diff options
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r-- | drivers/spi/spi.c | 219 |
1 files changed, 204 insertions, 15 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 27e4f1f..3abb390 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -67,11 +67,141 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf) } static DEVICE_ATTR_RO(modalias); +#define SPI_STATISTICS_ATTRS(field, file) \ +static ssize_t spi_master_##field##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct spi_master *master = container_of(dev, \ + struct spi_master, dev); \ + return spi_statistics_##field##_show(&master->statistics, buf); \ +} \ +static struct device_attribute dev_attr_spi_master_##field = { \ + .attr = { .name = file, .mode = S_IRUGO }, \ + .show = spi_master_##field##_show, \ +}; \ +static ssize_t spi_device_##field##_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct spi_device *spi = container_of(dev, \ + struct spi_device, dev); \ + return spi_statistics_##field##_show(&spi->statistics, buf); \ +} \ +static struct device_attribute dev_attr_spi_device_##field = { \ + .attr = { .name = file, .mode = S_IRUGO }, \ + .show = spi_device_##field##_show, \ +} + +#define SPI_STATISTICS_SHOW_NAME(name, file, field, format_string) \ +static ssize_t spi_statistics_##name##_show(struct spi_statistics *stat, \ + char *buf) \ +{ \ + unsigned long flags; \ + ssize_t len; \ + spin_lock_irqsave(&stat->lock, flags); \ + len = sprintf(buf, format_string, stat->field); \ + spin_unlock_irqrestore(&stat->lock, flags); \ + return len; \ +} \ +SPI_STATISTICS_ATTRS(name, file) + +#define SPI_STATISTICS_SHOW(field, format_string) \ + SPI_STATISTICS_SHOW_NAME(field, __stringify(field), \ + field, format_string) + +SPI_STATISTICS_SHOW(messages, "%lu"); +SPI_STATISTICS_SHOW(transfers, "%lu"); +SPI_STATISTICS_SHOW(errors, "%lu"); +SPI_STATISTICS_SHOW(timedout, "%lu"); + +SPI_STATISTICS_SHOW(spi_sync, "%lu"); +SPI_STATISTICS_SHOW(spi_sync_immediate, "%lu"); +SPI_STATISTICS_SHOW(spi_async, "%lu"); + +SPI_STATISTICS_SHOW(bytes, "%llu"); +SPI_STATISTICS_SHOW(bytes_rx, "%llu"); +SPI_STATISTICS_SHOW(bytes_tx, "%llu"); + static struct attribute *spi_dev_attrs[] = { &dev_attr_modalias.attr, NULL, }; -ATTRIBUTE_GROUPS(spi_dev); + +static const struct attribute_group spi_dev_group = { + .attrs = spi_dev_attrs, +}; + +static struct attribute *spi_device_statistics_attrs[] = { + &dev_attr_spi_device_messages.attr, + &dev_attr_spi_device_transfers.attr, + &dev_attr_spi_device_errors.attr, + &dev_attr_spi_device_timedout.attr, + &dev_attr_spi_device_spi_sync.attr, + &dev_attr_spi_device_spi_sync_immediate.attr, + &dev_attr_spi_device_spi_async.attr, + &dev_attr_spi_device_bytes.attr, + &dev_attr_spi_device_bytes_rx.attr, + &dev_attr_spi_device_bytes_tx.attr, + NULL, +}; + +static const struct attribute_group spi_device_statistics_group = { + .name = "statistics", + .attrs = spi_device_statistics_attrs, +}; + +static const struct attribute_group *spi_dev_groups[] = { + &spi_dev_group, + &spi_device_statistics_group, + NULL, +}; + +static struct attribute *spi_master_statistics_attrs[] = { + &dev_attr_spi_master_messages.attr, + &dev_attr_spi_master_transfers.attr, + &dev_attr_spi_master_errors.attr, + &dev_attr_spi_master_timedout.attr, + &dev_attr_spi_master_spi_sync.attr, + &dev_attr_spi_master_spi_sync_immediate.attr, + &dev_attr_spi_master_spi_async.attr, + &dev_attr_spi_master_bytes.attr, + &dev_attr_spi_master_bytes_rx.attr, + &dev_attr_spi_master_bytes_tx.attr, + NULL, +}; + +static const struct attribute_group spi_master_statistics_group = { + .name = "statistics", + .attrs = spi_master_statistics_attrs, +}; + +static const struct attribute_group *spi_master_groups[] = { + &spi_master_statistics_group, + NULL, +}; + +void spi_statistics_add_transfer_stats(struct spi_statistics *stats, + struct spi_transfer *xfer, + struct spi_master *master) +{ + unsigned long flags; + + spin_lock_irqsave(&stats->lock, flags); + + stats->transfers++; + + stats->bytes += xfer->len; + if ((xfer->tx_buf) && + (xfer->tx_buf != master->dummy_tx)) + stats->bytes_tx += xfer->len; + if ((xfer->rx_buf) && + (xfer->rx_buf != master->dummy_rx)) + stats->bytes_rx += xfer->len; + + spin_unlock_irqrestore(&stats->lock, flags); +} +EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats); /* modalias support makes "modprobe $MODALIAS" new-style hotplug work, * and the sysfs version makes coldplug work too. @@ -249,6 +379,9 @@ struct spi_device *spi_alloc_device(struct spi_master *master) spi->dev.bus = &spi_bus_type; spi->dev.release = spidev_release; spi->cs_gpio = -ENOENT; + + spin_lock_init(&spi->statistics.lock); + device_initialize(&spi->dev); return spi; } @@ -549,8 +682,15 @@ static int __spi_map_msg(struct spi_master *master, struct spi_message *msg) if (!master->can_dma) return 0; - tx_dev = master->dma_tx->device->dev; - rx_dev = master->dma_rx->device->dev; + if (master->dma_tx) + tx_dev = master->dma_tx->device->dev; + else + tx_dev = &master->dev; + + if (master->dma_rx) + rx_dev = master->dma_rx->device->dev; + else + rx_dev = &master->dev; list_for_each_entry(xfer, &msg->transfers, transfer_list) { if (!master->can_dma(master, msg->spi, xfer)) @@ -589,8 +729,15 @@ static int __spi_unmap_msg(struct spi_master *master, struct spi_message *msg) if (!master->cur_msg_mapped || !master->can_dma) return 0; - tx_dev = master->dma_tx->device->dev; - rx_dev = master->dma_rx->device->dev; + if (master->dma_tx) + tx_dev = master->dma_tx->device->dev; + else + tx_dev = &master->dev; + + if (master->dma_rx) + rx_dev = master->dma_rx->device->dev; + else + rx_dev = &master->dev; list_for_each_entry(xfer, &msg->transfers, transfer_list) { if (!master->can_dma(master, msg->spi, xfer)) @@ -699,17 +846,29 @@ static int spi_transfer_one_message(struct spi_master *master, bool keep_cs = false; int ret = 0; unsigned long ms = 1; + struct spi_statistics *statm = &master->statistics; + struct spi_statistics *stats = &msg->spi->statistics; spi_set_cs(msg->spi, true); + SPI_STATISTICS_INCREMENT_FIELD(statm, messages); + SPI_STATISTICS_INCREMENT_FIELD(stats, messages); + list_for_each_entry(xfer, &msg->transfers, transfer_list) { trace_spi_transfer_start(msg, xfer); + spi_statistics_add_transfer_stats(statm, xfer, master); + spi_statistics_add_transfer_stats(stats, xfer, master); + if (xfer->tx_buf || xfer->rx_buf) { reinit_completion(&master->xfer_completion); ret = master->transfer_one(master, msg->spi, xfer); if (ret < 0) { + SPI_STATISTICS_INCREMENT_FIELD(statm, + errors); + SPI_STATISTICS_INCREMENT_FIELD(stats, + errors); dev_err(&msg->spi->dev, "SPI transfer failed: %d\n", ret); goto out; @@ -725,6 +884,10 @@ static int spi_transfer_one_message(struct spi_master *master, } if (ms == 0) { + SPI_STATISTICS_INCREMENT_FIELD(statm, + timedout); + SPI_STATISTICS_INCREMENT_FIELD(stats, + timedout); dev_err(&msg->spi->dev, "SPI transfer timed out\n"); msg->status = -ETIMEDOUT; @@ -1426,10 +1589,10 @@ static struct class spi_master_class = { .name = "spi_master", .owner = THIS_MODULE, .dev_release = spi_master_release, + .dev_groups = spi_master_groups, }; - /** * spi_alloc_master - allocate SPI master controller * @dev: the controller, possibly using the platform_bus @@ -1595,6 +1758,8 @@ int spi_register_master(struct spi_master *master) goto done; } } + /* add statistics */ + spin_lock_init(&master->statistics.lock); mutex_lock(&board_lock); list_add_tail(&master->list, &spi_master_list); @@ -1750,6 +1915,20 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master); * other core methods are currently defined as inline functions. */ +static int __spi_validate_bits_per_word(struct spi_master *master, u8 bits_per_word) +{ + if (master->bits_per_word_mask) { + /* Only 32 bits fit in the mask */ + if (bits_per_word > 32) + return -EINVAL; + if (!(master->bits_per_word_mask & + SPI_BPW_MASK(bits_per_word))) + return -EINVAL; + } + + return 0; +} + /** * spi_setup - setup SPI mode and clock rate * @spi: the device whose settings are being modified @@ -1808,6 +1987,9 @@ int spi_setup(struct spi_device *spi) if (!spi->bits_per_word) spi->bits_per_word = 8; + if (__spi_validate_bits_per_word(spi->master, spi->bits_per_word)) + return -EINVAL; + if (!spi->max_speed_hz) spi->max_speed_hz = spi->master->max_speed_hz; @@ -1870,19 +2052,15 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) if (!xfer->speed_hz) xfer->speed_hz = spi->max_speed_hz; + if (!xfer->speed_hz) + xfer->speed_hz = master->max_speed_hz; if (master->max_speed_hz && xfer->speed_hz > master->max_speed_hz) xfer->speed_hz = master->max_speed_hz; - if (master->bits_per_word_mask) { - /* Only 32 bits fit in the mask */ - if (xfer->bits_per_word > 32) - return -EINVAL; - if (!(master->bits_per_word_mask & - BIT(xfer->bits_per_word - 1))) - return -EINVAL; - } + if (__spi_validate_bits_per_word(master, xfer->bits_per_word)) + return -EINVAL; /* * SPI transfer length should be multiple of SPI word size @@ -1949,6 +2127,9 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) message->spi = spi; + SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_async); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_async); + trace_spi_message_submit(message); return master->transfer(spi, message); @@ -2085,6 +2266,9 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message, message->context = &done; message->spi = spi; + SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_sync); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync); + if (!bus_locked) mutex_lock(&master->bus_lock_mutex); @@ -2112,8 +2296,13 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message, /* Push out the messages in the calling context if we * can. */ - if (master->transfer == spi_queued_transfer) + if (master->transfer == spi_queued_transfer) { + SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, + spi_sync_immediate); + SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, + spi_sync_immediate); __spi_pump_messages(master, false); + } wait_for_completion(&done); status = message->status; |