mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 03:55:20 +07:00
4672c2f202
Subsystem: - fix warnings and errors with make W=1 - UIE are now disabled while setting the RTC time - UIE are now disallowed when the RTC time is not set. Drivers: - remove unecessary .remove callbacks - Set RTC range for cros-ec, ds1343, ds1347, m41t80, s35390a, vt8500 - Use devm_platform_ioremap_resource where applicable - rv3028: add clock out support -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEycoQi/giopmpPgB12wIijOdRNOUFAl3k7FMACgkQ2wIijOdR NOX63hAAqeoBWKVHgh5kltmtd7RCWD3cazleYvPPfCyoNUOz1YB6Gblp4R+5ImNT pFfbhk44baMDBSy5zlJV4yLkdsBYx5Yx7Su56zAqMYhpnVbvwGeNOsoWLaJThc3o b8NK9Za9CwwZNm3CDoPdJNeHNOce20Hj9JKCeOyS3Gl7IuMP+0xGXlPVpM0yX4EW 7iwuGhnQNWFM1GQQ8WWgEr4mQB+8xwjy2hKQ2FnKfVk6cqq2wxgrY+XGjV1h1jCM x/KlmAY9sbntwEZA3ZOqk0LQvMMaKqUEfMpd24joGvo7JGseN/e4aapRXoang3vp h/mkeW3MnrsGs+YPsSQqdOSrIJ/Qou25QnMXEzRPgkBCXw0lpHkqmF3GdF6CPEFG xnGZVLrCA1W8ysJNq9ZkavZCEaG9ay6Qd8sOh7Tfl2UkPDArOC1PiKvfzVmkcYZ+ TOwgB7/Yyp9Y1l9asBQnOEzg2AZ0Rq8KlFk5vAxiyQOBpivWEw8AuNMG+W8B16NE bsc6rteNYzfLJusxuEQTdG7/AsLNun+YQoASAYaoIxnnzcslUwMRLl/JoNRQOt7D sdaTHd10I99+282hWPnFSkb3Xm44+01tX2apGPQt5Duv8ojQYHTRoPhHYmIvCkLJ HM8HWNae6bNKyUhsxDG8iFHfbAhL6ojr/AEiXw58TZjfPe3i5iw= =gBQF -----END PGP SIGNATURE----- Merge tag 'rtc-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux Pull RTC updates from Alexandre Belloni: "A lot of unnecessary code removal in here that ends up decreasing the number of lines in the subsystem. The ds1343 and ds1347 drivers got cleaned up. The rest are the usual fixes and new features. Subsystem: - fix warnings and errors with make W=1 - UIE are now disabled while setting the RTC time - UIE are now disallowed when the RTC time is not set. Drivers: - remove unecessary .remove callbacks - Set RTC range for cros-ec, ds1343, ds1347, m41t80, s35390a, vt8500 - Use devm_platform_ioremap_resource where applicable - rv3028: add clock out support" * tag 'rtc-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (81 commits) rtc: Fix Kconfig indentation rtc: xgene: Remove unused struct device in struct xgene_rtc_dev rtc: sun6i: Remove struct device from sun6i_rtc_dev rtc: st-lpc: Remove struct resource from struct st_rtc rtc: pcf8523: Remove struct pcf8523 rtc: meson: remove redundant assignment to variable retries rtc: v3020: remove set but unused variable rtc: tegra: remove set but unused variable rtc: pm8xxx: update kerneldoc for struct pm8xxx_rtc rtc: m41t80: remove excess kerneldoc rtc: ds1685: fix build error with make W=1 rtc: ds1685: remove set but unused variables rtc: ds1374: remove unused variable rtc: sysfs: fix hctosys_show kerneldoc rtc: interface: fix kerneldoc comments rtc: msm6242: Remove unneeded msm6242_set()/msm6242_clear() functions rtc: msm6242: Fix reading of 10-hour digit rtc: tps65910: allow using RTC without alarm interrupt rtc: fsl-ftm-alarm: remove select FSL_RCPM and default y from Kconfig rtc: pcf8563: Constify clkout_rates ...
