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Diffstat (limited to '')
| -rw-r--r-- | drivers/media/rc/ite-cir.h | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/media/rc/ite-cir.h b/drivers/media/rc/ite-cir.h new file mode 100644 index 000000000..4b4294d77 --- /dev/null +++ b/drivers/media/rc/ite-cir.h @@ -0,0 +1,440 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Driver for ITE Tech Inc. IT8712F/IT8512F CIR + * + * Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com> + */ + +/* platform driver name to register */ +#define ITE_DRIVER_NAME "ite-cir" + +/* FIFO sizes */ +#define ITE_TX_FIFO_LEN 32 +#define ITE_RX_FIFO_LEN 32 + +/* interrupt types */ +#define ITE_IRQ_TX_FIFO 1 +#define ITE_IRQ_RX_FIFO 2 +#define ITE_IRQ_RX_FIFO_OVERRUN 4 + +/* forward declaration */ +struct ite_dev; + +/* struct for storing the parameters of different recognized devices */ +struct ite_dev_params { + /* model of the device */ + const char *model; + + /* size of the I/O region */ + int io_region_size; + + /* IR pnp I/O resource number */ + int io_rsrc_no; + + /* hw-specific operation function pointers; most of these must be + * called while holding the spin lock, except for the TX FIFO length + * one */ + /* get pending interrupt causes */ + int (*get_irq_causes) (struct ite_dev *dev); + + /* enable rx */ + void (*enable_rx) (struct ite_dev *dev); + + /* make rx enter the idle state; keep listening for a pulse, but stop + * streaming space bytes */ + void (*idle_rx) (struct ite_dev *dev); + + /* disable rx completely */ + void (*disable_rx) (struct ite_dev *dev); + + /* read bytes from RX FIFO; return read count */ + int (*get_rx_bytes) (struct ite_dev *dev, u8 *buf, int buf_size); + + /* enable tx FIFO space available interrupt */ + void (*enable_tx_interrupt) (struct ite_dev *dev); + + /* disable tx FIFO space available interrupt */ + void (*disable_tx_interrupt) (struct ite_dev *dev); + + /* get number of full TX FIFO slots */ + int (*get_tx_used_slots) (struct ite_dev *dev); + + /* put a byte to the TX FIFO */ + void (*put_tx_byte) (struct ite_dev *dev, u8 value); + + /* disable hardware completely */ + void (*disable) (struct ite_dev *dev); + + /* initialize the hardware */ + void (*init_hardware) (struct ite_dev *dev); + + /* set the carrier parameters */ + void (*set_carrier_params) (struct ite_dev *dev, bool high_freq, + bool use_demodulator, u8 carrier_freq_bits, + u8 allowance_bits, u8 pulse_width_bits); +}; + +/* ITE CIR device structure */ +struct ite_dev { + struct pnp_dev *pdev; + struct rc_dev *rdev; + + /* sync data */ + spinlock_t lock; + bool transmitting; + + /* transmit support */ + wait_queue_head_t tx_queue, tx_ended; + + /* rx low carrier frequency, in Hz, 0 means no demodulation */ + unsigned int rx_low_carrier_freq; + + /* tx high carrier frequency, in Hz, 0 means no demodulation */ + unsigned int rx_high_carrier_freq; + + /* tx carrier frequency, in Hz */ + unsigned int tx_carrier_freq; + + /* duty cycle, 0-100 */ + int tx_duty_cycle; + + /* hardware I/O settings */ + unsigned long cir_addr; + int cir_irq; + + /* overridable copy of model parameters */ + const struct ite_dev_params *params; +}; + +/* common values for all kinds of hardware */ + +/* baud rate divisor default */ +#define ITE_BAUDRATE_DIVISOR 1 + +/* low-speed carrier