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platform/x86: Add support for Basin Cove power button

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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>
This commit is contained in:
Andy Shevchenko 2019-03-19 12:59:56 +02:00
parent 487579bab8
commit 6456fd7315
3 changed files with 119 additions and 0 deletions
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11
drivers/platform/x86/Kconfig
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@ -1263,6 +1263,17 @@ config INTEL_CHTDC_TI_PWRBTN
To compile this driver as a module, choose M here: the module
will be called intel_chtdc_ti_pwrbtn.
config INTEL_MRFLD_PWRBTN
tristate "Intel Merrifield Basin Cove power button driver"
depends on INTEL_SOC_PMIC_MRFLD
depends on INPUT
---help---
This option adds a power button driver for Basin Cove PMIC
on Intel Merrifield devices.
To compile this driver as a module, choose M here: the module
will be called intel_mrfld_pwrbtn.
config I2C_MULTI_INSTANTIATE
tristate "I2C multi instantiate pseudo device driver"
depends on I2C && ACPI

1
drivers/platform/x86/Makefile
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@ -94,6 +94,7 @@ obj-$(CONFIG_PMC_ATOM) += pmc_atom.o
obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN) += intel_chtdc_ti_pwrbtn.o
obj-$(CONFIG_INTEL_MRFLD_PWRBTN) += intel_mrfld_pwrbtn.o
obj-$(CONFIG_I2C_MULTI_INSTANTIATE) += i2c-multi-instantiate.o
obj-$(CONFIG_INTEL_ATOMISP2_PM) += intel_atomisp2_pm.o
obj-$(CONFIG_PCENGINES_APU2) += pcengines-apuv2.o

107
drivers/platform/x86/intel_mrfld_pwrbtn.c Normal file
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@ -0,0 +1,107 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Power-button driver for Basin Cove PMIC
*
* Copyright (c) 2019, Intel Corporation.
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*/
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/mfd/intel_soc_pmic_mrfld.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>
#define BCOVE_PBSTATUS 0x27
#define BCOVE_PBSTATUS_PBLVL BIT(4) /* 1 - release, 0 - press */
static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
{
struct input_dev *input = dev_id;
struct device *dev = input->dev.parent;
struct regmap *regmap = dev_get_drvdata(dev);
unsigned int state;
int ret;
ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
if (ret)
return IRQ_NONE;
dev_dbg(dev, "PBSTATUS=0x%x\n", state);
input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
input_sync(input);
regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
return IRQ_HANDLED;
}
static int mrfld_pwrbtn_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
struct input_dev *input;
int irq, ret;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
input->name = pdev->name;
input->phys = "power-button/input0";
input->id.bustype = BUS_HOST;
input->dev.parent = dev;
input_set_capability(input, EV_KEY, KEY_POWER);
ret = input_register_device(input);
if (ret)
return ret;
dev_set_drvdata(dev, pmic->regmap);
ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
IRQF_ONESHOT | IRQF_SHARED, pdev->name,
input);
if (ret)
return ret;
regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
device_init_wakeup(dev, true);
dev_pm_set_wake_irq(dev, irq);
return 0;
}
static int mrfld_pwrbtn_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
dev_pm_clear_wake_irq(dev);
device_init_wakeup(dev, false);
return 0;
}
static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
{ .name = "mrfld_bcove_pwrbtn" },
{}
};
MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
static struct platform_driver mrfld_pwrbtn_driver = {
.driver = {
.name = "mrfld_bcove_pwrbtn",
},
.probe = mrfld_pwrbtn_probe,
.remove = mrfld_pwrbtn_remove,
.id_table = mrfld_pwrbtn_id_table,
};
module_platform_driver(mrfld_pwrbtn_driver);
MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
MODULE_LICENSE("GPL v2");