726 lines
17 KiB
C
726 lines
17 KiB
C
/*
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* RTC client/driver for the Maxim/Dallas DS1374 Real-Time Clock over I2C
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*
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* Based on code by Randy Vinson <rvinson@mvista.com>,
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* which was based on the m41t00.c by Mark Greer <mgreer@mvista.com>.
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*
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* Copyright (C) 2014 Rose Technology
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* Copyright (C) 2006-2007 Freescale Semiconductor
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*
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* 2005 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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/*
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* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
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* recommended in .../Documentation/i2c/writing-clients.rst section
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* "Sending and receiving", using SMBus level communication is preferred.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/pm.h>
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#ifdef CONFIG_RTC_DRV_DS1374_WDT
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/miscdevice.h>
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#include <linux/reboot.h>
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#include <linux/watchdog.h>
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#endif
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#define DS1374_REG_TOD0 0x00 /* Time of Day */
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#define DS1374_REG_TOD1 0x01
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#define DS1374_REG_TOD2 0x02
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#define DS1374_REG_TOD3 0x03
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#define DS1374_REG_WDALM0 0x04 /* Watchdog/Alarm */
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#define DS1374_REG_WDALM1 0x05
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#define DS1374_REG_WDALM2 0x06
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#define DS1374_REG_CR 0x07 /* Control */
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#define DS1374_REG_CR_AIE 0x01 /* Alarm Int. Enable */
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#define DS1374_REG_CR_WDALM 0x20 /* 1=Watchdog, 0=Alarm */
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#define DS1374_REG_CR_WACE 0x40 /* WD/Alarm counter enable */
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#define DS1374_REG_SR 0x08 /* Status */
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#define DS1374_REG_SR_OSF 0x80 /* Oscillator Stop Flag */
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#define DS1374_REG_SR_AF 0x01 /* Alarm Flag */
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#define DS1374_REG_TCR 0x09 /* Trickle Charge */
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static const struct i2c_device_id ds1374_id[] = {
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{ "ds1374", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ds1374_id);
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#ifdef CONFIG_OF
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static const struct of_device_id ds1374_of_match[] = {
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{ .compatible = "dallas,ds1374" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ds1374_of_match);
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#endif
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struct ds1374 {
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struct i2c_client *client;
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struct rtc_device *rtc;
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struct work_struct work;
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/* The mutex protects alarm operations, and prevents a race
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* between the enable_irq() in the workqueue and the free_irq()
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* in the remove function.
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*/
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struct mutex mutex;
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int exiting;
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};
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static struct i2c_driver ds1374_driver;
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static int ds1374_read_rtc(struct i2c_client *client, u32 *time,
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int reg, int nbytes)
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{
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u8 buf[4];
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int ret;
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int i;
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if (WARN_ON(nbytes > 4))
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return -EINVAL;
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ret = i2c_smbus_read_i2c_block_data(client, reg, nbytes, buf);
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if (ret < 0)
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return ret;
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if (ret < nbytes)
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return -EIO;
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for (i = nbytes - 1, *time = 0; i >= 0; i--)
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*time = (*time << 8) | buf[i];
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return 0;
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}
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static int ds1374_write_rtc(struct i2c_client *client, u32 time,
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int reg, int nbytes)
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{
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u8 buf[4];
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int i;
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if (nbytes > 4) {
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WARN_ON(1);
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return -EINVAL;
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}
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for (i = 0; i < nbytes; i++) {
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buf[i] = time & 0xff;
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time >>= 8;
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}
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return i2c_smbus_write_i2c_block_data(client, reg, nbytes, buf);
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}
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static int ds1374_check_rtc_status(struct i2c_client *client)
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{
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int ret = 0;
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int control, stat;
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stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
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if (stat < 0)
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return stat;
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if (stat & DS1374_REG_SR_OSF)
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dev_warn(&client->dev,
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"oscillator discontinuity flagged, time unreliable\n");
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stat &= ~(DS1374_REG_SR_OSF | DS1374_REG_SR_AF);
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ret = i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
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if (ret < 0)
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return ret;
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/* If the alarm is pending, clear it before requesting
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* the interrupt, so an interrupt event isn't reported
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* before everything is initialized.
