diff options
Diffstat (limited to 'drivers/input/touchscreen/cyttsp_spi.c')
| -rwxr-xr-x | drivers/input/touchscreen/cyttsp_spi.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/cyttsp_spi.c b/drivers/input/touchscreen/cyttsp_spi.c new file mode 100755 index 00000000000..d4f7ffeed1b --- /dev/null +++ b/drivers/input/touchscreen/cyttsp_spi.c @@ -0,0 +1,302 @@ +/* Source for: + * Cypress TrueTouch(TM) Standard Product I2C touchscreen driver. + * drivers/input/touchscreen/cyttsp_spi.c + * + * Copyright (C) 2009-2011 Cypress Semiconductor, Inc. + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * Cypress reserves the right to make changes without further notice + * to the materials described herein. Cypress does not assume any + * liability arising out of the application described herein. + * + * Contact Cypress Semiconductor at www.cypress.com + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/delay.h> +#include <linux/cyttsp.h> +#include "cyttsp_core.h" + +#define DBG(x) + +#define CY_SPI_WR_OP 0x00 /* r/~w */ +#define CY_SPI_RD_OP 0x01 +#define CY_SPI_CMD_BYTES 4 +#define CY_SPI_SYNC_BYTE 2 +#define CY_SPI_SYNC_ACK1 0x62 +#define CY_SPI_SYNC_ACK2 0x9D +#define CY_SPI_DATA_SIZE 128 +#define CY_SPI_DATA_BUF_SIZE (CY_SPI_CMD_BYTES + CY_SPI_DATA_SIZE) +#define CY_SPI_BITS_PER_WORD 8 + +struct cyttsp_spi { + struct cyttsp_bus_ops ops; + struct spi_device *spi_client; + void *ttsp_client; + u8 wr_buf[CY_SPI_DATA_BUF_SIZE]; + u8 rd_buf[CY_SPI_DATA_BUF_SIZE]; +}; + +static int cyttsp_spi_xfer_(u8 op, struct cyttsp_spi *ts_spi, + u8 reg, u8 *buf, int length) +{ + struct spi_message msg; + struct spi_transfer xfer[2]; + u8 *wr_buf = ts_spi->wr_buf; + u8 *rd_buf = ts_spi->rd_buf; + int retval; + DBG(printk(KERN_INFO "%s: Enter\n", __func__);) + if (length > CY_SPI_DATA_SIZE) { + printk(KERN_ERR "%s: length %d is too big.\n", + __func__, length); + return -EINVAL; + } + DBG(printk(KERN_INFO "%s: OP=%s length=%d\n", __func__, + op == CY_SPI_RD_OP ? "Read" : "Write", length);) + + memset(wr_buf, 0, CY_SPI_DATA_BUF_SIZE); + memset(rd_buf, 0, CY_SPI_DATA_BUF_SIZE); + + wr_buf[0] = 0x00; /* header byte 0 */ + wr_buf[1] = 0xFF; /* header byte 1 */ + wr_buf[2] = reg; /* reg index */ + wr_buf[3] = op; /* r/~w */ + if (op == CY_SPI_WR_OP) + memcpy(wr_buf + CY_SPI_CMD_BYTES, buf, length); + DBG( + if (op == CY_SPI_RD_OP) + memset(rd_buf, CY_SPI_SYNC_NACK, CY_SPI_DATA_BUF_SIZE);) + DBG( + for (i = 0; i < (length + CY_SPI_CMD_BYTES); i++) { + if ((op == CY_SPI_RD_OP) && (i < CY_SPI_CMD_BYTES)) + printk(KERN_INFO "%s: read op. wr[%d]:0x%02x\n", + __func__, i, wr_buf[i]); + if (op == CY_SPI_WR_OP) + printk(KERN_INFO "%s: write op. wr[%d]:0x%02x\n", + __func__, i, wr_buf[i]); + }) + + memset((void *)xfer, 0, sizeof(xfer)); + spi_message_init(&msg); + xfer[0].tx_buf = wr_buf; + xfer[0].rx_buf = rd_buf; + if (op == CY_SPI_WR_OP) { + xfer[0].len = length + CY_SPI_CMD_BYTES; + spi_message_add_tail(&xfer[0], &msg); + } else if (op == CY_SPI_RD_OP) { + xfer[0].len = CY_SPI_CMD_BYTES; + spi_message_add_tail(&xfer[0], &msg); + + xfer[1].rx_buf = buf; + xfer[1].len = length; + spi_message_add_tail(&xfer[1], &msg); + } + + retval = spi_sync(ts_spi->spi_client, &msg); + if (retval < 0) { + printk(KERN_ERR "%s: spi sync error %d, len=%d, op=%d\n", + __func__, retval, xfer[1].len, op); + retval = 0; + } + + if ((rd_buf[CY_SPI_SYNC_BYTE] == CY_SPI_SYNC_ACK1) && + (rd_buf[CY_SPI_SYNC_BYTE+1] == CY_SPI_SYNC_ACK2)) + retval = 0; + else { + DBG( + for (i = 0; i < (CY_SPI_CMD_BYTES); i++) + printk(KERN_INFO "%s: test rd_buf[%d]:0x%02x\n", + __func__, i, rd_buf[i]); + for (i = 0; i < (length); i++) + printk(KERN_INFO "%s: test buf[%d]:0x%02x\n", + __func__, i, buf[i]);) + retval = 1; + } + return retval; +} + +static int cyttsp_spi_xfer(u8 op, struct cyttsp_spi *ts, + u8 reg, u8 *buf, int length) +{ + int tries; + int retval; + DBG(printk(KERN_INFO "%s: Enter\n", __func__);) + + if (op == CY_SPI_RD_OP) { + for (tries = CY_NUM_RETRY; tries; tries--) { + retval = cyttsp_spi_xfer_(op, ts, reg, buf, length); + if (retval == 0) + break; + else + msleep(10); + } + } else { + retval = cyttsp_spi_xfer_(op, ts, reg, buf, length); + } + return retval; +} + +static s32 ttsp_spi_read_block_data(void *handle, u8 addr, + u8 length, void *data) +{ + int retval; + struct cyttsp_spi *ts = container_of(handle, struct cyttsp_spi, ops); + + DBG(printk(KERN_INFO "%s: Enter\n", __func__);) + + retval = cyttsp_spi_xfer(CY_SPI_RD_OP, ts, addr, data, length); + if (retval < 0) + printk(KERN_ERR "%s: ttsp_spi_read_block_data failed\n", + __func__); + + /* Do not print the above error if the data sync bytes were not found. + This is a normal condition for the bootloader loader startup and need + to retry until data sync bytes are found. */ + if (retval > 0) + retval = -1; /* now signal fail; so retry can be done */ + + return retval; +} + +static s32 ttsp_spi_write_block_data(void *handle, u8 addr, + u8 length, const void *data) +{ + int retval; + struct cyttsp_spi *ts = container_of(handle, struct cyttsp_spi, ops); + + DBG(printk(KERN_INFO "%s: Enter\n", __func__);) + + retval = cyttsp_spi_xfer(CY_SPI_WR_OP, ts, addr, (void *)data, length); + if (retval < 0) + printk(KERN_ERR "%s: ttsp_spi_write_block_data failed\n", + __func__); + + /* Do not print the above error if the data sync bytes were not found. + This is a normal condition for the bootloader loader startup and need + to retry until data sync bytes are found. */ + if (retval > 0) + retval = -1; /* now signal fail; so retry can be done */ + + return retval; +} + +static s32 ttsp_spi_tch_ext(void *handle, void *values) +{ + int retval = 0; + struct cyttsp_spi *ts = container_of(handle, struct cyttsp_spi, ops); + + DBG(printk(KERN_INFO "%s: Enter\n", __func__);) + + /* Add custom touch extension handling code here */ + /* set: retval < 0 for any returned system errors, + retval = 0 if normal touch handling is required, + retval > 0 if normal touch handling is *not* required */ + if (!ts || !values) + retval = -EIO; + + return retval; +} + +static int __devinit cyttsp_spi_probe(struct spi_device *spi) +{ + struct cyttsp_spi *ts_spi; + int retval; + DBG(printk(KERN_INFO"%s: Enter\n", __func__);) + + /* Set up SPI*/ + spi->bits_per_word = CY_SPI_BITS_PER_WORD; + spi->mode = SPI_MODE_0; + retval = spi_setup(spi); + if (retval < 0) { + printk(KERN_ERR "%s: SPI setup error %d\n", __func__, retval); + return retval; + } + ts_spi = kzalloc(sizeof(*ts_spi), GFP_KERNEL); + if (ts_spi == NULL) { + printk(KERN_ERR "%s: Error, kzalloc\n", __func__); + retval = -ENOMEM; + goto error_alloc_data_failed; + } + ts_spi->spi_client = spi; + dev_set_drvdata(&spi->dev, ts_spi); + ts_spi->ops.write = ttsp_spi_write_block_data; + ts_spi->ops.read = ttsp_spi_read_block_data; + ts_spi->ops.ext = ttsp_spi_tch_ext; + + ts_spi->ttsp_client = cyttsp_core_init(&ts_spi->ops, &spi->dev); + if (!ts_spi->ttsp_client) { + retval = -ENODEV; + goto ttsp_core_err; + } + printk(KERN_INFO "%s: Successful registration %s\n", + __func__, CY_SPI_NAME); + + return 0; + +ttsp_core_err: + kfree(ts_spi); +error_alloc_data_failed: + return retval; +} + +/* registered in driver struct */ +static int __devexit cyttsp_spi_remove(struct spi_device *spi) +{ + struct cyttsp_spi *ts_spi = dev_get_drvdata(&spi->dev); + DBG(printk(KERN_INFO"%s: Enter\n", __func__);) + cyttsp_core_release(ts_spi->ttsp_client); + kfree(ts_spi); + return 0; +} + + +static struct spi_driver cyttsp_spi_driver = { + .driver = { + .name = CY_SPI_NAME, + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = cyttsp_spi_probe, + .remove = __devexit_p(cyttsp_spi_remove), +}; + +static int __init cyttsp_spi_init(void) +{ + int err; + + err = spi_register_driver(&cyttsp_spi_driver); + printk(KERN_INFO "%s: Cypress TrueTouch(R) Standard Product SPI " + "Touchscreen Driver (Built %s @ %s) returned %d\n", + __func__, __DATE__, __TIME__, err); + + return err; +} +module_init(cyttsp_spi_init); + +static void __exit cyttsp_spi_exit(void) +{ + spi_unregister_driver(&cyttsp_spi_driver); + printk(KERN_INFO "%s: module exit\n", __func__); +} +module_exit(cyttsp_spi_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product SPI driver"); +MODULE_AUTHOR("Cypress"); + |