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436 lines
9.7 KiB
436 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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 <[email protected]> |
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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 US_PER_BYTE 62 |
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#define US_PER_BIT (US_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 && tt->udev && |
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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) { |
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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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struct ir_raw_event rawir = {}; |
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unsigned i, v, b; |
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bool event = false; |
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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 = US_PER_BYTE; |
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if (ir_raw_event_store_with_filter(tt->rc, &rawir)) |
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event = true; |
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break; |
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case 0: |
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rawir.pulse = true; |
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rawir.duration = US_PER_BYTE; |
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if (ir_raw_event_store_with_filter(tt->rc, &rawir)) |
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event = true; |
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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 = US_PER_BIT * (8 - b); |
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if (ir_raw_event_store_with_filter(tt->rc, &rawir)) |
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event = true; |
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rawir.pulse = !rawir.pulse; |
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rawir.duration = US_PER_BIT * b; |
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if (ir_raw_event_store_with_filter(tt->rc, &rawir)) |
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event = true; |
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break; |
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} |
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} |
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/* don't wakeup when there's nothing to do */ |
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if (event) |
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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 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(RC_DRIVER_IR_RAW); |
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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 max_packet, 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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max_packet = le16_to_cpu(desc->wMaxPacketSize); |
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if (usb_endpoint_dir_in(desc) && |
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usb_endpoint_xfer_isoc(desc) && |
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max_packet == 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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max_packet == 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:green:power"; |
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tt->led.default_trigger = "rc-feedback"; |
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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->device_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->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER; |
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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->min_timeout = 1; |
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rc->timeout = IR_DEFAULT_TIMEOUT; |
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rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT; |
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/* |
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* The precision is US_PER_BIT, but since every 8th bit can be |
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* overwritten with garbage the accuracy is at best 2 * US_PER_BIT. |
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*/ |
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rc->rx_resolution = 2 * US_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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rc = NULL; |
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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 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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struct usb_device *udev = tt->udev; |
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int i; |
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tt->udev = NULL; |
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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(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 int ttusbir_suspend(struct usb_interface *intf, pm_message_t message) |
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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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for (i = 0; i < NUM_URBS; i++) |
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usb_kill_urb(tt->urb[i]); |
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led_classdev_suspend(&tt->led); |
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usb_kill_urb(tt->bulk_urb); |
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return 0; |
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} |
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static int ttusbir_resume(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, rc; |
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tt->is_led_on = true; |
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led_classdev_resume(&tt->led); |
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for (i = 0; i < NUM_URBS; i++) { |
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rc = usb_submit_urb(tt->urb[i], GFP_KERNEL); |
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if (rc) { |
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dev_warn(tt->dev, "failed to submit urb: %d\n", rc); |
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break; |
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} |
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} |
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return rc; |
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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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.suspend = ttusbir_suspend, |
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.resume = ttusbir_resume, |
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.reset_resume = ttusbir_resume, |
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.disconnect = 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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(usb, ttusbir_table); |
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