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-rw-r--r--drivers/media/i2c/ir-kbd-i2c.c436
-rw-r--r--include/media/i2c/ir-kbd-i2c.h5
2 files changed, 433 insertions, 8 deletions
diff --git a/drivers/media/i2c/ir-kbd-i2c.c b/drivers/media/i2c/ir-kbd-i2c.c
index ec669ec4cfc5..020ef0d7058e 100644
--- a/drivers/media/i2c/ir-kbd-i2c.c
+++ b/drivers/media/i2c/ir-kbd-i2c.c
@@ -18,6 +18,20 @@
* Brian Rogers <brian_rogers@comcast.net>
* modified for AVerMedia Cardbus by
* Oldrich Jedlicka <oldium.pro@seznam.cz>
+ * Zilog Transmitter portions/ideas were derived from GPLv2+ sources:
+ * - drivers/char/pctv_zilogir.[ch] from Hauppauge Broadway product
+ * Copyright 2011 Hauppauge Computer works
+ * - drivers/staging/media/lirc/lirc_zilog.c
+ * Copyright (c) 2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ * Michal Kochanowicz <mkochano@pld.org.pl>
+ * Christoph Bartelmus <lirc@bartelmus.de>
+ * Ulrich Mueller <ulrich.mueller42@web.de>
+ * Stefan Jahn <stefan@lkcc.org>
+ * Jerome Brock <jbrock@users.sourceforge.net>
+ * Thomas Reitmayr (treitmayr@yahoo.com)
+ * Mark Weaver <mark@npsl.co.uk>
+ * Jarod Wilson <jarod@redhat.com>
+ * Copyright (C) 2011 Andy Walls <awalls@md.metrocast.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -46,6 +60,8 @@
#include <media/rc-core.h>
#include <media/i2c/ir-kbd-i2c.h>
+#define FLAG_TX 1
+#define FLAG_HDPVR 2
static int get_key_haup_common(struct IR_i2c *ir, enum rc_proto *protocol,
u32 *scancode, u8 *ptoggle, int size)
@@ -288,11 +304,18 @@ static void ir_work(struct work_struct *work)
int rc;
struct IR_i2c *ir = container_of(work, struct IR_i2c, work.work);
- rc = ir_key_poll(ir);
- if (rc == -ENODEV) {
- rc_unregister_device(ir->rc);
- ir->rc = NULL;
- return;
+ /*
+ * If the transmit code is holding the lock, skip polling for
+ * IR, we'll get it to it next time round
+ */
+ if (mutex_trylock(&ir->lock)) {
+ rc = ir_key_poll(ir);
+ mutex_unlock(&ir->lock);
+ if (rc == -ENODEV) {
+ rc_unregister_device(ir->rc);
+ ir->rc = NULL;
+ return;
+ }
}
schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling_interval));
@@ -314,7 +337,383 @@ static void ir_close(struct rc_dev *dev)
cancel_delayed_work_sync(&ir->work);
}
-/* ----------------------------------------------------------------------- */
+/* Zilog Transmit Interface */
+#define XTAL_FREQ 18432000
+
+#define ZILOG_SEND 0x80
+#define ZILOG_UIR_END 0x40
+#define ZILOG_INIT_END 0x20
+#define ZILOG_LIR_END 0x10
+
+#define ZILOG_STATUS_OK 0x80
+#define ZILOG_STATUS_TX 0x40
+#define ZILOG_STATUS_SET 0x20
+
+/*
+ * As you can see here, very few different lengths of pulse and space
+ * can be encoded. This means that the hardware does not work well with
+ * recorded IR. It's best to work with generated IR, like from ir-ctl or
+ * the in-kernel encoders.
