blob: 586e8905590ba7a4428174bd3c076af80a0f8123 [file] [log] [blame]
/* Copyright (c) 2010-2011, Code Aurora Forum. 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.
*/
/*
* SDIO Control Driver -- Provides a binary SDIO muxed control port
* interface.
*/
#include <linux/cdev.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
#include <asm/ioctls.h>
#include <linux/platform_device.h>
#include <mach/msm_smd.h>
#include <mach/sdio_al.h>
#include <mach/sdio_cmux.h>
#include "modem_notifier.h"
#include <linux/slab.h>
#define MAX_WRITE_RETRY 5
#define MAGIC_NO_V1 0x33FC
#define NUM_SDIO_CTL_PORTS 10
#define DEVICE_NAME "sdioctl"
#define MAX_BUF_SIZE 2048
#define DEBUG
static int msm_sdio_ctl_debug_mask;
module_param_named(debug_mask, msm_sdio_ctl_debug_mask,
int, S_IRUGO | S_IWUSR | S_IWGRP);
struct sdio_ctl_dev {
int id;
char name[9];
struct cdev cdev;
struct device *devicep;
struct mutex dev_lock;
int ref_count;
struct mutex rx_lock;
uint32_t read_avail;
struct list_head rx_list;
wait_queue_head_t read_wait_queue;
wait_queue_head_t write_wait_queue;
} *sdio_ctl_devp[NUM_SDIO_CTL_PORTS];
struct sdio_ctl_pkt {
int data_size;
void *data;
};
struct sdio_ctl_list_elem {
struct list_head list;
struct sdio_ctl_pkt ctl_pkt;
};
struct class *sdio_ctl_classp;
static dev_t sdio_ctl_number;
static uint32_t sdio_ctl_inited;
enum {
MSM_SDIO_CTL_DEBUG = 1U << 0,
MSM_SDIO_CTL_DUMP_BUFFER = 1U << 1,
};
#if defined(DEBUG)
#define D_DUMP_BUFFER(prestr, cnt, buf) \
do { \
if (msm_sdio_ctl_debug_mask & MSM_SDIO_CTL_DUMP_BUFFER) { \
int i; \
pr_info("%s", prestr); \
for (i = 0; i < cnt; i++) \
pr_info("%.2x", buf[i]); \
pr_info("\n"); \
} \
} while (0)
#define D(x...) \
do { \
if (msm_sdio_ctl_debug_mask & MSM_SDIO_CTL_DEBUG) \
pr_info(x); \
} while (0)
#else
#define D_DUMP_BUFFER(prestr, cnt, buf) do {} while (0)
#define D(x...) do {} while (0)
#endif
static uint32_t cmux_ch_id[] = {
SDIO_CMUX_DATA_CTL_0,
SDIO_CMUX_DATA_CTL_1,
SDIO_CMUX_DATA_CTL_2,
SDIO_CMUX_DATA_CTL_3,
SDIO_CMUX_DATA_CTL_4,
SDIO_CMUX_DATA_CTL_5,
SDIO_CMUX_DATA_CTL_6,
SDIO_CMUX_DATA_CTL_7,
SDIO_CMUX_USB_CTL_0,
SDIO_CMUX_CSVT_CTL_0
};
static int get_ctl_dev_index(int id)
{
int dev_index;
for (dev_index = 0; dev_index < NUM_SDIO_CTL_PORTS; dev_index++) {
if (cmux_ch_id[dev_index] == id)
return dev_index;
}
return -ENODEV;
}
static void sdio_ctl_receive_cb(void *data, int size, void *priv)
{
struct sdio_ctl_list_elem *list_elem = NULL;
int id = ((struct sdio_ctl_dev *)(priv))->id;
int dev_index;
if (id < 0 || id > cmux_ch_id[NUM_SDIO_CTL_PORTS - 1])
return;
dev_index = get_ctl_dev_index(id);
if (dev_index < 0) {
pr_err("%s: Ch%d is not exported to user-space\n",
__func__, id);
return;
}
if (!data || size <= 0) {
wake_up(&sdio_ctl_devp[dev_index]->read_wait_queue);
return;
}
list_elem = kmalloc(sizeof(struct sdio_ctl_list_elem), GFP_KERNEL);
if (!list_elem) {
pr_err("%s: list_elem alloc failed\n", __func__);
return;
}
list_elem->ctl_pkt.data = kmalloc(size, GFP_KERNEL);
if (!list_elem->ctl_pkt.data) {
