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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for the Conexant CX23885/7/8 PCIe bridge4 *5 * Infrared remote control input device6 *7 * Most of this file is8 *9 * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>10 *11 * However, the cx23885_input_{init,fini} functions contained herein are12 * derived from Linux kernel files linux/media/video/.../...-input.c marked as:13 *14 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com>15 * Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>16 * Markus Rechberger <mrechberger@gmail.com>17 * Mauro Carvalho Chehab <mchehab@kernel.org>18 * Sascha Sommer <saschasommer@freenet.de>19 * Copyright (C) 2004, 2005 Chris Pascoe20 * Copyright (C) 2003, 2004 Gerd Knorr21 * Copyright (C) 2003 Pavel Machek22 */23 24#include "cx23885.h"25#include "cx23885-input.h"26 27#include <linux/slab.h>28#include <media/rc-core.h>29#include <media/v4l2-subdev.h>30 31#define MODULE_NAME "cx23885"32 33static void cx23885_input_process_measurements(struct cx23885_dev *dev,34 bool overrun)35{36 struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;37 38 ssize_t num;39 int count, i;40 bool handle = false;41 struct ir_raw_event ir_core_event[64];42 43 do {44 num = 0;45 v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,46 sizeof(ir_core_event), &num);47 48 count = num / sizeof(struct ir_raw_event);49 50 for (i = 0; i < count; i++) {51 ir_raw_event_store(kernel_ir->rc,52 &ir_core_event[i]);53 handle = true;54 }55 } while (num != 0);56 57 if (overrun)58 ir_raw_event_overflow(kernel_ir->rc);59 else if (handle)60 ir_raw_event_handle(kernel_ir->rc);61}62 63void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)64{65 struct v4l2_subdev_ir_parameters params;66 int overrun, data_available;67 68 if (dev->sd_ir == NULL || events == 0)69 return;70 71 switch (dev->board) {72 case CX23885_BOARD_HAUPPAUGE_HVR1270:73 case CX23885_BOARD_HAUPPAUGE_HVR1850:74 case CX23885_BOARD_HAUPPAUGE_HVR1290:75 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:76 case CX23885_BOARD_TEVII_S470:77 case CX23885_BOARD_HAUPPAUGE_HVR1250:78 case CX23885_BOARD_MYGICA_X8507:79 case CX23885_BOARD_TBS_6980:80 case CX23885_BOARD_TBS_6981:81 case CX23885_BOARD_DVBSKY_T9580:82 case CX23885_BOARD_DVBSKY_T980C:83 case CX23885_BOARD_DVBSKY_S950C:84 case CX23885_BOARD_TT_CT2_4500_CI:85 case CX23885_BOARD_DVBSKY_S950:86 case CX23885_BOARD_DVBSKY_S952:87 case CX23885_BOARD_DVBSKY_T982:88 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:89 /*90 * The only boards we handle right now. However other boards91 * using the CX2388x integrated IR controller should be similar92 */93 break;94 default:95 return;96 }97 98 overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |99 V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);100 101 data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |102 V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);103 104 if (overrun) {105 /* If there was a FIFO overrun, stop the device */106 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);107 params.enable = false;108 /* Mitigate race with cx23885_input_ir_stop() */109 params.shutdown = atomic_read(&dev->ir_input_stopping);110 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);111 }112 113 if (data_available)114 cx23885_input_process_measurements(dev, overrun);115 116 if (overrun) {117 /* If there was a FIFO overrun, clear & restart the device */118 params.enable = true;119 /* Mitigate race with cx23885_input_ir_stop() */120 params.shutdown = atomic_read(&dev->ir_input_stopping);121 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);122 }123}124 125static int cx23885_input_ir_start(struct cx23885_dev *dev)126{127 struct v4l2_subdev_ir_parameters params;128 129 if (dev->sd_ir == NULL)130 return -ENODEV;131 132 atomic_set(&dev->ir_input_stopping, 0);133 134 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);135 switch (dev->board) {136 case CX23885_BOARD_HAUPPAUGE_HVR1270:137 case CX23885_BOARD_HAUPPAUGE_HVR1850:138 case CX23885_BOARD_HAUPPAUGE_HVR1290:139 case