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path: root/drivers/media/pci/cx23885/cx23885-input.c
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Diffstat (limited to 'drivers/media/pci/cx23885/cx23885-input.c')
-rw-r--r--drivers/media/pci/cx23885/cx23885-input.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/drivers/media/pci/cx23885/cx23885-input.c b/drivers/media/pci/cx23885/cx23885-input.c
new file mode 100644
index 000000000000..56066721edc1
--- /dev/null
+++ b/drivers/media/pci/cx23885/cx23885-input.c
@@ -0,0 +1,365 @@
+/*
+ * Driver for the Conexant CX23885/7/8 PCIe bridge
+ *
+ * Infrared remote control input device
+ *
+ * Most of this file is
+ *
+ * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
+ *
+ * However, the cx23885_input_{init,fini} functions contained herein are
+ * derived from Linux kernel files linux/media/video/.../...-input.c marked as:
+ *
+ * Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+ * Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
+ * Markus Rechberger <mrechberger@gmail.com>
+ * Mauro Carvalho Chehab <mchehab@infradead.org>
+ * Sascha Sommer <saschasommer@freenet.de>
+ * Copyright (C) 2004, 2005 Chris Pascoe
+ * Copyright (C) 2003, 2004 Gerd Knorr
+ * Copyright (C) 2003 Pavel Machek
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/slab.h>
+#include <media/rc-core.h>
+#include <media/v4l2-subdev.h>
+
+#include "cx23885.h"
+
+#define MODULE_NAME "cx23885"
+
+static void cx23885_input_process_measurements(struct cx23885_dev *dev,
+ bool overrun)
+{
+ struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;
+
+ ssize_t num;
+ int count, i;
+ bool handle = false;
+ struct ir_raw_event ir_core_event[64];
+
+ do {
+ num = 0;
+ v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
+ sizeof(ir_core_event), &num);
+
+ count = num / sizeof(struct ir_raw_event);
+
+ for (i = 0; i < count; i++) {
+ ir_raw_event_store(kernel_ir->rc,
+ &ir_core_event[i]);
+ handle = true;
+ }
+ } while (num != 0);
+
+ if (overrun)
+ ir_raw_event_reset(kernel_ir->rc);
+ else if (handle)
+ ir_raw_event_handle(kernel_ir->rc);
+}
+
+void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
+{
+ struct v4l2_subdev_ir_parameters params;
+ int overrun, data_available;
+
+ if (dev->sd_ir == NULL || events == 0)
+ return;
+
+ switch (dev->board) {
+ case CX23885_BOARD_HAUPPAUGE_HVR1270:
+ case CX23885_BOARD_HAUPPAUGE_HVR1850:
+ case CX23885_BOARD_HAUPPAUGE_HVR1290:
+ case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
+ case CX23885_BOARD_TEVII_S470:
+ case CX23885_BOARD_HAUPPAUGE_HVR1250:
+ /*
+ * The only boards we handle right now. However other boards
+ * using the CX2388x integrated IR controller should be similar
+ */
+ break;
+ default:
+ return;
+ }
+
+ overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
+ V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
+
+ data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
+ V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
+
+ if (overrun) {
+ /* If there was a FIFO overrun, stop the device */
+ v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
+ params.enable = false;
+ /* Mitigate race with cx23885_input_ir_stop() */
+ params.shutdown = atomic_read(&dev->ir_input_stopping);
+ v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
+ }
+
+ if (data_available)
+ cx23885_input_process_measurements(dev, overrun);
+
+ if (overrun) {
+ /* If there was a FIFO overrun, clear & restart the device */
+ params.enable = true;
+ /* Mitigate race with cx23885_input_ir_stop() */
+ params.shutdown = atomic_read(&dev->ir_input_stopping);
+ v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
+ }
+}
+
+static int cx23885_input_ir_start(struct cx23885_dev *dev)
+{
+ struct v4l2_subdev_ir_parameters params;
+
+ if (dev->sd_ir == NULL)
+ return -ENODEV;
+
+ atomic_set(&dev->ir_input_stopping, 0);
+
+ v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
+ switch (dev->board) {
+ case CX23885_BOARD_HAUPPAUGE_HVR1270:
+ case CX23885_BOARD_HAUPPAUGE_HVR1850:
+ case CX23885_BOARD_HAUPPAUGE_HVR1290:
+ case CX23885_BOARD_HAUPPAUGE_HVR1250:
+ /*
+ * The IR controller on this board only returns pulse widths.
+ * Any other mode setting will fail to set up the device.
+ */
+ params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
+ params.enable = true;
+ params.interrupt_enable = true;
+ params.shutdown = false;
+
+ /* Setup for baseband compatible with both RC-5 and RC-6A */
+ params.modulation = false;
+ /* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
+ /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
+ params.max_pulse_width = 3333333; /* ns */
+ /* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
+ /* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
+ params.noise_filter_min_width = 333333; /* ns */
+ /*
+ * This board has inverted receive sense:
+ * mark is received as low logic level;
+ * falling edges are detected as rising edges; etc.
+ */
+ params.invert_level = true;
+ break;
+ case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
+ case CX23885_BOARD_TEVII_S470:
+ /*
+ * The IR controller on this board only returns pulse widths.
+ * Any other mode setting will fail to set up the device.
