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926 lines
22 KiB
926 lines
22 KiB
// 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 <[email protected]> |
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* Author: Alexandre Belloni <[email protected]> |
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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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|
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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 |
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flags |= (ABX8XX_OSC_OSEL); |
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|
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/* Unlock write access on 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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if (retval < 0) { |
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dev_err(dev, "Failed to write Oscillator Control register\n"); |
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return retval; |
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} |
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|
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return retval ? retval : count; |
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} |
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|
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static ssize_t oscillator_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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int rc_mode = 0; |
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struct i2c_client *client = to_i2c_client(dev->parent); |
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rc_mode = abx80x_is_rc_mode(client); |
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|
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if (rc_mode < 0) { |
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dev_err(dev, "Failed to read RTC oscillator selection\n"); |
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sprintf(buf, "\n"); |
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return rc_mode; |
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} |
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|
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if (rc_mode) |
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return sprintf(buf, "rc\n"); |
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else |
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return sprintf(buf, "xtal\n"); |
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} |
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|
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static DEVICE_ATTR_RW(oscillator); |
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|
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static struct attribute *rtc_calib_attrs[] = { |
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&dev_attr_autocalibration.attr, |
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&dev_attr_oscillator.attr, |
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NULL, |
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}; |
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|
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static const struct attribute_group rtc_calib_attr_group = { |
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.attrs = rtc_calib_attrs, |
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}; |
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|
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static int abx80x_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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int err; |
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|
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if (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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else |
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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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return err; |
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} |
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|
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static int abx80x_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); |
|
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 <[email protected]>"); |
|
MODULE_AUTHOR("Alexandre Belloni <[email protected]>"); |
|
MODULE_DESCRIPTION("Abracon ABX80X RTC driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|