pxa2xx_hx4700.c

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/*
 *  Copyright (C) 2012 Paul Parsons <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/irq.h>

#include <asm/mach-types.h>
#include <mach/hx4700.h>

#include "soc_common.h"

static struct gpio gpios[] = {
    { GPIO114_HX4700_CF_RESET,    GPIOF_OUT_INIT_LOW,   "CF reset"        },
    { EGPIO4_CF_3V3_ON,           GPIOF_OUT_INIT_LOW,   "CF 3.3V enable"  },
};

static int hx4700_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
{
    int ret;

    ret = gpio_request_array(gpios, ARRAY_SIZE(gpios));
    if (ret)
        goto out;

    /*
     * IRQ type must be set before soc_pcmcia_hw_init() calls request_irq().
     * The asic3 default IRQ type is level trigger low level detect, exactly
     * the the signal present on GPIOD4_CF_nCD when a CF card is inserted.
     * If the IRQ type is not changed, the asic3 interrupt handler will loop
     * repeatedly because it is unable to clear the level trigger interrupt.
     */
    irq_set_irq_type(gpio_to_irq(GPIOD4_CF_nCD), IRQ_TYPE_EDGE_BOTH);

    skt->stat[SOC_STAT_CD].gpio = GPIOD4_CF_nCD;
    skt->stat[SOC_STAT_CD].name = "PCMCIA CD";
    skt->stat[SOC_STAT_RDY].gpio = GPIO60_HX4700_CF_RNB;
    skt->stat[SOC_STAT_RDY].name = "PCMCIA Ready";

out:
    return ret;
}

static void hx4700_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
{
    gpio_free_array(gpios, ARRAY_SIZE(gpios));
}

static void hx4700_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
    struct pcmcia_state *state)
{
    state->vs_3v = 1;
    state->vs_Xv = 0;
}

static int hx4700_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
    const socket_state_t *state)
{
    switch (state->Vcc) {
    case 0:
        gpio_set_value(EGPIO4_CF_3V3_ON, 0);
        break;
    case 33:
        gpio_set_value(EGPIO4_CF_3V3_ON, 1);
        break;
    default:
        printk(KERN_ERR "pcmcia: Unsupported Vcc: %d\n", state->Vcc);
        return -EINVAL;
    }

    gpio_set_value(GPIO114_HX4700_CF_RESET, (state->flags & SS_RESET) != 0);

    return 0;
}

static struct pcmcia_low_level hx4700_pcmcia_ops = {
    .owner          = THIS_MODULE,
    .nr             = 1,
    .hw_init        = hx4700_pcmcia_hw_init,
    .hw_shutdown    = hx4700_pcmcia_hw_shutdown,
    .socket_state   = hx4700_pcmcia_socket_state,
    .configure_socket = hx4700_pcmcia_configure_socket,
};

static struct platform_device *hx4700_pcmcia_device;

static int __init hx4700_pcmcia_init(void)
{
    struct platform_device *pdev;

    if (!machine_is_h4700())
        return -ENODEV;

    pdev = platform_device_register_data(NULL, "pxa2xx-pcmcia", -1,
        &hx4700_pcmcia_ops, sizeof(hx4700_pcmcia_ops));
    if (IS_ERR(pdev))
        return PTR_ERR(pdev);

    hx4700_pcmcia_device = pdev;

    return 0;
}

static void __exit hx4700_pcmcia_exit(void)
{
    platform_device_unregister(hx4700_pcmcia_device);
}

module_init(hx4700_pcmcia_init);
module_exit(hx4700_pcmcia_exit);

MODULE_AUTHOR("Paul Parsons <[email protected]>");
MODULE_DESCRIPTION("HP iPAQ hx4700 PCMCIA driver");
MODULE_LICENSE("GPL");