David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 1 | /* |
| 2 | module/drivers.c |
| 3 | functions for manipulating drivers |
| 4 | |
| 5 | COMEDI - Linux Control and Measurement Device Interface |
| 6 | Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 17 | */ |
| 18 | |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 19 | #include <linux/device.h> |
| 20 | #include <linux/module.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 21 | #include <linux/errno.h> |
Randy Dunlap | 78b1061 | 2012-06-11 16:35:50 -0700 | [diff] [blame] | 22 | #include <linux/kconfig.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/fcntl.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 26 | #include <linux/ioport.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/slab.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 29 | #include <linux/highmem.h> /* for SuSE brokenness */ |
| 30 | #include <linux/vmalloc.h> |
| 31 | #include <linux/cdev.h> |
| 32 | #include <linux/dma-mapping.h> |
Andrea Gelmini | 5617f9d | 2010-02-26 17:37:00 +0100 | [diff] [blame] | 33 | #include <linux/io.h> |
H Hartley Sweeten | 3d1fe3f | 2013-04-18 14:34:37 -0700 | [diff] [blame] | 34 | #include <linux/interrupt.h> |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 35 | #include <linux/firmware.h> |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 36 | |
Greg Kroah-Hartman | 242e7ad | 2010-05-03 15:20:29 -0700 | [diff] [blame] | 37 | #include "comedidev.h" |
Ian Abbott | 3a5fa27 | 2012-06-19 10:17:44 +0100 | [diff] [blame] | 38 | #include "comedi_internal.h" |
Greg Kroah-Hartman | 242e7ad | 2010-05-03 15:20:29 -0700 | [diff] [blame] | 39 | |
Bill Pemberton | 139dfbd | 2009-03-16 22:05:25 -0400 | [diff] [blame] | 40 | struct comedi_driver *comedi_drivers; |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 41 | DEFINE_MUTEX(comedi_drivers_list_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 42 | |
Ian Abbott | da71751 | 2013-02-01 13:23:19 +0000 | [diff] [blame] | 43 | int comedi_set_hw_dev(struct comedi_device *dev, struct device *hw_dev) |
| 44 | { |
Ian Abbott | de06d7c | 2013-02-01 13:23:20 +0000 | [diff] [blame] | 45 | if (hw_dev == dev->hw_dev) |
| 46 | return 0; |
| 47 | if (dev->hw_dev != NULL) |
| 48 | return -EEXIST; |
Ian Abbott | da71751 | 2013-02-01 13:23:19 +0000 | [diff] [blame] | 49 | dev->hw_dev = get_device(hw_dev); |
Ian Abbott | da71751 | 2013-02-01 13:23:19 +0000 | [diff] [blame] | 50 | return 0; |
| 51 | } |
| 52 | EXPORT_SYMBOL_GPL(comedi_set_hw_dev); |
| 53 | |
Ian Abbott | de06d7c | 2013-02-01 13:23:20 +0000 | [diff] [blame] | 54 | static void comedi_clear_hw_dev(struct comedi_device *dev) |
| 55 | { |
| 56 | put_device(dev->hw_dev); |
| 57 | dev->hw_dev = NULL; |
| 58 | } |
| 59 | |
H Hartley Sweeten | 54db996 | 2013-06-24 16:55:14 -0700 | [diff] [blame] | 60 | /** |
| 61 | * comedi_alloc_devpriv() - Allocate memory for the device private data. |
| 62 | * @dev: comedi_device struct |
| 63 | * @size: size of the memory to allocate |
| 64 | */ |
| 65 | void *comedi_alloc_devpriv(struct comedi_device *dev, size_t size) |
| 66 | { |
| 67 | dev->private = kzalloc(size, GFP_KERNEL); |
| 68 | return dev->private; |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(comedi_alloc_devpriv); |
| 71 | |
H Hartley Sweeten | 8b9ba6e | 2012-06-12 11:57:27 -0700 | [diff] [blame] | 72 | int comedi_alloc_subdevices(struct comedi_device *dev, int num_subdevices) |
H Hartley Sweeten | 2f0b9d0 | 2012-06-11 17:45:15 -0700 | [diff] [blame] | 73 | { |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 74 | struct comedi_subdevice *s; |
H Hartley Sweeten | 8b9ba6e | 2012-06-12 11:57:27 -0700 | [diff] [blame] | 75 | int i; |
H Hartley Sweeten | 2f0b9d0 | 2012-06-11 17:45:15 -0700 | [diff] [blame] | 76 | |
H Hartley Sweeten | 7f801c4 | 2012-06-12 11:57:45 -0700 | [diff] [blame] | 77 | if (num_subdevices < 1) |
| 78 | return -EINVAL; |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 79 | |
| 80 | s = kcalloc(num_subdevices, sizeof(*s), GFP_KERNEL); |
| 81 | if (!s) |
H Hartley Sweeten | 2f0b9d0 | 2012-06-11 17:45:15 -0700 | [diff] [blame] | 82 | return -ENOMEM; |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 83 | dev->subdevices = s; |
H Hartley Sweeten | fba1d0f | 2012-06-12 11:58:27 -0700 | [diff] [blame] | 84 | dev->n_subdevices = num_subdevices; |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 85 | |
