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path: root/drivers/input/touchscreen/ad7879-spi.c
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Diffstat (limited to 'drivers/input/touchscreen/ad7879-spi.c')
-rw-r--r--drivers/input/touchscreen/ad7879-spi.c131
1 files changed, 15 insertions, 116 deletions
diff --git a/drivers/input/touchscreen/ad7879-spi.c b/drivers/input/touchscreen/ad7879-spi.c
index d42b6b9af191..3457a5626d75 100644
--- a/drivers/input/touchscreen/ad7879-spi.c
+++ b/drivers/input/touchscreen/ad7879-spi.c
@@ -11,110 +11,28 @@
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/regmap.h>
#include "ad7879.h"
#define AD7879_DEVID 0x7A /* AD7879/AD7889 */
#define MAX_SPI_FREQ_HZ 5000000
-#define AD7879_CMD_MAGIC 0xE000
-#define AD7879_CMD_READ (1 << 10)
-#define AD7879_CMD(reg) (AD7879_CMD_MAGIC | ((reg) & 0xF))
-#define AD7879_WRITECMD(reg) (AD7879_CMD(reg))
-#define AD7879_READCMD(reg) (AD7879_CMD(reg) | AD7879_CMD_READ)
-/*
- * ad7879_read/write are only used for initial setup and for sysfs controls.
- * The main traffic is done in ad7879_collect().
- */
-
-static int ad7879_spi_xfer(struct spi_device *spi,
- u16 cmd, u8 count, u16 *tx_buf, u16 *rx_buf)
-{
- struct spi_message msg;
- struct spi_transfer *xfers;
- void *spi_data;
- u16 *command;
- u16 *_rx_buf = _rx_buf; /* shut gcc up */
- u8 idx;
- int ret;
-
- xfers = spi_data = kzalloc(sizeof(*xfers) * (count + 2), GFP_KERNEL);
- if (!spi_data)
- return -ENOMEM;
-
- spi_message_init(&msg);
-
- command = spi_data;
- command[0] = cmd;
- if (count == 1) {
- /* ad7879_spi_{read,write} gave us buf on stack */
- command[1] = *tx_buf;
- tx_buf = &command[1];
- _rx_buf = rx_buf;
- rx_buf = &command[2];
- }
-
- ++xfers;
- xfers[0].tx_buf = command;
- xfers[0].len = 2;
- spi_message_add_tail(&xfers[0], &msg);
- ++xfers;
-
- for (idx = 0; idx < count; ++idx) {
- if (rx_buf)
- xfers[idx].rx_buf = &rx_buf[idx];
- if (tx_buf)
- xfers[idx].tx_buf = &tx_buf[idx];
- xfers[idx].len = 2;
- spi_message_add_tail(&xfers[idx], &msg);
- }
-
- ret = spi_sync(spi, &msg);
-
- if (count == 1)
- _rx_buf[0] = command[2];
-
- kfree(spi_data);
-
- return ret;
-}
-
-static int ad7879_spi_multi_read(struct device *dev,
- u8 first_reg, u8 count, u16 *buf)
-{
- struct spi_device *spi = to_spi_device(dev);
+#define AD7879_CMD_MAGIC 0xE0
+#define AD7879_CMD_READ BIT(2)
- return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf);
-}
-
-static int ad7879_spi_read(struct device *dev, u8 reg)
-{
- struct spi_device *spi = to_spi_device(dev);
- u16 ret, dummy;
-
- return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret;
-}
-
-static int ad7879_spi_write(struct device *dev, u8 reg, u16 val)
-{
- struct spi_device *spi = to_spi_device(dev);
- u16 dummy;
-
- return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy);
-}
-
-static const struct ad7879_bus_ops ad7879_spi_bus_ops = {
- .bustype = BUS_SPI,
- .read = ad7879_spi_read,
- .multi_read = ad7879_spi_multi_read,
- .write = ad7879_spi_write,
+static const struct regmap_config ad7879_spi_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 16,
+ .max_register = 15,
+ .read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
+ .write_flag_mask = AD7879_CMD_MAGIC,
};
static int ad7879_spi_probe(struct spi_device *spi)
{
- struct ad7879 *ts;
- int err;
+ struct regmap *regmap;
/* don't exceed max specified SPI CLK frequency */
if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
@@ -122,29 +40,11 @@ static int ad7879_spi_probe(struct spi_device *spi)
return -EINVAL;
}
- spi->bits_per_word = 16;
- err = spi_setup(spi);
- if (err) {
- dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
- return err;
- }
-
- ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops);
- if (IS_ERR(ts))
- return PTR_ERR(ts);
-
- spi_set_drvdata(spi, ts);
-
- return 0;
-}
-
-static int ad7879_spi_remove(struct spi_device *spi)
-{
- struct ad7879 *ts = spi_get_drvdata(spi);
-
- ad7879_remove(ts);
+ regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
- return 0;
+ return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
}
#ifdef CONFIG_OF
@@ -162,12 +62,11 @@ static struct spi_driver ad7879_spi_driver = {
.of_match_table = of_match_ptr(ad7879_spi_dt_ids),
},
.probe = ad7879_spi_probe,
- .remove = ad7879_spi_remove,
};
module_spi_driver(ad7879_spi_driver);
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad7879");