Markus Schneider-Pargmann | c8cf6e2 | 2022-11-04 16:23:10 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // |
| 3 | // Driver for TPS65219 Push Button |
| 4 | // |
| 5 | // Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/ |
| 6 | |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/input.h> |
| 9 | #include <linux/interrupt.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/mfd/tps65219.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/regmap.h> |
| 16 | #include <linux/slab.h> |
| 17 | |
| 18 | struct tps65219_pwrbutton { |
| 19 | struct device *dev; |
| 20 | struct input_dev *idev; |
| 21 | char phys[32]; |
| 22 | }; |
| 23 | |
| 24 | static irqreturn_t tps65219_pb_push_irq(int irq, void *_pwr) |
| 25 | { |
| 26 | struct tps65219_pwrbutton *pwr = _pwr; |
| 27 | |
| 28 | input_report_key(pwr->idev, KEY_POWER, 1); |
| 29 | pm_wakeup_event(pwr->dev, 0); |
| 30 | input_sync(pwr->idev); |
| 31 | |
| 32 | return IRQ_HANDLED; |
| 33 | } |
| 34 | |
| 35 | static irqreturn_t tps65219_pb_release_irq(int irq, void *_pwr) |
| 36 | { |
| 37 | struct tps65219_pwrbutton *pwr = _pwr; |
| 38 | |
| 39 | input_report_key(pwr->idev, KEY_POWER, 0); |
| 40 | input_sync(pwr->idev); |
| 41 | |
| 42 | return IRQ_HANDLED; |
| 43 | } |
| 44 | |
| 45 | static int tps65219_pb_probe(struct platform_device *pdev) |
| 46 | { |
| 47 | struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent); |
| 48 | struct device *dev = &pdev->dev; |
| 49 | struct tps65219_pwrbutton *pwr; |
| 50 | struct input_dev *idev; |
| 51 | int error; |
| 52 | int push_irq; |
| 53 | int release_irq; |
| 54 | |
| 55 | pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL); |
| 56 | if (!pwr) |
| 57 | return -ENOMEM; |
| 58 | |
| 59 | idev = devm_input_allocate_device(dev); |
| 60 | if (!idev) |
| 61 | return -ENOMEM; |
| 62 | |
| 63 | idev->name = pdev->name; |
| 64 | snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0", |
| 65 | pdev->name); |
| 66 | idev->phys = pwr->phys; |
| 67 | idev->id.bustype = BUS_I2C; |
| 68 | |
| 69 | input_set_capability(idev, EV_KEY, KEY_POWER); |
| 70 | |
| 71 | pwr->dev = dev; |
| 72 | pwr->idev = idev; |
| 73 | device_init_wakeup(dev, true); |
| 74 | |
| 75 | push_irq = platform_get_irq(pdev, 0); |
| 76 | if (push_irq < 0) |
| 77 | return -EINVAL; |
| 78 | |
| 79 | release_irq = platform_get_irq(pdev, 1); |
| 80 | if (release_irq < 0) |
| 81 | return -EINVAL; |
| 82 | |
| 83 | error = devm_request_threaded_irq(dev, push_irq, NULL, |
| 84 | tps65219_pb_push_irq, |
| 85 | IRQF_ONESHOT, |
| 86 | dev->init_name, pwr); |
| 87 | if (error) { |
| 88 | dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq, |
| 89 | error); |
| 90 | return error; |
| 91 | } |
| 92 | |
| 93 | error = devm_request_threaded_irq(dev, release_irq, NULL, |
| 94 | tps65219_pb_release_irq, |
| 95 | IRQF_ONESHOT, |
| 96 | dev->init_name, pwr); |
| 97 | if (error) { |
| 98 | dev_err(dev, "failed to request release IRQ #%d: %d\n", |
| 99 | release_irq, error); |
| 100 | return error; |
| 101 | } |
| 102 | |
| 103 | error = input_register_device(idev); |
| 104 | if (error) { |
| 105 | dev_err(dev, "Can't register power button: %d\n", error); |
| 106 | return error; |
| 107 | } |
| 108 | |
| 109 | /* Enable interrupts for the pushbutton */ |
| 110 | regmap_clear_bits(tps->regmap, TPS65219_REG_MASK_CONFIG, |
| 111 | TPS65219_REG_MASK_INT_FOR_PB_MASK); |
| 112 | |
| 113 | /* Set PB/EN/VSENSE pin to be a pushbutton */ |
| 114 | regmap_update_bits(tps->regmap, TPS65219_REG_MFP_2_CONFIG, |
| 115 | TPS65219_MFP_2_EN_PB_VSENSE_MASK, TPS65219_MFP_2_PB); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
Uwe Kleine-König | ab892b7 | 2023-06-06 10:27:24 -0700 | [diff] [blame] | 120 | static void tps65219_pb_remove(struct platform_device *pdev) |
Markus Schneider-Pargmann | c8cf6e2 | 2022-11-04 16:23:10 +0100 | [diff] [blame] | 121 | { |
| 122 | struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent); |
Uwe Kleine-König | ab892b7 | 2023-06-06 10:27:24 -0700 | [diff] [blame] | 123 | int ret; |
Markus Schneider-Pargmann | c8cf6e2 | 2022-11-04 16:23:10 +0100 | [diff] [blame] | 124 | |
| 125 | /* Disable interrupt for the pushbutton */ |
Uwe Kleine-König | d9f12a3 | 2023-06-06 10:42:36 -0700 | [diff] [blame] | 126 | ret = regmap_set_bits(tps->regmap, TPS65219_REG_MASK_CONFIG, |
| 127 | TPS65219_REG_MASK_INT_FOR_PB_MASK); |
Uwe Kleine-König | ab892b7 | 2023-06-06 10:27:24 -0700 | [diff] [blame] | 128 | if (ret) |
| 129 | dev_warn(&pdev->dev, "Failed to disable irq (%pe)\n", ERR_PTR(ret)); |
Markus Schneider-Pargmann | c8cf6e2 | 2022-11-04 16:23:10 +0100 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static const struct platform_device_id tps65219_pwrbtn_id_table[] = { |
| 133 | { "tps65219-pwrbutton", }, |
| 134 | { /* sentinel */ } |
| 135 | }; |
| 136 | MODULE_DEVICE_TABLE(platform, tps65219_pwrbtn_id_table); |
| 137 | |
| 138 | static struct platform_driver tps65219_pb_driver = { |
| 139 | .probe = tps65219_pb_probe, |
Uwe Kleine-König | ab892b7 | 2023-06-06 10:27:24 -0700 | [diff] [blame] | 140 | .remove_new = tps65219_pb_remove, |
Markus Schneider-Pargmann | c8cf6e2 | 2022-11-04 16:23:10 +0100 | [diff] [blame] | 141 | .driver = { |
| 142 | .name = "tps65219_pwrbutton", |
| 143 | }, |
| 144 | .id_table = tps65219_pwrbtn_id_table, |
| 145 | }; |
| 146 | module_platform_driver(tps65219_pb_driver); |
| 147 | |
| 148 | MODULE_DESCRIPTION("TPS65219 Power Button"); |
| 149 | MODULE_LICENSE("GPL"); |
| 150 | MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com"); |