| /* |
| * 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@radix.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/input.h> |
| #include <media/ir-common.h> |
| #include <media/v4l2-subdev.h> |
| |
| #include "cx23885.h" |
| |
| #define RC5_BITS 14 |
| #define RC5_HALF_BITS (2*RC5_BITS) |
| #define RC5_HALF_BITS_MASK ((1 << RC5_HALF_BITS) - 1) |
| |
| #define RC5_START_BITS_NORMAL 0x3 /* Command range 0 - 63 */ |
| #define RC5_START_BITS_EXTENDED 0x2 /* Command range 64 - 127 */ |
| |
| #define RC5_EXTENDED_COMMAND_OFFSET 64 |
| |
| static inline unsigned int rc5_command(u32 rc5_baseband) |
| { |
| return RC5_INSTR(rc5_baseband) + |
| ((RC5_START(rc5_baseband) == RC5_START_BITS_EXTENDED) |
| ? RC5_EXTENDED_COMMAND_OFFSET : 0); |
| } |
| |
| static void cx23885_input_process_raw_rc5(struct cx23885_dev *dev) |
| { |
| struct card_ir *ir_input = dev->ir_input; |
| unsigned int code, command; |
| u32 rc5; |
| |
| /* Ignore codes that are too short to be valid RC-5 */ |
| if (ir_input->last_bit < (RC5_HALF_BITS - 1)) |
| return; |
| |
| /* The library has the manchester coding backwards; XOR to adapt. */ |
| code = (ir_input->code & RC5_HALF_BITS_MASK) ^ RC5_HALF_BITS_MASK; |
| rc5 = ir_rc5_decode(code); |
| |
| switch (RC5_START(rc5)) { |
| case RC5_START_BITS_NORMAL: |
| break; |
| case RC5_START_BITS_EXTENDED: |
| /* Don't allow if the remote only emits standard commands */ |
| if (ir_input->start == RC5_START_BITS_NORMAL) |
| return; |
| break; |
| default: |
| return; |
| } |
| |
| if (ir_input->addr != RC5_ADDR(rc5)) |
| return; |
| |
| /* Don't generate a keypress for RC-5 auto-repeated keypresses */ |
| command = rc5_command(rc5); |
| if (RC5_TOGGLE(rc5) != RC5_TOGGLE(ir_input->last_rc5) || |
| command != rc5_command(ir_input->last_rc5) || |
| /* Catch T == 0, CMD == 0 (e.g. '0') as first keypress after init */ |
| RC5_START(ir_input->last_rc5) == 0) { |
| /* This keypress is differnet: not an auto repeat */ |
| ir_input_nokey(ir_input->dev, &ir_input->ir); |
| ir_input_keydown(ir_input->dev, &ir_input->ir, command); |
| } |
| ir_input->last_rc5 = rc5; |
| |
| /* Schedule when we should do the key up event: ir_input_nokey() */ |
| mod_timer(&ir_input->timer_keyup, |
| jiffies + msecs_to_jiffies(ir_input->rc5_key_timeout)); |
| } |
| |
| static void cx23885_input_next_pulse_width_rc5(struct cx23885_dev *dev, |
| u32 ns_pulse) |
| { |
| const int rc5_quarterbit_ns = 444444; /* 32 cycles/36 kHz/2 = 444 us */ |
| struct card_ir *ir_input = dev->ir_input; |
| int i, level, quarterbits, halfbits; |
| |
| if (!ir_input->active) { |
| ir_input->active = 1; |
| /* assume an initial space that we may not detect or measure */ |
| ir_input->code = 0; |
| ir_input->last_bit = 0; |
| } |
| |
| if (ns_pulse == V4L2_SUBDEV_IR_PULSE_RX_SEQ_END) { |
| ir_input->last_bit++; /* Account for the final space */ |
| ir_input->active = 0; |
| cx23885_input_process_raw_rc5(dev); |
| return; |
| } |
| |
| level = (ns_pulse & V4L2_SUBDEV_IR_PULSE_LEVEL_MASK) ? 1 : 0; |
| |
| /* Skip any leading space to sync to the start bit */ |
| if (ir_input->last_bit == 0 && level == 0) |
| return; |
| |
| /* |
| * With valid RC-5 we can get up to two consecutive half-bits in a |
| * single pulse measurment. Experiments have shown that the duration |
| * of a half-bit can vary. Make sure we always end up with an even |
| * number of quarter bits at the same level (mark or space). |
| */ |
| ns_pulse &= V4L2_SUBDEV_IR_PULSE_MAX_WIDTH_NS; |
| quarterbits = ns_pulse / rc5_quarterbit_ns; |
| if (quarterbits & 1) |
| quarterbits++; |
| halfbits = quarterbits / 2; |
| |
| for (i = 0; i < halfbits; i++) { |
| ir_input->last_bit++; |
| ir_input->code |= (level << ir_input->last_bit); |
| |
| if (ir_input->last_bit >= RC5_HALF_BITS-1) { |
| ir_input->active = 0; |
| cx23885_input_process_raw_rc5(dev); |
| /* |
| * If level is 1, a leading mark is invalid for RC5. |
| * If level is 0, we scan past extra intial space. |
| * Either way we don't want to reactivate collecting |
| * marks or spaces here with any left over half-bits. |
| */ |
| break; |
| } |
| } |
| } |
| |
| static void cx23885_input_process_pulse_widths_rc5(struct cx23885_dev *dev, |
| bool add_eom) |
| { |
| struct card_ir *ir_input = dev->ir_input; |
| struct ir_input_state *ir_input_state = &ir_input->ir; |
| |
| u32 ns_pulse[RC5_HALF_BITS+1]; |
| ssize_t num = 0; |
| int count, i; |
| |
| do { |
| v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ns_pulse, |
