2 * i2c IR lirc driver for devices with zilog IR processors
4 * Copyright (c) 2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
5 * modified for PixelView (BT878P+W/FM) by
6 * Michal Kochanowicz <mkochano@pld.org.pl>
7 * Christoph Bartelmus <lirc@bartelmus.de>
8 * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
9 * Ulrich Mueller <ulrich.mueller42@web.de>
10 * modified for Asus TV-Box and Creative/VisionTek BreakOut-Box by
11 * Stefan Jahn <stefan@lkcc.org>
12 * modified for inclusion into kernel sources by
13 * Jerome Brock <jbrock@users.sourceforge.net>
14 * modified for Leadtek Winfast PVR2000 by
15 * Thomas Reitmayr (treitmayr@yahoo.com)
16 * modified for Hauppauge PVR-150 IR TX device by
17 * Mark Weaver <mark@npsl.co.uk>
18 * changed name from lirc_pvr150 to lirc_zilog, works on more than pvr-150
19 * Jarod Wilson <jarod@redhat.com>
21 * parts are cut&pasted from the lirc_i2c.c driver
23 * Numerous changes updating lirc_zilog.c in kernel 2.6.38 and later are
24 * Copyright (C) 2011 Andy Walls <awalls@md.metrocast.net>
26 * This program is free software; you can redistribute it and/or modify
27 * it under the terms of the GNU General Public License as published by
28 * the Free Software Foundation; either version 2 of the License, or
29 * (at your option) any later version.
31 * This program is distributed in the hope that it will be useful,
32 * but WITHOUT ANY WARRANTY; without even the implied warranty of
33 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
34 * GNU General Public License for more details.
36 * You should have received a copy of the GNU General Public License
37 * along with this program; if not, write to the Free Software
38 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
42 #include <linux/module.h>
43 #include <linux/kmod.h>
44 #include <linux/kernel.h>
45 #include <linux/sched.h>
47 #include <linux/poll.h>
48 #include <linux/string.h>
49 #include <linux/timer.h>
50 #include <linux/delay.h>
51 #include <linux/completion.h>
52 #include <linux/errno.h>
53 #include <linux/slab.h>
54 #include <linux/i2c.h>
55 #include <linux/firmware.h>
56 #include <linux/vmalloc.h>
58 #include <linux/mutex.h>
59 #include <linux/kthread.h>
61 #include <media/lirc_dev.h>
62 #include <media/lirc.h>
64 /* Max transfer size done by I2C transfer functions */
65 #define MAX_XFER_SIZE 64
74 struct mutex client_lock;
77 /* RX polling thread data */
78 struct task_struct *task;
90 struct mutex client_lock;
93 /* TX additional actions needed */
95 bool post_tx_ready_poll;
100 struct list_head list;
102 /* FIXME spinlock access to l.features */
103 struct lirc_driver l;
104 struct lirc_buffer rbuf;
106 struct mutex ir_lock;
109 struct i2c_adapter *adapter;
111 spinlock_t rx_ref_lock; /* struct IR_rx kref get()/put() */
114 spinlock_t tx_ref_lock; /* struct IR_tx kref get()/put() */
118 /* IR transceiver instance object list */
120 * This lock is used for the following:
121 * a. ir_devices_list access, insertions, deletions
122 * b. struct IR kref get()s and put()s
123 * c. serialization of ir_probe() for the two i2c_clients for a Z8
125 static DEFINE_MUTEX(ir_devices_lock);
126 static LIST_HEAD(ir_devices_list);
128 /* Block size for IR transmitter */
129 #define TX_BLOCK_SIZE 99
131 /* Hauppauge IR transmitter data */
132 struct tx_data_struct {
134 unsigned char *boot_data;
136 /* Start of binary data block */
137 unsigned char *datap;
139 /* End of binary data block */
142 /* Number of installed codesets */
143 unsigned int num_code_sets;
145 /* Pointers to codesets */
146 unsigned char **code_sets;
148 /* Global fixed data template */
149 int fixed[TX_BLOCK_SIZE];
152 static struct tx_data_struct *tx_data;
153 static struct mutex tx_data_lock;
156 /* module parameters */
157 static bool debug; /* debug output */
158 static bool tx_only; /* only handle the IR Tx function */
159 static int minor = -1; /* minor number */
162 /* struct IR reference counting */
163 static struct IR *get_ir_device(struct IR *ir, bool ir_devices_lock_held)
165 if (ir_devices_lock_held) {
168 mutex_lock(&ir_devices_lock);
170 mutex_unlock(&ir_devices_lock);
175 static void release_ir_device(struct kref *ref)
177 struct IR *ir = container_of(ref, struct IR, ref);
180 * Things should be in this state by now:
181 * ir->rx set to NULL and deallocated - happens before ir->rx->ir put()
182 * ir->rx->task kthread stopped - happens before ir->rx->ir put()
183 * ir->tx set to NULL and deallocated - happens before ir->tx->ir put()
184 * ir->open_count == 0 - happens on final close()
185 * ir_lock, tx_ref_lock, rx_ref_lock, all released
187 if (ir->l.minor >= 0 && ir->l.minor < MAX_IRCTL_DEVICES) {
188 lirc_unregister_driver(ir->l.minor);
189 ir->l.minor = MAX_IRCTL_DEVICES;
191 if (kfifo_initialized(&ir->rbuf.fifo))
192 lirc_buffer_free(&ir->rbuf);
197 static int put_ir_device(struct IR *ir, bool ir_devices_lock_held)
