1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/cyttsp4_spi.c b/drivers/input/touchscreen/cyttsp4_spi.c
new file mode 100644
index 000000000000..f8f891bead34
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp4_spi.c
@@ -0,0 +1,205 @@
+/*
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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, u8 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);
+
+        if (reg > 255)
+                wr_buf[0] = op + CY_SPI_A8_BIT;
+        else
+                wr_buf[0] = op;
+        if (op == CY_SPI_WR_OP)
+                wr_buf[1] = reg % 256;
+        if (op == CY_SPI_WR_OP && 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,
+                                      u8 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,
+                                       u8 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);
+
+        if (IS_ERR(ts))
+                return PTR_ERR(ts);
+
+        return 0;
+}
+
+static int cyttsp4_spi_remove(struct spi_device *spi)
+{
+        struct cyttsp4 *ts = spi_get_drvdata(spi);
+        cyttsp4_remove(ts);
+
+        return 0;
+}
+
+static struct spi_driver cyttsp4_spi_driver = {
+        .driver = {
+                .name   = CYTTSP4_SPI_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &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");