pr_err("%s: list_elem->data alloc failed\n", __func__);
kfree(list_elem);
return;
}
memcpy(list_elem->ctl_pkt.data, data, size);
list_elem->ctl_pkt.data_size = size;
mutex_lock(&sdio_ctl_devp[dev_index]->rx_lock);
list_add_tail(&list_elem->list, &sdio_ctl_devp[dev_index]->rx_list);
sdio_ctl_devp[dev_index]->read_avail += size;
mutex_unlock(&sdio_ctl_devp[dev_index]->rx_lock);
wake_up(&sdio_ctl_devp[dev_index]->read_wait_queue);
}
static void sdio_ctl_write_done(void *data, int size, void *priv)
{
int id = ((struct sdio_ctl_dev *)(priv))->id;
int dev_index;
if (id < 0 || id > cmux_ch_id[NUM_SDIO_CTL_PORTS - 1])
return;
dev_index = get_ctl_dev_index(id);
if (dev_index < 0) {
pr_err("%s: Ch%d is not exported to user-space\n",
__func__, id);
return;
}
wake_up(&sdio_ctl_devp[dev_index]->write_wait_queue);
}
static long sdio_ctl_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret;
struct sdio_ctl_dev *sdio_ctl_devp;
sdio_ctl_devp = file->private_data;
if (!sdio_ctl_devp)
return -ENODEV;
switch (cmd) {
case TIOCMGET:
ret = sdio_cmux_tiocmget(sdio_ctl_devp->id);
break;
case TIOCMSET:
ret = sdio_cmux_tiocmset(sdio_ctl_devp->id, arg, ~arg);
break;
default:
ret = -EINVAL;
}
return ret;
}
ssize_t sdio_ctl_read(struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
int r = 0, id, bytes_to_read;
struct sdio_ctl_dev *sdio_ctl_devp;
struct sdio_ctl_list_elem *list_elem = NULL;
sdio_ctl_devp = file->private_data;
if (!sdio_ctl_devp)
return -ENODEV;
D("%s: read from ch%d\n", __func__, sdio_ctl_devp->id);
id = sdio_ctl_devp->id;
mutex_lock(&sdio_ctl_devp->rx_lock);
while (sdio_ctl_devp->read_avail <= 0) {
mutex_unlock(&sdio_ctl_devp->rx_lock);
r = wait_event_interruptible(sdio_ctl_devp->read_wait_queue,
sdio_ctl_devp->read_avail > 0 ||
!is_remote_open(id));
if (sdio_cmux_is_channel_reset(id))
return -ENETRESET;
if (!is_remote_open(id))
return -ENODEV;
if (r < 0) {
/* qualify error message */
/* we get this anytime a signal comes in */
if (r != -ERESTARTSYS)
pr_err("ERROR:%s: wait_event_interruptible "
"ret %i\n", __func__, r);
return r;
}
mutex_lock(&sdio_ctl_devp->rx_lock);
}
if (list_empty(&sdio_ctl_devp->rx_list)) {
mutex_unlock(&sdio_ctl_devp->rx_lock);
D("%s: Nothing in ch%d's rx_list\n", __func__,
sdio_ctl_devp->id);
return -EAGAIN;
}
list_elem = list_first_entry(&sdio_ctl_devp->rx_list,
struct sdio_ctl_list_elem, list);
bytes_to_read = (uint32_t)(list_elem->ctl_pkt.data_size);
if (bytes_to_read > count) {
mutex_unlock(&sdio_ctl_devp->rx_lock);
pr_err("%s: Packet size %d > buf size %d\n", __func__,
bytes_to_read, count);
return -ENOMEM;
}
if (copy_to_user(buf, list_elem->ctl_pkt.data, bytes_to_read)) {
mutex_unlock(&sdio_ctl_devp->rx_lock);
pr_err("%s: copy_to_user failed for ch%d\n", __func__,
sdio_ctl_devp->id);
return -EFAULT;
}
sdio_ctl_devp->read_avail -= bytes_to_read;
list_del(&list_elem->list);
kfree(list_elem->ctl_pkt.data);
kfree(list_elem);
mutex_unlock(&sdio_ctl_devp->rx_lock);
D("%s: Returning %d bytes to ch%d\n", __func__,
