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;
155 #define zilog_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, \
157 #define zilog_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
158 #define zilog_info(s, args...) printk(KERN_INFO KBUILD_MODNAME ": " s, ## args)
160 /* module parameters */
161 static bool debug; /* debug output */
162 static bool tx_only; /* only handle the IR Tx function */
163 static int minor = -1; /* minor number */
165 #define dprintk(fmt, args...) \
168 printk(KERN_DEBUG KBUILD_MODNAME ": " fmt, \
173 /* struct IR reference counting */
174 static struct IR *get_ir_device(struct IR *ir, bool ir_devices_lock_held)
176 if (ir_devices_lock_held) {
179 mutex_lock(&ir_devices_lock);
181 mutex_unlock(&ir_devices_lock);
186 static void release_ir_device(struct kref *ref)
188 struct IR *ir = container_of(ref, struct IR, ref);
191 * Things should be in this state by now:
192 * ir->rx set to NULL and deallocated - happens before ir->rx->ir put()
193 * ir->rx->task kthread stopped - happens before ir->rx->ir put()
194 * ir->tx set to NULL and deallocated - happens before ir->tx->ir put()
195 * ir->open_count == 0 - happens on final close()
196 * ir_lock, tx_ref_lock, rx_ref_lock, all released
198 if (ir->l.minor >= 0 && ir->l.minor < MAX_IRCTL_DEVICES) {
199 lirc_unregister_driver(ir->l.minor);
200 ir->l.minor = MAX_IRCTL_DEVICES;
202 if (ir->rbuf.fifo_initialized)
203 lirc_buffer_free(&ir->rbuf);
208 static int put_ir_device(struct IR *ir, bool ir_devices_lock_held)
212 if (ir_devices_lock_held)
213 return kref_put(&ir->ref, release_ir_device);
215 mutex_lock(&ir_devices_lock);
216 released = kref_put(&ir->ref, release_ir_device);
217 mutex_unlock(&ir_devices_lock);
222 /* struct IR_rx reference counting */
223 static struct IR_rx *get_ir_rx(struct IR *ir)
227 spin_lock(&ir->rx_ref_lock);
231 spin_unlock(&ir->rx_ref_lock);
235 static void destroy_rx_kthread(struct IR_rx *rx, bool ir_devices_lock_held)
237 /* end up polling thread */
238 if (!IS_ERR_OR_NULL(rx->task)) {
239 kthread_stop(rx->task);
241 /* Put the ir ptr that ir_probe() gave to the rx poll thread */
242 put_ir_device(rx->ir, ir_devices_lock_held);
246 static void release_ir_rx(struct kref *ref)
248 struct IR_rx *rx = container_of(ref, struct IR_rx, ref);
249 struct IR *ir = rx->ir;
252 * This release function can't do all the work, as we want
253 * to keep the rx_ref_lock a spinlock, and killing the poll thread
254 * and releasing the ir reference can cause a sleep. That work is
255 * performed by put_ir_rx()
257 ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
258 /* Don't put_ir_device(rx->ir) here; lock can't be freed yet */
260 /* Don't do the kfree(rx) here; we still need to kill the poll thread */
263 static int put_ir_rx(struct IR_rx *rx, bool ir_devices_lock_held)
266 struct IR *ir = rx->ir;
268 spin_lock(&ir->rx_ref_lock);
269 released = kref_put(&rx->ref, release_ir_rx);
270 spin_unlock(&ir->rx_ref_lock);
271 /* Destroy the rx kthread while not holding the spinlock */
273 destroy_rx_kthread(rx, ir_devices_lock_held);
275 /* Make sure we're not still in a poll_table somewhere */
276 wake_up_interruptible(&ir->rbuf.wait_poll);
278 /* Do a reference put() for the rx->ir reference, if we released rx */
280 put_ir_device(ir, ir_devices_lock_held);
284 /* struct IR_tx reference counting */
285 static struct IR_tx *get_ir_tx(struct IR *ir)
289 spin_lock(&ir->tx_ref_lock);
293 spin_unlock(&ir->tx_ref_lock);
297 static void release_ir_tx(struct kref *ref)
299 struct IR_tx *tx = container_of(ref, struct IR_tx, ref);
300 struct IR *ir = tx->ir;
302 ir->l.features &= ~LIRC_CAN_SEND_PULSE;
303 /* Don't put_ir_device(tx->ir) here, so our lock doesn't get freed */
308 static int put_ir_tx(struct IR_tx *tx, bool ir_devices_lock_held)
311 struct IR *ir = tx->ir;
313 spin_lock(&ir->tx_ref_lock);
314 released = kref_put(&tx->ref, release_ir_tx);
315 spin_unlock(&ir->tx_ref_lock);
316 /* Do a reference put() for the tx->ir reference, if we released tx */
318 put_ir_device(ir, ir_devices_lock_held);
322 static int add_to_buf(struct IR *ir)
325 unsigned char codes[2];
326 unsigned char keybuf[6];
330 unsigned char sendbuf[1] = { 0 };
331 struct lirc_buffer *rbuf = ir->l.rbuf;
335 if (lirc_buffer_full(rbuf)) {
336 dprintk("buffer overflow\n");
344 /* Ensure our rx->c i2c_client remains valid for the duration */
345 mutex_lock(&rx->client_lock);
347 mutex_unlock(&rx->client_lock);
348 put_ir_rx(rx, false);
355 * service the device as long as it is returning
356 * data and we have space
359 if (kthread_should_stop()) {
365 * Lock i2c bus for the duration. RX/TX chips interfere so
368 mutex_lock(&ir->ir_lock);
370 if (kthread_should_stop()) {
371 mutex_unlock(&ir->ir_lock);
377 * Send random "poll command" (?) Windows driver does this
378 * and it is a good point to detect chip failure.
