blob: e08843564708a69c38975a3b2ee2dd518e916020 [file] [log] [blame]
/* Copyright (c) 2012, 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.
*/
/* add additional information to our printk's */
#define pr_fmt(fmt) "%s: " fmt "\n", __func__
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/debugfs.h>
#include "hsic_sysmon.h"
#include "sysmon.h"
#define DRIVER_DESC "HSIC System monitor driver"
enum hsic_sysmon_op {
HSIC_SYSMON_OP_READ = 0,
HSIC_SYSMON_OP_WRITE,
NUM_OPS
};
struct hsic_sysmon {
struct usb_device *udev;
struct usb_interface *ifc;
__u8 in_epaddr;
__u8 out_epaddr;
unsigned int pipe[NUM_OPS];
struct kref kref;
struct platform_device pdev;
int id;
/* debugging counters */
atomic_t dbg_bytecnt[NUM_OPS];
atomic_t dbg_pending[NUM_OPS];
};
static struct hsic_sysmon *hsic_sysmon_devices[NUM_HSIC_SYSMON_DEVS];
static void hsic_sysmon_delete(struct kref *kref)
{
struct hsic_sysmon *hs = container_of(kref, struct hsic_sysmon, kref);
usb_put_dev(hs->udev);
hsic_sysmon_devices[hs->id] = NULL;
kfree(hs);
}
/**
* hsic_sysmon_open() - Opens the system monitor bridge.
* @id: the HSIC system monitor device to open
*
* This should only be called after the platform_device "sys_mon" with id
* SYSMON_SS_EXT_MODEM has been added. The simplest way to do that is to
* register a platform_driver and its probe will be called when the HSIC
* device is ready.
*/
int hsic_sysmon_open(enum hsic_sysmon_device_id id)
{
struct hsic_sysmon *hs;
if (id >= NUM_HSIC_SYSMON_DEVS) {
pr_err("invalid dev id(%d)", id);
return -ENODEV;
}
hs = hsic_sysmon_devices[id];
if (!hs) {
pr_err("dev is null");
return -ENODEV;
}
kref_get(&hs->kref);
return 0;
}
EXPORT_SYMBOL(hsic_sysmon_open);
/**
* hsic_sysmon_close() - Closes the system monitor bridge.
* @id: the HSIC system monitor device to close
*/
void hsic_sysmon_close(enum hsic_sysmon_device_id id)
{
struct hsic_sysmon *hs;
if (id >= NUM_HSIC_SYSMON_DEVS) {
pr_err("invalid dev id(%d)", id);
return;
}
hs = hsic_sysmon_devices[id];
kref_put(&hs->kref, hsic_sysmon_delete);
}
EXPORT_SYMBOL(hsic_sysmon_close);
/**
* hsic_sysmon_readwrite() - Common function to send read/write over HSIC
*/
static int hsic_sysmon_readwrite(enum hsic_sysmon_device_id id, void *data,
size_t len, size_t *actual_len, int timeout,
enum hsic_sysmon_op op)
{
struct hsic_sysmon *hs;
int ret;
const char *opstr = (op == HSIC_SYSMON_OP_READ) ?
"read" : "write";
pr_debug("%s: id:%d, data len:%d, timeout:%d", opstr, id, len, timeout);
if (id >= NUM_HSIC_SYSMON_DEVS) {
pr_err("invalid dev id(%d)", id);
return -ENODEV;
}
if (!len) {
pr_err("length(%d) must be greater than 0", len);
return -EINVAL;
}
hs = hsic_sysmon_devices[id];
if (!hs) {
pr_err("device was not opened");
return -ENODEV;
}
if (!hs->ifc) {
pr_err("can't %s, device disconnected", opstr);
return -ENODEV;
}
ret = usb_autopm_get_interface(hs->ifc);
if (ret < 0) {
dev_err(&hs->ifc->dev, "can't %s, autopm_get failed:%d\n",
opstr, ret);
return ret;
}
atomic_inc(&hs->dbg_pending[op]);
ret = usb_bulk_msg(hs->udev, hs->pipe[op], data, len, actual_len,
timeout);
atomic_dec(&hs->dbg_pending[op]);
if (ret)
dev_err(&hs->ifc->dev,
"can't %s, usb_bulk_msg failed, err:%d\n", opstr, ret);
else
atomic_add(*actual_len, &hs->dbg_bytecnt[op]);
usb_autopm_put_interface(hs->ifc);
return ret;
}
/**
* hsic_sysmon_read() - Read data from the HSIC sysmon interface.
