leds-nic78bx.c 4.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * Copyright (C) 2016 National Instruments Corp.
  4. */
  5. #include <linux/acpi.h>
  6. #include <linux/leds.h>
  7. #include <linux/module.h>
  8. #include <linux/platform_device.h>
  9. #include <linux/spinlock.h>
  10. #define NIC78BX_USER1_LED_MASK 0x3
  11. #define NIC78BX_USER1_GREEN_LED BIT(0)
  12. #define NIC78BX_USER1_YELLOW_LED BIT(1)
  13. #define NIC78BX_USER2_LED_MASK 0xC
  14. #define NIC78BX_USER2_GREEN_LED BIT(2)
  15. #define NIC78BX_USER2_YELLOW_LED BIT(3)
  16. #define NIC78BX_LOCK_REG_OFFSET 1
  17. #define NIC78BX_LOCK_VALUE 0xA5
  18. #define NIC78BX_UNLOCK_VALUE 0x5A
  19. #define NIC78BX_USER_LED_IO_SIZE 2
  20. struct nic78bx_led_data {
  21. u16 io_base;
  22. spinlock_t lock;
  23. struct platform_device *pdev;
  24. };
  25. struct nic78bx_led {
  26. u8 bit;
  27. u8 mask;
  28. struct nic78bx_led_data *data;
  29. struct led_classdev cdev;
  30. };
  31. static inline struct nic78bx_led *to_nic78bx_led(struct led_classdev *cdev)
  32. {
  33. return container_of(cdev, struct nic78bx_led, cdev);
  34. }
  35. static void nic78bx_brightness_set(struct led_classdev *cdev,
  36. enum led_brightness brightness)
  37. {
  38. struct nic78bx_led *nled = to_nic78bx_led(cdev);
  39. unsigned long flags;
  40. u8 value;
  41. spin_lock_irqsave(&nled->data->lock, flags);
  42. value = inb(nled->data->io_base);
  43. if (brightness) {
  44. value &= ~nled->mask;
  45. value |= nled->bit;
  46. } else {
  47. value &= ~nled->bit;
  48. }
  49. outb(value, nled->data->io_base);
  50. spin_unlock_irqrestore(&nled->data->lock, flags);
  51. }
  52. static enum led_brightness nic78bx_brightness_get(struct led_classdev *cdev)
  53. {
  54. struct nic78bx_led *nled = to_nic78bx_led(cdev);
  55. unsigned long flags;
  56. u8 value;
  57. spin_lock_irqsave(&nled->data->lock, flags);
  58. value = inb(nled->data->io_base);
  59. spin_unlock_irqrestore(&nled->data->lock, flags);
  60. return (value & nled->bit) ? 1 : LED_OFF;
  61. }
  62. static struct nic78bx_led nic78bx_leds[] = {
  63. {
  64. .bit = NIC78BX_USER1_GREEN_LED,
  65. .mask = NIC78BX_USER1_LED_MASK,
  66. .cdev = {
  67. .name = "nilrt:green:user1",
  68. .max_brightness = 1,
  69. .brightness_set = nic78bx_brightness_set,
  70. .brightness_get = nic78bx_brightness_get,
  71. }
  72. },
  73. {
  74. .bit = NIC78BX_USER1_YELLOW_LED,
  75. .mask = NIC78BX_USER1_LED_MASK,
  76. .cdev = {
  77. .name = "nilrt:yellow:user1",
  78. .max_brightness = 1,
  79. .brightness_set = nic78bx_brightness_set,
  80. .brightness_get = nic78bx_brightness_get,
  81. }
  82. },
  83. {
  84. .bit = NIC78BX_USER2_GREEN_LED,
  85. .mask = NIC78BX_USER2_LED_MASK,
  86. .cdev = {
  87. .name = "nilrt:green:user2",
  88. .max_brightness = 1,
  89. .brightness_set = nic78bx_brightness_set,
  90. .brightness_get = nic78bx_brightness_get,
  91. }
  92. },
  93. {
  94. .bit = NIC78BX_USER2_YELLOW_LED,
  95. .mask = NIC78BX_USER2_LED_MASK,
  96. .cdev = {
  97. .name = "nilrt:yellow:user2",
  98. .max_brightness = 1,
  99. .brightness_set = nic78bx_brightness_set,
  100. .brightness_get = nic78bx_brightness_get,
  101. }
  102. }
  103. };
  104. static int nic78bx_probe(struct platform_device *pdev)
  105. {
  106. struct device *dev = &pdev->dev;
  107. struct nic78bx_led_data *led_data;
  108. struct resource *io_rc;
  109. int ret, i;
  110. led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
  111. if (!led_data)
  112. return -ENOMEM;
  113. led_data->pdev = pdev;
  114. platform_set_drvdata(pdev, led_data);
  115. io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
  116. if (!io_rc) {
  117. dev_err(dev, "missing IO resources\n");
  118. return -EINVAL;
  119. }
  120. if (resource_size(io_rc) < NIC78BX_USER_LED_IO_SIZE) {
  121. dev_err(dev, "IO region too small\n");
  122. return -EINVAL;
  123. }
  124. if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),
  125. KBUILD_MODNAME)) {
  126. dev_err(dev, "failed to get IO region\n");
  127. return -EBUSY;
  128. }
  129. led_data->io_base = io_rc->start;
  130. spin_lock_init(&led_data->lock);
  131. for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) {
  132. nic78bx_leds[i].data = led_data;
  133. ret = devm_led_classdev_register(dev, &nic78bx_leds[i].cdev);
  134. if (ret)
  135. return ret;
  136. }
  137. /* Unlock LED register */
  138. outb(NIC78BX_UNLOCK_VALUE,
  139. led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
  140. return ret;
  141. }
  142. static int nic78bx_remove(struct platform_device *pdev)
  143. {
  144. struct nic78bx_led_data *led_data = platform_get_drvdata(pdev);
  145. /* Lock LED register */
  146. outb(NIC78BX_LOCK_VALUE,
  147. led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
  148. return 0;
  149. }
  150. static const struct acpi_device_id led_device_ids[] = {
  151. {"NIC78B3", 0},
  152. {"", 0},
  153. };
  154. MODULE_DEVICE_TABLE(acpi, led_device_ids);
  155. static struct platform_driver led_driver = {
  156. .probe = nic78bx_probe,
  157. .remove = nic78bx_remove,
  158. .driver = {
  159. .name = KBUILD_MODNAME,
  160. .acpi_match_table = ACPI_PTR(led_device_ids),
  161. },
  162. };
  163. module_platform_driver(led_driver);
  164. MODULE_DESCRIPTION("National Instruments PXI User LEDs driver");
  165. MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
  166. MODULE_LICENSE("GPL");