380 ret = i2c_master_send(rx->c, sendbuf, 1);
382 zilog_error("i2c_master_send failed with %d\n", ret);
384 mutex_unlock(&ir->ir_lock);
385 zilog_error("unable to read from the IR chip "
386 "after 3 resets, giving up\n");
390 /* Looks like the chip crashed, reset it */
391 zilog_error("polling the IR receiver chip failed, "
394 set_current_state(TASK_UNINTERRUPTIBLE);
395 if (kthread_should_stop()) {
396 mutex_unlock(&ir->ir_lock);
400 schedule_timeout((100 * HZ + 999) / 1000);
405 mutex_unlock(&ir->ir_lock);
410 if (kthread_should_stop()) {
411 mutex_unlock(&ir->ir_lock);
415 ret = i2c_master_recv(rx->c, keybuf, sizeof(keybuf));
416 mutex_unlock(&ir->ir_lock);
417 if (ret != sizeof(keybuf)) {
418 zilog_error("i2c_master_recv failed with %d -- "
419 "keeping last read buffer\n", ret);
421 rx->b[0] = keybuf[3];
422 rx->b[1] = keybuf[4];
423 rx->b[2] = keybuf[5];
424 dprintk("key (0x%02x/0x%02x)\n", rx->b[0], rx->b[1]);
428 if (rx->hdpvr_data_fmt) {
429 if (got_data && (keybuf[0] == 0x80)) {
432 } else if (got_data && (keybuf[0] == 0x00)) {
436 } else if ((rx->b[0] & 0x80) == 0) {
437 ret = got_data ? 0 : -ENODATA;
441 /* look what we have */
442 code = (((__u16)rx->b[0] & 0x7f) << 6) | (rx->b[1] >> 2);
444 codes[0] = (code >> 8) & 0xff;
445 codes[1] = code & 0xff;
448 lirc_buffer_write(rbuf, codes);
451 } while (!lirc_buffer_full(rbuf));
453 mutex_unlock(&rx->client_lock);
455 put_ir_tx(tx, false);
456 put_ir_rx(rx, false);
461 * Main function of the polling thread -- from lirc_dev.
462 * We don't fit the LIRC model at all anymore. This is horrible, but
463 * basically we have a single RX/TX device with a nasty failure mode
464 * that needs to be accounted for across the pair. lirc lets us provide
465 * fops, but prevents us from using the internal polling, etc. if we do
466 * so. Hence the replication. Might be neater to extend the LIRC model
467 * to account for this but I'd think it's a very special case of seriously
468 * messed up hardware.
470 static int lirc_thread(void *arg)
473 struct lirc_buffer *rbuf = ir->l.rbuf;
475 dprintk("poll thread started\n");
477 while (!kthread_should_stop()) {
478 set_current_state(TASK_INTERRUPTIBLE);
480 /* if device not opened, we can sleep half a second */
481 if (atomic_read(&ir->open_count) == 0) {
482 schedule_timeout(HZ/2);
487 * This is ~113*2 + 24 + jitter (2*repeat gap + code length).
488 * We use this interval as the chip resets every time you poll
489 * it (bad!). This is therefore just sufficient to catch all
490 * of the button presses. It makes the remote much more
491 * responsive. You can see the difference by running irw and
492 * holding down a button. With 100ms, the old polling
493 * interval, you'll notice breaks in the repeat sequence
494 * corresponding to lost keypresses.
496 schedule_timeout((260 * HZ) / 1000);
497 if (kthread_should_stop())
500 wake_up_interruptible(&rbuf->wait_poll);
503 dprintk("poll thread ended\n");
507 static int set_use_inc(void *data)
512 static void set_use_dec(void *data)
516 /* safe read of a uint32 (always network byte order) */
517 static int read_uint32(unsigned char **data,
518 unsigned char *endp, unsigned int *val)
520 if (*data + 4 > endp)
522 *val = ((*data)[0] << 24) | ((*data)[1] << 16) |
523 ((*data)[2] << 8) | (*data)[3];
528 /* safe read of a uint8 */
529 static int read_uint8(unsigned char **data,
530 unsigned char *endp, unsigned char *val)
532 if (*data + 1 > endp)
538 /* safe skipping of N bytes */
539 static int skip(unsigned char **data,
540 unsigned char *endp, unsigned int distance)
542 if (*data + distance > endp)
548 /* decompress key data into the given buffer */
549 static int get_key_data(unsigned char *buf,
550 unsigned int codeset, unsigned int key)
552 unsigned char *data, *endp, *diffs, *key_block;
553 unsigned char keys, ndiffs, id;
554 unsigned int base, lim, pos, i;
556 /* Binary search for the codeset */
557 for (base = 0, lim = tx_data->num_code_sets; lim; lim >>= 1) {
558 pos = base + (lim >> 1);
559 data = tx_data->code_sets[pos];
561 if (!read_uint32(&data, tx_data->endp, &i))
566 else if (codeset > i) {
575 /* Set end of data block */
576 endp = pos < tx_data->num_code_sets - 1 ?
