intel_chtdc_ti_pwrbtn.c 2.3 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Power-button driver for Dollar Cove TI PMIC
  4. * Copyright (C) 2014 Intel Corp
  5. * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
  6. */
  7. #include <linux/input.h>
  8. #include <linux/interrupt.h>
  9. #include <linux/device.h>
  10. #include <linux/mfd/intel_soc_pmic.h>
  11. #include <linux/module.h>
  12. #include <linux/platform_device.h>
  13. #include <linux/pm_wakeirq.h>
  14. #include <linux/slab.h>
  15. #define CHTDC_TI_SIRQ_REG 0x3
  16. #define SIRQ_PWRBTN_REL BIT(0)
  17. static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
  18. {
  19. struct input_dev *input = dev_id;
  20. struct device *dev = input->dev.parent;
  21. struct regmap *regmap = dev_get_drvdata(dev);
  22. int state;
  23. if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
  24. dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
  25. input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
  26. input_sync(input);
  27. }
  28. return IRQ_HANDLED;
  29. }
  30. static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
  31. {
  32. struct device *dev = &pdev->dev;
  33. struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
  34. struct input_dev *input;
  35. int irq, err;
  36. irq = platform_get_irq(pdev, 0);
  37. if (irq < 0)
  38. return irq;
  39. input = devm_input_allocate_device(dev);
  40. if (!input)
  41. return -ENOMEM;
  42. input->name = pdev->name;
  43. input->phys = "power-button/input0";
  44. input->id.bustype = BUS_HOST;
  45. input_set_capability(input, EV_KEY, KEY_POWER);
  46. err = input_register_device(input);
  47. if (err)
  48. return err;
  49. dev_set_drvdata(dev, pmic->regmap);
  50. err = devm_request_threaded_irq(dev, irq, NULL,
  51. chtdc_ti_pwrbtn_interrupt,
  52. 0, KBUILD_MODNAME, input);
  53. if (err)
  54. return err;
  55. device_init_wakeup(dev, true);
  56. dev_pm_set_wake_irq(dev, irq);
  57. return 0;
  58. }
  59. static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
  60. {
  61. dev_pm_clear_wake_irq(&pdev->dev);
  62. device_init_wakeup(&pdev->dev, false);
  63. return 0;
  64. }
  65. static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
  66. { .name = "chtdc_ti_pwrbtn" },
  67. {},
  68. };
  69. MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
  70. static struct platform_driver chtdc_ti_pwrbtn_driver = {
  71. .driver = {
  72. .name = KBUILD_MODNAME,
  73. },
  74. .probe = chtdc_ti_pwrbtn_probe,
  75. .remove = chtdc_ti_pwrbtn_remove,
  76. .id_table = chtdc_ti_pwrbtn_id_table,
  77. };
  78. module_platform_driver(chtdc_ti_pwrbtn_driver);
  79. MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
  80. MODULE_LICENSE("GPL v2");