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Diffstat (limited to 'drivers/media/IR/ir-functions.c')
-rw-r--r--drivers/media/IR/ir-functions.c373
1 files changed, 373 insertions, 0 deletions
diff --git a/drivers/media/IR/ir-functions.c b/drivers/media/IR/ir-functions.c
new file mode 100644
index 000000000000..e616f624ceaa
--- /dev/null
+++ b/drivers/media/IR/ir-functions.c
@@ -0,0 +1,373 @@
+/*
+ *
+ * some common structs and functions to handle infrared remotes via
+ * input layer ...
+ *
+ * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/jiffies.h>
+#include <media/ir-common.h>
+
+/* -------------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
+MODULE_LICENSE("GPL");
+
+static int repeat = 1;
+module_param(repeat, int, 0444);
+MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");
+
+int media_ir_debug; /* media_ir_debug level (0,1,2) */
+module_param_named(debug, media_ir_debug, int, 0644);
+
+/* -------------------------------------------------------------------------- */
+
+static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
+{
+ if (KEY_RESERVED == ir->keycode) {
+ printk(KERN_INFO "%s: unknown key: key=0x%02x down=%d\n",
+ dev->name, ir->ir_key, ir->keypressed);
+ return;
+ }
+ IR_dprintk(1,"%s: key event code=%d down=%d\n",
+ dev->name,ir->keycode,ir->keypressed);
+ input_report_key(dev,ir->keycode,ir->keypressed);
+ input_sync(dev);
+}
+
+/* -------------------------------------------------------------------------- */
+
+int ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
+ int ir_type, struct ir_scancode_table *ir_codes)
+{
+ ir->ir_type = ir_type;
+
+ ir->keytable.size = ir_roundup_tablesize(ir_codes->size);
+ ir->keytable.scan = kzalloc(ir->keytable.size *
+ sizeof(struct ir_scancode), GFP_KERNEL);
+ if (!ir->keytable.scan)
+ return -ENOMEM;
+
+ IR_dprintk(1, "Allocated space for %d keycode entries (%zd bytes)\n",
+ ir->keytable.size,
+ ir->keytable.size * sizeof(ir->keytable.scan));
+
+ ir_copy_table(&ir->keytable, ir_codes);
+ ir_set_keycode_table(dev, &ir->keytable);
+
+ clear_bit(0, dev->keybit);
+ set_bit(EV_KEY, dev->evbit);
+ if (repeat)
+ set_bit(EV_REP, dev->evbit);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ir_input_init);
+
+
+void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
+{
+ if (ir->keypressed) {
+ ir->keypressed = 0;
+ ir_input_key_event(dev,ir);
+ }
+}
+EXPORT_SYMBOL_GPL(ir_input_nokey);
+
+void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
+ u32 ir_key)
+{
+ u32 keycode = ir_g_keycode_from_table(dev, ir_key);
+
+ if (ir->keypressed && ir->keycode != keycode) {
+ ir->keypressed = 0;
+ ir_input_key_event(dev,ir);
+ }
+ if (!ir->keypressed) {
+ ir->ir_key = ir_key;
+ ir->keycode = keycode;
+ ir->keypressed = 1;
+ ir_input_key_event(dev,ir);
+ }
+}
+EXPORT_SYMBOL_GPL(ir_input_keydown);
+
+/* -------------------------------------------------------------------------- */
+/* extract mask bits out of data and pack them into the result */
+u32 ir_extract_bits(u32 data, u32 mask)
+{
+ u32 vbit = 1, value = 0;
+
+ do {
+ if (mask&1) {
+ if (data&1)
+ value |= vbit;
+ vbit<<=1;
+ }
+ data>>=1;
+ } while (mask>>=1);
+
+ return value;
+}
+EXPORT_SYMBOL_GPL(ir_extract_bits);
+
+static int inline getbit(u32 *samples, int bit)
+{
+ return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
+}
+
+/* sump raw samples for visual debugging ;) */
+int ir_dump_samples(u32 *samples, int count)
+{
+ int i, bit, start;
+
+ printk(KERN_DEBUG "ir samples: ");
+ start = 0;
+ for (i = 0; i < count * 32; i++) {
+ bit = getbit(samples,i);
+ if (bit)
+ start = 1;
+ if (0 == start)
+ continue;
+ printk("%s", bit ? "#" : "_");
+ }
+ printk("\n");
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ir_dump_samples);
+
+/* decode raw samples, pulse distance coding used by NEC remotes */
+int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
+{
+ int i,last,bit,len;
+ u32 curBit;
+ u32 value;
+
+ /* find start burst */
+ for (i = len = 0; i < count * 32; i++) {
+ bit = getbit(samples,i);
+ if (bit) {
+ len++;
+ } else {
+ if (len >= 29)
+ break;
+ len = 0;
+ }
+ }
+
