[PATCH v2] Staging: pi433: fix brace coding style issues in pi433_if.c

From: Tomas Marek
Date: Mon Dec 04 2017 - 15:40:55 EST

This patch fix several brace on next line, braces not necessary, space
around =/<, and space before/after open/close parenthesis coding style
errors find by checkpatch in pi433_if.c.

In addition, the interrupt routine DIO0_irq_handler logic is updated:
- use 'switch' statement instead of 'if/else if' combination for the
sake of readability, and
- use dev_dbg_ratelimited instead of dev_dbg to avoid message flooding.

Signed-off-by: Tomas Marek <marek_tomas@xxxxxxxxxx>
---
Changes in v2:
- DIO0_irq_handler updated - 'if/else if' replaced by 'switch' and
'dev_dbg_ratelimited' used instead of 'dev_dbg' according to Joe
Perches suggestion.
- The removal of braces around SET_CHECKED() reverted - caused syntax
error and is addressed by another patch
"[PATCHv2] staging: pi433: pi433_if.c remove SET_CHECKED macro".
---
drivers/staging/pi433/pi433_if.c | 135 ++++++++++++++++-----------------------
1 file changed, 54 insertions(+), 81 deletions(-)

diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index 2a205c6..3a333b8 100644
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -132,23 +132,29 @@ struct pi433_instance {
static irqreturn_t DIO0_irq_handler(int irq, void *dev_id)
{
struct pi433_device *device = dev_id;
+ wait_queue_head_t *wq;
+ const char *msg = NULL;

- if (device->irq_state[DIO0] == DIO_PacketSent)
- {
+ switch (device->irq_state[DIO0]) {
+ case DIO_PacketSent:
device->free_in_fifo = FIFO_SIZE;
- dev_dbg(device->dev, "DIO0 irq: Packet sent\n");
- wake_up_interruptible(&device->fifo_wait_queue);
- }
- else if (device->irq_state[DIO0] == DIO_Rssi_DIO0)
- {
- dev_dbg(device->dev, "DIO0 irq: RSSI level over threshold\n");
- wake_up_interruptible(&device->rx_wait_queue);
- }
- else if (device->irq_state[DIO0] == DIO_PayloadReady)
- {
- dev_dbg(device->dev, "DIO0 irq: PayloadReady\n");
+ msg = "Packet sent";
+ wq = &device->fifo_wait_queue;
+ break;
+ case DIO_Rssi_DIO0:
+ msg = "RSSI level over threshold";
+ wq = &device->rx_wait_queue;
+ break;
+ case DIO_PayloadReady:
device->free_in_fifo = 0;
- wake_up_interruptible(&device->fifo_wait_queue);
+ msg = "PayloadReady";
+ wq = &device->fifo_wait_queue;
+ break;
+ }
+
+ if (msg) {
+ dev_dbg_ratelimited(device->dev, "DIO0 irq: %s\n", msg);
+ wake_up_interruptible(wq);
}

return IRQ_HANDLED;
@@ -158,12 +164,9 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
{
struct pi433_device *device = dev_id;

- if (device->irq_state[DIO1] == DIO_FifoNotEmpty_DIO1)
- {
+ if (device->irq_state[DIO1] == DIO_FifoNotEmpty_DIO1) {
device->free_in_fifo = FIFO_SIZE;
- }
- else if (device->irq_state[DIO1] == DIO_FifoLevel)
- {
+ } else if (device->irq_state[DIO1] == DIO_FifoLevel) {
if (device->rx_active) device->free_in_fifo = FIFO_THRESHOLD - 1;
else device->free_in_fifo = FIFO_SIZE - FIFO_THRESHOLD - 1;
}
@@ -220,19 +223,14 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)

/* lengths */
SET_CHECKED(rf69_set_sync_size(dev->spi, rx_cfg->sync_length));
- if (rx_cfg->enable_length_byte == optionOn)
- {
+ if (rx_cfg->enable_length_byte == optionOn) {
SET_CHECKED(rf69_set_payload_length(dev->spi, 0xff));
- }
- else if (rx_cfg->fixed_message_length != 0)
- {
+ } else if (rx_cfg->fixed_message_length != 0) {
payload_length = rx_cfg->fixed_message_length;
if (rx_cfg->enable_length_byte == optionOn) payload_length++;
if (rx_cfg->enable_address_filtering != filteringOff) payload_length++;
SET_CHECKED(rf69_set_payload_length(dev->spi, payload_length));
- }
- else
- {
+ } else {
SET_CHECKED(rf69_set_payload_length(dev->spi, 0));
}

