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257 lines
6.2 KiB
257 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 National Instruments Corp. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/device.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/watchdog.h> |
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#define NIWD_CONTROL 0x01 |
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#define NIWD_COUNTER2 0x02 |
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#define NIWD_COUNTER1 0x03 |
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#define NIWD_COUNTER0 0x04 |
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#define NIWD_SEED2 0x05 |
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#define NIWD_SEED1 0x06 |
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#define NIWD_SEED0 0x07 |
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#define NIWD_IO_SIZE 0x08 |
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#define NIWD_CONTROL_MODE 0x80 |
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#define NIWD_CONTROL_PROC_RESET 0x20 |
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#define NIWD_CONTROL_PET 0x10 |
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#define NIWD_CONTROL_RUNNING 0x08 |
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#define NIWD_CONTROL_CAPTURECOUNTER 0x04 |
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#define NIWD_CONTROL_RESET 0x02 |
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#define NIWD_CONTROL_ALARM 0x01 |
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#define NIWD_PERIOD_NS 30720 |
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#define NIWD_MIN_TIMEOUT 1 |
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#define NIWD_MAX_TIMEOUT 515 |
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#define NIWD_DEFAULT_TIMEOUT 60 |
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#define NIWD_NAME "ni903x_wdt" |
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struct ni903x_wdt { |
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struct device *dev; |
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u16 io_base; |
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struct watchdog_device wdd; |
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}; |
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static unsigned int timeout; |
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module_param(timeout, uint, 0); |
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MODULE_PARM_DESC(timeout, |
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"Watchdog timeout in seconds. (default=" |
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__MODULE_STRING(NIWD_DEFAULT_TIMEOUT) ")"); |
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static int nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, int, S_IRUGO); |
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MODULE_PARM_DESC(nowayout, |
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"Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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static void ni903x_start(struct ni903x_wdt *wdt) |
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{ |
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u8 control = inb(wdt->io_base + NIWD_CONTROL); |
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outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); |
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outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); |
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} |
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static int ni903x_wdd_set_timeout(struct watchdog_device *wdd, |
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unsigned int timeout) |
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{ |
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
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u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS); |
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outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2); |
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outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1); |
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outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0); |
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wdd->timeout = timeout; |
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return 0; |
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} |
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static unsigned int ni903x_wdd_get_timeleft(struct watchdog_device *wdd) |
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{ |
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
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u8 control, counter0, counter1, counter2; |
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u32 counter; |
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control = inb(wdt->io_base + NIWD_CONTROL); |
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control |= NIWD_CONTROL_CAPTURECOUNTER; |
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outb(control, wdt->io_base + NIWD_CONTROL); |
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counter2 = inb(wdt->io_base + NIWD_COUNTER2); |
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counter1 = inb(wdt->io_base + NIWD_COUNTER1); |
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counter0 = inb(wdt->io_base + NIWD_COUNTER0); |
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counter = (counter2 << 16) | (counter1 << 8) | counter0; |
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return counter / (1000000000 / NIWD_PERIOD_NS); |
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} |
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static int ni903x_wdd_ping(struct watchdog_device *wdd) |
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{ |
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
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u8 control; |
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control = inb(wdt->io_base + NIWD_CONTROL); |
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outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); |
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return 0; |
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} |
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static int ni903x_wdd_start(struct watchdog_device *wdd) |
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{ |
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
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outb(NIWD_CONTROL_RESET | NIWD_CONTROL_PROC_RESET, |
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wdt->io_base + NIWD_CONTROL); |
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ni903x_wdd_set_timeout(wdd, wdd->timeout); |
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ni903x_start(wdt); |
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return 0; |
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} |
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static int ni903x_wdd_stop(struct watchdog_device *wdd) |
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{ |
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struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
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outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); |
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return 0; |
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} |
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static acpi_status ni903x_resources(struct acpi_resource *res, void *data) |
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{ |
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struct ni903x_wdt *wdt = data; |