201 if (ir_devices_lock_held)
202 return kref_put(&ir->ref, release_ir_device);
204 mutex_lock(&ir_devices_lock);
205 released = kref_put(&ir->ref, release_ir_device);
206 mutex_unlock(&ir_devices_lock);
211 /* struct IR_rx reference counting */
212 static struct IR_rx *get_ir_rx(struct IR *ir)
216 spin_lock(&ir->rx_ref_lock);
220 spin_unlock(&ir->rx_ref_lock);
224 static void destroy_rx_kthread(struct IR_rx *rx, bool ir_devices_lock_held)
226 /* end up polling thread */
227 if (!IS_ERR_OR_NULL(rx->task)) {
228 kthread_stop(rx->task);
230 /* Put the ir ptr that ir_probe() gave to the rx poll thread */
231 put_ir_device(rx->ir, ir_devices_lock_held);
235 static void release_ir_rx(struct kref *ref)
237 struct IR_rx *rx = container_of(ref, struct IR_rx, ref);
238 struct IR *ir = rx->ir;
241 * This release function can't do all the work, as we want
242 * to keep the rx_ref_lock a spinlock, and killing the poll thread
243 * and releasing the ir reference can cause a sleep. That work is
244 * performed by put_ir_rx()
246 ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
247 /* Don't put_ir_device(rx->ir) here; lock can't be freed yet */
249 /* Don't do the kfree(rx) here; we still need to kill the poll thread */
252 static int put_ir_rx(struct IR_rx *rx, bool ir_devices_lock_held)
255 struct IR *ir = rx->ir;
257 spin_lock(&ir->rx_ref_lock);
258 released = kref_put(&rx->ref, release_ir_rx);
259 spin_unlock(&ir->rx_ref_lock);
260 /* Destroy the rx kthread while not holding the spinlock */
262 destroy_rx_kthread(rx, ir_devices_lock_held);
264 /* Make sure we're not still in a poll_table somewhere */
265 wake_up_interruptible(&ir->rbuf.wait_poll);
267 /* Do a reference put() for the rx->ir reference, if we released rx */
269 put_ir_device(ir, ir_devices_lock_held);
273 /* struct IR_tx reference counting */
274 static struct IR_tx *get_ir_tx(struct IR *ir)
278 spin_lock(&ir->tx_ref_lock);
282 spin_unlock(&ir->tx_ref_lock);
286 static void release_ir_tx(struct kref *ref)
288 struct IR_tx *tx = container_of(ref, struct IR_tx, ref);
289 struct IR *ir = tx->ir;
291 ir->l.features &= ~LIRC_CAN_SEND_PULSE;
292 /* Don't put_ir_device(tx->ir) here, so our lock doesn't get freed */
297 static int put_ir_tx(struct IR_tx *tx, bool ir_devices_lock_held)
300 struct IR *ir = tx->ir;
302 spin_lock(&ir->tx_ref_lock);
303 released = kref_put(&tx->ref, release_ir_tx);
304 spin_unlock(&ir->tx_ref_lock);
305 /* Do a reference put() for the tx->ir reference, if we released tx */
307 put_ir_device(ir, ir_devices_lock_held);
311 static int add_to_buf(struct IR *ir)
314 unsigned char codes[2];
315 unsigned char keybuf[6];
319 unsigned char sendbuf[1] = { 0 };
320 struct lirc_buffer *rbuf = ir->l.rbuf;
324 if (lirc_buffer_full(rbuf)) {
325 dev_dbg(ir->l.dev, "buffer overflow\n");
333 /* Ensure our rx->c i2c_client remains valid for the duration */
334 mutex_lock(&rx->client_lock);
336 mutex_unlock(&rx->client_lock);
337 put_ir_rx(rx, false);
344 * service the device as long as it is returning
345 * data and we have space
348 if (kthread_should_stop()) {
354 * Lock i2c bus for the duration. RX/TX chips interfere so
357 mutex_lock(&ir->ir_lock);
359 if (kthread_should_stop()) {
360 mutex_unlock(&ir->ir_lock);
366 * Send random "poll command" (?) Windows driver does this
367 * and it is a good point to detect chip failure.
369 ret = i2c_master_send(rx->c, sendbuf, 1);
371 dev_err(ir->l.dev, "i2c_master_send failed with %d\n",
374 mutex_unlock(&ir->ir_lock);
375 dev_err(ir->l.dev, "unable to read from the IR chip "
376 "after 3 resets, giving up\n");
380 /* Looks like the chip crashed, reset it */
381 dev_err(ir->l.dev, "polling the IR receiver chip failed, "
384 set_current_state(TASK_UNINTERRUPTIBLE);
385 if (kthread_should_stop()) {
386 mutex_unlock(&ir->ir_lock);
390 schedule_timeout((100 * HZ + 999) / 1000);
395 mutex_unlock(&ir->ir_lock);
400 if (kthread_should_stop()) {
401 mutex_unlock(&ir->ir_lock);
405 ret = i2c_master_recv(rx->c, keybuf, sizeof(keybuf));
406 mutex_unlock(&ir->ir_lock);
407 if (ret != sizeof(keybuf)) {
408 dev_err(ir->l.dev, "i2c_master_recv failed with %d -- "
409 "keeping last read buffer\n", ret);
411 rx->b[0] = keybuf[3];
412 rx->b[1] = keybuf[4];
413 rx->b[2] = keybuf[5];
414 dev_dbg(ir->l.dev, "key (0x%02x/0x%02x)\n",
419 if (rx->hdpvr_data_fmt) {
420 if (got_data && (keybuf[0] == 0x80)) {
423 } else if (got_data && (keybuf[0] == 0x00)) {
427 } else if ((rx->b[0] & 0x80) == 0) {
428 ret = got_data ? 0 : -ENODATA;
432 /* look what we have */
433 code = (((__u16)rx->b[0] & 0x7f) << 6) | (rx->b[1] >> 2);
435 codes[0] = (code >> 8) & 0xff;
436 codes[1] = code & 0xff;
439 lirc_buffer_write(rbuf, codes);
442 } while (!lirc_buffer_full(rbuf));
444 mutex_unlock(&rx->client_lock);
446 put_ir_tx(tx, false);
447 put_ir_rx(rx, false);
452 * Main function of the polling thread -- from lirc_dev.
