CTRL_WRITE BIT(0)
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#define ABX8XX_CTRL_ARST BIT(2)
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#define ABX8XX_CTRL_12_24 BIT(6)
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#define ABX8XX_REG_CTRL2 0x11
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#define ABX8XX_CTRL2_RSVD BIT(5)
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#define ABX8XX_REG_IRQ 0x12
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#define ABX8XX_IRQ_AIE BIT(2)
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#define ABX8XX_IRQ_IM_1_4 (0x3 << 5)
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#define ABX8XX_REG_CD_TIMER_CTL 0x18
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#define ABX8XX_REG_OSC 0x1c
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#define ABX8XX_OSC_FOS BIT(3)
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#define ABX8XX_OSC_BOS BIT(4)
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#define ABX8XX_OSC_ACAL_512 BIT(5)
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#define ABX8XX_OSC_ACAL_1024 BIT(6)
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#define ABX8XX_OSC_OSEL BIT(7)
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#define ABX8XX_REG_OSS 0x1d
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#define ABX8XX_OSS_OF BIT(1)
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#define ABX8XX_OSS_OMODE BIT(4)
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#define ABX8XX_REG_WDT 0x1b
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#define ABX8XX_WDT_WDS BIT(7)
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#define ABX8XX_WDT_BMB_MASK 0x7c
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#define ABX8XX_WDT_BMB_SHIFT 2
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#define ABX8XX_WDT_MAX_TIME (ABX8XX_WDT_BMB_MASK >> ABX8XX_WDT_BMB_SHIFT)
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#define ABX8XX_WDT_WRB_MASK 0x03
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#define ABX8XX_WDT_WRB_1HZ 0x02
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#define ABX8XX_REG_CFG_KEY 0x1f
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#define ABX8XX_CFG_KEY_OSC 0xa1
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#define ABX8XX_CFG_KEY_MISC 0x9d
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#define ABX8XX_REG_ID0 0x28
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#define ABX8XX_REG_OUT_CTRL 0x30
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#define ABX8XX_OUT_CTRL_EXDS BIT(4)
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#define ABX8XX_REG_TRICKLE 0x20
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#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0
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#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8
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#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4
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static u8 trickle_resistors[] = {0, 3, 6, 11};
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enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
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AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X};
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struct abx80x_cap {
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u16 pn;
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bool has_tc;
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bool has_wdog;
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};
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static struct abx80x_cap abx80x_caps[] = {
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[AB0801] = {.pn = 0x0801},
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[AB0803] = {.pn = 0x0803},
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[AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true},
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[AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true},
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[AB1801] = {.pn = 0x1801},
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[AB1803] = {.pn = 0x1803},
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[AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true},
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[AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
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[RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
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[ABX80X] = {.pn = 0}
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};
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struct abx80x_priv {
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struct rtc_device *rtc;
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struct i2c_client *client;
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struct watchdog_device wdog;
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};
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static int abx80x_write_config_key(struct i2c_client *client, u8 key)
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{
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if (i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, key) < 0) {
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dev_err(&client->dev, "Unable to write configuration key\n");
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return -EIO;
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}
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return 0;
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}
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static int abx80x_is_rc_mode(struct i2c_client *client)
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{
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int flags = 0;
