^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * AD714X CapTouch Programmable Controller driver (SPI bus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2009-2011 Analog Devices Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/input.h> /* BUS_SPI */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "ad714x.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define AD714x_SPI_READ BIT(10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int __maybe_unused ad714x_spi_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static int __maybe_unused ad714x_spi_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int ad714x_spi_read(struct ad714x_chip *chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned short reg, unsigned short *data, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct spi_device *spi = to_spi_device(chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct spi_message message;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct spi_transfer xfer[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) spi_message_init(&message);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) memset(xfer, 0, sizeof(xfer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) AD714x_SPI_READ | reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) xfer[0].tx_buf = &chip->xfer_buf[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) xfer[0].len = sizeof(chip->xfer_buf[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) spi_message_add_tail(&xfer[0], &message);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) xfer[1].rx_buf = &chip->xfer_buf[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) spi_message_add_tail(&xfer[1], &message);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) error = spi_sync(spi, &message);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (unlikely(error)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) dev_err(chip->dev, "SPI read error: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) for (i = 0; i < len; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int ad714x_spi_write(struct ad714x_chip *chip,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned short reg, unsigned short data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct spi_device *spi = to_spi_device(chip->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) chip->xfer_buf[1] = cpu_to_be16(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) error = spi_write(spi, (u8 *)chip->xfer_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 2 * sizeof(*chip->xfer_buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (unlikely(error)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) dev_err(chip->dev, "SPI write error: %d\n", error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int ad714x_spi_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct ad714x_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) spi->bits_per_word = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) err = spi_setup(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ad714x_spi_read, ad714x_spi_write);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (IS_ERR(chip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return PTR_ERR(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spi_set_drvdata(spi, chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static struct spi_driver ad714x_spi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .name = "ad714x_captouch",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) .pm = &ad714x_spi_pm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) .probe = ad714x_spi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) module_spi_driver(ad714x_spi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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