H Hartley Sweeten | 2f0b9d0 | 2012-06-11 17:45:15 -0700 | [diff] [blame] | 86 | for (i = 0; i < num_subdevices; ++i) { |
H Hartley Sweeten | 5e4c58c | 2012-09-05 18:21:25 -0700 | [diff] [blame] | 87 | s = &dev->subdevices[i]; |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 88 | s->device = dev; |
H Hartley Sweeten | 90a35c1 | 2012-12-19 17:27:02 -0700 | [diff] [blame] | 89 | s->index = i; |
H Hartley Sweeten | 03afcf4 | 2012-06-12 11:59:55 -0700 | [diff] [blame] | 90 | s->async_dma_dir = DMA_NONE; |
| 91 | spin_lock_init(&s->spin_lock); |
| 92 | s->minor = -1; |
H Hartley Sweeten | 2f0b9d0 | 2012-06-11 17:45:15 -0700 | [diff] [blame] | 93 | } |
| 94 | return 0; |
| 95 | } |
| 96 | EXPORT_SYMBOL_GPL(comedi_alloc_subdevices); |
| 97 | |
Ian Abbott | 3867e20 | 2013-11-08 15:03:26 +0000 | [diff] [blame] | 98 | static void comedi_device_detach_cleanup(struct comedi_device *dev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 99 | { |
| 100 | int i; |
Bill Pemberton | 34c4392 | 2009-03-16 22:05:14 -0400 | [diff] [blame] | 101 | struct comedi_subdevice *s; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 102 | |
| 103 | if (dev->subdevices) { |
| 104 | for (i = 0; i < dev->n_subdevices; i++) { |
H Hartley Sweeten | 5e4c58c | 2012-09-05 18:21:25 -0700 | [diff] [blame] | 105 | s = &dev->subdevices[i]; |
H Hartley Sweeten | 588ba6d | 2013-06-11 11:32:29 -0700 | [diff] [blame] | 106 | if (s->runflags & SRF_FREE_SPRIV) |
| 107 | kfree(s->private); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 108 | comedi_free_subdevice_minor(s); |
| 109 | if (s->async) { |
| 110 | comedi_buf_alloc(dev, s, 0); |
| 111 | kfree(s->async); |
| 112 | } |
| 113 | } |
| 114 | kfree(dev->subdevices); |
| 115 | dev->subdevices = NULL; |
| 116 | dev->n_subdevices = 0; |
| 117 | } |
Bill Pemberton | dedd132 | 2009-03-16 22:04:18 -0400 | [diff] [blame] | 118 | kfree(dev->private); |
| 119 | dev->private = NULL; |
Greg Kroah-Hartman | 7029a87 | 2010-05-03 15:55:45 -0700 | [diff] [blame] | 120 | dev->driver = NULL; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 121 | dev->board_name = NULL; |
| 122 | dev->board_ptr = NULL; |
| 123 | dev->iobase = 0; |
H Hartley Sweeten | 316f97f | 2013-04-18 14:31:29 -0700 | [diff] [blame] | 124 | dev->iolen = 0; |
Ian Abbott | 00ca6884 | 2013-03-15 13:15:35 +0000 | [diff] [blame] | 125 | dev->ioenabled = false; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 126 | dev->irq = 0; |
| 127 | dev->read_subdev = NULL; |
| 128 | dev->write_subdev = NULL; |
| 129 | dev->open = NULL; |
| 130 | dev->close = NULL; |
Ian Abbott | de06d7c | 2013-02-01 13:23:20 +0000 | [diff] [blame] | 131 | comedi_clear_hw_dev(dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 132 | } |
| 133 | |
Ian Abbott | 016599f | 2013-04-04 14:58:58 +0100 | [diff] [blame] | 134 | void comedi_device_detach(struct comedi_device *dev) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 135 | { |
Ian Abbott | d19db51 | 2013-11-08 15:03:28 +0000 | [diff] [blame] | 136 | comedi_device_cancel_all(dev); |
Ian Abbott | bf11c13 | 2013-11-08 15:03:25 +0000 | [diff] [blame] | 137 | down_write(&dev->attach_lock); |
Ian Abbott | a7401cd | 2013-03-15 13:15:33 +0000 | [diff] [blame] | 138 | dev->attached = false; |
Ian Abbott | ef77c0b | 2013-11-08 15:03:29 +0000 | [diff] [blame] | 139 | dev->detach_count++; |
Andrea Gelmini | 5617f9d | 2010-02-26 17:37:00 +0100 | [diff] [blame] | 140 | if (dev->driver) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 141 | dev->driver->detach(dev); |
Ian Abbott | 3867e20 | 2013-11-08 15:03:26 +0000 | [diff] [blame] | 142 | comedi_device_detach_cleanup(dev); |
Ian Abbott | bf11c13 | 2013-11-08 15:03:25 +0000 | [diff] [blame] | 143 | up_write(&dev->attach_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 144 | } |
| 145 | |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 146 | static int poll_invalid(struct comedi_device *dev, struct comedi_subdevice *s) |
| 147 | { |
| 148 | return -EINVAL; |
| 149 | } |
| 150 | |
| 151 | int insn_inval(struct comedi_device *dev, struct comedi_subdevice *s, |
| 152 | struct comedi_insn *insn, unsigned int *data) |
| 153 | { |
| 154 | return -EINVAL; |
| 155 | } |
| 156 | |
H Hartley Sweeten | e523c6c | 2013-08-06 09:31:35 -0700 | [diff] [blame] | 157 | /** |
| 158 | * comedi_dio_insn_config() - boilerplate (*insn_config) for DIO subdevices. |
