646 lines
15 KiB
C
646 lines
15 KiB
C
/* -*- linux-c -*- */
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/*
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* Driver for AW USB which is for downloading firmware
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*
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* Cesc
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* Changelog:
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*
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* */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/hardirq.h> //<linux/smp_lock.h>
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#include <linux/errno.h>
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#include <linux/random.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/usb.h>
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#include <linux/wait.h>
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/* by Cesc */
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#include <linux/ioctl.h>
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#include <linux/mutex.h> //?
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v0.5"
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#define DRIVER_AUTHOR "Jojo"
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#define DRIVER_DESC "AW USB driver"
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#define AW_MINOR 64
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/* stall/wait timeout for AWUSB */
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#define NAK_TIMEOUT (HZ)
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/* Size of the AW buffer */
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#define OBUF_SIZE 0x10000
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#define IBUF_SIZE 0x500
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#define MAX_TIME_WAIT 6000000
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#define USB_AW_VENDOR_ID 0x1f3a
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#define USB_AW_PRODUCT_ID 0xefe8
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struct allwinner_usb {
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struct usb_device *aw_dev; /* init: probe_aw */
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struct usb_interface *aw_intf; //store interface to get endpoint
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unsigned int ifnum; /* Interface number of the USB device */
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int isopen; /* nz if open */
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int present; /* Device is present on the bus */
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char *obuf, *ibuf; /* transfer buffers */
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size_t bulk_in_size; /* the size of the receive buffer */
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unsigned char bulk_in_endpointAddr; /* Endpoint assignments */
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unsigned char bulk_out_endpointAddr; /* Endpoint assignments */
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wait_queue_head_t wait_q; /* for timeouts */
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struct mutex lock; /* general race avoidance */
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};
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/* by Cesc */
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struct usb_param {
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unsigned test_num;
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unsigned p1; /* parameter 1 */
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unsigned p2;
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unsigned p3;
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};
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struct aw_command {
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int value;
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int length;
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void __user *buffer; //? by Cesc
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};
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#define AWUSB_IOC_MAGIC 's'
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#define AWUSB_IOCRESET _IO(AWUSB_IOC_MAGIC, 0)
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#define AWUSB_IOCSET _IOW(AWUSB_IOC_MAGIC, 1, struct usb_param)
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#define AWUSB_IOCGET _IOR(AWUSB_IOC_MAGIC, 2, struct usb_param)
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#define AWUSB_IOCSEND _IOW(AWUSB_IOC_MAGIC, 3, struct aw_command)
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#define AWUSB_IOCRECV _IOR(AWUSB_IOC_MAGIC, 4, struct aw_command)
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#define AWUSB_IOCSEND_RECV _IOWR(AWUSB_IOC_MAGIC, 5, struct aw_command) //how to implement it?
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/* table of devices that work with this driver */
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static const struct usb_device_id aw_table[] = {
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{ USB_DEVICE(USB_AW_VENDOR_ID, USB_AW_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, aw_table);
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static int probe_aw(struct usb_interface *intf,
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const struct usb_device_id *id);
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static void disconnect_aw(struct usb_interface *intf);
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static struct usb_driver aw_driver = {
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.name = "allwinner",
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.probe = probe_aw,
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.disconnect = disconnect_aw,
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.id_table = aw_table,
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};
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static struct allwinner_usb aw_instance;
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static int open_aw(struct inode *inode, struct file *file)
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{
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struct allwinner_usb *aw = &aw_instance;
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struct usb_interface* intf;// = aw->aw_intf;
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struct usb_host_interface *iface_desc;
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struct usb_endpoint_descriptor *endpoint;
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int subminor;
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int i;
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if (aw->isopen || !aw->present) {
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mutex_unlock(&(aw->lock));
