diff options
Diffstat (limited to 'drivers/media/rc/ite-cir.c')
| -rw-r--r-- | drivers/media/rc/ite-cir.c | 1736 |
1 files changed, 1736 insertions, 0 deletions
diff --git a/drivers/media/rc/ite-cir.c b/drivers/media/rc/ite-cir.c new file mode 100644 index 0000000..9be6a83 --- /dev/null +++ b/drivers/media/rc/ite-cir.c @@ -0,0 +1,1736 @@ +/* + * Driver for ITE Tech Inc. IT8712F/IT8512 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. + * + * Inspired by the original lirc_it87 and lirc_ite8709 drivers, on top of the + * skeleton provided by the nuvoton-cir driver. + * + * The lirc_it87 driver was originally written by Hans-Gunter Lutke Uphues + * <hg_lu@web.de> in 2001, with enhancements by Christoph Bartelmus + * <lirc@bartelmus.de>, Andrew Calkin <r_tay@hotmail.com> and James Edwards + * <jimbo-lirc@edwardsclan.net>. + * + * The lirc_ite8709 driver was written by Grégory Lardière + * <spmf2004-lirc@yahoo.fr> in 2008. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pnp.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/input.h> +#include <linux/bitops.h> +#include <media/rc-core.h> +#include <linux/pci_ids.h> + +#include "ite-cir.h" + +/* module parameters */ + +/* debug level */ +static int debug; +module_param(debug, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(debug, "Enable debugging output"); + +/* low limit for RX carrier freq, Hz, 0 for no RX demodulation */ +static int rx_low_carrier_freq; +module_param(rx_low_carrier_freq, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(rx_low_carrier_freq, "Override low RX carrier frequency, Hz, " + "0 for no RX demodulation"); + +/* high limit for RX carrier freq, Hz, 0 for no RX demodulation */ +static int rx_high_carrier_freq; +module_param(rx_high_carrier_freq, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(rx_high_carrier_freq, "Override high RX carrier frequency, " + "Hz, 0 for no RX demodulation"); + +/* override tx carrier frequency */ +static int tx_carrier_freq; +module_param(tx_carrier_freq, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(tx_carrier_freq, "Override TX carrier frequency, Hz"); + +/* override tx duty cycle */ +static int tx_duty_cycle; +module_param(tx_duty_cycle, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(tx_duty_cycle, "Override TX duty cycle, 1-100"); + +/* override default sample period */ +static long sample_period; +module_param(sample_period, long, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(sample_period, "Override carrier sample period, us"); + +/* override detected model id */ +static int model_number = -1; +module_param(model_number, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(model_number, "Use this model number, don't autodetect"); + + +/* HW-independent code functions */ + +/* check whether carrier frequency is high frequency */ +static inline bool ite_is_high_carrier_freq(unsigned int freq) +{ + return freq >= ITE_HCF_MIN_CARRIER_FREQ; +} + +/* get the bits required to program the carrier frequency in CFQ bits, + * unshifted */ +static u8 ite_get_carrier_freq_bits(unsigned int freq) +{ + if (ite_is_high_carrier_freq(freq)) { + if (freq < 425000) + return ITE_CFQ_400; + + else if (freq < 465000) + return ITE_CFQ_450; + + else if (freq < 490000) + return ITE_CFQ_480; + + else + return ITE_CFQ_500; + } else { + /* trim to limits */ + if (freq < ITE_LCF_MIN_CARRIER_FREQ) + freq = ITE_LCF_MIN_CARRIER_FREQ; + if (freq > ITE_LCF_MAX_CARRIER_FREQ) + freq = ITE_LCF_MAX_CARRIER_FREQ; + + /* convert to kHz and subtract the base freq */ + freq = + DIV_ROUND_CLOSEST(freq - ITE_LCF_MIN_CARRIER_FREQ, + 1000); + + return (u8) freq; + } +} + +/* get the bits required to program the pulse with in TXMPW */ +static u8 ite_get_pulse_width_bits(unsigned int freq, int duty_cycle) +{ + unsigned long period_ns, on_ns; + + /* sanitize freq into range */ + if (freq < ITE_LCF_MIN_CARRIER_FREQ) + freq = ITE_LCF_MIN_CARRIER_FREQ; + if (freq > ITE_HCF_MAX_CARRIER_FREQ) + freq = ITE_HCF_MAX_CARRIER_FREQ; + + period_ns = 1000000000UL / freq; + on_ns = period_ns * duty_cycle / 100; + + if (ite_is_high_carrier_freq(freq)) { + if (on_ns < 750) + return ITE_TXMPW_A; + + else if (on_ns < 850) + return ITE_TXMPW_B; + + else if (on_ns < 950) + return ITE_TXMPW_C; + + else if (on_ns < 1080) + return ITE_TXMPW_D; + + else + return ITE_TXMPW_E; + } else { + if (on_ns < 6500) + return ITE_TXMPW_A; + + else if (on_ns < 7850) + return ITE_TXMPW_B; + + else if (on_ns < 9650) + return ITE_TXMPW_C; + + else if (on_ns < 11950) + return ITE_TXMPW_D; + + else + return ITE_TXMPW_E; + } +} + +/* decode raw bytes as received by the hardware, and push them to the ir-core + * layer */ +static void ite_decode_bytes(struct ite_dev *dev, const u8 * data, int + length) +{ + u32 sample_period; + unsigned long *ldata; + unsigned int next_one, next_zero, size; + DEFINE_IR_RAW_EVENT(ev); + + if (length == 0) + return; + + sample_period = dev->params.sample_period; + ldata = (unsigned long *)data; + size = length << 3; + next_one = generic_find_next_le_bit(ldata, size, 0); + if (next_one > 0) { + ev.pulse = true; + ev.duration = + ITE_BITS_TO_NS(next_one, sample_period); + ir_raw_event_store_with_filter(dev->rdev, &ev); + } + + while (next_one < size) { + next_zero = generic_find_next_zero_le_bit(ldata, size, next_one + 1); + ev.pulse = false; + ev.duration = ITE_BITS_TO_NS(next_zero - next_one, sample_period); + ir_raw_event_store_with_filter(dev->rdev, &ev); + + if (next_zero < size) { + next_one = + generic_find_next_le_bit(ldata, + size, + next_zero + 1); + ev.pulse = true; + ev.duration = + ITE_BITS_TO_NS(next_one - next_zero, + sample_period); + ir_raw_event_store_with_filter + (dev->rdev, &ev); + } else + next_one = size; + } + + ir_raw_event_handle(dev->rdev); + + ite_dbg_verbose("decoded %d bytes.", length); +} + +/* set all the rx/tx carrier parameters; this must be called with the device + * spinlock held */ +static void ite_set_carrier_params(struct ite_dev *dev) +{ + unsigned int freq, low_freq, high_freq; + int allowance; + bool use_demodulator; + bool for_tx = dev->transmitting; + + ite_dbg("%s called", __func__); + + if (for_tx) { + /* we don't need no stinking calculations */ + freq = dev->params.tx_carrier_freq; + allowance = ITE_RXDCR_DEFAULT; + use_demodulator = false; + } else { + low_freq = dev->params.rx_low_carrier_freq; + high_freq = dev->params.rx_high_carrier_freq; + + if (low_freq == 0) { + /* don't demodulate */ + freq = + ITE_DEFAULT_CARRIER_FREQ; + allowance = ITE_RXDCR_DEFAULT; + use_demodulator = false; + } else { + /* calculate the middle freq */ + freq = (low_freq + high_freq) / 2; + + /* calculate the allowance */ + allowance = + DIV_ROUND_CLOSEST(10000 * (high_freq - low_freq), + ITE_RXDCR_PER_10000_STEP + * (high_freq + low_freq)); + + if (allowance < 1) + allowance = 1; + + if (allowance > ITE_RXDCR_MAX) + allowance = ITE_RXDCR_MAX; + } + } + + /* set the carrier parameters in a device-dependent way */ + dev->params.set_carrier_params(dev, ite_is_high_carrier_freq(freq), + use_demodulator, ite_get_carrier_freq_bits(freq), allowance, + ite_get_pulse_width_bits(freq, dev->params.tx_duty_cycle)); +} + +/* interrupt service routine for incoming and outgoing CIR data */ +static irqreturn_t ite_cir_isr(int irq, void *data) +{ + struct ite_dev *dev = data; + unsigned long flags; + irqreturn_t ret = IRQ_RETVAL(IRQ_NONE); + u8 rx_buf[ITE_RX_FIFO_LEN]; + int rx_bytes; + int iflags; + + ite_dbg_verbose("%s firing", __func__); + + /* grab the spinlock */ + spin_lock_irqsave(&dev->lock, flags); + + /* read the interrupt flags */ + iflags = dev->params.get_irq_causes(dev); + + /* check for the receive interrupt */ + if (iflags & (ITE_IRQ_RX_FIFO | ITE_IRQ_RX_FIFO_OVERRUN)) { + /* read the FIFO bytes */ + rx_bytes = + dev->params.get_rx_bytes(dev, rx_buf, + ITE_RX_FIFO_LEN); + + if (rx_bytes > 0) { + /* drop the spinlock, since the ir-core layer + * may call us back again through + * ite_s_idle() */ + spin_unlock_irqrestore(&dev-> + lock, + flags); + + /* decode the data we've just received */ + ite_decode_bytes(dev, rx_buf, + rx_bytes); + + /* reacquire the spinlock */ + spin_lock_irqsave(&dev->lock, + flags); + + /* mark the interrupt as serviced */ + ret = IRQ_RETVAL(IRQ_HANDLED); + } + } else if (iflags & ITE_IRQ_TX_FIFO) { + /* FIFO space available interrupt */ + ite_dbg_verbose("got interrupt for TX FIFO"); + + /* wake any sleeping transmitter */ + wake_up_interruptible(&dev->tx_queue); + + /* mark the interrupt as serviced */ + ret = IRQ_RETVAL(IRQ_HANDLED); + } + + /* drop the spinlock */ + spin_unlock_irqrestore(&dev->lock, flags); + + ite_dbg_verbose("%s done returning %d", __func__, (int)ret); + + return ret; +} + +/* set the rx carrier freq range, guess it's in Hz... */ +static int ite_set_rx_carrier_range(struct rc_dev *rcdev, u32 carrier_low, u32 + carrier_high) +{ + unsigned long flags; + struct ite_dev *dev = rcdev->priv; + + spin_lock_irqsave(&dev->lock, flags); + dev->params.rx_low_carrier_freq = carrier_low; + dev->params.rx_high_carrier_freq = carrier_high; + ite_set_carrier_params(dev); + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/* set the tx carrier freq, guess it's in Hz... */ +static int ite_set_tx_carrier(struct rc_dev *rcdev, u32 carrier) +{ + unsigned long flags; + struct ite_dev *dev = rcdev->priv; + + spin_lock_irqsave(&dev->lock, flags); + dev->params.tx_carrier_freq = carrier; + ite_set_carrier_params(dev); + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/* set the tx duty cycle by controlling the pulse width */ +static int ite_set_tx_duty_cycle(struct rc_dev *rcdev, u32 duty_cycle) +{ + unsigned long flags; + struct ite_dev *dev = rcdev->priv; + + spin_lock_irqsave(&dev->lock, flags); + dev->params.tx_duty_cycle = duty_cycle; + ite_set_carrier_params(dev); + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/* transmit out IR pulses; what you get here is a batch of alternating + * pulse/space/pulse/space lengths that we should write out completely through + * the FIFO, blocking on a full FIFO */ +static int ite_tx_ir(struct rc_dev *rcdev, int *txbuf, u32 n) +{ + unsigned long flags; + struct ite_dev *dev = rcdev->priv; + bool is_pulse = false; + int remaining_us, fifo_avail, fifo_remaining, last_idx = 0; + int max_rle_us, next_rle_us; + int ret = n; + u8 last_sent[ITE_TX_FIFO_LEN]; + u8 val; + + ite_dbg("%s called", __func__); + + /* clear the array just in case */ + memset(last_sent, 0, ARRAY_SIZE(last_sent)); + + /* n comes in bytes; convert to ints */ + n /= sizeof(int); + + spin_lock_irqsave(&dev->lock, flags); + + /* let everybody know we're now transmitting */ + dev->transmitting = true; + + /* and set the carrier values for transmission */ + ite_set_carrier_params(dev); + + /* calculate how much time we can send in one byte */ + max_rle_us = + (ITE_BAUDRATE_DIVISOR * dev->params.sample_period * + ITE_TX_MAX_RLE) / 1000; + + /* disable the receiver */ + dev->params.disable_rx(dev); + + /* this is where we'll begin filling in the FIFO, until it's full. + * then we'll just activate the interrupt, wait for it to wake us up + * again, disable it, continue filling the FIFO... until everything + * has been pushed out */ + fifo_avail = + ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev); + + while (n > 0 && dev->in_use) { + /* transmit the next sample */ + is_pulse = !is_pulse; + remaining_us = *(txbuf++); + n--; + + ite_dbg("%s: %ld", + ((is_pulse) ? "pulse" : "space"), + (long int) + remaining_us); + + /* repeat