577 tx_data->code_sets[pos + 1] : tx_data->endp;
579 /* Read the block header */
580 if (!read_uint8(&data, endp, &keys) ||
581 !read_uint8(&data, endp, &ndiffs) ||
582 ndiffs > TX_BLOCK_SIZE || keys == 0)
585 /* Save diffs & skip */
587 if (!skip(&data, endp, ndiffs))
590 /* Read the id of the first key */
591 if (!read_uint8(&data, endp, &id))
594 /* Unpack the first key's data */
595 for (i = 0; i < TX_BLOCK_SIZE; ++i) {
596 if (tx_data->fixed[i] == -1) {
597 if (!read_uint8(&data, endp, &buf[i]))
600 buf[i] = (unsigned char)tx_data->fixed[i];
604 /* Early out key found/not found */
612 if (!skip(&data, endp, (keys - 1) * (ndiffs + 1)))
615 /* Binary search for the key */
616 for (base = 0, lim = keys - 1; lim; lim >>= 1) {
618 unsigned char *key_data;
620 pos = base + (lim >> 1);
621 key_data = key_block + (ndiffs + 1) * pos;
623 if (*key_data == key) {
627 /* found, so unpack the diffs */
628 for (i = 0; i < ndiffs; ++i) {
631 if (!read_uint8(&key_data, endp, &val) ||
632 diffs[i] >= TX_BLOCK_SIZE)
638 } else if (key > *key_data) {
647 zilog_error("firmware is corrupt\n");
651 /* send a block of data to the IR TX device */
652 static int send_data_block(struct IR_tx *tx, unsigned char *data_block)
655 unsigned char buf[5];
657 for (i = 0; i < TX_BLOCK_SIZE;) {
658 int tosend = TX_BLOCK_SIZE - i;
662 buf[0] = (unsigned char)(i + 1);
663 for (j = 0; j < tosend; ++j)
664 buf[1 + j] = data_block[i + j];
665 dprintk("%*ph", 5, buf);
666 ret = i2c_master_send(tx->c, buf, tosend + 1);
667 if (ret != tosend + 1) {
668 zilog_error("i2c_master_send failed with %d\n", ret);
669 return ret < 0 ? ret : -EFAULT;
676 /* send boot data to the IR TX device */
677 static int send_boot_data(struct IR_tx *tx)
680 unsigned char buf[4];
682 /* send the boot block */
683 ret = send_data_block(tx, tx_data->boot_data);
687 /* Hit the go button to activate the new boot data */
690 ret = i2c_master_send(tx->c, buf, 2);
692 zilog_error("i2c_master_send failed with %d\n", ret);
693 return ret < 0 ? ret : -EFAULT;
697 * Wait for zilog to settle after hitting go post boot block upload.
698 * Without this delay, the HD-PVR and HVR-1950 both return an -EIO
699 * upon attempting to get firmware revision, and tx probe thus fails.