| 159 | * @dev: comedi_device struct |
| 160 | * @s: comedi_subdevice struct |
| 161 | * @insn: comedi_insn struct |
| 162 | * @data: parameters for the @insn |
| 163 | * @mask: io_bits mask for grouped channels |
| 164 | */ |
| 165 | int comedi_dio_insn_config(struct comedi_device *dev, |
| 166 | struct comedi_subdevice *s, |
| 167 | struct comedi_insn *insn, |
| 168 | unsigned int *data, |
| 169 | unsigned int mask) |
| 170 | { |
| 171 | unsigned int chan_mask = 1 << CR_CHAN(insn->chanspec); |
| 172 | |
| 173 | if (!mask) |
| 174 | mask = chan_mask; |
| 175 | |
| 176 | switch (data[0]) { |
| 177 | case INSN_CONFIG_DIO_INPUT: |
| 178 | s->io_bits &= ~mask; |
| 179 | break; |
| 180 | |
| 181 | case INSN_CONFIG_DIO_OUTPUT: |
| 182 | s->io_bits |= mask; |
| 183 | break; |
| 184 | |
| 185 | case INSN_CONFIG_DIO_QUERY: |
| 186 | data[1] = (s->io_bits & mask) ? COMEDI_OUTPUT : COMEDI_INPUT; |
| 187 | return insn->n; |
| 188 | |
| 189 | default: |
| 190 | return -EINVAL; |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | EXPORT_SYMBOL_GPL(comedi_dio_insn_config); |
| 196 | |
H Hartley Sweeten | 05e60b1 | 2013-08-30 11:04:56 -0700 | [diff] [blame] | 197 | /** |
| 198 | * comedi_dio_update_state() - update the internal state of DIO subdevices. |
| 199 | * @s: comedi_subdevice struct |
| 200 | * @data: the channel mask and bits to update |
| 201 | */ |
| 202 | unsigned int comedi_dio_update_state(struct comedi_subdevice *s, |
| 203 | unsigned int *data) |
| 204 | { |
| 205 | unsigned int chanmask = (s->n_chan < 32) ? ((1 << s->n_chan) - 1) |
| 206 | : 0xffffffff; |
| 207 | unsigned int mask = data[0] & chanmask; |
| 208 | unsigned int bits = data[1]; |
| 209 | |
| 210 | if (mask) { |
| 211 | s->state &= ~mask; |
| 212 | s->state |= (bits & mask); |
| 213 | } |
| 214 | |
| 215 | return mask; |
| 216 | } |
| 217 | EXPORT_SYMBOL_GPL(comedi_dio_update_state); |
| 218 | |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 219 | static int insn_rw_emulate_bits(struct comedi_device *dev, |
| 220 | struct comedi_subdevice *s, |
| 221 | struct comedi_insn *insn, unsigned int *data) |
| 222 | { |
| 223 | struct comedi_insn new_insn; |
| 224 | int ret; |
| 225 | static const unsigned channels_per_bitfield = 32; |
| 226 | |
| 227 | unsigned chan = CR_CHAN(insn->chanspec); |
| 228 | const unsigned base_bitfield_channel = |
| 229 | (chan < channels_per_bitfield) ? 0 : chan; |
| 230 | unsigned int new_data[2]; |
| 231 | memset(new_data, 0, sizeof(new_data)); |
| 232 | memset(&new_insn, 0, sizeof(new_insn)); |
| 233 | new_insn.insn = INSN_BITS; |
| 234 | new_insn.chanspec = base_bitfield_channel; |
| 235 | new_insn.n = 2; |
| 236 | new_insn.subdev = insn->subdev; |
| 237 | |
| 238 | if (insn->insn == INSN_WRITE) { |
| 239 | if (!(s->subdev_flags & SDF_WRITABLE)) |
| 240 | return -EINVAL; |
| 241 | new_data[0] = 1 << (chan - base_bitfield_channel); /* mask */ |
| 242 | new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) |
| 243 | : 0; /* bits */ |
| 244 | } |
| 245 | |
| 246 | ret = s->insn_bits(dev, s, &new_insn, new_data); |
| 247 | if (ret < 0) |
| 248 | return ret; |
| 249 | |
| 250 | if (insn->insn == INSN_READ) |
| 251 | data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1; |
| 252 | |
| 253 | return 1; |
| 254 | } |
| 255 | |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 256 | static int __comedi_device_postconfig_async(struct comedi_device *dev, |
| 257 | struct comedi_subdevice *s) |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 258 | { |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 259 | struct comedi_async *async; |
| 260 | unsigned int buf_size; |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 261 | int ret; |
| 262 | |
H Hartley Sweeten | 57b71c3 | 2013-01-21 14:37:15 -0700 | [diff] [blame] | 263 | if ((s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) == 0) { |
| 264 | dev_warn(dev->class_dev, |
| 265 | "async subdevices must support SDF_CMD_READ or SDF_CMD_WRITE\n"); |
| 266 | return -EINVAL; |
| 267 | } |
| 268 | if (!s->do_cmdtest) { |
| 269 | dev_warn(dev->class_dev, |
| 270 | "async subdevices must have a do_cmdtest() function\n"); |
| 271 | return -EINVAL; |
| 272 | } |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 273 | |
| 274 | async = kzalloc(sizeof(*async), GFP_KERNEL); |
