![Marc Dietrich](/assets/img/avatar_default.png)
Tegra has been converted to support device tree only. Remove support for instantiating via platform device. Signed-off-by: Leon Romanovsky <leon@leon.nu> Signed-off-by: Marc Dietrich <marvin24@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
181 lines
5.7 KiB
C
181 lines
5.7 KiB
C
/*
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* NVEC: NVIDIA compliant embedded controller interface
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*
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* Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
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*
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* Authors: Pierre-Hugues Husson <phhusson@free.fr>
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* Ilya Petrov <ilya.muromec@gmail.com>
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* Marc Dietrich <marvin24@gmx.de>
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* Julian Andres Klode <jak@jak-linux.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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*/
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#ifndef __LINUX_MFD_NVEC
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#define __LINUX_MFD_NVEC
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#include <linux/atomic.h>
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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/* NVEC_POOL_SIZE - Size of the pool in &struct nvec_msg */
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#define NVEC_POOL_SIZE 64
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/*
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* NVEC_MSG_SIZE - Maximum size of the data field of &struct nvec_msg.
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*
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* A message must store up to a SMBus block operation which consists of
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* one command byte, one count byte, and up to 32 payload bytes = 34
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* byte.
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*/
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#define NVEC_MSG_SIZE 34
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/**
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* enum nvec_event_size - The size of an event message
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* @NVEC_2BYTES: The message has one command byte and one data byte
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* @NVEC_3BYTES: The message has one command byte and two data bytes
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* @NVEC_VAR_SIZE: The message has one command byte, one count byte, and has
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* up to as many bytes as the number in the count byte. The
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* maximum is 32
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*
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* Events can be fixed or variable sized. This is useless on other message
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* types, which are always variable sized.
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*/
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enum nvec_event_size {
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NVEC_2BYTES,
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NVEC_3BYTES,
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NVEC_VAR_SIZE,
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};
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/**
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* enum nvec_msg_type - The type of a message
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* @NVEC_SYS: A system request/response
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* @NVEC_BAT: A battery request/response
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* @NVEC_KBD: A keyboard request/response
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* @NVEC_PS2: A mouse request/response
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* @NVEC_CNTL: A EC control request/response
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* @NVEC_KB_EVT: An event from the keyboard
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* @NVEC_PS2_EVT: An event from the mouse
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*
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* Events can be fixed or variable sized. This is useless on other message
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* types, which are always variable sized.
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*/
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enum nvec_msg_type {
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NVEC_SYS = 1,
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NVEC_BAT,
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NVEC_GPIO,
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NVEC_SLEEP,
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NVEC_KBD,
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NVEC_PS2,
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NVEC_CNTL,
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NVEC_OEM0 = 0x0d,
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NVEC_KB_EVT = 0x80,
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NVEC_PS2_EVT,
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};
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/**
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* struct nvec_msg - A buffer for a single message
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* @node: Messages are part of various lists in a &struct nvec_chip
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* @data: The data of the message
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* @size: For TX messages, the number of bytes used in @data
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* @pos: For RX messages, the current position to write to. For TX messages,
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* the position to read from.
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* @used: Used for the message pool to mark a message as free/allocated.
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*
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* This structure is used to hold outgoing and incoming messages. Outgoing
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* messages have a different format than incoming messages, and that is not
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* documented yet.
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*/
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struct nvec_msg {
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struct list_head node;
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unsigned char data[NVEC_MSG_SIZE];
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unsigned short size;
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unsigned short pos;
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atomic_t used;
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};
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/**
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* struct nvec_chip - A single connection to an NVIDIA Embedded controller
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* @dev: The device
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* @gpio: The same as for &struct nvec_platform_data
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* @irq: The IRQ of the I2C device
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* @i2c_addr: The address of the I2C slave
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* @base: The base of the memory mapped region of the I2C device
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* @clk: The clock of the I2C device
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* @notifier_list: Notifiers to be called on received messages, see
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* nvec_register_notifier()
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* @rx_data: Received messages that have to be processed
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* @tx_data: Messages waiting to be sent to the controller
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* @nvec_status_notifier: Internal notifier (see nvec_status_notifier())
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* @rx_work: A work structure for the RX worker nvec_dispatch()
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* @tx_work: A work structure for the TX worker nvec_request_master()
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* @wq: The work queue in which @rx_work and @tx_work are executed
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* @rx: The message currently being retrieved or %NULL
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* @msg_pool: A pool of messages for allocation
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* @tx: The message currently being transferred
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* @tx_scratch: Used for building pseudo messages
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* @ec_transfer: A completion that will be completed once a message has been
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* received (see nvec_rx_completed())
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* @tx_lock: Spinlock for modifications on @tx_data
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* @rx_lock: Spinlock for modifications on @rx_data
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* @sync_write_mutex: A mutex for nvec_write_sync()
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* @sync_write: A completion to signal that a synchronous message is complete
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* @sync_write_pending: The first two bytes of the request (type and subtype)
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* @last_sync_msg: The last synchronous message.
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* @state: State of our finite state machine used in nvec_interrupt()
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*/
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struct nvec_chip {
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struct device *dev;
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int gpio;
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int irq;
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int i2c_addr;
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void __iomem *base;
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struct clk *i2c_clk;
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struct atomic_notifier_head notifier_list;
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struct list_head rx_data, tx_data;
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struct notifier_block nvec_status_notifier;
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struct work_struct rx_work, tx_work;
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struct workqueue_struct *wq;
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struct nvec_msg msg_pool[NVEC_POOL_SIZE];
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struct nvec_msg *rx;
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struct nvec_msg *tx;
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struct nvec_msg tx_scratch;
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struct completion ec_transfer;
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spinlock_t tx_lock, rx_lock;
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/* sync write stuff */
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struct mutex sync_write_mutex;
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struct completion sync_write;
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u16 sync_write_pending;
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struct nvec_msg *last_sync_msg;
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int state;
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};
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extern int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
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short size);
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extern struct nvec_msg *nvec_write_sync(struct nvec_chip *nvec,
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const unsigned char *data, short size);
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extern int nvec_register_notifier(struct nvec_chip *nvec,
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struct notifier_block *nb,
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unsigned int events);
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extern int nvec_unregister_notifier(struct nvec_chip *dev,
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struct notifier_block *nb);
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extern void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg);
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#endif
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