// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (c) 2003 Gerd Knorr
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* Copyright (c) 2003 Pavel Machek
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/interrupt.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include "bttv.h"
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#include "bttvp.h"
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static int ir_debug;
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module_param(ir_debug, int, 0644);
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static int ir_rc5_remote_gap = 885;
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module_param(ir_rc5_remote_gap, int, 0644);
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#undef dprintk
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#define dprintk(fmt, ...) \
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do { \
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if (ir_debug >= 1) \
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pr_info(fmt, ##__VA_ARGS__); \
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} while (0)
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#define DEVNAME "bttv-input"
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#define MODULE_NAME "bttv"
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/* ---------------------------------------------------------------------- */
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static void ir_handle_key(struct bttv *btv)
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{
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struct bttv_ir *ir = btv->remote;
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u32 gpio,data;
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/* read gpio value */
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gpio = bttv_gpio_read(&btv->c);
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if (ir->polling) {
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if (ir->last_gpio == gpio)
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return;
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ir->last_gpio = gpio;
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}
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/* extract data */
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data = ir_extract_bits(gpio, ir->mask_keycode);
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dprintk("irq gpio=0x%x code=%d | %s%s%s\n",
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gpio, data,
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ir->polling ? "poll" : "irq",
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(gpio & ir->mask_keydown) ? " down" : "",
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(gpio & ir->mask_keyup) ? " up" : "");
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if ((ir->mask_keydown && (gpio & ir->mask_keydown)) ||
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(ir->mask_keyup && !(gpio & ir->mask_keyup))) {
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rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data, 0);
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} else {
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/* HACK: Probably, ir->mask_keydown is missing
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for this board */
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if (btv->c.type == BTTV_BOARD_WINFAST2000)
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rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
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0);
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rc_keyup(ir->dev);
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}
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}
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static void ir_enltv_handle_key(struct bttv *btv)
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{
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struct bttv_ir *ir = btv->remote;
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u32 gpio, data, keyup;
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/* read gpio value */
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gpio = bttv_gpio_read(&btv->c);
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/* extract data */
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data = ir_extract_bits(gpio, ir->mask_keycode);
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/* Check if it is keyup */
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keyup = (gpio & ir->mask_keyup) ? 1UL << 31 : 0;
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if ((ir->last_gpio & 0x7f) != data) {
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dprintk("gpio=0x%x code=%d | %s\n",
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gpio, data,
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(gpio & ir->mask_keyup) ? " up" : "up/down");
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rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data, 0);
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if (keyup)
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rc_keyup(ir->dev);
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} else {
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if ((ir->last_gpio & 1UL << 31) == keyup)
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return;
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dprintk("(cnt) gpio=0x%x code=%d | %s\n",
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gpio, data,
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(gpio & ir->mask_keyup) ? " up" : "down");
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if (keyup)
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rc_keyup(ir->dev);
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else
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rc_keydown_notimeout(ir->dev, RC_PROTO_UNKNOWN, data,
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0);
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}
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ir->last_gpio = data | keyup;
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}
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static int bttv_rc5_irq(struct bttv *btv);
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void bttv_input_irq(struct bttv *btv)
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{
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struct bttv_ir *ir = btv->remote;
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if (ir->rc5_gpio)
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bttv_rc5_irq(btv);
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else if (!ir->polling)
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ir_handle_key(btv);
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}
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static void bttv_input_timer(struct timer_list *t)
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{
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struct bttv_ir *ir = from_timer(ir, t, timer);
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struct bttv *btv = ir->btv;
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if (btv->c.type == BTTV_BOARD_ENLTV_FM_2)
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ir_enltv_handle_key(btv);
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else
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ir_handle_key(btv);
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mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
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}
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/*
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* FIXME: Nebula digi uses the legacy way to decode RC5, instead of relying
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* on the rc-core way. As we need to be sure that both IRQ transitions are
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* properly triggered, Better to touch it only with this hardware for
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* testing.
