mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
platform/x86: Support for EC-connected GPIOs for identify LED/button on Barco P50 board
Add a driver providing access to the GPIOs for the identify button and led present on Barco P50 board, based on the pcengines-apuv2.c driver. There is unfortunately no suitable ACPI entry for the EC communication interface, so instead bind to boards with "P50" as their DMI product family and hard code the I/O port number (0x299). The driver also hooks up the leds-gpio and gpio-keys-polled drivers to the GPIOs, so they are finally exposed as: LED: /sys/class/leds/identify Button: (/proc/bus/input/devices) I: Bus=0019 Vendor=0001 Product=0001 Version=0100 N: Name="identify" P: Phys=gpio-keys-polled/input0 S: Sysfs=/devices/platform/barco-p50-gpio/gpio-keys-polled/input/input10 U: Uniq= H: Handlers=event10 B: PROP=0 B: EV=3 B: KEY=1000000 0 0 0 0 0 0 Signed-off-by: Santosh Kumar Yadav <santoshkumar.yadav@barco.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Link: https://lore.kernel.org/r/20211020123634.2638-1-peter@korsgaard.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
parent
5ecc1e9478
commit
86af1d02d4
4 changed files with 455 additions and 0 deletions
|
@ -3215,6 +3215,12 @@ F: drivers/video/backlight/
|
|||
F: include/linux/backlight.h
|
||||
F: include/linux/pwm_backlight.h
|
||||
|
||||
BARCO P50 GPIO DRIVER
|
||||
M: Santosh Kumar Yadav <santoshkumar.yadav@barco.com>
|
||||
M: Peter Korsgaard <peter.korsgaard@barco.com>
|
||||
S: Maintained
|
||||
F: drivers/platform/x86/barco-p50-gpio.c
|
||||
|
||||
BATMAN ADVANCED
|
||||
M: Marek Lindner <mareklindner@neomailbox.ch>
|
||||
M: Simon Wunderlich <sw@simonwunderlich.de>
|
||||
|
|
|
@ -729,6 +729,16 @@ config PCENGINES_APU2
|
|||
To compile this driver as a module, choose M here: the module
|
||||
will be called pcengines-apuv2.
|
||||
|
||||
config BARCO_P50_GPIO
|
||||
tristate "Barco P50 GPIO driver for identify LED/button"
|
||||
depends on GPIOLIB
|
||||
help
|
||||
This driver provides access to the GPIOs for the identify button
|
||||
and led present on Barco P50 board.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called barco-p50-gpio.
|
||||
|
||||
config SAMSUNG_LAPTOP
|
||||
tristate "Samsung Laptop driver"
|
||||
depends on RFKILL || RFKILL = n
|
||||
|
|
|
@ -81,6 +81,9 @@ obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o
|
|||
# PC Engines
|
||||
obj-$(CONFIG_PCENGINES_APU2) += pcengines-apuv2.o
|
||||
|
||||
# Barco
|
||||
obj-$(CONFIG_BARCO_P50_GPIO) += barco-p50-gpio.o
|
||||
|
||||
# Samsung
|
||||
obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop.o
|
||||
obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o
|
||||
|
|
436
drivers/platform/x86/barco-p50-gpio.c
Normal file
436
drivers/platform/x86/barco-p50-gpio.c
Normal file
|
@ -0,0 +1,436 @@
|
|||
// SPDX-License-Identifier: GPL-2.0+
|
||||
|
||||
/*
|
||||
* Support for EC-connected GPIOs for identify
|
||||
* LED/button on Barco P50 board
|
||||
*
|
||||
* Copyright (C) 2021 Barco NV
|
||||
* Author: Santosh Kumar Yadav <santoshkumar.yadav@barco.com>
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||||
|
||||
#include <linux/io.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/dmi.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/leds.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/gpio_keys.h>
|
||||
#include <linux/gpio/driver.h>
|
||||
#include <linux/gpio/machine.h>
|
||||
#include <linux/input.h>
|
||||
|
||||
|
||||
#define DRIVER_NAME "barco-p50-gpio"
|
||||
|
||||
/* GPIO lines */
|
||||
#define P50_GPIO_LINE_LED 0
|
||||
#define P50_GPIO_LINE_BTN 1
|
||||
