drivers/staging/go7007/s2250-loader.c

   1 /*
   2  * Copyright (C) 2008 Sensoray Company Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License (Version 2) as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/usb.h>
  21 #include <dvb-usb.h>
  22
  23 #define S2250_LOADER_FIRMWARE   "s2250_loader.fw"
  24 #define S2250_FIRMWARE          "s2250.fw"
  25
  26 typedef struct device_extension_s {
  27     struct kref     kref;
  28     int minor;
  29     struct usb_device *usbdev;
  30 } device_extension_t, *pdevice_extension_t;
  31
  32 #define USB_s2250loader_MAJOR 240
  33 #define USB_s2250loader_MINOR_BASE 0
  34 #define MAX_DEVICES 256
  35
  36 static pdevice_extension_t s2250_dev_table[MAX_DEVICES];
  37 static DECLARE_MUTEX(s2250_dev_table_mutex);
  38
  39 #define to_s2250loader_dev_common(d) container_of(d, device_extension_t, kref)
  40 static void s2250loader_delete(struct kref *kref)
  41 {
  42         pdevice_extension_t s = to_s2250loader_dev_common(kref);
  43         s2250_dev_table[s->minor] = NULL;
  44         kfree(s);
  45 }
  46
  47 static int s2250loader_probe(struct usb_interface *interface,
  48                                 const struct usb_device_id *id)
  49 {
  50         struct usb_device *usbdev;
  51         int minor, ret;
  52         pdevice_extension_t s = NULL;
  53         const struct firmware *fw;
  54
  55         usbdev = usb_get_dev(interface_to_usbdev(interface));
  56         if (!usbdev) {
  57                 printk(KERN_ERR "Enter s2250loader_probe failed\n");
  58                 return -1;
  59         }
  60         printk(KERN_INFO "Enter s2250loader_probe 2.6 kernel\n");
  61         printk(KERN_INFO "vendor id 0x%x, device id 0x%x devnum:%d\n",
  62            usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
  63            usbdev->devnum);
  64
  65         if (usbdev->descriptor.bNumConfigurations != 1) {
  66                 printk(KERN_ERR "can't handle multiple config\n");
  67                 return -1;
  68         }
  69         down(&s2250_dev_table_mutex);
  70
  71         for (minor = 0; minor < MAX_DEVICES; minor++) {
  72                 if (s2250_dev_table[minor] == NULL)
  73                         break;
  74         }
  75
  76         if (minor < 0 || minor >= MAX_DEVICES) {
  77                 printk(KERN_ERR "Invalid minor: %d\n", minor);
  78                 goto failed;
  79         }
  80
  81         /* Allocate dev data structure */
  82         s = kmalloc(sizeof(device_extension_t), GFP_KERNEL);
  83         if (s == NULL) {
  84                 printk(KERN_ERR "Out of memory\n");
  85                 goto failed;
  86         }
  87         s2250_dev_table[minor] = s;
  88
  89         printk(KERN_INFO "s2250loader_probe: Device %d on Bus %d Minor %d\n",
  90                 usbdev->devnum, usbdev->bus->busnum, minor);
  91
  92         memset(s, 0, sizeof(device_extension_t));
  93         s->usbdev = usbdev;
  94         printk(KERN_INFO "loading 2250 loader\n");
  95
  96         kref_init(&(s->kref));
  97
  98         up(&s2250_dev_table_mutex);
  99
 100         if (request_firmware(&fw, S2250_LOADER_FIRMWARE, &usbdev->dev)) {
 101                 printk(KERN_ERR
 102                         "s2250: unable to load firmware from file \"%s\"\n",
 103                         S2250_LOADER_FIRMWARE);
 104                 goto failed2;
 105         }
 106         ret = usb_cypress_load_firmware(usbdev, fw, CYPRESS_FX2);
 107         release_firmware(fw);
 108         if (0 != ret) {
 109                 printk(KERN_ERR "loader download failed\n");
 110                 goto failed2;
 111         }
 112
 113         if (request_firmware(&fw, S2250_FIRMWARE, &usbdev->dev)) {
 114                 printk(KERN_ERR
 115                         "s2250: unable to load firmware from file \"%s\"\n",
 116                         S2250_FIRMWARE);
 117                 goto failed2;
 118         }
 119         ret = usb_cypress_load_firmware(usbdev, fw, CYPRESS_FX2);
 120         release_firmware(fw);
 121         if (0 != ret) {
 122                 printk(KERN_ERR "firmware_s2250 download failed\n");
 123                 goto failed2;
 124         }
 125
 126         usb_set_intfdata(interface, s);
 127         return 0;
 128
 129 failed:
 130         up(&s2250_dev_table_mutex);
 131 failed2:
 132         if (s)
 133                 kref_put(&(s->kref), s2250loader_delete);
 134
 135         printk(KERN_ERR "probe failed\n");
 136         return -1;
 137 }
 138
 139 static void s2250loader_disconnect(struct usb_interface *interface)
 140 {
 141         pdevice_extension_t s = usb_get_intfdata(interface);
 142         printk(KERN_INFO "s2250: disconnect\n");
 143         lock_kernel();
 144         s = usb_get_intfdata(interface);
 145         usb_set_intfdata(interface, NULL);
 146         kref_put(&(s->kref), s2250loader_delete);
 147         unlock_kernel();
 148 }
 149
 150 static struct usb_device_id s2250loader_ids[] = {
 151         {USB_DEVICE(0x1943, 0xa250)},
 152         {}                          /* Terminating entry */
 153 };
 154
 155 MODULE_DEVICE_TABLE(usb, s2250loader_ids);
 156
 157 static struct usb_driver s2250loader_driver = {
 158         .name           = "s2250-loader",
 159         .probe          = s2250loader_probe,
 160         .disconnect     = s2250loader_disconnect,
 161         .id_table       = s2250loader_ids,
 162 };
 163
 164 int s2250loader_init(void)
 165 {
 166         int r;
 167         unsigned i = 0;
 168
 169         for (i = 0; i < MAX_DEVICES; i++)
 170                 s2250_dev_table[i] = NULL;
 171
 172         r = usb_register(&s2250loader_driver);
 173         if (r) {
 174                 printk(KERN_ERR "usb_register failed. Error number %d\n", r);
 175                 return -1;
 176         }
 177
 178         printk(KERN_INFO "s2250loader_init: driver registered\n");
 179         return 0;
 180 }
 181 EXPORT_SYMBOL(s2250loader_init);
 182
 183 void s2250loader_cleanup(void)
 184 {
 185         printk(KERN_INFO "s2250loader_cleanup\n");
 186         usb_deregister(&s2250loader_driver);
 187 }
 188 EXPORT_SYMBOL(s2250loader_cleanup);