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0) {
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dev_err(&client->dev,
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"Failed to read autocalibration attribute\n");
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return flags;
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}
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return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
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}
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static int abx80x_enable_trickle_charger(struct i2c_client *client,
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u8 trickle_cfg)
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{
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int err;
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/*
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* Write the configuration key register to enable access to the Trickle
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* register
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*/
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if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
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return -EIO;
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err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
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ABX8XX_TRICKLE_CHARGE_ENABLE |
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trickle_cfg);
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if (err < 0) {
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dev_err(&client->dev, "Unable to write trickle register\n");
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return -EIO;
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}
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return 0;
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}
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static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[8];
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int err, flags, rc_mode = 0;
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/* Read the Oscillator Failure only in XT mode */
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rc_mode = abx80x_is_rc_mode(client);
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if (rc_mode < 0)
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return rc_mode;
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if (!rc_mode) {
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0)
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return flags;
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if (flags & ABX8XX_OSS_OF) {
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dev_err(dev, "Oscillator failure, data is invalid.\n");
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return -EINVAL;
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}
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}
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err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
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sizeof(buf), buf);
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if (err < 0) {
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dev_err(&client->dev, "Unable to read date\n");
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return -EIO;
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}
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tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
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tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
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tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
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tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
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tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
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tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
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tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
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return 0;
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}
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static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned char buf[8];
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int err, flags;
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if (tm->tm_year < 100)
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return -EINVAL;
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buf[ABX8XX_REG_HTH] = 0;
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buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
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buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
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buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
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buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
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buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
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buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
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buf[ABX8XX_REG_WD] = tm->tm_wday;
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err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
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sizeof(buf), buf);
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if (err < 0) {
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dev_err(&client->dev, "Unable to write to date registers\n");
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return -EIO;