* @id: the HSIC system monitor device to open
* @data: pointer to caller-allocated buffer to fill in
* @len: length in bytes of the buffer
* @actual_len: pointer to a location to put the actual length read
* in bytes
* @timeout: time in msecs to wait for the message to complete before
* timing out (if 0 the wait is forever)
*
* Context: !in_interrupt ()
*
* Synchronously reads data from the HSIC interface. The call will return
* after the read has completed, encountered an error, or timed out. Upon
* successful return actual_len will reflect the number of bytes read.
*
* If successful, it returns 0, otherwise a negative error number. The number
* of actual bytes transferred will be stored in the actual_len paramater.
*/
int hsic_sysmon_read(enum hsic_sysmon_device_id id, char *data, size_t len,
size_t *actual_len, int timeout)
{
return hsic_sysmon_readwrite(id, data, len, actual_len,
timeout, HSIC_SYSMON_OP_READ);
}
EXPORT_SYMBOL(hsic_sysmon_read);
/**
* hsic_sysmon_write() - Write data to the HSIC sysmon interface.
* @id: the HSIC system monitor device to open
* @data: pointer to caller-allocated buffer to write
* @len: length in bytes of the data in buffer to write
* @actual_len: pointer to a location to put the actual length written
* in bytes
* @timeout: time in msecs to wait for the message to complete before
* timing out (if 0 the wait is forever)
*
* Context: !in_interrupt ()
*
* Synchronously writes data to the HSIC interface. The call will return
* after the write has completed, encountered an error, or timed out. Upon
* successful return actual_len will reflect the number of bytes written.
*
* If successful, it returns 0, otherwise a negative error number. The number
* of actual bytes transferred will be stored in the actual_len paramater.
*/
int hsic_sysmon_write(enum hsic_sysmon_device_id id, const char *data,
size_t len, int timeout)
{
size_t actual_len;
return hsic_sysmon_readwrite(id, (void *)data, len, &actual_len,
timeout, HSIC_SYSMON_OP_WRITE);
}
EXPORT_SYMBOL(hsic_sysmon_write);
#if defined(CONFIG_DEBUG_FS)
#define DEBUG_BUF_SIZE 512
static ssize_t sysmon_debug_read_stats(struct file *file, char __user *ubuf,
size_t count, loff_t *ppos)
{
char *buf;
int i, ret = 0;
buf = kzalloc(sizeof(char) * DEBUG_BUF_SIZE, GFP_KERNEL);
if (!buf)
return -ENOMEM;
for (i = 0; i < NUM_HSIC_SYSMON_DEVS; i++) {
struct hsic_sysmon *hs = hsic_sysmon_devices[i];
if (!hs)
continue;
ret += scnprintf(buf, DEBUG_BUF_SIZE,
"---HSIC Sysmon #%d---\n"
"epin:%d, epout:%d\n"
"bytes to host: %d\n"
"bytes to mdm: %d\n"
"pending reads: %d\n"
"pending writes: %d\n",
i, hs->in_epaddr & ~0x80, hs->out_epaddr,
atomic_read(
&hs->dbg_bytecnt[HSIC_SYSMON_OP_READ]),
atomic_read(
&hs->dbg_bytecnt[HSIC_SYSMON_OP_WRITE]),
atomic_read(
&hs->dbg_pending[HSIC_SYSMON_OP_READ]),
atomic_read(
&hs->dbg_pending[HSIC_SYSMON_OP_WRITE])
);
}
ret = simple_read_from_buffer(ubuf, count, ppos, buf, ret);
kfree(buf);
return ret;
}
static ssize_t sysmon_debug_reset_stats(struct file *file,
const char __user *buf,
size_t count, loff_t *ppos)
{
int i;
for (i = 0; i < NUM_HSIC_SYSMON_DEVS; i++) {
struct hsic_sysmon *hs = hsic_sysmon_devices[i];
if (hs) {
atomic_set(&hs->dbg_bytecnt[HSIC_SYSMON_OP_READ], 0);
atomic_set(&hs->dbg_bytecnt[HSIC_SYSMON_OP_WRITE], 0);
atomic_set(&hs->dbg_pending[HSIC_SYSMON_OP_READ], 0);
atomic_set(&hs->dbg_pending[HSIC_SYSMON_OP_WRITE], 0);
}
}
return count;
}
const struct file_operations sysmon_stats_ops = {
.read = sysmon_debug_read_stats,
.write = sysmon_debug_reset_stats,
};
static struct dentry *dent;