Joe Perches | 78110bb | 2013-02-11 09:41:29 -0800 | [diff] [blame] | 275 | if (!async) |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 276 | return -ENOMEM; |
Joe Perches | 78110bb | 2013-02-11 09:41:29 -0800 | [diff] [blame] | 277 | |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 278 | init_waitqueue_head(&async->wait_head); |
| 279 | async->subdevice = s; |
| 280 | s->async = async; |
| 281 | |
| 282 | async->max_bufsize = comedi_default_buf_maxsize_kb * 1024; |
| 283 | buf_size = comedi_default_buf_size_kb * 1024; |
| 284 | if (buf_size > async->max_bufsize) |
| 285 | buf_size = async->max_bufsize; |
| 286 | |
| 287 | if (comedi_buf_alloc(dev, s, buf_size) < 0) { |
| 288 | dev_warn(dev->class_dev, "Buffer allocation failed\n"); |
| 289 | return -ENOMEM; |
| 290 | } |
| 291 | if (s->buf_change) { |
| 292 | ret = s->buf_change(dev, s, buf_size); |
| 293 | if (ret < 0) |
| 294 | return ret; |
| 295 | } |
| 296 | |
Ian Abbott | f65cc54 | 2013-02-01 10:20:30 +0000 | [diff] [blame] | 297 | comedi_alloc_subdevice_minor(s); |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static int __comedi_device_postconfig(struct comedi_device *dev) |
| 303 | { |
| 304 | struct comedi_subdevice *s; |
| 305 | int ret; |
| 306 | int i; |
| 307 | |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 308 | for (i = 0; i < dev->n_subdevices; i++) { |
| 309 | s = &dev->subdevices[i]; |
| 310 | |
| 311 | if (s->type == COMEDI_SUBD_UNUSED) |
| 312 | continue; |
| 313 | |
H Hartley Sweeten | 09567cb | 2013-08-30 10:47:03 -0700 | [diff] [blame] | 314 | if (s->type == COMEDI_SUBD_DO) { |
| 315 | if (s->n_chan < 32) |
| 316 | s->io_bits = (1 << s->n_chan) - 1; |
| 317 | else |
| 318 | s->io_bits = 0xffffffff; |
| 319 | } |
| 320 | |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 321 | if (s->len_chanlist == 0) |
| 322 | s->len_chanlist = 1; |
| 323 | |
| 324 | if (s->do_cmd) { |
H Hartley Sweeten | 40f58a6 | 2013-01-21 14:36:40 -0700 | [diff] [blame] | 325 | ret = __comedi_device_postconfig_async(dev, s); |
| 326 | if (ret) |
| 327 | return ret; |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | if (!s->range_table && !s->range_table_list) |
| 331 | s->range_table = &range_unknown; |
| 332 | |
| 333 | if (!s->insn_read && s->insn_bits) |
| 334 | s->insn_read = insn_rw_emulate_bits; |
| 335 | if (!s->insn_write && s->insn_bits) |
| 336 | s->insn_write = insn_rw_emulate_bits; |
| 337 | |
| 338 | if (!s->insn_read) |
| 339 | s->insn_read = insn_inval; |
| 340 | if (!s->insn_write) |
| 341 | s->insn_write = insn_inval; |
| 342 | if (!s->insn_bits) |
| 343 | s->insn_bits = insn_inval; |
| 344 | if (!s->insn_config) |
| 345 | s->insn_config = insn_inval; |
| 346 | |
| 347 | if (!s->poll) |
| 348 | s->poll = poll_invalid; |
| 349 | } |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 354 | /* do a little post-config cleanup */ |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 355 | static int comedi_device_postconfig(struct comedi_device *dev) |
| 356 | { |
Ian Abbott | b2a644b | 2013-04-04 14:58:56 +0100 | [diff] [blame] | 357 | int ret; |
| 358 | |
| 359 | ret = __comedi_device_postconfig(dev); |
H Hartley Sweeten | ae5dd5f | 2013-04-08 10:56:02 -0700 | [diff] [blame] | 360 | if (ret < 0) |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 361 | return ret; |
Ian Abbott | bf11c13 | 2013-11-08 15:03:25 +0000 | [diff] [blame] | 362 | down_write(&dev->attach_lock); |
Ian Abbott | a7401cd | 2013-03-15 13:15:33 +0000 | [diff] [blame] | 363 | dev->attached = true; |
Ian Abbott | bf11c13 | 2013-11-08 15:03:25 +0000 | [diff] [blame] | 364 | up_write(&dev->attach_lock); |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 365 | return 0; |
| 366 | } |
| 367 | |
H Hartley Sweeten | 01fca37 | 2013-01-21 14:36:11 -0700 | [diff] [blame] | 368 | /* |
| 369 | * Generic recognize function for drivers that register their supported |
| 370 | * board names. |
| 371 | * |
| 372 | * 'driv->board_name' points to a 'const char *' member within the |
| 373 | * zeroth element of an array of some private board information |
| 374 | * structure, say 'struct foo_board' containing a member 'const char |
| 375 | * *board_name' that is initialized to point to a board name string that |
| 376 | * is one of the candidates matched against this function's 'name' |
| 377 | * parameter. |
| 378 | * |
| 379 | * 'driv->offset' is the size of the private board information |
