diff options
Diffstat (limited to 'drivers/spi/spidev.c')
| -rw-r--r-- | drivers/spi/spidev.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index e50039fb1474..6941e04afb8c 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -87,6 +87,7 @@ struct spidev_data { unsigned users; u8 *tx_buffer; u8 *rx_buffer; + u32 speed_hz; }; static LIST_HEAD(device_list); @@ -138,6 +139,7 @@ spidev_sync_write(struct spidev_data *spidev, size_t len) struct spi_transfer t = { .tx_buf = spidev->tx_buffer, .len = len, + .speed_hz = spidev->speed_hz, }; struct spi_message m; @@ -152,6 +154,7 @@ spidev_sync_read(struct spidev_data *spidev, size_t len) struct spi_transfer t = { .rx_buf = spidev->rx_buffer, .len = len, + .speed_hz = spidev->speed_hz, }; struct spi_message m; @@ -274,6 +277,8 @@ static int spidev_message(struct spidev_data *spidev, k_tmp->bits_per_word = u_tmp->bits_per_word; k_tmp->delay_usecs = u_tmp->delay_usecs; k_tmp->speed_hz = u_tmp->speed_hz; + if (!k_tmp->speed_hz) + k_tmp->speed_hz = spidev->speed_hz; #ifdef VERBOSE dev_dbg(&spidev->spi->dev, " xfer len %zd %s%s%s%dbits %u usec %uHz\n", @@ -377,7 +382,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) retval = __put_user(spi->bits_per_word, (__u8 __user *)arg); break; case SPI_IOC_RD_MAX_SPEED_HZ: - retval = __put_user(spi->max_speed_hz, (__u32 __user *)arg); + retval = __put_user(spidev->speed_hz, (__u32 __user *)arg); break; /* write requests */ @@ -441,10 +446,11 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) spi->max_speed_hz = tmp; retval = spi_setup(spi); - if (retval < 0) - spi->max_speed_hz = save; + if (retval >= 0) + spidev->speed_hz = tmp; else dev_dbg(&spi->dev, "%d Hz (max)\n", tmp); + spi->max_speed_hz = save; } break; @@ -570,6 +576,8 @@ static int spidev_release(struct inode *inode, struct file *filp) kfree(spidev->rx_buffer); spidev->rx_buffer = NULL; + spidev->speed_hz = spidev->spi->max_speed_hz; + /* ... after we unbound from the underlying device? */ spin_lock_irq(&spidev->spi_lock); dofree = (spidev->spi == NULL); @@ -650,6 +658,8 @@ static int spidev_probe(struct spi_device *spi) } mutex_unlock(&device_list_lock); + spidev->speed_hz = spi->max_speed_hz; + if (status == 0) spi_set_drvdata(spi, spidev); else |