453 * We don't fit the LIRC model at all anymore. This is horrible, but
454 * basically we have a single RX/TX device with a nasty failure mode
455 * that needs to be accounted for across the pair. lirc lets us provide
456 * fops, but prevents us from using the internal polling, etc. if we do
457 * so. Hence the replication. Might be neater to extend the LIRC model
458 * to account for this but I'd think it's a very special case of seriously
459 * messed up hardware.
461 static int lirc_thread(void *arg)
464 struct lirc_buffer *rbuf = ir->l.rbuf;
466 dev_dbg(ir->l.dev, "poll thread started\n");
468 while (!kthread_should_stop()) {
469 set_current_state(TASK_INTERRUPTIBLE);
471 /* if device not opened, we can sleep half a second */
472 if (atomic_read(&ir->open_count) == 0) {
473 schedule_timeout(HZ/2);
478 * This is ~113*2 + 24 + jitter (2*repeat gap + code length).
479 * We use this interval as the chip resets every time you poll
480 * it (bad!). This is therefore just sufficient to catch all
481 * of the button presses. It makes the remote much more
482 * responsive. You can see the difference by running irw and
483 * holding down a button. With 100ms, the old polling
484 * interval, you'll notice breaks in the repeat sequence
485 * corresponding to lost keypresses.
487 schedule_timeout((260 * HZ) / 1000);
488 if (kthread_should_stop())
491 wake_up_interruptible(&rbuf->wait_poll);
494 dev_dbg(ir->l.dev, "poll thread ended\n");
498 static int set_use_inc(void *data)
503 static void set_use_dec(void *data)
507 /* safe read of a uint32 (always network byte order) */
508 static int read_uint32(unsigned char **data,
509 unsigned char *endp, unsigned int *val)
511 if (*data + 4 > endp)
513 *val = ((*data)[0] << 24) | ((*data)[1] << 16) |
514 ((*data)[2] << 8) | (*data)[3];
519 /* safe read of a uint8 */
520 static int read_uint8(unsigned char **data,
521 unsigned char *endp, unsigned char *val)
523 if (*data + 1 > endp)
529 /* safe skipping of N bytes */
530 static int skip(unsigned char **data,
531 unsigned char *endp, unsigned int distance)
533 if (*data + distance > endp)
539 /* decompress key data into the given buffer */
540 static int get_key_data(unsigned char *buf,
541 unsigned int codeset, unsigned int key)
543 unsigned char *data, *endp, *diffs, *key_block;
544 unsigned char keys, ndiffs, id;
545 unsigned int base, lim, pos, i;
547 /* Binary search for the codeset */
548 for (base = 0, lim = tx_data->num_code_sets; lim; lim >>= 1) {
549 pos = base + (lim >> 1);
550 data = tx_data->code_sets[pos];
552 if (!read_uint32(&data, tx_data->endp, &i))
557 else if (codeset > i) {
566 /* Set end of data block */
567 endp = pos < tx_data->num_code_sets - 1 ?
568 tx_data->code_sets[pos + 1] : tx_data->endp;
570 /* Read the block header */
571 if (!read_uint8(&data, endp, &keys) ||
572 !read_uint8(&data, endp, &ndiffs) ||
573 ndiffs > TX_BLOCK_SIZE || keys == 0)
576 /* Save diffs & skip */
578 if (!skip(&data, endp, ndiffs))
581 /* Read the id of the first key */
582 if (!read_uint8(&data, endp, &id))
585 /* Unpack the first key's data */
586 for (i = 0; i < TX_BLOCK_SIZE; ++i) {
587 if (tx_data->fixed[i] == -1) {
588 if (!read_uint8(&data, endp, &buf[i]))
591 buf[i] = (unsigned char)tx_data->fixed[i];
595 /* Early out key found/not found */
603 if (!skip(&data, endp, (keys - 1) * (ndiffs + 1)))
606 /* Binary search for the key */
607 for (base = 0, lim = keys - 1; lim; lim >>= 1) {
609 unsigned char *key_data;
611 pos = base + (lim >> 1);
612 key_data = key_block + (ndiffs + 1) * pos;
614 if (*key_data == key) {
618 /* found, so unpack the diffs */
619 for (i = 0; i < ndiffs; ++i) {
622 if (!read_uint8(&key_data, endp, &val) ||
623 diffs[i] >= TX_BLOCK_SIZE)
629 } else if (key > *key_data) {
638 pr_err("firmware is corrupt\n");
642 /* send a block of data to the IR TX device */
643 static int send_data_block(struct IR_tx *tx, unsigned char *data_block)
646 unsigned char buf[5];
648 for (i = 0; i < TX_BLOCK_SIZE;) {
649 int tosend = TX_BLOCK_SIZE - i;
653 buf[0] = (unsigned char)(i + 1);
654 for (j = 0; j < tosend; ++j)
655 buf[1 + j] = data_block[i + j];
656 dev_dbg(tx->ir->l.dev, "%*ph", 5, buf);
657 ret = i2c_master_send(tx->c, buf, tosend + 1);
658 if (ret != tosend + 1) {
659 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n",
661 return ret < 0 ? ret : -EFAULT;
668 /* send boot data to the IR TX device */
669 static int send_boot_data(struct IR_tx *tx)
672 unsigned char buf[4];
674 /* send the boot block */
675 ret = send_data_block(tx, tx_data->boot_data);
679 /* Hit the go button to activate the new boot data */
682 ret = i2c_master_send(tx->c, buf, 2);
684 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
685 return ret < 0 ? ret : -EFAULT;
689 * Wait for zilog to settle after hitting go post boot block upload.
