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/* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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) "%s: " fmt, __func__
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <mach/sdio_al.h>
#include <mach/sdio_smem.h>
static void sdio_smem_read(struct work_struct *work);
static struct sdio_channel *channel;
static struct workqueue_struct *workq;
static DECLARE_WORK(work_read, sdio_smem_read);
static DECLARE_WAIT_QUEUE_HEAD(waitq);
static int bytes_avail;
static int sdio_ch_opened;
static void sdio_smem_release(struct device *dev)
{
pr_debug("sdio smem released\n");
}
static struct sdio_smem_client client;
static void sdio_smem_read(struct work_struct *work)
{
int err;
int read_avail;
char *data = client.buf;
if (!sdio_ch_opened)
return;
read_avail = sdio_read_avail(channel);
if (read_avail > bytes_avail ||
read_avail < 0) {
pr_err("Error: read_avail=%d bytes_avail=%d\n",
read_avail, bytes_avail);
goto read_err;
}
if (read_avail == 0)
return;
err = sdio_read(channel,
&data[client.size - bytes_avail],
read_avail);
if (err) {
pr_err("sdio_read error (%d)", err);
goto read_err;
}
bytes_avail -= read_avail;
pr_debug("read %d bytes (bytes_avail = %d)\n",
read_avail, bytes_avail);
if (!bytes_avail) {
bytes_avail = client.size;
err = client.cb_func(SDIO_SMEM_EVENT_READ_DONE);
}
if (err)
pr_err("error (%d) on callback\n", err);
return;
read_err:
if (sdio_ch_opened)
client.cb_func(SDIO_SMEM_EVENT_READ_ERR);
return;
}
static void sdio_smem_notify(void *priv, unsigned event)
{
pr_debug("%d event received\n", event);
if (event == SDIO_EVENT_DATA_READ_AVAIL ||
event == SDIO_EVENT_DATA_WRITE_AVAIL)
queue_work(workq, &work_read);
}
int sdio_smem_register_client(void)
{
int err = 0;
if (!client.buf || !client.size || !client.cb_func)
return -EINVAL;
pr_debug("buf = %p\n", client.buf);
pr_debug("size = 0x%x\n", client.size);
bytes_avail = client.size;
workq = create_singlethread_workqueue("sdio_smem");
if (!workq)
return -ENOMEM;
sdio_ch_opened = 1;
err = sdio_open("SDIO_SMEM", &channel, NULL, sdio_smem_notify);
if (err) {
sdio_ch_opened = 0;
pr_err("sdio_open error (%d)\n", err);
destroy_workqueue(workq);
return err;
}
pr_debug("SDIO SMEM channel opened\n");
return err;
}
int sdio_smem_unregister_client(void)
{
int err = 0;
sdio_ch_opened = 0;
err = sdio_close(channel);
if (err) {
pr_err("sdio_close error (%d)\n", err);
return err;
}
pr_debug("SDIO SMEM channel closed\n");
flush_workqueue(workq);
destroy_workqueue(workq);
bytes_avail = 0;
client.buf = NULL;
client.cb_func = NULL;
client.size = 0;
return 0;
}
static int sdio_smem_probe(struct platform_device *pdev)
{
client.plat_dev.name = "SDIO_SMEM_CLIENT";
client.plat_dev.id = -1;
client.plat_dev.dev.release = sdio_smem_release;
return platform_device_register(&client.plat_dev);
}
static int sdio_smem_remove(struct platform_device *pdev)
{
platform_device_unregister(&client.plat_dev);
memset(&client, 0, sizeof(client));
sdio_ch_opened = 0;
return 0;
}
static struct platform_driver sdio_smem_drv = {
.probe = sdio_smem_probe,
.remove = sdio_smem_remove,
.driver = {
.name = "SDIO_SMEM",
.owner = THIS_MODULE,
},
};
static int __init sdio_smem_init(void)
{
return platform_driver_register(&sdio_smem_drv);
};
module_init(sdio_smem_init);
MODULE_DESCRIPTION("SDIO SMEM");
MODULE_LICENSE("GPL v2");
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