+ */
+struct code_block {
+ u8 length;
+ u16 pulse[7]; /* not aligned */
+ u8 carrier_pulse;
+ u8 carrier_space;
+ u16 space[8]; /* not aligned */
+ u8 codes[61];
+ u8 csum[2];
+} __packed;
+
+static int send_data_block(struct IR_i2c *ir, int cmd,
+ struct code_block *code_block)
+{
+ int i, j, ret;
+ u8 buf[5], *p;
+
+ p = &code_block->length;
+ for (i = 0; p < code_block->csum; i++)
+ code_block->csum[i & 1] ^= *p++;
+
+ p = &code_block->length;
+
+ for (i = 0; i < sizeof(*code_block);) {
+ int tosend = sizeof(*code_block) - i;
+
+ if (tosend > 4)
+ tosend = 4;
+ buf[0] = i + 1;
+ for (j = 0; j < tosend; ++j)
+ buf[1 + j] = p[i + j];
+ dev_dbg(&ir->rc->dev, "%*ph", tosend + 1, buf);
+ ret = i2c_master_send(ir->tx_c, buf, tosend + 1);
+ if (ret != tosend + 1) {
+ dev_dbg(&ir->rc->dev,
+ "i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EIO;
+ }
+ i += tosend;
+ }
+
+ buf[0] = 0;
+ buf[1] = cmd;
+ ret = i2c_master_send(ir->tx_c, buf, 2);
+ if (ret != 2) {
+ dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ usleep_range(2000, 5000);
+
+ ret = i2c_master_send(ir->tx_c, buf, 1);
+ if (ret != 1) {
+ dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ return 0;
+}
+
+static int zilog_init(struct IR_i2c *ir)
+{
+ struct code_block code_block = { .length = sizeof(code_block) };
+ u8 buf[4];
+ int ret;
+
+ put_unaligned_be16(0x1000, &code_block.pulse[3]);
+
+ ret = send_data_block(ir, ZILOG_INIT_END, &code_block);
+ if (ret)
+ return ret;
+
+ ret = i2c_master_recv(ir->tx_c, buf, 4);
+ if (ret != 4) {
+ dev_err(&ir->c->dev, "failed to retrieve firmware version: %d\n",
+ ret);
+ return ret < 0 ? ret : -EIO;
+ }
+
+ dev_info(&ir->c->dev, "Zilog/Hauppauge IR blaster firmware version %d.%d.%d\n",
+ buf[1], buf[2], buf[3]);
+
+ return 0;
+}
+
+/*
+ * If the last slot for pulse is the same as the current slot for pulse,
+ * then use slot no 7.
+ */
+static void copy_codes(u8 *dst, u8 *src, unsigned int count)
+{
+ u8 c, last = 0xff;
+
+ while (count--) {
+ c = *src++;
+ if ((c & 0xf0) == last) {
+ *dst++ = 0x70 | (c & 0xf);
+ } else {
+ *dst++ = c;
+ last = c & 0xf0;
+ }
+ }
+}
+
+/*
+ * When looking for repeats, we don't care about the trailing space. This
+ * is set to the shortest possible anyway.
+ */
+static int cmp_no_trail(u8 *a, u8 *b, unsigned int count)
+{
+ while (--count) {
+ if (*a++ != *b++)
+ return 1;
+ }
+
+ return (*a & 0xf0) - (*b & 0xf0);
+}
+
+static int find_slot(u16 *array, unsigned int size, u16 val)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (get_unaligned_be16(&array[i]) == val) {
+ return i;
+ } else if (!array[i]) {
+ put_unaligned_be16(val, &array[i]);
+ return i;
+ }
+ }
+
+ return -1;
+}
+
+static int zilog_ir_format(struct rc_dev *rcdev, unsigned int *txbuf,
+ unsigned int count, struct code_block *code_block)
+{
+ struct IR_i2c *ir = rcdev->priv;
+ int rep, i, l, p = 0, s, c = 0;
+ bool repeating;
+ u8 codes[174];
+
+ code_block->carrier_pulse = DIV_ROUND_CLOSEST(
+ ir->duty_cycle * XTAL_FREQ / 1000, ir->carrier);
+ code_block->carrier_space = DIV_ROUND_CLOSEST(
+ (100 - ir->duty_cycle) * XTAL_FREQ / 1000, ir->carrier);
+
+ for (i = 0; i < count; i++) {
+ if (c >= ARRAY_SIZE(codes) - 1) {
+ dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Lengths more than 142220us cannot be encoded; also
+ * this checks for multiply overflow
+ */
+ if (txbuf[i] > 142220)
+ return -EINVAL;
+
+ l = DIV_ROUND_CLOSEST((XTAL_FREQ / 1000) * txbuf[i], 40000);
+
+ if (i & 1) {
+ s = find_slot(code_block->space,
+ ARRAY_SIZE(code_block->space), l);
+ if (s == -1) {
+ dev_warn(&rcdev->dev, "Too many different lengths spaces, cannot transmit");
+ return -EINVAL;
+ }
+
+ /* We have a pulse and space */
+ codes[c++] = (p << 4) | s;
+ } else {
+ p = find_slot(code_block->pulse,
+ ARRAY_SIZE(code_block->pulse), l);
+ if (p == -1) {
+ dev_warn(&rcdev->dev, "Too many different lengths pulses, cannot transmit");
+ return -EINVAL;
+ }
+ }
+ }
+
+ /* We have to encode the trailing pulse. Find the shortest space */
+ s = 0;
+ for (i = 1; i < ARRAY_SIZE(code_block->space); i++) {
+ u16 d = get_unaligned_be16(&code_block->space[i]);
+
+ if (get_unaligned_be16(&code_block->space[s]) > d)
+ s = i;
+ }
+
+ codes[c++] = (p << 4) | s;
+
+ dev_dbg(&rcdev->dev, "generated %d codes\n", c);
+
+ /*
+ * Are the last N codes (so pulse + space) repeating 3 times?
