From patchwork Thu Apr 1 17:56:31 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 90215 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o31HvoOk005111 for ; Thu, 1 Apr 2010 17:58:25 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758710Ab0DAR6G (ORCPT ); Thu, 1 Apr 2010 13:58:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:5399 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758079Ab0DAR55 (ORCPT ); Thu, 1 Apr 2010 13:57:57 -0400 Received: from int-mx08.intmail.prod.int.phx2.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o31HvvOb016908 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 1 Apr 2010 13:57:57 -0400 Received: from pedra (vpn-10-70.rdu.redhat.com [10.11.10.70]) by int-mx08.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o31HvftG005012 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 1 Apr 2010 13:57:55 -0400 Date: Thu, 1 Apr 2010 14:56:31 -0300 From: Mauro Carvalho Chehab To: linux-input@vger.kernel.org, Linux Media Mailing List Subject: [PATCH 09/15] V4L/DVB: ir-core: prepare to add more operations for ir decoders Message-ID: <20100401145631.21d1d40a@pedra> In-Reply-To: References: Mime-Version: 1.0 X-Scanned-By: MIMEDefang 2.67 on 10.5.11.21 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Thu, 01 Apr 2010 17:58:26 +0000 (UTC) diff --git a/drivers/media/IR/ir-nec-decoder.c b/drivers/media/IR/ir-nec-decoder.c index c9a986d..cb57cc2 100644 --- a/drivers/media/IR/ir-nec-decoder.c +++ b/drivers/media/IR/ir-nec-decoder.c @@ -178,8 +178,7 @@ err: * @input_dev: the struct input_dev descriptor of the device * @evs: event array with type/duration of pulse/space * @len: length of the array - * This function returns the number of decoded pulses or -EINVAL if no - * pulse got decoded + * This function returns the number of decoded pulses */ static int ir_nec_decode(struct input_dev *input_dev, struct ir_raw_event *evs, @@ -192,9 +191,6 @@ static int ir_nec_decode(struct input_dev *input_dev, if (__ir_nec_decode(input_dev, evs, len, &pos) > 0) rc++; } - - if (!rc) - return -EINVAL; return rc; } diff --git a/drivers/media/IR/ir-raw-event.c b/drivers/media/IR/ir-raw-event.c index 3eae128..11f23f4 100644 --- a/drivers/media/IR/ir-raw-event.c +++ b/drivers/media/IR/ir-raw-event.c @@ -14,13 +14,41 @@ #include #include +#include /* Define the max number of bit transitions per IR keycode */ #define MAX_IR_EVENT_SIZE 256 /* Used to handle IR raw handler extensions */ static LIST_HEAD(ir_raw_handler_list); -static DEFINE_MUTEX(ir_raw_handler_lock); +static spinlock_t ir_raw_handler_lock; + +/** + * RUN_DECODER() - runs an operation on all IR decoders + * @ops: IR raw handler operation to be called + * @arg: arguments to be passed to the callback + * + * Calls ir_raw_handler::ops for all registered IR handlers. It prevents + * new decode addition/removal while running, by locking ir_raw_handler_lock + * mutex. If an error occurs, it stops the ops. Otherwise, it returns a sum + * of the return codes. + */ +#define RUN_DECODER(ops, ...) ({ \ + struct ir_raw_handler *_ir_raw_handler; \ + int _sumrc = 0, _rc; \ + spin_lock(&ir_raw_handler_lock); \ + list_for_each_entry(_ir_raw_handler, &ir_raw_handler_list, list) { \ + if (_ir_raw_handler->ops) { \ + _rc = _ir_raw_handler->ops(__VA_ARGS__); \ + if (_rc < 0) \ + break; \ + _sumrc += _rc; \ + } \ + } \ + spin_unlock(&ir_raw_handler_lock); \ + _sumrc; \ +}) + /* Used to load the decoders */ static struct work_struct wq_load; @@ -38,6 +66,8 @@ int ir_raw_event_register(struct input_dev *input_dev) int rc, size; ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL); + if (!ir->raw) + return -ENOMEM; size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2; size = roundup_pow_of_two(size); @@ -48,6 +78,19 @@ int ir_raw_event_register(struct