android_kernel_samsung_hero.../drivers/char/diag/diagfwd_hsic.c
2016-08-17 16:41:52 +08:00

453 lines
10 KiB
C

/* Copyright (c) 2012-2014, 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.
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <linux/diagchar.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/ratelimit.h>
#include <linux/workqueue.h>
#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <asm/current.h>
#include "diagmem.h"
#include "diagfwd_bridge.h"
#include "diagfwd_hsic.h"
#define DIAG_HSIC_STRING_SZ 11
struct diag_hsic_info diag_hsic[NUM_HSIC_DEV] = {
{
.id = HSIC_1,
.dev_id = DIAGFWD_MDM,
.name = "MDM",
.mempool = POOL_TYPE_MDM,
.opened = 0,
.enabled = 0,
.suspended = 0,
.hsic_wq = NULL
},
{
.id = HSIC_2,
.dev_id = DIAGFWD_MDM_DCI,
.name = "MDM_DCI",
.mempool = POOL_TYPE_MDM_DCI,
.opened = 0,
.enabled = 0,
.suspended = 0,
.hsic_wq = NULL
}
};
static void diag_hsic_read_complete(void *ctxt, char *buf, int len,
int actual_size)
{
int err = 0;
int index = (int)(uintptr_t)ctxt;
struct diag_hsic_info *ch = NULL;
if (index < 0 || index >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid HSIC index %d\n",
__func__, index);
return;
}
ch = &diag_hsic[index];
/*
* Don't pass on the buffer if the channel is closed when a pending read
* completes. Also, actual size can be negative error codes - do not
* pass on the buffer.
*/
if (!ch->opened || actual_size <= 0)
goto fail;
err = diag_remote_dev_read_done(ch->dev_id, buf, actual_size);
if (err)
goto fail;
return;
fail:
diagmem_free(driver, buf, ch->mempool);
queue_work(ch->hsic_wq, &ch->read_work);
return;
}
static void diag_hsic_write_complete(void *ctxt, char *buf, int len,
int actual_size)
{
int index = (int)(uintptr_t)ctxt;
struct diag_hsic_info *ch = NULL;
if (index < 0 || index >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid HSIC index %d\n",
__func__, index);
return;
}
ch = &diag_hsic[index];
diag_remote_dev_write_done(ch->dev_id, buf, actual_size, ch->id);
return;
}
static int diag_hsic_suspend(void *ctxt)
{
int index = (int)(uintptr_t)ctxt;
unsigned long flags;
struct diag_hsic_info *ch = NULL;
if (index < 0 || index >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid HSIC index %d\n",
__func__, index);
return -EINVAL;
}
ch = &diag_hsic[index];
spin_lock_irqsave(&ch->lock, flags);
ch->suspended = 1;
spin_unlock_irqrestore(&ch->lock, flags);
return 0;
}
static void diag_hsic_resume(void *ctxt)
{
int index = (int)(uintptr_t)ctxt;
unsigned long flags;
struct diag_hsic_info *ch = NULL;
if (index < 0 || index >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid HSIC index %d\n",
__func__, index);
return;
}
ch = &diag_hsic[index];
spin_lock_irqsave(&ch->lock, flags);
ch->suspended = 0;
spin_unlock_irqrestore(&ch->lock, flags);
queue_work(ch->hsic_wq, &(ch->read_work));
}
static struct diag_bridge_ops diag_hsic_ops[NUM_HSIC_DEV] = {
{
.ctxt = (void *)HSIC_1,
.read_complete_cb = diag_hsic_read_complete,
.write_complete_cb = diag_hsic_write_complete,
.suspend = diag_hsic_suspend,
.resume = diag_hsic_resume,
},
{
.ctxt = (void *)HSIC_2,
.read_complete_cb = diag_hsic_read_complete,
.write_complete_cb = diag_hsic_write_complete,
.suspend = diag_hsic_suspend,
.resume = diag_hsic_resume,
}
};
