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57b33ff077
Chromebooks can have more than one Embedded Controller so the cros_ec device id has to be incremented for each EC registered. Add a new structure to represent multiple EC as different char devices (e.g: /dev/cros_ec, /dev/cros_pd). It connects to cros_ec_device and allows sysfs inferface for cros_pd. Also reduce number of allocated objects, make chromeos sysfs class object a static and add refcounting to prevent object deletion while command is in progress. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Dmitry Torokhov <dtor@chromium.org> Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Tested-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Lee Jones <lee.jones@linaro.org>
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/*
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* cros_ec_dev - expose the Chrome OS Embedded Controller to userspace
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _CROS_EC_DEV_H_
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#define _CROS_EC_DEV_H_
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#include <linux/ioctl.h>
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#include <linux/types.h>
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#include <linux/mfd/cros_ec.h>
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#define CROS_EC_DEV_VERSION "1.0.0"
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/*
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* @offset: within EC_LPC_ADDR_MEMMAP region
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* @bytes: number of bytes to read. zero means "read a string" (including '\0')
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* (at most only EC_MEMMAP_SIZE bytes can be read)
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* @buffer: where to store the result
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* ioctl returns the number of bytes read, negative on error
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*/
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struct cros_ec_readmem {
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uint32_t offset;
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uint32_t bytes;
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uint8_t buffer[EC_MEMMAP_SIZE];
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};
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#define CROS_EC_DEV_IOC 0xEC
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#define CROS_EC_DEV_IOCXCMD _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
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#define CROS_EC_DEV_IOCRDMEM _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)
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#endif /* _CROS_EC_DEV_H_ */
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