diff options
author | David Härdeman <david@hardeman.nu> | 2011-04-28 19:13:22 +0400 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-05-20 16:29:51 +0400 |
commit | c829f2672f312f2c19dc021b233a45d3dd850a4f (patch) | |
tree | 3d74712f745ea3061c947bc9f00d4f9eef42be6b /drivers/media/rc | |
parent | 67cdd42e0630eff3673808aa57007501353c73b6 (diff) | |
download | linux-c829f2672f312f2c19dc021b233a45d3dd850a4f.tar.xz |
[media] rc-core: add TX support to the winbond-cir driver
This patch adds preliminary IR TX capabilities to the
winbond-cir driver.
Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/rc')
-rw-r--r-- | drivers/media/rc/winbond-cir.c | 432 |
1 files changed, 357 insertions, 75 deletions
diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c index c7686ca81a6b..c42a8ed36c92 100644 --- a/drivers/media/rc/winbond-cir.c +++ b/drivers/media/rc/winbond-cir.c @@ -19,11 +19,12 @@ * o DSDT dumps * * Supported features: + * o IR Receive + * o IR Transmit * o Wake-On-CIR functionality * * To do: * o Learning - * o IR Transmit * * 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 @@ -50,6 +51,8 @@ #include <linux/io.h> #include <linux/bitrev.h> #include <linux/slab.h> +#include <linux/wait.h> +#include <linux/sched.h> #include <media/rc-core.h> #define DRVNAME "winbond-cir" @@ -118,14 +121,24 @@ #define WBCIR_IRQ_NONE 0x00 /* RX data bit for WBCIR_REG_SP3_IER and WBCIR_REG_SP3_EIR */ #define WBCIR_IRQ_RX 0x01 +/* TX data low bit for WBCIR_REG_SP3_IER and WBCIR_REG_SP3_EIR */ +#define WBCIR_IRQ_TX_LOW 0x02 /* Over/Under-flow bit for WBCIR_REG_SP3_IER and WBCIR_REG_SP3_EIR */ #define WBCIR_IRQ_ERR 0x04 +/* TX data empty bit for WBCEIR_REG_SP3_IER and WBCIR_REG_SP3_EIR */ +#define WBCIR_IRQ_TX_EMPTY 0x20 /* Led enable/disable bit for WBCIR_REG_ECEIR_CTS */ #define WBCIR_LED_ENABLE 0x80 /* RX data available bit for WBCIR_REG_SP3_LSR */ #define WBCIR_RX_AVAIL 0x01 +/* RX data overrun error bit for WBCIR_REG_SP3_LSR */ +#define WBCIR_RX_OVERRUN 0x02 +/* TX End-Of-Transmission bit for WBCIR_REG_SP3_ASCR */ +#define WBCIR_TX_EOT 0x04 /* RX disable bit for WBCIR_REG_SP3_ASCR */ #define WBCIR_RX_DISABLE 0x20 +/* TX data underrun error bit for WBCIR_REG_SP3_ASCR */ +#define WBCIR_TX_UNDERRUN 0x40 /* Extended mode enable bit for WBCIR_REG_SP3_EXCR1 */ #define WBCIR_EXT_ENABLE 0x01 /* Select compare register in WBCIR_REG_WCEIR_INDEX (bits 5 & 6) */ @@ -154,6 +167,21 @@ enum wbcir_protocol { IR_PROTOCOL_RC6 = 0x2, }; +/* Possible states for IR reception */ +enum wbcir_rxstate { + WBCIR_RXSTATE_INACTIVE = 0, + WBCIR_RXSTATE_ACTIVE, + WBCIR_RXSTATE_ERROR +}; + +/* Possible states for IR transmission */ +enum wbcir_txstate { + WBCIR_TXSTATE_INACTIVE = 0, + WBCIR_TXSTATE_ACTIVE, + WBCIR_TXSTATE_DONE, + WBCIR_TXSTATE_ERROR +}; + /* Misc */ #define WBCIR_NAME "Winbond CIR" #define WBCIR_ID_FAMILY 0xF1 /* Family ID for the WPCD376I */ @@ -166,22 +194,29 @@ enum wbcir_protocol { /* Per-device