static void hsic_sysmon_debugfs_init(void)
{
struct dentry *dfile;
dent = debugfs_create_dir("hsic_sysmon", 0);
if (IS_ERR(dent))
return;
dfile = debugfs_create_file("status", 0444, dent, 0, &sysmon_stats_ops);
if (!dfile || IS_ERR(dfile))
debugfs_remove(dent);
}
static void hsic_sysmon_debugfs_cleanup(void)
{
if (dent) {
debugfs_remove_recursive(dent);
dent = NULL;
}
}
#else
static inline void hsic_sysmon_debugfs_init(void) { }
static inline void hsic_sysmon_debugfs_cleanup(void) { }
#endif
static void hsic_sysmon_pdev_release(struct device *dev) { }
static int
hsic_sysmon_probe(struct usb_interface *ifc, const struct usb_device_id *id)
{
struct hsic_sysmon *hs;
struct usb_host_interface *ifc_desc;
struct usb_endpoint_descriptor *ep_desc;
int i;
int ret = -ENOMEM;
__u8 ifc_num;
pr_debug("id:%lu", id->driver_info);
ifc_num = ifc->cur_altsetting->desc.bInterfaceNumber;
/* is this the interface we're looking for? */
if (ifc_num != id->driver_info)
return -ENODEV;
hs = kzalloc(sizeof(*hs), GFP_KERNEL);
if (!hs) {
pr_err("unable to allocate hsic_sysmon");
return -ENOMEM;
}
hs->udev = usb_get_dev(interface_to_usbdev(ifc));
hs->ifc = ifc;
kref_init(&hs->kref);
ifc_desc = ifc->cur_altsetting;
for (i = 0; i < ifc_desc->desc.bNumEndpoints; i++) {
ep_desc = &ifc_desc->endpoint[i].desc;
if (!hs->in_epaddr && usb_endpoint_is_bulk_in(ep_desc)) {
hs->in_epaddr = ep_desc->bEndpointAddress;
hs->pipe[HSIC_SYSMON_OP_READ] =
usb_rcvbulkpipe(hs->udev, hs->in_epaddr);
}
if (!hs->out_epaddr && usb_endpoint_is_bulk_out(ep_desc)) {
hs->out_epaddr = ep_desc->bEndpointAddress;
hs->pipe[HSIC_SYSMON_OP_WRITE] =
usb_sndbulkpipe(hs->udev, hs->out_epaddr);
}
}
if (!(hs->in_epaddr && hs->out_epaddr)) {
pr_err("could not find bulk in and bulk out endpoints");
ret = -ENODEV;
goto error;
}
hs->id = HSIC_SYSMON_DEV_EXT_MODEM;
hsic_sysmon_devices[HSIC_SYSMON_DEV_EXT_MODEM] = hs;
usb_set_intfdata(ifc, hs);
hs->pdev.name = "sys_mon";
hs->pdev.id = SYSMON_SS_EXT_MODEM;
hs->pdev.dev.release = hsic_sysmon_pdev_release;
platform_device_register(&hs->pdev);
pr_debug("complete");
return 0;
error:
if (hs)
kref_put(&hs->kref, hsic_sysmon_delete);
return ret;
}
static void hsic_sysmon_disconnect(struct usb_interface *ifc)
{
struct hsic_sysmon *hs = usb_get_intfdata(ifc);
platform_device_unregister(&hs->pdev);
kref_put(&hs->kref, hsic_sysmon_delete);
usb_set_intfdata(ifc, NULL);
}
static int hsic_sysmon_suspend(struct usb_interface *ifc, pm_message_t message)
{
return 0;
}
static int hsic_sysmon_resume(struct usb_interface *ifc)
{
return 0;
}
/* driver_info maps to the interface number corresponding to sysmon */
static const struct usb_device_id hsic_sysmon_ids[] = {
{ USB_DEVICE(0x5c6, 0x9048), .driver_info = 1, },
{ USB_DEVICE(0x5c6, 0x904C), .driver_info = 1, },
{ USB_DEVICE(0x5c6, 0x9075), .driver_info = 1, },
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, hsic_sysmon_ids);
static struct usb_driver hsic_sysmon_driver = {
.name = "hsic_sysmon",
.probe = hsic_sysmon_probe,
.disconnect = hsic_sysmon_disconnect,
.suspend = hsic_sysmon_suspend,
.resume = hsic_sysmon_resume,
.id_table = hsic_sysmon_ids,
.supports_autosuspend = 1,
};
static int __init hsic_sysmon_init(void)
{
int ret;
ret = usb_register(&hsic_sysmon_driver);
if (ret) {
pr_err("unable to register " DRIVER_DESC);
return ret;
}
hsic_sysmon_debugfs_init();
return 0;
}
static void __exit hsic_sysmon_exit(void)
{
hsic_sysmon_debugfs_cleanup();
usb_deregister(&hsic_sysmon_driver);
}
module_init(hsic_sysmon_init);
module_exit(hsic_sysmon_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");