Input: ad7879 - convert to use regmap
Instead of rolling our own infrastructure to provide uniform access to I2C and SPI buses, let's switch to using regmap. Reviewed-by: Michael Hennerich <michael.hennerich@analog.com> Tested-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>hifive-unleashed-5.1
Dmitry Torokhov
parent
a1b5359271
commit
404a24c35d
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@ -73,6 +73,7 @@ config TOUCHSCREEN_AD7879
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config TOUCHSCREEN_AD7879_I2C
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tristate "support I2C bus connection"
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depends on TOUCHSCREEN_AD7879 && I2C
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select REGMAP_I2C
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help
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Say Y here if you have AD7879-1/AD7889-1 hooked to an I2C bus.
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@ -82,6 +83,7 @@ config TOUCHSCREEN_AD7879_I2C
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config TOUCHSCREEN_AD7879_SPI
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tristate "support SPI bus connection"
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depends on TOUCHSCREEN_AD7879 && SPI_MASTER
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select REGMAP_SPI
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help
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Say Y here if you have AD7879-1/AD7889-1 hooked to a SPI bus.
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@ -12,53 +12,23 @@
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#include <linux/types.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/regmap.h>
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#include "ad7879.h"
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#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
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/* All registers are word-sized.
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* AD7879 uses a high-byte first convention.
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*/
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static int ad7879_i2c_read(struct device *dev, u8 reg)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_read_word_swapped(client, reg);
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}
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static int ad7879_i2c_multi_read(struct device *dev,
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u8 first_reg, u8 count, u16 *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 idx;
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i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
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for (idx = 0; idx < count; ++idx)
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buf[idx] = swab16(buf[idx]);
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return 0;
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}
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static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
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{
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struct i2c_client *client = to_i2c_client(dev);
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return i2c_smbus_write_word_swapped(client, reg, val);
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}
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static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
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.bustype = BUS_I2C,
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.read = ad7879_i2c_read,
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.multi_read = ad7879_i2c_multi_read,
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.write = ad7879_i2c_write,
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static const struct regmap_config ad7879_i2c_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = 15,
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};
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static int ad7879_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ad7879 *ts;
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struct regmap *regmap;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WORD_DATA)) {
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@ -66,8 +36,12 @@ static int ad7879_i2c_probe(struct i2c_client *client,
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return -EIO;
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}
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ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
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&ad7879_i2c_bus_ops);
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regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ts = ad7879_probe(&client->dev, regmap, client->irq,
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BUS_I2C, AD7879_DEVID);
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if (IS_ERR(ts))
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return PTR_ERR(ts);
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@ -11,109 +11,29 @@
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#include <linux/spi/spi.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include "ad7879.h"
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#define AD7879_DEVID 0x7A /* AD7879/AD7889 */
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#define MAX_SPI_FREQ_HZ 5000000
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#define AD7879_CMD_MAGIC 0xE000
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#define AD7879_CMD_READ (1 << 10)
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#define AD7879_CMD(reg) (AD7879_CMD_MAGIC | ((reg) & 0xF))
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#define AD7879_WRITECMD(reg) (AD7879_CMD(reg))
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#define AD7879_READCMD(reg) (AD7879_CMD(reg) | AD7879_CMD_READ)
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/*
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* ad7879_read/write are only used for initial setup and for sysfs controls.
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* The main traffic is done in ad7879_collect().
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*/
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#define AD7879_CMD_MAGIC 0xE0
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#define AD7879_CMD_READ BIT(2)
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static int ad7879_spi_xfer(struct spi_device *spi,
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u16 cmd, u8 count, u16 *tx_buf, u16 *rx_buf)
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{
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struct spi_message msg;
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struct spi_transfer *xfers;
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void *spi_data;
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u16 *command;
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u16 *_rx_buf = _rx_buf; /* shut gcc up */
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u8 idx;
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int ret;
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xfers = spi_data = kzalloc(sizeof(*xfers) * (count + 2), GFP_KERNEL);
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if (!spi_data)
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return -ENOMEM;
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spi_message_init(&msg);
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command = spi_data;
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command[0] = cmd;
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if (count == 1) {
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/* ad7879_spi_{read,write} gave us buf on stack */
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command[1] = *tx_buf;
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tx_buf = &command[1];
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_rx_buf = rx_buf;
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rx_buf = &command[2];
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}
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++xfers;
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xfers[0].tx_buf = command;
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xfers[0].len = 2;
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spi_message_add_tail(&xfers[0], &msg);
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++xfers;
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for (idx = 0; idx < count; ++idx) {
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if (rx_buf)
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xfers[idx].rx_buf = &rx_buf[idx];
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if (tx_buf)
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xfers[idx].tx_buf = &tx_buf[idx];
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xfers[idx].len = 2;
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spi_message_add_tail(&xfers[idx], &msg);
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}
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ret = spi_sync(spi, &msg);
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if (count == 1)
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_rx_buf[0] = command[2];
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kfree(spi_data);
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return ret;
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}
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static int ad7879_spi_multi_read(struct device *dev,
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u8 first_reg, u8 count, u16 *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf);
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}
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static int ad7879_spi_read(struct device *dev, u8 reg)
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{
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struct spi_device *spi = to_spi_device(dev);
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u16 ret, dummy;
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return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret;
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}
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static int ad7879_spi_write(struct device *dev, u8 reg, u16 val)
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{
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struct spi_device *spi = to_spi_device(dev);
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u16 dummy;
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return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy);
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}
