[media] rc: Add support for the TechnoTrend USB IR Receiver
This driver adds support for TechnoTrend USB IR Receiver. It is a complete rewrite of the staging/media/lirc/lirc_ttusbir driver. It adds more accurate sample reporting and led control. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sean Young
Mauro Carvalho Chehab
parent
640583836b
commit
0938069fa0
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@ -274,6 +274,19 @@ config IR_IGUANA
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To compile this driver as a module, choose M here: the module will
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be called iguanair.
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config IR_TTUSBIR
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tristate "TechnoTrend USB IR Receiver"
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depends on RC_CORE
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select USB
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select NEW_LEDS
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select LEDS_CLASS
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---help---
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Say Y here if you want to use the TechnoTrend USB IR Receiver. The
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driver can control the led.
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To compile this driver as a module, choose M here: the module will
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be called ttusbir.
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config RC_LOOPBACK
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tristate "Remote Control Loopback Driver"
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depends on RC_CORE
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@ -28,3 +28,4 @@ obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o
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obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o
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obj-$(CONFIG_IR_GPIO_CIR) += gpio-ir-recv.o
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obj-$(CONFIG_IR_IGUANA) += iguanair.o
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obj-$(CONFIG_IR_TTUSBIR) += ttusbir.o
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@ -61,7 +61,7 @@ static struct rc_map_list tt_1500_map = {
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.map = {
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.scan = tt_1500,
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.size = ARRAY_SIZE(tt_1500),
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.rc_type = RC_TYPE_UNKNOWN, /* Legacy IR type */
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.rc_type = RC_TYPE_RC5,
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.name = RC_MAP_TT_1500,
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}
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};
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@ -0,0 +1,400 @@
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/*
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* TechnoTrend USB IR Receiver
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*
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* Copyright (C) 2012 Sean Young <sean@mess.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/input.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <media/rc-core.h>
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#define DRIVER_NAME "ttusbir"
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#define DRIVER_DESC "TechnoTrend USB IR Receiver"
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/*
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* The Windows driver uses 8 URBS, the original lirc drivers has a
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* configurable amount (2 default, 4 max). This device generates about 125
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* messages per second (!), whether IR is idle or not.
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*/
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#define NUM_URBS 4
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#define NS_PER_BYTE 62500
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#define NS_PER_BIT (NS_PER_BYTE/8)
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struct ttusbir {
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struct rc_dev *rc;
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struct device *dev;
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struct usb_device *udev;
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struct urb *urb[NUM_URBS];
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struct led_classdev led;
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struct urb *bulk_urb;
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uint8_t bulk_buffer[5];
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int bulk_out_endp, iso_in_endp;
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bool led_on, is_led_on;
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atomic_t led_complete;
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char phys[64];
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};
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static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
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{
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struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
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return tt->led_on ? LED_FULL : LED_OFF;
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}
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static void ttusbir_set_led(struct ttusbir *tt)
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{
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int ret;
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smp_mb();
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if (tt->led_on != tt->is_led_on &&
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atomic_add_unless(&tt->led_complete, 1, 1)) {
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tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
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ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
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if (ret && ret != -ENODEV) {
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dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
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ret);
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atomic_dec(&tt->led_complete);
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}
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}
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}
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static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
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led_brightness brightness)
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{
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struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
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tt->led_on = brightness != LED_OFF;
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ttusbir_set_led(tt);
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}
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/*
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* The urb cannot be reused until the urb completes
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*/
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static void ttusbir_bulk_complete(struct urb *urb)
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{
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struct ttusbir *tt = urb->context;
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atomic_dec(&tt->led_complete);
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switch (urb->status) {
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case 0:
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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usb_unlink_urb(urb);
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return;
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case -EPIPE:
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default:
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dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
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break;
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}
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ttusbir_set_led(tt);
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}
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/*
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* The data is one bit per sample, a set bit signifying silence and samples
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* being MSB first. Bit 0 can contain garbage so take it to be whatever
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* bit 1 is, so we don't have unexpected edges.