701 for (i = 0; i < 10; i++) {
702 ret = i2c_master_send(tx->c, buf, 1);
709 zilog_error("i2c_master_send failed with %d\n", ret);
710 return ret < 0 ? ret : -EFAULT;
713 /* Here comes the firmware version... (hopefully) */
714 ret = i2c_master_recv(tx->c, buf, 4);
716 zilog_error("i2c_master_recv failed with %d\n", ret);
719 if ((buf[0] != 0x80) && (buf[0] != 0xa0)) {
720 zilog_error("unexpected IR TX init response: %02x\n", buf[0]);
723 zilog_notify("Zilog/Hauppauge IR blaster firmware version "
724 "%d.%d.%d loaded\n", buf[1], buf[2], buf[3]);
729 /* unload "firmware", lock held */
730 static void fw_unload_locked(void)
733 if (tx_data->code_sets)
734 vfree(tx_data->code_sets);
737 vfree(tx_data->datap);
741 dprintk("successfully unloaded IR blaster firmware\n");
745 /* unload "firmware" for the IR TX device */
746 static void fw_unload(void)
748 mutex_lock(&tx_data_lock);
750 mutex_unlock(&tx_data_lock);
753 /* load "firmware" for the IR TX device */
754 static int fw_load(struct IR_tx *tx)
758 unsigned char *data, version, num_global_fixed;
759 const struct firmware *fw_entry;
761 /* Already loaded? */
762 mutex_lock(&tx_data_lock);
768 /* Request codeset data file */
769 ret = request_firmware(&fw_entry, "haup-ir-blaster.bin", tx->ir->l.dev);
771 zilog_error("firmware haup-ir-blaster.bin not available (%d)\n",
773 ret = ret < 0 ? ret : -EFAULT;
776 dprintk("firmware of size %zu loaded\n", fw_entry->size);
779 tx_data = vmalloc(sizeof(*tx_data));
780 if (tx_data == NULL) {
781 zilog_error("out of memory\n");
782 release_firmware(fw_entry);
786 tx_data->code_sets = NULL;
788 /* Copy the data so hotplug doesn't get confused and timeout */
789 tx_data->datap = vmalloc(fw_entry->size);
790 if (tx_data->datap == NULL) {
791 zilog_error("out of memory\n");
792 release_firmware(fw_entry);
797 memcpy(tx_data->datap, fw_entry->data, fw_entry->size);
798 tx_data->endp = tx_data->datap + fw_entry->size;
799 release_firmware(fw_entry); fw_entry = NULL;
802 data = tx_data->datap;
803 if (!read_uint8(&data, tx_data->endp, &version))
806 zilog_error("unsupported code set file version (%u, expected"
807 "1) -- please upgrade to a newer driver",
814 /* Save boot block for later */
815 tx_data->boot_data = data;
816 if (!skip(&data, tx_data->endp, TX_BLOCK_SIZE))
819 if (!read_uint32(&data, tx_data->endp,
820 &tx_data->num_code_sets))
823 dprintk("%u IR blaster codesets loaded\n", tx_data->num_code_sets);
825 tx_data->code_sets = vmalloc(
826 tx_data->num_code_sets * sizeof(char *));
827 if (tx_data->code_sets == NULL) {
833 for (i = 0; i < TX_BLOCK_SIZE; ++i)
834 tx_data->fixed[i] = -1;
836 /* Read global fixed data template */
837 if (!read_uint8(&data, tx_data->endp, &num_global_fixed) ||
838 num_global_fixed > TX_BLOCK_SIZE)
840 for (i = 0; i < num_global_fixed; ++i) {
841 unsigned char pos, val;
843 if (!read_uint8(&data, tx_data->endp, &pos) ||
844 !read_uint8(&data, tx_data->endp, &val) ||
845 pos >= TX_BLOCK_SIZE)
847 tx_data->fixed[pos] = (int)val;
850 /* Filch out the position of each code set */
851 for (i = 0; i < tx_data->num_code_sets; ++i) {
854 unsigned char ndiffs;
856 /* Save the codeset position */
857 tx_data->code_sets[i] = data;
860 if (!read_uint32(&data, tx_data->endp, &id) ||
861 !read_uint8(&data, tx_data->endp, &keys) ||
862 !read_uint8(&data, tx_data->endp, &ndiffs) ||
863 ndiffs > TX_BLOCK_SIZE || keys == 0)
866 /* skip diff positions */
867 if (!skip(&data, tx_data->endp, ndiffs))
871 * After the diffs we have the first key id + data -
874 if (!skip(&data, tx_data->endp,
875 1 + TX_BLOCK_SIZE - num_global_fixed))
878 /* Then we have keys-1 blocks of key id+diffs */
879 if (!skip(&data, tx_data->endp,
880 (ndiffs + 1) * (keys - 1)))
887 zilog_error("firmware is corrupt\n");
892 mutex_unlock(&tx_data_lock);
896 /* copied from lirc_dev */
897 static ssize_t read(struct file *filep, char __user *outbuf, size_t n,
900 struct IR *ir = filep->private_data;
902 struct lirc_buffer *rbuf = ir->l.rbuf;
903 int ret = 0, written = 0, retries = 0;
905 DECLARE_WAITQUEUE(wait, current);
907 dprintk("read called\n");
908 if (n % rbuf->chunk_size) {
909 dprintk("read result = -EINVAL\n");
918 * we add ourselves to the task queue before buffer check
919 * to avoid losing scan code (in case when queue is awaken somewhere
920 * between while condition checking and scheduling)
922 add_wait_queue(&rbuf->wait_poll, &wait);
923 set_current_state(TASK_INTERRUPTIBLE);
926 * while we didn't provide 'length' bytes, device is opened in blocking
927 * mode and 'copy_to_user' is happy, wait for data.
