diff options
Diffstat (limited to 'drivers/media/pci/cx23885/cx23885-input.c')
| -rw-r--r-- | drivers/media/pci/cx23885/cx23885-input.c | 365 |
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, ¶ms); + 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, ¶ms); + } + + 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, ¶ms); + } +} + +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, ¶ms); + 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, ¶ms); + 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, ¶ms); + while (params.shutdown == false) { + params.enable = false; + params.interrupt_enable = false; + params.shutdown = true; + v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); + v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); + } + 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; +} |