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/*
* Copyright 2009 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
*/
/*!
* @file mc9s08dz60keyb.c
*
* @brief Driver for the Freescale Semiconductor MXC keypad port.
*
* The keypad driver is designed as a standard Input driver which interacts
* with low level keypad port hardware. Upon opening, the Keypad driver
* initializes the keypad port. When the keypad interrupt happens the driver
* calles keypad polling timer and scans the keypad matrix for key
* press/release. If all key press/release happened it comes out of timer and
* waits for key press interrupt. The scancode for key press and release events
* are passed to Input subsytem.
*
* @ingroup keypad
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <mach/hardware.h>
#include <linux/kd.h>
#include <linux/fs.h>
#include <linux/kbd_kern.h>
#include <linux/ioctl.h>
#include <linux/poll.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/input.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/mfd/mc9s08dz60/pmic.h>
#include <asm/mach/keypad.h>
#define MOD_NAME "mc9s08dz60-keyb"
/*
* Module header file
*/
/*! Input device structure. */
static struct input_dev *mc9s08dz60kbd_dev;
static unsigned int key_status;
static int keypad_irq;
static unsigned int key_code_map[8] = {
KEY_LEFT,
KEY_DOWN,
0,
0,
KEY_UP,
KEY_RIGHT,
0,
0,
};
static unsigned int keycodes_size = 8;
static void read_key_handler(struct work_struct *work);
static DECLARE_WORK(key_pad_event, read_key_handler);
static void read_key_handler(struct work_struct *work)
{
unsigned int val1, val2;
int pre_val, curr_val, i;
val1 = val2 = 0xff;
mcu_pmic_read_reg(REG_MCU_KPD_1, &val1, 0xff);
mcu_pmic_read_reg(REG_MCU_KPD_2, &val2, 0xff);
pr_debug("key pressed, 0x%02x%02x\n", val2, val1);
for (i = 0; i < 8; i++) {
curr_val = (val1 >> i) & 0x1;
if (curr_val > 0)
input_event(mc9s08dz60kbd_dev, EV_KEY,
key_code_map[i], 1);
else {
pre_val = (key_status >> i) & 0x1;
if (pre_val > 0)
input_event(mc9s08dz60kbd_dev, EV_KEY,
key_code_map[i], 0);
}
}
key_status = val1;
}
static irqreturn_t mc9s08dz60kpp_interrupt(int irq, void *dev_id)
{
schedule_work(&key_pad_event);
return IRQ_RETVAL(1);
}
/*!
* This function is called when the keypad driver is opened.
* Since keypad initialization is done in __init, nothing is done in open.
*
* @param dev Pointer to device inode
*
* @result The function always return 0
*/
static int mc9s08dz60kpp_open(struct input_dev *dev)
{
return 0;
}
/*!
* This function is called close the keypad device.
* Nothing is done in this function, since every thing is taken care in
* __exit function.
*
* @param dev Pointer to device inode
*
*/
static void mc9s08dz60kpp_close(struct input_dev *dev)
{
}
/*!
* This function is called during the driver binding process.
*
* @param pdev the device structure used to store device specific
* information that is used by the suspend, resume and remove
* functions.
*
* @return The function returns 0 on successful registration. Otherwise returns
* specific error code.
*/
static int mc9s08dz60kpp_probe(struct platform_device *pdev)
{
int i, irq;
int retval;
retval = mcu_pmic_write_reg(REG_MCU_KPD_CONTROL, 0x1, 0x1);
if (retval != 0) {
pr_info("mc9s08dz60 keypad: mcu not detected!\n");
return retval;
}
irq = platform_get_irq(pdev, 0);
retval = request_irq(irq, mc9s08dz60kpp_interrupt,
0, MOD_NAME, MOD_NAME);
if (retval) {
pr_debug("KPP: request_irq(%d) returned error %d\n",
irq, retval);
return retval;
}
keypad_irq = irq;
mc9s08dz60kbd_dev = input_allocate_device();
if (!mc9s08dz60kbd_dev) {
pr_info(KERN_ERR "mc9s08dz60kbd_dev: \
not enough memory for input device\n");
retval = -ENOMEM;
goto err1;
}
mc9s08dz60kbd_dev->name = "mc9s08dz60kpd";
mc9s08dz60kbd_dev->id.bustype = BUS_HOST;
mc9s08dz60kbd_dev->open = mc9s08dz60kpp_open;
mc9s08dz60kbd_dev->close = mc9s08dz60kpp_close;
retval = input_register_device(mc9s08dz60kbd_dev);
if (retval < 0) {
pr_info(KERN_ERR
"mc9s08dz60kbd_dev: failed to register input device\n");
goto err2;
}
__set_bit(EV_KEY, mc9s08dz60kbd_dev->evbit);
for (i = 0; i < keycodes_size; i++)
__set_bit(key_code_map[i], mc9s08dz60kbd_dev->keybit);
device_init_wakeup(&pdev->dev, 1);
pr_info("mc9s08dz60 keypad probed\n");
return 0;
err2:
input_free_device(mc9s08dz60kbd_dev);
err1:
free_irq(irq, MOD_NAME);
return retval;
}
/*!
* Dissociates the driver from the kpp device.
*
* @param pdev the device structure used to give information on which SDHC
* to remove
*
* @return The function always returns 0.
*/
static int mc9s08dz60kpp_remove(struct platform_device *pdev)
{
free_irq(keypad_irq, MOD_NAME);
input_unregister_device(mc9s08dz60kbd_dev);
if (mc9s08dz60kbd_dev)
input_free_device(mc9s08dz60kbd_dev);
return 0;
}
/*!
* This structure contains pointers to the power management callback functions.
*/
static struct platform_driver mc9s08dz60kpd_driver = {
.driver = {
.name = "mc9s08dz60keypad",
.bus = &platform_bus_type,
},
.probe = mc9s08dz60kpp_probe,
.remove = mc9s08dz60kpp_remove
};
static int __init mc9s08dz60kpp_init(void)
{
pr_info(KERN_INFO "mc9s08dz60 keypad loaded\n");
platform_driver_register(&mc9s08dz60kpd_driver);
return 0;
}
static void __exit mc9s08dz60kpp_cleanup(void)
{
platform_driver_unregister(&mc9s08dz60kpd_driver);
}
module_init(mc9s08dz60kpp_init);
module_exit(mc9s08dz60kpp_cleanup);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MXC Keypad Controller Driver");
MODULE_LICENSE("GPL");
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