while the pulse is non-zero length */ + while (remaining_us > 0 && dev->in_use) { + if (remaining_us > max_rle_us) + next_rle_us = max_rle_us; + + else + next_rle_us = remaining_us; + + remaining_us -= next_rle_us; + + /* check what's the length we have to pump out */ + val = (ITE_TX_MAX_RLE * next_rle_us) / max_rle_us; + + /* put it into the sent buffer */ + last_sent[last_idx++] = val; + last_idx &= (ITE_TX_FIFO_LEN); + + /* encode it for 7 bits */ + val = (val - 1) & ITE_TX_RLE_MASK; + + /* take into account pulse/space prefix */ + if (is_pulse) + val |= ITE_TX_PULSE; + + else + val |= ITE_TX_SPACE; + + /* + * if we get to 0 available, read again, just in case + * some other slot got freed + */ + if (fifo_avail <= 0) + fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev); + + /* if it's still full */ + if (fifo_avail <= 0) { + /* enable the tx interrupt */ + dev->params. + enable_tx_interrupt(dev); + + /* drop the spinlock */ + spin_unlock_irqrestore(&dev->lock, flags); + + /* wait for the FIFO to empty enough */ + wait_event_interruptible(dev->tx_queue, (fifo_avail = ITE_TX_FIFO_LEN - dev->params.get_tx_used_slots(dev)) >= 8); + + /* get the spinlock again */ + spin_lock_irqsave(&dev->lock, flags); + + /* disable the tx interrupt again. */ + dev->params. + disable_tx_interrupt(dev); + } + + /* now send the byte through the FIFO */ + dev->params.put_tx_byte(dev, val); + fifo_avail--; + } + } + + /* wait and don't return until the whole FIFO has been sent out; + * otherwise we could configure the RX carrier params instead of the + * TX ones while the transmission is still being performed! */ + fifo_remaining = dev->params.get_tx_used_slots(dev); + remaining_us = 0; + while (fifo_remaining > 0) { + fifo_remaining--; + last_idx--; + last_idx &= (ITE_TX_FIFO_LEN - 1); + remaining_us += last_sent[last_idx]; + } + remaining_us = (remaining_us * max_rle_us) / (ITE_TX_MAX_RLE); + + /* drop the spinlock while we sleep */ + spin_unlock_irqrestore(&dev->lock, flags); + + /* sleep remaining_us microseconds */ + mdelay(DIV_ROUND_UP(remaining_us, 1000)); + + /* reacquire the spinlock */ + spin_lock_irqsave(&dev->lock, flags); + + /* now we're not transmitting anymore */ + dev->transmitting = false; + + /* and set the carrier values for reception */ + ite_set_carrier_params(dev); + + /* reenable the receiver */ + if (dev->in_use) + dev->params.enable_rx(dev); + + /* notify transmission end */ + wake_up_interruptible(&dev->tx_ended); + + spin_unlock_irqrestore(&dev->lock, flags); + + return ret; +} + +/* idle the receiver if needed */ +static void ite_s_idle(struct rc_dev *rcdev, bool enable) +{ + unsigned long flags; + struct ite_dev *dev = rcdev->priv; + + ite_dbg("%s called", __func__); + + if (enable) { + spin_lock_irqsave(&dev->lock, flags); + dev->params.idle_rx(dev); + spin_unlock_irqrestore(&dev->lock, flags); + } +} + + +/* IT8712F HW-specific functions */ + +/* retrieve a bitmask of the current causes for a pending interrupt; this may + * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN + * */ +static int it87_get_irq_causes(struct ite_dev *dev) +{ + u8 iflags; + int ret = 0; + + ite_dbg("%s called", __func__); + + /* read the interrupt flags */ + iflags = inb(dev->cir_addr + IT87_IIR) & IT87_II; + + switch (iflags) { + case IT87_II_RXDS: + ret = ITE_IRQ_RX_FIFO; + break; + case IT87_II_RXFO: + ret = ITE_IRQ_RX_FIFO_OVERRUN; + break; + case IT87_II_TXLDL: + ret = ITE_IRQ_TX_FIFO; + break; + } + + return ret; +} + +/* set the carrier parameters; to be called with the spinlock held */ +static void it87_set_carrier_params(struct ite_dev *dev, bool high_freq, + bool use_demodulator, + u8 carrier_freq_bits, u8 allowance_bits, + u8 pulse_width_bits) +{ + u8 val; + + ite_dbg("%s called", __func__); + + /* program the RCR register */ + val = inb(dev->cir_addr + IT87_RCR) + & ~(IT87_HCFS | IT87_RXEND | IT87_RXDCR); + + if (high_freq) + val |= IT87_HCFS; + + if (use_demodulator) + val |= IT87_RXEND; + + val |= allowance_bits; + + outb(val, dev->cir_addr + IT87_RCR); + + /* program the TCR2 register */ + outb((carrier_freq_bits << IT87_CFQ_SHIFT) | pulse_width_bits, + dev->cir_addr + IT87_TCR2); +} + +/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock + * held */ +static int it87_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) +{ + int fifo, read = 0; + + ite_dbg("%s called", __func__); + + /* read how many bytes are still in the FIFO */ + fifo = inb(dev->cir_addr + IT87_RSR) & IT87_RXFBC; + + while (fifo > 0 && buf_size > 0) { + *(buf++) = inb(dev->cir_addr + IT87_DR); + fifo--; + read++; + buf_size--; + } + + return read; +} + +/* return how many bytes are still in the FIFO; this will be called + * with the device spinlock NOT HELD while waiting for the TX FIFO to get + * empty; let's expect this won't be a problem */ +static int it87_get_tx_used_slots(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + return inb(dev->cir_addr + IT87_TSR) & IT87_TXFBC; +} + +/* put a byte to the TX fifo; this should be called with the spinlock held */ +static void it87_put_tx_byte(struct ite_dev *dev, u8 value) +{ + outb(value, dev->cir_addr + IT87_DR); +} + +/* idle the receiver so that we won't receive samples until another + pulse is detected; this must be called with the device spinlock held */ +static void it87_idle_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable streaming by clearing RXACT writing it as 1 */ + outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXACT, + dev->cir_addr + IT87_RCR); + + /* clear the FIFO */ + outb(inb(dev->cir_addr + IT87_TCR1) | IT87_FIFOCLR, + dev->cir_addr + IT87_TCR1); +} + +/* disable the receiver; this must be called with the device spinlock held */ +static void