929 while (written < n && ret == 0) {
930 if (lirc_buffer_empty(rbuf)) {
932 * According to the read(2) man page, 'written' can be
933 * returned as less than 'n', instead of blocking
934 * again, returning -EWOULDBLOCK, or returning
939 if (filep->f_flags & O_NONBLOCK) {
943 if (signal_pending(current)) {
948 set_current_state(TASK_INTERRUPTIBLE);
950 unsigned char buf[MAX_XFER_SIZE];
952 if (rbuf->chunk_size > sizeof(buf)) {
953 zilog_error("chunk_size is too big (%d)!\n",
958 m = lirc_buffer_read(rbuf, buf);
959 if (m == rbuf->chunk_size) {
960 ret = copy_to_user(outbuf + written, buf,
962 written += rbuf->chunk_size;
967 zilog_error("Buffer read failed!\n");
973 remove_wait_queue(&rbuf->wait_poll, &wait);
974 put_ir_rx(rx, false);
975 set_current_state(TASK_RUNNING);
977 dprintk("read result = %d (%s)\n", ret, ret ? "Error" : "OK");
979 return ret ? ret : written;
982 /* send a keypress to the IR TX device */
983 static int send_code(struct IR_tx *tx, unsigned int code, unsigned int key)
985 unsigned char data_block[TX_BLOCK_SIZE];
986 unsigned char buf[2];
989 /* Get data for the codeset/key */
990 ret = get_key_data(data_block, code, key);
992 if (ret == -EPROTO) {
993 zilog_error("failed to get data for code %u, key %u -- check "
994 "lircd.conf entries\n", code, key);
999 /* Send the data block */
1000 ret = send_data_block(tx, data_block);
1004 /* Send data block length? */
1007 ret = i2c_master_send(tx->c, buf, 2);
1009 zilog_error("i2c_master_send failed with %d\n", ret);
1010 return ret < 0 ? ret : -EFAULT;
1013 /* Give the z8 a moment to process data block */
1014 for (i = 0; i < 10; i++) {
1015 ret = i2c_master_send(tx->c, buf, 1);
1022 zilog_error("i2c_master_send failed with %d\n", ret);
1023 return ret < 0 ? ret : -EFAULT;
1026 /* Send finished download? */
1027 ret = i2c_master_recv(tx->c, buf, 1);
1029 zilog_error("i2c_master_recv failed with %d\n", ret);
1030 return ret < 0 ? ret : -EFAULT;
1032 if (buf[0] != 0xA0) {
1033 zilog_error("unexpected IR TX response #1: %02x\n",
1038 /* Send prepare command? */
1041 ret = i2c_master_send(tx->c, buf, 2);
1043 zilog_error("i2c_master_send failed with %d\n", ret);
1044 return ret < 0 ? ret : -EFAULT;
1048 * The sleep bits aren't necessary on the HD PVR, and in fact, the
1049 * last i2c_master_recv always fails with a -5, so for now, we're
1050 * going to skip this whole mess and say we're done on the HD PVR
1052 if (!tx->post_tx_ready_poll) {
1053 dprintk("sent code %u, key %u\n", code, key);
1058 * This bit NAKs until the device is ready, so we retry it
1059 * sleeping a bit each time. This seems to be what the windows
1060 * driver does, approximately.
1063 for (i = 0; i < 20; ++i) {
1064 set_current_state(TASK_UNINTERRUPTIBLE);
1065 schedule_timeout((50 * HZ + 999) / 1000);
1066 ret = i2c_master_send(tx->c, buf, 1);
1069 dprintk("NAK expected: i2c_master_send "
1070 "failed with %d (try %d)\n", ret, i+1);
1073 zilog_error("IR TX chip never got ready: last i2c_master_send "
1074 "failed with %d\n", ret);
1075 return ret < 0 ? ret : -EFAULT;
1078 /* Seems to be an 'ok' response */
1079 i = i2c_master_recv(tx->c, buf, 1);
1081 zilog_error("i2c_master_recv failed with %d\n", ret);
1084 if (buf[0] != 0x80) {
1085 zilog_error("unexpected IR TX response #2: %02x\n", buf[0]);
1089 /* Oh good, it worked */
1090 dprintk("sent code %u, key %u\n", code, key);
1095 * Write a code to the device. We take in a 32-bit number (an int) and then
1096 * decode this to a codeset/key index. The key data is then decompressed and
1097 * sent to the device. We have a spin lock as per i2c documentation to prevent
1098 * multiple concurrent sends which would probably cause the device to explode.