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*/
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control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
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if (control < 0)
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return control;
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control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
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return i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
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}
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static int ds1374_read_time(struct device *dev, struct rtc_time *time)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u32 itime;
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int ret;
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ret = ds1374_read_rtc(client, &itime, DS1374_REG_TOD0, 4);
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if (!ret)
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rtc_time_to_tm(itime, time);
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return ret;
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}
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static int ds1374_set_time(struct device *dev, struct rtc_time *time)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long itime;
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rtc_tm_to_time(time, &itime);
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return ds1374_write_rtc(client, itime, DS1374_REG_TOD0, 4);
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}
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#ifndef CONFIG_RTC_DRV_DS1374_WDT
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/* The ds1374 has a decrementer for an alarm, rather than a comparator.
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* If the time of day is changed, then the alarm will need to be
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* reset.
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*/
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static int ds1374_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds1374 *ds1374 = i2c_get_clientdata(client);
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u32 now, cur_alarm;
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int cr, sr;
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int ret = 0;
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if (client->irq <= 0)
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return -EINVAL;
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mutex_lock(&ds1374->mutex);
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cr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
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if (ret < 0)
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goto out;
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sr = ret = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
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if (ret < 0)
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goto out;
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ret = ds1374_read_rtc(client, &now, DS1374_REG_TOD0, 4);
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if (ret)
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goto out;
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ret = ds1374_read_rtc(client, &cur_alarm, DS1374_REG_WDALM0, 3);
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if (ret)
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goto out;
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rtc_time_to_tm(now + cur_alarm, &alarm->time);
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alarm->enabled = !!(cr & DS1374_REG_CR_WACE);
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alarm->pending = !!(sr & DS1374_REG_SR_AF);
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out:
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mutex_unlock(&ds1374->mutex);
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return ret;
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}
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static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ds1374 *ds1374 = i2c_get_clientdata(client);
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struct rtc_time now;
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unsigned long new_alarm, itime;
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int cr;
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int ret = 0;
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if (client->irq <= 0)
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return -EINVAL;
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ret = ds1374_read_time(dev, &now);
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if (ret < 0)
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return ret;
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rtc_tm_to_time(&alarm->time, &new_alarm);
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rtc_tm_to_time(&now, &itime);
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/* This can happen due to races, in addition to dates that are
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* truly in the past. To avoid requiring the caller to check for
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* races, dates in the past are assumed to be in the recent past
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* (i.e. not something that we'd rather the caller know about via
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* an error), and the alarm is set to go off as soon as possible.
