staging: comedi: usbdux: refactor init code
authorH Hartley Sweeten <hartleys@visionengravers.com>
Wed, 20 Jun 2012 19:02:49 +0000 (12:02 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 20 Jun 2012 20:04:50 +0000 (13:04 -0700)
Refactor the usb driver probe/disconnect and comedi driver attach/
detach to follow the style of the other comedi driver types to
improve maintainability.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/comedi/drivers/usbdux.c

index 586936b..848c7ec 100644 (file)
@@ -1,6 +1,3 @@
-#define DRIVER_VERSION "v2.4"
-#define DRIVER_AUTHOR "Bernd Porr, BerndPorr@f2s.com"
-#define DRIVER_DESC "Stirling/ITL USB-DUX -- Bernd.Porr@f2s.com"
 /*
    comedi/drivers/usbdux.c
    Copyright (C) 2003-2007 Bernd Porr, Bernd.Porr@f2s.com
@@ -101,8 +98,6 @@ sampling rate. If you sample two channels you get 4kHz and so on.
 
 #include "../comedidev.h"
 
-#define BOARDNAME "usbdux"
-
 /* timeout for the USB-transfer in ms*/
 #define BULK_TIMEOUT 1000
 
@@ -317,8 +312,6 @@ static struct usbduxsub usbduxsub[NUMUSBDUX];
 
 static DEFINE_SEMAPHORE(start_stop_sem);
 
-static struct comedi_driver usbdux_driver;     /* see below for initializer */
-
 /*
  * Stops the data acquision
  * It should be safe to call this function from any context
@@ -2299,6 +2292,231 @@ static void tidy_up(struct usbduxsub *usbduxsub_tmp)
        usbduxsub_tmp->pwm_cmd_running = 0;
 }
 