1100 static ssize_t write(struct file *filep, const char __user *buf, size_t n,
1103 struct IR *ir = filep->private_data;
1108 /* Validate user parameters */
1109 if (n % sizeof(int))
1112 /* Get a struct IR_tx reference */
1117 /* Ensure our tx->c i2c_client remains valid for the duration */
1118 mutex_lock(&tx->client_lock);
1119 if (tx->c == NULL) {
1120 mutex_unlock(&tx->client_lock);
1121 put_ir_tx(tx, false);
1125 /* Lock i2c bus for the duration */
1126 mutex_lock(&ir->ir_lock);
1128 /* Send each keypress */
1129 for (i = 0; i < n;) {
1133 if (copy_from_user(&command, buf + i, sizeof(command))) {
1134 mutex_unlock(&ir->ir_lock);
1135 mutex_unlock(&tx->client_lock);
1136 put_ir_tx(tx, false);
1140 /* Send boot data first if required */
1141 if (tx->need_boot == 1) {
1142 /* Make sure we have the 'firmware' loaded, first */
1145 mutex_unlock(&ir->ir_lock);
1146 mutex_unlock(&tx->client_lock);
1147 put_ir_tx(tx, false);
1152 /* Prep the chip for transmitting codes */
1153 ret = send_boot_data(tx);
1160 ret = send_code(tx, (unsigned)command >> 16,
1161 (unsigned)command & 0xFFFF);
1162 if (ret == -EPROTO) {
1163 mutex_unlock(&ir->ir_lock);
1164 mutex_unlock(&tx->client_lock);
1165 put_ir_tx(tx, false);
1171 * Hmm, a failure. If we've had a few then give up, otherwise
1175 /* Looks like the chip crashed, reset it */
1176 zilog_error("sending to the IR transmitter chip "
1177 "failed, trying reset\n");
1179 if (failures >= 3) {
1180 zilog_error("unable to send to the IR chip "
1181 "after 3 resets, giving up\n");
1182 mutex_unlock(&ir->ir_lock);
1183 mutex_unlock(&tx->client_lock);
1184 put_ir_tx(tx, false);
1187 set_current_state(TASK_UNINTERRUPTIBLE);
1188 schedule_timeout((100 * HZ + 999) / 1000);
1195 /* Release i2c bus */
1196 mutex_unlock(&ir->ir_lock);
1198 mutex_unlock(&tx->client_lock);
1200 /* Give back our struct IR_tx reference */
1201 put_ir_tx(tx, false);
1203 /* All looks good */
1207 /* copied from lirc_dev */
1208 static unsigned int poll(struct file *filep, poll_table *wait)
1210 struct IR *ir = filep->private_data;
1212 struct lirc_buffer *rbuf = ir->l.rbuf;
1215 dprintk("poll called\n");
1220 * Revisit this, if our poll function ever reports writeable
1223 dprintk("poll result = POLLERR\n");
1228 * Add our lirc_buffer's wait_queue to the poll_table. A wake up on
1229 * that buffer's wait queue indicates we may have a new poll status.
1231 poll_wait(filep, &rbuf->wait_poll, wait);
1233 /* Indicate what ops could happen immediately without blocking */
1234 ret = lirc_buffer_empty(rbuf) ? 0 : (POLLIN|POLLRDNORM);
1236 dprintk("poll result = %s\n", ret ? "POLLIN|POLLRDNORM" : "none");
1240 static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
1242 struct IR *ir = filep->private_data;
1243 unsigned long __user *uptr = (unsigned long __user *)arg;
1245 unsigned long mode, features;
1247 features = ir->l.features;
1250 case LIRC_GET_LENGTH:
1251 result = put_user(13UL, uptr);
1253 case LIRC_GET_FEATURES:
1254 result = put_user(features, uptr);
1256 case LIRC_GET_REC_MODE:
1257 if (!(features&LIRC_CAN_REC_MASK))
1260 result = put_user(LIRC_REC2MODE
1261 (features&LIRC_CAN_REC_MASK),
1264 case LIRC_SET_REC_MODE:
1265 if (!(features&LIRC_CAN_REC_MASK))
1268 result = get_user(mode, uptr);
1269 if (!result && !(LIRC_MODE2REC(mode) & features))
1272 case LIRC_GET_SEND_MODE:
1273 if (!(features&LIRC_CAN_SEND_MASK))
1276 result = put_user(LIRC_MODE_PULSE, uptr);
1278 case LIRC_SET_SEND_MODE:
1279 if (!(features&LIRC_CAN_SEND_MASK))
1282 result = get_user(mode, uptr);
1283 if (!result && mode != LIRC_MODE_PULSE)
1292 static struct IR *get_ir_device_by_minor(unsigned int minor)
1295 struct IR *ret = NULL;
1297 mutex_lock(&ir_devices_lock);
1299 if (!list_empty(&ir_devices_list)) {
1300 list_for_each_entry(ir, &ir_devices_list, list) {
1301 if (ir->l.minor == minor) {
1302 ret = get_ir_device(ir, true);
1308 mutex_unlock(&ir_devices_lock);
1313 * Open the IR device. Get hold of our IR structure and
1314 * stash it in private_data for the file
1316 static int open(struct inode *node, struct file *filep)
1319 unsigned int minor = MINOR(node->i_rdev);
1321 /* find our IR struct */
1322 ir = get_ir_device_by_minor(minor);
1327 atomic_inc(&ir->open_count);
1329 /* stash our IR struct */
1330 filep->private_data = ir;
1332 nonseekable_open(node, filep);
1336 /* Close the IR device */
