linux-imx

/*

 * Linux I2C core

 *

 * Copyright (C) 1995-99 Simon G. Vogl

 *   With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>

 *   Mux support by Rodolfo Giometti <giometti@enneenne.com> and

 *   Michael Lawnick <michael.lawnick.ext@nsn.com>

 *

 * Copyright (C) 2013-2017 Wolfram Sang <wsa@the-dreams.de>

 *

 * 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; either version 2 of the License, or (at your option)

 * any later version.

 *

 * 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.

 */

​

#define pr_fmt(fmt) "i2c-core: " fmt

​

#include <dt-bindings/i2c/i2c.h>

#include <linux/acpi.h>

#include <linux/clk/clk-conf.h>

#include <linux/completion.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/errno.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/i2c-smbus.h>

#include <linux/idr.h>

#include <linux/init.h>

#include <linux/irqflags.h>

#include <linux/jump_label.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/of_device.h>

#include <linux/of.h>

#include <linux/of_irq.h>

#include <linux/pm_domain.h>

#include <linux/pm_runtime.h>

#include <linux/pm_wakeirq.h>

#include <linux/property.h>

#include <linux/rwsem.h>

#include <linux/slab.h>

​

#include "i2c-core.h"

​

#define CREATE_TRACE_POINTS

#include <trace/events/i2c.h>

​

#define I2C_ADDR_OFFSET_TEN_BIT 0xa000

#define I2C_ADDR_OFFSET_SLAVE   0x1000

​

#define I2C_ADDR_7BITS_MAX  0x77

#define I2C_ADDR_7BITS_COUNT    (I2C_ADDR_7BITS_MAX + 1)

​

#define I2C_ADDR_DEVICE_ID  0x7c

​

/*

 * core_lock protects i2c_adapter_idr, and guarantees that device detection,

 * deletion of detected devices are serialized

 */

static DEFINE_MUTEX(core_lock);

static DEFINE_IDR(i2c_adapter_idr);

​

static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);

​

static DEFINE_STATIC_KEY_FALSE(i2c_trace_msg_key);

static bool is_registered;

​

int i2c_transfer_trace_reg(void)

{

    static_branch_inc(&i2c_trace_msg_key);

    return 0;

}

​

void i2c_transfer_trace_unreg(void)

{

    static_branch_dec(&i2c_trace_msg_key);

}

​

const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,

                        const struct i2c_client *client)

{

    if (!(id && client))

        return NULL;

​

    while (id->name[0]) {