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drivers/i2c/hid: Add generic I2C HID driver 

Add a generic I2C-HID driver for these types of devices that
do not need extra functionality.  This allows a new device to
be added without having to write a new driver.

The i2c-hid PNP0C50 is automatically added as the _CID for the
device in the ACPI Device.

BUG=chrome-os-partner:58666
TEST=used on eve to describe a new i2c-hid touch controller

Change-Id: I94e9531a72f9bf1d6b3ade362b88883b21b83d0a
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/17856
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
This commit is contained in:
Duncan Laurie 2016-12-13 16:43:40 -08:00
parent bd10516643
commit a12fc81fef
4 changed files with 99 additions and 0 deletions
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3
src/drivers/i2c/hid/Kconfig Normal file
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config DRIVERS_I2C_HID
bool
select DRIVERS_I2C_GENERIC

1
src/drivers/i2c/hid/Makefile.inc Normal file
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ramstage-$(CONFIG_DRIVERS_I2C_HID) += hid.c

28
src/drivers/i2c/hid/chip.h Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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_I2C_HID_CHIP_H__
#define __DRIVERS_I2C_HID_CHIP_H__
#include <drivers/i2c/generic/chip.h>
#define I2C_HID_CID "PNP0C50"
struct drivers_i2c_hid_config {
struct drivers_i2c_generic_config generic;
uint8_t hid_desc_reg_offset;
};
#endif /* __I2C_HID_CHIP_H__ */

67
src/drivers/i2c/hid/hid.c Normal file
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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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/acpigen_dsm.h>
#include <device/device.h>
#include <stdint.h>
#include <string.h>
#include "chip.h"
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
static void i2c_hid_fill_dsm(struct device *dev)
{
struct drivers_i2c_hid_config *config = dev->chip_info;
struct dsm_i2c_hid_config dsm_config = {
.hid_desc_reg_offset = config->hid_desc_reg_offset,
};
acpigen_write_dsm_i2c_hid(&dsm_config);
}
static void i2c_hid_fill_ssdt_generator(struct device *dev)
{
struct drivers_i2c_hid_config *config = dev->chip_info;
config->generic.cid = I2C_HID_CID;
i2c_generic_fill_ssdt(dev, &i2c_hid_fill_dsm, &config->generic);
}
static const char *i2c_hid_acpi_name(struct device *dev)
{
static char name[5];
snprintf(name, sizeof(name), "H%03.3X", dev->path.i2c.device);
name[4] = '\0';
return name;
}
#endif
static struct device_operations i2c_hid_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
.acpi_name = &i2c_hid_acpi_name,
.acpi_fill_ssdt_generator = &i2c_hid_fill_ssdt_generator,
#endif
};
static void i2c_hid_enable(struct device *dev)
{
dev->ops = &i2c_hid_ops;
}
struct chip_operations drivers_i2c_hid_ops = {
CHIP_NAME("I2C HID Device")
.enable_dev = &i2c_hid_enable
};