/*
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* cyttsp5_spi.c
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* Parade TrueTouch(TM) Standard Product V5 SPI Module.
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* For use with Parade touchscreen controllers.
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* Supported parts include:
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* CYTMA5XX
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* CYTMA448
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* CYTMA445A
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* CYTT21XXX
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* CYTT31XXX
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*
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* Copyright (C) 2015 Parade Technologies
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* Copyright (C) 2012-2015 Cypress Semiconductor
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, and only version 2, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contact Parade Technologies at www.paradetech.com <ttdrivers@paradetech.com>
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*
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*/
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#include "cyttsp5_regs.h"
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#include <linux/spi/spi.h>
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#include <linux/version.h>
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#define CY_SPI_WR_OP 0x00 /* r/~w */
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#define CY_SPI_RD_OP 0x01
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#define CY_SPI_BITS_PER_WORD 8
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#define CY_SPI_SYNC_ACK 0x62
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#define CY_SPI_CMD_BYTES 0
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#define CY_SPI_DATA_SIZE (2 * 256)
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#define CY_SPI_DATA_BUF_SIZE (CY_SPI_CMD_BYTES + CY_SPI_DATA_SIZE)
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static void cyttsp5_spi_add_rw_msg(struct spi_message *msg,
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struct spi_transfer *xfer, u8 *w_header, u8 *r_header, u8 op)
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{
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xfer->tx_buf = w_header;
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xfer->rx_buf = r_header;
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w_header[0] = op;
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xfer->len = 1;
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spi_message_add_tail(xfer, msg);
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}
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static int cyttsp5_spi_xfer(struct device *dev, u8 op, u8 *buf, int length)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct spi_message msg;
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struct spi_transfer xfer[2];
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u8 w_header[2];
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u8 r_header[2];
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int rc;
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memset(xfer, 0, sizeof(xfer));
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spi_message_init(&msg);
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cyttsp5_spi_add_rw_msg(&msg, &xfer[0], w_header, r_header, op);
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switch (op) {
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case CY_SPI_RD_OP:
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xfer[1].rx_buf = buf;
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xfer[1].len = length;
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spi_message_add_tail(&xfer[1], &msg);
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break;
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case CY_SPI_WR_OP:
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xfer[1].tx_buf = buf;
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xfer[1].len = length;
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spi_message_add_tail(&xfer[1], &msg);
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break;
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default:
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rc = -EIO;
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goto exit;
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}
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rc = spi_sync(spi, &msg);
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exit:
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if (rc < 0)
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parade_debug(dev, DEBUG_LEVEL_2, "%s: spi_sync() error %d\n",
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__func__, rc);
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if (r_header[0] != CY_SPI_SYNC_ACK)
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return -EIO;
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return rc;
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}
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static int cyttsp5_spi_read_default(struct device *dev, void *buf, int size)
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{
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if (!buf || !size)
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return 0;
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return cyttsp5_spi_xfer(dev, CY_SPI_RD_OP, buf, size);
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}
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static int cyttsp5_spi_read_default_nosize(struct device *dev, u8 *buf, u32 max)
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{
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u32 size;
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int rc;
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if (!buf)
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return 0;
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rc = cyttsp5_spi_xfer(dev, CY_SPI_RD_OP, buf, 2);
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if (rc < 0)
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return rc;
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size = get_unaligned_le16(&buf[0]);
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if (!size)
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return rc;
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if (size > max)
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return -EINVAL;
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return cyttsp5_spi_read_default(dev, buf, size);
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}
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static int cyttsp5_spi_write_read_specific(struct device *dev, u8 write_len,
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u8 *write_buf, u8 *read_buf)
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{
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int rc;
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rc = cyttsp5_spi_xfer(dev, CY_SPI_WR_OP, write_buf, write_len);
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if (rc < 0)
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return rc;
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if (read_buf)
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rc = cyttsp5_spi_read_default_nosize(dev, read_buf,
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CY_SPI_DATA_SIZE);
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return rc;
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}
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static struct cyttsp5_bus_ops cyttsp5_spi_bus_ops = {
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.bustype = BUS_SPI,
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.read_default = cyttsp5_spi_read_default,
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.read_default_nosize = cyttsp5_spi_read_default_nosize,
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.write_read_specific = cyttsp5_spi_write_read_specific,
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};
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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static const struct of_device_id cyttsp5_spi_of_match[] = {
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{ .compatible = "cy,cyttsp5_spi_adapter", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, cyttsp5_spi_of_match);
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#endif
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static int cyttsp5_spi_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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const struct of_device_id *match;
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#endif
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int rc;
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/* Set up SPI*/
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spi->bits_per_word = CY_SPI_BITS_PER_WORD;
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spi->mode = SPI_MODE_0;
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rc = spi_setup(spi);
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if (rc < 0) {
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dev_err(dev, "%s: SPI setup error %d\n", __func__, rc);
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return rc;
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}
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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match = of_match_device(of_match_ptr(cyttsp5_spi_of_match), dev);
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if (match) {
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rc = cyttsp5_devtree_create_and_get_pdata(dev);
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if (rc < 0)
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return rc;
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}
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#endif
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rc = cyttsp5_probe(&cyttsp5_spi_bus_ops, &spi->dev, spi->irq,
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CY_SPI_DATA_BUF_SIZE);
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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if (rc && match)
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cyttsp5_devtree_clean_pdata(dev);
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#endif
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return rc;
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}
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static int cyttsp5_spi_remove(struct spi_device *spi)
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{
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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struct device *dev = &spi->dev;
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const struct of_device_id *match;
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#endif
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struct cyttsp5_core_data *cd = dev_get_drvdata(&spi->dev);
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cyttsp5_release(cd);
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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match = of_match_device(of_match_ptr(cyttsp5_spi_of_match), dev);
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if (match)
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cyttsp5_devtree_clean_pdata(dev);
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#endif
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return 0;
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}
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static const struct spi_device_id cyttsp5_spi_id[] = {
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{ CYTTSP5_SPI_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, cyttsp5_spi_id);
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static struct spi_driver cyttsp5_spi_driver = {
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.driver = {
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.name = CYTTSP5_SPI_NAME,
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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.pm = &cyttsp5_pm_ops,
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#ifdef CONFIG_TOUCHSCREEN_CYPRESS_CYTTSP5_DEVICETREE_SUPPORT
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.of_match_table = cyttsp5_spi_of_match,
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#endif
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},
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.probe = cyttsp5_spi_probe,
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.remove = (cyttsp5_spi_remove),
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.id_table = cyttsp5_spi_id,
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};
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#if (KERNEL_VERSION(3, 3, 0) <= LINUX_VERSION_CODE)
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module_spi_driver(cyttsp5_spi_driver);
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#else
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static int __init cyttsp5_spi_init(void)
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{
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int err = spi_register_driver(&cyttsp5_spi_driver);
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pr_info("%s: Parade TTSP SPI Driver (Built %s) rc=%d\n",
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__func__, CY_DRIVER_VERSION, err);
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return err;
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}
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module_init(cyttsp5_spi_init);
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static void __exit cyttsp5_spi_exit(void)
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{
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spi_unregister_driver(&cyttsp5_spi_driver);
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}
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module_exit(cyttsp5_spi_exit);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Parade TrueTouch(R) Standard Product SPI Driver");
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MODULE_AUTHOR("Parade Technologies <ttdrivers@paradetech.com>");
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