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115 lines
2.7 KiB
115 lines
2.7 KiB
// 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 __maybe_unused ad714x_spi_suspend(struct device *dev) |
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{ |
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return ad714x_disable(spi_get_drvdata(to_spi_device(dev))); |
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} |
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static int __maybe_unused ad714x_spi_resume(struct device *dev) |
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{ |
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return ad714x_enable(spi_get_drvdata(to_spi_device(dev))); |
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} |
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static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume); |
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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 = &ad714x_spi_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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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