/*
* Driver for ITE Tech Inc. IT8712F/IT8512F CIR
*
* Copyright (C) 2010 Juan Jesús García de Soria <skandalfo@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*/
/* platform driver name to register */
#define ITE_DRIVER_NAME "ite-cir"
/* logging macros */
#define ite_pr(level, text, ...) \
printk(level KBUILD_MODNAME ": " text, ## __VA_ARGS__)
#define ite_dbg(text, ...) do { \
if (debug) \
printk(KERN_DEBUG \
KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__); \
} while (0)
#define ite_dbg_verbose(text, ...) do {\
if (debug > 1) \
printk(KERN_DEBUG \
KBUILD_MODNAME ": " text "\n" , ## __VA_ARGS__); \
} while (0)
/* 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;
/* true if the hardware supports transmission */
bool hw_tx_capable;
/* base sampling period, in ns */
u32 sample_period;
/* 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;
/* 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;
struct ir_raw_event rawir;
/* sync data */
spinlock_t lock;
bool in_use, transmitting;
/* transmit support */
int tx_fifo_allowance;
wait_queue_head_t tx_queue, tx_ended;
/* hardware I/O settings */
unsigned long cir_addr;
int cir_irq;
/* overridable copy of model parameters */
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
/* default idling timeout in ns (0.2 seconds) */
#define ITE_IDLE_TIMEOUT 200000000UL
/* limit timeout values */
#define ITE_MIN_IDLE_TIMEOUT 100000000UL
#define ITE_MAX_IDLE_TIMEOUT 1000000000UL
/* convert bits to us */
#define ITE_BITS_TO_NS(bits, sample_period) \
((u32) ((bits) * ITE_BAUDRATE_DIVISOR * sample_period))
/*
* 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