@@ -241,8 +239,8 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
{
SET_CHECKED(rf69_set_sync_values(dev->spi, rx_cfg->sync_pattern));
}
- if (rx_cfg->enable_address_filtering != filteringOff)
- {
+
+ if (rx_cfg->enable_address_filtering != filteringOff) {
SET_CHECKED(rf69_set_node_address (dev->spi, rx_cfg->node_address));
SET_CHECKED(rf69_set_broadcast_address(dev->spi, rx_cfg->broadcast_address));
}
@@ -341,8 +339,8 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
/* wait for any tx to finish */
dev_dbg(dev->dev,"rx: going to wait for any tx to finish");
retval = wait_event_interruptible(dev->rx_wait_queue, !dev->tx_active);
- if(retval) /* wait was interrupted */
- {
+ if (retval) {
+ /* wait was interrupted */
dev->interrupt_rx_allowed = true;
wake_up_interruptible(&dev->tx_wait_queue);
return retval;
@@ -359,8 +357,7 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
return retval;

/* now check RSSI, if low wait for getting high (RSSI interrupt) */
- while ( !rf69_get_flag(dev->spi, rssiExceededThreshold) )
- {
+ while (!rf69_get_flag(dev->spi, rssiExceededThreshold)) {
/* allow tx to interrupt us while waiting for high RSSI */
dev->interrupt_rx_allowed = true;
wake_up_interruptible(&dev->tx_wait_queue);
@@ -383,25 +380,20 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
irq_set_irq_type(dev->irq_num[DIO0], IRQ_TYPE_EDGE_RISING);

/* fixed or unlimited length? */
- if (dev->rx_cfg.fixed_message_length != 0)
- {
- if (dev->rx_cfg.fixed_message_length > dev->rx_buffer_size)
- {
+ if (dev->rx_cfg.fixed_message_length != 0) {
+ if (dev->rx_cfg.fixed_message_length > dev->rx_buffer_size) {
retval = -1;
goto abort;
}
bytes_total = dev->rx_cfg.fixed_message_length;
dev_dbg(dev->dev,"rx: msg len set to %d by fixed length", bytes_total);
- }
- else
- {
+ } else {
bytes_total = dev->rx_buffer_size;
dev_dbg(dev->dev, "rx: msg len set to %d as requested by read", bytes_total);
}

/* length byte enabled? */
- if (dev->rx_cfg.enable_length_byte == optionOn)
- {
+ if (dev->rx_cfg.enable_length_byte == optionOn) {
retval = wait_event_interruptible(dev->fifo_wait_queue,
dev->free_in_fifo < FIFO_SIZE);
if (retval) goto abort; /* wait was interrupted */
@@ -416,8 +408,7 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
}

/* address byte enabled? */
- if (dev->rx_cfg.enable_address_filtering != filteringOff)
- {
+ if (dev->rx_cfg.enable_address_filtering != filteringOff) {
u8 dummy;

bytes_total--;
@@ -432,10 +423,8 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
}

/* get payload */
- while (dev->rx_position < bytes_total)
- {
- if ( !rf69_get_flag(dev->spi, payloadReady) )
- {
+ while (dev->rx_position < bytes_total) {
+ if (!rf69_get_flag(dev->spi, payloadReady)) {
retval = wait_event_interruptible(dev->fifo_wait_queue,
dev->free_in_fifo < FIFO_SIZE);
if (retval) goto abort; /* wait was interrupted */
@@ -489,8 +478,7 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
int position, repetitions;
int retval;

- while (1)
- {
+ while (1) {
/* wait for fifo to be populated or for request to terminate*/
dev_dbg(device->dev, "thread: going to wait for new messages");
wait_event_interruptible(device->tx_wait_queue,
@@ -565,8 +553,7 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
disable_irq(device->irq_num[DIO0]);
device->tx_active = true;

