drivers/spi/spi-lm70llp.c

96 static inline void deassertCS(struct spi_lm70llp *pp)
98 	u8 data = parport_read_data(pp->port);
101 	parport_write_data(pp->port, data | nCS);
104 static inline void assertCS(struct spi_lm70llp *pp)
106 	u8 data = parport_read_data(pp->port);
109 	parport_write_data(pp->port, data & ~nCS);
112 static inline void clkHigh(struct spi_lm70llp *pp)
114 	u8 data = parport_read_data(pp->port);
116 	parport_write_data(pp->port, data | SCLK);
119 static inline void clkLow(struct spi_lm70llp *pp)
121 	u8 data = parport_read_data(pp->port);
123 	parport_write_data(pp->port, data & ~SCLK);
135 	struct spi_lm70llp *pp = spidev_to_pp(s);
138 		clkHigh(pp);
140 		clkLow(pp);
160 	struct spi_lm70llp *pp = spidev_to_pp(s);
162 	return ((SIO == (parport_read_status(pp->port) & SIO)) ? 0 : 1);
171 	struct spi_lm70llp *pp = spidev_to_pp(spi);
174 		assertCS(pp);
176 		deassertCS(pp);
191 	struct spi_lm70llp	*pp;
205 	host = spi_alloc_host(p->physport->dev, sizeof(*pp));
210 	pp = spi_controller_get_devdata(host);
215 	pp->bitbang.ctlr = host;
216 	pp->bitbang.chipselect = lm70_chipselect;
217 	pp->bitbang.txrx_word[SPI_MODE_0] = lm70_txrx;
218 	pp->bitbang.flags = SPI_3WIRE;
223 	pp->port = p;
225 	lm70llp_cb.private = pp;
233 	pp->pd = pd;
242 	status = spi_bitbang_start(&pp->bitbang);
255 	strcpy(pp->info.modalias, "lm70");
256 	pp->info.max_speed_hz = 6 * 1000 * 1000;
257 	pp->info.chip_select = 0;
258 	pp->info.mode = SPI_3WIRE | SPI_MODE_0;
261 	parport_write_data(pp->port, lm70_INIT);
266 	pp->info.controller_data = pp;
267 	pp->spidev_lm70 = spi_new_device(pp->bitbang.ctlr, &pp->info);
268 	if (pp->spidev_lm70)
269 		dev_dbg(&pp->spidev_lm70->dev, "spidev_lm70 at %s\n",
270 			dev_name(&pp->spidev_lm70->dev));
276 	pp->spidev_lm70->bits_per_word = 8;
278 	lm70llp = pp;
282 	spi_bitbang_stop(&pp->bitbang);
285 	parport_write_data(pp->port, 0);
287 	parport_release(pp->pd);
298 	struct spi_lm70llp		*pp;
303 	pp = lm70llp;
304 	spi_bitbang_stop(&pp->bitbang);
307 	parport_write_data(pp->port, 0);
309 	parport_release(pp->pd);
310 	parport_unregister_device(pp->pd);
312 	spi_controller_put(pp->bitbang.ctlr);