CX23885_BOARD_HAUPPAUGE_HVR1250:140 case CX23885_BOARD_MYGICA_X8507:141 case CX23885_BOARD_DVBSKY_T9580:142 case CX23885_BOARD_DVBSKY_T980C:143 case CX23885_BOARD_DVBSKY_S950C:144 case CX23885_BOARD_TT_CT2_4500_CI:145 case CX23885_BOARD_DVBSKY_S950:146 case CX23885_BOARD_DVBSKY_S952:147 case CX23885_BOARD_DVBSKY_T982:148 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:149 /*150 * The IR controller on this board only returns pulse widths.151 * Any other mode setting will fail to set up the device.152 */153 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;154 params.enable = true;155 params.interrupt_enable = true;156 params.shutdown = false;157 158 /* Setup for baseband compatible with both RC-5 and RC-6A */159 params.modulation = false;160 /* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/161 /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/162 params.max_pulse_width = 3333333; /* ns */163 /* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */164 /* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */165 params.noise_filter_min_width = 333333; /* ns */166 /*167 * This board has inverted receive sense:168 * mark is received as low logic level;169 * falling edges are detected as rising edges; etc.170 */171 params.invert_level = true;172 break;173 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:174 case CX23885_BOARD_TEVII_S470:175 case CX23885_BOARD_TBS_6980:176 case CX23885_BOARD_TBS_6981:177 /*178 * The IR controller on this board only returns pulse widths.179 * Any other mode setting will fail to set up the device.180 */181 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;182 params.enable = true;183 params.interrupt_enable = true;184 params.shutdown = false;185 186 /* Setup for a standard NEC protocol */187 params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */188 params.carrier_range_lower = 33000; /* Hz */189 params.carrier_range_upper = 43000; /* Hz */190 params.duty_cycle = 33; /* percent, 33 percent for NEC */191 192 /*193 * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units194 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns195 */196 params.max_pulse_width = 12378022; /* ns */197 198 /*199 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit200 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns201 */202 params.noise_filter_min_width = 351648; /* ns */203 204 params.modulation = false;205 params.invert_level = true;206 break;207 }208 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);209 return 0;210}211 212static int cx23885_input_ir_open(struct rc_dev *rc)213{214 struct cx23885_kernel_ir *kernel_ir = rc->priv;215 216 if (kernel_ir->cx == NULL)217 return -ENODEV;218 219 return cx23885_input_ir_start(kernel_ir->cx);220}221 222static void cx23885_input_ir_stop(struct cx23885_dev *dev)223{224 struct v4l2_subdev_ir_parameters params;225 226 if (dev->sd_ir == NULL)227 return;228 229 /*230 * Stop the sd_ir subdevice from generating notifications and231 * scheduling work.232 * It is shutdown this way in order to mitigate a race with233 * cx23885_input_rx_work_handler() in the overrun case, which could234 * re-enable the subdevice.235 */236 atomic_set(&dev->ir_input_stopping, 1);237 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);238 while (params.shutdown == false) {239 params.enable = false;240 params.interrupt_enable = false;241 params.shutdown = true;242 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms);243 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms);244 }245 flush_work(&dev->cx25840_work);246 flush_work(&dev->ir_rx_work);247 flush_work(&dev->ir_tx_work);248}249 250static void cx23885_input_ir_close(struct rc_dev *rc)251{252 struct cx23885_kernel_ir *kernel_ir = rc->priv;253 254 if (kernel_ir->cx != NULL)255 cx23885_input_ir_stop(kernel_ir->cx);256}257 258int cx23885_input_init(struct cx23885_dev *dev)259{260 struct cx23885_kernel_ir *kernel_ir;261 struct rc_dev *rc;262 char *rc_map;263 u64 allowed_protos;264 265 int ret;266 267 /*268 * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't269 * encapsulated in a v4l2_subdev, then