diff options
Diffstat (limited to 'drivers/media/rc/img-ir/img-ir-sony.c')
| -rw-r--r-- | drivers/media/rc/img-ir/img-ir-sony.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/media/rc/img-ir/img-ir-sony.c b/drivers/media/rc/img-ir/img-ir-sony.c new file mode 100644 index 000000000000..993409a51a71 --- /dev/null +++ b/drivers/media/rc/img-ir/img-ir-sony.c @@ -0,0 +1,145 @@ +/* + * ImgTec IR Decoder setup for Sony (SIRC) protocol. + * + * Copyright 2012-2014 Imagination Technologies Ltd. + */ + +#include "img-ir-hw.h" + +/* Convert Sony data to a scancode */ +static int img_ir_sony_scancode(int len, u64 raw, int *scancode, u64 protocols) +{ + unsigned int dev, subdev, func; + + switch (len) { + case 12: + if (!(protocols & RC_BIT_SONY12)) + return -EINVAL; + func = raw & 0x7f; /* first 7 bits */ + raw >>= 7; + dev = raw & 0x1f; /* next 5 bits */ + subdev = 0; + break; + case 15: + if (!(protocols & RC_BIT_SONY15)) + return -EINVAL; + func = raw & 0x7f; /* first 7 bits */ + raw >>= 7; + dev = raw & 0xff; /* next 8 bits */ + subdev = 0; + break; + case 20: + if (!(protocols & RC_BIT_SONY20)) + return -EINVAL; + func = raw & 0x7f; /* first 7 bits */ + raw >>= 7; + dev = raw & 0x1f; /* next 5 bits */ + raw >>= 5; + subdev = raw & 0xff; /* next 8 bits */ + break; + default: + return -EINVAL; + } + *scancode = dev << 16 | subdev << 8 | func; + return IMG_IR_SCANCODE; +} + +/* Convert NEC scancode to NEC data filter */ +static int img_ir_sony_filter(const struct rc_scancode_filter *in, + struct img_ir_filter *out, u64 protocols) +{ + unsigned int dev, subdev, func; + unsigned int dev_m, subdev_m, func_m; + unsigned int len = 0; + + dev = (in->data >> 16) & 0xff; + dev_m = (in->mask >> 16) & 0xff; + subdev = (in->data >> 8) & 0xff; + subdev_m = (in->mask >> 8) & 0xff; + func = (in->data >> 0) & 0x7f; + func_m = (in->mask >> 0) & 0x7f; + + if (subdev & subdev_m) { + /* can't encode subdev and higher device bits */ + if (dev & dev_m & 0xe0) + return -EINVAL; + /* subdevice (extended) bits only in 20 bit encoding */ + if (!(protocols & RC_BIT_SONY20)) + return -EINVAL; + len = 20; + dev_m &= 0x1f; + } else if (dev & dev_m & 0xe0) { + /* upper device bits only in 15 bit encoding */ + if (!(protocols & RC_BIT_SONY15)) + return -EINVAL; + len = 15; + subdev_m = 0; + } else { + /* + * The hardware mask cannot distinguish high device bits and low + * extended bits, so logically AND those bits of the masks + * together. + */ + subdev_m &= (dev_m >> 5) | 0xf8; + dev_m &= 0x1f; + } + + /* ensure there aren't any bits straying between fields */ + dev &= dev_m; + subdev &= subdev_m; + + /* write the hardware filter */ + out->data = func | + dev << 7 | + subdev << 15; + out->mask = func_m | + dev_m << 7 | + subdev_m << 15; + + if (len) { + out->minlen = len; + out->maxlen = len; + } + return 0; +} + +/* + * Sony SIRC decoder + * See also http://www.sbprojects.com/knowledge/ir/sirc.php + * http://picprojects.org.uk/projects/sirc/sonysirc.pdf + */ +struct img_ir_decoder img_ir_sony = { + .type = RC_BIT_SONY12 | RC_BIT_SONY15 | RC_BIT_SONY20, + .control = { + .decoden = 1, + .code_type = IMG_IR_CODETYPE_PULSELEN, + }, + /* main timings */ + .unit = 600000, /* 600 us */ + .timings = { + /* leader symbol */ + .ldr = { + .pulse = { 4 /* 2.4 ms */ }, + .space = { 1 /* 600 us */ }, + }, + /* 0 symbol */ + .s00 = { + .pulse = { 1 /* 600 us */ }, + .space = { 1 /* 600 us */ }, + }, + /* 1 symbol */ + .s01 = { + .pulse = { 2 /* 1.2 ms */ }, + .space = { 1 /* 600 us */ }, + }, + /* free time */ + .ft = { + .minlen = 12, + .maxlen = 20, + .ft_min = 10, /* 6 ms */ + }, + }, + /* scancode logic */ + .scancode = img_ir_sony_scancode, + .filter = img_ir_sony_filter, +}; |