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}
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/* Clear the OF bit of Oscillator Status Register */
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
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if (flags < 0)
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return flags;
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err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
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flags & ~ABX8XX_OSS_OF);
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if (err < 0) {
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dev_err(&client->dev, "Unable to write oscillator status register\n");
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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 irqreturn_t abx80x_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 abx80x_priv *priv = i2c_get_clientdata(client);
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struct rtc_device *rtc = priv->rtc;
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int status;
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status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
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if (status < 0)
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return IRQ_NONE;
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if (status & ABX8XX_STATUS_AF)
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rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
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/*
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* It is unclear if we'll get an interrupt before the external
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* reset kicks in.
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*/
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if (status & ABX8XX_STATUS_WDT)
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dev_alert(&client->dev, "watchdog timeout interrupt.\n");
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i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
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return IRQ_HANDLED;
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}
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static int abx80x_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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unsigned char buf[7];
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int irq_mask, err;
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if (client->irq <= 0)
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return -EINVAL;
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err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
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sizeof(buf), buf);
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if (err)
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return err;
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irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
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if (irq_mask < 0)
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return irq_mask;
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t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
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t->time.tm_min = bcd2bin(buf[1] & 0x7F);
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t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
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t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
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t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
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t->time.tm_wday = buf[5] & 0x7;
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t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
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t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
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return err;
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}
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static int abx80x_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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u8 alarm[6];
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int err;
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if (client->irq <= 0)
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return -EINVAL;
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alarm[0] = 0x0;
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alarm[1] = bin2bcd(t->time.tm_sec);
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alarm[2] = bin2bcd(t->time.tm_min);
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alarm[3] = bin2bcd(t->time.tm_hour);
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alarm[4] = bin2bcd(t->time.tm_mday);
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alarm[5] = bin2bcd(t->time.tm_mon + 1);
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err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
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sizeof(alarm), alarm);
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if (err < 0) {
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dev_err(&client->dev, "Unable to write alarm registers\n");
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return -EIO;
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}
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if (t->enabled) {
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err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
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(ABX8XX_IRQ_IM_1_4 |
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ABX8XX_IRQ_AIE));
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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 abx80x_rtc_set_autocalibration(struct device *dev,