| 380 | * structure, say 'sizeof(struct foo_board)', and 'driv->num_names' is |
| 381 | * the length of the array of private board information structures. |
| 382 | * |
| 383 | * If one of the board names in the array of private board information |
| 384 | * structures matches the name supplied to this function, the function |
| 385 | * returns a pointer to the pointer to the board name, otherwise it |
| 386 | * returns NULL. The return value ends up in the 'board_ptr' member of |
| 387 | * a 'struct comedi_device' that the low-level comedi driver's |
| 388 | * 'attach()' hook can convert to a point to a particular element of its |
| 389 | * array of private board information structures by subtracting the |
| 390 | * offset of the member that points to the board name. (No subtraction |
| 391 | * is required if the board name pointer is the first member of the |
| 392 | * private board information structure, which is generally the case.) |
| 393 | */ |
| 394 | static void *comedi_recognize(struct comedi_driver *driv, const char *name) |
| 395 | { |
| 396 | char **name_ptr = (char **)driv->board_name; |
| 397 | int i; |
| 398 | |
| 399 | for (i = 0; i < driv->num_names; i++) { |
| 400 | if (strcmp(*name_ptr, name) == 0) |
| 401 | return name_ptr; |
| 402 | name_ptr = (void *)name_ptr + driv->offset; |
| 403 | } |
| 404 | |
| 405 | return NULL; |
| 406 | } |
| 407 | |
| 408 | static void comedi_report_boards(struct comedi_driver *driv) |
| 409 | { |
| 410 | unsigned int i; |
| 411 | const char *const *name_ptr; |
| 412 | |
| 413 | pr_info("comedi: valid board names for %s driver are:\n", |
| 414 | driv->driver_name); |
| 415 | |
| 416 | name_ptr = driv->board_name; |
| 417 | for (i = 0; i < driv->num_names; i++) { |
| 418 | pr_info(" %s\n", *name_ptr); |
| 419 | name_ptr = (const char **)((char *)name_ptr + driv->offset); |
| 420 | } |
| 421 | |
| 422 | if (driv->num_names == 0) |
| 423 | pr_info(" %s\n", driv->driver_name); |
| 424 | } |
| 425 | |
H Hartley Sweeten | f375ac5 | 2013-04-09 16:05:54 -0700 | [diff] [blame] | 426 | /** |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 427 | * comedi_load_firmware() - Request and load firmware for a device. |
| 428 | * @dev: comedi_device struct |
| 429 | * @hw_device: device struct for the comedi_device |
| 430 | * @name: the name of the firmware image |
| 431 | * @cb: callback to the upload the firmware image |
H Hartley Sweeten | d569541 | 2013-05-17 11:18:01 -0700 | [diff] [blame] | 432 | * @context: private context from the driver |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 433 | */ |
| 434 | int comedi_load_firmware(struct comedi_device *dev, |
| 435 | struct device *device, |
| 436 | const char *name, |
| 437 | int (*cb)(struct comedi_device *dev, |
H Hartley Sweeten | d569541 | 2013-05-17 11:18:01 -0700 | [diff] [blame] | 438 | const u8 *data, size_t size, |
| 439 | unsigned long context), |
| 440 | unsigned long context) |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 441 | { |
| 442 | const struct firmware *fw; |
| 443 | int ret; |
| 444 | |
| 445 | if (!cb) |
| 446 | return -EINVAL; |
| 447 | |
| 448 | ret = request_firmware(&fw, name, device); |
| 449 | if (ret == 0) { |
H Hartley Sweeten | d569541 | 2013-05-17 11:18:01 -0700 | [diff] [blame] | 450 | ret = cb(dev, fw->data, fw->size, context); |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 451 | release_firmware(fw); |
| 452 | } |
| 453 | |
H Hartley Sweeten | c6236c0 | 2013-12-10 16:31:25 -0700 | [diff] [blame] | 454 | return ret < 0 ? ret : 0; |
H Hartley Sweeten | 9ff8b15 | 2013-05-17 11:17:00 -0700 | [diff] [blame] | 455 | } |
| 456 | EXPORT_SYMBOL_GPL(comedi_load_firmware); |
| 457 | |
| 458 | /** |
H Hartley Sweeten | ca8b296 | 2013-04-09 16:30:11 -0700 | [diff] [blame] | 459 | * __comedi_request_region() - Request an I/O reqion for a legacy driver. |
H Hartley Sweeten | f375ac5 | 2013-04-09 16:05:54 -0700 | [diff] [blame] | 460 | * @dev: comedi_device struct |
| 461 | * @start: base address of the I/O reqion |
| 462 | * @len: length of the I/O region |
| 463 | */ |
H Hartley Sweeten | ca8b296 | 2013-04-09 16:30:11 -0700 | [diff] [blame] | 464 | int __comedi_request_region(struct comedi_device *dev, |
| 465 | unsigned long start, unsigned long len) |
H Hartley Sweeten | f375ac5 | 2013-04-09 16:05:54 -0700 | [diff] [blame] | 466 | { |
| 467 | if (!start) { |
| 468 | dev_warn(dev->class_dev, |
