x86/intel/chtdc_ti_pwrbtn.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Power-button driver for Dollar Cove TI PMIC
0004  * Copyright (C) 2014 Intel Corp
0005  * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
0006  */
0007
0008 #include <linux/input.h>
0009 #include <linux/interrupt.h>
0010 #include <linux/device.h>
0011 #include <linux/mfd/intel_soc_pmic.h>
0012 #include <linux/module.h>
0013 #include <linux/platform_device.h>
0014 #include <linux/pm_wakeirq.h>
0015 #include <linux/slab.h>
0016
0017 #define CHTDC_TI_SIRQ_REG   0x3
0018 #define SIRQ_PWRBTN_REL     BIT(0)
0019
0020 static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
0021 {
0022     struct input_dev *input = dev_id;
0023     struct device *dev = input->dev.parent;
0024     struct regmap *regmap = dev_get_drvdata(dev);
0025     int state;
0026
0027     if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
0028         dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
0029         input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
0030         input_sync(input);
0031     }
0032
0033     return IRQ_HANDLED;
0034 }
0035
0036 static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
0037 {
0038     struct device *dev = &pdev->dev;
0039     struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
0040     struct input_dev *input;
0041     int irq, err;
0042
0043     irq = platform_get_irq(pdev, 0);
0044     if (irq < 0)
0045         return irq;
0046     input = devm_input_allocate_device(dev);
0047     if (!input)
0048         return -ENOMEM;
0049     input->name = pdev->name;
0050     input->phys = "power-button/input0";
0051     input->id.bustype = BUS_HOST;
0052     input_set_capability(input, EV_KEY, KEY_POWER);
0053     err = input_register_device(input);
0054     if (err)
0055         return err;
0056
0057     dev_set_drvdata(dev, pmic->regmap);
0058
0059     err = devm_request_threaded_irq(dev, irq, NULL,
0060                     chtdc_ti_pwrbtn_interrupt,
0061                     IRQF_ONESHOT, KBUILD_MODNAME, input);
0062     if (err)
0063         return err;
0064
0065     device_init_wakeup(dev, true);
0066     dev_pm_set_wake_irq(dev, irq);
0067     return 0;
0068 }
0069
0070 static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
0071 {
0072     dev_pm_clear_wake_irq(&pdev->dev);
0073     device_init_wakeup(&pdev->dev, false);
0074     return 0;
0075 }
0076
0077 static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
0078     { .name = "chtdc_ti_pwrbtn" },
0079     {},
0080 };
0081 MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
0082
0083 static struct platform_driver chtdc_ti_pwrbtn_driver = {
0084     .driver = {
0085         .name   = KBUILD_MODNAME,
0086     },
0087     .probe      = chtdc_ti_pwrbtn_probe,
0088     .remove     = chtdc_ti_pwrbtn_remove,
0089     .id_table   = chtdc_ti_pwrbtn_id_table,
0090 };
0091 module_platform_driver(chtdc_ti_pwrbtn_driver);
0092
0093 MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
0094 MODULE_LICENSE("GPL v2");