// SPDX-License-Identifier: GPL-2.0-only
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/*
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* tm6000-input.c - driver for TM5600/TM6000/TM6010 USB video capture devices
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*
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* Copyright (C) 2010 Stefan Ringel <stefan.ringel@arcor.de>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <media/rc-core.h>
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#include "tm6000.h"
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#include "tm6000-regs.h"
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static unsigned int ir_debug;
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module_param(ir_debug, int, 0644);
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MODULE_PARM_DESC(ir_debug, "debug message level");
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static unsigned int enable_ir = 1;
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module_param(enable_ir, int, 0644);
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MODULE_PARM_DESC(enable_ir, "enable ir (default is enable)");
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static unsigned int ir_clock_mhz = 12;
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module_param(ir_clock_mhz, int, 0644);
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MODULE_PARM_DESC(ir_clock_mhz, "ir clock, in MHz");
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#define URB_SUBMIT_DELAY 100 /* ms - Delay to submit an URB request on retrial and init */
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#define URB_INT_LED_DELAY 100 /* ms - Delay to turn led on again on int mode */
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#undef dprintk
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#define dprintk(level, fmt, arg...) do {\
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if (ir_debug >= level) \
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printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
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} while (0)
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struct tm6000_ir_poll_result {
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u16 rc_data;
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};
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struct tm6000_IR {
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struct tm6000_core *dev;
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struct rc_dev *rc;
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char name[32];
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char phys[32];
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/* poll expernal decoder */
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int polling;
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struct delayed_work work;
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u8 wait:1;
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u8 pwled:2;
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u8 submit_urb:1;
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struct urb *int_urb;
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/* IR device properties */
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u64 rc_proto;
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};
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void tm6000_ir_wait(struct tm6000_core *dev, u8 state)
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{
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struct tm6000_IR *ir = dev->ir;
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if (!dev->ir)
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return;
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dprintk(2, "%s: %i\n",__func__, ir->wait);
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if (state)
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ir->wait = 1;
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else
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ir->wait = 0;
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}
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static int tm6000_ir_config(struct tm6000_IR *ir)
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{
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struct tm6000_core *dev = ir->dev;
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u32 pulse = 0, leader = 0;
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dprintk(2, "%s\n",__func__);
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/*
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* The IR decoder supports RC-5 or NEC, with a configurable timing.
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* The timing configuration there is not that accurate, as it uses
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* approximate values. The NEC spec mentions a 562.5 unit period,
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* and RC-5 uses a 888.8 period.
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* Currently, driver assumes a clock provided by a 12 MHz XTAL, but
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* a modprobe parameter can adjust it.
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* Adjustments are required for other timings.
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* It seems that the 900ms timing for NEC is used to detect a RC-5
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* IR, in order to discard such decoding
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*/
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switch (ir->rc_proto) {
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case RC_PROTO_BIT_NEC:
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leader = 900; /* ms */
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pulse = 700; /* ms - the actual value would be 562 */
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break;
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default:
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case RC_PROTO_BIT_RC5:
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leader = 900; /* ms - from the NEC decoding */
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pulse = 1780; /* ms - The actual value would be 1776 */
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break;
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}
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pulse = ir_clock_mhz * pulse;
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leader = ir_clock_mhz * leader;
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if (ir->rc_proto == RC_PROTO_BIT_NEC)
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leader = leader | 0x8000;
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dprintk(2, "%s: %s, %d MHz, leader = 0x%04x, pulse = 0x%06x \n",
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__func__,
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(ir->rc_proto == RC_PROTO_BIT_NEC) ? "NEC" : "RC-5",
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ir_clock_mhz, leader, pulse);
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/* Remote WAKEUP = enable, normal mode, from IR decoder output */
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tm6000_set_reg(dev, TM6010_REQ07_RE5_REMOTE_WAKEUP, 0xfe);
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/* Enable IR reception on non-busrt mode */
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tm6000_set_reg(dev, TM6010_REQ07_RD8_IR, 0x2f);
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/* IR_WKUP_SEL = Low byte in decoded IR data */
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tm6000_set_reg(dev, TM6010_REQ07_RDA_IR_WAKEUP_SEL, 0xff);
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/* IR_WKU_ADD code */
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tm6000_set_reg(dev, TM6010_REQ07_RDB_IR_WAKEUP_ADD, 0xff);
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tm6000_set_reg(dev, TM6010_REQ07_RDC_IR_LEADER1, leader >> 8);
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tm6000_set_reg(dev, TM6010_REQ07_RDD_IR_LEADER0, leader);
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tm6000_set_reg(dev, TM6010_REQ07_RDE_IR_PULSE_CNT1, pulse >> 8);
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tm6000_set_reg(dev, TM6010_REQ07_RDF_IR_PULSE_CNT0, pulse);
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if (!ir->polling)
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tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
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else
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tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 1);
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msleep(10);
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/* Shows that IR is working via the LED */
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tm6000_flash_led(dev, 0);
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msleep(100);
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tm6000_flash_led(dev, 1);
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ir->pwled = 1;
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return 0;
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}
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static void tm6000_ir_keydown(struct tm6000_IR *ir,
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const char *buf, unsigned int len)
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{
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u8 device, command;
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u32 scancode;
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enum rc_proto protocol;
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if (len < 1)
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return;
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command = buf[0];
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device = (len > 1 ? buf[1] : 0x0);
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switch (ir->rc_proto) {
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case RC_PROTO_BIT_RC5:
