linux-kernel-test/drivers/leds/leds-clevo-mail.c
Dmitry Torokhov 181d683d75 Input: libps2 - additional locking for i8042 ports
The serio ports on i8042 are not completely isolated; while we provide
enough locking to ensure proper serialization when accessing control
and data registers AUX and KBD ports can still have an effect on each
other on PS/2 protocol level. The most prominent effect is that
issuing a command for the device connected to one port may cause
abort of the command currently executing by the device connected to
another port.

Since i8042 nor serio subsystem are not aware of the details of the
PS/2 protocol (length of the commands and their replies and so on) the
locking should be done on libps2 level by adding special handling when
we see that we are dealing with serio port on i8042.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2009-09-17 23:23:45 -07:00

220 lines
5.5 KiB
C

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/i8042.h>
#define CLEVO_MAIL_LED_OFF 0x0084
#define CLEVO_MAIL_LED_BLINK_1HZ 0x008A
#define CLEVO_MAIL_LED_BLINK_0_5HZ 0x0083
MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
MODULE_DESCRIPTION("Clevo mail LED driver");
MODULE_LICENSE("GPL");
static unsigned int __initdata nodetect;
module_param_named(nodetect, nodetect, bool, 0);
MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
static struct platform_device *pdev;
static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
{
printk(KERN_INFO KBUILD_MODNAME ": '%s' found\n", id->ident);
return 1;
}
/*
* struct mail_led_whitelist - List of known good models
*
* Contains the known good models this driver is compatible with.
* When adding a new model try to be as strict as possible. This
* makes it possible to keep the false positives (the model is
* detected as working, but in reality it is not) as low as
* possible.
*/
static struct dmi_system_id __initdata mail_led_whitelist[] = {
{
.callback = clevo_mail_led_dmi_callback,
.ident = "Clevo D410J",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
}
},
{
.callback = clevo_mail_led_dmi_callback,
.ident = "Clevo M5x0N",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
}
},
{
.callback = clevo_mail_led_dmi_callback,
.ident = "Positivo Mobile",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
DMI_MATCH(DMI_PRODUCT_NAME, "Positivo Mobile"),
DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
}
},
{
.callback = clevo_mail_led_dmi_callback,
.ident = "Clevo D400P",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
DMI_MATCH(DMI_BOARD_NAME, "D400P"),
DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
}
},
{
.callback = clevo_mail_led_dmi_callback,
.ident = "Clevo D410V",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
}
},
{ }
};
static void clevo_mail_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
i8042_lock_chip();
if (value == LED_OFF)
i8042_command(NULL, CLEVO_MAIL_LED_OFF);
else if (value <= LED_HALF)
i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
else
i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
i8042_unlock_chip();
}
static int clevo_mail_led_blink(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
int status = -EINVAL;
i8042_lock_chip();
if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
/* Special case: the leds subsystem requested us to
* chose one user friendly blinking of the LED, and
* start it. Let's blink the led slowly (0.5Hz).
*/
*delay_on = 1000; /* ms */
*delay_off = 1000; /* ms */
i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
status = 0;
} else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
/* blink the led with 1Hz */
i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
status = 0;
} else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
/* blink the led with 0.5Hz */
i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
status = 0;
} else {
printk(KERN_DEBUG KBUILD_MODNAME
": clevo_mail_led_blink(..., %lu, %lu),"
" returning -EINVAL (unsupported)\n",
*delay_on, *delay_off);
}
i8042_unlock_chip();
return status;
}
static struct led_classdev clevo_mail_led = {
.name = "clevo::mail",
.brightness_set = clevo_mail_led_set,
.blink_set = clevo_mail_led_blink,
.flags = LED_CORE_SUSPENDRESUME,
};
static int __init clevo_mail_led_probe(struct platform_device *pdev)
{
return led_classdev_register(&pdev->dev, &clevo_mail_led);
}
static int clevo_mail_led_remove(struct platform_device *pdev)
{
led_classdev_unregister(&clevo_mail_led);
return 0;
}
static struct platform_driver clevo_mail_led_driver = {
.probe = clevo_mail_led_probe,
.remove = clevo_mail_led_remove,
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
},
};
static int __init clevo_mail_led_init(void)
{
int error = 0;
int count = 0;
/* Check with the help of DMI if we are running on supported hardware */
if (!nodetect) {
count = dmi_check_system(mail_led_whitelist);
} else {
count = 1;
printk(KERN_ERR KBUILD_MODNAME ": Skipping DMI detection. "
"If the driver works on your hardware please "
"report model and the output of dmidecode in tracker "
"at http://sourceforge.net/projects/clevo-mailled/\n");
}
if (!count)
return -ENODEV;
pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
if (!IS_ERR(pdev)) {
error = platform_driver_probe(&clevo_mail_led_driver,
clevo_mail_led_probe);
if (error) {
printk(KERN_ERR KBUILD_MODNAME
": Can't probe platform driver\n");
platform_device_unregister(pdev);
}
} else
error = PTR_ERR(pdev);
return error;
}
static void __exit clevo_mail_led_exit(void)
{
platform_device_unregister(pdev);
platform_driver_unregister(&clevo_mail_led_driver);
clevo_mail_led_set(NULL, LED_OFF);
}
module_init(clevo_mail_led_init);
module_exit(clevo_mail_led_exit);