| 469 | "%s: a I/O base address must be specified\n", |
| 470 | dev->board_name); |
| 471 | return -EINVAL; |
| 472 | } |
| 473 | |
| 474 | if (!request_region(start, len, dev->board_name)) { |
| 475 | dev_warn(dev->class_dev, "%s: I/O port conflict (%#lx,%lu)\n", |
| 476 | dev->board_name, start, len); |
| 477 | return -EIO; |
| 478 | } |
H Hartley Sweeten | f375ac5 | 2013-04-09 16:05:54 -0700 | [diff] [blame] | 479 | |
| 480 | return 0; |
| 481 | } |
H Hartley Sweeten | ca8b296 | 2013-04-09 16:30:11 -0700 | [diff] [blame] | 482 | EXPORT_SYMBOL_GPL(__comedi_request_region); |
| 483 | |
| 484 | /** |
| 485 | * comedi_request_region() - Request an I/O reqion for a legacy driver. |
| 486 | * @dev: comedi_device struct |
| 487 | * @start: base address of the I/O reqion |
| 488 | * @len: length of the I/O region |
| 489 | */ |
| 490 | int comedi_request_region(struct comedi_device *dev, |
| 491 | unsigned long start, unsigned long len) |
| 492 | { |
| 493 | int ret; |
| 494 | |
| 495 | ret = __comedi_request_region(dev, start, len); |
H Hartley Sweeten | 316f97f | 2013-04-18 14:31:29 -0700 | [diff] [blame] | 496 | if (ret == 0) { |
H Hartley Sweeten | ca8b296 | 2013-04-09 16:30:11 -0700 | [diff] [blame] | 497 | dev->iobase = start; |
H Hartley Sweeten | 316f97f | 2013-04-18 14:31:29 -0700 | [diff] [blame] | 498 | dev->iolen = len; |
| 499 | } |
H Hartley Sweeten | ca8b296 | 2013-04-09 16:30:11 -0700 | [diff] [blame] | 500 | |
| 501 | return ret; |
| 502 | } |
H Hartley Sweeten | f375ac5 | 2013-04-09 16:05:54 -0700 | [diff] [blame] | 503 | EXPORT_SYMBOL_GPL(comedi_request_region); |
| 504 | |
H Hartley Sweeten | 316f97f | 2013-04-18 14:31:29 -0700 | [diff] [blame] | 505 | /** |
| 506 | * comedi_legacy_detach() - A generic (*detach) function for legacy drivers. |
| 507 | * @dev: comedi_device struct |
| 508 | */ |
| 509 | void comedi_legacy_detach(struct comedi_device *dev) |
| 510 | { |
H Hartley Sweeten | 3d1fe3f | 2013-04-18 14:34:37 -0700 | [diff] [blame] | 511 | if (dev->irq) { |
| 512 | free_irq(dev->irq, dev); |
| 513 | dev->irq = 0; |
| 514 | } |
H Hartley Sweeten | 316f97f | 2013-04-18 14:31:29 -0700 | [diff] [blame] | 515 | if (dev->iobase && dev->iolen) { |
| 516 | release_region(dev->iobase, dev->iolen); |
| 517 | dev->iobase = 0; |
| 518 | dev->iolen = 0; |
| 519 | } |
| 520 | } |
| 521 | EXPORT_SYMBOL_GPL(comedi_legacy_detach); |
| 522 | |
Bill Pemberton | 0707bb0 | 2009-03-16 22:06:20 -0400 | [diff] [blame] | 523 | int comedi_device_attach(struct comedi_device *dev, struct comedi_devconfig *it) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 524 | { |
Bill Pemberton | 139dfbd | 2009-03-16 22:05:25 -0400 | [diff] [blame] | 525 | struct comedi_driver *driv; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 526 | int ret; |
| 527 | |
| 528 | if (dev->attached) |
| 529 | return -EBUSY; |
| 530 | |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 531 | mutex_lock(&comedi_drivers_list_lock); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 532 | for (driv = comedi_drivers; driv; driv = driv->next) { |
Güngör Erseymen | 559e9a6 | 2012-09-11 17:56:42 +0300 | [diff] [blame] | 533 | if (!try_module_get(driv->module)) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 534 | continue; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 535 | if (driv->num_names) { |
| 536 | dev->board_ptr = comedi_recognize(driv, it->board_name); |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 537 | if (dev->board_ptr) |
| 538 | break; |
Ian Abbott | 80eb7a5 | 2012-08-14 11:29:17 +0100 | [diff] [blame] | 539 | } else if (strcmp(driv->driver_name, it->board_name) == 0) |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 540 | break; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 541 | module_put(driv->module); |
| 542 | } |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 543 | if (driv == NULL) { |
| 544 | /* recognize has failed if we get here */ |
| 545 | /* report valid board names before returning error */ |
| 546 | for (driv = comedi_drivers; driv; driv = driv->next) { |
Güngör Erseymen | 559e9a6 | 2012-09-11 17:56:42 +0300 | [diff] [blame] | 547 | if (!try_module_get(driv->module)) |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 548 | continue; |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 549 | comedi_report_boards(driv); |
| 550 | module_put(driv->module); |
