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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Abilis Systems Single DVB-T Receiver
0004  * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
0005  * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
0006  */
0007 #include <linux/kernel.h>
0008 #include <linux/errno.h>
0009 #include <linux/slab.h>
0010 #include <linux/mm.h>
0011 #include <linux/usb.h>
0012 
0013 #include "as102_drv.h"
0014 #include "as102_usb_drv.h"
0015 #include "as102_fw.h"
0016 
0017 static void as102_usb_disconnect(struct usb_interface *interface);
0018 static int as102_usb_probe(struct usb_interface *interface,
0019                const struct usb_device_id *id);
0020 
0021 static int as102_usb_start_stream(struct as102_dev_t *dev);
0022 static void as102_usb_stop_stream(struct as102_dev_t *dev);
0023 
0024 static int as102_open(struct inode *inode, struct file *file);
0025 static int as102_release(struct inode *inode, struct file *file);
0026 
0027 static const struct usb_device_id as102_usb_id_table[] = {
0028     { USB_DEVICE(AS102_USB_DEVICE_VENDOR_ID, AS102_USB_DEVICE_PID_0001) },
0029     { USB_DEVICE(PCTV_74E_USB_VID, PCTV_74E_USB_PID) },
0030     { USB_DEVICE(ELGATO_EYETV_DTT_USB_VID, ELGATO_EYETV_DTT_USB_PID) },
0031     { USB_DEVICE(NBOX_DVBT_DONGLE_USB_VID, NBOX_DVBT_DONGLE_USB_PID) },
0032     { USB_DEVICE(SKY_IT_DIGITAL_KEY_USB_VID, SKY_IT_DIGITAL_KEY_USB_PID) },
0033     { } /* Terminating entry */
0034 };
0035 
0036 /* Note that this table must always have the same number of entries as the
0037    as102_usb_id_table struct */
0038 static const char * const as102_device_names[] = {
0039     AS102_REFERENCE_DESIGN,
0040     AS102_PCTV_74E,
0041     AS102_ELGATO_EYETV_DTT_NAME,
0042     AS102_NBOX_DVBT_DONGLE_NAME,
0043     AS102_SKY_IT_DIGITAL_KEY_NAME,
0044     NULL /* Terminating entry */
0045 };
0046 
0047 /* eLNA configuration: devices built on the reference design work best
0048    with 0xA0, while custom designs seem to require 0xC0 */
0049 static uint8_t const as102_elna_cfg[] = {
0050     0xA0,
0051     0xC0,
0052     0xC0,
0053     0xA0,
0054     0xA0,
0055     0x00 /* Terminating entry */
0056 };
0057 
0058 struct usb_driver as102_usb_driver = {
0059     .name       = DRIVER_FULL_NAME,
0060     .probe      = as102_usb_probe,
0061     .disconnect = as102_usb_disconnect,
0062     .id_table   = as102_usb_id_table
0063 };
0064 
0065 static const struct file_operations as102_dev_fops = {
0066     .owner      = THIS_MODULE,
0067     .open       = as102_open,
0068     .release    = as102_release,
0069 };
0070 
0071 static struct usb_class_driver as102_usb_class_driver = {
0072     .name       = "aton2-%d",
0073     .fops       = &as102_dev_fops,
0074     .minor_base = AS102_DEVICE_MAJOR,
0075 };
0076 
0077 static int as102_usb_xfer_cmd(struct as10x_bus_adapter_t *bus_adap,
0078                   unsigned char *send_buf, int send_buf_len,
0079                   unsigned char *recv_buf, int recv_buf_len)
0080 {
0081     int ret = 0;
0082 
0083     if (send_buf != NULL) {
0084         ret = usb_control_msg(bus_adap->usb_dev,
0085                       usb_sndctrlpipe(bus_adap->usb_dev, 0),
0086                       AS102_USB_DEVICE_TX_CTRL_CMD,
0087                       USB_DIR_OUT | USB_TYPE_VENDOR |
0088                       USB_RECIP_DEVICE,
0089                       bus_adap->cmd_xid, /* value */
0090                       0, /* index */
0091                       send_buf, send_buf_len,
0092                       USB_CTRL_SET_TIMEOUT /* 200 */);
0093         if (ret < 0) {
0094             dev_dbg(&bus_adap->usb_dev->dev,
0095                 "usb_control_msg(send) failed, err %i\n", ret);
0096             return ret;
0097         }
0098 
0099         if (ret != send_buf_len) {
0100             dev_dbg(&bus_adap->usb_dev->dev,
0101             "only wrote %d of %d bytes\n", ret, send_buf_len);