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return -EBUSY;
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}
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subminor = iminor(inode);
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intf = usb_find_interface(&aw_driver, subminor);;
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if(intf == NULL)
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return -ENODEV;
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iface_desc = intf->cur_altsetting;
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aw->bulk_in_endpointAddr = 0;
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aw->bulk_out_endpointAddr = 0;
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for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
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endpoint = &iface_desc->endpoint[i].desc;
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if ( !aw->bulk_in_endpointAddr && usb_endpoint_is_bulk_in(endpoint)) {
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/* we found a bulk in endpoint */
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aw->bulk_in_endpointAddr = endpoint->bEndpointAddress;
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printk(KERN_DEBUG"bulk_in_endpointAddr = %d\n", endpoint->bEndpointAddress);
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}
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if ( !aw->bulk_out_endpointAddr && usb_endpoint_is_bulk_out(endpoint)) {
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/* we found a bulk out endpoint */
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aw->bulk_out_endpointAddr = endpoint->bEndpointAddress;
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printk(KERN_DEBUG"bulk_out_endpointAddr = %d\n", endpoint->bEndpointAddress);
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}
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}
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if (!(aw->bulk_in_endpointAddr && aw->bulk_out_endpointAddr)) {
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printk(KERN_ERR"Could not find both bulk-in and bulk-out endpoints");
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return -EPIPE;
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}
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aw->isopen = 1;
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init_waitqueue_head(&aw->wait_q);
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return 0;
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}
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static int close_aw(struct inode *inode, struct file *file)
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{
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struct allwinner_usb *aw = &aw_instance;
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aw->isopen = 0;
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return 0;
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}
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static long ioctl_aw(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct allwinner_usb *aw = &aw_instance;
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int retval=0;
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struct usb_param param_tmp;
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struct aw_command aw_cmd;
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void __user *data;
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int value = 0;
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int buffer_len = 0;
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int result = 0;
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int actual_len = 0;
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unsigned int nPipe = 0;
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mutex_lock(&(aw->lock));
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if (aw->present == 0 || aw->aw_dev == NULL) {
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retval = -ENODEV;
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goto err_out;
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}
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param_tmp.test_num = 0;
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param_tmp.p1 = 0;
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param_tmp.p2 = 0;
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param_tmp.p3 = 0;
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switch (cmd) {
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case AWUSB_IOCRESET:
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printk(KERN_DEBUG"ioctl_aw--AWUSB_IOCRESET\n");
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break;
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case AWUSB_IOCSET:
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if (copy_from_user(¶m_tmp, (void __user *)arg, sizeof(param_tmp)))
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retval= -EFAULT;
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printk(KERN_DEBUG"param_tmp.test_num = %d\n", param_tmp.test_num);
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printk(KERN_DEBUG"param_tmp.p1 = %d\n", param_tmp.p1);
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printk(KERN_DEBUG"param_tmp.p2 = %d\n", param_tmp.p2);
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printk(KERN_DEBUG"param_tmp.p3 = %d\n", param_tmp.p3);
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break;
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case AWUSB_IOCGET:
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param_tmp.test_num = 3;
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param_tmp.p1 = 4;
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param_tmp.p2 = 5;
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param_tmp.p3 = 6;
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if (copy_to_user((void __user *)arg, ¶m_tmp, sizeof(param_tmp)))
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retval= -EFAULT;
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break;
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case AWUSB_IOCSEND:
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data = (void __user *) arg;
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if (data == NULL)
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break;
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if (copy_from_user(&aw_cmd, data, sizeof(struct aw_command))) {
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retval = -EFAULT;
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goto err_out;
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}
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buffer_len = aw_cmd.length;
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value = aw_cmd.value;
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if (buffer_len > OBUF_SIZE) {
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retval = - EINVAL;