data */ struct wbcir_data { spinlock_t spinlock; + struct rc_dev *dev; + struct led_classdev led; unsigned long wbase; /* Wake-Up Baseaddr */ unsigned long ebase; /* Enhanced Func. Baseaddr */ unsigned long sbase; /* Serial Port Baseaddr */ unsigned int irq; /* Serial Port IRQ */ + u8 irqmask; - struct rc_dev *dev; - + /* RX state */ + enum wbcir_rxstate rxstate; struct led_trigger *rxtrigger; - struct led_trigger *txtrigger; - struct led_classdev led; + struct ir_raw_event rxev; - /* RX irdata state */ - bool irdata_active; - bool irdata_error; - struct ir_raw_event ev; + /* TX state */ + enum wbcir_txstate txstate; + struct led_trigger *txtrigger; + u32 txlen; + u32 txoff; + u32 *txbuf; + wait_queue_head_t txwaitq; + u8 txmask; + u32 txcarrier; }; static enum wbcir_protocol protocol = IR_PROTOCOL_RC6; @@ -193,6 +228,10 @@ static int invert; /* default = 0 */ module_param(invert, bool, 0444); MODULE_PARM_DESC(invert, "Invert the signal from the IR receiver"); +static int txandrx; /* default = 0 */ +module_param(txandrx, bool, 0444); +MODULE_PARM_DESC(invert, "Allow simultaneous TX and RX"); + static unsigned int wake_sc = 0x800F040C; module_param(wake_sc, uint, 0644); MODULE_PARM_DESC(wake_sc, "Scancode of the power-on IR command"); @@ -228,6 +267,17 @@ wbcir_select_bank(struct wbcir_data *data, enum wbcir_bank bank) outb(bank, data->sbase + WBCIR_REG_SP3_BSR); } +static inline void +wbcir_set_irqmask(struct wbcir_data *data, u8 irqmask) +{ + if (data->irqmask == irqmask) + return; + + wbcir_select_bank(data, WBCIR_BANK_0); + outb(irqmask, data->sbase + WBCIR_REG_SP3_IER); + data->irqmask = irqmask; +} + static enum led_brightness wbcir_led_brightness_get(struct led_classdev *led_cdev) { @@ -279,39 +329,15 @@ wbcir_to_rc6cells(u8 val) * *****************************************************************************/ -static irqreturn_t -wbcir_irq_handler(int irqno, void *cookie) +static void +wbcir_irq_rx(struct wbcir_data *data, struct pnp_dev *device) { - struct pnp_dev *device = cookie; - struct wbcir_data *data = pnp_get_drvdata(device); - unsigned long flags; u8 irdata[8]; - u8 disable = true; - u8 status; - int i; - - spin_lock_irqsave(&data->spinlock, flags); - - wbcir_select_bank(data, WBCIR_BANK_0); - - status = inb(data->sbase + WBCIR_REG_SP3_EIR); - - if (!(status & (WBCIR_IRQ_RX | WBCIR_IRQ_ERR))) { - spin_unlock_irqrestore(&data->spinlock, flags); - return IRQ_NONE; - } - - /* Check for e.g. buffer overflow */ - if (status & WBCIR_IRQ_ERR) { - data->irdata_error = true; - ir_raw_event_reset(data->dev); - } - - if (!