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/*
*
* arch/arm/mach-u300/mmc.c
*
*
* Copyright (C) 2009 ST-Ericsson AB
* License terms: GNU General Public License (GPL) version 2
*
* Author: Linus Walleij <linus.walleij@stericsson.com>
* Author: Johan Lundin <johan.lundin@stericsson.com>
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
*/
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/mmc/host.h>
#include <linux/input.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/machine.h>
#include <linux/gpio.h>
#include <linux/amba/mmci.h>
#include "mmc.h"
#include "padmux.h"
struct mmci_card_event {
struct input_dev *mmc_input;
int mmc_inserted;
struct work_struct workq;
struct mmci_platform_data mmc0_plat_data;
};
static unsigned int mmc_status(struct device *dev)
{
struct mmci_card_event *mmci_card = container_of(
dev->platform_data,
struct mmci_card_event, mmc0_plat_data);
return mmci_card->mmc_inserted;
}
static int mmci_callback(void *data)
{
struct mmci_card_event *mmci_card = data;
disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD);
schedule_work(&mmci_card->workq);
return 0;
}
static ssize_t gpio_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mmci_card_event *mmci_card = container_of(
dev->platform_data,
struct mmci_card_event, mmc0_plat_data);
return sprintf(buf, "%d\n", !mmci_card->mmc_inserted);
}
static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL);
static void _mmci_callback(struct work_struct *ws)
{
struct mmci_card_event *mmci_card = container_of(
ws,
struct mmci_card_event, workq);
mdelay(20);
mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD);
input_report_switch(mmci_card->mmc_input, KEY_INSERT,
!mmci_card->mmc_inserted);
input_sync(mmci_card->mmc_input);
pr_debug("MMC/SD card was %s\n",
mmci_card->mmc_inserted ? "removed" : "inserted");
enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted);
}
int __devinit mmc_init(struct amba_device *adev)
{
struct mmci_card_event *mmci_card;
struct device *mmcsd_device = &adev->dev;
struct pmx *pmx;
int ret = 0;
mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL);
if (!mmci_card)
return -ENOMEM;
/*
* Do not set ocr_mask or voltage translation function,
* we have a regulator we can control instead.
*/
/* Nominally 2.85V on our platform */
mmci_card->mmc0_plat_data.status = mmc_status;
mmci_card->mmc0_plat_data.gpio_wp = -1;
mmci_card->mmc0_plat_data.gpio_cd = -1;
mmci_card->mmc0_plat_data.capabilities = MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_SD_HIGHSPEED | MMC_CAP_4_BIT_DATA;
mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
INIT_WORK(&mmci_card->workq, _mmci_callback);
ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection");
if (ret) {
printk(KERN_CRIT "Could not allocate MMC card detection " \
"GPIO pin\n");
goto out;
}
ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD);
if (ret) {
printk(KERN_CRIT "Invalid GPIO pin requested\n");
goto out;
}
ret = sysfs_create_file(&mmcsd_device->kobj,
&dev_attr_mmc_inserted.attr);
if (ret)
goto out;
mmci_card->mmc_input = input_allocate_device();
if (!mmci_card->mmc_input) {
printk(KERN_CRIT "Could not allocate MMC input device\n");
return -ENOMEM;
}
mmci_card->mmc_input->name = "MMC insert notification";
mmci_card->mmc_input->id.bustype = BUS_HOST;
mmci_card->mmc_input->id.vendor = 0;
mmci_card->mmc_input->id.product = 0;
mmci_card->mmc_input->id.version = 0x0100;
mmci_card->mmc_input->dev.parent = mmcsd_device;
input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT);
/*
* Since this must always be compiled into the kernel, this input
* is never unregistered or free:ed.
*/
ret = input_register_device(mmci_card->mmc_input);
if (ret) {
input_free_device(mmci_card->mmc_input);
goto out;
}
input_set_drvdata(mmci_card->mmc_input, mmci_card);
/*
* Setup padmuxing for MMC. Since this must always be
* compiled into the kernel, pmx is never released.
*/
pmx = pmx_get(mmcsd_device, U300_APP_PMX_MMC_SETTING);
if (IS_ERR(pmx))
pr_warning("Could not get padmux handle\n");
else {
ret = pmx_activate(mmcsd_device, pmx);
if (IS_ERR_VALUE(ret))
pr_warning("Could not activate padmuxing\n");
}
ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback,
mmci_card);
schedule_work(&mmci_card->workq);
printk(KERN_INFO "Registered MMC insert/remove notification\n");
out:
return ret;
}
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