gpio.c

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/*
 * Copyright (c) 2004-2008 Reyk Floeter <[email protected]>
 * Copyright (c) 2006-2008 Nick Kossifidis <[email protected]>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/****************\
  GPIO Functions
\****************/

#include "ath5k.h"
#include "reg.h"
#include "debug.h"


void
ath5k_hw_set_ledstate(struct ath5k_hw *ah, unsigned int state)
{
    u32 led;
    /*5210 has different led mode handling*/
    u32 led_5210;

    /*Reset led status*/
    if (ah->ah_version != AR5K_AR5210)
        AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG,
            AR5K_PCICFG_LEDMODE |  AR5K_PCICFG_LED);
    else
        AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG, AR5K_PCICFG_LED);

    /*
     * Some blinking values, define at your wish
     */
    switch (state) {
    case AR5K_LED_SCAN:
    case AR5K_LED_AUTH:
        led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_PEND;
        led_5210 = AR5K_PCICFG_LED_PEND | AR5K_PCICFG_LED_BCTL;
        break;

    case AR5K_LED_INIT:
        led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_NONE;
        led_5210 = AR5K_PCICFG_LED_PEND;
        break;

    case AR5K_LED_ASSOC:
    case AR5K_LED_RUN:
        led = AR5K_PCICFG_LEDMODE_PROP | AR5K_PCICFG_LED_ASSOC;
        led_5210 = AR5K_PCICFG_LED_ASSOC;
        break;

    default:
        led = AR5K_PCICFG_LEDMODE_PROM | AR5K_PCICFG_LED_NONE;
        led_5210 = AR5K_PCICFG_LED_PEND;
        break;
    }

    /*Write new status to the register*/
    if (ah->ah_version != AR5K_AR5210)
        AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led);
    else
        AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, led_5210);
}

int
ath5k_hw_set_gpio_input(struct ath5k_hw *ah, u32 gpio)
{
    if (gpio >= AR5K_NUM_GPIO)
        return -EINVAL;

    ath5k_hw_reg_write(ah,
        (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
        | AR5K_GPIOCR_IN(gpio), AR5K_GPIOCR);

    return 0;
}

int
ath5k_hw_set_gpio_output(struct ath5k_hw *ah, u32 gpio)
{
    if (gpio >= AR5K_NUM_GPIO)
        return -EINVAL;

    ath5k_hw_reg_write(ah,
        (ath5k_hw_reg_read(ah, AR5K_GPIOCR) & ~AR5K_GPIOCR_OUT(gpio))
        | AR5K_GPIOCR_OUT(gpio), AR5K_GPIOCR);

    return 0;
}

u32
ath5k_hw_get_gpio(struct ath5k_hw *ah, u32 gpio)
{
    if (gpio >= AR5K_NUM_GPIO)
        return 0xffffffff;

    /* GPIO input magic */
    return ((ath5k_hw_reg_read(ah, AR5K_GPIODI) & AR5K_GPIODI_M) >> gpio) &
        0x1;
}

int
ath5k_hw_set_gpio(struct ath5k_hw *ah, u32 gpio, u32 val)
{
    u32 data;

    if (gpio >= AR5K_NUM_GPIO)
        return -EINVAL;

    /* GPIO output magic */
    data = ath5k_hw_reg_read(ah, AR5K_GPIODO);

    data &= ~(1 << gpio);
    data |= (val & 1) << gpio;

    ath5k_hw_reg_write(ah, data, AR5K_GPIODO);

    return 0;
}

void
ath5k_hw_set_gpio_intr(struct ath5k_hw *ah, unsigned int gpio,
        u32 interrupt_level)
{
    u32 data;

    if (gpio >= AR5K_NUM_GPIO)
        return;

    /*
     * Set the GPIO interrupt
     */
    data = (ath5k_hw_reg_read(ah, AR5K_GPIOCR) &
        ~(AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_SELH |
        AR5K_GPIOCR_INT_ENA | AR5K_GPIOCR_OUT(gpio))) |
        (AR5K_GPIOCR_INT_SEL(gpio) | AR5K_GPIOCR_INT_ENA);

    ath5k_hw_reg_write(ah, interrupt_level ? data :
        (data | AR5K_GPIOCR_INT_SELH), AR5K_GPIOCR);

    ah->ah_imr |= AR5K_IMR_GPIO;

    /* Enable GPIO interrupts */
    AR5K_REG_ENABLE_BITS(ah, AR5K_PIMR, AR5K_IMR_GPIO);
}