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*/
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if (time_before_eq(new_alarm, itime))
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new_alarm = 1;
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else
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new_alarm -= itime;
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mutex_lock(&ds1374->mutex);
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ret = cr = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
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if (ret < 0)
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goto out;
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/* Disable any existing alarm before setting the new one
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* (or lack thereof). */
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cr &= ~DS1374_REG_CR_WACE;
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ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
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if (ret < 0)
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goto out;
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ret = ds1374_write_rtc(client, new_alarm, DS1374_REG_WDALM0, 3);
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if (ret)
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goto out;
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if (alarm->enabled) {
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cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
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cr &= ~DS1374_REG_CR_WDALM;
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ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, cr);
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}
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out:
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mutex_unlock(&ds1374->mutex);
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return ret;
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}
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#endif
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static irqreturn_t ds1374_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 ds1374 *ds1374 = i2c_get_clientdata(client);
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disable_irq_nosync(irq);
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schedule_work(&ds1374->work);
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return IRQ_HANDLED;
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}
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static void ds1374_work(struct work_struct *work)
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{
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struct ds1374 *ds1374 = container_of(work, struct ds1374, work);
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struct i2c_client *client = ds1374->client;
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int stat, control;
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mutex_lock(&ds1374->mutex);
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stat = i2c_smbus_read_byte_data(client, DS1374_REG_SR);
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if (stat < 0)
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goto unlock;
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if (stat & DS1374_REG_SR_AF) {
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stat &= ~DS1374_REG_SR_AF;
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i2c_smbus_write_byte_data(client, DS1374_REG_SR, stat);
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control = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
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if (control < 0)
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goto out;
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control &= ~(DS1374_REG_CR_WACE | DS1374_REG_CR_AIE);
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i2c_smbus_write_byte_data(client, DS1374_REG_CR, control);
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rtc_update_irq(ds1374->rtc, 1, RTC_AF | RTC_IRQF);
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}
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out:
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if (!ds1374->exiting)
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enable_irq(client->irq);
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unlock:
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mutex_unlock(&ds1374->mutex);
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}
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#ifndef CONFIG_RTC_DRV_DS1374_WDT
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static int ds1374_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 ds1374 *ds1374 = i2c_get_clientdata(client);
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int ret;
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mutex_lock(&ds1374->mutex);
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ret = i2c_smbus_read_byte_data(client, DS1374_REG_CR);
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if (ret < 0)
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goto out;
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if (enabled) {
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ret |= DS1374_REG_CR_WACE | DS1374_REG_CR_AIE;
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ret &= ~DS1374_REG_CR_WDALM;
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} else {
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ret &= ~DS1374_REG_CR_WACE;
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}
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ret = i2c_smbus_write_byte_data(client, DS1374_REG_CR, ret);
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out:
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mutex_unlock(&ds1374->mutex);
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return ret;
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}
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#endif
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static const struct rtc_class_ops ds1374_rtc_ops = {
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.read_time = ds1374_read_time,
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.set_time = ds1374_set_time,
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#ifndef CONFIG_RTC_DRV_DS1374_WDT
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.read_alarm = ds1374_read_alarm,
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.set_alarm = ds1374_set_alarm,
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.alarm_irq_enable = ds1374_alarm_irq_enable,
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#endif
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};
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#ifdef CONFIG_RTC_DRV_DS1374_WDT
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/*
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*****************************************************************************
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*
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* Watchdog Driver
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*
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*****************************************************************************
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*/
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static struct i2c_client *save_client;
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/* Default margin */
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#define WD_TIMO 131762
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#define DRV_NAME "DS1374 Watchdog"
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static int wdt_margin = WD_TIMO;
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static unsigned long wdt_is_open;
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module_param(wdt_margin, int, 0);
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MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 32s)");
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static const struct watchdog_info ds1374_wdt_info = {
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.identity = "DS1374 WTD",
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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};
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static int ds1374_wdt_settimeout(unsigned int timeout)
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{
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int ret = -ENOIOCTLCMD;
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int cr;
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ret = cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
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if (ret < 0)
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goto out;
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/* Disable any existing watchdog/alarm before setting the new one */
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cr &= ~DS1374_REG_CR_WACE;
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ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
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if (ret < 0)
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goto out;
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/* Set new watchdog time */
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ret = ds1374_write_rtc(save_client, timeout, DS1374_REG_WDALM0, 3);
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if (ret) {
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pr_info("couldn't set new watchdog time\n");
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goto out;
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}
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/* Enable watchdog timer */
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cr |= DS1374_REG_CR_WACE | DS1374_REG_CR_WDALM;
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cr &= ~DS1374_REG_CR_AIE;
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ret = i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
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if (ret < 0)
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goto out;
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return 0;
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out:
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return ret;
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}
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|
/*
|
|
* Reload the watchdog timer. (ie, pat the watchdog)
|
|
*/
|
|
static void ds1374_wdt_ping(void)
|
|
{
|
|
u32 val;
|
|
int ret = 0;
|
|
|
|
ret = ds1374_read_rtc(save_client, &val, DS1374_REG_WDALM0, 3);
|
|
if (ret)
|
|
pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
|
|
}
|
|
|
|
static void ds1374_wdt_disable(void)
|
|
{
|
|
int cr;
|
|
|
|
cr = i2c_smbus_read_byte_data(save_client, DS1374_REG_CR);
|
|
/* Disable watchdog timer */
|
|
cr &= ~DS1374_REG_CR_WACE;
|
|
|
|
i2c_smbus_write_byte_data(save_client, DS1374_REG_CR, cr);
|
|
}
|
|
|
|
/*
|
|
* Watchdog device is opened, and watchdog starts running.