0102             return -1;
0103         }
0104     }
0105 
0106     if (recv_buf != NULL) {
0107 #ifdef TRACE
0108         dev_dbg(bus_adap->usb_dev->dev,
0109             "want to read: %d bytes\n", recv_buf_len);
0110 #endif
0111         ret = usb_control_msg(bus_adap->usb_dev,
0112                       usb_rcvctrlpipe(bus_adap->usb_dev, 0),
0113                       AS102_USB_DEVICE_RX_CTRL_CMD,
0114                       USB_DIR_IN | USB_TYPE_VENDOR |
0115                       USB_RECIP_DEVICE,
0116                       bus_adap->cmd_xid, /* value */
0117                       0, /* index */
0118                       recv_buf, recv_buf_len,
0119                       USB_CTRL_GET_TIMEOUT /* 200 */);
0120         if (ret < 0) {
0121             dev_dbg(&bus_adap->usb_dev->dev,
0122                 "usb_control_msg(recv) failed, err %i\n", ret);
0123             return ret;
0124         }
0125 #ifdef TRACE
0126         dev_dbg(bus_adap->usb_dev->dev,
0127             "read %d bytes\n", recv_buf_len);
0128 #endif
0129     }
0130 
0131     return ret;
0132 }
0133 
0134 static int as102_send_ep1(struct as10x_bus_adapter_t *bus_adap,
0135               unsigned char *send_buf,
0136               int send_buf_len,
0137               int swap32)
0138 {
0139     int ret, actual_len;
0140 
0141     ret = usb_bulk_msg(bus_adap->usb_dev,
0142                usb_sndbulkpipe(bus_adap->usb_dev, 1),
0143                send_buf, send_buf_len, &actual_len, 200);
0144     if (ret) {
0145         dev_dbg(&bus_adap->usb_dev->dev,
0146             "usb_bulk_msg(send) failed, err %i\n", ret);
0147         return ret;
0148     }
0149 
0150     if (actual_len != send_buf_len) {
0151         dev_dbg(&bus_adap->usb_dev->dev, "only wrote %d of %d bytes\n",
0152             actual_len, send_buf_len);
0153         return -1;
0154     }
0155     return actual_len;
0156 }
0157 
0158 static int as102_read_ep2(struct as10x_bus_adapter_t *bus_adap,
0159            unsigned char *recv_buf, int recv_buf_len)
0160 {
0161     int ret, actual_len;
0162 
0163     if (recv_buf == NULL)
0164         return -EINVAL;
0165 
0166     ret = usb_bulk_msg(bus_adap->usb_dev,
0167                usb_rcvbulkpipe(bus_adap->usb_dev, 2),
0168                recv_buf, recv_buf_len, &actual_len, 200);
0169     if (ret) {
0170         dev_dbg(&bus_adap->usb_dev->dev,
0171             "usb_bulk_msg(recv) failed, err %i\n", ret);
0172         return ret;
0173     }
0174 
0175     if (actual_len != recv_buf_len) {
0176         dev_dbg(&bus_adap->usb_dev->dev, "only read %d of %d bytes\n",
0177             actual_len, recv_buf_len);
0178         return -1;
0179     }
0180     return actual_len;
0181 }
0182 
0183 static const struct as102_priv_ops_t as102_priv_ops = {
0184     .upload_fw_pkt  = as102_send_ep1,
0185     .xfer_cmd   = as102_usb_xfer_cmd,
0186     .as102_read_ep2 = as102_read_ep2,
0187     .start_stream   = as102_usb_start_stream,
0188     .stop_stream    = as102_usb_stop_stream,
0189 };
0190 
0191 static int as102_submit_urb_stream(struct as102_dev_t *dev, struct urb *urb)
0192 {
0193     int err;
0194 
0195     usb_fill_bulk_urb(urb,
0196               dev->bus_adap.usb_dev,
0197               usb_rcvbulkpipe(dev->bus_adap.usb_dev, 0x2),
0198               urb->transfer_buffer,
0199               AS102_USB_BUF_SIZE,
0200               as102_urb_stream_irq,
0201               dev);
0202 
0203     err = usb_submit_urb(urb, GFP_ATOMIC);
0204     if (err)
0205         dev_dbg(&urb->dev->dev,
0206             "%s: usb_submit_urb failed\n", __func__);
0207 
0208     return err;
0209 }
0210 
0211 void as102_urb_stream_irq(struct urb *urb)
0212 {
0213     struct as102_dev_t *as102_dev = urb->context;
0214 
0215     if (urb->actual_length > 0) {
0216         dvb_dmx_swfilter(&as102_dev->dvb_dmx,
0217                  urb->transfer_buffer,