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protocol = RC_PROTO_RC5;
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scancode = RC_SCANCODE_RC5(device, command);
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break;
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case RC_PROTO_BIT_NEC:
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protocol = RC_PROTO_NEC;
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scancode = RC_SCANCODE_NEC(device, command);
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break;
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default:
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protocol = RC_PROTO_OTHER;
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scancode = RC_SCANCODE_OTHER(device << 8 | command);
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break;
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}
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dprintk(1, "%s, protocol: 0x%04x, scancode: 0x%08x\n",
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__func__, protocol, scancode);
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rc_keydown(ir->rc, protocol, scancode, 0);
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}
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static void tm6000_ir_urb_received(struct urb *urb)
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{
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struct tm6000_core *dev = urb->context;
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struct tm6000_IR *ir = dev->ir;
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char *buf;
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dprintk(2, "%s\n",__func__);
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if (urb->status < 0 || urb->actual_length <= 0) {
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printk(KERN_INFO "tm6000: IR URB failure: status: %i, length %i\n",
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urb->status, urb->actual_length);
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ir->submit_urb = 1;
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schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
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return;
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}
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buf = urb->transfer_buffer;
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if (ir_debug)
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print_hex_dump(KERN_DEBUG, "tm6000: IR data: ",
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DUMP_PREFIX_OFFSET,16, 1,
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buf, urb->actual_length, false);
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tm6000_ir_keydown(ir, urb->transfer_buffer, urb->actual_length);
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usb_submit_urb(urb, GFP_ATOMIC);
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/*
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* Flash the led. We can't do it here, as it is running on IRQ context.
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* So, use the scheduler to do it, in a few ms.
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*/
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ir->pwled = 2;
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schedule_delayed_work(&ir->work, msecs_to_jiffies(10));
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}
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static void tm6000_ir_handle_key(struct work_struct *work)
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{
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struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
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struct tm6000_core *dev = ir->dev;
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int rc;
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u8 buf[2];
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if (ir->wait)
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return;
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dprintk(3, "%s\n",__func__);
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rc = tm6000_read_write_usb(dev, USB_DIR_IN |
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USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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REQ_02_GET_IR_CODE, 0, 0, buf, 2);
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if (rc < 0)
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return;
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/* Check if something was read */
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if ((buf[0] & 0xff) == 0xff) {
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if (!ir->pwled) {
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tm6000_flash_led(dev, 1);
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ir->pwled = 1;
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}
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return;
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}
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tm6000_ir_keydown(ir, buf, rc);
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tm6000_flash_led(dev, 0);
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ir->pwled = 0;
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/* Re-schedule polling */
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schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
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}
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static void tm6000_ir_int_work(struct work_struct *work)
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{
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struct tm6000_IR *ir = container_of(work, struct tm6000_IR, work.work);
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struct tm6000_core *dev = ir->dev;
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int rc;
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dprintk(3, "%s, submit_urb = %d, pwled = %d\n",__func__, ir->submit_urb,
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ir->pwled);
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if (ir->submit_urb) {
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dprintk(3, "Resubmit urb\n");
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tm6000_set_reg(dev, REQ_04_EN_DISABLE_MCU_INT, 2, 0);
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rc = usb_submit_urb(ir->int_urb, GFP_ATOMIC);
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if (rc < 0) {
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printk(KERN_ERR "tm6000: Can't submit an IR interrupt. Error %i\n",
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rc);
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/* Retry in 100 ms */
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schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
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return;
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}
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ir->submit_urb = 0;
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}
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/* Led is enabled only if USB submit doesn't fail */
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if (ir->pwled == 2) {
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tm6000_flash_led(dev, 0);
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ir->pwled = 0;
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schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_INT_LED_DELAY));
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} else if (!ir->pwled) {
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tm6000_flash_led(dev, 1);
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ir->pwled = 1;
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}
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}
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static int tm6000_ir_start(struct rc_dev *rc)
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{
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struct tm6000_IR *ir = rc->priv;
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dprintk(2, "%s\n",__func__);
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schedule_delayed_work(&ir->work, 0);
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return 0;
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}
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static void tm6000_ir_stop(struct rc_dev *rc)
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{
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struct tm6000_IR *ir = rc->priv;
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dprintk(2, "%s\n",__func__);
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cancel_delayed_work_sync(&ir->work);
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}
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static int tm6000_ir_change_protocol(struct rc_dev *rc, u64 *rc_proto)
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{
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struct tm6000_IR *ir = rc->priv;
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if (!ir)
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return 0;
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dprintk(2, "%s\n",__func__);
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ir->rc_proto = *rc_proto;
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tm6000_ir_config(ir);
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/* TODO */
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return 0;
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}
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static int __tm6000_ir_int_start(struct rc_dev *rc)
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{
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struct tm6000_IR *ir = rc->priv;
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struct tm6000_core *dev;
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int pipe, size;
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int err = -ENOMEM;