static int hsic_open(int id)
{
int err = 0;
unsigned long flags;
struct diag_hsic_info *ch = NULL;
if (id < 0 || id >= NUM_HSIC_DEV) {
pr_err("diag: Invalid index %d in %s\n", id, __func__);
return -EINVAL;
}
ch = &diag_hsic[id];
if (!ch->enabled)
return -ENODEV;
if (ch->opened) {
pr_debug("diag: HSIC channel %d is already opened\n", ch->id);
return -ENODEV;
}
err = diag_bridge_open(ch->id, &diag_hsic_ops[ch->id]);
if (err) {
pr_err("diag: Unable to open HSIC channel %d, err: %d",
ch->id, err);
return err;
}
spin_lock_irqsave(&ch->lock, flags);
ch->opened = 1;
spin_unlock_irqrestore(&ch->lock, flags);
diagmem_init(driver, ch->mempool);
/* Notify the bridge that the channel is open */
diag_remote_dev_open(ch->dev_id);
queue_work(ch->hsic_wq, &(ch->read_work));
return 0;
}
static void hsic_open_work_fn(struct work_struct *work)
{
struct diag_hsic_info *ch = container_of(work, struct diag_hsic_info,
open_work);
if (ch)
hsic_open(ch->id);
}
static int hsic_close(int id)
{
unsigned long flags;
struct diag_hsic_info *ch = NULL;
if (id < 0 || id >= NUM_HSIC_DEV) {
pr_err("diag: Invalid index %d in %s\n", id, __func__);
return -EINVAL;
}
ch = &diag_hsic[id];
if (!ch->enabled)
return -ENODEV;
if (!ch->opened) {
pr_debug("diag: HSIC channel %d is already closed\n", ch->id);
return -ENODEV;
}
spin_lock_irqsave(&ch->lock, flags);
ch->opened = 0;
spin_unlock_irqrestore(&ch->lock, flags);
diag_bridge_close(ch->id);
diagmem_exit(driver, ch->mempool);
diag_remote_dev_close(ch->dev_id);
return 0;
}
static void hsic_close_work_fn(struct work_struct *work)
{
struct diag_hsic_info *ch = container_of(work, struct diag_hsic_info,
close_work);
if (ch)
hsic_close(ch->id);
}
static void hsic_read_work_fn(struct work_struct *work)
{
int err = 0;
unsigned char *buf = NULL;
struct diag_hsic_info *ch = container_of(work, struct diag_hsic_info,
read_work);
if (!ch || !ch->enabled || !ch->opened)
return;
do {
buf = diagmem_alloc(driver, DIAG_MDM_BUF_SIZE, ch->mempool);
if (!buf) {
err = -ENOMEM;
break;
}
err = diag_bridge_read(ch->id, buf, DIAG_MDM_BUF_SIZE);
if (err) {
diagmem_free(driver, buf, ch->mempool);
pr_err_ratelimited("diag: Unable to read from HSIC channel %d, err: %d\n",
ch->id, err);
break;
}
} while (buf);
/* Read from the HSIC channel continously if the channel is present */
if (!err)
queue_work(ch->hsic_wq, &ch->read_work);
}
static int diag_hsic_probe(struct platform_device *pdev)
{
unsigned long flags;
struct diag_hsic_info *ch = NULL;
if (!pdev)
return -EIO;
pr_debug("diag: hsic probe pdev: %d\n", pdev->id);
if (pdev->id >= NUM_HSIC_DEV) {
pr_err("diag: No support for HSIC device %d\n", pdev->id);
return -EIO;
}
ch = &diag_hsic[pdev->id];
if (!ch->enabled) {
spin_lock_irqsave(&ch->lock, flags);
ch->enabled = 1;
spin_unlock_irqrestore(&ch->lock, flags);
}
queue_work(ch->hsic_wq, &(ch->open_work));
return 0;
}
static int diag_hsic_remove(struct platform_device *pdev)
{
struct diag_hsic_info *ch = NULL;
if (!pdev)
return -EIO;
pr_debug("diag: hsic close pdev: %d\n", pdev->id);
if (pdev->id >= NUM_HSIC_DEV) {
pr_err("diag: No support for HSIC device %d\n", pdev->id);
return -EIO;
}
ch = &diag_hsic[pdev->id];
queue_work(ch->hsic_wq, &(ch->close_work));
return 0;
}
static int diagfwd_hsic_runtime_suspend(struct device *dev)
