projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d999718 SR |
1 | /** |
| 2 | * CPCAP Power Button Input Driver | |
| 3 | * | |
| 4 | * Copyright (C) 2017 Sebastian Reichel <sre@kernel.org> | |
| 5 | * | |
| 6 | * This file is subject to the terms and conditions of the GNU General | |
| 7 | * Public License. See the file "COPYING" in the main directory of this | |
| 8 | * archive for more details. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/init.h> | |
| 18 | #include <linux/kernel.h> | |
| 19 | #include <linux/errno.h> | |
| 20 | #include <linux/input.h> | |
| 21 | #include <linux/interrupt.h> | |
| 22 | #include <linux/regmap.h> | |
| 23 | #include <linux/of.h> | |
| 24 | #include <linux/platform_device.h> | |
| 25 | #include <linux/mfd/motorola-cpcap.h> | |
| 26 | ||
| 27 | #define CPCAP_IRQ_ON 23 | |
| 28 | #define CPCAP_IRQ_ON_BITMASK (1 << (CPCAP_IRQ_ON % 16)) | |
| 29 | ||
| 30 | struct cpcap_power_button { | |
| 31 | struct regmap *regmap; | |
| 32 | struct input_dev *idev; | |
| 33 | struct device *dev; | |
| 34 | }; | |
| 35 | ||
| 36 | static irqreturn_t powerbutton_irq(int irq, void *_button) | |
| 37 | { | |
| 38 | struct cpcap_power_button *button = _button; | |
| 39 | int val; | |
| 40 | ||
| 41 | val = cpcap_sense_virq(button->regmap, irq); | |
| 42 | if (val < 0) { | |
| 43 | dev_err(button->dev, "irq read failed: %d", val); | |
| 44 | return IRQ_HANDLED; | |
| 45 | } | |
| 46 | ||
| 47 | pm_wakeup_event(button->dev, 0); | |
| 48 | input_report_key(button->idev, KEY_POWER, val); | |
| 49 | input_sync(button->idev); | |
| 50 | ||
| 51 | return IRQ_HANDLED; | |
| 52 | } | |
| 53 | ||
| 54 | static int cpcap_power_button_probe(struct platform_device *pdev) | |
| 55 | { | |
| 56 | struct cpcap_power_button *button; | |
| 57 | int irq = platform_get_irq(pdev, 0); | |
| 58 | int err; | |
| 59 | ||
| 60 | button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL); | |
| 61 | if (!button) | |
| 62 | return -ENOMEM; | |
| 63 | ||
| 64 | button->idev = devm_input_allocate_device(&pdev->dev); | |
| 65 | if (!button->idev) | |
| 66 | return -ENOMEM; | |
| 67 | ||
| 68 | button->regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
| 69 | if (!button->regmap) | |
| 70 | return -ENODEV; | |
| 71 | ||
| 72 | button->dev = &pdev->dev; | |
| 73 | ||
| 74 | button->idev->name = "cpcap-pwrbutton"; | |
| 75 | button->idev->phys = "cpcap-pwrbutton/input0"; | |
| 76 | button->idev->dev.parent = button->dev; | |
| 77 | input_set_capability(button->idev, EV_KEY, KEY_POWER); | |
| 78 | ||
| 79 | err = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
| 80 | powerbutton_irq, IRQF_ONESHOT, "cpcap_pwrbutton", button); | |
| 81 | if (err < 0) { | |
| 82 | dev_err(&pdev->dev, "IRQ request failed: %d\n", err); | |
| 83 | return err; | |
| 84 | } | |
| 85 | ||
| 86 | err = input_register_device(button->idev); | |
| 87 | if (err) { | |
| 88 | dev_err(&pdev->dev, "Input register failed: %d\n", err); | |
| 89 | return err; | |
| 90 | } | |
| 91 | ||
| 92 | device_init_wakeup(&pdev->dev, true); | |
| 93 | ||
| 94 | return 0; | |
| 95 | } | |
| 96 | ||
| 97 | #ifdef CONFIG_OF | |
| 98 | static const struct of_device_id cpcap_pwrbutton_dt_match_table[] = { | |
| 99 | { .compatible = "motorola,cpcap-pwrbutton" }, | |
| 100 | {}, | |
| 101 | }; | |
| 102 | MODULE_DEVICE_TABLE(of, cpcap_pwrbutton_dt_match_table); | |
| 103 | #endif | |
| 104 | ||
| 105 | static struct platform_driver cpcap_power_button_driver = { | |
| 106 | .probe = cpcap_power_button_probe, | |
| 107 | .driver = { | |
| 108 | .name = "cpcap-pwrbutton", | |
| 109 | .of_match_table = of_match_ptr(cpcap_pwrbutton_dt_match_table), | |
| 110 | }, | |
| 111 | }; | |
| 112 | module_platform_driver(cpcap_power_button_driver); | |
| 113 | ||
| 114 | MODULE_ALIAS("platform:cpcap-pwrbutton"); | |
| 115 | MODULE_DESCRIPTION("CPCAP Power Button"); | |
| 116 | MODULE_LICENSE("GPL"); | |
| 117 | MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); |