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c0a150eee3
The I2C and SPI PM callbacks were identical (though wrapped in some bouncing out to the bus specific container of the struct device and then back again to get the drvdata). As such rather than just moving these to SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() take the opportunity to unify the struct dev_pm_ops and use the new EXPORT_SIMPLE_DEV_PM_OPS() macro so that we can drop the unused suspend and resume callbacks as well as the structure if !CONFIG_PM_SLEEP without needing to mark the callbacks __maybe_unused. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Michael Hennerich <michael.hennerich@analog.com> Link: https://lore.kernel.org/r/20230114171620.42891-8-jic23@kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AD714X CapTouch Programmable Controller driver (SPI bus)
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*
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* Copyright 2009-2011 Analog Devices Inc.
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*/
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#include <linux/input.h> /* BUS_SPI */
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/pm.h>
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#include <linux/types.h>
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#include "ad714x.h"
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#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
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#define AD714x_SPI_READ BIT(10)
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static int ad714x_spi_read(struct ad714x_chip *chip,
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unsigned short reg, unsigned short *data, size_t len)
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{
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struct spi_device *spi = to_spi_device(chip->dev);
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struct spi_message message;
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struct spi_transfer xfer[2];
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int i;
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int error;
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spi_message_init(&message);
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memset(xfer, 0, sizeof(xfer));
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chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
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AD714x_SPI_READ | reg);
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xfer[0].tx_buf = &chip->xfer_buf[0];
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xfer[0].len = sizeof(chip->xfer_buf[0]);
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spi_message_add_tail(&xfer[0], &message);
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xfer[1].rx_buf = &chip->xfer_buf[1];
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xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
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spi_message_add_tail(&xfer[1], &message);
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error = spi_sync(spi, &message);
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if (unlikely(error)) {
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dev_err(chip->dev, "SPI read error: %d\n", error);
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return error;
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}
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for (i = 0; i < len; i++)
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data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
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return 0;
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}
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static int ad714x_spi_write(struct ad714x_chip *chip,
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unsigned short reg, unsigned short data)
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{
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struct spi_device *spi = to_spi_device(chip->dev);
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int error;
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chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
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chip->xfer_buf[1] = cpu_to_be16(data);
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error = spi_write(spi, (u8 *)chip->xfer_buf,
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2 * sizeof(*chip->xfer_buf));
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if (unlikely(error)) {
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dev_err(chip->dev, "SPI write error: %d\n", 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 ad714x_spi_probe(struct spi_device *spi)
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{
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struct ad714x_chip *chip;
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int err;
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spi->bits_per_word = 8;
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err = spi_setup(spi);
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if (err < 0)
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return err;
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chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
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ad714x_spi_read, ad714x_spi_write);
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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spi_set_drvdata(spi, chip);
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return 0;
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}
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static struct spi_driver ad714x_spi_driver = {
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.driver = {
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.name = "ad714x_captouch",
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.pm = pm_sleep_ptr(&ad714x_pm),
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},
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.probe = ad714x_spi_probe,
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};
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module_spi_driver(ad714x_spi_driver);
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MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_LICENSE("GPL");
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