cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cx23885-input.c (11626B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Driver for the Conexant CX23885/7/8 PCIe bridge
      4 *
      5 *  Infrared remote control input device
      6 *
      7 *  Most of this file is
      8 *
      9 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
     10 *
     11 *  However, the cx23885_input_{init,fini} functions contained herein are
     12 *  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 Pascoe
     20 *  Copyright (C) 2003, 2004 Gerd Knorr
     21 *  Copyright (C) 2003 Pavel Machek
     22 */
     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 boards
     91		 * using the CX2388x integrated IR controller should be similar
     92		 */
     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, &params);
    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, &params);
    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, &params);
    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, &params);
    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_units
    194		 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
    195		 */
    196		params.max_pulse_width = 12378022; /* ns */
    197
    198		/*
    199		 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
    200		 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
    201		 */
    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, &params);
    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 and
    231	 * scheduling work.
    232	 * It is shutdown this way in order to mitigate a race with
    233	 * cx23885_input_rx_work_handler() in the overrun case, which could
    234	 * re-enable the subdevice.
    235	 */
    236	atomic_set(&dev->ir_input_stopping, 1);
    237	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
    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, &params);
    243		v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
    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't
    269	 * 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}