--- /dev/null
+/*
+ * Copyright (C) 2016 National Instruments Corp.
+ *
+ * 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.
+ */
+
+#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");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff