linux-imx

/*

 * TI Touch Screen / ADC MFD driver

 *

 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/

 *

 * 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.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/regmap.h>

#include <linux/mfd/core.h>

#include <linux/pm_runtime.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/sched.h>

​

#include <linux/mfd/ti_am335x_tscadc.h>

​

static const struct regmap_config tscadc_regmap_config = {

    .name = "ti_tscadc",

    .reg_bits = 32,

    .reg_stride = 4,

    .val_bits = 32,

};

​

void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)

{

    unsigned long flags;

​

    spin_lock_irqsave(&tscadc->reg_lock, flags);

    tscadc->reg_se_cache |= val;

    if (tscadc->adc_waiting)

        wake_up(&tscadc->reg_se_wait);

    else if (!tscadc->adc_in_use)

        regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);

​

    spin_unlock_irqrestore(&tscadc->reg_lock, flags);

}

EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);

​

static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)

{

    DEFINE_WAIT(wait);

    u32 reg;

​

    regmap_read(tscadc->regmap, REG_ADCFSM, &reg);

    if (reg & SEQ_STATUS) {

        tscadc->adc_waiting = true;

        prepare_to_wait(&tscadc->reg_se_wait, &wait,

                TASK_UNINTERRUPTIBLE);

        spin_unlock_irq(&tscadc->reg_lock);

​