|
||||
/* GPIO IO Ports */
|
||||
#define P50_GPIO_IO_PORT_BASE 0x299
|
||||
|
||||
#define P50_PORT_DATA 0x00
|
||||
#define P50_PORT_CMD 0x01
|
||||
|
||||
#define P50_STATUS_OBF 0x01 /* EC output buffer full */
|
||||
#define P50_STATUS_IBF 0x02 /* EC input buffer full */
|
||||
|
||||
#define P50_CMD_READ 0xa0
|
||||
#define P50_CMD_WRITE 0x50
|
||||
|
||||
/* EC mailbox registers */
|
||||
#define P50_MBOX_REG_CMD 0x00
|
||||
#define P50_MBOX_REG_STATUS 0x01
|
||||
#define P50_MBOX_REG_PARAM 0x02
|
||||
#define P50_MBOX_REG_DATA 0x03
|
||||
|
||||
#define P50_MBOX_CMD_READ_GPIO 0x11
|
||||
#define P50_MBOX_CMD_WRITE_GPIO 0x12
|
||||
#define P50_MBOX_CMD_CLEAR 0xff
|
||||
|
||||
#define P50_MBOX_STATUS_SUCCESS 0x01
|
||||
|
||||
#define P50_MBOX_PARAM_LED 0x12
|
||||
#define P50_MBOX_PARAM_BTN 0x13
|
||||
|
||||
|
||||
struct p50_gpio {
|
||||
struct gpio_chip gc;
|
||||
struct mutex lock;
|
||||
unsigned long base;
|
||||
struct platform_device *leds_pdev;
|
||||
struct platform_device *keys_pdev;
|
||||
};
|
||||
|
||||
static struct platform_device *gpio_pdev;
|
||||
|
||||
static int gpio_params[] = {
|
||||
[P50_GPIO_LINE_LED] = P50_MBOX_PARAM_LED,
|
||||
[P50_GPIO_LINE_BTN] = P50_MBOX_PARAM_BTN,
|
||||
};
|
||||
|
||||
static const char * const gpio_names[] = {
|
||||
[P50_GPIO_LINE_LED] = "identify-led",
|
||||
[P50_GPIO_LINE_BTN] = "identify-button",
|
||||
};
|
||||
|
||||
|
||||
static struct gpiod_lookup_table p50_gpio_led_table = {
|
||||
.dev_id = "leds-gpio",
|
||||
.table = {
|
||||
GPIO_LOOKUP_IDX(DRIVER_NAME, P50_GPIO_LINE_LED, NULL, 0, GPIO_ACTIVE_HIGH),
|
||||
{}
|
||||
}
|
||||
};
|
||||
|
||||
/* GPIO LEDs */
|
||||
static struct gpio_led leds[] = {
|
||||
{ .name = "identify" }
|
||||
};
|
||||
|
||||
static struct gpio_led_platform_data leds_pdata = {
|
||||
.num_leds = ARRAY_SIZE(leds),
|
||||
.leds = leds,
|
||||
};
|
||||
|
||||
/* GPIO keyboard */
|
||||
static struct gpio_keys_button buttons[] = {
|
||||
{
|
||||
.code = KEY_RESTART,
|
||||
.gpio = P50_GPIO_LINE_BTN,
|
||||
.active_low = 1,
|
||||
.type = EV_KEY,
|
||||
.value = 1,
|
||||
},
|
||||
};
|
||||
|
||||
static struct gpio_keys_platform_data keys_pdata = {
|
||||
.buttons = buttons,
|
||||
.nbuttons = ARRAY_SIZE(buttons),
|
||||
.poll_interval = 100,
|
||||
.rep = 0,
|
||||
.name = "identify",
|
||||
};
|
||||
|
||||
|
||||
/* low level access routines */
|
||||
|
||||
static int p50_wait_ec(struct p50_gpio *p50, int mask, int expected)
|
||||
{
|
||||
int i, val;
|
||||
|
||||
for (i = 0; i < 100; i++) {
|
||||
val = inb(p50->base + P50_PORT_CMD) & mask;
|
||||
if (val == expected)
|
||||
return 0;
|
||||
usleep_range(500, 2000);
|
||||
}
|
||||
|
||||
dev_err(p50->gc.parent, "Timed out waiting for EC (0x%x)\n", val);
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
|
||||
static int p50_read_mbox_reg(struct p50_gpio *p50, int reg)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = p50_wait_ec(p50, P50_STATUS_IBF, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* clear output buffer flag, prevent unfinished commands */
|
||||
inb(p50->base + P50_PORT_DATA);
|
||||
|
||||
/* cmd/address */
|
||||
outb(P50_CMD_READ | reg, p50->base + P50_PORT_CMD);
|
||||
|
||||
ret = p50_wait_ec(p50, P50_STATUS_OBF, P50_STATUS_OBF);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return inb(p50->base + P50_PORT_DATA);
|
||||
}
|
||||
|
||||
static int p50_write_mbox_reg(struct p50_gpio *p50, int reg, int val)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = p50_wait_ec(p50, P50_STATUS_IBF, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* cmd/address */
|
||||