{
dev_dbg(dev, "pm_runtime: suspending...\n");
return 0;
}
static int diagfwd_hsic_runtime_resume(struct device *dev)
{
dev_dbg(dev, "pm_runtime: resuming...\n");
return 0;
}
static const struct dev_pm_ops diagfwd_hsic_dev_pm_ops = {
.runtime_suspend = diagfwd_hsic_runtime_suspend,
.runtime_resume = diagfwd_hsic_runtime_resume,
};
static struct platform_driver msm_hsic_ch_driver = {
.probe = diag_hsic_probe,
.remove = diag_hsic_remove,
.driver = {
.name = "diag_bridge",
.owner = THIS_MODULE,
.pm = &diagfwd_hsic_dev_pm_ops,
},
};
static int hsic_queue_read(int id)
{
if (id < 0 || id >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid index %d\n",
__func__, id);
return -EINVAL;
}
queue_work(diag_hsic[id].hsic_wq, &(diag_hsic[id].read_work));
return 0;
}
static int hsic_write(int id, unsigned char *buf, int len, int ctxt)
{
int err = 0;
struct diag_hsic_info *ch = NULL;
if (id < 0 || id >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid index %d\n",
__func__, id);
return -EINVAL;
}
if (!buf || len <= 0) {
pr_err_ratelimited("diag: In %s, ch %d, invalid buf %p len %d\n",
__func__, id, buf, len);
return -EINVAL;
}
ch = &diag_hsic[id];
if (!ch->opened || !ch->enabled) {
pr_debug_ratelimited("diag: In %s, ch %d is disabled. opened %d enabled: %d\n",
__func__, id, ch->opened, ch->enabled);
return -EIO;
}
err = diag_bridge_write(ch->id, buf, len);
if (err) {
pr_err_ratelimited("diag: cannot write to HSIC ch %d, err: %d\n",
ch->id, err);
}
return err;
}
static int hsic_fwd_complete(int id, unsigned char *buf, int len, int ctxt)
{
if (id < 0 || id >= NUM_HSIC_DEV) {
pr_err_ratelimited("diag: In %s, invalid index %d\n",
__func__, id);
return -EINVAL;
}
if (!buf)
return -EIO;
diagmem_free(driver, buf, diag_hsic[id].mempool);
queue_work(diag_hsic[id].hsic_wq, &(diag_hsic[id].read_work));
return 0;
}
static struct diag_remote_dev_ops diag_hsic_fwd_ops = {
.open = hsic_open,
.close = hsic_close,
.queue_read = hsic_queue_read,
.write = hsic_write,
.fwd_complete = hsic_fwd_complete,
};
int diag_hsic_init()
{
int i;
int err = 0;
struct diag_hsic_info *ch = NULL;
char wq_name[DIAG_HSIC_NAME_SZ + DIAG_HSIC_STRING_SZ];
for (i = 0; i < NUM_HSIC_DEV; i++) {
ch = &diag_hsic[i];
spin_lock_init(&ch->lock);
INIT_WORK(&(ch->read_work), hsic_read_work_fn);
INIT_WORK(&(ch->open_work), hsic_open_work_fn);
INIT_WORK(&(ch->close_work), hsic_close_work_fn);
strlcpy(wq_name, "DIAG_HSIC_", DIAG_HSIC_STRING_SZ);
strlcat(wq_name, ch->name, sizeof(ch->name));
ch->hsic_wq = create_singlethread_workqueue(wq_name);
if (!ch->hsic_wq)
goto fail;
err = diagfwd_bridge_register(ch->dev_id, ch->id,
&diag_hsic_fwd_ops);
if (err) {
pr_err("diag: Unable to register HSIC channel %d with bridge, err: %d\n",
i, err);
goto fail;
}
}
err = platform_driver_register(&msm_hsic_ch_driver);
if (err) {
pr_err("diag: could not register HSIC device, err: %d\n", err);
goto fail;
}
return 0;
fail:
diag_hsic_exit();
return -ENOMEM;
}
void diag_hsic_exit()
{
int i;
struct diag_hsic_info *ch = NULL;
for (i = 0; i < NUM_HSIC_DEV; i++) {
ch = &diag_hsic[i];
ch->enabled = 0;
ch->opened = 0;
ch->suspended = 0;
if (ch->hsic_wq)
destroy_workqueue(ch->hsic_wq);
}
platform_driver_unregister(&msm_hsic_ch_driver);
}