it87_disable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the receiver interrupts */ + outb(inb(dev->cir_addr + IT87_IER) & ~(IT87_RDAIE | IT87_RFOIE), + dev->cir_addr + IT87_IER); + + /* disable the receiver */ + outb(inb(dev->cir_addr + IT87_RCR) & ~IT87_RXEN, + dev->cir_addr + IT87_RCR); + + /* clear the FIFO and RXACT (actually RXACT should have been cleared + * in the previous outb() call) */ + it87_idle_rx(dev); +} + +/* enable the receiver; this must be called with the device spinlock held */ +static void it87_enable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the receiver by setting RXEN */ + outb(inb(dev->cir_addr + IT87_RCR) | IT87_RXEN, + dev->cir_addr + IT87_RCR); + + /* just prepare it to idle for the next reception */ + it87_idle_rx(dev); + + /* enable the receiver interrupts and master enable flag */ + outb(inb(dev->cir_addr + IT87_IER) | IT87_RDAIE | IT87_RFOIE | IT87_IEC, + dev->cir_addr + IT87_IER); +} + +/* disable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it87_disable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the transmitter interrupts */ + outb(inb(dev->cir_addr + IT87_IER) & ~IT87_TLDLIE, + dev->cir_addr + IT87_IER); +} + +/* enable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it87_enable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the transmitter interrupts and master enable flag */ + outb(inb(dev->cir_addr + IT87_IER) | IT87_TLDLIE | IT87_IEC, + dev->cir_addr + IT87_IER); +} + +/* disable the device; this must be called with the device spinlock held */ +static void it87_disable(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* clear out all interrupt enable flags */ + outb(inb(dev->cir_addr + IT87_IER) & + ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE), + dev->cir_addr + IT87_IER); + + /* disable the receiver */ + it87_disable_rx(dev); + + /* erase the FIFO */ + outb(IT87_FIFOCLR | inb(dev->cir_addr + IT87_TCR1), + dev->cir_addr + IT87_TCR1); +} + +/* initialize the hardware */ +static void it87_init_hardware(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable just the baud rate divisor register, + disabling all the interrupts at the same time */ + outb((inb(dev->cir_addr + IT87_IER) & + ~(IT87_IEC | IT87_RFOIE | IT87_RDAIE | IT87_TLDLIE)) | IT87_BR, + dev->cir_addr + IT87_IER); + + /* write out the baud rate divisor */ + outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT87_BDLR); + outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, dev->cir_addr + IT87_BDHR); + + /* disable the baud rate divisor register again */ + outb(inb(dev->cir_addr + IT87_IER) & ~IT87_BR, + dev->cir_addr + IT87_IER); + + /* program the RCR register defaults */ + outb(ITE_RXDCR_DEFAULT, dev->cir_addr + IT87_RCR); + + /* program the TCR1 register */ + outb(IT87_TXMPM_DEFAULT | IT87_TXENDF | IT87_TXRLE + | IT87_FIFOTL_DEFAULT | IT87_FIFOCLR, + dev->cir_addr + IT87_TCR1); + + /* program the carrier parameters */ + ite_set_carrier_params(dev); +} + +/* IT8512F on ITE8708 HW-specific functions */ + +/* retrieve a bitmask of the current causes for a pending interrupt; this may + * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN + * */ +static int it8708_get_irq_causes(struct ite_dev *dev) +{ + u8 iflags; + int ret = 0; + + ite_dbg("%s called", __func__); + + /* read the interrupt flags */ + iflags = inb(dev->cir_addr + IT8708_C0IIR); + + if (iflags & IT85_TLDLI) + ret |= ITE_IRQ_TX_FIFO; + if (iflags & IT85_RDAI) + ret |= ITE_IRQ_RX_FIFO; + if (iflags & IT85_RFOI) + ret |= ITE_IRQ_RX_FIFO_OVERRUN; + + return ret; +} + +/* set the carrier parameters; to be called with the spinlock held */ +static void it8708_set_carrier_params(struct ite_dev *dev, bool high_freq, + bool use_demodulator, + u8 carrier_freq_bits, u8 allowance_bits, + u8 pulse_width_bits) +{ + u8 val; + + ite_dbg("%s called", __func__); + + /* program the C0CFR register, with HRAE=1 */ + outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE, + dev->cir_addr + IT8708_BANKSEL); + + val = (inb(dev->cir_addr + IT8708_C0CFR) + & ~(IT85_HCFS | IT85_CFQ)) | carrier_freq_bits; + + if (high_freq) + val |= IT85_HCFS; + + outb(val, dev->cir_addr + IT8708_C0CFR); + + outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE, + dev->cir_addr + IT8708_BANKSEL); + + /* program the C0RCR register */ + val = inb(dev->cir_addr + IT8708_C0RCR) + & ~(IT85_RXEND | IT85_RXDCR); + + if (use_demodulator) + val |= IT85_RXEND; + + val |= allowance_bits; + + outb(val, dev->cir_addr + IT8708_C0RCR); + + /* program the C0TCR register */ + val = inb(dev->cir_addr + IT8708_C0TCR) & ~IT85_TXMPW; + val |= pulse_width_bits; + outb(val, dev->cir_addr + IT8708_C0TCR); +} + +/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock + * held */ +static int it8708_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) +{ + int fifo, read = 0; + + ite_dbg("%s called", __func__); + + /* read how many bytes are still in the FIFO */ + fifo = inb(dev->cir_addr + IT8708_C0RFSR) & IT85_RXFBC; + + while (fifo > 0 && buf_size > 0) { + *(buf++) = inb(dev->cir_addr + IT8708_C0DR); + fifo--; + read++; + buf_size--; + } + + return read; +} + +/* return how many bytes are still in the FIFO; this will be called + * with the device spinlock NOT HELD while waiting for the TX FIFO to get + * empty; let's expect this won't be a problem */ +static int it8708_get_tx_used_slots(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + return inb(dev->cir_addr + IT8708_C0TFSR) & IT85_TXFBC; +} + +/* put a byte to the TX fifo; this should be called with the spinlock held */ +static void it8708_put_tx_byte(struct ite_dev *dev, u8 value) +{ + outb(value, dev->cir_addr + IT8708_C0DR); +} + +/* idle the receiver so that we won't receive samples until