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int autocalibration)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int retval, flags = 0;
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if ((autocalibration != 0) && (autocalibration != 1024) &&
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(autocalibration != 512)) {
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dev_err(dev, "autocalibration value outside permitted range\n");
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return -EINVAL;
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}
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (autocalibration == 0) {
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flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
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} else if (autocalibration == 1024) {
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/* 1024 autocalibration is 0x10 */
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flags |= ABX8XX_OSC_ACAL_1024;
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flags &= ~(ABX8XX_OSC_ACAL_512);
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} else {
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/* 512 autocalibration is 0x11 */
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flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
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}
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/* Unlock write access to Oscillator Control Register */
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if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
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return -EIO;
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retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
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return retval;
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}
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static int abx80x_rtc_get_autocalibration(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int flags = 0, autocalibration;
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (flags & ABX8XX_OSC_ACAL_512)
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autocalibration = 512;
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else if (flags & ABX8XX_OSC_ACAL_1024)
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autocalibration = 1024;
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else
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autocalibration = 0;
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return autocalibration;
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}
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static ssize_t autocalibration_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int retval;
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unsigned long autocalibration = 0;
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retval = kstrtoul(buf, 10, &autocalibration);
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if (retval < 0) {
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dev_err(dev, "Failed to store RTC autocalibration attribute\n");
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return -EINVAL;
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}
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retval = abx80x_rtc_set_autocalibration(dev->parent, autocalibration);
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return retval ? retval : count;
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}
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static ssize_t autocalibration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int autocalibration = 0;
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autocalibration = abx80x_rtc_get_autocalibration(dev->parent);
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if (autocalibration < 0) {
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dev_err(dev, "Failed to read RTC autocalibration\n");
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sprintf(buf, "0\n");
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return autocalibration;
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}
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return sprintf(buf, "%d\n", autocalibration);
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}
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static DEVICE_ATTR_RW(autocalibration);
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static ssize_t oscillator_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev->parent);
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int retval, flags, rc_mode = 0;
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if (strncmp(buf, "rc", 2) == 0) {
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rc_mode = 1;
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} else if (strncmp(buf, "xtal", 4) == 0) {
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rc_mode = 0;
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} else {
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dev_err(dev, "Oscillator selection value outside permitted ones\n");
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return -EINVAL;
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}
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flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
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if (flags < 0)
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return flags;
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if (rc_mode == 0)
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flags &= ~(ABX8XX_OSC_OSEL);
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|
else
|
|
flags |= (ABX8XX_OSC_OSEL);
|
|
|
|
/* Unlock write access on Oscillator Control register */
