GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drivers/gpio_keys: Add driver for handling gpio-keys 

This change adds the required device node in SSDT for defining
gpio-keys/gpio-keys-polled. Currently, it supports only one gpio-key
per device node.

BUG=b:71329519
TEST=Verified by adding details to devicetree that device node is
added to SSDT:
        Device (PENH)
        {
            Name (_HID, "PRP0001")  // _HID: Hardware ID
            Name (_CRS, ResourceTemplate ()  // _CRS: Current Resource Settings
            {
                GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionInputOnly,
                    "\\_SB.PCI0.GPIO", 0x00, ResourceConsumer, ,
                    )
                    {   // Pin list
                        0x002B
                    }
            })
            Name (_DSD, Package (0x04)  // _DSD: Device-Specific Data
            {
                ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
                Package (0x01)
                {
                    Package (0x02)
                    {
                        "compatible",
                        "gpio-keys"
                    }
                },

                ToUUID ("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
                Package (0x01)
                {
                    Package (0x02)
                    {
                        "button-0",
                        "EJCT"
                    }
                }
            })
            Name (EJCT, Package (0x02)
            {
                ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301") /* Device Properties for _DSD */,
                Package (0x04)
                {
                    Package (0x02)
                    {
                        "linux,code",
                        0x0F
                    },

                    Package (0x02)
                    {
                        "linux,input-type",
                        0x05
                    },

                    Package (0x02)
                    {
                        "label",
                        "pen_eject"
                    },

                    Package (0x02)
                    {
                        "gpios",
                        Package (0x04)
                        {
                            \_SB.PCI0.I2C0.PENH,
                            Zero,
                            Zero,
                            One
                        }
                    }
                }
            })
        }

Change-Id: I6f11397b17d9de1c87d56f6a61669ef4052ec27b
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/23236
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Furquan Shaikh 2018-01-11 19:28:37 -08:00 committed by Furquan Shaikh
parent c32e6cb34a
commit 3c8e00e4cc
4 changed files with 200 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/drivers/generic/gpio_keys/Kconfig Normal file
View File

@ -0,0 +1,3 @@
config DRIVERS_GENERIC_GPIO_KEYS
bool
depends on HAVE_ACPI_TABLES

1
src/drivers/generic/gpio_keys/Makefile.inc Normal file
View File

@ -0,0 +1 @@
ramstage-$(CONFIG_DRIVERS_GENERIC_GPIO_KEYS) += gpio_keys.c

67
src/drivers/generic/gpio_keys/chip.h Normal file
View File

@ -0,0 +1,67 @@
/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __DRIVERS_GENERIC_GPIO_KEYS_H__
#define __DRIVERS_GENERIC_GPIO_KEYS_H__
#include <arch/acpi_device.h>
#include <stdint.h>
/* Linux input type */
enum {
/* Switch event */
EV_SW = 0x5,
};
/* Switch events type (Linux code emitted for EV_SW) */
enum {
SW_PEN_INSERTED = 0xf,
};
/* Details of the child node defining key */
struct key_info {
/* Device name of the child node - Mandatory */
const char *dev_name;
/* Keycode emitted for this key - Mandatory */
uint32_t linux_code;
/*
* Event type generated for this key
* See EV_* above.
*/
uint32_t linux_input_type;
/* Descriptive name of the key */
const char *label;
/* Can this key wake-up the system? */
bool is_wakeup_source;
/* Can this key be disabled? */
bool can_be_disabled;
/* Debounce interval time in milliseconds */
uint32_t debounce_interval;
};
struct drivers_generic_gpio_keys_config {
/* Device name of the parent gpio-keys node */
const char *name;
/* GPIO line providing the key - Mandatory */
struct acpi_gpio gpio;
/* Is this a polled GPIO button? - Optional */
bool is_polled;
/* Poll inverval - Mandatory only if GPIO is polled. */
uint32_t poll_interval;
/* Details about the key - Mandatory */
struct key_info key;
};
#endif /* __DRIVERS_GENERIC_GPIO_KEYS_H__ */

129
src/drivers/generic/gpio_keys/gpio_keys.c Normal file
View File

@ -0,0 +1,129 @@
/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
static struct acpi_dp *gpio_keys_add_child_node(
struct drivers_generic_gpio_keys_config *config,
const char *parent_path)
{
struct key_info *key = &config->key;
struct acpi_dp *dsd;
if (!key->dev_name || !key->linux_code)
return NULL;
dsd = acpi_dp_new_table(config->key.dev_name);
acpi_dp_add_integer(dsd, "linux,code", key->linux_code);
if (key->linux_input_type)
acpi_dp_add_integer(dsd, "linux,input-type",
key->linux_input_type);
if (key->label)
acpi_dp_add_string(dsd, "label", key->label);
if (key->is_wakeup_source)
acpi_dp_add_integer(dsd, "wakeup-source",
key->is_wakeup_source);
if (key->can_be_disabled)
acpi_dp_add_integer(dsd, "linux,can-disable",
key->can_be_disabled);
if (key->debounce_interval)
acpi_dp_add_integer(dsd, "debounce-interval",
key->debounce_interval);
acpi_dp_add_gpio(dsd, "gpios", parent_path, 0, 0,
config->gpio.polarity);
return dsd;
}
static void gpio_keys_fill_ssdt_generator(struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
const char *path = acpi_device_path(dev);
struct acpi_dp *dsd, *child;
const char *drv_string = config->is_polled ? "gpio-keys-polled"
: "gpio-keys";
if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
return;
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
/* _HID is set to PRP0001 */
acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
/* Resources - _CRS */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(&config->gpio);
acpigen_write_resourcetemplate_footer();
/* DSD */
dsd = acpi_dp_new_table("_DSD");
acpi_dp_add_string(dsd, "compatible", drv_string);
if (config->is_polled)
acpi_dp_add_integer(dsd, "poll-interval",
config->poll_interval);
/* Child device defining key */
child = gpio_keys_add_child_node(config, path);
if (child)
acpi_dp_add_child(dsd, "button-0", child);
acpi_dp_write(dsd);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *gpio_keys_acpi_name(const struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "K%03.3X", config->gpio.pins[0]);
name[4] = '\0';
return name;
}
static struct device_operations gpio_keys_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.acpi_name = &gpio_keys_acpi_name,
.acpi_fill_ssdt_generator = &gpio_keys_fill_ssdt_generator,
};
static void gpio_keys_enable(struct device *dev)
{
dev->ops = &gpio_keys_ops;
}
struct chip_operations drivers_generic_gpio_keys_ops = {
CHIP_NAME("GPIO Keys")
.enable_dev = &gpio_keys_enable
};