gpio-clps711x.c 1.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * CLPS711X GPIO driver
  4. *
  5. * Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
  6. */
  7. #include <linux/err.h>
  8. #include <linux/module.h>
  9. #include <linux/gpio/driver.h>
  10. #include <linux/platform_device.h>
  11. static int clps711x_gpio_probe(struct platform_device *pdev)
  12. {
  13. struct device_node *np = pdev->dev.of_node;
  14. void __iomem *dat, *dir;
  15. struct gpio_chip *gc;
  16. int err, id;
  17. if (!np)
  18. return -ENODEV;
  19. id = of_alias_get_id(np, "gpio");
  20. if ((id < 0) || (id > 4))
  21. return -ENODEV;
  22. gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
  23. if (!gc)
  24. return -ENOMEM;
  25. dat = devm_platform_ioremap_resource(pdev, 0);
  26. if (IS_ERR(dat))
  27. return PTR_ERR(dat);
  28. dir = devm_platform_ioremap_resource(pdev, 1);
  29. if (IS_ERR(dir))
  30. return PTR_ERR(dir);
  31. switch (id) {
  32. case 3:
  33. /* PORTD is inverted logic for direction register */
  34. err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  35. NULL, dir, 0);
  36. break;
  37. default:
  38. err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
  39. dir, NULL, 0);
  40. break;
  41. }
  42. if (err)
  43. return err;
  44. switch (id) {
  45. case 4:
  46. /* PORTE is 3 lines only */
  47. gc->ngpio = 3;
  48. break;
  49. default:
  50. break;
  51. }
  52. gc->base = -1;
  53. gc->owner = THIS_MODULE;
  54. platform_set_drvdata(pdev, gc);
  55. return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
  56. }
  57. static const struct of_device_id __maybe_unused clps711x_gpio_ids[] = {
  58. { .compatible = "cirrus,ep7209-gpio" },
  59. { }
  60. };
  61. MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
  62. static struct platform_driver clps711x_gpio_driver = {
  63. .driver = {
  64. .name = "clps711x-gpio",
  65. .of_match_table = of_match_ptr(clps711x_gpio_ids),
  66. },
  67. .probe = clps711x_gpio_probe,
  68. };
  69. module_platform_driver(clps711x_gpio_driver);
  70. MODULE_LICENSE("GPL");
  71. MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
  72. MODULE_DESCRIPTION("CLPS711X GPIO driver");
  73. MODULE_ALIAS("platform:clps711x-gpio");