bytes_to_read, sdio_ctl_devp->id);
return bytes_to_read;
}
ssize_t sdio_ctl_write(struct file *file,
const char __user *buf,
size_t count,
loff_t *ppos)
{
int r = 0, id;
char *temp_buf;
struct sdio_ctl_dev *sdio_ctl_devp;
if (count <= 0)
return -EINVAL;
sdio_ctl_devp = file->private_data;
if (!sdio_ctl_devp)
return -ENODEV;
D("%s: writing %i bytes on ch%d\n",
__func__, count, sdio_ctl_devp->id);
id = sdio_ctl_devp->id;
mutex_lock(&sdio_ctl_devp->dev_lock);
while (sdio_cmux_write_avail(id) < count) {
mutex_unlock(&sdio_ctl_devp->dev_lock);
r = wait_event_interruptible(sdio_ctl_devp->write_wait_queue,
sdio_cmux_write_avail(id) >= count
|| !is_remote_open(id));
if (sdio_cmux_is_channel_reset(id))
return -ENETRESET;
if (!is_remote_open(id))
return -ENODEV;
if (r < 0) {
/* qualify error message */
/* we get this anytime a signal comes in */
if (r != -ERESTARTSYS)
pr_err("ERROR:%s: wait_event_interruptible "
"ret %i\n", __func__, r);
return r;
}
mutex_lock(&sdio_ctl_devp->dev_lock);
}
temp_buf = kmalloc(count, GFP_KERNEL);
if (!temp_buf) {
mutex_unlock(&sdio_ctl_devp->dev_lock);
pr_err("%s: temp_buf alloc failed\n", __func__);
return -ENOMEM;
}
if (copy_from_user(temp_buf, buf, count)) {
mutex_unlock(&sdio_ctl_devp->dev_lock);
pr_err("%s: copy_from_user failed\n", __func__);
kfree(temp_buf);
return -EFAULT;
}
r = sdio_cmux_write(id, (void *)temp_buf, count);
kfree(temp_buf);
mutex_unlock(&sdio_ctl_devp->dev_lock);
return r;
}
int sdio_ctl_open(struct inode *inode, struct file *file)
{
int r = 0;
struct sdio_ctl_dev *sdio_ctl_devp;
if (!sdio_ctl_inited)
return -EIO;
sdio_ctl_devp = container_of(inode->i_cdev, struct sdio_ctl_dev, cdev);
if (!sdio_ctl_devp)
return -ENODEV;
D("%s called on sdioctl%d device\n", __func__, sdio_ctl_devp->id);
r = sdio_cmux_open(sdio_ctl_devp->id, sdio_ctl_receive_cb,
sdio_ctl_write_done, NULL,
sdio_ctl_devp);
if (r < 0) {
pr_err("ERROR %s: sdio_cmux_open failed with rc %d\n",
__func__, r);
return r;
}
mutex_lock(&sdio_ctl_devp->dev_lock);
sdio_ctl_devp->ref_count++;
mutex_unlock(&sdio_ctl_devp->dev_lock);
file->private_data = sdio_ctl_devp;
return 0;
}
int sdio_ctl_release(struct inode *inode, struct file *file)
{
struct sdio_ctl_dev *sdio_ctl_devp;
struct sdio_ctl_list_elem *list_elem = NULL;
sdio_ctl_devp = file->private_data;
if (!sdio_ctl_devp)
return -EINVAL;
D("%s called on sdioctl%d device\n", __func__, sdio_ctl_devp->id);
mutex_lock(&sdio_ctl_devp->dev_lock);
if (sdio_ctl_devp->ref_count > 0) {
sdio_ctl_devp->ref_count--;
if (!sdio_ctl_devp->ref_count) {
mutex_lock(&sdio_ctl_devp->rx_lock);
while (!list_empty(&sdio_ctl_devp->rx_list)) {
list_elem = list_first_entry(
&sdio_ctl_devp->rx_list,
struct sdio_ctl_list_elem,
list);
list_del(&list_elem->list);
kfree(list_elem->ctl_pkt.data);
kfree(list_elem);
}
sdio_ctl_devp->read_avail = 0;
mutex_unlock(&sdio_ctl_devp->rx_lock);
sdio_cmux_close(sdio_ctl_devp->id);
}
}
mutex_unlock(&sdio_ctl_devp->dev_lock);
file->private_data = NULL;
return 0;
}
