1 files changed, 356 insertions, 0 deletions

diff --git a/drivers/media/video/cx23885/cx23885-input.c b/drivers/media/video/cx23885/cx23885-input.c
new file mode 100644
index 00000000000..ce765e3f77b
--- /dev/null
+++ b/drivers/media/video/cx23885/cx23885-input.c
@@ -0,0 +1,356 @@
+/*
+ *  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_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_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_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;
+}