(status & WBCIR_IRQ_RX)) - goto out; + bool disable = true; + unsigned int i; - if (!data->irdata_active) { - data->irdata_active = true; + if (data->rxstate == WBCIR_RXSTATE_INACTIVE) { + data->rxstate = WBCIR_RXSTATE_ACTIVE; led_trigger_event(data->rxtrigger, LED_FULL); } @@ -325,28 +351,29 @@ wbcir_irq_handler(int irqno, void *cookie) if (irdata[i] != 0xFF && irdata[i] != 0x00) disable = false; - if (data->irdata_error) + if (data->rxstate == WBCIR_RXSTATE_ERROR) continue; pulse = irdata[i] & 0x80 ? false : true; duration = (irdata[i] & 0x7F) * 10000; /* ns */ - if (data->ev.pulse != pulse) { - if (data->ev.duration != 0) { - ir_raw_event_store(data->dev, &data->ev); - data->ev.duration = 0; + if (data->rxev.pulse != pulse) { + if (data->rxev.duration != 0) { + ir_raw_event_store(data->dev, &data->rxev); + data->rxev.duration = 0; } - data->ev.pulse = pulse; + data->rxev.pulse = pulse; } - data->ev.duration += duration; + data->rxev.duration += duration; } if (disable) { - if (data->ev.duration != 0 && !data->irdata_error) { - ir_raw_event_store(data->dev, &data->ev); - data->ev.duration = 0; + if (data->rxev.duration != 0 && + data->rxstate != WBCIR_RXSTATE_ERROR) { + ir_raw_event_store(data->dev, &data->rxev); + data->rxev.duration = 0; } /* Set RXINACTIVE */ @@ -357,19 +384,264 @@ wbcir_irq_handler(int irqno, void *cookie) inb(data->sbase + WBCIR_REG_SP3_RXDATA); ir_raw_event_reset(data->dev); - data->irdata_error = false; - data->irdata_active = false; led_trigger_event(data->rxtrigger, LED_OFF); + data->rxstate = WBCIR_RXSTATE_INACTIVE; } ir_raw_event_handle(data->dev); +} + +static void +wbcir_irq_tx(struct wbcir_data *data) +{ + unsigned int space; + unsigned int used; + u8 bytes[16]; + u8 byte; + + if (!data->txbuf) + return; + + switch (data->txstate) { + case WBCIR_TXSTATE_INACTIVE: + /* TX FIFO empty */ + space = 16; + led_trigger_event(data->txtrigger, LED_FULL); + break; + case WBCIR_TXSTATE_ACTIVE: + /* TX FIFO low (3 bytes or less) */ + space = 13; + break; + case WBCIR_TXSTATE_ERROR: + space = 0; + break; + default: + return; + } + + /* + * TX data is run-length coded in bytes: YXXXXXXX + * Y = space (1) or pulse (0) + * X = duration, encoded as (X + 1) * 10us (i.e 10 to 1280 us) + */ + for (used = 0; used < space && data->txoff != data->txlen; used++) { + if (data->txbuf[data->txoff] == 0) { + data->txoff++; + continue; + } + byte = min((u32)0x80, data->txbuf[data->txoff]); + data->txbuf[data->txoff] -= byte; + byte--; + byte |= (data->txoff % 2 ? 0x80 : 0x00); /* pulse/space */ + bytes[used] = byte; + } + + while (data->txbuf[data->txoff] == 0 && data->txoff != data->txlen) + data->txoff++; + + if (used == 0) { + /* Finished */ + if (data->txstate == WBCIR_TXSTATE_ERROR) + /* Clear TX underrun bit */ + outb(WBCIR_TX_UNDERRUN, data->sbase + WBCIR_REG_SP3_ASCR); + else + data->txstate = WBCIR_TXSTATE_DONE; + wbcir_set_irqmask(data, WBCIR_IRQ_RX | WBCIR_IRQ_ERR); + led_trigger_event(data->txtrigger, LED_OFF); + wake_up(&data->txwaitq); + } else if (data->txoff == data->txlen) { + /* At the end of transmission, tell the hw before last byte */ + outsb(data->sbase + WBCIR_REG_SP3_TXDATA, bytes, used - 1); + outb(WBCIR_TX_EOT, data->sbase + WBCIR_REG_SP3_ASCR); + outb(bytes[used - 1], data->sbase + WBCIR_REG_SP3_TXDATA); + wbcir_set_irqmask(data, WBCIR_IRQ_RX | WBCIR_IRQ_ERR | + WBCIR_IRQ_TX_EMPTY); + } else { + /* More data to follow... */ + outsb(data->sbase + WBCIR_REG_SP3_RXDATA, bytes, used); + if (data->txstate == WBCIR_TXSTATE_INACTIVE) { + wbcir_set_irqmask(data, WBCIR_IRQ_RX | WBCIR_IRQ_ERR | + WBCIR_IRQ_TX_LOW); + data->txstate = WBCIR_TXSTATE_ACTIVE; + } + } +} + +static irqreturn_t +wbcir_irq_handler(int irqno, void *cookie) +{ + struct pnp_dev *device = cookie; + struct wbcir_data *data = pnp_get_drvdata(device); + unsigned long flags; + u8 status; + + spin_lock_irqsave(&data->spinlock, flags); + wbcir_select_bank(data, WBCIR_BANK_0); + status = inb(data->sbase + WBCIR_REG_SP3_EIR); + status &= data->irqmask; + + if (!status) { + spin_unlock_irqrestore(&data->spinlock, flags); + return IRQ_NONE; + } + + if (status & WBCIR_IRQ_ERR) { + /* RX overflow? (read clears bit) */ + if (inb(data->sbase + WBCIR_REG_SP3_LSR) & WBCIR_RX_OVERRUN) { + data->rxstate = WBCIR_RXSTATE_ERROR; + ir_raw_event_reset(data->dev); + } + + /* TX underflow? */ + if (inb(data->sbase + WBCIR_REG_SP3_ASCR) & WBCIR_TX_UNDERRUN) + data->txstate = WBCIR_TXSTATE_ERROR; + } + + if (status & WBCIR_IRQ_RX) + wbcir_irq_rx(data, device); + + if (status & (WBCIR_IRQ_TX_LOW | WBCIR_IRQ_TX_EMPTY)) + wbcir_irq_tx(data); -out: spin_unlock_irqrestore(&data->spinlock, flags); return IRQ_HANDLED; } +/***************************************************************************** + * + * RC-CORE INTERFACE FUNCTIONS + * + *****************************************************************************/ + +static int +wbcir_txcarrier(struct rc_dev *dev, u32 carrier) +{ + struct wbcir_data *data = dev->priv; + unsigned long flags; + u8 val; + u32 freq; + + freq = DIV_ROUND_CLOSEST(carrier, 1000); + if (freq < 30 || freq > 60) + return -EINVAL; + + switch (freq) { + case 58: + case 59: + case 60: + val = freq - 58; + freq *= 1000; + break; + case 57: + val = freq - 27; + freq = 56900; + break; + default: + val = freq - 27; + freq *= 1000; + break; + } + + spin_lock_irqsave(&data->spinlock, flags); + if (data->txstate != WBCIR_TXSTATE_INACTIVE) { + spin_unlock_irqrestore(&data->spinlock, flags); + return -EBUSY; + } + + if (data->txcarrier != freq) { + wbcir_select_bank(data, WBCIR_BANK_7); + wbcir_set_bits(data->sbase + WBCIR_REG_SP3_IRTXMC, val, 0x1F); + data->txcarrier = freq; + } + + spin_unlock_irqrestore(&data->spinlock, flags); + return 0; +} + +static int +wbcir_txmask(struct rc_dev *dev, u32 mask) +{ + struct wbcir_data *data = dev->priv; + unsigned long flags; + u8 val; + + /* Four outputs, only one output can be enabled at a time */ + switch (mask) { + case 0x1: + val = 0x0; + break; + case 0x2: + val = 0x1; + break; + case 0x4: + val = 0x2; + break; + case 0x8: + val = 0x3; + break; + default: + return -EINVAL; + } + + spin_lock_irqsave(&data->spinlock, flags); + if (data->txstate != WBCIR_TXSTATE_INACTIVE) { + spin_unlock_irqrestore(&data->spinlock, flags); + return -EBUSY; + } + + if (data->txmask != mask) { + wbcir_set_bits(data->ebase + WBCIR_REG_ECEIR_CTS, val, 0x0c); + data->txmask = mask; + } + + spin_unlock_irqrestore(&data->spinlock, flags); + return 0; +} + +static int +wbcir_tx(struct rc_dev *dev, int *buf, u32 bufsize) +{ + struct wbcir_data *data = dev->priv; + u32 count; + unsigned i; + unsigned long flags; + + /* bufsize has been sanity checked by the caller */ + count = bufsize / sizeof(int); + + /* Not sure if this is possible, but better safe than sorry */ + spin_lock_irqsave(&data->spinlock, flags); + if (data->txstate != WBCIR_TXSTATE_INACTIVE) { + spin_unlock_irqrestore(&data->spinlock, flags); + return -EBUSY; + } + + /* Convert values to multiples of 10us */ + for (i = 0; i < count; i++) + buf[i] = DIV_ROUND_CLOSEST(buf[i], 10); + + /* Fill the TX fifo once, the irq handler will do the rest */ + data->txbuf = buf; + data->txlen = count; + data->txoff = 0; + wbcir_irq_tx(data); + + /* Wait for the TX to complete */ + while (data->txstate == WBCIR_TXSTATE_ACTIVE) { + spin_unlock_irqrestore(&data->spinlock, flags); + wait_event(data->txwaitq, data->txstate != WBCIR_TXSTATE_ACTIVE); + spin_lock_irqsave(&data->spinlock, flags); + } + + /* We're done */ + if (data->txstate == WBCIR_TXSTATE_ERROR) + count = -EAGAIN; + data->txstate = WBCIR_TXSTATE_INACTIVE; + data->txbuf = NULL; + spin_unlock_irqrestore(&data->spinlock, flags); + return count; +} /***************************************************************************** * @@ -551,21 +823,18 @@ finish: wbcir_set_bits(data->wbase + WBCIR_REG_WCEIR_CTL, 0x00, 0x01); } - /* Disable interrupts */ - wbcir_select_bank(data, WBCIR_BANK_0); - outb(WBCIR_IRQ_NONE, data->sbase + WBCIR_REG_SP3_IER); - - /* Disable LED */ - data->irdata_active = false; - led_trigger_event(data->rxtrigger, LED_OFF); - /* * ACPI will set the HW disable bit for SP3 which means that the * output signals are left in an undefined state which may cause * spurious interrupts which we need to ignore until the hardware * is reinitialized. */ + wbcir_set_irqmask(data, WBCIR_IRQ_NONE); disable_irq(data->irq); + + /* Disable LED */ + led_trigger_event(data->rxtrigger, LED_OFF); + led_trigger_event(data->txtrigger, LED_OFF); } static int @@ -581,8 +850,7 @@ wbcir_init_hw(struct wbcir_data *data) u8 tmp; /* Disable interrupts */ - wbcir_select_bank(data, WBCIR_BANK_0); - outb(WBCIR_IRQ_NONE, data->sbase + WBCIR_REG_SP3_IER); + wbcir_set_irqmask(data, WBCIR_IRQ_NONE); /* Set PROT_SEL, RX_INV, Clear CEIR_EN (needed for the led) */ tmp = protocol << 4; @@ -606,10 +874,11 @@ wbcir_init_hw(struct wbcir_data *data) outb(0x00, data->ebase + WBCIR_REG_ECEIR_CCTL); /* - * Clear IR LED, set SP3 clock to 24Mhz + * Clear IR LED, set SP3 clock to 24Mhz, set TX mask to IRTX1, * set SP3_IRRX_SW to binary 01, helpfully not documented */ outb(0x10, data->ebase + WBCIR_REG_ECEIR_CTS); + data->txmask = 0x1; /* Enable extended mode */ wbcir_select_bank(data, WBCIR_BANK_2); @@ -657,18 +926,21 @@ wbcir_init_hw(struct wbcir_data *data) wbcir_select_bank(data, WBCIR_BANK_4); outb(0x00, data->sbase + WBCIR_REG_SP3_IRCR1); - /* Enable MSR interrupt, Clear AUX_IRX */ + /* Disable MSR interrupt, clear AUX_IRX, mask RX during TX? */ wbcir_select_bank(data, WBCIR_BANK_5); - outb(0x00, data->sbase + WBCIR_REG_SP3_IRCR2); + outb(txandrx ? 0x03 : 0x02, data->sbase + WBCIR_REG_SP3_IRCR2); /* Disable CRC */ wbcir_select_bank(data, WBCIR_BANK_6); outb(0x20, data->sbase + WBCIR_REG_SP3_IRCR3); - /* Set RX/TX (de)modulation freq, not really used */ + /* Set RX demodulation freq, not really used */ wbcir_select_bank(data, WBCIR_BANK_7); outb(0xF2, data->sbase + WBCIR_REG_SP3_IRRXDC); + + /* Set TX modulation, 36kHz, 7us pulse width */ outb(0x69, data->sbase + WBCIR_REG_SP3_IRTXMC); + data->txcarrier = 36000; /* Set invert and pin direction */ if (invert) @@ -683,16 +955,23 @@ wbcir_init_hw(struct wbcir_data *data) /* Clear AUX status bits */ outb(0xE0, data->sbase + WBCIR_REG_SP3_ASCR); - /* Clear IR decoding state */ - data->irdata_active = false; - led_trigger_event(data->rxtrigger, LED_OFF); - data->irdata_error = false; - data->ev.duration = 0; + /* Clear RX state */ + data->rxstate = WBCIR_RXSTATE_INACTIVE; + data->rxev.duration = 0; ir_raw_event_reset(data->dev); ir_raw_event_handle(data->dev); + /* + * Check TX state, if we did a suspend/resume cycle while TX was + * active, we will have a process waiting in txwaitq. + */ + if (data->txstate == WBCIR_TXSTATE_ACTIVE) { + data->txstate = WBCIR_TXSTATE_ERROR; + wake_up(&data->txwaitq); + } + /* Enable interrupts */ - outb(WBCIR_IRQ_RX | WBCIR_IRQ_ERR, data->sbase + WBCIR_REG_SP3_IER); + wbcir_set_irqmask(data, WBCIR_IRQ_RX | WBCIR_IRQ_ERR); } static int @@ -729,6 +1008,7 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id) pnp_set_drvdata(device, data); spin_lock_init(&data->spinlock); + init_waitqueue_head(&data->txwaitq); data->ebase = pnp_port_start(device, 0); data->wbase = pnp_port_start(device, 1); data->sbase = pnp_port_start(device, 2); @@ -807,6 +1087,10 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id) data->dev->input_id.vendor = PCI_VENDOR_ID_WINBOND; data->dev->input_id.product = WBCIR_ID_FAMILY; data->dev->input_id.version = WBCIR_ID_CHIP; + data->dev->map_name = RC_MAP_RC6_MCE; + data->dev->s_tx_mask = wbcir_txmask; + data->dev->s_tx_carrier = wbcir_txcarrier; + data->dev->tx_ir = wbcir_tx; data->dev->priv = data; data->dev->dev.parent = &device->dev; @@ -849,9 +1133,7 @@ wbcir_remove(struct pnp_dev *device) struct wbcir_data *data = pnp_get_drvdata(device); /* Disable interrupts */ - wbcir_select_bank(data, WBCIR_BANK_0); - outb(WBCIR_IRQ_NONE, data->sbase + WBCIR_REG_SP3_IER); - + wbcir_set_irqmask(data, WBCIR_IRQ_NONE); free_irq(data->irq, device); /* Clear status bits NEC_REP, BUFF, MSG_END, MATCH */ |