another + pulse is detected; this must be called with the device spinlock held */ +static void it8708_idle_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable streaming by clearing RXACT writing it as 1 */ + outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXACT, + dev->cir_addr + IT8708_C0RCR); + + /* clear the FIFO */ + outb(inb(dev->cir_addr + IT8708_C0MSTCR) | IT85_FIFOCLR, + dev->cir_addr + IT8708_C0MSTCR); +} + +/* disable the receiver; this must be called with the device spinlock held */ +static void it8708_disable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the receiver interrupts */ + outb(inb(dev->cir_addr + IT8708_C0IER) & + ~(IT85_RDAIE | IT85_RFOIE), + dev->cir_addr + IT8708_C0IER); + + /* disable the receiver */ + outb(inb(dev->cir_addr + IT8708_C0RCR) & ~IT85_RXEN, + dev->cir_addr + IT8708_C0RCR); + + /* clear the FIFO and RXACT (actually RXACT should have been cleared + * in the previous outb() call) */ + it8708_idle_rx(dev); +} + +/* enable the receiver; this must be called with the device spinlock held */ +static void it8708_enable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the receiver by setting RXEN */ + outb(inb(dev->cir_addr + IT8708_C0RCR) | IT85_RXEN, + dev->cir_addr + IT8708_C0RCR); + + /* just prepare it to idle for the next reception */ + it8708_idle_rx(dev); + + /* enable the receiver interrupts and master enable flag */ + outb(inb(dev->cir_addr + IT8708_C0IER) + |IT85_RDAIE | IT85_RFOIE | IT85_IEC, + dev->cir_addr + IT8708_C0IER); +} + +/* disable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it8708_disable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the transmitter interrupts */ + outb(inb(dev->cir_addr + IT8708_C0IER) & ~IT85_TLDLIE, + dev->cir_addr + IT8708_C0IER); +} + +/* enable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it8708_enable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the transmitter interrupts and master enable flag */ + outb(inb(dev->cir_addr + IT8708_C0IER) + |IT85_TLDLIE | IT85_IEC, + dev->cir_addr + IT8708_C0IER); +} + +/* disable the device; this must be called with the device spinlock held */ +static void it8708_disable(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* clear out all interrupt enable flags */ + outb(inb(dev->cir_addr + IT8708_C0IER) & + ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), + dev->cir_addr + IT8708_C0IER); + + /* disable the receiver */ + it8708_disable_rx(dev); + + /* erase the FIFO */ + outb(IT85_FIFOCLR | inb(dev->cir_addr + IT8708_C0MSTCR), + dev->cir_addr + IT8708_C0MSTCR); +} + +/* initialize the hardware */ +static void it8708_init_hardware(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable all the interrupts */ + outb(inb(dev->cir_addr + IT8708_C0IER) & + ~(IT85_IEC | IT85_RFOIE | IT85_RDAIE | IT85_TLDLIE), + dev->cir_addr + IT8708_C0IER); + + /* program the baud rate divisor */ + outb(inb(dev->cir_addr + IT8708_BANKSEL) | IT8708_HRAE, + dev->cir_addr + IT8708_BANKSEL); + + outb(ITE_BAUDRATE_DIVISOR & 0xff, dev->cir_addr + IT8708_C0BDLR); + outb((ITE_BAUDRATE_DIVISOR >> 8) & 0xff, + dev->cir_addr + IT8708_C0BDHR); + + outb(inb(dev->cir_addr + IT8708_BANKSEL) & ~IT8708_HRAE, + dev->cir_addr + IT8708_BANKSEL); + + /* program the C0MSTCR register defaults */ + outb((inb(dev->cir_addr + IT8708_C0MSTCR) & + ~(IT85_ILSEL | IT85_ILE | IT85_FIFOTL | + IT85_FIFOCLR | IT85_RESET)) | + IT85_FIFOTL_DEFAULT, + dev->cir_addr + IT8708_C0MSTCR); + + /* program the C0RCR register defaults */ + outb((inb(dev->cir_addr + IT8708_C0RCR) & + ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND | + IT85_RXACT | IT85_RXDCR)) | + ITE_RXDCR_DEFAULT, + dev->cir_addr + IT8708_C0RCR); + + /* program the C0TCR register defaults */ + outb((inb(dev->cir_addr + IT8708_C0TCR) & + ~(IT85_TXMPM | IT85_TXMPW)) + |IT85_TXRLE | IT85_TXENDF | + IT85_TXMPM_DEFAULT | IT85_TXMPW_DEFAULT, + dev->cir_addr + IT8708_C0TCR); + + /* program the carrier parameters */ + ite_set_carrier_params(dev); +} + +/* IT8512F on ITE8709 HW-specific functions */ + +/* read a byte from the SRAM module */ +static inline u8 it8709_rm(struct ite_dev *dev, int index) +{ + outb(index, dev->cir_addr + IT8709_RAM_IDX); + return inb(dev->cir_addr + IT8709_RAM_VAL); +} + +/* write a byte to the SRAM module */ +static inline void it8709_wm(struct ite_dev *dev, u8 val, int index) +{ + outb(index, dev->cir_addr + IT8709_RAM_IDX); + outb(val, dev->cir_addr + IT8709_RAM_VAL); +} + +static void it8709_wait(struct ite_dev *dev) +{ + int i = 0; + /* + * loop until device tells it's ready to continue + * iterations count is usually ~750 but can sometimes achieve 13000 + */ + for (i = 0; i < 15000; i++) { + udelay(2); + if (it8709_rm(dev, IT8709_MODE) == IT8709_IDLE) + break; + } +} + +/* read the value of a CIR register */ +static u8 it8709_rr(struct ite_dev *dev, int index) +{ + /* just wait in case the previous access was a write */ + it8709_wait(dev); + it8709_wm(dev, index, IT8709_REG_IDX); + it8709_wm(dev, IT8709_READ, IT8709_MODE); + + /* wait for the read data to be available */ + it8709_wait(dev); + + /* return the read value */ + return it8709_rm(dev, IT8709_REG_VAL); +} + +/* write the value of a CIR register */ +static void it8709_wr(struct ite_dev *dev, u8 val, int index) +{ + /* we wait before writing, and not afterwards, since this allows us to + * pipeline the host CPU with the microcontroller */ + it8709_wait(dev); + it8709_wm(dev, val, IT8709_REG_VAL); + it8709_wm(dev, index, IT8709_REG_IDX); + it8709_wm(dev, IT8709_WRITE, IT8709_MODE); +} + +/* retrieve a bitmask of the current causes for a pending interrupt; this may + * be composed of ITE_IRQ_TX_FIFO, ITE_IRQ_RX_FIFO and ITE_IRQ_RX_FIFO_OVERRUN + * */ +static int it8709_get_irq_causes(struct