Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Ferruh Yigit | 803 | 99.14% | 2 | 33.33% |
Jonathan Cameron | 3 | 0.37% | 1 | 16.67% |
Thomas Gleixner | 2 | 0.25% | 1 | 16.67% |
Duan Jiong | 1 | 0.12% | 1 | 16.67% |
Uwe Kleine-König | 1 | 0.12% | 1 | 16.67% |
Total | 810 | 6 |
// 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");
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