0218                  urb->actual_length);
0219     } else {
0220         if (urb->actual_length == 0)
0221             memset(urb->transfer_buffer, 0, AS102_USB_BUF_SIZE);
0222     }
0223 
0224     /* is not stopped, re-submit urb */
0225     if (as102_dev->streaming)
0226         as102_submit_urb_stream(as102_dev, urb);
0227 }
0228 
0229 static void as102_free_usb_stream_buffer(struct as102_dev_t *dev)
0230 {
0231     int i;
0232 
0233     for (i = 0; i < MAX_STREAM_URB; i++)
0234         usb_free_urb(dev->stream_urb[i]);
0235 
0236     usb_free_coherent(dev->bus_adap.usb_dev,
0237             MAX_STREAM_URB * AS102_USB_BUF_SIZE,
0238             dev->stream,
0239             dev->dma_addr);
0240 }
0241 
0242 static int as102_alloc_usb_stream_buffer(struct as102_dev_t *dev)
0243 {
0244     int i;
0245 
0246     dev->stream = usb_alloc_coherent(dev->bus_adap.usb_dev,
0247                        MAX_STREAM_URB * AS102_USB_BUF_SIZE,
0248                        GFP_KERNEL,
0249                        &dev->dma_addr);
0250     if (!dev->stream) {
0251         dev_dbg(&dev->bus_adap.usb_dev->dev,
0252             "%s: usb_buffer_alloc failed\n", __func__);
0253         return -ENOMEM;
0254     }
0255 
0256     memset(dev->stream, 0, MAX_STREAM_URB * AS102_USB_BUF_SIZE);
0257 
0258     /* init urb buffers */
0259     for (i = 0; i < MAX_STREAM_URB; i++) {
0260         struct urb *urb;
0261 
0262         urb = usb_alloc_urb(0, GFP_ATOMIC);
0263         if (urb == NULL) {
0264             as102_free_usb_stream_buffer(dev);
0265             return -ENOMEM;
0266         }
0267 
0268         urb->transfer_buffer = dev->stream + (i * AS102_USB_BUF_SIZE);
0269         urb->transfer_dma = dev->dma_addr + (i * AS102_USB_BUF_SIZE);
0270         urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
0271         urb->transfer_buffer_length = AS102_USB_BUF_SIZE;
0272 
0273         dev->stream_urb[i] = urb;
0274     }
0275     return 0;
0276 }
0277 
0278 static void as102_usb_stop_stream(struct as102_dev_t *dev)
0279 {
0280     int i;
0281 
0282     for (i = 0; i < MAX_STREAM_URB; i++)
0283         usb_kill_urb(dev->stream_urb[i]);
0284 }
0285 
0286 static int as102_usb_start_stream(struct as102_dev_t *dev)
0287 {
0288     int i, ret = 0;
0289 
0290     for (i = 0; i < MAX_STREAM_URB; i++) {
0291         ret = as102_submit_urb_stream(dev, dev->stream_urb[i]);
0292         if (ret) {
0293             as102_usb_stop_stream(dev);
0294             return ret;
0295         }
0296     }
0297 
0298     return 0;
0299 }
0300 
0301 static void as102_usb_release(struct kref *kref)
0302 {
0303     struct as102_dev_t *as102_dev;
0304 
0305     as102_dev = container_of(kref, struct as102_dev_t, kref);
0306     if (as102_dev != NULL) {
0307         usb_put_dev(as102_dev->bus_adap.usb_dev);
0308         kfree(as102_dev);
0309     }
0310 }
0311 
0312 static void as102_usb_disconnect(struct usb_interface *intf)
0313 {
0314     struct as102_dev_t *as102_dev;
0315 
0316     /* extract as102_dev_t from usb_device private data */
0317     as102_dev = usb_get_intfdata(intf);
0318 
0319     /* unregister dvb layer */
0320     as102_dvb_unregister(as102_dev);
0321 
0322     /* free usb buffers */
0323     as102_free_usb_stream_buffer(as102_dev);
0324 
0325     usb_set_intfdata(intf, NULL);
0326 
0327     /* usb unregister device */
0328     usb_deregister_dev(intf, &as102_usb_class_driver);
0329 
0330     /* decrement usage counter */
0331     kref_put(&as102_dev->kref, as102_usb_release);
0332 
0333     pr_info("%s: device has been disconnected\n", DRIVER_NAME);
0334 }
0335 
0336 static int as102_usb_probe(struct usb_interface *intf,
0337                const struct usb_device_id *id)
0338 {
0339     int ret;
0340     struct as102_dev_t *as102_dev;
0341     int i;
0342 
0343     /* This should never actually happen */
0344     if (ARRAY_SIZE(as102_usb_id_table) !=
