linux/drivers/leds/leds-nic78bx.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  it will be useful but without any warranty without even the implied
  warranty of merchantability or fitness for a particular purpose see
  the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

201 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 National Instruments Corp.
*/
#include <linux/acpi.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#define NIC78BX_USER1_LED_MASK 0x3
#define NIC78BX_USER1_GREEN_LED BIT(0)
#define NIC78BX_USER1_YELLOW_LED BIT(1)
#define NIC78BX_USER2_LED_MASK 0xC
#define NIC78BX_USER2_GREEN_LED BIT(2)
#define NIC78BX_USER2_YELLOW_LED BIT(3)
#define NIC78BX_LOCK_REG_OFFSET 1
#define NIC78BX_LOCK_VALUE 0xA5
#define NIC78BX_UNLOCK_VALUE 0x5A
#define NIC78BX_USER_LED_IO_SIZE 2
struct nic78bx_led_data {
u16 io_base;
spinlock_t lock;
struct platform_device *pdev;
};
struct nic78bx_led {
u8 bit;
u8 mask;
struct nic78bx_led_data *data;
struct led_classdev cdev;
};
static inline struct nic78bx_led *to_nic78bx_led(struct led_classdev *cdev)
{
return container_of(cdev, struct nic78bx_led, cdev);
}
static void nic78bx_brightness_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct nic78bx_led *nled = to_nic78bx_led(cdev);
unsigned long flags;
u8 value;
spin_lock_irqsave(&nled->data->lock, flags);
value = inb(nled->data->io_base);
if (brightness) {
value &= ~nled->mask;
value |= nled->bit;
} else {
value &= ~nled->bit;
}
outb(value, nled->data->io_base);
spin_unlock_irqrestore(&nled->data->lock, flags);
}
static enum led_brightness nic78bx_brightness_get(struct led_classdev *cdev)
{
struct nic78bx_led *nled = to_nic78bx_led(cdev);
unsigned long flags;
u8 value;
spin_lock_irqsave(&nled->data->lock, flags);
value = inb(nled->data->io_base);
spin_unlock_irqrestore(&nled->data->lock, flags);
return (value & nled->bit) ? 1 : LED_OFF;
}
static struct nic78bx_led nic78bx_leds[] = {
{
.bit = NIC78BX_USER1_GREEN_LED,
.mask = NIC78BX_USER1_LED_MASK,
.cdev = {
.name = "nilrt:green:user1",
.max_brightness = 1,
.brightness_set = nic78bx_brightness_set,
.brightness_get = nic78bx_brightness_get,
}
},
{
.bit = NIC78BX_USER1_YELLOW_LED,
.mask = NIC78BX_USER1_LED_MASK,
.cdev = {
.name = "nilrt:yellow:user1",
.max_brightness = 1,
.brightness_set = nic78bx_brightness_set,
.brightness_get = nic78bx_brightness_get,
}
},
{
.bit = NIC78BX_USER2_GREEN_LED,
.mask = NIC78BX_USER2_LED_MASK,
.cdev = {
.name = "nilrt:green:user2",
.max_brightness = 1,
.brightness_set = nic78bx_brightness_set,
.brightness_get = nic78bx_brightness_get,
}
},
{
.bit = NIC78BX_USER2_YELLOW_LED,
.mask = NIC78BX_USER2_LED_MASK,
.cdev = {
.name = "nilrt:yellow:user2",
.max_brightness = 1,
.brightness_set = nic78bx_brightness_set,
.brightness_get = nic78bx_brightness_get,
}
}
};
static int nic78bx_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct nic78bx_led_data *led_data;
struct resource *io_rc;
int ret, i;
led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
if (!led_data)
return -ENOMEM;
led_data->pdev = pdev;
platform_set_drvdata(pdev, led_data);
io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!io_rc) {
dev_err(dev, "missing IO resources\n");
return -EINVAL;
}
if (resource_size(io_rc) < NIC78BX_USER_LED_IO_SIZE) {
dev_err(dev, "IO region too small\n");
return -EINVAL;
}
if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),
KBUILD_MODNAME)) {
dev_err(dev, "failed to get IO region\n");
return -EBUSY;
}
led_data->io_base = io_rc->start;
spin_lock_init(&led_data->lock);
for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) {
nic78bx_leds[i].data = led_data;
ret = devm_led_classdev_register(dev, &nic78bx_leds[i].cdev);
if (ret)
return ret;
}
/* Unlock LED register */
outb(NIC78BX_UNLOCK_VALUE,
led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
return ret;
}
static int nic78bx_remove(struct platform_device *pdev)
{
struct nic78bx_led_data *led_data = platform_get_drvdata(pdev);
/* Lock LED register */
outb(NIC78BX_LOCK_VALUE,
led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
return 0;
}
static const struct acpi_device_id led_device_ids[] = {
{"NIC78B3", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, led_device_ids);
static struct platform_driver led_driver = {
.probe = nic78bx_probe,
.remove = nic78bx_remove,
.driver = {
.name = KBUILD_MODNAME,
.acpi_match_table = ACPI_PTR(led_device_ids),
},
};
module_platform_driver(led_driver);
MODULE_DESCRIPTION("National Instruments PXI User LEDs driver");
MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
MODULE_LICENSE("GPL");