+ * if so we can shorten the codes list and use code 0xc0 to repeat
+ * them.
+ */
+ repeating = false;
+
+ for (rep = c / 3; rep >= 1; rep--) {
+ if (!memcmp(&codes[c - rep * 3], &codes[c - rep * 2], rep) &&
+ !cmp_no_trail(&codes[c - rep], &codes[c - rep * 2], rep)) {
+ repeating = true;
+ break;
+ }
+ }
+
+ if (repeating) {
+ /* first copy any leading non-repeating */
+ int leading = c - rep * 3;
+
+ if (leading + rep >= ARRAY_SIZE(code_block->codes) - 3) {
+ dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(&rcdev->dev, "found trailing %d repeat\n", rep);
+ copy_codes(code_block->codes, codes, leading);
+ code_block->codes[leading] = 0x82;
+ copy_codes(code_block->codes + leading + 1, codes + leading,
+ rep);
+ c = leading + 1 + rep;
+ code_block->codes[c++] = 0xc0;
+ } else {
+ if (c >= ARRAY_SIZE(code_block->codes) - 3) {
+ dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(&rcdev->dev, "found no trailing repeat\n");
+ code_block->codes[0] = 0x82;
+ copy_codes(code_block->codes + 1, codes, c);
+ c++;
+ code_block->codes[c++] = 0xc4;
+ }
+
+ while (c < ARRAY_SIZE(code_block->codes))
+ code_block->codes[c++] = 0x83;
+
+ return 0;
+}
+
+static int zilog_tx(struct rc_dev *rcdev, unsigned int *txbuf,
+ unsigned int count)
+{
+ struct IR_i2c *ir = rcdev->priv;
+ struct code_block code_block = { .length = sizeof(code_block) };
+ u8 buf[2];
+ int ret, i;
+
+ ret = zilog_ir_format(rcdev, txbuf, count, &code_block);
+ if (ret)
+ return ret;
+
+ ret = mutex_lock_interruptible(&ir->lock);
+ if (ret)
+ return ret;
+
+ ret = send_data_block(ir, ZILOG_UIR_END, &code_block);
+ if (ret)
+ goto out_unlock;
+
+ ret = i2c_master_recv(ir->tx_c, buf, 1);
+ if (ret != 1) {
+ dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
+ goto out_unlock;
+ }
+
+ dev_dbg(&ir->rc->dev, "code set status: %02x\n", buf[0]);
+
+ if (buf[0] != (ZILOG_STATUS_OK | ZILOG_STATUS_SET)) {
+ dev_err(&ir->rc->dev, "unexpected IR TX response %02x\n",
+ buf[0]);
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ buf[0] = 0x00;
+ buf[1] = ZILOG_SEND;
+
+ ret = i2c_master_send(ir->tx_c, buf, 2);
+ if (ret != 2) {
+ dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
+ if (ret >= 0)
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ dev_dbg(&ir->rc->dev, "send command sent\n");
+
+ /*
+ * This bit NAKs until the device is ready, so we retry it
+ * sleeping a bit each time. This seems to be what the windows
+ * driver does, approximately.
+ * Try for up to 1s.
