// SPDX-License-Identifier: GPL-2.0-or-later /* * * keyboard input driver for i2c IR remote controls * * Copyright (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org> * modified for PixelView (BT878P+W/FM) by * Michal Kochanowicz <mkochano@pld.org.pl> * Christoph Bartelmus <lirc@bartelmus.de> * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by * Ulrich Mueller <ulrich.mueller42@web.de> * modified for em2820 based USB TV tuners by * Markus Rechberger <mrechberger@gmail.com> * modified for DViCO Fusion HDTV 5 RT GOLD by * Chaogui Zhang <czhang1974@gmail.com> * modified for MSI TV@nywhere Plus by * Henry Wong <henry@stuffedcow.net> * Mark Schultz <n9xmj@yahoo.com> * 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>
*/
/* rc5 has two start bits * the first bit must be one * the second bit defines the command range: * 1 = 0-63, 0 = 64 - 127
*/ if (!start) /* no key pressed */ return 0;
/* * This is the same apparent "are you ready?" poll command observed * watching Windows driver traffic and implemented in lirc_zilog. With * this added, we get far saner remote behavior with z8 chips on usb * connected devices, even with the default polling interval of 100ms.
*/
ret = i2c_master_send(ir->c, buf, 1); if (ret != 1) return (ret < 0) ? ret : -EINVAL;
/* poll IR chip */
rc = i2c_master_recv(ir->c, &b, 1); if (rc != 1) {
dev_dbg(&ir->rc->dev, "read error\n"); if (rc < 0) return rc; return -EIO;
}
/* it seems that 0xFE indicates that a button is still hold down, while 0xff indicates that no button is hold
down. 0xfe sequences are sometimes interrupted by 0xFF */
/* * 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;
}
}
/* * 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;
staticint 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;
}
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.
*/ staticvoid copy_codes(u8 *dst, u8 *src, unsignedint 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.
*/ staticint cmp_no_trail(u8 *a, u8 *b, unsignedint count)
{ while (--count) { if (*a++ != *b++) return 1;
}
return (*a & 0xf0) - (*b & 0xf0);
}
staticint find_slot(u16 *array, unsignedint size, u16 val)
{ int i;
for (i = 0; i < size; i++) { if (get_unaligned_be16(&array[i]) == val) { return i;
} elseif (!array[i]) {
put_unaligned_be16(val, &array[i]); return i;
}
}
return -1;
}
staticint zilog_ir_format(struct rc_dev *rcdev, unsignedint *txbuf, unsignedint 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];
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;
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;
}
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);
ret = -EIO; goto out_unlock;
} elseif (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);
if ((id->driver_data & FLAG_HDPVR) && !enable_hdpvr) {
dev_err(&client->dev, "IR for HDPVR is known to cause problems during recording, use enable_hdpvr modparam to enable\n"); return -ENODEV;
}
ir = devm_kzalloc(&client->dev, sizeof(*ir), GFP_KERNEL); if (!ir) return -ENOMEM;
name = init_data->name; if (init_data->type)
rc_proto = init_data->type;
if (init_data->polling_interval)
ir->polling_interval = init_data->polling_interval;
switch (init_data->internal_get_key_func) { case IR_KBD_GET_KEY_CUSTOM: /* The bridge driver provided us its own function */
ir->get_key = init_data->get_key; break; case IR_KBD_GET_KEY_PIXELVIEW:
ir->get_key = get_key_pixelview; break; case IR_KBD_GET_KEY_HAUP:
ir->get_key = get_key_haup; break; case IR_KBD_GET_KEY_KNC1:
ir->get_key = get_key_knc1; break; case IR_KBD_GET_KEY_GENIATECH:
ir->get_key = get_key_geniatech; break; case IR_KBD_GET_KEY_FUSIONHDTV:
ir->get_key = get_key_fusionhdtv; break; case IR_KBD_GET_KEY_HAUP_XVR:
ir->get_key = get_key_haup_xvr; break; case IR_KBD_GET_KEY_AVERMEDIA_CARDBUS:
ir->get_key = get_key_avermedia_cardbus; break;
}
}
if (!rc) { /* * If platform_data doesn't specify rc_dev, initialize it * internally
*/
rc = rc_allocate_device(RC_DRIVER_SCANCODE); if (!rc) return -ENOMEM;
}
ir->rc = rc;
/* Make sure we are all setup before going on */ if (!name || !ir->get_key || !rc_proto || !ir_codes) {
dev_warn(&client->dev, "Unsupported device at address 0x%02x\n",
addr);
err = -ENODEV; goto err_out_free;
}
/* * Initialize input_dev fields * It doesn't make sense to allow overriding them via platform_data
*/
rc->input_id.bustype = BUS_I2C;
rc->input_phys = ir->phys;
rc->device_name = name;
rc->dev.parent = &client->dev;
rc->priv = ir;
rc->open = ir_open;
rc->close = ir_close;
/* * Initialize the other fields of rc_dev
*/
rc->map_name = ir->ir_codes;
rc->allowed_protocols = rc_proto; if (!rc->driver_name)
rc->driver_name = KBUILD_MODNAME;
MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
MODULE_DESCRIPTION("input driver for i2c IR remote controls");
MODULE_LICENSE("GPL");
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