0345         (sizeof(as102_device_names) / sizeof(const char *))) {
0346         pr_err("Device names table invalid size");
0347         return -EINVAL;
0348     }
0349 
0350     as102_dev = kzalloc(sizeof(struct as102_dev_t), GFP_KERNEL);
0351     if (as102_dev == NULL)
0352         return -ENOMEM;
0353 
0354     /* Assign the user-friendly device name */
0355     for (i = 0; i < ARRAY_SIZE(as102_usb_id_table); i++) {
0356         if (id == &as102_usb_id_table[i]) {
0357             as102_dev->name = as102_device_names[i];
0358             as102_dev->elna_cfg = as102_elna_cfg[i];
0359         }
0360     }
0361 
0362     if (as102_dev->name == NULL)
0363         as102_dev->name = "Unknown AS102 device";
0364 
0365     /* set private callback functions */
0366     as102_dev->bus_adap.ops = &as102_priv_ops;
0367 
0368     /* init cmd token for usb bus */
0369     as102_dev->bus_adap.cmd = &as102_dev->bus_adap.token.usb.c;
0370     as102_dev->bus_adap.rsp = &as102_dev->bus_adap.token.usb.r;
0371 
0372     /* init kernel device reference */
0373     kref_init(&as102_dev->kref);
0374 
0375     /* store as102 device to usb_device private data */
0376     usb_set_intfdata(intf, (void *) as102_dev);
0377 
0378     /* store in as102 device the usb_device pointer */
0379     as102_dev->bus_adap.usb_dev = usb_get_dev(interface_to_usbdev(intf));
0380 
0381     /* we can register the device now, as it is ready */
0382     ret = usb_register_dev(intf, &as102_usb_class_driver);
0383     if (ret < 0) {
0384         /* something prevented us from registering this driver */
0385         dev_err(&intf->dev,
0386             "%s: usb_register_dev() failed (errno = %d)\n",
0387             __func__, ret);
0388         goto failed;
0389     }
0390 
0391     pr_info("%s: device has been detected\n", DRIVER_NAME);
0392 
0393     /* request buffer allocation for streaming */
0394     ret = as102_alloc_usb_stream_buffer(as102_dev);
0395     if (ret != 0)
0396         goto failed_stream;
0397 
0398     /* register dvb layer */
0399     ret = as102_dvb_register(as102_dev);
0400     if (ret != 0)
0401         goto failed_dvb;
0402 
0403     return ret;
0404 
0405 failed_dvb:
0406     as102_free_usb_stream_buffer(as102_dev);
0407 failed_stream:
0408     usb_deregister_dev(intf, &as102_usb_class_driver);
0409 failed:
0410     usb_put_dev(as102_dev->bus_adap.usb_dev);
0411     usb_set_intfdata(intf, NULL);
0412     kfree(as102_dev);
0413     return ret;
0414 }
0415 
0416 static int as102_open(struct inode *inode, struct file *file)
0417 {
0418     int ret = 0, minor = 0;
0419     struct usb_interface *intf = NULL;
0420     struct as102_dev_t *dev = NULL;
0421 
0422     /* read minor from inode */
0423     minor = iminor(inode);
0424 
0425     /* fetch device from usb interface */
0426     intf = usb_find_interface(&as102_usb_driver, minor);
0427     if (intf == NULL) {
0428         pr_err("%s: can't find device for minor %d\n",
0429                __func__, minor);
0430         ret = -ENODEV;
0431         goto exit;
0432     }
0433 
0434     /* get our device */
0435     dev = usb_get_intfdata(intf);
0436     if (dev == NULL) {
0437         ret = -EFAULT;
0438         goto exit;
0439     }
0440 
0441     /* save our device object in the file's private structure */
0442     file->private_data = dev;
0443 
0444     /* increment our usage count for the device */
0445     kref_get(&dev->kref);
0446 
0447 exit:
0448     return ret;
0449 }
0450 
0451 static int as102_release(struct inode *inode, struct file *file)
0452 {
0453     struct as102_dev_t *dev = NULL;
0454 
0455     dev = file->private_data;
0456     if (dev != NULL) {
0457         /* decrement the count on our device */
0458         kref_put(&dev->kref, as102_usb_release);
0459     }
0460 
0461     return 0;
0462 }
0463 
0464 MODULE_DEVICE_TABLE(usb, as102_usb_id_table);
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