2  * AD7879/AD7889 touchscreen (SPI bus)
11 #include <linux/spi/spi.h>
30 static int ad7879_spi_xfer(struct spi_device *spi,  in ad7879_spi_xfer()  argument
72 	ret = spi_sync(spi, &msg);  in ad7879_spi_xfer()
85 	struct spi_device *spi = to_spi_device(dev);  in ad7879_spi_multi_read()  local
87 	return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf);  in ad7879_spi_multi_read()
92 	struct spi_device *spi = to_spi_device(dev);  in ad7879_spi_read()  local
95 	return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret;  in ad7879_spi_read()
100 	struct spi_device *spi = to_spi_device(dev);  in ad7879_spi_write()  local
103 	return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy);  in ad7879_spi_write()
113 static int __devinit ad7879_spi_probe(struct spi_device *spi)  in ad7879_spi_probe()  argument
118 	/* don't exceed max specified SPI CLK frequency */  in ad7879_spi_probe()
119 	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {  in ad7879_spi_probe()
120 		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);  in ad7879_spi_probe()
124 	spi->bits_per_word = 16;  in ad7879_spi_probe()
125 	err = spi_setup(spi);  in ad7879_spi_probe()
127 	        dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");  in ad7879_spi_probe()
131 	ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops);  in ad7879_spi_probe()
135 	spi_set_drvdata(spi, ts);  in ad7879_spi_probe()
140 static int __devexit ad7879_spi_remove(struct spi_device *spi)  in ad7879_spi_remove()  argument
142 	struct ad7879 *ts = spi_get_drvdata(spi);  in ad7879_spi_remove()
145 	spi_set_drvdata(spi, NULL);  in ad7879_spi_remove()
173 MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
175 MODULE_ALIAS("spi:ad7879");