|
|
if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_OSC) < 0)
|
|
return -EIO;
|
|
|
|
retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
|
|
if (retval < 0) {
|
|
dev_err(dev, "Failed to write Oscillator Control register\n");
|
|
return retval;
|
|
}
|
|
|
|
return retval ? retval : count;
|
|
}
|
|
|
|
static ssize_t oscillator_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int rc_mode = 0;
|
|
struct i2c_client *client = to_i2c_client(dev->parent);
|
|
|
|
rc_mode = abx80x_is_rc_mode(client);
|
|
|
|
if (rc_mode < 0) {
|
|
dev_err(dev, "Failed to read RTC oscillator selection\n");
|
|
sprintf(buf, "\n");
|
|
return rc_mode;
|
|
}
|
|
|
|
if (rc_mode)
|
|
return sprintf(buf, "rc\n");
|
|
else
|
|
return sprintf(buf, "xtal\n");
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(oscillator);
|
|
|
|
static struct attribute *rtc_calib_attrs[] = {
|
|
&dev_attr_autocalibration.attr,
|
|
&dev_attr_oscillator.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group rtc_calib_attr_group = {
|
|
.attrs = rtc_calib_attrs,
|
|
};
|
|
|
|
static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int err;
|
|
|
|
if (enabled)
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
|
|
(ABX8XX_IRQ_IM_1_4 |
|
|
ABX8XX_IRQ_AIE));
|
|
else
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
|
|
ABX8XX_IRQ_IM_1_4);
|
|
return err;
|
|
}
|
|
|
|
static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int status, tmp;
|
|
|
|
switch (cmd) {
|
|
case RTC_VL_READ:
|
|
status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
tmp = status & ABX8XX_STATUS_BLF ? RTC_VL_BACKUP_LOW : 0;
|
|
|
|
return put_user(tmp, (unsigned int __user *)arg);
|
|
|
|
case RTC_VL_CLR:
|
|
status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
status &= ~ABX8XX_STATUS_BLF;
|
|
|
|
tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
|
|
if (tmp < 0)
|
|
return tmp;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static const struct rtc_class_ops abx80x_rtc_ops = {
|
|
.read_time = abx80x_rtc_read_time,
|
|
.set_time = abx80x_rtc_set_time,
|
|
.read_alarm = abx80x_read_alarm,
|
|
.set_alarm = abx80x_set_alarm,
|
|
.alarm_irq_enable = abx80x_alarm_irq_enable,
|
|
.ioctl = abx80x_ioctl,
|
|
};
|
|
|
|
static int abx80x_dt_trickle_cfg(struct i2c_client *client)
|
|
{
|
|
struct device_node *np = client->dev.of_node;
|
|
const char *diode;
|
|
int trickle_cfg = 0;
|
|
int i, ret;
|
|
u32 tmp;
|
|
|
|
ret = of_property_read_string(np, "abracon,tc-diode", &diode);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!strcmp(diode, "standard")) {
|
|
trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
|
|
} else if (!strcmp(diode, "schottky")) {
|
|
trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
|
|
} else {
|
|
dev_dbg(&client->dev, "Invalid tc-diode value: %s\n", diode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < sizeof(trickle_resistors); i++)
|
|
if (trickle_resistors[i] == tmp)
|
|
break;
|
|
|
|
if (i == sizeof(trickle_resistors)) {
|
|
dev_dbg(&client->dev, "Invalid tc-resistor value: %u\n", tmp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return (trickle_cfg | i);
|
|
}
|
|
|
|
#ifdef CONFIG_WATCHDOG
|
|
|
|
static inline u8 timeout_bits(unsigned int timeout)
|
|
{
|
|
return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) |
|
|
ABX8XX_WDT_WRB_1HZ;
|
|
}
|
|
|
|
static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog,
|
|
unsigned int timeout)
|
|
{
|
|
struct abx80x_priv *priv = watchdog_get_drvdata(wdog);
|
|
u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout);
|
|
|
|
/*
|
|
* Writing any timeout to the WDT register resets the watchdog timer.
|
|
* Writing 0 disables it.
|
|
*/
|
|
return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val);
|
|
}
|
|
|
|
static int abx80x_wdog_set_timeout(struct watchdog_device *wdog,
|
|
unsigned int new_timeout)
|
|
{
|
|
int err = 0;
|
|
|
|
if (watchdog_hw_running(wdog))
|
|
err = __abx80x_wdog_set_timeout(wdog, new_timeout);
|
|
|
|
if (err == 0)
|
|
wdog->timeout = new_timeout;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int abx80x_wdog_ping(struct watchdog_device *wdog)
|
|
{
|
|
return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
|
|
}
|
|
|
|
static int abx80x_wdog_start(struct watchdog_device *wdog)
|
|
{
|
|
return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
|
|
}
|
|
|
|
static int abx80x_wdog_stop(struct watchdog_device *wdog)
|
|
{
|
|
return __abx80x_wdog_set_timeout(wdog, 0);
|
|
}
|
|
|
|
static const struct watchdog_info abx80x_wdog_info = {
|
|
.identity = "abx80x watchdog",
|
|
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static const struct watchdog_ops abx80x_wdog_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = abx80x_wdog_start,
|
|
.stop = abx80x_wdog_stop,
|
|
.ping = abx80x_wdog_ping,
|
|
.set_timeout = abx80x_wdog_set_timeout,
|
|
};
|
|
|
|
static int abx80x_setup_watchdog(struct abx80x_priv *priv)
|
|
{
|
|
priv->wdog.parent = &priv->client->dev;
|
|
priv->wdog.ops = &abx80x_wdog_ops;
|
|
priv->wdog.info = &abx80x_wdog_info;
|
|
priv->wdog.min_timeout = 1;
|
|
priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME;
|
|
priv->wdog.timeout = ABX8XX_WDT_MAX_TIME;
|
|
|
|
watchdog_set_drvdata(&priv->wdog, priv);
|
|
|
|
return devm_watchdog_register_device(&priv->client->dev, &priv->wdog);
|
|
}
|
|
#else
|
|
static int abx80x_setup_watchdog(struct abx80x_priv *priv)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int abx80x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device_node *np = client->dev.of_node;
|
|
struct abx80x_priv *priv;
|
|
int i, data, err, trickle_cfg = -EINVAL;
|
|
char buf[7];
|
|
unsigned int part = id->driver_data;
|
|
unsigned int partnumber;
|
|
unsigned int majrev, minrev;
|
|
unsigned int lot;
|
|
unsigned int wafer;
|
|
unsigned int uid;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
return -ENODEV;
|
|
|
|
err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
|
|