690 * Without this delay, the HD-PVR and HVR-1950 both return an -EIO
691 * upon attempting to get firmware revision, and tx probe thus fails.
693 for (i = 0; i < 10; i++) {
694 ret = i2c_master_send(tx->c, buf, 1);
701 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
702 return ret < 0 ? ret : -EFAULT;
705 /* Here comes the firmware version... (hopefully) */
706 ret = i2c_master_recv(tx->c, buf, 4);
708 dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
711 if ((buf[0] != 0x80) && (buf[0] != 0xa0)) {
712 dev_err(tx->ir->l.dev, "unexpected IR TX init response: %02x\n",
716 dev_notice(tx->ir->l.dev, "Zilog/Hauppauge IR blaster firmware version "
717 "%d.%d.%d loaded\n", buf[1], buf[2], buf[3]);
722 /* unload "firmware", lock held */
723 static void fw_unload_locked(void)
726 vfree(tx_data->code_sets);
728 vfree(tx_data->datap);
732 pr_debug("successfully unloaded IR blaster firmware\n");
736 /* unload "firmware" for the IR TX device */
737 static void fw_unload(void)
739 mutex_lock(&tx_data_lock);
741 mutex_unlock(&tx_data_lock);
744 /* load "firmware" for the IR TX device */
745 static int fw_load(struct IR_tx *tx)
749 unsigned char *data, version, num_global_fixed;
750 const struct firmware *fw_entry;
752 /* Already loaded? */
753 mutex_lock(&tx_data_lock);
759 /* Request codeset data file */
760 ret = request_firmware(&fw_entry, "haup-ir-blaster.bin", tx->ir->l.dev);
762 dev_err(tx->ir->l.dev, "firmware haup-ir-blaster.bin not available (%d)\n",
764 ret = ret < 0 ? ret : -EFAULT;
767 dev_dbg(tx->ir->l.dev, "firmware of size %zu loaded\n", fw_entry->size);
770 tx_data = vmalloc(sizeof(*tx_data));
771 if (tx_data == NULL) {
772 release_firmware(fw_entry);
776 tx_data->code_sets = NULL;
778 /* Copy the data so hotplug doesn't get confused and timeout */
779 tx_data->datap = vmalloc(fw_entry->size);
780 if (tx_data->datap == NULL) {
781 release_firmware(fw_entry);
786 memcpy(tx_data->datap, fw_entry->data, fw_entry->size);
787 tx_data->endp = tx_data->datap + fw_entry->size;
788 release_firmware(fw_entry); fw_entry = NULL;
791 data = tx_data->datap;
792 if (!read_uint8(&data, tx_data->endp, &version))
795 dev_err(tx->ir->l.dev, "unsupported code set file version (%u, expected"
796 "1) -- please upgrade to a newer driver",
803 /* Save boot block for later */
804 tx_data->boot_data = data;
805 if (!skip(&data, tx_data->endp, TX_BLOCK_SIZE))
808 if (!read_uint32(&data, tx_data->endp,
809 &tx_data->num_code_sets))
812 dev_dbg(tx->ir->l.dev, "%u IR blaster codesets loaded\n",
813 tx_data->num_code_sets);
815 tx_data->code_sets = vmalloc(
816 tx_data->num_code_sets * sizeof(char *));
817 if (tx_data->code_sets == NULL) {
823 for (i = 0; i < TX_BLOCK_SIZE; ++i)
824 tx_data->fixed[i] = -1;
826 /* Read global fixed data template */
827 if (!read_uint8(&data, tx_data->endp, &num_global_fixed) ||
828 num_global_fixed > TX_BLOCK_SIZE)
830 for (i = 0; i < num_global_fixed; ++i) {
831 unsigned char pos, val;
833 if (!read_uint8(&data, tx_data->endp, &pos) ||
834 !read_uint8(&data, tx_data->endp, &val) ||
835 pos >= TX_BLOCK_SIZE)
837 tx_data->fixed[pos] = (int)val;
840 /* Filch out the position of each code set */
841 for (i = 0; i < tx_data->num_code_sets; ++i) {
844 unsigned char ndiffs;
846 /* Save the codeset position */
847 tx_data->code_sets[i] = data;
850 if (!read_uint32(&data, tx_data->endp, &id) ||
851 !read_uint8(&data, tx_data->endp, &keys) ||
852 !read_uint8(&data, tx_data->endp, &ndiffs) ||
853 ndiffs > TX_BLOCK_SIZE || keys == 0)
856 /* skip diff positions */
857 if (!skip(&data, tx_data->endp, ndiffs))
861 * After the diffs we have the first key id + data -
864 if (!skip(&data, tx_data->endp,
865 1 + TX_BLOCK_SIZE - num_global_fixed))
868 /* Then we have keys-1 blocks of key id+diffs */
869 if (!skip(&data, tx_data->endp,
870 (ndiffs + 1) * (keys - 1)))
877 dev_err(tx->ir->l.dev, "firmware is corrupt\n");
882 mutex_unlock(&tx_data_lock);
886 /* copied from lirc_dev */
887 static ssize_t read(struct file *filep, char __user *outbuf, size_t n,
890 struct IR *ir = filep->private_data;
892 struct lirc_buffer *rbuf = ir->l.rbuf;
893 int ret = 0, written = 0, retries = 0;
895 DECLARE_WAITQUEUE(wait, current);
897 dev_dbg(ir->l.dev, "read called\n");
898 if (n % rbuf->chunk_size) {
899 dev_dbg(ir->l.dev, "read result = -EINVAL\n");
908 * we add ourselves to the task queue before buffer check
909 * to avoid losing scan code (in case when queue is awaken somewhere
910 * between while condition checking and scheduling)
912 add_wait_queue(&rbuf->wait_poll, &wait);
913 set_current_state(TASK_INTERRUPTIBLE);
916 * while we didn't provide 'length' bytes, device is opened in blocking
917 * mode and 'copy_to_user' is happy, wait for data.