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goto err_out;
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}
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// stage 1, get data from app
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if (copy_from_user(aw->obuf, aw_cmd.buffer, aw_cmd.length)) {
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retval = -EFAULT;
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goto err_out;
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}
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//stage 2, send data to usb device
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nPipe = usb_sndbulkpipe(aw->aw_dev, aw->bulk_out_endpointAddr);
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result = usb_bulk_msg(aw->aw_dev, nPipe,
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aw->obuf, buffer_len, &actual_len, MAX_TIME_WAIT);
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if (result) {
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printk(KERN_ERR"Write Whoops - %d", (int)result);
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printk(KERN_ERR"send pipe - %u", nPipe);
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retval = result;
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goto err_out;
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}
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break;
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case AWUSB_IOCRECV:
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data = (void __user *) arg;
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if (data == NULL)
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break;
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if (copy_from_user(&aw_cmd,data, sizeof(struct aw_command))) {
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retval = -EFAULT;
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goto err_out;
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}
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if (aw_cmd.length < 0) {
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retval = - EINVAL;
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goto err_out;
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}
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buffer_len = aw_cmd.length;
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value = aw_cmd.value;
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if (buffer_len > aw->bulk_in_size) {
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retval = - EINVAL;
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goto err_out;
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}
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memset(aw->ibuf, 0x00, aw->bulk_in_size);
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// stage 1, get data from usb device
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nPipe = usb_rcvbulkpipe(aw->aw_dev, aw->bulk_in_endpointAddr);
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result = usb_bulk_msg(aw->aw_dev, nPipe,
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aw->ibuf, buffer_len, &actual_len, MAX_TIME_WAIT);
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if (result) {
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printk(KERN_ERR"Read Whoops - %d", result);
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printk(KERN_ERR"Receive pipe - %u", nPipe);
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retval = result;
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goto err_out;
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}
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// stage 2, copy data to app in user space
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if (copy_to_user(aw_cmd.buffer, aw->ibuf, aw_cmd.length)) {
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retval = - EFAULT;
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goto err_out;
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}
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break;
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case AWUSB_IOCSEND_RECV:
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printk(KERN_DEBUG"ioctl_aw--AWUSB_IOCSEND_RECV\n");
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break;
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default:
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retval = -ENOTTY;
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break;
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}
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err_out:
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mutex_unlock(&(aw->lock));
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return retval;
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}
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static ssize_t
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write_aw(struct file *file, const char __user *buffer,
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size_t count, loff_t * ppos)
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{
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DEFINE_WAIT(wait);
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struct allwinner_usb *aw = &aw_instance;
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unsigned long copy_size;
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unsigned long bytes_written = 0;
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unsigned int partial;
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int result = 0;
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int maxretry;
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int errn = 0;
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int intr;
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intr = mutex_lock_interruptible(&(aw->lock));
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if (intr)
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return -EINTR;
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/* Sanity check to make sure aw is connected, powered, etc */
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if (aw->present == 0 || aw->aw_dev == NULL) {
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mutex_unlock(&(aw->lock));
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return -ENODEV;
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}
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do {
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unsigned long thistime;
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char *obuf = aw->obuf;
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thistime = copy_size =
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(count >= OBUF_SIZE) ? OBUF_SIZE : count;
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if (copy_from_user(aw->obuf, buffer, copy_size)) {