1337 static int close(struct inode *node, struct file *filep)
1339 /* find our IR struct */
1340 struct IR *ir = filep->private_data;
1343 zilog_error("close: no private_data attached to the file!\n");
1347 atomic_dec(&ir->open_count);
1349 put_ir_device(ir, false);
1353 static int ir_remove(struct i2c_client *client);
1354 static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id);
1356 #define ID_FLAG_TX 0x01
1357 #define ID_FLAG_HDPVR 0x02
1359 static const struct i2c_device_id ir_transceiver_id[] = {
1360 { "ir_tx_z8f0811_haup", ID_FLAG_TX },
1361 { "ir_rx_z8f0811_haup", 0 },
1362 { "ir_tx_z8f0811_hdpvr", ID_FLAG_HDPVR | ID_FLAG_TX },
1363 { "ir_rx_z8f0811_hdpvr", ID_FLAG_HDPVR },
1367 static struct i2c_driver driver = {
1369 .owner = THIS_MODULE,
1370 .name = "Zilog/Hauppauge i2c IR",
1373 .remove = ir_remove,
1374 .id_table = ir_transceiver_id,
1377 static const struct file_operations lirc_fops = {
1378 .owner = THIS_MODULE,
1379 .llseek = no_llseek,
1383 .unlocked_ioctl = ioctl,
1384 #ifdef CONFIG_COMPAT
1385 .compat_ioctl = ioctl,
1391 static struct lirc_driver lirc_template = {
1392 .name = "lirc_zilog",
1395 .buffer_size = BUFLEN / 2,
1396 .sample_rate = 0, /* tell lirc_dev to not start its own kthread */
1398 .set_use_inc = set_use_inc,
1399 .set_use_dec = set_use_dec,
1401 .owner = THIS_MODULE,
1404 static int ir_remove(struct i2c_client *client)
1406 if (strncmp("ir_tx_z8", client->name, 8) == 0) {
1407 struct IR_tx *tx = i2c_get_clientdata(client);
1410 mutex_lock(&tx->client_lock);
1412 mutex_unlock(&tx->client_lock);
1413 put_ir_tx(tx, false);
1415 } else if (strncmp("ir_rx_z8", client->name, 8) == 0) {
1416 struct IR_rx *rx = i2c_get_clientdata(client);
1419 mutex_lock(&rx->client_lock);
1421 mutex_unlock(&rx->client_lock);
1422 put_ir_rx(rx, false);
1429 /* ir_devices_lock must be held */
1430 static struct IR *get_ir_device_by_adapter(struct i2c_adapter *adapter)
1434 if (list_empty(&ir_devices_list))
1437 list_for_each_entry(ir, &ir_devices_list, list)
1438 if (ir->adapter == adapter) {
1439 get_ir_device(ir, true);
1446 static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
1451 struct i2c_adapter *adap = client->adapter;
1453 bool tx_probe = false;
1455 dprintk("%s: %s on i2c-%d (%s), client addr=0x%02x\n",
1456 __func__, id->name, adap->nr, adap->name, client->addr);
1459 * The IR receiver is at i2c address 0x71.
1460 * The IR transmitter is at i2c address 0x70.
1463 if (id->driver_data & ID_FLAG_TX)
1465 else if (tx_only) /* module option */
1468 zilog_info("probing IR %s on %s (i2c-%d)\n",
1469 tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
1471 mutex_lock(&ir_devices_lock);
1473 /* Use a single struct IR instance for both the Rx and Tx functions */
1474 ir = get_ir_device_by_adapter(adap);
1476 ir = kzalloc(sizeof(struct IR), GFP_KERNEL);
1481 kref_init(&ir->ref);
1483 /* store for use in ir_probe() again, and open() later on */
1484 INIT_LIST_HEAD(&ir->list);
1485 list_add_tail(&ir->list, &ir_devices_list);
1488 mutex_init(&ir->ir_lock);
1489 atomic_set(&ir->open_count, 0);
1490 spin_lock_init(&ir->tx_ref_lock);
1491 spin_lock_init(&ir->rx_ref_lock);
1493 /* set lirc_dev stuff */
1494 memcpy(&ir->l, &lirc_template, sizeof(struct lirc_driver));
1496 * FIXME this is a pointer reference to us, but no refcount.
1498 * This OK for now, since lirc_dev currently won't touch this
1499 * buffer as we provide our own lirc_fops.
1501 * Currently our own lirc_fops rely on this ir->l.rbuf pointer
1503 ir->l.rbuf = &ir->rbuf;
1504 ir->l.dev = &adap->dev;
1505 ret = lirc_buffer_init(ir->l.rbuf,
1506 ir->l.chunk_size, ir->l.buffer_size);
1512 /* Get the IR_rx instance for later, if already allocated */
1515 /* Set up a struct IR_tx instance */
1516 tx = kzalloc(sizeof(struct IR_tx), GFP_KERNEL);
1521 kref_init(&tx->ref);
1524 ir->l.features |= LIRC_CAN_SEND_PULSE;
1525 mutex_init(&tx->client_lock);
1528 tx->post_tx_ready_poll =
1529 (id->driver_data & ID_FLAG_HDPVR) ? false : true;
1531 /* An ir ref goes to the struct IR_tx instance */
1532 tx->ir = get_ir_device(ir, true);
1534 /* A tx ref goes to the i2c_client */
1535 i2c_set_clientdata(client, get_ir_tx(ir));
1538 * Load the 'firmware'. We do this before registering with
1539 * lirc_dev, so the first firmware load attempt does not happen
1540 * after a open() or write() call on the device.