919 while (written < n && ret == 0) {
920 if (lirc_buffer_empty(rbuf)) {
922 * According to the read(2) man page, 'written' can be
923 * returned as less than 'n', instead of blocking
924 * again, returning -EWOULDBLOCK, or returning
929 if (filep->f_flags & O_NONBLOCK) {
933 if (signal_pending(current)) {
938 set_current_state(TASK_INTERRUPTIBLE);
940 unsigned char buf[MAX_XFER_SIZE];
942 if (rbuf->chunk_size > sizeof(buf)) {
943 dev_err(ir->l.dev, "chunk_size is too big (%d)!\n",
948 m = lirc_buffer_read(rbuf, buf);
949 if (m == rbuf->chunk_size) {
950 ret = copy_to_user(outbuf + written, buf,
952 written += rbuf->chunk_size;
957 dev_err(ir->l.dev, "Buffer read failed!\n");
963 remove_wait_queue(&rbuf->wait_poll, &wait);
964 put_ir_rx(rx, false);
965 set_current_state(TASK_RUNNING);
967 dev_dbg(ir->l.dev, "read result = %d (%s)\n",
968 ret, ret ? "Error" : "OK");
970 return ret ? ret : written;
973 /* send a keypress to the IR TX device */
974 static int send_code(struct IR_tx *tx, unsigned int code, unsigned int key)
976 unsigned char data_block[TX_BLOCK_SIZE];
977 unsigned char buf[2];
980 /* Get data for the codeset/key */
981 ret = get_key_data(data_block, code, key);
983 if (ret == -EPROTO) {
984 dev_err(tx->ir->l.dev, "failed to get data for code %u, key %u -- check "
985 "lircd.conf entries\n", code, key);
990 /* Send the data block */
991 ret = send_data_block(tx, data_block);
995 /* Send data block length? */
998 ret = i2c_master_send(tx->c, buf, 2);
1000 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
1001 return ret < 0 ? ret : -EFAULT;
1004 /* Give the z8 a moment to process data block */
1005 for (i = 0; i < 10; i++) {
1006 ret = i2c_master_send(tx->c, buf, 1);
1013 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
1014 return ret < 0 ? ret : -EFAULT;
1017 /* Send finished download? */
1018 ret = i2c_master_recv(tx->c, buf, 1);
1020 dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
1021 return ret < 0 ? ret : -EFAULT;
1023 if (buf[0] != 0xA0) {
1024 dev_err(tx->ir->l.dev, "unexpected IR TX response #1: %02x\n",
1029 /* Send prepare command? */
1032 ret = i2c_master_send(tx->c, buf, 2);
1034 dev_err(tx->ir->l.dev, "i2c_master_send failed with %d\n", ret);
1035 return ret < 0 ? ret : -EFAULT;
1039 * The sleep bits aren't necessary on the HD PVR, and in fact, the
1040 * last i2c_master_recv always fails with a -5, so for now, we're
1041 * going to skip this whole mess and say we're done on the HD PVR
1043 if (!tx->post_tx_ready_poll) {
1044 dev_dbg(tx->ir->l.dev, "sent code %u, key %u\n", code, key);
1049 * This bit NAKs until the device is ready, so we retry it
1050 * sleeping a bit each time. This seems to be what the windows
1051 * driver does, approximately.
1054 for (i = 0; i < 20; ++i) {
1055 set_current_state(TASK_UNINTERRUPTIBLE);
1056 schedule_timeout((50 * HZ + 999) / 1000);
1057 ret = i2c_master_send(tx->c, buf, 1);
1060 dev_dbg(tx->ir->l.dev, "NAK expected: i2c_master_send "
1061 "failed with %d (try %d)\n", ret, i+1);
1064 dev_err(tx->ir->l.dev, "IR TX chip never got ready: last i2c_master_send "
1065 "failed with %d\n", ret);
1066 return ret < 0 ? ret : -EFAULT;
1069 /* Seems to be an 'ok' response */
1070 i = i2c_master_recv(tx->c, buf, 1);
1072 dev_err(tx->ir->l.dev, "i2c_master_recv failed with %d\n", ret);
1075 if (buf[0] != 0x80) {
1076 dev_err(tx->ir->l.dev, "unexpected IR TX response #2: %02x\n",
1081 /* Oh good, it worked */
1082 dev_dbg(tx->ir->l.dev, "sent code %u, key %u\n", code, key);
1087 * Write a code to the device. We take in a 32-bit number (an int) and then
1088 * decode this to a codeset/key index. The key data is then decompressed and
1089 * sent to the device. We have a spin lock as per i2c documentation to prevent
1090 * multiple concurrent sends which would probably cause the device to explode.