frequency limits (Hz) */ +#define ITE_LCF_MIN_CARRIER_FREQ 27000 +#define ITE_LCF_MAX_CARRIER_FREQ 58000 + +/* high-speed carrier frequency limits (Hz) */ +#define ITE_HCF_MIN_CARRIER_FREQ 400000 +#define ITE_HCF_MAX_CARRIER_FREQ 500000 + +/* default carrier freq for when demodulator is off (Hz) */ +#define ITE_DEFAULT_CARRIER_FREQ 38000 + +/* convert bits to us */ +#define ITE_BITS_TO_US(bits, sample_period) \ +((u32)((bits) * ITE_BAUDRATE_DIVISOR * (sample_period) / 1000)) + +/* + * n in RDCR produces a tolerance of +/- n * 6.25% around the center + * carrier frequency... + * + * From two limit frequencies, L (low) and H (high), we can get both the + * center frequency F = (L + H) / 2 and the variation from the center + * frequency A = (H - L) / (H + L). We can use this in order to honor the + * s_rx_carrier_range() call in ir-core. We'll suppose that any request + * setting L=0 means we must shut down the demodulator. + */ +#define ITE_RXDCR_PER_10000_STEP 625 + +/* high speed carrier freq values */ +#define ITE_CFQ_400 0x03 +#define ITE_CFQ_450 0x08 +#define ITE_CFQ_480 0x0b +#define ITE_CFQ_500 0x0d + +/* values for pulse widths */ +#define ITE_TXMPW_A 0x02 +#define ITE_TXMPW_B 0x03 +#define ITE_TXMPW_C 0x04 +#define ITE_TXMPW_D 0x05 +#define ITE_TXMPW_E 0x06 + +/* values for demodulator carrier range allowance */ +#define ITE_RXDCR_DEFAULT 0x01 /* default carrier range */ +#define ITE_RXDCR_MAX 0x07 /* default carrier range */ + +/* DR TX bits */ +#define ITE_TX_PULSE 0x00 +#define ITE_TX_SPACE 0x80 +#define ITE_TX_MAX_RLE 0x80 +#define ITE_TX_RLE_MASK 0x7f + +/* + * IT8712F + * + * hardware data obtained from: + * + * IT8712F + * Environment Control - Low Pin Count Input / Output + * (EC - LPC I/O) + * Preliminary Specification V0. 81 + */ + +/* register offsets */ +#define IT87_DR 0x00 /* data register */ +#define IT87_IER 0x01 /* interrupt enable register */ +#define IT87_RCR 0x02 /* receiver control register */ +#define IT87_TCR1 0x03 /* transmitter control register 1 */ +#define IT87_TCR2 0x04 /* transmitter control register 2 */ +#define IT87_TSR 0x05 /* transmitter status register */ +#define IT87_RSR 0x06 /* receiver status register */ +#define IT87_BDLR 0x05 /* baud rate divisor low byte register */ +#define IT87_BDHR 0x06 /* baud rate divisor high byte register */ +#define IT87_IIR 0x07 /* interrupt identification register */ + +#define IT87_IOREG_LENGTH 0x08 /* length of register file */ + +/* IER bits */ +#define IT87_TLDLIE 0x01 /* transmitter low data interrupt enable */ +#define IT87_RDAIE 0x02 /* receiver data available interrupt enable */ +#define IT87_RFOIE 0x04 /* receiver FIFO overrun interrupt enable */ +#define IT87_IEC 0x08 /* interrupt enable control */ +#define IT87_BR 0x10 /* baud rate register enable */ +#define IT87_RESET 0x20 /* reset */ + +/* RCR bits */ +#define IT87_RXDCR 0x07 /* receiver demodulation carrier range mask */ +#define IT87_RXACT 0x08 /* receiver active */ +#define IT87_RXEND 0x10 /* receiver demodulation enable */ +#define IT87_RXEN 0x20 /* receiver enable */ +#define IT87_HCFS 0x40 /* high-speed carrier frequency select */ +#define IT87_RDWOS 0x80 /* receiver data without sync */ + +/* TCR1 bits */ +#define IT87_TXMPM 0x03 /* transmitter modulation pulse mode mask */ +#define IT87_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */ +#define IT87_TXENDF 0x04 /* transmitter deferral */ +#define IT87_TXRLE 0x08 /* transmitter run length enable */ +#define IT87_FIFOTL 0x30 /* FIFO level threshold mask */ +#define IT87_FIFOTL_DEFAULT 0x20 /* FIFO level threshold default + * 0x00 -> 1, 0x10 -> 7, 0x20 -> 17, + * 0x30 -> 25 */ +#define IT87_ILE 0x40 /* internal loopback enable */ +#define IT87_FIFOCLR 0x80 /* FIFO clear bit */ + +/* TCR2 bits */ +#define IT87_TXMPW 0x07 /* transmitter modulation pulse width mask */ +#define IT87_TXMPW_DEFAULT 0x04 /* default modulation pulse width */ +#define IT87_CFQ 0xf8 /* carrier frequency mask */ +#define IT87_CFQ_SHIFT 3 /* carrier frequency bit shift */ + +/* TSR bits */ +#define IT87_TXFBC 0x3f /* transmitter FIFO byte count mask */ + +/* RSR bits */ +#define IT87_RXFBC 0x3f /* receiver FIFO byte count mask */ +#define IT87_RXFTO 0x80 /* receiver FIFO time-out */ + +/* IIR bits */ +#define IT87_IP 0x01 /* interrupt pending */ +#define IT87_II 0x06 /* interrupt identification mask */ +#define IT87_II_NOINT 0x00 /* no interrupt */ +#define IT87_II_TXLDL 0x02 /* transmitter low data level */ +#define IT87_II_RXDS 0x04 /* receiver data stored */ +#define IT87_II_RXFO 0x06 /* receiver FIFO overrun */ + +/* + * IT8512E/F + * + * Hardware data obtained from: + * + * IT8512E/F + * Embedded Controller + * Preliminary Specification V0.4.1 + * + * Note that the CIR registers are not directly available to the host, because + * they only are accessible to the integrated microcontroller. Thus, in order + * use it, some kind of bridging is required. As the bridging may depend on + * the controller firmware in use, we are going to use the PNP ID in order to + * determine the strategy and ports available. See after these generic + * IT8512E/F register definitions for register definitions for those + * strategies. + */ + +/* register offsets */ +#define IT85_C0DR 0x00 /* data register */ +#define IT85_C0MSTCR 0x01 /* master control register */ +#define IT85_C0IER 0x02 /* interrupt enable register */ +#define IT85_C0IIR 0x03 /* interrupt identification register */ +#define IT85_C0CFR 0x04 /* carrier frequency register */ +#define IT85_C0RCR 0x05 /* receiver control register */ +#define IT85_C0TCR 0x06 /* transmitter control register */ +#define IT85_C0SCK 0x07 /* slow clock control register */ +#define IT85_C0BDLR 0x08 /* baud rate divisor low byte register */ +#define IT85_C0BDHR 0x09 /* baud rate divisor high byte register */ +#define IT85_C0TFSR 0x0a /* transmitter FIFO status register */ +#define IT85_C0RFSR 0x0b /* receiver FIFO status register */ +#define IT85_C0WCL 0x0d /* wakeup code length register */ +#define IT85_C0WCR 0x0e /* wakeup code read/write register */ +#define IT85_C0WPS 0x0f /* wakeup power control/status register */ + +#define IT85_IOREG_LENGTH 0x10 /* length of register file */ + +/* C0MSTCR bits */ +#define IT85_RESET 0x01 /* reset */ +#define IT85_FIFOCLR 0x02 /* FIFO clear bit */ +#define IT85_FIFOTL 0x0c /* FIFO level threshold mask */ +#define IT85_FIFOTL_DEFAULT 0x08 /* FIFO level threshold default + * 0x00 -> 1, 0x04 -> 7, 0x08 -> 17, + * 0x0c -> 25 */ +#define IT85_ILE 0x10 /* internal loopback enable */ +#define IT85_ILSEL 0x20 /* internal loopback select */ + +/* C0IER bits */ +#define IT85_TLDLIE 0x01 /* TX low data