+ /* start burst to short */
+ if (len < 29)
+ return 0xffffffff;
+
+ /* find start silence */
+ for (len = 0; i < count * 32; i++) {
+ bit = getbit(samples,i);
+ if (bit) {
+ break;
+ } else {
+ len++;
+ }
+ }
+
+ /* silence to short */
+ if (len < 7)
+ return 0xffffffff;
+
+ /* go decoding */
+ len = 0;
+ last = 1;
+ value = 0; curBit = 1;
+ for (; i < count * 32; i++) {
+ bit = getbit(samples,i);
+ if (last) {
+ if(bit) {
+ continue;
+ } else {
+ len = 1;
+ }
+ } else {
+ if (bit) {
+ if (len > (low + high) /2)
+ value |= curBit;
+ curBit <<= 1;
+ if (curBit == 1)
+ break;
+ } else {
+ len++;
+ }
+ }
+ last = bit;
+ }
+
+ return value;
+}
+EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
+
+/* decode raw samples, biphase coding, used by rc5 for example */
+int ir_decode_biphase(u32 *samples, int count, int low, int high)
+{
+ int i,last,bit,len,flips;
+ u32 value;
+
+ /* find start bit (1) */
+ for (i = 0; i < 32; i++) {
+ bit = getbit(samples,i);
+ if (bit)
+ break;
+ }
+
+ /* go decoding */
+ len = 0;
+ flips = 0;
+ value = 1;
+ for (; i < count * 32; i++) {
+ if (len > high)
+ break;
+ if (flips > 1)
+ break;
+ last = bit;
+ bit = getbit(samples,i);
+ if (last == bit) {
+ len++;
+ continue;
+ }
+ if (len < low) {
+ len++;
+ flips++;
+ continue;
+ }
+ value <<= 1;
+ value |= bit;
+ flips = 0;
+ len = 1;
+ }
+ return value;
+}
+EXPORT_SYMBOL_GPL(ir_decode_biphase);
+
+/* RC5 decoding stuff, moved from bttv-input.c to share it with
+ * saa7134 */
+
+/* decode raw bit pattern to RC5 code */
+u32 ir_rc5_decode(unsigned int code)
+{
+ unsigned int org_code = code;
+ unsigned int pair;
+ unsigned int rc5 = 0;
+ int i;
+
+ for (i = 0; i < 14; ++i) {
+ pair = code & 0x3;
+ code >>= 2;
+
+ rc5 <<= 1;
+ switch (pair) {
+ case 0:
+ case 2:
+ break;
+ case 1:
+ rc5 |= 1;
+ break;
+ case 3:
+ IR_dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
+ return 0;
+ }
+ }
+ IR_dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
+ "instr=%x\n", rc5, org_code, RC5_START(rc5),
+ RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
+ return rc5;
+}
+EXPORT_SYMBOL_GPL(ir_rc5_decode);
+
+void ir_rc5_timer_end(unsigned long data)
+{
+ struct card_ir *ir = (struct card_ir *)data;
+ struct timeval tv;
+ unsigned long current_jiffies, timeout;
+ u32 gap;
+ u32 rc5 = 0;
+
+ /* get time */
+ current_jiffies = jiffies;
+ do_gettimeofday(&tv);
+
+ /* avoid overflow with gap >1s */
+ if (tv.tv_sec - ir->base_time.tv_sec > 1) {
+ gap = 200000;
+ } else {
+ gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
+ tv.tv_usec - ir->base_time.tv_usec;
+ }
+
+ /* signal we're ready to start a new code */
+ ir->active = 0;
+
+ /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
+ if (gap < 28000) {
+ IR_dprintk(1, "ir-common: spurious timer_end\n");
+ return;
+ }
+
+ if (ir->last_bit < 20) {
+ /* ignore spurious codes (caused by light/other remotes) */
+ IR_dprintk(1, "ir-common: short code: %x\n", ir->code);
+ } else {
+ ir->code = (ir->code << ir->shift_by) | 1;
+ rc5 = ir_rc5_decode(ir->code);
+
+ /* two start bits? */
+ if (RC5_START(rc5) != ir->start) {
+ IR_dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
+
+ /* right address? */
+ } else if (RC5_ADDR(rc5) == ir->addr) {
+ u32 toggle = RC5_TOGGLE(rc5);
+ u32 instr = RC5_INSTR(rc5);
+
+ /* Good code, decide if repeat/repress */
+ if (toggle != RC5_TOGGLE(ir->last_rc5) ||
+ instr != RC5_INSTR(ir->last_rc5)) {
+ IR_dprintk(1, "ir-common: instruction %x, toggle %x\n", instr,
+ toggle);
+ ir_input_nokey(ir->dev, &ir->ir);
+ ir_input_keydown(ir->dev, &ir->ir, instr);
+ }
+
+ /* Set/reset key-up timer */
+ timeout = current_jiffies +
+ msecs_to_jiffies(ir->rc5_key_timeout);
+ mod_timer(&ir->timer_keyup, timeout);
+
+ /* Save code for repeat test */
+ ir->last_rc5 = rc5;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(ir_rc5_timer_end);
+
+void ir_rc5_timer_keyup(unsigned long data)
+{
+ struct card_ir *ir = (struct card_ir *)data;
+
+ IR_dprintk(1, "ir-common: key released\n");
+ ir_input_nokey(ir->dev, &ir->ir);
+}
+EXPORT_SYMBOL_GPL(ir_rc5_timer_keyup);

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