1092 static ssize_t write(struct file *filep, const char __user *buf, size_t n,
1095 struct IR *ir = filep->private_data;
1100 /* Validate user parameters */
1101 if (n % sizeof(int))
1104 /* Get a struct IR_tx reference */
1109 /* Ensure our tx->c i2c_client remains valid for the duration */
1110 mutex_lock(&tx->client_lock);
1111 if (tx->c == NULL) {
1112 mutex_unlock(&tx->client_lock);
1113 put_ir_tx(tx, false);
1117 /* Lock i2c bus for the duration */
1118 mutex_lock(&ir->ir_lock);
1120 /* Send each keypress */
1121 for (i = 0; i < n;) {
1125 if (copy_from_user(&command, buf + i, sizeof(command))) {
1126 mutex_unlock(&ir->ir_lock);
1127 mutex_unlock(&tx->client_lock);
1128 put_ir_tx(tx, false);
1132 /* Send boot data first if required */
1133 if (tx->need_boot == 1) {
1134 /* Make sure we have the 'firmware' loaded, first */
1137 mutex_unlock(&ir->ir_lock);
1138 mutex_unlock(&tx->client_lock);
1139 put_ir_tx(tx, false);
1144 /* Prep the chip for transmitting codes */
1145 ret = send_boot_data(tx);
1152 ret = send_code(tx, (unsigned)command >> 16,
1153 (unsigned)command & 0xFFFF);
1154 if (ret == -EPROTO) {
1155 mutex_unlock(&ir->ir_lock);
1156 mutex_unlock(&tx->client_lock);
1157 put_ir_tx(tx, false);
1163 * Hmm, a failure. If we've had a few then give up, otherwise
1167 /* Looks like the chip crashed, reset it */
1168 dev_err(tx->ir->l.dev, "sending to the IR transmitter chip "
1169 "failed, trying reset\n");
1171 if (failures >= 3) {
1172 dev_err(tx->ir->l.dev, "unable to send to the IR chip "
1173 "after 3 resets, giving up\n");
1174 mutex_unlock(&ir->ir_lock);
1175 mutex_unlock(&tx->client_lock);
1176 put_ir_tx(tx, false);
1179 set_current_state(TASK_UNINTERRUPTIBLE);
1180 schedule_timeout((100 * HZ + 999) / 1000);
1187 /* Release i2c bus */
1188 mutex_unlock(&ir->ir_lock);
1190 mutex_unlock(&tx->client_lock);
1192 /* Give back our struct IR_tx reference */
1193 put_ir_tx(tx, false);
1195 /* All looks good */
1199 /* copied from lirc_dev */
1200 static unsigned int poll(struct file *filep, poll_table *wait)
1202 struct IR *ir = filep->private_data;
1204 struct lirc_buffer *rbuf = ir->l.rbuf;
1207 dev_dbg(ir->l.dev, "poll called\n");
1212 * Revisit this, if our poll function ever reports writeable
1215 dev_dbg(ir->l.dev, "poll result = POLLERR\n");
1220 * Add our lirc_buffer's wait_queue to the poll_table. A wake up on
1221 * that buffer's wait queue indicates we may have a new poll status.
1223 poll_wait(filep, &rbuf->wait_poll, wait);
1225 /* Indicate what ops could happen immediately without blocking */
1226 ret = lirc_buffer_empty(rbuf) ? 0 : (POLLIN|POLLRDNORM);
1228 dev_dbg(ir->l.dev, "poll result = %s\n",
1229 ret ? "POLLIN|POLLRDNORM" : "none");
1233 static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
1235 struct IR *ir = filep->private_data;
1236 unsigned long __user *uptr = (unsigned long __user *)arg;
1238 unsigned long mode, features;
1240 features = ir->l.features;
1243 case LIRC_GET_LENGTH:
1244 result = put_user(13UL, uptr);
1246 case LIRC_GET_FEATURES:
1247 result = put_user(features, uptr);
1249 case LIRC_GET_REC_MODE:
1250 if (!(features&LIRC_CAN_REC_MASK))
1253 result = put_user(LIRC_REC2MODE
1254 (features&LIRC_CAN_REC_MASK),
1257 case LIRC_SET_REC_MODE:
1258 if (!(features&LIRC_CAN_REC_MASK))
1261 result = get_user(mode, uptr);
1262 if (!result && !(LIRC_MODE2REC(mode) & features))
1265 case LIRC_GET_SEND_MODE:
1266 if (!(features&LIRC_CAN_SEND_MASK))
1269 result = put_user(LIRC_MODE_PULSE, uptr);
1271 case LIRC_SET_SEND_MODE:
1272 if (!(features&LIRC_CAN_SEND_MASK))
1275 result = get_user(mode, uptr);
1276 if (!result && mode != LIRC_MODE_PULSE)
1285 static struct IR *get_ir_device_by_minor(unsigned int minor)
1288 struct IR *ret = NULL;
1290 mutex_lock(&ir_devices_lock);
1292 if (!list_empty(&ir_devices_list)) {
1293 list_for_each_entry(ir, &ir_devices_list, list) {
1294 if (ir->l.minor == minor) {
1295 ret = get_ir_device(ir, true);
