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/*
* Power button driver for Intel MID platforms.
*
* Copyright (C) 2010,2017 Intel Corp
*
* Author: Hong Liu <hong.liu@intel.com>
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*
* 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.
*/
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/intel_msic.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/intel_scu_ipc.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)
/* Intel Tangier */
#define BCOVE_PB_LEVEL (1 << 4) /* 1 - release, 0 - press */
/* Basin Cove PMIC */
#define BCOVE_PBIRQ 0x02
#define BCOVE_IRQLVL1MSK 0x0c
#define BCOVE_PBIRQMASK 0x0d
#define BCOVE_PBSTATUS 0x27
struct mid_pb_ddata {
struct device *dev;
int irq;
struct input_dev *input;
unsigned short mirqlvl1_addr;
unsigned short pbstat_addr;
u8 pbstat_mask;
int (*setup)(struct mid_pb_ddata *ddata);
};
static int mid_pbstat(struct mid_pb_ddata *ddata, int *value)
{
struct input_dev *input = ddata->input;
int ret;
u8 pbstat;
ret = intel_scu_ipc_ioread8(ddata->pbstat_addr, &pbstat);
if (ret)
return ret;
dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat);
*value = !(pbstat & ddata->pbstat_mask);
return 0;
}
static int mid_irq_ack(struct mid_pb_ddata *ddata)
{
return intel_scu_ipc_update_register(ddata->mirqlvl1_addr, 0, MSIC_PWRBTNM);
}
static int mrfld_setup(struct mid_pb_ddata *ddata)
{
/* Unmask the PBIRQ and MPBIRQ on Tangier */
intel_scu_ipc_update_register(BCOVE_PBIRQ, 0, MSIC_PWRBTNM);
intel_scu_ipc_update_register(BCOVE_PBIRQMASK, 0, MSIC_PWRBTNM);
return 0;
}
static irqreturn_t mid_pb_isr(int irq, void *dev_id)
{
struct mid_pb_ddata *ddata = dev_id;
struct input_dev *input = ddata->input;
int value = 0;
int ret;
ret = mid_pbstat(ddata, &value);
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, value);
input_sync(input);
}
mid_irq_ack(ddata);
return IRQ_HANDLED;
}
static struct mid_pb_ddata mfld_ddata = {
.mirqlvl1_addr = INTEL_MSIC_IRQLVL1MSK,
.pbstat_addr = INTEL_MSIC_PBSTATUS,
.pbstat_mask = MSIC_PB_LEVEL,
};
static struct mid_pb_ddata mrfld_ddata = {
.mirqlvl1_addr = BCOVE_IRQLVL1MSK,
.pbstat_addr = BCOVE_PBSTATUS,
.pbstat_mask = BCOVE_PB_LEVEL,
.setup = mrfld_setup,
};
#define ICPU(model, ddata) \
{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (kernel_ulong_t)&ddata }
static const struct x86_cpu_id mid_pb_cpu_ids[] = {
ICPU(INTEL_FAM6_ATOM_PENWELL, mfld_ddata),
ICPU(INTEL_FAM6_ATOM_MERRIFIELD, mrfld_ddata),
{}
};
static int mid_pb_probe(struct platform_device *pdev)
{
const struct x86_cpu_id *id;
struct mid_pb_ddata *ddata;
struct input_dev *input;
int irq = platform_get_irq(pdev, 0);
int error;
id = x86_match_cpu(mid_pb_cpu_ids);
if (!id)
return -ENODEV;
if (irq < 0)
return -EINVAL;
input = devm_input_allocate_device(&pdev->dev);
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);
ddata = (struct mid_pb_ddata *)id->driver_data;
if (!ddata)
return -ENODATA;
ddata->dev = &pdev->dev;
ddata->irq = irq;
ddata->input = input;
if (ddata->setup) {
error = ddata->setup(ddata);
if (error)
return error;
}
error = devm_request_threaded_irq(&pdev->dev, irq, NULL, mid_pb_isr,
IRQF_ONESHOT, DRIVER_NAME, ddata);
if (error) {
dev_err(&pdev->dev,
"Unable to request irq %d for MID power button\n", irq);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev,
"Unable to register input dev, error %d\n", error);
return error;
}
platform_set_drvdata(pdev, ddata);
/*
* 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 = mid_irq_ack(ddata);
if (error) {
dev_err(&pdev->dev,
"Unable to clear power button interrupt, error: %d\n",
error);
return error;
}
device_init_wakeup(&pdev->dev, true);
dev_pm_set_wake_irq(&pdev->dev, irq);
return 0;
}
static int mid_pb_remove(struct platform_device *pdev)
{
dev_pm_clear_wake_irq(&pdev->dev);
device_init_wakeup(&pdev->dev, false);
return 0;
}
static struct platform_driver mid_pb_driver = {
.driver = {
.name = DRIVER_NAME,
},
.probe = mid_pb_probe,
.remove = mid_pb_remove,
};
module_platform_driver(mid_pb_driver);
MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
MODULE_DESCRIPTION("Intel MID Power Button Driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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