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V4L/DVB (8625): saa7134: Add NEC prococol IR decoding capability
This patch adds the capability of decoding NEC protocol, received via GPIO18 line. This GPIO port can trigger saa7134 IRQ. A future improvement would be to make it a little more generic to work also with GPIO16 line. A pure IRQ code didn't work, since some delays were introduced on the tests we did. A possible approach would be to use polling at a rate of 2.5 ms or less. If a new code were taken, a code similar to nec_task() could be used. However, this would add an extra overhead to kernel, and will consume more power. Due to that, we took an hybrid approach: an IRQ upper half to trigger when a new key is received and a bottom half to convert pulse-distance into a keycode. The bottom half is polling based, to improve performance. During the bottom half proccess, GPIO18 IRQ line is disabled, preventing IRQ reentrancy and improving performance a little bit. Thanks to Sistema Fenix (http://www.sistemafenix.com.br/) for sponsoring this development. Signed-off-by: Gilberto <gilberto@sistemafenix.com.br> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab
Mauro Carvalho Chehab
parent
d56dc61265
commit
622ecb3003
2 changed files with 139 additions and 6 deletions
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@ -62,8 +62,11 @@ MODULE_PARM_DESC(disable_other_ir, "disable full codes of "
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#define i2cdprintk(fmt, arg...) if (ir_debug) \
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printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg)
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/** rc5 functions */
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/* Helper functions for RC5 and NEC decoding at GPIO16 or GPIO18 */
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static int saa7134_rc5_irq(struct saa7134_dev *dev);
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static int saa7134_nec_irq(struct saa7134_dev *dev);
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static void nec_task(unsigned long data);
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static void saa7134_nec_timer(unsigned long data);
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/* -------------------- GPIO generic keycode builder -------------------- */
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@ -280,7 +283,9 @@ void saa7134_input_irq(struct saa7134_dev *dev)
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{
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struct card_ir *ir = dev->remote;
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if (!ir->polling && !ir->rc5_gpio) {
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if (ir->nec_gpio) {
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saa7134_nec_irq(dev);
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} else if (!ir->polling && !ir->rc5_gpio) {
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build_key(dev);
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} else if (ir->rc5_gpio) {
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saa7134_rc5_irq(dev);
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@ -316,6 +321,10 @@ void saa7134_ir_start(struct saa7134_dev *dev, struct card_ir *ir)
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ir->addr = 0x17;
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ir->rc5_key_timeout = ir_rc5_key_timeout;
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ir->rc5_remote_gap = ir_rc5_remote_gap;
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} else if (ir->nec_gpio) {
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setup_timer(&ir->timer_keyup, saa7134_nec_timer,
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(unsigned long)dev);
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tasklet_init(&ir->tlet, nec_task, (unsigned long)dev);
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}
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}
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@ -335,6 +344,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
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u32 mask_keyup = 0;
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int polling = 0;
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int rc5_gpio = 0;
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int nec_gpio = 0;
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int ir_type = IR_TYPE_OTHER;
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int err;
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@ -533,6 +543,7 @@ int saa7134_input_init1(struct saa7134_dev *dev)
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ir->mask_keyup = mask_keyup;
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ir->polling = polling;
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ir->rc5_gpio = rc5_gpio;
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ir->nec_gpio = nec_gpio;
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/* init input device */
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snprintf(ir->name, sizeof(ir->name), "saa7134 IR (%s)",
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@ -675,8 +686,125 @@ static int saa7134_rc5_irq(struct saa7134_dev *dev)
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return 1;
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}
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/* ----------------------------------------------------------------------
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* Local variables:
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* c-basic-offset: 8
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* End:
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/* On NEC protocol, One has 2.25 ms, and zero has 1.125 ms
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The first pulse (start) has 9 + 4.5 ms
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*/
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static void saa7134_nec_timer(unsigned long data)
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{
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struct saa7134_dev *dev = (struct saa7134_dev *) data;
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struct card_ir *ir = dev->remote;
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dprintk("Cancel key repeat\n");
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ir_input_nokey(ir->dev, &ir->ir);
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}
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static void nec_task(unsigned long data)
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{
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struct saa7134_dev *dev = (struct saa7134_dev *) data;
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struct card_ir *ir;
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struct timeval tv;
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int count, pulse, oldpulse, gap;
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u32 ircode = 0, not_code = 0;
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int ngap = 0;
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if (!data) {
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printk(KERN_ERR "saa713x/ir: Can't recover dev struct\n");
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/* GPIO will be kept disabled */
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return;
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}
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ir = dev->remote;
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/* rising SAA7134_GPIO_GPRESCAN reads the status */
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saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
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saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
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oldpulse = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & ir->mask_keydown;
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pulse = oldpulse;
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do_gettimeofday(&tv);
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ir->base_time = tv;
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/* Decode NEC pulsecode. This code can take up to 76.5 ms to run.
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Unfortunately, using IRQ to decode pulse didn't work, since it uses
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a pulse train of 38KHz. This means one pulse on each 52 us
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*/
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do {
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/* Wait until the end of pulse/space or 5 ms */
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for (count = 0; count < 500; count++) {
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udelay(10);
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/* rising SAA7134_GPIO_GPRESCAN reads the status */
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saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
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saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN);
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pulse = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2)
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& ir->mask_keydown;
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if (pulse != oldpulse)
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break;
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}
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do_gettimeofday(&tv);
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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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if (!pulse) {
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/* Bit 0 has 560 us, while bit 1 has 1120 us.
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Do something only if bit == 1
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*/
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if (ngap && (gap > 560 + 280)) {
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unsigned int shift = ngap - 1;
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/* Address first, then command */
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if (shift < 8) {
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shift += 8;
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ircode |= 1 << shift;
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} else if (shift < 16) {
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not_code |= 1 << shift;
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} else if (shift < 24) {
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shift -= 16;
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ircode |= 1 << shift;
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} else {
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shift -= 24;
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not_code |= 1 << shift;
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}
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}
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ngap++;
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}
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ir->base_time = tv;
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/* TIMEOUT - Long pulse */
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if (gap >= 5000)
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break;
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oldpulse = pulse;
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} while (ngap < 32);
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if (ngap == 32) {
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/* FIXME: should check if not_code == ~ircode */
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ir->code = ir_extract_bits(ircode, ir->mask_keycode);
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dprintk("scancode = 0x%02x (code = 0x%02x, notcode= 0x%02x)\n",
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ir->code, ircode, not_code);
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ir_input_keydown(ir->dev, &ir->ir, ir->code, ir->code);
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} else
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dprintk("Repeat last key\n");
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/* Keep repeating the last key */
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mod_timer(&ir->timer_keyup, jiffies + msecs_to_jiffies(150));
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saa_setl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18);
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}
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static int saa7134_nec_irq(struct saa7134_dev *dev)
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{
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struct card_ir *ir = dev->remote;
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saa_clearl(SAA7134_IRQ2, SAA7134_IRQ2_INTE_GPIO18);
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tasklet_schedule(&ir->tlet);
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return 1;
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}
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@ -25,6 +25,7 @@
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/interrupt.h>
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#define IR_TYPE_RC5 1
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#define IR_TYPE_PD 2 /* Pulse distance encoded IR */
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@ -85,6 +86,10 @@ struct card_ir {
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u32 code; /* raw code under construction */
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struct timeval base_time; /* time of last seen code */
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int active; /* building raw code */
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/* NEC decoding */
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u32 nec_gpio;
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struct tasklet_struct tlet;
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};
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void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
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