static const struct file_operations sdio_ctl_fops = {
.owner = THIS_MODULE,
.open = sdio_ctl_open,
.release = sdio_ctl_release,
.read = sdio_ctl_read,
.write = sdio_ctl_write,
.unlocked_ioctl = sdio_ctl_ioctl,
};
static int sdio_ctl_probe(struct platform_device *pdev)
{
int i;
int r;
pr_info("%s Begins\n", __func__);
for (i = 0; i < NUM_SDIO_CTL_PORTS; ++i) {
sdio_ctl_devp[i] = kzalloc(sizeof(struct sdio_ctl_dev),
GFP_KERNEL);
if (IS_ERR(sdio_ctl_devp[i])) {
pr_err("ERROR:%s kmalloc() ENOMEM\n", __func__);
r = -ENOMEM;
goto error0;
}
sdio_ctl_devp[i]->id = cmux_ch_id[i];
sdio_ctl_devp[i]->ref_count = 0;
mutex_init(&sdio_ctl_devp[i]->dev_lock);
init_waitqueue_head(&sdio_ctl_devp[i]->read_wait_queue);
init_waitqueue_head(&sdio_ctl_devp[i]->write_wait_queue);
mutex_init(&sdio_ctl_devp[i]->rx_lock);
INIT_LIST_HEAD(&sdio_ctl_devp[i]->rx_list);
sdio_ctl_devp[i]->read_avail = 0;
}
r = alloc_chrdev_region(&sdio_ctl_number, 0, NUM_SDIO_CTL_PORTS,
DEVICE_NAME);
if (IS_ERR_VALUE(r)) {
pr_err("ERROR:%s: alloc_chrdev_region() ret %i.\n",
__func__, r);
goto error0;
}
sdio_ctl_classp = class_create(THIS_MODULE, DEVICE_NAME);
if (IS_ERR(sdio_ctl_classp)) {
pr_err("ERROR:%s: class_create() ENOMEM\n", __func__);
r = -ENOMEM;
goto error1;
}
for (i = 0; i < NUM_SDIO_CTL_PORTS; ++i) {
cdev_init(&sdio_ctl_devp[i]->cdev, &sdio_ctl_fops);
sdio_ctl_devp[i]->cdev.owner = THIS_MODULE;
r = cdev_add(&sdio_ctl_devp[i]->cdev, (sdio_ctl_number + i),
1);
if (IS_ERR_VALUE(r)) {
pr_err("%s: cdev_add() ret %i\n", __func__, r);
kfree(sdio_ctl_devp[i]);
goto error2;
}
sdio_ctl_devp[i]->devicep =
device_create(sdio_ctl_classp, NULL,
(sdio_ctl_number + i), NULL,
DEVICE_NAME "%d", cmux_ch_id[i]);
if (IS_ERR(sdio_ctl_devp[i]->devicep)) {
pr_err("%s: device_create() ENOMEM\n", __func__);
r = -ENOMEM;
cdev_del(&sdio_ctl_devp[i]->cdev);
kfree(sdio_ctl_devp[i]);
goto error2;
}
}
sdio_ctl_inited = 1;
D("SDIO Control Port Driver Initialized.\n");
return 0;
error2:
while (--i >= 0) {
cdev_del(&sdio_ctl_devp[i]->cdev);
device_destroy(sdio_ctl_classp,
MKDEV(MAJOR(sdio_ctl_number), i));
}
class_destroy(sdio_ctl_classp);
i = NUM_SDIO_CTL_PORTS;
error1:
unregister_chrdev_region(MAJOR(sdio_ctl_number), NUM_SDIO_CTL_PORTS);
error0:
while (--i >= 0)
kfree(sdio_ctl_devp[i]);
return r;
}
static int sdio_ctl_remove(struct platform_device *pdev)
{
int i;
for (i = 0; i < NUM_SDIO_CTL_PORTS; ++i) {
cdev_del(&sdio_ctl_devp[i]->cdev);
kfree(sdio_ctl_devp[i]);
device_destroy(sdio_ctl_classp,
MKDEV(MAJOR(sdio_ctl_number), i));
}
class_destroy(sdio_ctl_classp);
unregister_chrdev_region(MAJOR(sdio_ctl_number), NUM_SDIO_CTL_PORTS);
return 0;
}
static struct platform_driver sdio_ctl_driver = {
.probe = sdio_ctl_probe,
.remove = sdio_ctl_remove,
.driver = {
.name = "SDIO_CTL",
.owner = THIS_MODULE,
},
};
static int __init sdio_ctl_init(void)
{
msm_sdio_ctl_debug_mask = 0;
return platform_driver_register(&sdio_ctl_driver);
}
module_init(sdio_ctl_init);
MODULE_DESCRIPTION("MSM SDIO Control Port");
MODULE_LICENSE("GPL v2");