diff options
Diffstat (limited to 'drivers/media/video/saa7134/saa7134-input.c')
-rw-r--r-- | drivers/media/video/saa7134/saa7134-input.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c index e6217fe13339..ad08d13dffdd 100644 --- a/drivers/media/video/saa7134/saa7134-input.c +++ b/drivers/media/video/saa7134/saa7134-input.c @@ -198,6 +198,84 @@ static int get_key_beholdm6xx(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) return 1; } +/* Common (grey or coloured) pinnacle PCTV remote handling + * + */ +static int get_key_pinnacle(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw, + int parity_offset, int marker, int code_modulo) +{ + unsigned char b[4]; + unsigned int start = 0,parity = 0,code = 0; + + /* poll IR chip */ + if (4 != i2c_master_recv(&ir->c, b, 4)) { + i2cdprintk("read error\n"); + return -EIO; + } + + for (start = 0; start < ARRAY_SIZE(b); start++) { + if (b[start] == marker) { + code=b[(start+parity_offset + 1) % 4]; + parity=b[(start+parity_offset) % 4]; + } + } + + /* Empty Request */ + if (parity == 0) + return 0; + + /* Repeating... */ + if (ir->old == parity) + return 0; + + ir->old = parity; + + /* drop special codes when a key is held down a long time for the grey controller + In this case, the second bit of the code is asserted */ + if (marker == 0xfe && (code & 0x40)) + return 0; + + code %= code_modulo; + + *ir_raw = code; + *ir_key = code; + + i2cdprintk("Pinnacle PCTV key %02x\n", code); + + return 1; +} + +/* The grey pinnacle PCTV remote + * + * There are one issue with this remote: + * - I2c packet does not change when the same key is pressed quickly. The workaround + * is to hold down each key for about half a second, so that another code is generated + * in the i2c packet, and the function can distinguish key presses. + * + * Sylvain Pasche <sylvain.pasche@gmail.com> + */ +static int get_key_pinnacle_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) +{ + + return get_key_pinnacle(ir, ir_key, ir_raw, 1, 0xfe, 0xff); +} + + +/* The new pinnacle PCTV remote (with the colored buttons) + * + * Ricardo Cerqueira <v4l@cerqueira.org> + */ +static int get_key_pinnacle_color(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw) +{ + /* code_modulo parameter (0x88) is used to reduce code value to fit inside IR_KEYTAB_SIZE + * + * this is the only value that results in 42 unique + * codes < 128 + */ + + return get_key_pinnacle(ir, ir_key, ir_raw, 2, 0x80, 0x88); +} + void saa7134_input_irq(struct saa7134_dev *dev) { struct card_ir *ir = dev->remote; |