|
|
*/
|
|
static int ds1374_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
|
|
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
|
|
mutex_lock(&ds1374->mutex);
|
|
if (test_and_set_bit(0, &wdt_is_open)) {
|
|
mutex_unlock(&ds1374->mutex);
|
|
return -EBUSY;
|
|
}
|
|
/*
|
|
* Activate
|
|
*/
|
|
wdt_is_open = 1;
|
|
mutex_unlock(&ds1374->mutex);
|
|
return stream_open(inode, file);
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/*
|
|
* Close the watchdog device.
|
|
*/
|
|
static int ds1374_wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
|
|
clear_bit(0, &wdt_is_open);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pat the watchdog whenever device is written to.
|
|
*/
|
|
static ssize_t ds1374_wdt_write(struct file *file, const char __user *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
if (len) {
|
|
ds1374_wdt_ping();
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ds1374_wdt_read(struct file *file, char __user *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle commands from user-space.
|
|
*/
|
|
static long ds1374_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int new_margin, options;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
return copy_to_user((struct watchdog_info __user *)arg,
|
|
&ds1374_wdt_info, sizeof(ds1374_wdt_info)) ? -EFAULT : 0;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
case WDIOC_GETBOOTSTATUS:
|
|
return put_user(0, (int __user *)arg);
|
|
case WDIOC_KEEPALIVE:
|
|
ds1374_wdt_ping();
|
|
return 0;
|
|
case WDIOC_SETTIMEOUT:
|
|
if (get_user(new_margin, (int __user *)arg))
|
|
return -EFAULT;
|
|
|
|
/* the hardware's tick rate is 4096 Hz, so
|
|
* the counter value needs to be scaled accordingly
|
|
*/
|
|
new_margin <<= 12;
|
|
if (new_margin < 1 || new_margin > 16777216)
|
|
return -EINVAL;
|
|
|
|
wdt_margin = new_margin;
|
|
ds1374_wdt_settimeout(new_margin);
|
|
ds1374_wdt_ping();
|
|
/* fallthrough */
|
|
case WDIOC_GETTIMEOUT:
|
|
/* when returning ... inverse is true */
|
|
return put_user((wdt_margin >> 12), (int __user *)arg);
|
|
case WDIOC_SETOPTIONS:
|
|
if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
if (options & WDIOS_DISABLECARD) {
|
|
pr_info("disable watchdog\n");
|
|
ds1374_wdt_disable();
|
|
return 0;
|
|
}
|
|
|
|
if (options & WDIOS_ENABLECARD) {
|
|
pr_info("enable watchdog\n");
|
|
ds1374_wdt_settimeout(wdt_margin);
|
|
ds1374_wdt_ping();
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static long ds1374_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret;
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(save_client);
|
|
|
|
mutex_lock(&ds1374->mutex);
|
|
ret = ds1374_wdt_ioctl(file, cmd, arg);
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ds1374_wdt_notify_sys(struct notifier_block *this,
|
|
unsigned long code, void *unused)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
/* Disable Watchdog */
|
|
ds1374_wdt_disable();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static const struct file_operations ds1374_wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ds1374_wdt_read,
|
|
.unlocked_ioctl = ds1374_wdt_unlocked_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.write = ds1374_wdt_write,
|
|
.open = ds1374_wdt_open,
|
|