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*/
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static void ttusbir_process_ir_data(struct ttusbir *tt, uint8_t *buf)
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{
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unsigned i, v, b;
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DEFINE_IR_RAW_EVENT(rawir);
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init_ir_raw_event(&rawir);
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for (i = 0; i < 128; i++) {
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v = buf[i] & 0xfe;
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switch (v) {
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case 0xfe:
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rawir.pulse = false;
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rawir.duration = NS_PER_BYTE;
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ir_raw_event_store_with_filter(tt->rc, &rawir);
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break;
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case 0:
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rawir.pulse = true;
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rawir.duration = NS_PER_BYTE;
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ir_raw_event_store_with_filter(tt->rc, &rawir);
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break;
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default:
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/* one edge per byte */
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if (v & 2) {
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b = ffz(v | 1);
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rawir.pulse = true;
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} else {
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b = ffs(v) - 1;
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rawir.pulse = false;
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}
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rawir.duration = NS_PER_BIT * (8 - b);
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ir_raw_event_store_with_filter(tt->rc, &rawir);
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rawir.pulse = !rawir.pulse;
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rawir.duration = NS_PER_BIT * b;
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ir_raw_event_store_with_filter(tt->rc, &rawir);
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break;
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}
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}
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ir_raw_event_handle(tt->rc);
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}
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static void ttusbir_urb_complete(struct urb *urb)
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{
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struct ttusbir *tt = urb->context;
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int rc;
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switch (urb->status) {
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case 0:
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ttusbir_process_ir_data(tt, urb->transfer_buffer);
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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usb_unlink_urb(urb);
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return;
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case -EPIPE:
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default:
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dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
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break;
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}
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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if (rc && rc != -ENODEV)
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dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
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}
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static int __devinit ttusbir_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct ttusbir *tt;
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struct usb_interface_descriptor *idesc;
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struct usb_endpoint_descriptor *desc;
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struct rc_dev *rc;
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int i, j, ret;
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int altsetting = -1;
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tt = kzalloc(sizeof(*tt), GFP_KERNEL);
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rc = rc_allocate_device();
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if (!tt || !rc) {
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ret = -ENOMEM;
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goto out;
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}
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/* find the correct alt setting */
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for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
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int bulk_out_endp = -1, iso_in_endp = -1;
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idesc = &intf->altsetting[i].desc;
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for (j = 0; j < idesc->bNumEndpoints; j++) {
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desc = &intf->altsetting[i].endpoint[j].desc;
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if (usb_endpoint_dir_in(desc) &&
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usb_endpoint_xfer_isoc(desc) &&
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desc->wMaxPacketSize == 0x10)
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iso_in_endp = j;
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else if (usb_endpoint_dir_out(desc) &&
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usb_endpoint_xfer_bulk(desc) &&
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desc->wMaxPacketSize == 0x20)
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bulk_out_endp = j;
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if (bulk_out_endp != -1 && iso_in_endp != -1) {
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tt->bulk_out_endp = bulk_out_endp;
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tt->iso_in_endp = iso_in_endp;
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altsetting = i;
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break;
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}
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}
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}
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if (altsetting == -1) {
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dev_err(&intf->dev, "cannot find expected altsetting\n");
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ret = -ENODEV;
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goto out;
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}
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tt->dev = &intf->dev;
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tt->udev = interface_to_usbdev(intf);
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tt->rc = rc;
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ret = usb_set_interface(tt->udev, 0, altsetting);
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if (ret)
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goto out;
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for (i = 0; i < NUM_URBS; i++) {
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struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
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void *buffer;
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if (!urb) {
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ret = -ENOMEM;
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goto out;
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}
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urb->dev = tt->udev;
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urb->context = tt;
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urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
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urb->interval = 1;
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buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
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&urb->transfer_dma);
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if (!buffer) {
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usb_free_urb(urb);
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ret = -ENOMEM;