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if (!ir)
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return -ENODEV;
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dev = ir->dev;
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dprintk(2, "%s\n",__func__);
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ir->int_urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (!ir->int_urb)
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return -ENOMEM;
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pipe = usb_rcvintpipe(dev->udev,
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dev->int_in.endp->desc.bEndpointAddress
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& USB_ENDPOINT_NUMBER_MASK);
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size = usb_maxpacket(dev->udev, pipe, usb_pipeout(pipe));
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dprintk(1, "IR max size: %d\n", size);
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ir->int_urb->transfer_buffer = kzalloc(size, GFP_ATOMIC);
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if (!ir->int_urb->transfer_buffer) {
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usb_free_urb(ir->int_urb);
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return err;
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}
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dprintk(1, "int interval: %d\n", dev->int_in.endp->desc.bInterval);
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usb_fill_int_urb(ir->int_urb, dev->udev, pipe,
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ir->int_urb->transfer_buffer, size,
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tm6000_ir_urb_received, dev,
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dev->int_in.endp->desc.bInterval);
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ir->submit_urb = 1;
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schedule_delayed_work(&ir->work, msecs_to_jiffies(URB_SUBMIT_DELAY));
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return 0;
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}
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static void __tm6000_ir_int_stop(struct rc_dev *rc)
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{
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struct tm6000_IR *ir = rc->priv;
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if (!ir || !ir->int_urb)
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return;
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dprintk(2, "%s\n",__func__);
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usb_kill_urb(ir->int_urb);
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kfree(ir->int_urb->transfer_buffer);
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usb_free_urb(ir->int_urb);
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ir->int_urb = NULL;
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}
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int tm6000_ir_int_start(struct tm6000_core *dev)
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{
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struct tm6000_IR *ir = dev->ir;
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if (!ir)
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return 0;
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return __tm6000_ir_int_start(ir->rc);
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}
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void tm6000_ir_int_stop(struct tm6000_core *dev)
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{
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struct tm6000_IR *ir = dev->ir;
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if (!ir || !ir->rc)
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return;
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__tm6000_ir_int_stop(ir->rc);
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}
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int tm6000_ir_init(struct tm6000_core *dev)
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{
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struct tm6000_IR *ir;
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struct rc_dev *rc;
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int err = -ENOMEM;
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u64 rc_proto;
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if (!enable_ir)
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return -ENODEV;
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if (!dev->caps.has_remote)
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return 0;
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if (!dev->ir_codes)
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return 0;
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ir = kzalloc(sizeof(*ir), GFP_ATOMIC);
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rc = rc_allocate_device(RC_DRIVER_SCANCODE);
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if (!ir || !rc)
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goto out;
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dprintk(2, "%s\n", __func__);
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/* record handles to ourself */
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ir->dev = dev;
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dev->ir = ir;
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ir->rc = rc;
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/* input setup */
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rc->allowed_protocols = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_NEC;
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/* Needed, in order to support NEC remotes with 24 or 32 bits */
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rc->scancode_mask = 0xffff;
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rc->priv = ir;
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rc->change_protocol = tm6000_ir_change_protocol;
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if (dev->int_in.endp) {
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rc->open = __tm6000_ir_int_start;
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rc->close = __tm6000_ir_int_stop;
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INIT_DELAYED_WORK(&ir->work, tm6000_ir_int_work);
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} else {
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rc->open = tm6000_ir_start;
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rc->close = tm6000_ir_stop;
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ir->polling = 50;
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INIT_DELAYED_WORK(&ir->work, tm6000_ir_handle_key);
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}
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snprintf(ir->name, sizeof(ir->name), "tm5600/60x0 IR (%s)",
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dev->name);
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usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
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strlcat(ir->phys, "/input0", sizeof(ir->phys));
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rc_proto = RC_PROTO_BIT_UNKNOWN;
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tm6000_ir_change_protocol(rc, &rc_proto);
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rc->device_name = ir->name;
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rc->input_phys = ir->phys;
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rc->input_id.bustype = BUS_USB;
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rc->input_id.version = 1;
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rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
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rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
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rc->map_name = dev->ir_codes;
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rc->driver_name = "tm6000";
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rc->dev.parent = &dev->udev->dev;
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/* ir register */
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err = rc_register_device(rc);
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if (err)
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goto out;
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return 0;
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out:
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dev->ir = NULL;
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rc_free_device(rc);
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kfree(ir);
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return err;
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}
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int tm6000_ir_fini(struct tm6000_core *dev)
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{
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struct tm6000_IR *ir = dev->ir;
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/* skip detach on non attached board */
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if (!ir)
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return 0;
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dprintk(2, "%s\n",__func__);
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if (!ir->polling)
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__tm6000_ir_int_stop(ir->rc);
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tm6000_ir_stop(ir->rc);
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/* Turn off the led */
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tm6000_flash_led(dev, 0);
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ir->pwled = 0;
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rc_unregister_device(ir->rc);
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kfree(ir);
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dev->ir = NULL;
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return 0;
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}
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