bcm2835_spi_reset_hw(ctlr);
}
-static void bcm2835_spi_set_cs(struct spi_device *spi, bool gpio_level)
+static int chip_match_name(struct gpio_chip *chip, void *data)
{
- /*
- * we can assume that we are "native" as per spi_set_cs
- * calling us ONLY when cs_gpio is not set
- * we can also assume that we are CS < 3 as per bcm2835_spi_setup
- * we would not get called because of error handling there.
- * the level passed is the electrical level not enabled/disabled
- * so it has to get translated back to enable/disable
- * see spi_set_cs in spi.c for the implementation
- */
-
- struct spi_master *master = spi->master;
- struct bcm2835_spi *bs = spi_master_get_devdata(master);
- u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
- bool enable;
-
- /* calculate the enable flag from the passed gpio_level */
- enable = (spi->mode & SPI_CS_HIGH) ? gpio_level : !gpio_level;
-
- /* set flags for "reverse" polarity in the registers */
- if (spi->mode & SPI_CS_HIGH) {
- /* set the correct CS-bits */
- cs |= BCM2835_SPI_CS_CSPOL;
- cs |= BCM2835_SPI_CS_CSPOL0 << spi->chip_select;
- } else {
- /* clean the CS-bits */
- cs &= ~BCM2835_SPI_CS_CSPOL;
- cs &= ~(BCM2835_SPI_CS_CSPOL0 << spi->chip_select);
- }
-
- /* select the correct chip_select depending on disabled/enabled */
- if (enable) {
- /* set cs correctly */
- if (spi->mode & SPI_NO_CS) {
- /* use the "undefined" chip-select */
- cs |= BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01;
- } else {
- /* set the chip select */
- cs &= ~(BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01);
- cs |= spi->chip_select;
- }
- } else {
- /* disable CSPOL which puts HW-CS into deselected state */
- cs &= ~BCM2835_SPI_CS_CSPOL;
- /* use the "undefined" chip-select as precaution */
- cs |= BCM2835_SPI_CS_CS_10 | BCM2835_SPI_CS_CS_01;
- }
-
- /* finally set the calculated flags in SPI_CS */
- bcm2835_wr(bs, BCM2835_SPI_CS, cs);
+ return !strcmp(chip->label, data);
}
static int bcm2835_spi_setup(struct spi_device *spi)
ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
ctlr->num_chipselect = BCM2835_SPI_NUM_CS;
ctlr->setup = bcm2835_spi_setup;
- ctlr->set_cs = bcm2835_spi_set_cs;
ctlr->transfer_one = bcm2835_spi_transfer_one;
ctlr->handle_err = bcm2835_spi_handle_err;
ctlr->prepare_message = bcm2835_spi_prepare_message;