| sizeof(ns_pulse), &num); |
| |
| count = num / sizeof(u32); |
| |
| /* Append an end of Rx seq, if the caller requested */ |
| if (add_eom && count < ARRAY_SIZE(ns_pulse)) { |
| ns_pulse[count] = V4L2_SUBDEV_IR_PULSE_RX_SEQ_END; |
| count++; |
| } |
| |
| /* Just drain the Rx FIFO, if we're called, but not RC-5 */ |
| if (ir_input_state->ir_type != IR_TYPE_RC5) |
| continue; |
| |
| for (i = 0; i < count; i++) |
| cx23885_input_next_pulse_width_rc5(dev, ns_pulse[i]); |
| } while (num != 0); |
| } |
| |
| 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_HVR1850: |
| case CX23885_BOARD_HAUPPAUGE_HVR1290: |
| /* |
| * The only board 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_pulse_widths_rc5(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 void cx23885_input_ir_start(struct cx23885_dev *dev) |
| { |
| struct card_ir *ir_input = dev->ir_input; |
| struct ir_input_state *ir_input_state = &ir_input->ir; |
| struct v4l2_subdev_ir_parameters params; |
| |
| if (dev->sd_ir == NULL) |
| return; |
| |
| atomic_set(&dev->ir_input_stopping, 0); |
| |
| /* keyup timer set up, if needed */ |
| switch (dev->board) { |
| case CX23885_BOARD_HAUPPAUGE_HVR1850: |
| case CX23885_BOARD_HAUPPAUGE_HVR1290: |
| setup_timer(&ir_input->timer_keyup, |
| ir_rc5_timer_keyup, /* Not actually RC-5 specific */ |
| (unsigned long) ir_input); |
| if (ir_input_state->ir_type == IR_TYPE_RC5) { |
| /* |
| * RC-5 repeats a held key every |
| * 64 bits * (2 * 32/36000) sec/bit = 113.778 ms |
| */ |
| ir_input->rc5_key_timeout = 115; |
| } |
| break; |
| } |
| |
| v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); |
| switch (dev->board) { |
| case CX23885_BOARD_HAUPPAUGE_HVR1850: |
| case CX23885_BOARD_HAUPPAUGE_HVR1290: |
| /* |
| * 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 = true; |
| break; |
| } |
| v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); |
| } |
| |
| static void cx23885_input_ir_stop(struct cx23885_dev *dev) |
| { |
| struct card_ir *ir_input = dev->ir_input; |
| 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_scheduled_work(); |
| |
| switch (dev->board) { |
| case CX23885_BOARD_HAUPPAUGE_HVR1850: |
| case CX23885_BOARD_HAUPPAUGE_HVR1290: |
| del_timer_sync(&ir_input->timer_keyup); |
| break; |
| } |
| } |
| |
| int cx23885_input_init(struct cx23885_dev *dev) |
| { |
| struct card_ir *ir; |
| struct input_dev *input_dev; |
| struct ir_scancode_table *ir_codes = NULL; |
| int ir_type, ir_addr, ir_start; |
| 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_HVR1850: |
| case CX23885_BOARD_HAUPPAUGE_HVR1290: |
| /* Parameters for the grey Hauppauge remote for the HVR-1850 */ |
| ir_codes = &ir_codes_hauppauge_new_table; |
| ir_type = IR_TYPE_RC5; |
| ir_addr = 0x1e; /* RC-5 system bits emitted by the remote */ |
| ir_start = RC5_START_BITS_NORMAL; /* A basic RC-5 remote */ |
| break; |
| } |
| if (ir_codes == NULL) |
| return -ENODEV; |
| |
| ir = kzalloc(sizeof(*ir), GFP_KERNEL); |
| input_dev = input_allocate_device(); |
| if (!ir || !input_dev) { |
| ret = -ENOMEM; |
| goto err_out_free; |
| } |
| |
| ir->dev = input_dev; |
| ir->addr = ir_addr; |
| ir->start = ir_start; |
| |
| /* init input device */ |
| snprintf(ir->name, sizeof(ir->name), "cx23885 IR (%s)", |
| cx23885_boards[dev->board].name); |
| snprintf(ir->phys, sizeof(ir->phys), "pci-%s/ir0", pci_name(dev->pci)); |
| |
| ret = ir_input_init(input_dev, &ir->ir, ir_type, ir_codes); |
| if (ret < 0) |
| goto err_out_free; |
| |
| input_dev->name = ir->name; |
| input_dev->phys = ir->phys; |
| input_dev->id.bustype = BUS_PCI; |
| input_dev->id.version = 1; |
| if (dev->pci->subsystem_vendor) { |
| input_dev->id.vendor = dev->pci->subsystem_vendor; |
| input_dev->id.product = dev->pci->subsystem_device; |
| } else { |
| input_dev->id.vendor = dev->pci->vendor; |
| input_dev->id.product = dev->pci->device; |
| } |
| input_dev->dev.parent = &dev->pci->dev; |
| |
| dev->ir_input = ir; |
| cx23885_input_ir_start(dev); |
| |
| ret = input_register_device(ir->dev); |
| if (ret) |
| goto err_out_stop; |
| |
| return 0; |
| |
| err_out_stop: |
| cx23885_input_ir_stop(dev); |
| dev->ir_input = NULL; |
| err_out_free: |
| ir_input_unregister(input_dev); |
| input_free_device(input_dev); |
| kfree(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->ir_input == NULL) |
| return; |
| ir_input_unregister(dev->ir_input->dev); |
| input_unregister_device(dev->ir_input->dev); |
| kfree(dev->ir_input); |
| dev->ir_input = NULL; |
| } |