/*
* Rotary counter driver for Analog Devices Blackfin Processors
*
* Copyright 2008-2009 Analog Devices Inc.
* Licensed under the GPL-2 or later.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <asm/portmux.h>
#include <asm/bfin_rotary.h>
static const u16 per_cnt[] = {
P_CNT_CUD,
P_CNT_CDG,
P_CNT_CZM,
0
};
struct bfin_rot {
struct input_dev *input;
int irq;
unsigned int up_key;
unsigned int down_key;
unsigned int button_key;
unsigned int rel_code;
unsigned short cnt_config;
unsigned short cnt_imask;
unsigned short cnt_debounce;
};
static void report_key_event(struct input_dev *input, int keycode)
{
/* simulate a press-n-release */
input_report_key(input, keycode, 1);
input_sync(input);
input_report_key(input, keycode, 0);
input_sync(input);
}
static void report_rotary_event(struct bfin_rot *rotary, int delta)
{
struct input_dev *input = rotary->input;
if (rotary->up_key) {
report_key_event(input,
delta > 0 ? rotary->up_key : rotary->down_key);
} else {
input_report_rel(input, rotary->rel_code, delta);
input_sync(input);
}
}
static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct bfin_rot *rotary = platform_get_drvdata(pdev);
int delta;
switch (bfin_read_CNT_STATUS()) {
case ICII:
break;
case UCII:
case DCII:
delta = bfin_read_CNT_COUNTER();
if (delta)
report_rotary_event(rotary, delta);
break;
case CZMII:
report_key_event(rotary->input, rotary->button_key);
break;
default:
break;
}
bfin_write_CNT_COMMAND(W1LCNT_ZERO); /* Clear COUNTER */
bfin_write_CNT_STATUS(-1); /* Clear STATUS */
return IRQ_HANDLED;
}
static int __devinit bfin_rotary_probe(struct platform_device *pdev)
{
struct bfin_rotary_platform_data *pdata = pdev->dev.platform_data;
struct bfin_rot *rotary;
struct input_dev *input;
int error;
/* Basic validation */
if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
(!pdata->rotary_up_key && pdata->rotary_down_key)) {
return -EINVAL;
}
error = peripheral_request_list(per_cnt, dev_name(&pdev->dev));
if (error) {
dev_err(&pdev->dev, "requesting peripherals failed\n");
return error;
}
rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
input = input_allocate_device();
if (!rotary || !input) {
error = -ENOMEM;
goto out1;
}
rotary->input = input;
rotary->up_key = pdata->rotary_up_key;
rotary->down_key = pdata->rotary_down_key;
rotary->button_key = pdata->rotary_button_key;
rotary->rel_code = pdata->rotary_rel_code;
error = rotary->irq = platform_get_irq(pdev, 0);
if (error < 0)
goto out1;
input->name = pdev->name;
input->phys = "bfin-rotary/input0";
input->dev.parent = &pdev->dev;
input_set_drvdata(input, rotary);
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
if (rotary->up_key) {
__set_bit(EV_KEY, input->evbit);
__set_bit(rotary->up_key, input->keybit);
__set_bit(rotary->down_key, input->keybit);
} else {
__set_bit(EV_REL, input->evbit);
__set_bit(rotary->rel_code, input->relbit);
}
if (rotary->button_key) {
__set_bit(EV_KEY, input->evbit);
__set_bit(rotary->button_key, input->keybit);
}
error = request_irq(rotary->irq, bfin_rotary_isr,
0, dev_name(&pdev->dev), pdev);
if (error) {
dev_err(&pdev->dev,
"unable to claim irq %d; error %d\n",
rotary->irq, error);
goto out1;
}
error = input_register_device(input);
if (error) {
dev_err(&pdev->dev,
"unable to register input device (%d)\n", error);
goto out2;
}
if (pdata->rotary_button_key)
bfin_write_CNT_IMASK(CZMIE);
if (pdata->mode & ROT_DEBE)
bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE);
if (pdata->mode)
bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() |
(pdata->mode & ~CNTE));
bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE);
bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE);
platform_set_drvdata(pdev, rotary);
device_init_wakeup(&pdev->dev, 1);
return 0;
out2:
free_irq(rotary->irq, pdev);
out1:
input_free_device(input);
kfree(rotary);
peripheral_free_list(per_cnt);
return error;
}
static int __devexit bfin_rotary_remove(struct platform_device *pdev)
{
struct bfin_rot *rotary = platform_get_drvdata(pdev);
bfin_write_CNT_CONFIG(0);
bfin_write_CNT_IMASK(0);
free_irq(rotary->irq, pdev);
input_unregister_device(rotary->input);
peripheral_free_list(per_cnt);
kfree(rotary);
platform_set_drvdata(pdev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int bfin_rotary_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bfin_rot *rotary = platform_get_drvdata(pdev);
rotary->cnt_config = bfin_read_CNT_CONFIG();
rotary->cnt_imask = bfin_read_CNT_IMASK();
rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE();
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(rotary->irq);
return 0;
}
static int bfin_rotary_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bfin_rot *rotary = platform_get_drvdata(pdev);
bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce);
bfin_write_CNT_IMASK(rotary->cnt_imask);
bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE);
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(rotary->irq);
if (rotary->cnt_config & CNTE)
bfin_write_CNT_CONFIG(rotary->cnt_config);
return 0;
}
static const struct dev_pm_ops bfin_rotary_pm_ops = {
.suspend = bfin_rotary_suspend,
.resume = bfin_rotary_resume,
};
#endif
static struct platform_driver bfin_rotary_device_driver = {
.probe = bfin_rotary_probe,
.remove = __devexit_p(bfin_rotary_remove),
.driver = {
.name = "bfin-rotary",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &bfin_rotary_pm_ops,
#endif
},
};
module_platform_driver(bfin_rotary_device_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
MODULE_ALIAS("platform:bfin-rotary");
