intel_chtdc_ti_pwrbtn.c 2.3 KB

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  1. /*
  2. * Power-button driver for Dollar Cove TI PMIC
  3. * Copyright (C) 2014 Intel Corp
  4. * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
  5. */
  6. #include <linux/input.h>
  7. #include <linux/interrupt.h>
  8. #include <linux/device.h>
  9. #include <linux/mfd/intel_soc_pmic.h>
  10. #include <linux/module.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/pm_wakeirq.h>
  13. #include <linux/slab.h>
  14. #define CHTDC_TI_SIRQ_REG 0x3
  15. #define SIRQ_PWRBTN_REL BIT(0)
  16. static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
  17. {
  18. struct input_dev *input = dev_id;
  19. struct device *dev = input->dev.parent;
  20. struct regmap *regmap = dev_get_drvdata(dev);
  21. int state;
  22. if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
  23. dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
  24. input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
  25. input_sync(input);
  26. }
  27. return IRQ_HANDLED;
  28. }
  29. static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
  30. {
  31. struct device *dev = &pdev->dev;
  32. struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
  33. struct input_dev *input;
  34. int irq, err;
  35. irq = platform_get_irq(pdev, 0);
  36. if (irq < 0)
  37. return irq;
  38. input = devm_input_allocate_device(dev);
  39. if (!input)
  40. return -ENOMEM;
  41. input->name = pdev->name;
  42. input->phys = "power-button/input0";
  43. input->id.bustype = BUS_HOST;
  44. input_set_capability(input, EV_KEY, KEY_POWER);
  45. err = input_register_device(input);
  46. if (err)
  47. return err;
  48. dev_set_drvdata(dev, pmic->regmap);
  49. err = devm_request_threaded_irq(dev, irq, NULL,
  50. chtdc_ti_pwrbtn_interrupt,
  51. 0, KBUILD_MODNAME, input);
  52. if (err)
  53. return err;
  54. device_init_wakeup(dev, true);
  55. dev_pm_set_wake_irq(dev, irq);
  56. return 0;
  57. }
  58. static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
  59. {
  60. dev_pm_clear_wake_irq(&pdev->dev);
  61. device_init_wakeup(&pdev->dev, false);
  62. return 0;
  63. }
  64. static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
  65. { .name = "chtdc_ti_pwrbtn" },
  66. {},
  67. };
  68. MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
  69. static struct platform_driver chtdc_ti_pwrbtn_driver = {
  70. .driver = {
  71. .name = KBUILD_MODNAME,
  72. },
  73. .probe = chtdc_ti_pwrbtn_probe,
  74. .remove = chtdc_ti_pwrbtn_remove,
  75. .id_table = chtdc_ti_pwrbtn_id_table,
  76. };
  77. module_platform_driver(chtdc_ti_pwrbtn_driver);
  78. MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
  79. MODULE_LICENSE("GPL v2");