This patch adds preliminary IR TX capabilities to the
winbond-cir driver.
Signed-off-by: David HÃrdeman <david@xxxxxxxxxxx>
---
drivers/media/rc/winbond-cir.c | 431 +++++++++++++++++++++++++++++++++-------
1 files changed, 356 insertions(+), 75 deletions(-)
diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
index cdb5ef4..6ba4438 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);
@@ -647,18 +916,21 @@ 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)
@@ -673,16 +945,23 @@ 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
@@ -719,6 +998,7 @@ 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);
@@ -799,6 +1079,9 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
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;
@@ -841,9 +1124,7 @@ 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 */
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