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errn = -EFAULT;
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goto error;
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}
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maxretry = 5;
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while (thistime) {
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if (!aw->aw_dev) {
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errn = -ENODEV;
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goto error;
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}
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if (signal_pending(current)) {
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mutex_unlock(&(aw->lock));
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return bytes_written ? bytes_written : -EINTR;
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}
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result = usb_bulk_msg(aw->aw_dev,
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usb_sndbulkpipe(aw->aw_dev, aw->bulk_out_endpointAddr),
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obuf, thistime, &partial, MAX_TIME_WAIT);
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printk(KERN_DEBUG"write stats: result:%d thistime:%lu partial:%u",
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result, thistime, partial);
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if (result == -ETIMEDOUT) { /* NAK - so hold for a while */
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if (!maxretry--) {
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errn = -ETIME;
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goto error;
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}
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prepare_to_wait(&aw->wait_q, &wait, TASK_INTERRUPTIBLE);
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schedule_timeout(NAK_TIMEOUT);
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finish_wait(&aw->wait_q, &wait);
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continue;
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} else if (!result && partial) {
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obuf += partial;
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thistime -= partial;
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} else
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break;
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};
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if (result) {
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printk(KERN_ERR"Write Whoops - %x", result);
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errn = -EIO;
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goto error;
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}
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bytes_written += copy_size;
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count -= copy_size;
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buffer += copy_size;
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} while (count > 0);
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mutex_unlock(&(aw->lock));
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return bytes_written ? bytes_written : -EIO;
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error:
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mutex_unlock(&(aw->lock));
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return errn;
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}
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static ssize_t
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read_aw(struct file *file, char __user *buffer, size_t count, loff_t * ppos)
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{
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DEFINE_WAIT(wait);
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struct allwinner_usb *aw = &aw_instance;
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ssize_t read_count;
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unsigned int partial;
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int this_read;
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int result;
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int maxretry = 10;
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char *ibuf;
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int intr;
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intr = mutex_lock_interruptible(&(aw->lock));
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if (intr)
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return -EINTR;
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/* Sanity check to make sure aw is connected, powered, etc */
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if (aw->present == 0 || aw->aw_dev == NULL) {
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mutex_unlock(&(aw->lock));
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return -ENODEV;
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}
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ibuf = aw->ibuf;
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read_count = 0;
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while (count > 0) {
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if (signal_pending(current)) {
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mutex_unlock(&(aw->lock));
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return read_count ? read_count : -EINTR;
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}
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if (!aw->aw_dev) {
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mutex_unlock(&(aw->lock));
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return -ENODEV;
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}
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this_read = (count >= aw->bulk_in_size) ? aw->bulk_in_size : count;
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result = usb_bulk_msg(aw->aw_dev,
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usb_rcvbulkpipe(aw->aw_dev, aw->bulk_in_endpointAddr),
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ibuf, this_read, &partial,
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MAX_TIME_WAIT);
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printk(KERN_DEBUG"read stats: result:%d this_read:%u partial:%u",
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result, this_read, partial);
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if (partial) {
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count = this_read = partial;
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} else if (result == -ETIMEDOUT || result == 15) { /* FIXME: 15 ??? */
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if (!maxretry--) {
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mutex_unlock(&(aw->lock));