+/* common part of attach and attach_usb */
+static int usbdux_attach_common(struct comedi_device *dev,
+                               struct usbduxsub *udev,
+                               void *aux_data, int aux_len)
+{
+       int ret;
+       struct comedi_subdevice *s = NULL;
+       int n_subdevs;
+
+       down(&udev->sem);
+       /* pointer back to the corresponding comedi device */
+       udev->comedidev = dev;
+
+       /* trying to upload the firmware into the chip */
+       if (aux_data)
+               firmwareUpload(udev, aux_data, aux_len);
+
+       dev->board_name = "usbdux";
+
+       /* set number of subdevices */
+       if (udev->high_speed) {
+               /* with pwm */
+               n_subdevs = 5;
+       } else {
+               /* without pwm */
+               n_subdevs = 4;
+       }
+
+       ret = comedi_alloc_subdevices(dev, n_subdevs);
+       if (ret) {
+               up(&udev->sem);
+               return ret;
+       }
+
+       /* private structure is also simply the usb-structure */
+       dev->private = udev;
+
+       /* the first subdevice is the A/D converter */
+       s = dev->subdevices + SUBDEV_AD;
+       /* the URBs get the comedi subdevice */
+       /* which is responsible for reading */
+       /* this is the subdevice which reads data */
+       dev->read_subdev = s;
+       /* the subdevice receives as private structure the */
+       /* usb-structure */
+       s->private = NULL;
+       /* analog input */
+       s->type = COMEDI_SUBD_AI;
+       /* readable and ref is to ground */
+       s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
+       /* 8 channels */
+       s->n_chan = 8;
+       /* length of the channellist */
+       s->len_chanlist = 8;
+       /* callback functions */
+       s->insn_read = usbdux_ai_insn_read;
+       s->do_cmdtest = usbdux_ai_cmdtest;
+       s->do_cmd = usbdux_ai_cmd;
+       s->cancel = usbdux_ai_cancel;
+       /* max value from the A/D converter (12bit) */
+       s->maxdata = 0xfff;
+       /* range table to convert to physical units */
+       s->range_table = (&range_usbdux_ai_range);
+
+       /* analog out */
+       s = dev->subdevices + SUBDEV_DA;
+       /* analog out */
+       s->type = COMEDI_SUBD_AO;
+       /* backward pointer */
+       dev->write_subdev = s;
+       /* the subdevice receives as private structure the */
+       /* usb-structure */
+       s->private = NULL;
+       /* are writable */
+       s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
+       /* 4 channels */
+       s->n_chan = 4;
+       /* length of the channellist */
+       s->len_chanlist = 4;
+       /* 12 bit resolution */
+       s->maxdata = 0x0fff;
+       /* bipolar range */
+       s->range_table = (&range_usbdux_ao_range);
+       /* callback */
+       s->do_cmdtest = usbdux_ao_cmdtest;
+       s->do_cmd = usbdux_ao_cmd;
+       s->cancel = usbdux_ao_cancel;
+       s->insn_read = usbdux_ao_insn_read;
+       s->insn_write = usbdux_ao_insn_write;
+
+       /* digital I/O */
+       s = dev->subdevices + SUBDEV_DIO;
+       s->type = COMEDI_SUBD_DIO;
+       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+       s->n_chan = 8;
+       s->maxdata = 1;
+       s->range_table = (&range_digital);
+       s->insn_bits = usbdux_dio_insn_bits;
+       s->insn_config = usbdux_dio_insn_config;
+       /* we don't use it */
+       s->private = NULL;
+
+       /* counter */
+       s = dev->subdevices + SUBDEV_COUNTER;
+       s->type = COMEDI_SUBD_COUNTER;
+       s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
+       s->n_chan = 4;
+       s->maxdata = 0xFFFF;
+       s->insn_read = usbdux_counter_read;
+       s->insn_write = usbdux_counter_write;
+       s->insn_config = usbdux_counter_config;
+
+       if (udev->high_speed) {
+               /* timer / pwm */
