Release 4.7 drivers/platform/x86/intel_mid_powerbtn.c

/*
 * Power button driver for Medfield.
 *
 * Copyright (C) 2010 Intel Corp
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/mfd/intel_msic.h>
#include <linux/pm_wakeirq.h>


#define DRIVER_NAME "msic_power_btn"


#define MSIC_PB_LEVEL	(1 << 3) 
/* 1 - release, 0 - press */

/*
 * MSIC document ti_datasheet defines the 1st bit reg 0x21 is used to mask
 * power button interrupt
 */

#define MSIC_PWRBTNM    (1 << 0)



static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
{
	struct input_dev *input = dev_id;
	int ret;
	u8 pbstat;

	ret = intel_msic_reg_read(INTEL_MSIC_PBSTATUS, &pbstat);
	dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat);

	if (ret < 0) {
		dev_err(input->dev.parent, "Read error %d while reading"
			       " MSIC_PB_STATUS\n", ret);
	} else {
		input_event(input, EV_KEY, KEY_POWER,
			       !(pbstat & MSIC_PB_LEVEL));
		input_sync(input);
	}

	return IRQ_HANDLED;
}

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hong liu
hong liu
62
63.27%
1
33.33%
ameya palande
ameya palande
21
21.43%
1
33.33%
michael demeter
michael demeter
15
15.31%
1
33.33%
Total
98
100.00%
3
100.00%



static int mfld_pb_probe(struct platform_device *pdev)
{
	struct input_dev *input;
	int irq = platform_get_irq(pdev, 0);
	int error;

	if (irq < 0)
		return -EINVAL;

	input = input_allocate_device();
	if (!input)
		return -ENOMEM;

	input->name = pdev->name;
	input->phys = "power-button/input0";
	input->id.bustype = BUS_HOST;
	input->dev.parent = &pdev->dev;

	input_set_capability(input, EV_KEY, KEY_POWER);

	error = request_threaded_irq(irq, NULL, mfld_pb_isr, 0,
				     DRIVER_NAME, input);
	if (error) {
		dev_err(&pdev->dev, "Unable to request irq %d for mfld power"
				"button\n", irq);
		goto err_free_input;
	}

	device_init_wakeup(&pdev->dev, true);
	dev_pm_set_wake_irq(&pdev->dev, irq);

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev, "Unable to register input dev, error "
				"%d\n", error);
		goto err_free_irq;
	}

	platform_set_drvdata(pdev, input);

	/*
         * SCU firmware might send power button interrupts to IA core before
         * kernel boots and doesn't get EOI from IA core. The first bit of
         * MSIC reg 0x21 is kept masked, and SCU firmware doesn't send new
         * power interrupt to Android kernel. Unmask the bit when probing
         * power button in kernel.
         * There is a very narrow race between irq handler and power button
         * initialization. The race happens rarely. So we needn't worry
         * about it.
         */
	error = intel_msic_reg_update(INTEL_MSIC_IRQLVL1MSK, 0, MSIC_PWRBTNM);
	if (error) {
		dev_err(&pdev->dev, "Unable to clear power button interrupt, "
				"error: %d\n", error);
		goto err_free_irq;
	}

	return 0;

err_free_irq:
	free_irq(irq, input);
err_free_input:
	input_free_device(input);
	return error;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hong liu
hong liu
175
71.14%
1
25.00%
michael demeter
michael demeter
34
13.82%
1
25.00%
sudeep holla
sudeep holla
21
8.54%
1
25.00%
ameya palande
ameya palande
16
6.50%
1
25.00%
Total
246
100.00%
4
100.00%



static int mfld_pb_remove(struct platform_device *pdev)
{
	struct input_dev *input = platform_get_drvdata(pdev);
	int irq = platform_get_irq(pdev, 0);

	dev_pm_clear_wake_irq(&pdev->dev);
	device_init_wakeup(&pdev->dev, false);
	free_irq(irq, input);
	input_unregister_device(input);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hong liu
hong liu
33
51.56%
1
33.33%
sudeep holla
sudeep holla
18
28.12%
1
33.33%
ameya palande
ameya palande
13
20.31%
1
33.33%
Total
64
100.00%
3
100.00%


static struct platform_driver mfld_pb_driver = {
	.driver = {
		.name = DRIVER_NAME,
        },
	.probe	= mfld_pb_probe,
	.remove	= mfld_pb_remove,
};


module_platform_driver(mfld_pb_driver);

MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
hong liu
hong liu
352
70.40%
1
20.00%
michael demeter
michael demeter
55
11.00%
1
20.00%
ameya palande
ameya palande
50
10.00%
1
20.00%
sudeep holla
sudeep holla
42
8.40%
1
20.00%
axel lin
axel lin
1
0.20%
1
20.00%
Total
500
100.00%
5
100.00%
  
Directory: drivers/platform/x86

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