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printk(KERN_ERR"read_aw: maxretry timeout");
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return -ETIME;
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}
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prepare_to_wait(&aw->wait_q, &wait, TASK_INTERRUPTIBLE);
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schedule_timeout(NAK_TIMEOUT);
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finish_wait(&aw->wait_q, &wait);
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continue;
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} else if (result != -EREMOTEIO) {
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mutex_unlock(&(aw->lock));
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printk(KERN_ERR"Read Whoops - result:%u partial:%u this_read:%u",
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result, partial, this_read);
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return -EIO;
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} else {
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mutex_unlock(&(aw->lock));
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return (0);
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}
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if (this_read) {
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if (copy_to_user(buffer, ibuf, this_read)) {
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mutex_unlock(&(aw->lock));
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return -EFAULT;
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}
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count -= this_read;
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read_count += this_read;
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buffer += this_read;
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}
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}
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mutex_unlock(&(aw->lock));
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return read_count;
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}
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static const struct file_operations usb_aw_fops = {
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.owner = THIS_MODULE,
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.read = read_aw,
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.write = write_aw,
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.unlocked_ioctl = ioctl_aw,
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.open = open_aw,
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.release = close_aw,
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};
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static struct usb_class_driver usb_aw_class = {
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.name = "aw_efex%d",
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.fops = &usb_aw_fops,
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.minor_base = AW_MINOR,
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};
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static int probe_aw(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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struct allwinner_usb *aw = &aw_instance;
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int retval;
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#if 0
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struct usb_host_interface *iface_desc;
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struct usb_endpoint_descriptor *endpoint;
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size_t buffer_size;
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int i;
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iface_desc = intf->cur_altsetting;
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for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
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endpoint = &iface_desc->endpoint[i].desc;
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if (!aw->bulk_in_endpointAddr &&
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usb_endpoint_is_bulk_in(endpoint)) {
|
|
/* we found a bulk in endpoint */
|
|
buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
|
|
aw->bulk_in_size = IBUF_SIZE;
|
|
aw->bulk_in_endpointAddr = endpoint->bEndpointAddress;
|
|
printk(KERN_DEBUG"bulk_in_endpointAddr = %d\n", endpoint->bEndpointAddress);
|
|
}
|
|
|
|
if (!aw->bulk_out_endpointAddr &&
|
|
usb_endpoint_is_bulk_out(endpoint)) {
|
|
/* we found a bulk out endpoint */
|
|
aw->bulk_out_endpointAddr = endpoint->bEndpointAddress;
|
|
printk(KERN_DEBUG"bulk_out_endpointAddr = %d\n", endpoint->bEndpointAddress);
|
|
}
|
|
}
|
|
if (!(aw->bulk_in_endpointAddr && aw->bulk_out_endpointAddr)) {
|
|
err("Could not find both bulk-in and bulk-out endpoints");
|
|
return -EPIPE;
|
|
}
|
|
|
|
#endif
|
|
retval = usb_register_dev(intf, &usb_aw_class);
|
|
if (retval) {
|
|
printk(KERN_ERR"Not able to get a minor for this device.");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
aw->aw_dev = dev;
|
|
aw->aw_intf = intf;
|
|
aw->bulk_in_size = IBUF_SIZE;
|
|
|
|
if (!(aw->obuf = kmalloc(OBUF_SIZE, GFP_KERNEL))) {
|
|
printk(KERN_ERR"probe_aw: Not enough memory for the output buffer");
|
|
usb_deregister_dev(intf, &usb_aw_class);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (!(aw->ibuf = kmalloc(aw->bulk_in_size, GFP_KERNEL))) {
|
|
printk(KERN_ERR"probe_aw: Not enough memory for the input buffer");
|
|
usb_deregister_dev(intf, &usb_aw_class);
|
|
kfree(aw->obuf);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
mutex_init(&(aw->lock));
|
|
|
|
usb_set_intfdata (intf, aw);
|
|
aw->present = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void disconnect_aw(struct usb_interface *intf)
|
|
{
|
|
struct allwinner_usb *aw = usb_get_intfdata (intf);
|
|
|
|
usb_set_intfdata (intf, NULL);
|
|
if (aw) {
|
|
usb_deregister_dev(intf, &usb_aw_class);
|
|
|
|
mutex_lock(&(aw->lock));
|
|
if (aw->isopen) {
|
|
aw->isopen = 0;
|
|
/* better let it finish - the release will do whats needed */
|
|
aw->aw_dev = NULL;
|
|
mutex_unlock(&(aw->lock));
|
|
return;
|
|
}
|
|
kfree(aw->ibuf);
|
|
kfree(aw->obuf);
|
|
|
|
dev_info(&intf->dev, "USB aw disconnected.\n");
|
|
|
|
aw->present = 0;
|
|
mutex_unlock(&(aw->lock));
|
|
}
|
|
}
|
|
|
|
static int __init usb_aw_init(void)
|
|
{
|
|
int retval;
|
|
retval = usb_register(&aw_driver);
|
|
if (retval)
|
|
goto out;
|
|
|
|
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
|
|
DRIVER_DESC "\n");
|
|
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
|
|
static void __exit usb_aw_cleanup(void)
|
|
{
|
|
struct allwinner_usb *aw = &aw_instance;
|
|
|
|
aw->present = 0;
|
|
usb_deregister(&aw_driver);
|
|
|
|
|
|
}
|
|
|
|
module_init(usb_aw_init);
|
|
module_exit(usb_aw_cleanup);
|
|
|
|
MODULE_AUTHOR( DRIVER_AUTHOR );
|
|
MODULE_DESCRIPTION( DRIVER_DESC );
|
|
MODULE_LICENSE("GPL");
|
|
|