+               s = dev->subdevices + SUBDEV_PWM;
+               s->type = COMEDI_SUBD_PWM;
+               s->subdev_flags = SDF_WRITABLE | SDF_PWM_HBRIDGE;
+               s->n_chan = 8;
+               /* this defines the max duty cycle resolution */
+               s->maxdata = udev->sizePwmBuf;
+               s->insn_write = usbdux_pwm_write;
+               s->insn_read = usbdux_pwm_read;
+               s->insn_config = usbdux_pwm_config;
+               usbdux_pwm_period(dev, s, PWM_DEFAULT_PERIOD);
+       }
+       /* finally decide that it's attached */
+       udev->attached = 1;
+
+       up(&udev->sem);
+
+       dev_info(&udev->interface->dev, "comedi%d: attached to usbdux.\n",
+                dev->minor);
+
+       return 0;
+}
+
+/* is called when comedi-config is called */
+static int usbdux_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+       int ret;
+       int index;
+       int i;
+       void *aux_data;
+       int aux_len;
+
+       dev->private = NULL;
+
+       aux_data = comedi_aux_data(it->options, 0);
+       aux_len = it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
+       if (aux_data == NULL)
+               aux_len = 0;
+       else if (aux_len == 0)
+               aux_data = NULL;
+
+       down(&start_stop_sem);
+       /* find a valid device which has been detected by the probe function of
+        * the usb */
+       index = -1;
+       for (i = 0; i < NUMUSBDUX; i++) {
+               if ((usbduxsub[i].probed) && (!usbduxsub[i].attached)) {
+                       index = i;
+                       break;
+               }
+       }
+
+       if (index < 0) {
+               printk(KERN_ERR
+                      "comedi%d: usbdux: error: attach failed, no usbdux devs connected to the usb bus.\n",
+                      dev->minor);
+               ret = -ENODEV;
+       } else
+               ret = usbdux_attach_common(dev, &usbduxsub[index],
+                                          aux_data, aux_len);
+       up(&start_stop_sem);
+       return ret;
+}
+
+/* is called from comedi_usb_auto_config() */
+static int usbdux_attach_usb(struct comedi_device *dev,
+                            struct usb_interface *uinterf)
+{
+       int ret;
+       struct usbduxsub *this_usbduxsub;
+
+       dev->private = NULL;
+
+       down(&start_stop_sem);
+       this_usbduxsub = usb_get_intfdata(uinterf);
+       if (!this_usbduxsub || !this_usbduxsub->probed) {
+               printk(KERN_ERR
+                      "comedi%d: usbdux: error: attach_usb failed, not connected\n",
+                      dev->minor);
+               ret = -ENODEV;
+       } else if (this_usbduxsub->attached) {
+               printk(KERN_ERR
+                      "comedi%d: usbdux: error: attach_usb failed, already attached\n",
+                      dev->minor);
+               ret = -ENODEV;
+       } else
+               ret = usbdux_attach_common(dev, this_usbduxsub, NULL, 0);
+       up(&start_stop_sem);
+       return ret;
+}
+
+static void usbdux_detach(struct comedi_device *dev)
+{
+       struct usbduxsub *usb = dev->private;
+
+       if (usb) {
+               down(&usb->sem);
+               dev->private = NULL;
+               usb->attached = 0;
+               usb->comedidev = NULL;
+               up(&usb->sem);
+       }
+}
+
+static struct comedi_driver usbdux_driver = {
+       .driver_name    = "usbdux",
+       .module         = THIS_MODULE,
+       .attach         = usbdux_attach,
+       .detach         = usbdux_detach,
+       .attach_usb     = usbdux_attach_usb,
+};
+
 static void usbdux_firmware_request_complete_handler(const struct firmware *fw,
                                                     void *context)
 {
@@ -2328,9 +2546,8 @@ static void usbdux_firmware_request_complete_handler(const struct firmware *fw,
        release_firmware(fw);
 }
 