sizeof(buf), buf);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "Unable to read partnumber\n");
|
|
return -EIO;
|
|
}
|
|
|
|
partnumber = (buf[0] << 8) | buf[1];
|
|
majrev = buf[2] >> 3;
|
|
minrev = buf[2] & 0x7;
|
|
lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
|
|
uid = ((buf[4] & 0x7f) << 8) | buf[5];
|
|
wafer = (buf[6] & 0x7c) >> 2;
|
|
dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
|
|
partnumber, majrev, minrev, lot, wafer, uid);
|
|
|
|
data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
|
|
if (data < 0) {
|
|
dev_err(&client->dev, "Unable to read control register\n");
|
|
return -EIO;
|
|
}
|
|
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
|
|
((data & ~(ABX8XX_CTRL_12_24 |
|
|
ABX8XX_CTRL_ARST)) |
|
|
ABX8XX_CTRL_WRITE));
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "Unable to write control register\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/* Configure RV1805 specifics */
|
|
if (part == RV1805) {
|
|
/*
|
|
* Avoid accidentally entering test mode. This can happen
|
|
* on the RV1805 in case the reserved bit 5 in control2
|
|
* register is set. RV-1805-C3 datasheet indicates that
|
|
* the bit should be cleared in section 11h - Control2.
|
|
*/
|
|
data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2);
|
|
if (data < 0) {
|
|
dev_err(&client->dev,
|
|
"Unable to read control2 register\n");
|
|
return -EIO;
|
|
}
|
|
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2,
|
|
data & ~ABX8XX_CTRL2_RSVD);
|
|
if (err < 0) {
|
|
dev_err(&client->dev,
|
|
"Unable to write control2 register\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Avoid extra power leakage. The RV1805 uses smaller
|
|
* 10pin package and the EXTI input is not present.
|
|
* Disable it to avoid leakage.
|
|
*/
|
|
data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL);
|
|
if (data < 0) {
|
|
dev_err(&client->dev,
|
|
"Unable to read output control register\n");
|
|
return -EIO;
|
|
}
|
|
|
|
/*
|
|
* Write the configuration key register to enable access to
|
|
* the config2 register
|
|
*/
|
|
if (abx80x_write_config_key(client, ABX8XX_CFG_KEY_MISC) < 0)
|
|
return -EIO;
|
|
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL,
|
|
data | ABX8XX_OUT_CTRL_EXDS);
|
|
if (err < 0) {
|
|
dev_err(&client->dev,
|
|
"Unable to write output control register\n");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
/* part autodetection */
|
|
if (part == ABX80X) {
|
|
for (i = 0; abx80x_caps[i].pn; i++)
|
|
if (partnumber == abx80x_caps[i].pn)
|
|
break;
|
|
if (abx80x_caps[i].pn == 0) {
|
|
dev_err(&client->dev, "Unknown part: %04x\n",
|
|
partnumber);
|
|
return -EINVAL;
|
|
}
|
|
part = i;
|
|
}
|
|
|
|
if (partnumber != abx80x_caps[part].pn) {
|
|
dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
|
|
partnumber, abx80x_caps[part].pn);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (np && abx80x_caps[part].has_tc)
|
|
trickle_cfg = abx80x_dt_trickle_cfg(client);
|
|
|
|
if (trickle_cfg > 0) {
|
|
dev_info(&client->dev, "Enabling trickle charger: %02x\n",
|
|
trickle_cfg);
|
|
abx80x_enable_trickle_charger(client, trickle_cfg);
|
|
}
|
|
|
|
err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
|
|
BIT(2));
|
|
if (err)
|
|
return err;
|
|
|
|
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (priv == NULL)
|
|
return -ENOMEM;
|
|
|
|
priv->rtc = devm_rtc_allocate_device(&client->dev);
|
|
if (IS_ERR(priv->rtc))
|
|
return PTR_ERR(priv->rtc);
|
|
|
|
priv->rtc->ops = &abx80x_rtc_ops;
|
|
priv->client = client;
|
|
|
|
i2c_set_clientdata(client, priv);
|
|
|
|
if (abx80x_caps[part].has_wdog) {
|
|
err = abx80x_setup_watchdog(priv);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (client->irq > 0) {
|
|
dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
|
|
err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
|
|
abx80x_handle_irq,
|
|
IRQF_SHARED | IRQF_ONESHOT,
|
|
"abx8xx",
|
|
client);
|
|
if (err) {
|
|
dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
|
|
client->irq = 0;
|
|
}
|
|
}
|
|
|
|
err = rtc_add_group(priv->rtc, &rtc_calib_attr_group);
|
|
if (err) {
|
|
dev_err(&client->dev, "Failed to create sysfs group: %d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
return devm_rtc_register_device(priv->rtc);
|
|
}
|
|
|
|
static const struct i2c_device_id abx80x_id[] = {
|
|
{ "abx80x", ABX80X },
|
|
{ "ab0801", AB0801 },
|
|
{ "ab0803", AB0803 },
|
|
{ "ab0804", AB0804 },
|
|
{ "ab0805", AB0805 },
|
|
{ "ab1801", AB1801 },
|
|
{ "ab1803", AB1803 },
|
|
{ "ab1804", AB1804 },
|
|
{ "ab1805", AB1805 },
|
|
{ "rv1805", RV1805 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, abx80x_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id abx80x_of_match[] = {
|
|
{
|
|
.compatible = "abracon,abx80x",
|
|
.data = (void *)ABX80X
|
|
},
|
|
{
|
|
.compatible = "abracon,ab0801",
|
|
.data = (void *)AB0801
|
|
},
|
|
{
|
|
.compatible = "abracon,ab0803",
|
|
.data = (void *)AB0803
|
|
},
|
|
{
|
|
.compatible = "abracon,ab0804",
|
|
.data = (void *)AB0804
|
|
},
|
|
{
|
|
.compatible = "abracon,ab0805",
|
|
.data = (void *)AB0805
|
|
},
|
|
{
|
|
.compatible = "abracon,ab1801",
|
|
.data = (void *)AB1801
|
|
},
|
|
{
|
|
.compatible = "abracon,ab1803",
|
|
.data = (void *)AB1803
|
|
},
|
|
{
|
|
.compatible = "abracon,ab1804",
|
|
.data = (void *)AB1804
|
|
},
|
|
{
|
|
.compatible = "abracon,ab1805",
|
|
.data = (void *)AB1805
|
|
},
|
|
{
|
|
.compatible = "microcrystal,rv1805",
|
|
.data = (void *)RV1805
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, abx80x_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver abx80x_driver = {
|
|
.driver = {
|
|
.name = "rtc-abx80x",
|
|
.of_match_table = of_match_ptr(abx80x_of_match),
|
|
},
|
|
.probe = abx80x_probe,
|
|
.id_table = abx80x_id,
|
|
};
|
|
|
|
module_i2c_driver(abx80x_driver);
|
|
|
|
MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
|
|
MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
|
|
MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
|
|
MODULE_LICENSE("GPL v2");
|