.release = ds1374_wdt_release,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice ds1374_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &ds1374_wdt_fops,
|
|
};
|
|
|
|
static struct notifier_block ds1374_wdt_notifier = {
|
|
.notifier_call = ds1374_wdt_notify_sys,
|
|
};
|
|
|
|
#endif /*CONFIG_RTC_DRV_DS1374_WDT*/
|
|
/*
|
|
*****************************************************************************
|
|
*
|
|
* Driver Interface
|
|
*
|
|
*****************************************************************************
|
|
*/
|
|
static int ds1374_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ds1374 *ds1374;
|
|
int ret;
|
|
|
|
ds1374 = devm_kzalloc(&client->dev, sizeof(struct ds1374), GFP_KERNEL);
|
|
if (!ds1374)
|
|
return -ENOMEM;
|
|
|
|
ds1374->client = client;
|
|
i2c_set_clientdata(client, ds1374);
|
|
|
|
INIT_WORK(&ds1374->work, ds1374_work);
|
|
mutex_init(&ds1374->mutex);
|
|
|
|
ret = ds1374_check_rtc_status(client);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (client->irq > 0) {
|
|
ret = devm_request_irq(&client->dev, client->irq, ds1374_irq, 0,
|
|
"ds1374", client);
|
|
if (ret) {
|
|
dev_err(&client->dev, "unable to request IRQ\n");
|
|
return ret;
|
|
}
|
|
|
|
device_set_wakeup_capable(&client->dev, 1);
|
|
}
|
|
|
|
ds1374->rtc = devm_rtc_device_register(&client->dev, client->name,
|
|
&ds1374_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(ds1374->rtc)) {
|
|
dev_err(&client->dev, "unable to register the class device\n");
|
|
return PTR_ERR(ds1374->rtc);
|
|
}
|
|
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
save_client = client;
|
|
ret = misc_register(&ds1374_miscdev);
|
|
if (ret)
|
|
return ret;
|
|
ret = register_reboot_notifier(&ds1374_wdt_notifier);
|
|
if (ret) {
|
|
misc_deregister(&ds1374_miscdev);
|
|
return ret;
|
|
}
|
|
ds1374_wdt_settimeout(131072);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds1374_remove(struct i2c_client *client)
|
|
{
|
|
struct ds1374 *ds1374 = i2c_get_clientdata(client);
|
|
#ifdef CONFIG_RTC_DRV_DS1374_WDT
|
|
misc_deregister(&ds1374_miscdev);
|
|
ds1374_miscdev.parent = NULL;
|
|
unregister_reboot_notifier(&ds1374_wdt_notifier);
|
|
#endif
|
|
|
|
if (client->irq > 0) {
|
|
mutex_lock(&ds1374->mutex);
|
|
ds1374->exiting = 1;
|
|
mutex_unlock(&ds1374->mutex);
|
|
|
|
devm_free_irq(&client->dev, client->irq, client);
|
|
cancel_work_sync(&ds1374->work);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int ds1374_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (client->irq > 0 && device_may_wakeup(&client->dev))
|
|
enable_irq_wake(client->irq);
|
|
return 0;
|
|
}
|
|
|
|
static int ds1374_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (client->irq > 0 && device_may_wakeup(&client->dev))
|
|
disable_irq_wake(client->irq);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(ds1374_pm, ds1374_suspend, ds1374_resume);
|
|
|
|
static struct i2c_driver ds1374_driver = {
|
|
.driver = {
|
|
.name = "rtc-ds1374",
|
|
.of_match_table = of_match_ptr(ds1374_of_match),
|
|
.pm = &ds1374_pm,
|
|
},
|
|
.probe = ds1374_probe,
|
|
.remove = ds1374_remove,
|
|
.id_table = ds1374_id,
|
|
};
|
|
|
|
module_i2c_driver(ds1374_driver);
|
|
|
|
MODULE_AUTHOR("Scott Wood <scottwood@freescale.com>");
|
|
MODULE_DESCRIPTION("Maxim/Dallas DS1374 RTC Driver");
|
|
MODULE_LICENSE("GPL");
|