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This provides a new input driver for supporting the power button on Basin Cove PMIC, found on Intel Merrifield-based devices. The driver follows the design used in intel_chtdc_ti_pwrbtn.c module. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Power-button driver for Basin Cove PMIC
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*
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* Copyright (c) 2019, Intel Corporation.
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*/
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/mfd/intel_soc_pmic.h>
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#include <linux/mfd/intel_soc_pmic_mrfld.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_wakeirq.h>
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#include <linux/slab.h>
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#define BCOVE_PBSTATUS 0x27
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#define BCOVE_PBSTATUS_PBLVL BIT(4) /* 1 - release, 0 - press */
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static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
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{
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struct input_dev *input = dev_id;
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struct device *dev = input->dev.parent;
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struct regmap *regmap = dev_get_drvdata(dev);
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unsigned int state;
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int ret;
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ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
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if (ret)
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return IRQ_NONE;
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dev_dbg(dev, "PBSTATUS=0x%x\n", state);
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input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
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input_sync(input);
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regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
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return IRQ_HANDLED;
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}
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static int mrfld_pwrbtn_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
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struct input_dev *input;
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int irq, ret;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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input->name = pdev->name;
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input->phys = "power-button/input0";
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input->id.bustype = BUS_HOST;
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input->dev.parent = dev;
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input_set_capability(input, EV_KEY, KEY_POWER);
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ret = input_register_device(input);
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if (ret)
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return ret;
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dev_set_drvdata(dev, pmic->regmap);
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ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
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IRQF_ONESHOT | IRQF_SHARED, pdev->name,
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input);
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if (ret)
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return ret;
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regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
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regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
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device_init_wakeup(dev, true);
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dev_pm_set_wake_irq(dev, irq);
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return 0;
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}
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static int mrfld_pwrbtn_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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dev_pm_clear_wake_irq(dev);
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device_init_wakeup(dev, false);
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return 0;
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}
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static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
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{ .name = "mrfld_bcove_pwrbtn" },
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{}
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};
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MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
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static struct platform_driver mrfld_pwrbtn_driver = {
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.driver = {
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.name = "mrfld_bcove_pwrbtn",
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},
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.probe = mrfld_pwrbtn_probe,
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.remove = mrfld_pwrbtn_remove,
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.id_table = mrfld_pwrbtn_id_table,
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};
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module_platform_driver(mrfld_pwrbtn_driver);
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MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
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MODULE_LICENSE("GPL v2");
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