- if (device->rx_active && rx_interrupted == false)
- {
+ if (device->rx_active && rx_interrupted == false) {
/* rx is currently waiting for a telegram;
* we need to set the radio module to standby
*/
@@ -607,19 +594,17 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
device->free_in_fifo = FIFO_SIZE;
position = 0;
repetitions = tx_cfg.repetitions;
- while( (repetitions > 0) && (size > position) )
- {
- if ( (size - position) > device->free_in_fifo)
- { /* msg to big for fifo - take a part */
+ while ((repetitions > 0) && (size > position)) {
+ if ((size - position) > device->free_in_fifo) {
+ /* msg to big for fifo - take a part */
int temp = device->free_in_fifo;
device->free_in_fifo = 0;
rf69_write_fifo(spi,
&buffer[position],
temp);
position +=temp;
- }
- else
- { /* msg fits into fifo - take all */
+ } else {
+ /* msg fits into fifo - take all */
device->free_in_fifo -= size;
repetitions--;
rf69_write_fifo(spi,
@@ -648,8 +633,7 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)
/* everything sent? */
if (kfifo_is_empty(&device->tx_fifo)) {
abort:
- if (rx_interrupted)
- {
+ if (rx_interrupted) {
rx_interrupted = false;
pi433_start_rx(device);
}
@@ -678,13 +662,10 @@ static irqreturn_t DIO1_irq_handler(int irq, void *dev_id)

/* just one read request at a time */
mutex_lock(&device->rx_lock);
- if (device->rx_active)
- {
+ if (device->rx_active) {
mutex_unlock(&device->rx_lock);
return -EAGAIN;
- }
- else
- {
+ } else {
device->rx_active = true;
mutex_unlock(&device->rx_lock);
}
@@ -909,8 +890,7 @@ static int setup_GPIOs(struct pi433_device *device)
DIO1_irq_handler
};

- for (i=0; i<NUM_DIO; i++)
- {
+ for (i = 0; i < NUM_DIO; i++) {
/* "construct" name and get the gpio descriptor */
snprintf(name, sizeof(name), "DIO%d", i);
device->gpiod[i] = gpiod_get(&device->spi->dev, name, 0 /*GPIOD_IN*/);
@@ -923,12 +903,10 @@ static int setup_GPIOs(struct pi433_device *device)
if (device->gpiod[i] == ERR_PTR(-EBUSY))
dev_dbg(&device->spi->dev, "%s is busy.", name);

- if ( IS_ERR(device->gpiod[i]) )
- {
+ if (IS_ERR(device->gpiod[i])) {
retval = PTR_ERR(device->gpiod[i]);
/* release already allocated gpios */
- for (i--; i>=0; i--)
- {
+ for (i--; i >= 0; i--) {
free_irq(device->irq_num[i], device);
gpiod_put(device->gpiod[i]);
}
@@ -967,8 +945,7 @@ static void free_GPIOs(struct pi433_device *device)
{
int i;

- for (i=0; i<NUM_DIO; i++)
- {
+ for (i = 0; i < NUM_DIO; i++) {
/* check if gpiod is valid */
if ( IS_ERR(device->gpiod[i]) )
continue;
@@ -1032,13 +1009,10 @@ static int pi433_probe(struct spi_device *spi)
/* spi->max_speed_hz = 10000000; 1MHz already set by device tree overlay */

retval = spi_setup(spi);
- if (retval)
- {
+ if (retval) {
dev_dbg(&spi->dev, "configuration of SPI interface failed!\n");
return retval;
- }
- else
- {
+ } else {
dev_dbg(&spi->dev,
"spi interface setup: mode 0x%2x, %d bits per word, %dhz max speed",
spi->mode, spi->bits_per_word, spi->max_speed_hz);
@@ -1124,8 +1098,7 @@ static int pi433_probe(struct spi_device *spi)
pr_err("pi433: device register failed\n");
retval = PTR_ERR(device->dev);
goto device_create_failed;
- }
- else {
+ } else {
dev_dbg(device->dev,
"created device for major %d, minor %d\n",
MAJOR(pi433_dev),
--
1.9.1