/*
* Copyright (C) 2011-2014 Freescale Semiconductor, Inc. All Rights Reserved.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#define SNVS_LPSR_REG 0x4C /* LP Status Register */
#define SNVS_LPCR_REG 0x38 /* LP Control Register */
#define SNVS_HPSR_REG 0x14
#define SNVS_HPSR_BTN (0x1 << 6)
#define SNVS_LPSR_SPO (0x1 << 18)
#define SNVS_LPCR_DEP_EN (0x1 << 5)
struct pwrkey_drv_data {
void __iomem *ioaddr;
int irq;
int keycode;
int keystate; /* 1:pressed */
int wakeup;
struct timer_list check_timer;
struct input_dev *input;
};
static void imx_imx_snvs_check_for_events(unsigned long data)
{
struct pwrkey_drv_data *pdata = (struct pwrkey_drv_data *) data;
struct input_dev *input = pdata->input;
void __iomem *ioaddr = pdata->ioaddr;
u32 state;
state = ((readl_relaxed(ioaddr + SNVS_HPSR_REG) & SNVS_HPSR_BTN) ?
1 : 0);
/* only report new event if status changed */
if (state ^ pdata->keystate) {
pdata->keystate = state;
input_event(input, EV_KEY, pdata->keycode, state);
input_sync(input);
}
/* repeat check if pressed long */
if (state) {
mod_timer(&pdata->check_timer,
jiffies + msecs_to_jiffies(60));
}
}
static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
void __iomem *ioaddr = pdata->ioaddr;
u32 lp_status;
lp_status = readl_relaxed(ioaddr + SNVS_LPSR_REG);
if (lp_status & SNVS_LPSR_SPO)
mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(2));
/* clear SPO status */
writel_relaxed(lp_status, ioaddr + SNVS_LPSR_REG);
return IRQ_HANDLED;
}
static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
{
struct pwrkey_drv_data *pdata = NULL;
struct input_dev *input = NULL;
struct device_node *np;
void __iomem *ioaddr;
u32 val;
int ret = 0;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
/* Get SNVS register Page */
np = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-snvs-pwrkey");
if (!np)
return -ENODEV;
pdata->ioaddr = of_iomap(np, 0);
if (IS_ERR(pdata->ioaddr))
return PTR_ERR(pdata->ioaddr);
if (of_property_read_u32(np, "fsl,keycode", &pdata->keycode)) {
pdata->keycode = KEY_POWER;
dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
}
pdata->wakeup = !!of_get_property(np, "fsl,wakeup", NULL);
pdata->irq = platform_get_irq(pdev, 0);
if (pdata->irq < 0) {
dev_err(&pdev->dev, "no irq defined in platform data\n");
return -EINVAL;
}
ioaddr = pdata->ioaddr;
val = readl_relaxed(ioaddr + SNVS_LPCR_REG);
val |= SNVS_LPCR_DEP_EN,
writel_relaxed(val, ioaddr + SNVS_LPCR_REG);
/* clear the unexpected interrupt before driver ready */
val = readl_relaxed(ioaddr + SNVS_LPSR_REG);
if (val & SNVS_LPSR_SPO)
writel_relaxed(val | SNVS_LPSR_SPO, ioaddr + SNVS_LPSR_REG);
setup_timer(&pdata->check_timer,
imx_imx_snvs_check_for_events, (unsigned long) pdata);
if (pdata->irq >= 0) {
ret = devm_request_irq(&pdev->dev, pdata->irq,
imx_snvs_pwrkey_interrupt,
IRQF_TRIGGER_HIGH, pdev->name, pdev);
if (ret) {
dev_err(&pdev->dev, "interrupt not available.\n");
return ret;
}
}
input = devm_input_allocate_device(&pdev->dev);
if (!input) {
dev_err(&pdev->dev, "failed to allocate the input device\n");
return -ENOMEM;
}
input->name = pdev->name;
input->phys = "snvs-pwrkey/input0";
input->id.bustype = BUS_HOST;
input->evbit[0] = BIT_MASK(EV_KEY);
input_set_capability(input, EV_KEY, pdata->keycode);
ret = input_register_device(input);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register input device\n");
input_free_device(input);
return ret;
}
pdata->input = input;
platform_set_drvdata(pdev, pdata);
device_init_wakeup(&pdev->dev, pdata->wakeup);
dev_info(&pdev->dev, "i.MX snvs powerkey probed\n");
return 0;
}
static int imx_snvs_pwrkey_remove(struct platform_device *pdev)
{
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
input_unregister_device(pdata->input);
del_timer_sync(&pdata->check_timer);
return 0;
}
static int imx_snvs_pwrkey_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(pdata->irq);
return 0;
}
static int imx_snvs_pwrkey_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(pdata->irq);
return 0;
}
static const struct of_device_id imx_snvs_pwrkey_ids[] = {
{ .compatible = "fsl,imx6sx-snvs-pwrkey" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend,
imx_snvs_pwrkey_resume);
static struct platform_driver imx_snvs_pwrkey_driver = {
.driver = {
.name = "snvs_pwrkey",
.owner = THIS_MODULE,
.pm = &imx_snvs_pwrkey_pm_ops,
.of_match_table = imx_snvs_pwrkey_ids,
},
.probe = imx_snvs_pwrkey_probe,
.remove = imx_snvs_pwrkey_remove,
};
module_platform_driver(imx_snvs_pwrkey_driver);
MODULE_AUTHOR("Freescale Semiconductor");
MODULE_DESCRIPTION("i.MX snvs power key Driver");
MODULE_LICENSE("GPL");
