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// SPDX-License-Identifier: GPL-2.0
//
// Driver for the Winmate FM07 front-panel keys
//
// Author: Daniel Beer <daniel.beer@tirotech.co.nz>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <linux/dmi.h>
#include <linux/io.h>
#define DRV_NAME "winmate-fm07keys"
#define PORT_CMD 0x6c
#define PORT_DATA 0x68
#define EC_ADDR_KEYS 0x3b
#define EC_CMD_READ 0x80
#define BASE_KEY KEY_F13
#define NUM_KEYS 5
/* Typically we're done in fewer than 10 iterations */
#define LOOP_TIMEOUT 1000
static void fm07keys_poll(struct input_dev *input)
{
uint8_t k;
int i;
/* Flush output buffer */
i = 0;
while (inb(PORT_CMD) & 0x01) {
if (++i >= LOOP_TIMEOUT)
goto timeout;
inb(PORT_DATA);
}
/* Send request and wait for write completion */
outb(EC_CMD_READ, PORT_CMD);
i = 0;
while (inb(PORT_CMD) & 0x02)
if (++i >= LOOP_TIMEOUT)
goto timeout;
outb(EC_ADDR_KEYS, PORT_DATA);
i = 0;
while (inb(PORT_CMD) & 0x02)
if (++i >= LOOP_TIMEOUT)
goto timeout;
/* Wait for data ready */
i = 0;
while (!(inb(PORT_CMD) & 0x01))
if (++i >= LOOP_TIMEOUT)
goto timeout;
k = inb(PORT_DATA);
/* Notify of new key states */
for (i = 0; i < NUM_KEYS; i++) {
input_report_key(input, BASE_KEY + i, (~k) & 1);
k >>= 1;
}
input_sync(input);
return;
timeout:
dev_warn_ratelimited(&input->dev, "timeout polling IO memory\n");
}
static int fm07keys_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct input_dev *input;
int ret;
int i;
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "no memory for input device\n");
return -ENOMEM;
}
if (!devm_request_region(dev, PORT_CMD, 1, "Winmate FM07 EC"))
return -EBUSY;
if (!devm_request_region(dev, PORT_DATA, 1, "Winmate FM07 EC"))
return -EBUSY;
input->name = "Winmate FM07 front-panel keys";
input->phys = DRV_NAME "/input0";
input->id.bustype = BUS_HOST;
input->id.vendor = 0x0001;
input->id.product = 0x0001;
input->id.version = 0x0100;
__set_bit(EV_KEY, input->evbit);
for (i = 0; i < NUM_KEYS; i++)
__set_bit(BASE_KEY + i, input->keybit);
ret = input_setup_polling(input, fm07keys_poll);
if (ret) {
dev_err(dev, "unable to set up polling, err=%d\n", ret);
return ret;
}
/* These are silicone buttons. They can't be pressed in rapid
* succession too quickly, and 50 Hz seems to be an adequate
* sampling rate without missing any events when tested.
*/
input_set_poll_interval(input, 20);
ret = input_register_device(input);
if (ret) {
dev_err(dev, "unable to register polled device, err=%d\n",
ret);
return ret;
}
input_sync(input);
return 0;
}
static struct platform_driver fm07keys_driver = {
.probe = fm07keys_probe,
.driver = {
.name = DRV_NAME
},
};
static struct platform_device *dev;
static const struct dmi_system_id fm07keys_dmi_table[] __initconst = {
{
/* FM07 and FM07P */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Winmate Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "IP30"),
},
},
{ }
};
MODULE_DEVICE_TABLE(dmi, fm07keys_dmi_table);
static int __init fm07keys_init(void)
{
int ret;
if (!dmi_check_system(fm07keys_dmi_table))
return -ENODEV;
ret = platform_driver_register(&fm07keys_driver);
if (ret) {
pr_err("fm07keys: failed to register driver, err=%d\n", ret);
return ret;
}
dev = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
if (IS_ERR(dev)) {
ret = PTR_ERR(dev);
pr_err("fm07keys: failed to allocate device, err = %d\n", ret);
goto fail_register;
}
return 0;
fail_register:
platform_driver_unregister(&fm07keys_driver);
return ret;
}
static void __exit fm07keys_exit(void)
{
platform_driver_unregister(&fm07keys_driver);
platform_device_unregister(dev);
}
module_init(fm07keys_init);
module_exit(fm07keys_exit);
MODULE_AUTHOR("Daniel Beer <daniel.beer@tirotech.co.nz>");
MODULE_DESCRIPTION("Winmate FM07 front-panel keys driver");
MODULE_LICENSE("GPL");
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