outb(P50_CMD_WRITE | reg, p50->base + P50_PORT_CMD);
|
||||
|
||||
ret = p50_wait_ec(p50, P50_STATUS_IBF, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* data */
|
||||
outb(val, p50->base + P50_PORT_DATA);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* mbox routines */
|
||||
|
||||
static int p50_wait_mbox_idle(struct p50_gpio *p50)
|
||||
{
|
||||
int i, val;
|
||||
|
||||
for (i = 0; i < 1000; i++) {
|
||||
val = p50_read_mbox_reg(p50, P50_MBOX_REG_CMD);
|
||||
/* cmd is 0 when idle */
|
||||
if (val <= 0)
|
||||
return val;
|
||||
|
||||
usleep_range(500, 2000);
|
||||
}
|
||||
|
||||
dev_err(p50->gc.parent, "Timed out waiting for EC mbox idle (CMD: 0x%x)\n", val);
|
||||
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
static int p50_send_mbox_cmd(struct p50_gpio *p50, int cmd, int param, int data)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = p50_wait_mbox_idle(p50);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_write_mbox_reg(p50, P50_MBOX_REG_DATA, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_write_mbox_reg(p50, P50_MBOX_REG_PARAM, param);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_write_mbox_reg(p50, P50_MBOX_REG_CMD, cmd);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_wait_mbox_idle(p50);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_read_mbox_reg(p50, P50_MBOX_REG_STATUS);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (ret == P50_MBOX_STATUS_SUCCESS)
|
||||
return 0;
|
||||
|
||||
dev_err(p50->gc.parent, "Mbox command failed (CMD=0x%x STAT=0x%x PARAM=0x%x DATA=0x%x)\n",
|
||||
cmd, ret, param, data);
|
||||
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
|
||||
/* gpio routines */
|
||||
|
||||
static int p50_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
|
||||
{
|
||||
switch (offset) {
|
||||
case P50_GPIO_LINE_BTN:
|
||||
return GPIO_LINE_DIRECTION_IN;
|
||||
|
||||
case P50_GPIO_LINE_LED:
|
||||
return GPIO_LINE_DIRECTION_OUT;
|
||||
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int p50_gpio_get(struct gpio_chip *gc, unsigned int offset)
|
||||
{
|
||||
struct p50_gpio *p50 = gpiochip_get_data(gc);
|
||||
int ret;
|
||||
|
||||
mutex_lock(&p50->lock);
|
||||
|
||||
ret = p50_send_mbox_cmd(p50, P50_MBOX_CMD_READ_GPIO, gpio_params[offset], 0);
|
||||
if (ret == 0)
|
||||
ret = p50_read_mbox_reg(p50, P50_MBOX_REG_DATA);
|
||||
|
||||
mutex_unlock(&p50->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void p50_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
|
||||
{
|
||||
struct p50_gpio *p50 = gpiochip_get_data(gc);
|
||||
|
||||
mutex_lock(&p50->lock);
|
||||
|
||||
p50_send_mbox_cmd(p50, P50_MBOX_CMD_WRITE_GPIO, gpio_params[offset], value);
|
||||
|
||||
mutex_unlock(&p50->lock);
|
||||
}
|
||||
|
||||
static int p50_gpio_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct p50_gpio *p50;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
||||
if (!res) {
|
||||
dev_err(&pdev->dev, "Cannot get I/O ports\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (!devm_request_region(&pdev->dev, res->start, resource_size(res), pdev->name)) {
|
||||
dev_err(&pdev->dev, "Unable to reserve I/O region\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
p50 = devm_kzalloc(&pdev->dev, sizeof(*p50), GFP_KERNEL);
|
||||
if (!p50)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_set_drvdata(pdev, p50);
|
||||
mutex_init(&p50->lock);
|
||||
p50->base = res->start;
|
||||
p50->gc.owner = THIS_MODULE;
|
||||
p50->gc.parent = &pdev->dev;
|
||||
p50->gc.label = dev_name(&pdev->dev);
|
||||
p50->gc.ngpio = ARRAY_SIZE(gpio_names);
|
||||
p50->gc.names = gpio_names;
|
||||
p50->gc.can_sleep = true;
|
||||