input_dev *input_dev) set_bit(EV_REP, input_dev->evbit); rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL); + if (rc < 0) { + kfree(ir->raw); + ir->raw = NULL; + return rc; + } + + rc = RUN_DECODER(raw_register, input_dev); + if (rc < 0) { + kfifo_free(&ir->raw->kfifo); + kfree(ir->raw); + ir->raw = NULL; + return rc; + } return rc; } @@ -62,6 +105,8 @@ void ir_raw_event_unregister(struct input_dev *input_dev) del_timer_sync(&ir->raw->timer_keyup); + RUN_DECODER(raw_unregister, input_dev); + kfifo_free(&ir->raw->kfifo); kfree(ir->raw); ir->raw = NULL; @@ -109,7 +154,6 @@ int ir_raw_event_handle(struct input_dev *input_dev) int rc; struct ir_raw_event *evs; int len, i; - struct ir_raw_handler *ir_raw_handler; /* * Store the events into a temporary buffer. This allows calling more than @@ -133,13 +177,10 @@ int ir_raw_event_handle(struct input_dev *input_dev) /* * Call all ir decoders. This allows decoding the same event with - * more than one protocol handler. - * FIXME: better handle the returned code: does it make sense to use - * other decoders, if the first one already handled the IR? + * more than one protocol handler. It returns the number of keystrokes + * sent to the event interface */ - list_for_each_entry(ir_raw_handler, &ir_raw_handler_list, list) { - rc = ir_raw_handler->decode(input_dev, evs, len); - } + rc = RUN_DECODER(decode, input_dev, evs, len); kfree(evs); @@ -153,18 +194,18 @@ EXPORT_SYMBOL_GPL(ir_raw_event_handle); int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler) { - mutex_lock(&ir_raw_handler_lock); + spin_lock(&ir_raw_handler_lock); list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list); - mutex_unlock(&ir_raw_handler_lock); + spin_unlock(&ir_raw_handler_lock); return 0; } EXPORT_SYMBOL(ir_raw_handler_register); void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler) { - mutex_lock(&ir_raw_handler_lock); + spin_lock(&ir_raw_handler_lock); list_del(&ir_raw_handler->list); - mutex_unlock(&ir_raw_handler_lock); + spin_unlock(&ir_raw_handler_lock); } EXPORT_SYMBOL(ir_raw_handler_unregister); @@ -181,6 +222,10 @@ static void init_decoders(struct work_struct *work) void ir_raw_init(void) { + spin_lock_init(&ir_raw_handler_lock); + +#ifdef MODULE INIT_WORK(&wq_load, init_decoders); schedule_work(&wq_load); -} \ No newline at end of file +#endif +} diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c index 38f60e4..8dd74ae 100644 --- a/drivers/media/video/saa7134/saa7134-input.c +++ b/drivers/media/video/saa7134/saa7134-input.c @@ -960,7 +960,7 @@ static int saa7134_raw_decode_irq(struct saa7134_dev *dev) saa_clearb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN); saa_setb(SAA7134_GPIO_GPMODE3, SAA7134_GPIO_GPRESCAN); pulse = saa_readl(SAA7134_GPIO_GPSTATUS0 >> 2) & ir->mask_keydown; - ir_raw_event_store(dev->remote->dev, pulse? IR_PULSE : IR_SPACE); + ir_raw_event_store(dev->remote->dev, pulse ? IR_PULSE : IR_SPACE); /* diff --git a/include/media/ir-core.h b/include/media/ir-core.h index c377bf4..c704fa7 100644 --- a/include/media/ir-core.h +++ b/include/media/ir-core.h @@ -88,6 +88,8 @@ struct ir_raw_handler { int (*decode)(struct input_dev *input_dev, struct ir_raw_event *evs, int len); + int (*raw_register)(struct input_dev *input_dev); + int (*raw_unregister)(struct input_dev *input_dev); }; #define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr) @@ -116,12 +118,7 @@ int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type); int ir_raw_event_handle(struct input_dev *input_dev); int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler); void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler); - -#ifdef MODULE void ir_raw_init(void); -#else -#define ir_raw_init() 0 -#endif /* from ir-nec-decoder.c */ #ifdef CONFIG_IR_NEC_DECODER_MODULE