diff options
Diffstat (limited to 'drivers/input/touchscreen/cyttsp4_spi.c')
| -rw-r--r-- | drivers/input/touchscreen/cyttsp4_spi.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/drivers/input/touchscreen/cyttsp4_spi.c b/drivers/input/touchscreen/cyttsp4_spi.c deleted file mode 100644 index 944fbbe9113e..000000000000 --- a/drivers/input/touchscreen/cyttsp4_spi.c +++ /dev/null @@ -1,187 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Source for: - * Cypress TrueTouch(TM) Standard Product (TTSP) SPI touchscreen driver. - * For use with Cypress Txx4xx parts. - * Supported parts include: - * TMA4XX - * TMA1036 - * - * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. - * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> - * Copyright (C) 2013 Cypress Semiconductor - * - * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com> - */ - -#include "cyttsp4_core.h" - -#include <linux/delay.h> -#include <linux/input.h> -#include <linux/spi/spi.h> - -#define CY_SPI_WR_OP 0x00 /* r/~w */ -#define CY_SPI_RD_OP 0x01 -#define CY_SPI_BITS_PER_WORD 8 -#define CY_SPI_A8_BIT 0x02 -#define CY_SPI_WR_HEADER_BYTES 2 -#define CY_SPI_RD_HEADER_BYTES 1 -#define CY_SPI_CMD_BYTES 2 -#define CY_SPI_SYNC_BYTE 0 -#define CY_SPI_SYNC_ACK 0x62 /* from TRM *A protocol */ -#define CY_SPI_DATA_SIZE (2 * 256) - -#define CY_SPI_DATA_BUF_SIZE (CY_SPI_CMD_BYTES + CY_SPI_DATA_SIZE) - -static int cyttsp_spi_xfer(struct device *dev, u8 *xfer_buf, - u8 op, u16 reg, u8 *buf, int length) -{ - struct spi_device *spi = to_spi_device(dev); - struct spi_message msg; - struct spi_transfer xfer[2]; - u8 *wr_buf = &xfer_buf[0]; - u8 rd_buf[CY_SPI_CMD_BYTES]; - int retval; - int i; - - if (length > CY_SPI_DATA_SIZE) { - dev_err(dev, "%s: length %d is too big.\n", - __func__, length); - return -EINVAL; - } - - memset(wr_buf, 0, CY_SPI_DATA_BUF_SIZE); - memset(rd_buf, 0, CY_SPI_CMD_BYTES); - - wr_buf[0] = op + (((reg >> 8) & 0x1) ? CY_SPI_A8_BIT : 0); - if (op == CY_SPI_WR_OP) { - wr_buf[1] = reg & 0xFF; - if (length > 0) - memcpy(wr_buf + CY_SPI_CMD_BYTES, buf, length); - } - - memset(xfer, 0, sizeof(xfer)); - spi_message_init(&msg); - - /* - We set both TX and RX buffers because Cypress TTSP - requires full duplex operation. - */ - xfer[0].tx_buf = wr_buf; - xfer[0].rx_buf = rd_buf; - switch (op) { - case CY_SPI_WR_OP: - xfer[0].len = length + CY_SPI_CMD_BYTES; - spi_message_add_tail(&xfer[0], &msg); - break; - - case CY_SPI_RD_OP: - xfer[0].len = CY_SPI_RD_HEADER_BYTES; - spi_message_add_tail(&xfer[0], &msg); - - xfer[1].rx_buf = buf; - xfer[1].len = length; - spi_message_add_tail(&xfer[1], &msg); - break; - - default: - dev_err(dev, "%s: bad operation code=%d\n", __func__, op); - return -EINVAL; - } - - retval = spi_sync(spi, &msg); - if (retval < 0) { - dev_dbg(dev, "%s: spi_sync() error %d, len=%d, op=%d\n", - __func__, retval, xfer[1].len, op); - - /* - * do not return here since was a bad ACK sequence - * let the following ACK check handle any errors and - * allow silent retries - */ - } - - if (rd_buf[CY_SPI_SYNC_BYTE] != CY_SPI_SYNC_ACK) { - dev_dbg(dev, "%s: operation %d failed\n", __func__, op); - - for (i = 0; i < CY_SPI_CMD_BYTES; i++) - dev_dbg(dev, "%s: test rd_buf[%d]:0x%02x\n", - __func__, i, rd_buf[i]); - for (i = 0; i < length; i++) - dev_dbg(dev, "%s: test buf[%d]:0x%02x\n", - __func__, i, buf[i]); - - return -EIO; - } - - return 0; -} - -static int cyttsp_spi_read_block_data(struct device *dev, u8 *xfer_buf, - u16 addr, u8 length, void *data) -{ - int rc; - - rc = cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_WR_OP, addr, NULL, 0); - if (rc) - return rc; - else - return cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_RD_OP, addr, data, - length); -} - -static int cyttsp_spi_write_block_data(struct device *dev, u8 *xfer_buf, - u16 addr, u8 length, const void *data) -{ - return cyttsp_spi_xfer(dev, xfer_buf, CY_SPI_WR_OP, addr, (void *)data, - length); -} - -static const struct cyttsp4_bus_ops cyttsp_spi_bus_ops = { - .bustype = BUS_SPI, - .write = cyttsp_spi_write_block_data, - .read = cyttsp_spi_read_block_data, -}; - -static int cyttsp4_spi_probe(struct spi_device *spi) -{ - struct cyttsp4 *ts; - int error; - - /* Set up SPI*/ - spi->bits_per_word = CY_SPI_BITS_PER_WORD; - spi->mode = SPI_MODE_0; - error = spi_setup(spi); - if (error < 0) { - dev_err(&spi->dev, "%s: SPI setup error %d\n", - __func__, error); - return error; - } - - ts = cyttsp4_probe(&cyttsp_spi_bus_ops, &spi->dev, spi->irq, - CY_SPI_DATA_BUF_SIZE); - - return PTR_ERR_OR_ZERO(ts); -} - -static void cyttsp4_spi_remove(struct spi_device *spi) -{ - struct cyttsp4 *ts = spi_get_drvdata(spi); - cyttsp4_remove(ts); -} - -static struct spi_driver cyttsp4_spi_driver = { - .driver = { - .name = CYTTSP4_SPI_NAME, - .pm = pm_ptr(&cyttsp4_pm_ops), - }, - .probe = cyttsp4_spi_probe, - .remove = cyttsp4_spi_remove, -}; - -module_spi_driver(cyttsp4_spi_driver); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) SPI driver"); -MODULE_AUTHOR("Cypress"); -MODULE_ALIAS("spi:cyttsp4"); |