p50->gc.base = -1;
|
||||
p50->gc.get_direction = p50_gpio_get_direction;
|
||||
p50->gc.get = p50_gpio_get;
|
||||
p50->gc.set = p50_gpio_set;
|
||||
|
||||
|
||||
/* reset mbox */
|
||||
ret = p50_wait_mbox_idle(p50);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_write_mbox_reg(p50, P50_MBOX_REG_CMD, P50_MBOX_CMD_CLEAR);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = p50_wait_mbox_idle(p50);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
|
||||
ret = devm_gpiochip_add_data(&pdev->dev, &p50->gc, p50);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Could not register gpiochip: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
gpiod_add_lookup_table(&p50_gpio_led_table);
|
||||
|
||||
p50->leds_pdev = platform_device_register_data(&pdev->dev,
|
||||
"leds-gpio", PLATFORM_DEVID_NONE, &leds_pdata, sizeof(leds_pdata));
|
||||
|
||||
if (IS_ERR(p50->leds_pdev)) {
|
||||
ret = PTR_ERR(p50->leds_pdev);
|
||||
dev_err(&pdev->dev, "Could not register leds-gpio: %d\n", ret);
|
||||
goto err_leds;
|
||||
}
|
||||
|
||||
/* gpio-keys-polled uses old-style gpio interface, pass the right identifier */
|
||||
buttons[0].gpio += p50->gc.base;
|
||||
|
||||
p50->keys_pdev =
|
||||
platform_device_register_data(&pdev->dev, "gpio-keys-polled",
|
||||
PLATFORM_DEVID_NONE,
|
||||
&keys_pdata, sizeof(keys_pdata));
|
||||
|
||||
if (IS_ERR(p50->keys_pdev)) {
|
||||
ret = PTR_ERR(p50->keys_pdev);
|
||||
dev_err(&pdev->dev, "Could not register gpio-keys-polled: %d\n", ret);
|
||||
goto err_keys;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_keys:
|
||||
platform_device_unregister(p50->leds_pdev);
|
||||
err_leds:
|
||||
gpiod_remove_lookup_table(&p50_gpio_led_table);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int p50_gpio_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct p50_gpio *p50 = platform_get_drvdata(pdev);
|
||||
|
||||
platform_device_unregister(p50->keys_pdev);
|
||||
platform_device_unregister(p50->leds_pdev);
|
||||
|
||||
gpiod_remove_lookup_table(&p50_gpio_led_table);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver p50_gpio_driver = {
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
},
|
||||
.probe = p50_gpio_probe,
|
||||
.remove = p50_gpio_remove,
|
||||
};
|
||||
|
||||
/* Board setup */
|
||||
static const struct dmi_system_id dmi_ids[] __initconst = {
|
||||
{
|
||||
.matches = {
|
||||
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Barco"),
|
||||
DMI_EXACT_MATCH(DMI_PRODUCT_FAMILY, "P50")
|
||||
},
|
||||
},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(dmi, dmi_ids);
|
||||
|
||||
static int __init p50_module_init(void)
|
||||
{
|
||||
struct resource res = DEFINE_RES_IO(P50_GPIO_IO_PORT_BASE, P50_PORT_CMD + 1);
|
||||
|
||||
if (!dmi_first_match(dmi_ids))
|
||||
return -ENODEV;
|
||||
|
||||
platform_driver_register(&p50_gpio_driver);
|
||||
|
||||
gpio_pdev = platform_device_register_simple(DRIVER_NAME, PLATFORM_DEVID_NONE, &res, 1);
|
||||
if (IS_ERR(gpio_pdev)) {
|
||||
pr_err("failed registering %s: %ld\n", DRIVER_NAME, PTR_ERR(gpio_pdev));
|
||||
platform_driver_unregister(&p50_gpio_driver);
|
||||
return PTR_ERR(gpio_pdev);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit p50_module_exit(void)
|
||||
{
|
||||
platform_device_unregister(gpio_pdev);
|
||||
platform_driver_unregister(&p50_gpio_driver);
|
||||
}
|
||||
|
||||
module_init(p50_module_init);
|
||||
module_exit(p50_module_exit);
|
||||
|
||||
MODULE_AUTHOR("Santosh Kumar Yadav, Barco NV <santoshkumar.yadav@barco.com>");
|
||||
MODULE_DESCRIPTION("Barco P50 identify GPIOs driver");
|
||||
MODULE_LICENSE("GPL");
|
Loading…
Reference in a new issue