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/*
* 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/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/platform_data/bfin_rotary.h>
#include <asm/portmux.h>
#define CNT_CONFIG_OFF 0 /* CNT Config Offset */
#define CNT_IMASK_OFF 4 /* CNT Interrupt Mask Offset */
#define CNT_STATUS_OFF 8 /* CNT Status Offset */
#define CNT_COMMAND_OFF 12 /* CNT Command Offset */
#define CNT_DEBOUNCE_OFF 16 /* CNT Debounce Offset */
#define CNT_COUNTER_OFF 20 /* CNT Counter Offset */
#define CNT_MAX_OFF 24 /* CNT Maximum Count Offset */
#define CNT_MIN_OFF 28 /* CNT Minimum Count Offset */
struct bfin_rot {
struct input_dev *input;
void __iomem *base;
int irq;
unsigned int up_key;
unsigned int down_key;
unsigned int button_key;
unsigned int rel_code;
unsigned short mode;
unsigned short debounce;
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 bfin_rot *rotary = dev_id;
int delta;
switch (readw(rotary->base + CNT_STATUS_OFF)) {
case ICII:
break;
case UCII:
case DCII:
delta = readl(rotary->base + CNT_COUNTER_OFF);
if (delta)
report_rotary_event(rotary, delta);
break;
case CZMII:
report_key_event(rotary->input, rotary->button_key);
break;
default:
break;
}
writew(W1LCNT_ZERO, rotary->base + CNT_COMMAND_OFF); /* Clear COUNTER */
writew(-1, rotary->base + CNT_STATUS_OFF); /* Clear STATUS */
return IRQ_HANDLED;
}
static int bfin_rotary_open(struct input_dev *input)
{
struct bfin_rot *rotary = input_get_drvdata(input);
unsigned short val;
if (rotary->mode & ROT_DEBE)
writew(rotary->debounce & DPRESCALE,
rotary->base + CNT_DEBOUNCE_OFF);
writew(rotary->mode & ~CNTE, rotary->base + CNT_CONFIG_OFF);
val = UCIE | DCIE;
if (rotary->button_key)
val |= CZMIE;
writew(val, rotary->base + CNT_IMASK_OFF);
writew(rotary->mode | CNTE, rotary->base + CNT_CONFIG_OFF);
return 0;
}
static void bfin_rotary_close(struct input_dev *input)
{
struct bfin_rot *rotary = input_get_drvdata(input);
writew(0, rotary->base + CNT_CONFIG_OFF);
writew(0, rotary->base + CNT_IMASK_OFF);
}
static void bfin_rotary_free_action(void *data)
{
peripheral_free_list(data);
}
static int bfin_rotary_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct bfin_rotary_platform_data *pdata = dev_get_platdata(dev);
struct bfin_rot *rotary;
struct resource *res;
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;
}
if (pdata->pin_list) {
error = peripheral_request_list(pdata->pin_list,
dev_name(dev));
if (error) {
dev_err(dev, "requesting peripherals failed: %d\n",
error);
return error;
}
error = devm_add_action_or_reset(dev, bfin_rotary_free_action,
pdata->pin_list);
if (error) {
dev_err(dev, "setting cleanup action failed: %d\n",
error);
return error;
}
}
rotary = devm_kzalloc(dev, sizeof(struct bfin_rot), GFP_KERNEL);
if (!rotary)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rotary->base = devm_ioremap_resource(dev, res);
if (IS_ERR(rotary->base))
return PTR_ERR(rotary->base);
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
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;
rotary->mode = pdata->mode;
rotary->debounce = pdata->debounce;
input->name = pdev->name;
input->phys = "bfin-rotary/input0";
input->dev.parent = dev;
input_set_drvdata(input, rotary);
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
input->open = bfin_rotary_open;
input->close = bfin_rotary_close;
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);
}
/* Quiesce the device before requesting irq */
bfin_rotary_close(input);
rotary->irq = platform_get_irq(pdev, 0);
if (rotary->irq < 0) {
dev_err(dev, "No rotary IRQ specified\n");
return -ENOENT;
}
error = devm_request_irq(dev, rotary->irq, bfin_rotary_isr,
0, dev_name(dev), rotary);
if (error) {
dev_err(dev, "unable to claim irq %d; error %d\n",
rotary->irq, error);
return error;
}
error = input_register_device(input);
if (error) {
dev_err(dev, "unable to register input device (%d)\n", error);
return error;
}
platform_set_drvdata(pdev, rotary);
device_init_wakeup(dev, 1);
return 0;
}
static int __maybe_unused 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 = readw(rotary->base + CNT_CONFIG_OFF);
rotary->cnt_imask = readw(rotary->base + CNT_IMASK_OFF);
rotary->cnt_debounce = readw(rotary->base + CNT_DEBOUNCE_OFF);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(rotary->irq);
return 0;
}
static int __maybe_unused bfin_rotary_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bfin_rot *rotary = platform_get_drvdata(pdev);
writew(rotary->cnt_debounce, rotary->base + CNT_DEBOUNCE_OFF);
writew(rotary->cnt_imask, rotary->base + CNT_IMASK_OFF);
writew(rotary->cnt_config & ~CNTE, rotary->base + CNT_CONFIG_OFF);
if (device_may_wakeup(&pdev->dev))
disable_irq_wake(rotary->irq);
if (rotary->cnt_config & CNTE)
writew(rotary->cnt_config, rotary->base + CNT_CONFIG_OFF);
return 0;
}
static SIMPLE_DEV_PM_OPS(bfin_rotary_pm_ops,
bfin_rotary_suspend, bfin_rotary_resume);
static struct platform_driver bfin_rotary_device_driver = {
.probe = bfin_rotary_probe,
.driver = {
.name = "bfin-rotary",
.pm = &bfin_rotary_pm_ops,
},
};
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");
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