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static const struct ad7879_bus_ops ad7879_spi_bus_ops = {
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.bustype = BUS_SPI,
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.read = ad7879_spi_read,
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.multi_read = ad7879_spi_multi_read,
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.write = ad7879_spi_write,
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static const struct regmap_config ad7879_spi_regmap_config = {
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.reg_bits = 16,
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.val_bits = 16,
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.max_register = 15,
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.read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ,
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.write_flag_mask = AD7879_CMD_MAGIC,
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};
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static int ad7879_spi_probe(struct spi_device *spi)
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{
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struct ad7879 *ts;
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struct regmap *regmap;
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int err;
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/* don't exceed max specified SPI CLK frequency */
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@ -125,11 +45,15 @@ static int ad7879_spi_probe(struct spi_device *spi)
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spi->bits_per_word = 16;
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err = spi_setup(spi);
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if (err) {
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dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
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return err;
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dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
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return err;
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}
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ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops);
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regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ts = ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID);
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if (IS_ERR(ts))
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return PTR_ERR(ts);
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@ -26,9 +26,8 @@
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/input/touchscreen.h>
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@ -106,8 +105,7 @@ enum {
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#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
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struct ad7879 {
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const struct ad7879_bus_ops *bops;
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struct regmap *regmap;
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struct device *dev;
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struct input_dev *input;
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struct timer_list timer;
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@ -137,17 +135,32 @@ struct ad7879 {
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static int ad7879_read(struct ad7879 *ts, u8 reg)
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{
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return ts->bops->read(ts->dev, reg);
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}
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unsigned int val;
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int error;
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static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf)
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{
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return ts->bops->multi_read(ts->dev, first_reg, count, buf);
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error = regmap_read(ts->regmap, reg, &val);
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if (error) {
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dev_err(ts->dev, "failed to read register %#02x: %d\n",
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reg, error);
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return error;
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}
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return val;
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}
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static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
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{
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return ts->bops->write(ts->dev, reg, val);
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int error;
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error = regmap_write(ts->regmap, reg, val);
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if (error) {
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dev_err(ts->dev,
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"failed to write %#04x to register %#02x: %d\n",
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val, reg, error);
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return error;
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}
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return 0;
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}
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static int ad7879_report(struct ad7879 *ts)
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@ -234,7 +247,8 @@ static irqreturn_t ad7879_irq(int irq, void *handle)
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{
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struct ad7879 *ts = handle;
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ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data);
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regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
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ts->conversion_data, AD7879_NR_SENSE);
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if (!ad7879_report(ts))
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mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
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@ -511,8 +525,8 @@ static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
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return 0;
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}
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struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
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const struct ad7879_bus_ops *bops)
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struct ad7879 *ad7879_probe(struct device *dev, struct regmap *regmap,
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int irq, u16 bustype, u8 devid)
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{
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struct ad7879_platform_data *pdata = dev_get_platdata(dev);
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struct ad7879 *ts;
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@ -520,7 +534,7 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
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int err;
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u16 revid;
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if (!irq) {
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if (irq <= 0) {
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dev_err(dev, "No IRQ specified\n");
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return ERR_PTR(-EINVAL);
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}
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@ -553,10 +567,10 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
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return ERR_PTR(-ENOMEM);
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}
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ts->bops = bops;
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ts->dev = dev;
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ts->input = input_dev;
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ts->irq = irq;
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ts->regmap = regmap;
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setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
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snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
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@ -564,7 +578,7 @@ struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
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input_dev->name = "AD7879 Touchscreen";
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input_dev->phys = ts->phys;
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input_dev->dev.parent = dev;
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input_dev->id.bustype = bops->bustype;
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input_dev->id.bustype = bustype;
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input_dev->open = ad7879_open;
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input_dev->close = ad7879_close;
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@ -13,18 +13,12 @@
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struct ad7879;
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struct device;
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struct ad7879_bus_ops {
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u16 bustype;
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int (*read)(struct device *dev, u8 reg);
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int (*multi_read)(struct device *dev, u8 first_reg, u8 count, u16 *buf);
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int (*write)(struct device *dev, u8 reg, u16 val);
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};
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struct regmap;
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extern const struct dev_pm_ops ad7879_pm_ops;
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struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned irq,
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const struct ad7879_bus_ops *bops);
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struct ad7879 *ad7879_probe(struct device *dev, struct regmap *regmap,
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int irq, u16 bustype, u8 devid);
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void ad7879_remove(struct ad7879 *);
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#endif
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