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goto out;
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}
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urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_ISO_ASAP;
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urb->transfer_buffer = buffer;
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urb->complete = ttusbir_urb_complete;
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urb->number_of_packets = 8;
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urb->transfer_buffer_length = 128;
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for (j = 0; j < 8; j++) {
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urb->iso_frame_desc[j].offset = j * 16;
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urb->iso_frame_desc[j].length = 16;
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}
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tt->urb[i] = urb;
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}
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tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!tt->bulk_urb) {
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ret = -ENOMEM;
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goto out;
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}
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tt->bulk_buffer[0] = 0xaa;
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tt->bulk_buffer[1] = 0x01;
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tt->bulk_buffer[2] = 0x05;
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tt->bulk_buffer[3] = 0x01;
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usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
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tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
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ttusbir_bulk_complete, tt);
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tt->led.name = "ttusbir:yellow:power";
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tt->led.brightness_set = ttusbir_brightness_set;
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tt->led.brightness_get = ttusbir_brightness_get;
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tt->is_led_on = tt->led_on = true;
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atomic_set(&tt->led_complete, 0);
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ret = led_classdev_register(&intf->dev, &tt->led);
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if (ret)
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goto out;
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usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));
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rc->input_name = DRIVER_DESC;
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rc->input_phys = tt->phys;
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usb_to_input_id(tt->udev, &rc->input_id);
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rc->dev.parent = &intf->dev;
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rc->driver_type = RC_DRIVER_IR_RAW;
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rc->allowed_protos = RC_TYPE_ALL;
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rc->priv = tt;
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rc->driver_name = DRIVER_NAME;
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rc->map_name = RC_MAP_TT_1500;
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rc->timeout = MS_TO_NS(100);
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/*
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* The precision is NS_PER_BIT, but since every 8th bit can be
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* overwritten with garbage the accuracy is at best 2 * NS_PER_BIT.
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*/
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rc->rx_resolution = NS_PER_BIT;
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ret = rc_register_device(rc);
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if (ret) {
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dev_err(&intf->dev, "failed to register rc device %d\n", ret);
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goto out2;
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}
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usb_set_intfdata(intf, tt);
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for (i = 0; i < NUM_URBS; i++) {
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ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
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if (ret) {
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dev_err(tt->dev, "failed to submit urb %d\n", ret);
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goto out3;
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}
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}
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return 0;
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out3:
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rc_unregister_device(rc);
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out2:
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led_classdev_unregister(&tt->led);
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out:
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if (tt) {
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for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
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struct urb *urb = tt->urb[i];
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usb_kill_urb(urb);
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usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
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urb->transfer_dma);
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usb_free_urb(urb);
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}
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usb_kill_urb(tt->bulk_urb);
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usb_free_urb(tt->bulk_urb);
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kfree(tt);
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}
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rc_free_device(rc);
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return ret;
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}
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static void __devexit ttusbir_disconnect(struct usb_interface *intf)
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{
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struct ttusbir *tt = usb_get_intfdata(intf);
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int i;
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rc_unregister_device(tt->rc);
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led_classdev_unregister(&tt->led);
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for (i = 0; i < NUM_URBS; i++) {
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usb_kill_urb(tt->urb[i]);
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usb_free_coherent(tt->udev, 128, tt->urb[i]->transfer_buffer,
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tt->urb[i]->transfer_dma);
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usb_free_urb(tt->urb[i]);
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}
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usb_kill_urb(tt->bulk_urb);
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usb_free_urb(tt->bulk_urb);
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usb_set_intfdata(intf, NULL);
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kfree(tt);
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}
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static const struct usb_device_id ttusbir_table[] = {
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{ USB_DEVICE(0x0b48, 0x2003) },
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{ }
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};
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static struct usb_driver ttusbir_driver = {
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.name = DRIVER_NAME,
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.id_table = ttusbir_table,
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.probe = ttusbir_probe,
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.disconnect = __devexit_p(ttusbir_disconnect)
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};
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module_usb_driver(ttusbir_driver);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Sean Young <sean@mess.org>");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(usb, ttusbir_table);
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