+ */
+ params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
+ params.enable = true;
+ params.interrupt_enable = true;
+ params.shutdown = false;
+
+ /* Setup for a standard NEC protocol */
+ params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
+ params.carrier_range_lower = 33000; /* Hz */
+ params.carrier_range_upper = 43000; /* Hz */
+ params.duty_cycle = 33; /* percent, 33 percent for NEC */
+
+ /*
+ * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
+ * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
+ */
+ params.max_pulse_width = 12378022; /* ns */
+
+ /*
+ * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
+ * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
+ */
+ params.noise_filter_min_width = 351648; /* ns */
+
+ params.modulation = false;
+ params.invert_level = true;
+ break;
+ }
+ v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
+ return 0;
+}
+
+static int cx23885_input_ir_open(struct rc_dev *rc)
+{
+ struct cx23885_kernel_ir *kernel_ir = rc->priv;
+
+ if (kernel_ir->cx == NULL)
+ return -ENODEV;
+
+ return cx23885_input_ir_start(kernel_ir->cx);
+}
+
+static void cx23885_input_ir_stop(struct cx23885_dev *dev)
+{
+ struct v4l2_subdev_ir_parameters params;
+
+ if (dev->sd_ir == NULL)
+ return;
+
+ /*
+ * Stop the sd_ir subdevice from generating notifications and
+ * scheduling work.
+ * It is shutdown this way in order to mitigate a race with
+ * cx23885_input_rx_work_handler() in the overrun case, which could
+ * re-enable the subdevice.
+ */
+ atomic_set(&dev->ir_input_stopping, 1);
+ v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
+ while (params.shutdown == false) {
+ params.enable = false;
+ params.interrupt_enable = false;
+ params.shutdown = true;
+ v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
+ v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
+ }
+ flush_work_sync(&dev->cx25840_work);
+ flush_work_sync(&dev->ir_rx_work);
+ flush_work_sync(&dev->ir_tx_work);
+}
+
+static void cx23885_input_ir_close(struct rc_dev *rc)
+{
+ struct cx23885_kernel_ir *kernel_ir = rc->priv;
+
+ if (kernel_ir->cx != NULL)
+ cx23885_input_ir_stop(kernel_ir->cx);
+}
+
+int cx23885_input_init(struct cx23885_dev *dev)
+{
+ struct cx23885_kernel_ir *kernel_ir;
+ struct rc_dev *rc;
+ char *rc_map;
+ enum rc_driver_type driver_type;
+ unsigned long allowed_protos;
+
+ int ret;
+
+ /*
+ * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
+ * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
+ */
+ if (dev->sd_ir == NULL)
+ return -ENODEV;
+
+ switch (dev->board) {
+ case CX23885_BOARD_HAUPPAUGE_HVR1270:
+ case CX23885_BOARD_HAUPPAUGE_HVR1850:
+ case CX23885_BOARD_HAUPPAUGE_HVR1290:
+ case CX23885_BOARD_HAUPPAUGE_HVR1250:
+ /* Integrated CX2388[58] IR controller */
+ driver_type = RC_DRIVER_IR_RAW;
+ allowed_protos = RC_TYPE_ALL;
+ /* The grey Hauppauge RC-5 remote */
+ rc_map = RC_MAP_HAUPPAUGE;
+ break;
+ case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
+ /* Integrated CX23885 IR controller */
+ driver_type = RC_DRIVER_IR_RAW;
+ allowed_protos = RC_TYPE_NEC;
+ /* The grey Terratec remote with orange buttons */
+ rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
+ break;
+ case CX23885_BOARD_TEVII_S470:
+ /* Integrated CX23885 IR controller */
+ driver_type = RC_DRIVER_IR_RAW;
+ allowed_protos = RC_TYPE_ALL;
+ /* A guess at the remote */
+ rc_map = RC_MAP_TEVII_NEC;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ /* cx23885 board instance kernel IR state */
+ kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
+ if (kernel_ir == NULL)
+ return -ENOMEM;
+
+ kernel_ir->cx = dev;
+ kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
+ cx23885_boards[dev->board].name);
+ kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
+ pci_name(dev->pci));
+
+ /* input device */
+ rc = rc_allocate_device();
+ if (!rc) {
+ ret = -ENOMEM;
+ goto err_out_free;
+ }
+
+ kernel_ir->rc = rc;
+ rc->input_name = kernel_ir->name;
+ rc->input_phys = kernel_ir->phys;
+ rc->input_id.bustype = BUS_PCI;
+ rc->input_id.version = 1;
+ if (dev->pci->subsystem_vendor) {
+ rc->input_id.vendor = dev->pci->subsystem_vendor;
+ rc->input_id.product = dev->pci->subsystem_device;
+ } else {
+ rc->input_id.vendor = dev->pci->vendor;
+ rc->input_id.product = dev->pci->device;
+ }
+ rc->dev.parent = &dev->pci->dev;
+ rc->driver_type = driver_type;
+ rc->allowed_protos = allowed_protos;
+ rc->priv = kernel_ir;
+ rc->open = cx23885_input_ir_open;
+ rc->close = cx23885_input_ir_close;
+ rc->map_name = rc_map;
+ rc->driver_name = MODULE_NAME;
+
+ /* Go */
+ dev->kernel_ir = kernel_ir;
+ ret = rc_register_device(rc);
+ if (ret)
+ goto err_out_stop;
+
+ return 0;
+
+err_out_stop:
+ cx23885_input_ir_stop(dev);
+ dev->kernel_ir = NULL;
+ rc_free_device(rc);
+err_out_free:
+ kfree(kernel_ir->phys);
+ kfree(kernel_ir->name);
+ kfree(kernel_ir);
+ return ret;
+}
+
+void cx23885_input_fini(struct cx23885_dev *dev)
+{
+ /* Always stop the IR hardware from generating interrupts */
+ cx23885_input_ir_stop(dev);
+
+ if (dev->kernel_ir == NULL)
+ return;
+ rc_unregister_device(dev->kernel_ir->rc);
+ kfree(dev->kernel_ir->phys);
+ kfree(dev->kernel_ir->name);
+ kfree(dev->kernel_ir);
+ dev->kernel_ir = NULL;
+}