x86/intel/mrfld_pwrbtn.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Power-button driver for Basin Cove PMIC
0004  *
0005  * Copyright (c) 2019, Intel Corporation.
0006  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
0007  */
0008
0009 #include <linux/input.h>
0010 #include <linux/interrupt.h>
0011 #include <linux/device.h>
0012 #include <linux/mfd/intel_soc_pmic.h>
0013 #include <linux/mfd/intel_soc_pmic_mrfld.h>
0014 #include <linux/module.h>
0015 #include <linux/platform_device.h>
0016 #include <linux/pm_wakeirq.h>
0017 #include <linux/slab.h>
0018
0019 #define BCOVE_PBSTATUS      0x27
0020 #define BCOVE_PBSTATUS_PBLVL    BIT(4)  /* 1 - release, 0 - press */
0021
0022 static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
0023 {
0024     struct input_dev *input = dev_id;
0025     struct device *dev = input->dev.parent;
0026     struct regmap *regmap = dev_get_drvdata(dev);
0027     unsigned int state;
0028     int ret;
0029
0030     ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
0031     if (ret)
0032         return IRQ_NONE;
0033
0034     dev_dbg(dev, "PBSTATUS=0x%x\n", state);
0035     input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
0036     input_sync(input);
0037
0038     regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
0039     return IRQ_HANDLED;
0040 }
0041
0042 static int mrfld_pwrbtn_probe(struct platform_device *pdev)
0043 {
0044     struct device *dev = &pdev->dev;
0045     struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
0046     struct input_dev *input;
0047     int irq, ret;
0048
0049     irq = platform_get_irq(pdev, 0);
0050     if (irq < 0)
0051         return irq;
0052
0053     input = devm_input_allocate_device(dev);
0054     if (!input)
0055         return -ENOMEM;
0056     input->name = pdev->name;
0057     input->phys = "power-button/input0";
0058     input->id.bustype = BUS_HOST;
0059     input->dev.parent = dev;
0060     input_set_capability(input, EV_KEY, KEY_POWER);
0061     ret = input_register_device(input);
0062     if (ret)
0063         return ret;
0064
0065     dev_set_drvdata(dev, pmic->regmap);
0066
0067     ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
0068                     IRQF_ONESHOT | IRQF_SHARED, pdev->name,
0069                     input);
0070     if (ret)
0071         return ret;
0072
0073     regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
0074     regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
0075
0076     device_init_wakeup(dev, true);
0077     dev_pm_set_wake_irq(dev, irq);
0078     return 0;
0079 }
0080
0081 static int mrfld_pwrbtn_remove(struct platform_device *pdev)
0082 {
0083     struct device *dev = &pdev->dev;
0084
0085     dev_pm_clear_wake_irq(dev);
0086     device_init_wakeup(dev, false);
0087     return 0;
0088 }
0089
0090 static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
0091     { .name = "mrfld_bcove_pwrbtn" },
0092     {}
0093 };
0094 MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
0095
0096 static struct platform_driver mrfld_pwrbtn_driver = {
0097     .driver = {
0098         .name   = "mrfld_bcove_pwrbtn",
0099     },
0100     .probe      = mrfld_pwrbtn_probe,
0101     .remove     = mrfld_pwrbtn_remove,
0102     .id_table   = mrfld_pwrbtn_id_table,
0103 };
0104 module_platform_driver(mrfld_pwrbtn_driver);
0105
0106 MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
0107 MODULE_LICENSE("GPL v2");