level interrupt enable */ +#define IT85_RDAIE 0x02 /* RX data available interrupt enable */ +#define IT85_RFOIE 0x04 /* RX FIFO overrun interrupt enable */ +#define IT85_IEC 0x80 /* interrupt enable function control */ + +/* C0IIR bits */ +#define IT85_TLDLI 0x01 /* transmitter low data level interrupt */ +#define IT85_RDAI 0x02 /* receiver data available interrupt */ +#define IT85_RFOI 0x04 /* receiver FIFO overrun interrupt */ +#define IT85_NIP 0x80 /* no interrupt pending */ + +/* C0CFR bits */ +#define IT85_CFQ 0x1f /* carrier frequency mask */ +#define IT85_HCFS 0x20 /* high speed carrier frequency select */ + +/* C0RCR bits */ +#define IT85_RXDCR 0x07 /* receiver demodulation carrier range mask */ +#define IT85_RXACT 0x08 /* receiver active */ +#define IT85_RXEND 0x10 /* receiver demodulation enable */ +#define IT85_RDWOS 0x20 /* receiver data without sync */ +#define IT85_RXEN 0x80 /* receiver enable */ + +/* C0TCR bits */ +#define IT85_TXMPW 0x07 /* transmitter modulation pulse width mask */ +#define IT85_TXMPW_DEFAULT 0x04 /* default modulation pulse width */ +#define IT85_TXMPM 0x18 /* transmitter modulation pulse mode mask */ +#define IT85_TXMPM_DEFAULT 0x00 /* modulation pulse mode default */ +#define IT85_TXENDF 0x20 /* transmitter deferral */ +#define IT85_TXRLE 0x40 /* transmitter run length enable */ + +/* C0SCK bits */ +#define IT85_SCKS 0x01 /* slow clock select */ +#define IT85_TXDCKG 0x02 /* TXD clock gating */ +#define IT85_DLL1P8E 0x04 /* DLL 1.8432M enable */ +#define IT85_DLLTE 0x08 /* DLL test enable */ +#define IT85_BRCM 0x70 /* baud rate count mode */ +#define IT85_DLLOCK 0x80 /* DLL lock */ + +/* C0TFSR bits */ +#define IT85_TXFBC 0x3f /* transmitter FIFO count mask */ + +/* C0RFSR bits */ +#define IT85_RXFBC 0x3f /* receiver FIFO count mask */ +#define IT85_RXFTO 0x80 /* receiver FIFO time-out */ + +/* C0WCL bits */ +#define IT85_WCL 0x3f /* wakeup code length mask */ + +/* C0WPS bits */ +#define IT85_CIRPOSIE 0x01 /* power on/off status interrupt enable */ +#define IT85_CIRPOIS 0x02 /* power on/off interrupt status */ +#define IT85_CIRPOII 0x04 /* power on/off interrupt identification */ +#define IT85_RCRST 0x10 /* wakeup code reading counter reset bit */ +#define IT85_WCRST 0x20 /* wakeup code writing counter reset bit */ + +/* + * ITE8708 + * + * Hardware data obtained from hacked driver for IT8512 in this forum post: + * + * http://ubuntuforums.org/showthread.php?t=1028640 + * + * Although there's no official documentation for that driver, analysis would + * suggest that it maps the 16 registers of IT8512 onto two 8-register banks, + * selectable by a single bank-select bit that's mapped onto both banks. The + * IT8512 registers are mapped in a different order, so that the first bank + * maps the ones that are used more often, and two registers that share a + * reserved high-order bit are placed at the same offset in both banks in + * order to reuse the reserved bit as the bank select bit. + */ + +/* register offsets */ + +/* mapped onto both banks */ +#define IT8708_BANKSEL 0x07 /* bank select register */ +#define IT8708_HRAE 0x80 /* high registers access enable */ + +/* mapped onto the low bank */ +#define IT8708_C0DR 0x00 /* data register */ +#define IT8708_C0MSTCR 0x01 /* master control register */ +#define IT8708_C0IER 0x02 /* interrupt enable register */ +#define IT8708_C0IIR 0x03 /* interrupt identification register */ +#define IT8708_C0RFSR 0x04 /* receiver FIFO status register */ +#define IT8708_C0RCR 0x05 /* receiver control register */ +#define IT8708_C0TFSR 0x06 /* transmitter FIFO status register */ +#define IT8708_C0TCR 0x07 /* transmitter control register */ + +/* mapped onto the high bank */ +#define IT8708_C0BDLR 0x01 /* baud rate divisor low byte register */ +#define IT8708_C0BDHR 0x02 /* baud rate divisor high byte register */ +#define IT8708_C0CFR 0x04 /* carrier frequency register */ + +/* registers whose bank mapping we don't know, since they weren't being used + * in the hacked driver... most probably they belong to the high bank too, + * since they fit in the holes the other registers leave */ +#define IT8708_C0SCK 0x03 /* slow clock control register */ +#define IT8708_C0WCL 0x05 /* wakeup code length register */ +#define IT8708_C0WCR 0x06 /* wakeup code read/write register */ +#define IT8708_C0WPS 0x07 /* wakeup power control/status register */ + +#define IT8708_IOREG_LENGTH 0x08 /* length of register file */ + +/* two more registers that are defined in the hacked driver, but can't be + * found in the data sheets; no idea what they are or how they are accessed, + * since the hacked driver doesn't seem to use them */ +#define IT8708_CSCRR 0x00 +#define IT8708_CGPINTR 0x01 + +/* CSCRR bits */ +#define IT8708_CSCRR_SCRB 0x3f +#define IT8708_CSCRR_PM 0x80 + +/* CGPINTR bits */ +#define IT8708_CGPINT 0x01 + +/* + * ITE8709 + * + * Hardware interfacing data obtained from the original lirc_ite8709 driver. + * Verbatim from its sources: + * + * The ITE8709 device seems to be the combination of IT8512 superIO chip and + * a specific firmware running on the IT8512's embedded micro-controller. + * In addition of the embedded micro-controller, the IT8512 chip contains a + * CIR module and several other modules. A few modules are directly accessible + * by the host CPU, but most of them are only accessible by the + * micro-controller. The CIR module is only accessible by the + * micro-controller. + * + * The battery-backed SRAM module is accessible by the host CPU and the + * micro-controller. So one of the MC's firmware role is to act as a bridge + * between the host CPU and the CIR module. The firmware implements a kind of + * communication protocol using the SRAM module as a shared memory. The IT8512 + * specification is publicly available on ITE's web site, but the + * communication protocol is not, so it was reverse-engineered. + */ + +/* register offsets */ +#define IT8709_RAM_IDX 0x00 /* index into the SRAM module bytes */ +#define IT8709_RAM_VAL 0x01 /* read/write data to the indexed byte */ + +#define IT8709_IOREG_LENGTH 0x02 /* length of register file */ + +/* register offsets inside the SRAM module */ +#define IT8709_MODE 0x1a /* request/ack byte */ +#define IT8709_REG_IDX 0x1b /* index of the CIR register to access */ +#define IT8709_REG_VAL 0x1c /* value read/to be written */ +#define IT8709_IIR 0x1e /* interrupt identification register */ +#define IT8709_RFSR 0x1f /* receiver FIFO status register */ +#define IT8709_FIFO 0x20 /* start of in RAM RX FIFO copy */ + +/* MODE values */ +#define IT8709_IDLE 0x00 +#define IT8709_WRITE 0x01 +#define IT8709_READ 0x02 |