ite_dev *dev) +{ + u8 iflags; + int ret = 0; + + ite_dbg("%s called", __func__); + + /* read the interrupt flags */ + iflags = it8709_rm(dev, IT8709_IIR); + + if (iflags & IT85_TLDLI) + ret |= ITE_IRQ_TX_FIFO; + if (iflags & IT85_RDAI) + ret |= ITE_IRQ_RX_FIFO; + if (iflags & IT85_RFOI) + ret |= ITE_IRQ_RX_FIFO_OVERRUN; + + return ret; +} + +/* set the carrier parameters; to be called with the spinlock held */ +static void it8709_set_carrier_params(struct ite_dev *dev, bool high_freq, + bool use_demodulator, + u8 carrier_freq_bits, u8 allowance_bits, + u8 pulse_width_bits) +{ + u8 val; + + ite_dbg("%s called", __func__); + + val = (it8709_rr(dev, IT85_C0CFR) + &~(IT85_HCFS | IT85_CFQ)) | + carrier_freq_bits; + + if (high_freq) + val |= IT85_HCFS; + + it8709_wr(dev, val, IT85_C0CFR); + + /* program the C0RCR register */ + val = it8709_rr(dev, IT85_C0RCR) + & ~(IT85_RXEND | IT85_RXDCR); + + if (use_demodulator) + val |= IT85_RXEND; + + val |= allowance_bits; + + it8709_wr(dev, val, IT85_C0RCR); + + /* program the C0TCR register */ + val = it8709_rr(dev, IT85_C0TCR) & ~IT85_TXMPW; + val |= pulse_width_bits; + it8709_wr(dev, val, IT85_C0TCR); +} + +/* read up to buf_size bytes from the RX FIFO; to be called with the spinlock + * held */ +static int it8709_get_rx_bytes(struct ite_dev *dev, u8 * buf, int buf_size) +{ + int fifo, read = 0; + + ite_dbg("%s called", __func__); + + /* read how many bytes are still in the FIFO */ + fifo = it8709_rm(dev, IT8709_RFSR) & IT85_RXFBC; + + while (fifo > 0 && buf_size > 0) { + *(buf++) = it8709_rm(dev, IT8709_FIFO + read); + fifo--; + read++; + buf_size--; + } + + /* 'clear' the FIFO by setting the writing index to 0; this is + * completely bound to be racy, but we can't help it, since it's a + * limitation of the protocol */ + it8709_wm(dev, 0, IT8709_RFSR); + + return read; +} + +/* return how many bytes are still in the FIFO; this will be called + * with the device spinlock NOT HELD while waiting for the TX FIFO to get + * empty; let's expect this won't be a problem */ +static int it8709_get_tx_used_slots(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + return it8709_rr(dev, IT85_C0TFSR) & IT85_TXFBC; +} + +/* put a byte to the TX fifo; this should be called with the spinlock held */ +static void it8709_put_tx_byte(struct ite_dev *dev, u8 value) +{ + it8709_wr(dev, value, IT85_C0DR); +} + +/* idle the receiver so that we won't receive samples until another + pulse is detected; this must be called with the device spinlock held */ +static void it8709_idle_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable streaming by clearing RXACT writing it as 1 */ + it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXACT, + IT85_C0RCR); + + /* clear the FIFO */ + it8709_wr(dev, it8709_rr(dev, IT85_C0MSTCR) | IT85_FIFOCLR, + IT85_C0MSTCR); +} + +/* disable the receiver; this must be called with the device spinlock held */ +static void it8709_disable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the receiver interrupts */ + it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & + ~(IT85_RDAIE | IT85_RFOIE), + IT85_C0IER); + + /* disable the receiver */ + it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) & ~IT85_RXEN, + IT85_C0RCR); + + /* clear the FIFO and RXACT (actually RXACT should have been cleared + * in the previous it8709_wr(dev, ) call) */ + it8709_idle_rx(dev); +} + +/* enable the receiver; this must be called with the device spinlock held */ +static void it8709_enable_rx(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the receiver by setting RXEN */ + it8709_wr(dev, it8709_rr(dev, IT85_C0RCR) | IT85_RXEN, + IT85_C0RCR); + + /* just prepare it to idle for the next reception */ + it8709_idle_rx(dev); + + /* enable the receiver interrupts and master enable flag */ + it8709_wr(dev, it8709_rr(dev, IT85_C0IER) + |IT85_RDAIE | IT85_RFOIE | IT85_IEC, + IT85_C0IER); +} + +/* disable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it8709_disable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable the transmitter interrupts */ + it8709_wr(dev, it8709_rr(dev, IT85_C0IER) & ~IT85_TLDLIE, + IT85_C0IER); +} + +/* enable the transmitter interrupt; this must be called with the device + * spinlock held */ +static void it8709_enable_tx_interrupt(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* enable the transmitter interrupts and master enable flag */ + it8709_wr(dev, it8709_rr(dev, IT85_C0IER) + |IT85_TLDLIE | IT85_IEC, + IT85_C0IER); +} + +/* disable the device; this must be called with the device spinlock held */ +static void it8709_disable(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* clear out all interrupt enable flags */ + it8709_wr(dev, + it8709_rr(dev, + IT85_C0IER) & ~(IT85_IEC | IT85_RFOIE | + IT85_RDAIE | + IT85_TLDLIE), IT85_C0IER); + + /* disable the receiver */ + it8709_disable_rx(dev); + + /* erase the FIFO */ + it8709_wr(dev, IT85_FIFOCLR | it8709_rr(dev, IT85_C0MSTCR), + IT85_C0MSTCR); +} + +/* initialize the hardware */ +static void it8709_init_hardware(struct ite_dev *dev) +{ + ite_dbg("%s called", __func__); + + /* disable all the interrupts */ + it8709_wr(dev, + it8709_rr(dev, + IT85_C0IER) & ~(IT85_IEC | IT85_RFOIE | + IT85_RDAIE | + IT85_TLDLIE), IT85_C0IER); + + /* program the baud rate divisor */ + it8709_wr(dev, ITE_BAUDRATE_DIVISOR & 0xff, IT85_C0BDLR); + it8709_wr(dev, (ITE_BAUDRATE_DIVISOR >> 8) & 0xff, + IT85_C0BDHR); + + /* program the C0MSTCR register defaults */ + it8709_wr(dev, (it8709_rr(dev, IT85_C0MSTCR) & ~(IT85_ILSEL | + IT85_ILE + | IT85_FIFOTL + | + IT85_FIFOCLR + | + IT85_RESET)) + | IT85_FIFOTL_DEFAULT, IT85_C0MSTCR); + + /* program the C0RCR register defaults */ + it8709_wr(dev, + (it8709_rr(dev, IT85_C0RCR) & + ~(IT85_RXEN | IT85_RDWOS | IT85_RXEND + | IT85_RXACT | IT85_RXDCR)) | + ITE_RXDCR_DEFAULT, IT85_C0RCR); + + /* program the C0TCR register defaults */ + it8709_wr(dev, (it8709_rr(dev, IT85_C0TCR) + &~(IT85_TXMPM | IT85_TXMPW)) + |IT85_TXRLE | IT85_TXENDF | + IT85_TXMPM_DEFAULT | + IT85_TXMPW_DEFAULT, IT85_C0TCR); + + /* program the carrier parameters */ + ite_set_carrier_params(dev); +} + + +/* generic hardware setup/teardown code */ + +/* activate the device for use */ +static int ite_open(struct rc_dev *rcdev) +{ + struct ite_dev *dev = rcdev->priv; + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + dev->in_use = true; + + /* enable the receiver */ + dev->params.enable_rx(dev); + + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/* deactivate the device for use */ +static void ite_close(struct rc_dev *rcdev) +{ + struct ite_dev *dev = rcdev->priv; + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + dev->in_use = false; + + /* wait for any transmission to end */ + spin_unlock_irqrestore(&dev->lock, flags); + wait_event_interruptible(dev->tx_ended, !dev->transmitting); + spin_lock_irqsave(&dev->lock, flags); + + dev->params.disable(dev); + + spin_unlock_irqrestore(&dev->lock, flags); +} + +/* supported models and their parameters */ +static const struct ite_dev_params ite_dev_descs[] = { + { /* 0: ITE8704 */ + .model = "ITE8704 CIR transceiver", + .io_region_size = IT87_IOREG_LENGTH, + .hw_tx_capable = true, + .sample_period = (u32) (1000000000ULL / 115200), + .tx_carrier_freq = 38000, + .tx_duty_cycle = 33, + .rx_low_carrier_freq = 0, + .rx_high_carrier_freq = 0, + + /* operations */ + .get_irq_causes = it87_get_irq_causes, + .enable_rx = it87_enable_rx, + .idle_rx = it87_idle_rx, + .disable_rx = it87_idle_rx, + .get_rx_bytes = it87_get_rx_bytes, + .enable_tx_interrupt = it87_enable_tx_interrupt, + .disable_tx_interrupt = it87_disable_tx_interrupt, + .get_tx_used_slots = it87_get_tx_used_slots, + .put_tx_byte = it87_put_tx_byte, + .disable = it87_disable, + .init_hardware = it87_init_hardware, + .set_carrier_params = it87_set_carrier_params, + }, + { /* 1: ITE8713 */ + .model = "ITE8713 CIR transceiver", + .io_region_size = IT87_IOREG_LENGTH, + .hw_tx_capable = true, + .sample_period = (u32) (1000000000ULL / 115200), + .tx_carrier_freq = 38000, + .tx_duty_cycle = 33, + .rx_low_carrier_freq = 0, + .rx_high_carrier_freq = 0, + + /* operations */ + .get_irq_causes = it87_get_irq_causes, + .enable_rx = it87_enable_rx, + .idle_rx = it87_idle_rx, + .disable_rx = it87_idle_rx, + .get_rx_bytes = it87_get_rx_bytes, + .enable_tx_interrupt = it87_enable_tx_interrupt, + .disable_tx_interrupt = it87_disable_tx_interrupt, + .get_tx_used_slots = it87_get_tx_used_slots, + .put_tx_byte = it87_put_tx_byte, + .disable = it87_disable, + .init_hardware = it87_init_hardware, + .set_carrier_params = it87_set_carrier_params, + }, + { /* 2: ITE8708 */ + .model = "ITE8708 CIR transceiver", + .io_region_size = IT8708_IOREG_LENGTH, + .hw_tx_capable = true, + .sample_period = (u32) (1000000000ULL / 115200), + .tx_carrier_freq = 38000, + .tx_duty_cycle = 33, + .rx_low_carrier_freq = 0, + .rx_high_carrier_freq = 0, + + /* operations */ + .get_irq_causes = it8708_get_irq_causes, + .enable_rx = it8708_enable_rx, + .idle_rx = it8708_idle_rx, + .disable_rx = it8708_idle_rx, + .get_rx_bytes = it8708_get_rx_bytes, + .enable_tx_interrupt = it8708_enable_tx_interrupt, + .disable_tx_interrupt = + it8708_disable_tx_interrupt, + .get_tx_used_slots = it8708_get_tx_used_slots, + .put_tx_byte = it8708_put_tx_byte, + .disable = it8708_disable, + .init_hardware = it8708_init_hardware, + .set_carrier_params = it8708_set_carrier_params, + }, + { /* 3: ITE8709 */ + .model = "ITE8709 CIR transceiver", + .io_region_size = IT8709_IOREG_LENGTH, + .hw_tx_capable = true, + .sample_period = (u32) (1000000000ULL / 115200), + .tx_carrier_freq = 38000, + .tx_duty_cycle = 33, + .rx_low_carrier_freq = 0, + .rx_high_carrier_freq = 0, + + /* operations */ + .get_irq_causes = it8709_get_irq_causes, + .enable_rx = it8709_enable_rx, + .idle_rx = it8709_idle_rx, + .disable_rx = it8709_idle_rx, + .get_rx_bytes = it8709_get_rx_bytes, + .enable_tx_interrupt = it8709_enable_tx_interrupt, + .disable_tx_interrupt = + it8709_disable_tx_interrupt, + .get_tx_used_slots = it8709_get_tx_used_slots, + .put_tx_byte = it8709_put_tx_byte, + .disable = it8709_disable, + .init_hardware = it8709_init_hardware, + .set_carrier_params = it8709_set_carrier_params, + }, +}; + +static const struct pnp_device_id ite_ids[] = { + {"ITE8704", 0}, /* Default model */ + {"ITE8713", 1}, /* CIR found in EEEBox 1501U */ + {"ITE8708", 2}, /* Bridged IT8512 */ + {"ITE8709", 3}, /* SRAM-Bridged IT8512 */ + {"", 0}, +}; + +/* allocate memory, probe hardware, and initialize everything */ +static int ite_probe(struct pnp_dev *pdev, const struct pnp_device_id + *dev_id) +{ + const struct ite_dev_params *dev_desc = NULL; + struct ite_dev *itdev = NULL; + struct rc_dev *rdev = NULL; + int ret = -ENOMEM; + int model_no; + + ite_dbg("%s called", __func__); + + itdev = kzalloc(sizeof(struct ite_dev), GFP_KERNEL); + if (!itdev) + return ret; + + /* input device for IR remote (and tx) */ + rdev = rc_allocate_device(); + if (!rdev) + goto failure; + + ret = -ENODEV; + + /* get the model number */ + model_no = (int)dev_id->driver_data; + ite_pr(KERN_NOTICE, "Auto-detected model: %s\n", + ite_dev_descs[model_no].model); + + if (model_number >= 0 && model_number < ARRAY_SIZE(ite_dev_descs)) { + model_no = model_number; + ite_pr(KERN_NOTICE, "The model has been fixed by a module " + "parameter."); + } + + ite_pr(KERN_NOTICE, "Using model: %s\n", ite_dev_descs[model_no].model); + + /* get the description for the device */ + dev_desc = &ite_dev_descs[model_no]; + + /* validate pnp resources */ + if (!pnp_port_valid(pdev, 0) || + pnp_port_len(pdev, 0) != dev_desc->io_region_size) { + dev_err(&pdev->dev, "IR PNP Port not valid!