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*/
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#define RC5_START(x) (((x) >> 12) & 0x03)
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#define RC5_TOGGLE(x) (((x) >> 11) & 0x01)
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#define RC5_ADDR(x) (((x) >> 6) & 0x1f)
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#define RC5_INSTR(x) (((x) >> 0) & 0x3f)
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/* decode raw bit pattern to RC5 code */
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static u32 bttv_rc5_decode(unsigned int code)
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{
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unsigned int org_code = code;
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unsigned int pair;
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unsigned int rc5 = 0;
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int i;
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for (i = 0; i < 14; ++i) {
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pair = code & 0x3;
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code >>= 2;
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rc5 <<= 1;
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switch (pair) {
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case 0:
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case 2:
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break;
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case 1:
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rc5 |= 1;
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break;
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case 3:
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dprintk("rc5_decode(%x) bad code\n",
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org_code);
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return 0;
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}
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}
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dprintk("code=%x, rc5=%x, start=%x, toggle=%x, address=%x, instr=%x\n",
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rc5, org_code, RC5_START(rc5),
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RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
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return rc5;
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}
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static void bttv_rc5_timer_end(struct timer_list *t)
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{
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struct bttv_ir *ir = from_timer(ir, t, timer);
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ktime_t tv;
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u32 gap, rc5, scancode;
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u8 toggle, command, system;
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/* get time */
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tv = ktime_get();
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gap = ktime_to_us(ktime_sub(tv, ir->base_time));
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/* avoid overflow with gap >1s */
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if (gap > USEC_PER_SEC) {
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gap = 200000;
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}
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/* signal we're ready to start a new code */
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ir->active = false;
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/* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
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if (gap < 28000) {
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dprintk("spurious timer_end\n");
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return;
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}
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if (ir->last_bit < 20) {
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/* ignore spurious codes (caused by light/other remotes) */
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dprintk("short code: %x\n", ir->code);
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return;
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}
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ir->code = (ir->code << ir->shift_by) | 1;
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rc5 = bttv_rc5_decode(ir->code);
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toggle = RC5_TOGGLE(rc5);
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system = RC5_ADDR(rc5);
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command = RC5_INSTR(rc5);
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switch (RC5_START(rc5)) {
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case 0x3:
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break;
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case 0x2:
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command += 0x40;
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break;
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default:
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return;
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}
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scancode = RC_SCANCODE_RC5(system, command);
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rc_keydown(ir->dev, RC_PROTO_RC5, scancode, toggle);
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dprintk("scancode %x, toggle %x\n", scancode, toggle);
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}
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static int bttv_rc5_irq(struct bttv *btv)
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{
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struct bttv_ir *ir = btv->remote;
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ktime_t tv;
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u32 gpio;
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u32 gap;
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unsigned long current_jiffies;
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/* read gpio port */
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gpio = bttv_gpio_read(&btv->c);
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/* get time of bit */
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current_jiffies = jiffies;
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tv = ktime_get();
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gap = ktime_to_us(ktime_sub(tv, ir->base_time));
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/* avoid overflow with gap >1s */
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if (gap > USEC_PER_SEC) {
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gap = 200000;
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}
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dprintk("RC5 IRQ: gap %d us for %s\n",
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gap, (gpio & 0x20) ? "mark" : "space");
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/* remote IRQ? */
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if (!(gpio & 0x20))
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return 0;
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/* active code => add bit */
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if (ir->active) {
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/* only if in the code (otherwise spurious IRQ or timer
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late) */
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if (ir->last_bit < 28) {
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ir->last_bit = (gap - ir_rc5_remote_gap / 2) /
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ir_rc5_remote_gap;
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ir->code |= 1 << ir->last_bit;
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}
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/* starting new code */
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} else {
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ir->active = true;
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ir->code = 0;
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ir->base_time = tv;
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ir->last_bit = 0;
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mod_timer(&ir->timer, current_jiffies + msecs_to_jiffies(30));
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}
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/* toggle GPIO pin 4 to reset the irq */
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bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
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bttv_gpio_write(&btv->c, gpio | (1 << 4));
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return 1;
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}
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/* ---------------------------------------------------------------------- */
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static void bttv_ir_start(struct bttv_ir *ir)
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{
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if (ir->polling) {
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timer_setup(&ir->timer, bttv_input_timer, 0);
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ir->timer.expires = jiffies + msecs_to_jiffies(1000);
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add_timer(&ir->timer);
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} else if (ir->rc5_gpio) {
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/* set timer_end for code completion */
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timer_setup(&ir->timer, bttv_rc5_timer_end, 0);
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ir->shift_by = 1;
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ir->rc5_remote_gap = ir_rc5_remote_gap;
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}
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}
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static void bttv_ir_stop(struct bttv *btv)
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{
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if (btv->remote->polling)
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del_timer_sync(&btv->remote->timer);
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if (btv->remote->rc5_gpio) {
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u32 gpio;
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del_timer_sync(&btv->remote->timer);
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gpio = bttv_gpio_read(&btv->c);
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bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
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}
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}
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/*
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* Get_key functions used by I2C remotes
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*/
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static int get_key_pv951(struct IR_i2c *ir, enum rc_proto *protocol,
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u32 *scancode, u8 *toggle)
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{
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int rc;
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unsigned char b;
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/* poll IR chip */
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rc = i2c_master_recv(ir->c, &b, 1);
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if (rc != 1) {
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dprintk("read error\n");
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if (rc < 0)
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return rc;
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return -EIO;
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}
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/* ignore 0xaa */
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if (b==0xaa)
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return 0;
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dprintk("key %02x\n", b);
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/*
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* NOTE:
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* lirc_i2c maps the pv951 code as:
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* addr = 0x61D6
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* cmd = bit_reverse (b)
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* So, it seems that this device uses NEC extended
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* I decided to not fix the table, due to two reasons:
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* 1) Without the actual device, this is only a guess;
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* 2) As the addr is not reported via I2C, nor can be changed,
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* the device is bound to the vendor-provided RC.