1542 * Failure here is not deemed catastrophic, so the receiver will
1543 * still be usable. Firmware load will be retried in write(),
1548 /* Proceed only if the Rx client is also ready or not needed */
1549 if (rx == NULL && !tx_only) {
1550 zilog_info("probe of IR Tx on %s (i2c-%d) done. Waiting"
1551 " on IR Rx.\n", adap->name, adap->nr);
1555 /* Get the IR_tx instance for later, if already allocated */
1558 /* Set up a struct IR_rx instance */
1559 rx = kzalloc(sizeof(struct IR_rx), GFP_KERNEL);
1564 kref_init(&rx->ref);
1567 ir->l.features |= LIRC_CAN_REC_LIRCCODE;
1568 mutex_init(&rx->client_lock);
1570 rx->hdpvr_data_fmt =
1571 (id->driver_data & ID_FLAG_HDPVR) ? true : false;
1573 /* An ir ref goes to the struct IR_rx instance */
1574 rx->ir = get_ir_device(ir, true);
1576 /* An rx ref goes to the i2c_client */
1577 i2c_set_clientdata(client, get_ir_rx(ir));
1580 * Start the polling thread.
1581 * It will only perform an empty loop around schedule_timeout()
1582 * until we register with lirc_dev and the first user open()
1584 /* An ir ref goes to the new rx polling kthread */
1585 rx->task = kthread_run(lirc_thread, get_ir_device(ir, true),
1586 "zilog-rx-i2c-%d", adap->nr);
1587 if (IS_ERR(rx->task)) {
1588 ret = PTR_ERR(rx->task);
1589 zilog_error("%s: could not start IR Rx polling thread"
1591 /* Failed kthread, so put back the ir ref */
1592 put_ir_device(ir, true);
1593 /* Failure exit, so put back rx ref from i2c_client */
1594 i2c_set_clientdata(client, NULL);
1595 put_ir_rx(rx, true);
1596 ir->l.features &= ~LIRC_CAN_REC_LIRCCODE;
1600 /* Proceed only if the Tx client is also ready */
1602 zilog_info("probe of IR Rx on %s (i2c-%d) done. Waiting"
1603 " on IR Tx.\n", adap->name, adap->nr);
1608 /* register with lirc */
1609 ir->l.minor = minor; /* module option: user requested minor number */
1610 ir->l.minor = lirc_register_driver(&ir->l);
1611 if (ir->l.minor < 0 || ir->l.minor >= MAX_IRCTL_DEVICES) {
1612 zilog_error("%s: \"minor\" must be between 0 and %d (%d)!\n",
1613 __func__, MAX_IRCTL_DEVICES-1, ir->l.minor);
1617 zilog_info("IR unit on %s (i2c-%d) registered as lirc%d and ready\n",
1618 adap->name, adap->nr, ir->l.minor);
1622 put_ir_rx(rx, true);
1624 put_ir_tx(tx, true);
1625 put_ir_device(ir, true);
1626 zilog_info("probe of IR %s on %s (i2c-%d) done\n",
1627 tx_probe ? "Tx" : "Rx", adap->name, adap->nr);
1628 mutex_unlock(&ir_devices_lock);
1633 put_ir_rx(rx, true);
1635 put_ir_tx(tx, true);
1637 put_ir_device(ir, true);
1639 zilog_error("%s: probing IR %s on %s (i2c-%d) failed with %d\n",
1640 __func__, tx_probe ? "Tx" : "Rx", adap->name, adap->nr,
1642 mutex_unlock(&ir_devices_lock);
1646 static int __init zilog_init(void)
1650 zilog_notify("Zilog/Hauppauge IR driver initializing\n");
1652 mutex_init(&tx_data_lock);
1654 request_module("firmware_class");
1656 ret = i2c_add_driver(&driver);
1658 zilog_error("initialization failed\n");
1660 zilog_notify("initialization complete\n");
1665 static void __exit zilog_exit(void)
1667 i2c_del_driver(&driver);
1670 zilog_notify("Zilog/Hauppauge IR driver unloaded\n");
1673 module_init(zilog_init);
1674 module_exit(zilog_exit);
1676 MODULE_DESCRIPTION("Zilog/Hauppauge infrared transmitter driver (i2c stack)");
1677 MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, "
1678 "Ulrich Mueller, Stefan Jahn, Jerome Brock, Mark Weaver, "
1680 MODULE_LICENSE("GPL");
1681 /* for compat with old name, which isn't all that accurate anymore */
1682 MODULE_ALIAS("lirc_pvr150");
1684 module_param(minor, int, 0444);
1685 MODULE_PARM_DESC(minor, "Preferred minor device number");
1687 module_param(debug, bool, 0644);
1688 MODULE_PARM_DESC(debug, "Enable debugging messages");
1690 module_param(tx_only, bool, 0644);
1691 MODULE_PARM_DESC(tx_only, "Only handle the IR transmit function");