\n"); + goto failure; + } + + if (!pnp_irq_valid(pdev, 0)) { + dev_err(&pdev->dev, "PNP IRQ not valid!\n"); + goto failure; + } + + /* store resource values */ + itdev->cir_addr = pnp_port_start(pdev, 0); + itdev->cir_irq = pnp_irq(pdev, 0); + + /* initialize spinlocks */ + spin_lock_init(&itdev->lock); + + /* initialize raw event */ + init_ir_raw_event(&itdev->rawir); + + ret = -EBUSY; + /* now claim resources */ + if (!request_region(itdev->cir_addr, + dev_desc->io_region_size, ITE_DRIVER_NAME)) + goto failure; + + if (request_irq(itdev->cir_irq, ite_cir_isr, IRQF_SHARED, + ITE_DRIVER_NAME, (void *)itdev)) + goto failure; + + /* set driver data into the pnp device */ + pnp_set_drvdata(pdev, itdev); + itdev->pdev = pdev; + + /* initialize waitqueues for transmission */ + init_waitqueue_head(&itdev->tx_queue); + init_waitqueue_head(&itdev->tx_ended); + + /* copy model-specific parameters */ + itdev->params = *dev_desc; + + /* apply any overrides */ + if (sample_period > 0) + itdev->params.sample_period = sample_period; + + if (tx_carrier_freq > 0) + itdev->params.tx_carrier_freq = tx_carrier_freq; + + if (tx_duty_cycle > 0 && tx_duty_cycle <= 100) + itdev->params.tx_duty_cycle = tx_duty_cycle; + + if (rx_low_carrier_freq > 0) + itdev->params.rx_low_carrier_freq = rx_low_carrier_freq; + + if (rx_high_carrier_freq > 0) + itdev->params.rx_high_carrier_freq = rx_high_carrier_freq; + + /* print out parameters */ + ite_pr(KERN_NOTICE, "TX-capable: %d\n", (int) + itdev->params.hw_tx_capable); + ite_pr(KERN_NOTICE, "Sample period (ns): %ld\n", (long) + itdev->params.sample_period); + ite_pr(KERN_NOTICE, "TX carrier frequency (Hz): %d\n", (int) + itdev->params.tx_carrier_freq); + ite_pr(KERN_NOTICE, "TX duty cycle (%%): %d\n", (int) + itdev->params.tx_duty_cycle); + ite_pr(KERN_NOTICE, "RX low carrier frequency (Hz): %d\n", (int) + itdev->params.rx_low_carrier_freq); + ite_pr(KERN_NOTICE, "RX high carrier frequency (Hz): %d\n", (int) + itdev->params.rx_high_carrier_freq); + + /* set up hardware initial state */ + itdev->params.init_hardware(itdev); + + /* set up ir-core props */ + rdev->priv = itdev; + rdev->driver_type = RC_DRIVER_IR_RAW; + rdev->allowed_protos = RC_TYPE_ALL; + rdev->open = ite_open; + rdev->close = ite_close; + rdev->s_idle = ite_s_idle; + rdev->s_rx_carrier_range = ite_set_rx_carrier_range; + rdev->min_timeout = ITE_MIN_IDLE_TIMEOUT; + rdev->max_timeout = ITE_MAX_IDLE_TIMEOUT; + rdev->timeout = ITE_IDLE_TIMEOUT; + rdev->rx_resolution = ITE_BAUDRATE_DIVISOR * + itdev->params.sample_period; + rdev->tx_resolution = ITE_BAUDRATE_DIVISOR * + itdev->params.sample_period; + + /* set up transmitter related values if needed */ + if (itdev->params.hw_tx_capable) { + rdev->tx_ir = ite_tx_ir; + rdev->s_tx_carrier = ite_set_tx_carrier; + rdev->s_tx_duty_cycle = ite_set_tx_duty_cycle; + } + + rdev->input_name = dev_desc->model; + rdev->input_id.bustype = BUS_HOST; + rdev->input_id.vendor = PCI_VENDOR_ID_ITE; + rdev->input_id.product = 0; + rdev->input_id.version = 0; + rdev->driver_name = ITE_DRIVER_NAME; + rdev->map_name = RC_MAP_RC6_MCE; + + ret = rc_register_device(rdev); + if (ret) + goto failure; + + itdev->rdev = rdev; + ite_pr(KERN_NOTICE, "driver has been successfully loaded\n"); + + return 0; + +failure: + if (itdev->cir_irq) + free_irq(itdev->cir_irq, itdev); + + if (itdev->cir_addr) + release_region(itdev->cir_addr, itdev->params.io_region_size); + + rc_free_device(rdev); + kfree(itdev); + + return ret; +} + +static void __devexit ite_remove(struct pnp_dev *pdev) +{ + struct ite_dev *dev = pnp_get_drvdata(pdev); + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + + /* disable hardware */ + dev->params.disable(dev); + + spin_unlock_irqrestore(&dev->lock, flags); + + /* free resources */ + free_irq(dev->cir_irq, dev); + release_region(dev->cir_addr, dev->params.io_region_size); + + rc_unregister_device(dev->rdev); + + kfree(dev); +} + +static int ite_suspend(struct pnp_dev *pdev, pm_message_t state) +{ + struct ite_dev *dev = pnp_get_drvdata(pdev); + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + + /* disable all interrupts */ + dev->params.disable(dev); + + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +static int ite_resume(struct pnp_dev *pdev) +{ + int ret = 0; + struct ite_dev *dev = pnp_get_drvdata(pdev); + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + + if (dev->transmitting) { + /* wake up the transmitter */ + wake_up_interruptible(&dev->tx_queue); + } else { + /* enable the receiver */ + dev->params.enable_rx(dev); + } + + spin_unlock_irqrestore(&dev->lock, flags); + + return ret; +} + +static void ite_shutdown(struct pnp_dev *pdev) +{ + struct ite_dev *dev = pnp_get_drvdata(pdev); + unsigned long flags; + + ite_dbg("%s called", __func__); + + spin_lock_irqsave(&dev->lock, flags); + + /* disable all interrupts */ + dev->params.disable(dev); + + spin_unlock_irqrestore(&dev->lock, flags); +} + +static struct pnp_driver ite_driver = { + .name = ITE_DRIVER_NAME, + .id_table = ite_ids, + .probe = ite_probe, + .remove = __devexit_p(ite_remove), + .suspend = ite_suspend, + .resume = ite_resume, + .shutdown = ite_shutdown, +}; + +int ite_init(void) +{ + return pnp_register_driver(&ite_driver); +} + +void ite_exit(void) +{ + pnp_unregister_driver(&ite_driver); +} + +MODULE_DEVICE_TABLE(pnp, ite_ids); +MODULE_DESCRIPTION("ITE Tech Inc. IT8712F/ITE8512F CIR driver"); + +MODULE_AUTHOR("Juan J. Garcia de Soria <skandalfo@gmail.com>"); +MODULE_LICENSE("GPL"); + +module_init(ite_init); +module_exit(ite_exit); |
