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* Copyright (c) 2003 Gerd Knorr
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* Copyright (c) 2003 Pavel Machek
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#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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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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#define dprintk(fmt, ...) \
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pr_info(fmt, ##__VA_ARGS__); \
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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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struct bttv_ir *ir = btv->remote;
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gpio = bttv_gpio_read(&btv->c);
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if (ir->last_gpio == gpio)
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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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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, data, 0);
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/* HACK: Probably, ir->mask_keydown is missing
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if (btv->c.type == BTTV_BOARD_WINFAST2000)
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rc_keydown_notimeout(ir->dev, data, 0);
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static void ir_enltv_handle_key(struct bttv *btv)
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struct bttv_ir *ir = btv->remote;
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u32 gpio, data, keyup;
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gpio = bttv_gpio_read(&btv->c);
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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) ? 1 << 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 & ir->mask_keyup) ? " up" : "up/down");
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rc_keydown_notimeout(ir->dev, data, 0);
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if ((ir->last_gpio & 1 << 31) == keyup)
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dprintk("(cnt) gpio=0x%x code=%d | %s\n",
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(gpio & ir->mask_keyup) ? " up" : "down");
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rc_keydown_notimeout(ir->dev, data, 0);
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ir->last_gpio = data | keyup;
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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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struct bttv_ir *ir = btv->remote;
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else if (!ir->polling)
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static void bttv_input_timer(unsigned long data)
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struct bttv *btv = (struct bttv*)data;
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struct bttv_ir *ir = btv->remote;
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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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mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling));
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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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#define RC5_START(x) (((x) >> 12) & 3)
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#define RC5_TOGGLE(x) (((x) >> 11) & 1)
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#define RC5_ADDR(x) (((x) >> 6) & 31)
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#define RC5_INSTR(x) ((x) & 63)
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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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unsigned int org_code = code;
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unsigned int rc5 = 0;
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for (i = 0; i < 14; ++i) {
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dprintk("rc5_decode(%x) bad code\n",
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dprintk("code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
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"instr=%x\n", rc5, org_code, RC5_START(rc5),
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RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
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static void bttv_rc5_timer_end(unsigned long data)
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struct bttv_ir *ir = (struct bttv_ir *)data;
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do_gettimeofday(&tv);
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/* avoid overflow with gap >1s */
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if (tv.tv_sec - ir->base_time.tv_sec > 1) {
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gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
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tv.tv_usec - ir->base_time.tv_usec;
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/* signal we're ready to start a new code */
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/* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
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dprintk("spurious timer_end\n");
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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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ir->code = (ir->code << ir->shift_by) | 1;
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rc5 = bttv_rc5_decode(ir->code);
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/* two start bits? */
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if (RC5_START(rc5) != ir->start) {
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" rc5 start bits invalid: %u\n", RC5_START(rc5));
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} else if (RC5_ADDR(rc5) == ir->addr) {
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u32 toggle = RC5_TOGGLE(rc5);
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u32 instr = RC5_INSTR(rc5);
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rc_keydown(ir->dev, instr, toggle);
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dprintk("instruction %x, toggle %x\n",
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static int bttv_rc5_irq(struct bttv *btv)
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struct bttv_ir *ir = btv->remote;
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unsigned long current_jiffies;
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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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do_gettimeofday(&tv);
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/* avoid overflow with gap >1s */
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if (tv.tv_sec - ir->base_time.tv_sec > 1) {
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gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
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tv.tv_usec - ir->base_time.tv_usec;
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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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/* active code => add bit */
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/* only if in the code (otherwise spurious IRQ or timer
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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->code |= 1 << ir->last_bit;
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/* starting new code */
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mod_timer(&ir->timer, current_jiffies + msecs_to_jiffies(30));
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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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/* ---------------------------------------------------------------------- */
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static void bttv_ir_start(struct bttv *btv, struct bttv_ir *ir)
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setup_timer(&ir->timer, bttv_input_timer, (unsigned long)btv);
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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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setup_timer(&ir->timer, bttv_rc5_timer_end, (unsigned long)ir);
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ir->rc5_remote_gap = ir_rc5_remote_gap;
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static void bttv_ir_stop(struct bttv *btv)
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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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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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* Get_key functions used by I2C remotes
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static int get_key_pv951(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
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if (1 != i2c_master_recv(ir->c, &b, 1)) {
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dprintk("read error\n");
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dprintk("key %02x\n", b);
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* lirc_i2c maps the pv951 code as:
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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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/* Instantiate the I2C IR receiver device, if present */
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void __devinit init_bttv_i2c_ir(struct bttv *btv)
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const unsigned short addr_list[] = {
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0x1a, 0x18, 0x64, 0x30, 0x71,
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struct i2c_board_info info;
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if (0 != btv->i2c_rc)
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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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strlcpy(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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* 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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* That's why we probe 0x1a (~0x34) first. CB
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i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list, NULL);
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if (btv->init_data.name)
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info.platform_data = &btv->init_data;
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i2c_new_device(&btv->c.i2c_adap, &info);
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int __devexit fini_bttv_i2c(struct bttv *btv)
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if (0 != btv->i2c_rc)
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return i2c_del_adapter(&btv->c.i2c_adap);
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int bttv_input_init(struct bttv *btv)
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char *ir_codes = NULL;
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if (!btv->has_remote)
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ir = kzalloc(sizeof(*ir),GFP_KERNEL);
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rc = rc_allocate_device();
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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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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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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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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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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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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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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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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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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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case BTTV_BOARD_NEBULA_DIGITV:
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ir_codes = RC_MAP_NEBULA;
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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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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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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),
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if (NULL == ir_codes) {
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dprintk("Ooops: IR config error [card=%d]\n", btv->c.type);
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/* enable remote irq */
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bttv_gpio_inout(&btv->c, (1 << 4), 1 << 4);
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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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bttv_gpio_write(&btv->c, gpio | (1 << 4));
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/* init hardware-specific stuff */
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bttv_gpio_inout(&btv->c, ir->mask_keycode | ir->mask_keydown, 0);
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/* init input device */
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snprintf(ir->name, sizeof(ir->name), "bttv IR (card=%d)",
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snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0",
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pci_name(btv->c.pci));
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rc->input_name = ir->name;
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rc->input_phys = ir->phys;
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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) {
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rc->input_id.vendor = btv->c.pci->subsystem_vendor;
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rc->input_id.product = btv->c.pci->subsystem_device;
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rc->input_id.vendor = btv->c.pci->vendor;
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rc->input_id.product = btv->c.pci->device;
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rc->dev.parent = &btv->c.pci->dev;
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rc->map_name = ir_codes;
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rc->driver_name = MODULE_NAME;
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bttv_ir_start(btv, ir);
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err = rc_register_device(rc);
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void bttv_input_fini(struct bttv *btv)
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if (btv->remote == NULL)
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rc_unregister_device(btv->remote->dev);