drivers/spi/spi-bitbang.c

16 #include <linux/spi/spi.h>
17 #include <linux/spi/spi_bitbang.h>
43 	u32		(*txrx_word)(struct spi_device *spi, unsigned nsecs,
47 						struct spi_device *spi,
56 	struct spi_device	*spi,
57 	u32			(*txrx_word)(struct spi_device *spi,
76 		word = txrx_word(spi, ns, word, bits, flags);
85 	struct spi_device	*spi,
86 	u32			(*txrx_word)(struct spi_device *spi,
105 		word = txrx_word(spi, ns, word, bits, flags);
114 	struct spi_device	*spi,
115 	u32			(*txrx_word)(struct spi_device *spi,
134 		word = txrx_word(spi, ns, word, bits, flags);
142 int spi_bitbang_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
144 	struct spi_bitbang_cs	*cs = spi->controller_state;
158 		bits_per_word = spi->bits_per_word;
170 		hz = spi->max_speed_hz;
184 int spi_bitbang_setup(struct spi_device *spi)
186 	struct spi_bitbang_cs	*cs = spi->controller_state;
191 	bitbang = spi_controller_get_devdata(spi->controller);
197 		spi->controller_state = cs;
202 	cs->txrx_word = bitbang->txrx_word[spi->mode & (SPI_CPOL|SPI_CPHA)];
209 		retval = bitbang->setup_transfer(spi, NULL);
214 	dev_dbg(&spi->dev, "%s, %u nsec/bit\n", __func__, 2 * cs->nsecs);
228 void spi_bitbang_cleanup(struct spi_device *spi)
230 	kfree(spi->controller_state);
234 static int spi_bitbang_bufs(struct spi_device *spi, struct spi_transfer *t)
236 	struct spi_bitbang_cs	*cs = spi->controller_state;
240 	bitbang = spi_controller_get_devdata(spi->controller);
244 		err = bitbang->set_line_direction(spi, !!(t->tx_buf));
249 	if (spi->mode & SPI_3WIRE) {
253 		return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, flags);
255 	return cs->txrx_bufs(spi, cs->txrx_word, nsecs, t, 0);
272 static int spi_bitbang_prepare_hardware(struct spi_controller *spi)
276 	bitbang = spi_controller_get_devdata(spi);
286 				    struct spi_device *spi,
293 		status = bitbang->setup_transfer(spi, transfer);
299 		status = bitbang->txrx_bufs(spi, transfer);
312 static int spi_bitbang_unprepare_hardware(struct spi_controller *spi)
316 	bitbang = spi_controller_get_devdata(spi);
325 static void spi_bitbang_set_cs(struct spi_device *spi, bool enable)
327 	struct spi_bitbang *bitbang = spi_controller_get_devdata(spi->controller);
331 	 * spi device driver takes care of handling SPI_CS_HIGH
333 	enable = (!!(spi->mode & SPI_CS_HIGH) == enable);
336 	bitbang->chipselect(spi, enable ? BITBANG_CS_ACTIVE :
445  * spi_bitbang_stop - stops the task providing spi communication