1301 mutex_unlock(&ir_devices_lock);
1306 * Open the IR device. Get hold of our IR structure and
1307 * stash it in private_data for the file
1309 static int open(struct inode *node, struct file *filep)
1312 unsigned int minor = MINOR(node->i_rdev);
1314 /* find our IR struct */
1315 ir = get_ir_device_by_minor(minor);
1320 atomic_inc(&ir->open_count);
1322 /* stash our IR struct */
1323 filep->private_data = ir;
1325 nonseekable_open(node, filep);
1329 /* Close the IR device */
1330 static int close(struct inode *node, struct file *filep)
1332 /* find our IR struct */
1333 struct IR *ir = filep->private_data;
1336 dev_err(ir->l.dev, "close: no private_data attached to the file!\n");
1340 atomic_dec(&ir->open_count);
1342 put_ir_device(ir, false);
1346 static int ir_remove(struct i2c_client *client);
1347 static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id);
1349 #define ID_FLAG_TX 0x01
1350 #define ID_FLAG_HDPVR 0x02
1352 static const struct i2c_device_id ir_transceiver_id[] = {
1353 { "ir_tx_z8f0811_haup", ID_FLAG_TX },
1354 { "ir_rx_z8f0811_haup", 0 },
1355 { "ir_tx_z8f0811_hdpvr", ID_FLAG_HDPVR | ID_FLAG_TX },
1356 { "ir_rx_z8f0811_hdpvr", ID_FLAG_HDPVR },
1360 static struct i2c_driver driver = {
1362 .owner = THIS_MODULE,
1363 .name = "Zilog/Hauppauge i2c IR",
1366 .remove = ir_remove,
1367 .id_table = ir_transceiver_id,
1370 static const struct file_operations lirc_fops = {
1371 .owner = THIS_MODULE,
1372 .llseek = no_llseek,
1376 .unlocked_ioctl = ioctl,
1377 #ifdef CONFIG_COMPAT
1378 .compat_ioctl = ioctl,
1384 static struct lirc_driver lirc_template = {
1385 .name = "lirc_zilog",
1388 .buffer_size = BUFLEN / 2,
1389 .sample_rate = 0, /* tell lirc_dev to not start its own kthread */
1391 .set_use_inc = set_use_inc,
1392 .set_use_dec = set_use_dec,
1394 .owner = THIS_MODULE,
1397 static int ir_remove(struct i2c_client *client)
1399 if (strncmp("ir_tx_z8", client->name, 8) == 0) {
1400 struct IR_tx *tx = i2c_get_clientdata(client);
1403 mutex_lock(&tx->client_lock);
1405 mutex_unlock(&tx->client_lock);
1406 put_ir_tx(tx, false);
1408 } else if (strncmp("ir_rx_z8", client->name, 8) == 0) {
1409 struct IR_rx *rx = i2c_get_clientdata(client);
1412 mutex_lock(&rx->client_lock);
1414 mutex_unlock(&rx->client_lock);
1415 put_ir_rx(rx, false);
1422 /* ir_devices_lock must be held */
1423 static struct IR *get_ir_device_by_adapter(struct i2c_adapter *adapter)
1427 if (list_empty(&ir_devices_list))
1430 list_for_each_entry(ir, &ir_devices_list, list)
1431 if (ir->adapter == adapter) {
1432 get_ir_device(ir, true);
1439 static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
1444 struct i2c_adapter *adap = client->adapter;
1446 bool tx_probe = false;
1448 dev_dbg(&client->dev, "%s: %s on i2c-%d (%s), client addr=0x%02x\n",
1449 __func__, id->name, adap->nr, adap->name, client->addr);
1452 * The IR receiver is at i2c address 0x71.
1453 * The IR transmitter is at i2c address 0x70.
1456 if (id->driver_data & ID_FLAG_TX)
1458 else if (tx_only) /* module option */
1461 pr_info("probing IR %s on %s (i2c-%d)\n",
1462 tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
1464 mutex_lock(&ir_devices_lock);
1466 /* Use a single struct IR instance for both the Rx and Tx functions */
1467 ir = get_ir_device_by_adapter(adap);
1469 ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
1474 kref_init(&ir->ref);
1476 /* store for use in ir_probe() again, and open() later on */
1477 INIT_LIST_HEAD(&ir->list);
1478 list_add_tail(&ir->list, &ir_devices_list);
1481 mutex_init(&ir->ir_lock);
1482 atomic_set(&ir->open_count, 0);
1483 spin_lock_init(&ir->tx_ref_lock);
1484 spin_lock_init(&ir->rx_ref_lock);
1486 /* set lirc_dev stuff */
1487 memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver));
1489 * FIXME this is a pointer reference to us, but no refcount.
1491 * This OK for now, since lirc_dev currently won't touch this
1492 * buffer as we provide our own lirc_fops.