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*/
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*protocol = RC_PROTO_UNKNOWN;
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*scancode = b;
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*toggle = 0;
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return 1;
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}
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/* Instantiate the I2C IR receiver device, if present */
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void init_bttv_i2c_ir(struct bttv *btv)
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{
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static const unsigned short addr_list[] = {
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0x1a, 0x18, 0x64, 0x30, 0x71,
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I2C_CLIENT_END
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};
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struct i2c_board_info info;
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struct i2c_client *i2c_dev;
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if (0 != btv->i2c_rc)
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return;
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memset(&info, 0, sizeof(struct i2c_board_info));
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memset(&btv->init_data, 0, sizeof(btv->init_data));
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strscpy(info.type, "ir_video", I2C_NAME_SIZE);
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switch (btv->c.type) {
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case BTTV_BOARD_PV951:
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btv->init_data.name = "PV951";
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btv->init_data.get_key = get_key_pv951;
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btv->init_data.ir_codes = RC_MAP_PV951;
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info.addr = 0x4b;
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break;
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}
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if (btv->init_data.name) {
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info.platform_data = &btv->init_data;
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i2c_dev = i2c_new_client_device(&btv->c.i2c_adap, &info);
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} else {
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/*
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* The external IR receiver is at i2c address 0x34 (0x35 for
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* reads). Future Hauppauge cards will have an internal
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* receiver at 0x30 (0x31 for reads). In theory, both can be
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* fitted, and Hauppauge suggest an external overrides an
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* internal.
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* That's why we probe 0x1a (~0x34) first. CB
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*/
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i2c_dev = i2c_new_scanned_device(&btv->c.i2c_adap, &info, addr_list, NULL);
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}
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if (IS_ERR(i2c_dev))
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return;
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#if defined(CONFIG_MODULES) && defined(MODULE)
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request_module("ir-kbd-i2c");
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#endif
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}
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int bttv_input_init(struct bttv *btv)
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{
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struct bttv_ir *ir;
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char *ir_codes = NULL;
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struct rc_dev *rc;
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int err = -ENOMEM;
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if (!btv->has_remote)
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return -ENODEV;
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ir = kzalloc(sizeof(*ir),GFP_KERNEL);
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rc = rc_allocate_device(RC_DRIVER_SCANCODE);
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if (!ir || !rc)
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goto err_out_free;
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/* detect & configure */
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switch (btv->c.type) {
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case BTTV_BOARD_AVERMEDIA:
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case BTTV_BOARD_AVPHONE98:
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case BTTV_BOARD_AVERMEDIA98:
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ir_codes = RC_MAP_AVERMEDIA;
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ir->mask_keycode = 0xf88000;
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ir->mask_keydown = 0x010000;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_AVDVBT_761:
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case BTTV_BOARD_AVDVBT_771:
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ir_codes = RC_MAP_AVERMEDIA_DVBT;
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ir->mask_keycode = 0x0f00c0;
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ir->mask_keydown = 0x000020;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_PXELVWPLTVPAK:
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ir_codes = RC_MAP_PIXELVIEW;
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ir->mask_keycode = 0x003e00;
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ir->mask_keyup = 0x010000;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_PV_M4900:
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case BTTV_BOARD_PV_BT878P_9B:
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case BTTV_BOARD_PV_BT878P_PLUS:
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ir_codes = RC_MAP_PIXELVIEW;
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ir->mask_keycode = 0x001f00;
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ir->mask_keyup = 0x008000;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_WINFAST2000:
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ir_codes = RC_MAP_WINFAST;
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ir->mask_keycode = 0x1f8;
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break;
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case BTTV_BOARD_MAGICTVIEW061:
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case BTTV_BOARD_MAGICTVIEW063:
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ir_codes = RC_MAP_WINFAST;
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ir->mask_keycode = 0x0008e000;
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ir->mask_keydown = 0x00200000;
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break;
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case BTTV_BOARD_APAC_VIEWCOMP:
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ir_codes = RC_MAP_APAC_VIEWCOMP;
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ir->mask_keycode = 0x001f00;
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ir->mask_keyup = 0x008000;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_ASKEY_CPH03X:
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case BTTV_BOARD_CONCEPTRONIC_CTVFMI2:
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case BTTV_BOARD_CONTVFMI:
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case BTTV_BOARD_KWORLD_VSTREAM_XPERT:
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ir_codes = RC_MAP_PIXELVIEW;
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ir->mask_keycode = 0x001F00;
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ir->mask_keyup = 0x006000;
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ir->polling = 50; // ms
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break;
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case BTTV_BOARD_NEBULA_DIGITV:
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ir_codes = RC_MAP_NEBULA;
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ir->rc5_gpio = true;
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break;
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case BTTV_BOARD_MACHTV_MAGICTV:
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ir_codes = RC_MAP_APAC_VIEWCOMP;
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ir->mask_keycode = 0x001F00;
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ir->mask_keyup = 0x004000;
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ir->polling = 50; /* ms */
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break;
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case BTTV_BOARD_KOZUMI_KTV_01C:
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ir_codes = RC_MAP_PCTV_SEDNA;
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ir->mask_keycode = 0x001f00;
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ir->mask_keyup = 0x006000;
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ir->polling = 50; /* ms */
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break;
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case BTTV_BOARD_ENLTV_FM_2:
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ir_codes = RC_MAP_ENCORE_ENLTV2;
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ir->mask_keycode = 0x00fd00;
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ir->mask_keyup = 0x000080;
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ir->polling = 1; /* ms */
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ir->last_gpio = ir_extract_bits(bttv_gpio_read(&btv->c),
|
ir->mask_keycode);
|
break;
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}
|
|
if (!ir_codes) {
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dprintk("Ooops: IR config error [card=%d]\n", btv->c.type);
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err = -ENODEV;
|
goto err_out_free;
|
}
|
|
if (ir->rc5_gpio) {
|
u32 gpio;
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/* enable remote irq */
|
bttv_gpio_inout(&btv->c, (1 << 4), 1 << 4);
|
gpio = bttv_gpio_read(&btv->c);
|
bttv_gpio_write(&btv->c, gpio & ~(1 << 4));
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bttv_gpio_write(&btv->c, gpio | (1 << 4));
|
} else {
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/* init hardware-specific stuff */
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bttv_gpio_inout(&btv->c, ir->mask_keycode | ir->mask_keydown, 0);
|
}
|
|
/* init input device */
|
ir->dev = rc;
|
ir->btv = btv;
|
|
snprintf(ir->name, sizeof(ir->name), "bttv IR (card=%d)",
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btv->c.type);
|
snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0",
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pci_name(btv->c.pci));
|
|
rc->device_name = ir->name;
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rc->input_phys = ir->phys;
|
rc->input_id.bustype = BUS_PCI;
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rc->input_id.version = 1;
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if (btv->c.pci->subsystem_vendor) {
|
rc->input_id.vendor = btv->c.pci->subsystem_vendor;
|
rc->input_id.product = btv->c.pci->subsystem_device;
|
} else {
|
rc->input_id.vendor = btv->c.pci->vendor;
|
rc->input_id.product = btv->c.pci->device;
|
}
|
rc->dev.parent = &btv->c.pci->dev;
|
rc->map_name = ir_codes;
|
rc->driver_name = MODULE_NAME;
|
|
btv->remote = ir;
|
bttv_ir_start(ir);
|
|
/* all done */
|
err = rc_register_device(rc);
|
if (err)
|
goto err_out_stop;
|
|
return 0;
|
|
err_out_stop:
|
bttv_ir_stop(btv);
|
btv->remote = NULL;
|
err_out_free:
|
rc_free_device(rc);
|
kfree(ir);
|
return err;
|
}
|
|
void bttv_input_fini(struct bttv *btv)
|
{
|
if (btv->remote == NULL)
|
return;
|
|
bttv_ir_stop(btv);
|
rc_unregister_device(btv->remote->dev);
|
kfree(btv->remote);
|
btv->remote = NULL;
|
}
|