I'm not going to deal with it.270 */271 if (dev->sd_ir == NULL)272 return -ENODEV;273 274 switch (dev->board) {275 case CX23885_BOARD_HAUPPAUGE_HVR1270:276 case CX23885_BOARD_HAUPPAUGE_HVR1850:277 case CX23885_BOARD_HAUPPAUGE_HVR1290:278 case CX23885_BOARD_HAUPPAUGE_HVR1250:279 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:280 /* Integrated CX2388[58] IR controller */281 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;282 /* The grey Hauppauge RC-5 remote */283 rc_map = RC_MAP_HAUPPAUGE;284 break;285 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:286 /* Integrated CX23885 IR controller */287 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;288 /* The grey Terratec remote with orange buttons */289 rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;290 break;291 case CX23885_BOARD_TEVII_S470:292 /* Integrated CX23885 IR controller */293 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;294 /* A guess at the remote */295 rc_map = RC_MAP_TEVII_NEC;296 break;297 case CX23885_BOARD_MYGICA_X8507:298 /* Integrated CX23885 IR controller */299 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;300 /* A guess at the remote */301 rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;302 break;303 case CX23885_BOARD_TBS_6980:304 case CX23885_BOARD_TBS_6981:305 /* Integrated CX23885 IR controller */306 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;307 /* A guess at the remote */308 rc_map = RC_MAP_TBS_NEC;309 break;310 case CX23885_BOARD_DVBSKY_T9580:311 case CX23885_BOARD_DVBSKY_T980C:312 case CX23885_BOARD_DVBSKY_S950C:313 case CX23885_BOARD_DVBSKY_S950:314 case CX23885_BOARD_DVBSKY_S952:315 case CX23885_BOARD_DVBSKY_T982:316 /* Integrated CX23885 IR controller */317 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;318 rc_map = RC_MAP_DVBSKY;319 break;320 case CX23885_BOARD_TT_CT2_4500_CI:321 /* Integrated CX23885 IR controller */322 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER;323 rc_map = RC_MAP_TT_1500;324 break;325 default:326 return -ENODEV;327 }328 329 /* cx23885 board instance kernel IR state */330 kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);331 if (kernel_ir == NULL)332 return -ENOMEM;333 334 kernel_ir->cx = dev;335 kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",336 cx23885_boards[dev->board].name);337 if (!kernel_ir->name) {338 ret = -ENOMEM;339 goto err_out_free;340 }341 342 kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",343 pci_name(dev->pci));344 if (!kernel_ir->phys) {345 ret = -ENOMEM;346 goto err_out_free_name;347 }348 349 /* input device */350 rc = rc_allocate_device(RC_DRIVER_IR_RAW);351 if (!rc) {352 ret = -ENOMEM;353 goto err_out_free_phys;354 }355 356 kernel_ir->rc = rc;357 rc->device_name = kernel_ir->name;358 rc->input_phys = kernel_ir->phys;359 rc->input_id.bustype = BUS_PCI;360 rc->input_id.version = 1;361 if (dev->pci->subsystem_vendor) {362 rc->input_id.vendor = dev->pci->subsystem_vendor;363 rc->input_id.product = dev->pci->subsystem_device;364 } else {365 rc->input_id.vendor = dev->pci->vendor;366 rc->input_id.product = dev->pci->device;367 }368 rc->dev.parent = &dev->pci->dev;369 rc->allowed_protocols = allowed_protos;370 rc->priv = kernel_ir;371 rc->open = cx23885_input_ir_open;372 rc->close = cx23885_input_ir_close;373 rc->map_name = rc_map;374 rc->driver_name = MODULE_NAME;375 376 /* Go */377 dev->kernel_ir = kernel_ir;378 ret = rc_register_device(rc);379 if (ret)380 goto err_out_stop;381 382 return 0;383 384err_out_stop:385 cx23885_input_ir_stop(dev);386 dev->kernel_ir = NULL;387 rc_free_device(rc);388err_out_free_phys:389 kfree(kernel_ir->phys);390err_out_free_name:391 kfree(kernel_ir->name);392err_out_free:393 kfree(kernel_ir);394 return ret;395}396 397void cx23885_input_fini(struct cx23885_dev *dev)398{399 /* Always stop the IR hardware from generating interrupts */400 cx23885_input_ir_stop(dev);401 402 if (dev->kernel_ir == NULL)403 return;404 rc_unregister_device(dev->kernel_ir->rc);405 kfree(dev->kernel_ir->phys);406 kfree(dev->kernel_ir->name);407 kfree(dev->kernel_ir);408 dev->kernel_ir = NULL;409}410