| 551 | } |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 552 | ret = -EIO; |
| 553 | goto out; |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 554 | } |
Ian Abbott | 8c3714d | 2012-08-15 15:02:45 +0100 | [diff] [blame] | 555 | if (driv->attach == NULL) { |
| 556 | /* driver does not support manual configuration */ |
| 557 | dev_warn(dev->class_dev, |
| 558 | "driver '%s' does not support attach using comedi_config\n", |
| 559 | driv->driver_name); |
| 560 | module_put(driv->module); |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 561 | ret = -ENOSYS; |
| 562 | goto out; |
Ian Abbott | 8c3714d | 2012-08-15 15:02:45 +0100 | [diff] [blame] | 563 | } |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 564 | /* initialize dev->driver here so |
| 565 | * comedi_error() can be called from attach */ |
| 566 | dev->driver = driv; |
H Hartley Sweeten | 34b6840 | 2013-04-08 10:55:29 -0700 | [diff] [blame] | 567 | dev->board_name = dev->board_ptr ? *(const char **)dev->board_ptr |
| 568 | : dev->driver->driver_name; |
Ian Abbott | 3902a37 | 2012-03-30 17:15:00 +0100 | [diff] [blame] | 569 | ret = driv->attach(dev, it); |
Ian Abbott | 74ece108 | 2013-04-04 14:58:59 +0100 | [diff] [blame] | 570 | if (ret >= 0) |
| 571 | ret = comedi_device_postconfig(dev); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 572 | if (ret < 0) { |
Ian Abbott | 016599f | 2013-04-04 14:58:58 +0100 | [diff] [blame] | 573 | comedi_device_detach(dev); |
Ian Abbott | 3955dfa | 2013-08-23 12:37:17 +0100 | [diff] [blame] | 574 | module_put(driv->module); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 575 | } |
Ian Abbott | b2a644b | 2013-04-04 14:58:56 +0100 | [diff] [blame] | 576 | /* On success, the driver module count has been incremented. */ |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 577 | out: |
| 578 | mutex_unlock(&comedi_drivers_list_lock); |
Ian Abbott | b2a644b | 2013-04-04 14:58:56 +0100 | [diff] [blame] | 579 | return ret; |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 580 | } |
| 581 | |
Ian Abbott | a588da1 | 2012-11-14 13:10:38 +0000 | [diff] [blame] | 582 | int comedi_auto_config(struct device *hardware_device, |
| 583 | struct comedi_driver *driver, unsigned long context) |
Ian Abbott | f4011670 | 2012-03-30 17:15:01 +0100 | [diff] [blame] | 584 | { |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 585 | struct comedi_device *dev; |
Ian Abbott | f4011670 | 2012-03-30 17:15:01 +0100 | [diff] [blame] | 586 | int ret; |
| 587 | |
Ian Abbott | f08e0ac | 2013-04-04 14:58:42 +0100 | [diff] [blame] | 588 | if (!hardware_device) { |
| 589 | pr_warn("BUG! comedi_auto_config called with NULL hardware_device\n"); |
| 590 | return -EINVAL; |
| 591 | } |
| 592 | if (!driver) { |
| 593 | dev_warn(hardware_device, |
| 594 | "BUG! comedi_auto_config called with NULL comedi driver\n"); |
| 595 | return -EINVAL; |
| 596 | } |
| 597 | |
Ian Abbott | a588da1 | 2012-11-14 13:10:38 +0000 | [diff] [blame] | 598 | if (!driver->auto_attach) { |
| 599 | dev_warn(hardware_device, |
| 600 | "BUG! comedi driver '%s' has no auto_attach handler\n", |
| 601 | driver->driver_name); |
| 602 | return -EINVAL; |
| 603 | } |
| 604 | |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 605 | dev = comedi_alloc_board_minor(hardware_device); |
Bernd Porr | bcb6232 | 2014-01-07 21:42:25 +0000 | [diff] [blame] | 606 | if (IS_ERR(dev)) { |
| 607 | dev_warn(hardware_device, |
| 608 | "driver '%s' could not create device.\n", |
| 609 | driver->driver_name); |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 610 | return PTR_ERR(dev); |
Bernd Porr | bcb6232 | 2014-01-07 21:42:25 +0000 | [diff] [blame] | 611 | } |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 612 | /* Note: comedi_alloc_board_minor() locked dev->mutex. */ |
Ian Abbott | f4011670 | 2012-03-30 17:15:01 +0100 | [diff] [blame] | 613 | |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 614 | dev->driver = driver; |
H Hartley Sweeten | 34b6840 | 2013-04-08 10:55:29 -0700 | [diff] [blame] | 615 | dev->board_name = dev->driver->driver_name; |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 616 | ret = driver->auto_attach(dev, context); |
Ian Abbott | 74ece108 | 2013-04-04 14:58:59 +0100 | [diff] [blame] | 617 | if (ret >= 0) |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 618 | ret = comedi_device_postconfig(dev); |