-/* allocate memory for the urbs and initialise them */
-static int usbduxsub_probe(struct usb_interface *uinterf,
-                          const struct usb_device_id *id)
+static int usbdux_usb_probe(struct usb_interface *uinterf,
+                           const struct usb_device_id *id)
 {
        struct usb_device *udev = interface_to_usbdev(uinterf);
        struct device *dev = &uinterf->dev;
@@ -2591,7 +2808,7 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
        return 0;
 }
 
-static void usbduxsub_disconnect(struct usb_interface *intf)
+static void usbdux_usb_disconnect(struct usb_interface *intf)
 {
        struct usbduxsub *usbduxsub_tmp = usb_get_intfdata(intf);
        struct usb_device *udev = interface_to_usbdev(intf);
@@ -2614,249 +2831,22 @@ static void usbduxsub_disconnect(struct usb_interface *intf)
        dev_dbg(&intf->dev, "comedi_: disconnected from the usb\n");
 }
 
-/* common part of attach and attach_usb */
-static int usbdux_attach_common(struct comedi_device *dev,
-                               struct usbduxsub *udev,
-                               void *aux_data, int aux_len)
-{
-       int ret;
-       struct comedi_subdevice *s = NULL;
-       int n_subdevs;
-
-       down(&udev->sem);
-       /* pointer back to the corresponding comedi device */
-       udev->comedidev = dev;
-
-       /* trying to upload the firmware into the chip */
-       if (aux_data)
-               firmwareUpload(udev, aux_data, aux_len);
-
-       dev->board_name = BOARDNAME;
-
-       /* set number of subdevices */
-       if (udev->high_speed) {
-               /* with pwm */
-               n_subdevs = 5;
-       } else {
-               /* without pwm */
-               n_subdevs = 4;
-       }
-
-       ret = comedi_alloc_subdevices(dev, n_subdevs);
-       if (ret) {
-               up(&udev->sem);
-               return ret;
-       }
-
-       /* private structure is also simply the usb-structure */
-       dev->private = udev;
-
-       /* the first subdevice is the A/D converter */
-       s = dev->subdevices + SUBDEV_AD;
-       /* the URBs get the comedi subdevice */
-       /* which is responsible for reading */
-       /* this is the subdevice which reads data */
-       dev->read_subdev = s;
-       /* the subdevice receives as private structure the */
-       /* usb-structure */
-       s->private = NULL;
-       /* analog input */
-       s->type = COMEDI_SUBD_AI;
-       /* readable and ref is to ground */
-       s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_CMD_READ;
-       /* 8 channels */
-       s->n_chan = 8;
-       /* length of the channellist */
-       s->len_chanlist = 8;
-       /* callback functions */
-       s->insn_read = usbdux_ai_insn_read;
-       s->do_cmdtest = usbdux_ai_cmdtest;
-       s->do_cmd = usbdux_ai_cmd;
-       s->cancel = usbdux_ai_cancel;
-       /* max value from the A/D converter (12bit) */
-       s->maxdata = 0xfff;
-       /* range table to convert to physical units */
-       s->range_table = (&range_usbdux_ai_range);
-
-       /* analog out */
-       s = dev->subdevices + SUBDEV_DA;
-       /* analog out */
-       s->type = COMEDI_SUBD_AO;
-       /* backward pointer */
-       dev->write_subdev = s;
-       /* the subdevice receives as private structure the */
-       /* usb-structure */
-       s->private = NULL;
-       /* are writable */
-       s->subdev_flags = SDF_WRITABLE | SDF_GROUND | SDF_CMD_WRITE;
-       /* 4 channels */
-       s->n_chan = 4;
-       /* length of the channellist */
-       s->len_chanlist = 4;
-       /* 12 bit resolution */
-       s->maxdata = 0x0fff;
-       /* bipolar range */
-       s->range_table = (&range_usbdux_ao_range);
-       /* callback */
-       s->do_cmdtest = usbdux_ao_cmdtest;
-       s->do_cmd = usbdux_ao_cmd;
-       s->cancel = usbdux_ao_cancel;
-       s->insn_read = usbdux_ao_insn_read;
-       s->insn_write = usbdux_ao_insn_write;
-
-       /* digital I/O */
-       s = dev->subdevices + SUBDEV_DIO;
-       s->type = COMEDI_SUBD_DIO;
-       s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
-       s->n_chan = 8;
-       s->maxdata = 1;
-       s->range_table = (&range_digital);
-       s->insn_bits = usbdux_dio_insn_bits;
-       s->insn_config = usbdux_dio_insn_config;
-       /* we don't use it */
-       s->private = NULL;
-
-       /* counter */
-       s = dev->subdevices + SUBDEV_COUNTER;
-       s->type = COMEDI_SUBD_COUNTER;
-       s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
-       s->n_chan = 4;
-       s->maxdata = 0xFFFF;
-       s->insn_read = usbdux_counter_read;
-       s->insn_write = usbdux_counter_write;
-       s->insn_config = usbdux_counter_config;
-
-       if (udev->high_speed) {
-               /* timer / pwm */