+ */
+ for (i = 0; i < 20; ++i) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(50));
+ ret = i2c_master_send(ir->tx_c, buf, 1);
+ if (ret == 1)
+ break;
+ dev_dbg(&ir->rc->dev,
+ "NAK expected: i2c_master_send failed with %d (try %d)\n",
+ ret, i + 1);
+ }
+
+ if (ret != 1) {
+ dev_err(&ir->rc->dev,
+ "IR TX chip never got ready: last i2c_master_send failed with %d\n",
+ ret);
+ if (ret >= 0)
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ i = i2c_master_recv(ir->tx_c, buf, 1);
+ if (i != 1) {
+ dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
+ ret = -EIO;
+ goto out_unlock;
+ } else if (buf[0] != ZILOG_STATUS_OK) {
+ dev_err(&ir->rc->dev, "unexpected IR TX response #2: %02x\n",
+ buf[0]);
+ ret = -EIO;
+ goto out_unlock;
+ }
+ dev_dbg(&ir->rc->dev, "transmit complete\n");
+
+ /* Oh good, it worked */
+ ret = count;
+out_unlock:
+ mutex_unlock(&ir->lock);
+
+ return ret;
+}
+
+static int zilog_tx_carrier(struct rc_dev *dev, u32 carrier)
+{
+ struct IR_i2c *ir = dev->priv;
+
+ if (carrier > 500000 || carrier < 20000)
+ return -EINVAL;
+
+ ir->carrier = carrier;
+
+ return 0;
+}
+
+static int zilog_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
+{
+ struct IR_i2c *ir = dev->priv;
+
+ ir->duty_cycle = duty_cycle;
+
+ return 0;
+}
static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
@@ -469,8 +868,23 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (!rc->driver_name)
rc->driver_name = KBUILD_MODNAME;
+ mutex_init(&ir->lock);
+
INIT_DELAYED_WORK(&ir->work, ir_work);
+ if (id->driver_data & FLAG_TX) {
+ ir->tx_c = i2c_new_dummy(client->adapter, 0x70);
+ if (!ir->tx_c) {
+ dev_err(&client->dev, "failed to setup tx i2c address");
+ } else if (!zilog_init(ir)) {
+ ir->carrier = 38000;
+ ir->duty_cycle = 40;
+ rc->tx_ir = zilog_tx;
+ rc->s_tx_carrier = zilog_tx_carrier;
+ rc->s_tx_duty_cycle = zilog_tx_duty_cycle;
+ }
+ }
+
err = rc_register_device(rc);
if (err)
goto err_out_free;
@@ -478,6 +892,9 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
return 0;
err_out_free:
+ if (ir->tx_c)
+ i2c_unregister_device(ir->tx_c);
+
/* Only frees rc if it were allocated internally */
rc_free_device(rc);
return err;
@@ -490,6 +907,9 @@ static int ir_remove(struct i2c_client *client)
/* kill outstanding polls */
cancel_delayed_work_sync(&ir->work);
+ if (ir->tx_c)
+ i2c_unregister_device(ir->tx_c);
+
/* unregister device */
rc_unregister_device(ir->rc);
@@ -501,8 +921,8 @@ static const struct i2c_device_id ir_kbd_id[] = {
/* Generic entry for any IR receiver */
{ "ir_video", 0 },
/* IR device specific entries should be added here */
- { "ir_z8f0811_haup", 0 },
- { "ir_z8f0811_hdpvr", 0 },
+ { "ir_z8f0811_haup", FLAG_TX },
+ { "ir_z8f0811_hdpvr", FLAG_TX | FLAG_HDPVR },
{ }
};
diff --git a/include/media/i2c/ir-kbd-i2c.h b/include/media/i2c/ir-kbd-i2c.h
index 1a9df1ae533f..9f47d6a48cff 100644
--- a/include/media/i2c/ir-kbd-i2c.h
+++ b/include/media/i2c/ir-kbd-i2c.h
@@ -23,6 +23,11 @@ struct IR_i2c {
int (*get_key)(struct IR_i2c *ir,
enum rc_proto *protocol,
u32 *scancode, u8 *toggle);
+ /* tx */
+ struct i2c_client *tx_c;
+ struct mutex lock; /* do not poll Rx during Tx */
+ unsigned int carrier;
+ unsigned int duty_cycle;
};
enum ir_kbd_get_key_fn {
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-20 12:31:43 +0000