H Hartley Sweeten | 6013a9a | 2013-04-08 10:55:05 -0700 | [diff] [blame] | 619 | mutex_unlock(&dev->mutex); |
Ian Abbott | f4011670 | 2012-03-30 17:15:01 +0100 | [diff] [blame] | 620 | |
Bernd Porr | bcb6232 | 2014-01-07 21:42:25 +0000 | [diff] [blame] | 621 | if (ret < 0) { |
| 622 | dev_warn(hardware_device, |
| 623 | "driver '%s' failed to auto-configure device.\n", |
| 624 | driver->driver_name); |
Ian Abbott | f5b31e1 | 2013-04-04 14:58:48 +0100 | [diff] [blame] | 625 | comedi_release_hardware_device(hardware_device); |
Bernd Porr | bcb6232 | 2014-01-07 21:42:25 +0000 | [diff] [blame] | 626 | } else { |
| 627 | /* |
| 628 | * class_dev should be set properly here |
| 629 | * after a successful auto config |
| 630 | */ |
| 631 | dev_info(dev->class_dev, |
| 632 | "driver '%s' has successfully auto-configured '%s'.\n", |
| 633 | driver->driver_name, dev->board_name); |
| 634 | } |
Ian Abbott | f4011670 | 2012-03-30 17:15:01 +0100 | [diff] [blame] | 635 | return ret; |
| 636 | } |
Ian Abbott | 8ed705a | 2012-10-27 21:44:14 +0100 | [diff] [blame] | 637 | EXPORT_SYMBOL_GPL(comedi_auto_config); |
| 638 | |
| 639 | void comedi_auto_unconfig(struct device *hardware_device) |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 640 | { |
Ian Abbott | c43435d | 2012-03-30 17:14:58 +0100 | [diff] [blame] | 641 | if (hardware_device == NULL) |
Mithlesh Thukral | 0a85b6f | 2009-06-08 21:04:41 +0530 | [diff] [blame] | 642 | return; |
Ian Abbott | 3346b79 | 2013-04-04 14:58:47 +0100 | [diff] [blame] | 643 | comedi_release_hardware_device(hardware_device); |
David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame] | 644 | } |
Ian Abbott | 8ed705a | 2012-10-27 21:44:14 +0100 | [diff] [blame] | 645 | EXPORT_SYMBOL_GPL(comedi_auto_unconfig); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 646 | |
| 647 | int comedi_driver_register(struct comedi_driver *driver) |
| 648 | { |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 649 | mutex_lock(&comedi_drivers_list_lock); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 650 | driver->next = comedi_drivers; |
| 651 | comedi_drivers = driver; |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 652 | mutex_unlock(&comedi_drivers_list_lock); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 653 | |
| 654 | return 0; |
| 655 | } |
H Hartley Sweeten | 5660e74 | 2013-04-12 10:11:54 -0700 | [diff] [blame] | 656 | EXPORT_SYMBOL_GPL(comedi_driver_register); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 657 | |
Ian Abbott | 99c0e26 | 2013-06-27 14:50:57 +0100 | [diff] [blame] | 658 | void comedi_driver_unregister(struct comedi_driver *driver) |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 659 | { |
| 660 | struct comedi_driver *prev; |
| 661 | int i; |
| 662 | |
Ian Abbott | c383e2d | 2013-06-27 14:50:58 +0100 | [diff] [blame] | 663 | /* unlink the driver */ |
| 664 | mutex_lock(&comedi_drivers_list_lock); |
| 665 | if (comedi_drivers == driver) { |
| 666 | comedi_drivers = driver->next; |
| 667 | } else { |
| 668 | for (prev = comedi_drivers; prev->next; prev = prev->next) { |
| 669 | if (prev->next == driver) { |
| 670 | prev->next = driver->next; |
| 671 | break; |
| 672 | } |
| 673 | } |
| 674 | } |
| 675 | mutex_unlock(&comedi_drivers_list_lock); |
| 676 | |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 677 | /* check for devices using this driver */ |
| 678 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
Ian Abbott | a200fad | 2013-11-08 15:03:35 +0000 | [diff] [blame] | 679 | struct comedi_device *dev = comedi_dev_get_from_minor(i); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 680 | |
| 681 | if (!dev) |
| 682 | continue; |
| 683 | |
| 684 | mutex_lock(&dev->mutex); |
| 685 | if (dev->attached && dev->driver == driver) { |
| 686 | if (dev->use_count) |
| 687 | dev_warn(dev->class_dev, |
| 688 | "BUG! detaching device with use_count=%d\n", |
| 689 | dev->use_count); |
| 690 | comedi_device_detach(dev); |
| 691 | } |
| 692 | mutex_unlock(&dev->mutex); |
Ian Abbott | a200fad | 2013-11-08 15:03:35 +0000 | [diff] [blame] | 693 | comedi_dev_put(dev); |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 694 | } |
H Hartley Sweeten | 1ae6b20 | 2013-01-30 15:24:38 -0700 | [diff] [blame] | 695 | } |
H Hartley Sweeten | 5660e74 | 2013-04-12 10:11:54 -0700 | [diff] [blame] | 696 | EXPORT_SYMBOL_GPL(comedi_driver_unregister); |