-               s = dev->subdevices + SUBDEV_PWM;
-               s->type = COMEDI_SUBD_PWM;
-               s->subdev_flags = SDF_WRITABLE | SDF_PWM_HBRIDGE;
-               s->n_chan = 8;
-               /* this defines the max duty cycle resolution */
-               s->maxdata = udev->sizePwmBuf;
-               s->insn_write = usbdux_pwm_write;
-               s->insn_read = usbdux_pwm_read;
-               s->insn_config = usbdux_pwm_config;
-               usbdux_pwm_period(dev, s, PWM_DEFAULT_PERIOD);
-       }
-       /* finally decide that it's attached */
-       udev->attached = 1;
-
-       up(&udev->sem);
-
-       dev_info(&udev->interface->dev, "comedi%d: attached to usbdux.\n",
-                dev->minor);
-
-       return 0;
-}
-
-/* is called when comedi-config is called */
-static int usbdux_attach(struct comedi_device *dev, struct comedi_devconfig *it)
-{
-       int ret;
-       int index;
-       int i;
-       void *aux_data;
-       int aux_len;
-
-       dev->private = NULL;
-
-       aux_data = comedi_aux_data(it->options, 0);
-       aux_len = it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
-       if (aux_data == NULL)
-               aux_len = 0;
-       else if (aux_len == 0)
-               aux_data = NULL;
-
-       down(&start_stop_sem);
-       /* find a valid device which has been detected by the probe function of
-        * the usb */
-       index = -1;
-       for (i = 0; i < NUMUSBDUX; i++) {
-               if ((usbduxsub[i].probed) && (!usbduxsub[i].attached)) {
-                       index = i;
-                       break;
-               }
-       }
-
-       if (index < 0) {
-               printk(KERN_ERR
-                      "comedi%d: usbdux: error: attach failed, no usbdux devs connected to the usb bus.\n",
-                      dev->minor);
-               ret = -ENODEV;
-       } else
-               ret = usbdux_attach_common(dev, &usbduxsub[index],
-                                          aux_data, aux_len);
-       up(&start_stop_sem);
-       return ret;
-}
-
-/* is called from comedi_usb_auto_config() */
-static int usbdux_attach_usb(struct comedi_device *dev,
-                            struct usb_interface *uinterf)
-{
-       int ret;
-       struct usbduxsub *this_usbduxsub;
-
-       dev->private = NULL;
-
-       down(&start_stop_sem);
-       this_usbduxsub = usb_get_intfdata(uinterf);
-       if (!this_usbduxsub || !this_usbduxsub->probed) {
-               printk(KERN_ERR
-                      "comedi%d: usbdux: error: attach_usb failed, not connected\n",
-                      dev->minor);
-               ret = -ENODEV;
-       } else if (this_usbduxsub->attached) {
-               printk(KERN_ERR
-                      "comedi%d: usbdux: error: attach_usb failed, already attached\n",
-                      dev->minor);
-               ret = -ENODEV;
-       } else
-               ret = usbdux_attach_common(dev, this_usbduxsub, NULL, 0);
-       up(&start_stop_sem);
-       return ret;
-}
-
-static void usbdux_detach(struct comedi_device *dev)
-{
-       struct usbduxsub *usb = dev->private;
-
-       if (usb) {
-               down(&usb->sem);
-               dev->private = NULL;
-               usb->attached = 0;
-               usb->comedidev = NULL;
-               up(&usb->sem);
-       }
-}
-
-/* main driver struct */
-static struct comedi_driver usbdux_driver = {
-       .driver_name    = "usbdux",
-       .module         = THIS_MODULE,
-       .attach         = usbdux_attach,
-       .detach         = usbdux_detach,
-       .attach_usb     = usbdux_attach_usb,
-};
-
-/* Table with the USB-devices: just now only testing IDs */
-static const struct usb_device_id usbduxsub_table[] = {
-       {USB_DEVICE(0x13d8, 0x0001)},
-       {USB_DEVICE(0x13d8, 0x0002)},
-       {}                      /* Terminating entry */
+static const struct usb_device_id usbdux_usb_table[] = {
+       { USB_DEVICE(0x13d8, 0x0001) },
+       { USB_DEVICE(0x13d8, 0x0002) },
+       { }
 };
 
-MODULE_DEVICE_TABLE(usb, usbduxsub_table);
+MODULE_DEVICE_TABLE(usb, usbdux_usb_table);
 
 static struct usb_driver usbdux_usb_driver = {
-       .name           = BOARDNAME,
-       .probe          = usbduxsub_probe,
-       .disconnect     = usbduxsub_disconnect,
-       .id_table       = usbduxsub_table,
+       .name           = "usbdux",
+       .probe          = usbdux_usb_probe,
+       .disconnect     = usbdux_usb_disconnect,
+       .id_table       = usbdux_usb_table,
 };
 module_comedi_usb_driver(usbdux_driver, usbdux_usb_driver);
 
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Bernd Porr, BerndPorr@f2s.com");
+MODULE_DESCRIPTION("Stirling/ITL USB-DUX -- Bernd.Porr@f2s.com");
 MODULE_LICENSE("GPL");