1494 * Currently our own lirc_fops rely on this ir->l.rbuf pointer
1496 ir->l.rbuf = &ir->rbuf;
1497 ir->l.dev = &adap->dev;
1498 ret = lirc_buffer_init(ir->l.rbuf,
1499 ir->l.chunk_size, ir->l.buffer_size);
1505 /* Get the IR_rx instance for later, if already allocated */
1508 /* Set up a struct IR_tx instance */
1509 tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL);
1514 kref_init(&tx->ref);
1517 ir->l.features |= LIRC_CAN_SEND_PULSE;
1518 mutex_init(&tx->client_lock);
1521 tx->post_tx_ready_poll =
1522 (id->driver_data & ID_FLAG_HDPVR) ? false : true;
1524 /* An ir ref goes to the struct IR_tx instance */
1525 tx->ir = get_ir_device(ir, true);
1527 /* A tx ref goes to the i2c_client */
1528 i2c_set_clientdata(client, get_ir_tx(ir));
1531 * Load the 'firmware'. We do this before registering with
1532 * lirc_dev, so the first firmware load attempt does not happen
1533 * after a open() or write() call on the device.
1535 * Failure here is not deemed catastrophic, so the receiver will
1536 * still be usable. Firmware load will be retried in write(),
1541 /* Proceed only if the Rx client is also ready or not needed */
1542 if (rx == NULL && !tx_only) {
1543 dev_info(tx->ir->l.dev, "probe of IR Tx on %s (i2c-%d) done. Waiting"
1544 " on IR Rx.\n", adap->name, adap->nr);
1548 /* Get the IR_tx instance for later, if already allocated */
1551 /* Set up a struct IR_rx instance */
1552 rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL);
1557 kref_init(&rx->ref);
1560 ir->l.features |= LIRC_CAN_REC_LIRCCODE;
1561 mutex_init(&rx->client_lock);
1563 rx->hdpvr_data_fmt =
1564 (id->driver_data & ID_FLAG_HDPVR) ? true : false;
1566 /* An ir ref goes to the struct IR_rx instance */
1567 rx->ir = get_ir_device(ir, true);
1569 /* An rx ref goes to the i2c_client */
1570 i2c_set_clientdata(client, get_ir_rx(ir));
1573 * Start the polling thread.
1574 * It will only perform an empty loop around schedule_timeout()
1575 * until we register with lirc_dev and the first user open()
1577 /* An ir ref goes to the new rx polling kthread */
1578 rx->task = kthread_run(lirc_thread, get_ir_device(ir, true),
1579 "zilog-rx-i2c-%d", adap->nr);
1580 if (IS_ERR(rx->task)) {
1581 ret = PTR_ERR(rx->task);
1582 dev_err(tx->ir->l.dev, "%s: could not start IR Rx polling thread"
1584 /* Failed kthread, so put back the ir ref */
1585 put_ir_device(ir, true);
1586 /* Failure exit, so put back rx ref from i2c_client */
1587 i2c_set_clientdata(client, NULL);
1588 put_ir_rx(rx, true);
1589 ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
1593 /* Proceed only if the Tx client is also ready */
1595 pr_info("probe of IR Rx on %s (i2c-%d) done. Waiting"
1596 " on IR Tx.\n", adap->name, adap->nr);
1601 /* register with lirc */
1602 ir->l.minor = minor; /* module option: user requested minor number */
1603 ir->l.minor = lirc_register_driver(&ir->l);
1604 if (ir->l.minor < 0 || ir->l.minor >= MAX_IRCTL_DEVICES) {
1605 dev_err(tx->ir->l.dev, "%s: \"minor\" must be between 0 and %d (%d)!\n",
1606 __func__, MAX_IRCTL_DEVICES-1, ir->l.minor);
1610 dev_info(ir->l.dev, "IR unit on %s (i2c-%d) registered as lirc%d and ready\n",
1611 adap->name, adap->nr, ir->l.minor);
1615 put_ir_rx(rx, true);
1617 put_ir_tx(tx, true);
1618 put_ir_device(ir, true);
1619 dev_info(ir->l.dev, "probe of IR %s on %s (i2c-%d) done\n",
1620 tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
1621 mutex_unlock(&ir_devices_lock);
1626 put_ir_rx(rx, true);
1628 put_ir_tx(tx, true);
1630 put_ir_device(ir, true);
1632 dev_err(&client->dev, "%s: probing IR %s on %s (i2c-%d) failed with %d\n",
1633 __func__, tx_probe ? "Tx" : "Rx", adap->name, adap->nr,
1635 mutex_unlock(&ir_devices_lock);
1639 static int __init zilog_init(void)
1643 pr_notice("Zilog/Hauppauge IR driver initializing\n");
1645 mutex_init(&tx_data_lock);
1647 request_module("firmware_class");
1649 ret = i2c_add_driver(&driver);
1651 pr_err("initialization failed\n");
1653 pr_notice("initialization complete\n");
1658 static void __exit zilog_exit(void)
1660 i2c_del_driver(&driver);
1663 pr_notice("Zilog/Hauppauge IR driver unloaded\n");
1666 module_init(zilog_init);
1667 module_exit(zilog_exit);
1669 MODULE_DESCRIPTION("Zilog/Hauppauge infrared transmitter driver (i2c stack)");
1670 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
1671 "Ulrich Mueller, Stefan Jahn, Jerome Brock, Mark Weaver, "
1673 MODULE_LICENSE("GPL");
1674 /* for compat with old name, which isn't all that accurate anymore */
1675 MODULE_ALIAS("lirc_pvr150");
1677 module_param(minor, int, 0444);
1678 MODULE_PARM_DESC(minor, "Preferred minor device number");
1680 module_param(debug, bool, 0644);
1681 MODULE_PARM_DESC(debug, "Enable debugging messages");
1683 module_param(tx_only, bool, 0644);
1684 MODULE_PARM_DESC(tx_only, "Only handle the IR transmit function");