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u16 io_size; |
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switch (res->type) { |
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case ACPI_RESOURCE_TYPE_IO: |
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if (wdt->io_base != 0) { |
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dev_err(wdt->dev, "too many IO resources\n"); |
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return AE_ERROR; |
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} |
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wdt->io_base = res->data.io.minimum; |
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io_size = res->data.io.address_length; |
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if (io_size < NIWD_IO_SIZE) { |
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dev_err(wdt->dev, "memory region too small\n"); |
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return AE_ERROR; |
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} |
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if (!devm_request_region(wdt->dev, wdt->io_base, io_size, |
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NIWD_NAME)) { |
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dev_err(wdt->dev, "failed to get memory region\n"); |
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return AE_ERROR; |
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} |
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return AE_OK; |
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case ACPI_RESOURCE_TYPE_END_TAG: |
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default: |
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/* Ignore unsupported resources, e.g. IRQ */ |
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return AE_OK; |
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} |
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} |
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static const struct watchdog_info ni903x_wdd_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
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.identity = "NI Watchdog", |
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}; |
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static const struct watchdog_ops ni903x_wdd_ops = { |
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.owner = THIS_MODULE, |
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.start = ni903x_wdd_start, |
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.stop = ni903x_wdd_stop, |
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.ping = ni903x_wdd_ping, |
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.set_timeout = ni903x_wdd_set_timeout, |
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.get_timeleft = ni903x_wdd_get_timeleft, |
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}; |
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static int ni903x_acpi_add(struct acpi_device *device) |
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{ |
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struct device *dev = &device->dev; |
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struct watchdog_device *wdd; |
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struct ni903x_wdt *wdt; |
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acpi_status status; |
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int ret; |
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wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); |
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if (!wdt) |
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return -ENOMEM; |
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device->driver_data = wdt; |
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wdt->dev = dev; |
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status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
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ni903x_resources, wdt); |
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if (ACPI_FAILURE(status) || wdt->io_base == 0) { |
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dev_err(dev, "failed to get resources\n"); |
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return -ENODEV; |
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} |
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wdd = &wdt->wdd; |
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wdd->info = &ni903x_wdd_info; |
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wdd->ops = &ni903x_wdd_ops; |
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wdd->min_timeout = NIWD_MIN_TIMEOUT; |
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wdd->max_timeout = NIWD_MAX_TIMEOUT; |
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wdd->timeout = NIWD_DEFAULT_TIMEOUT; |
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wdd->parent = dev; |
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watchdog_set_drvdata(wdd, wdt); |
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watchdog_set_nowayout(wdd, nowayout); |
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watchdog_init_timeout(wdd, timeout, dev); |
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ret = watchdog_register_device(wdd); |
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if (ret) |
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return ret; |
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/* Switch from boot mode to user mode */ |
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outb(NIWD_CONTROL_RESET | NIWD_CONTROL_MODE, |
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wdt->io_base + NIWD_CONTROL); |
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dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n", |
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wdt->io_base, timeout, nowayout); |
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return 0; |
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} |
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static int ni903x_acpi_remove(struct acpi_device *device) |
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{ |
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struct ni903x_wdt *wdt = acpi_driver_data(device); |
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ni903x_wdd_stop(&wdt->wdd); |
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watchdog_unregister_device(&wdt->wdd); |
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return 0; |
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} |
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static const struct acpi_device_id ni903x_device_ids[] = { |
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{"NIC775C", 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, ni903x_device_ids); |
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static struct acpi_driver ni903x_acpi_driver = { |
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.name = NIWD_NAME, |
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.ids = ni903x_device_ids, |
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.ops = { |
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.add = ni903x_acpi_add, |
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.remove = ni903x_acpi_remove, |
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}, |
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}; |
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module_acpi_driver(ni903x_acpi_driver); |
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MODULE_DESCRIPTION("NI 903x Watchdog"); |
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MODULE_AUTHOR("Jeff Westfahl <[email protected]>"); |
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MODULE_AUTHOR("Kyle Roeschley <[email protected]>"); |
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MODULE_LICENSE("GPL");
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