25162a4f64
The cyttsp4 touchscreen driver was contributed in 2013 and since then has seen no updates. The driver uses platform data (no device tree support) and there are no users of it in the mainline kernel. There were occasional fixes to it for issues either found by static code analysis tools or via visual inspection, but otherwise the driver is completely untested. Remove the driver. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://lore.kernel.org/r/ZrAZ2cUow_z838tp@google.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* cyttsp_i2c.c
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* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
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* For use with Cypress Txx3xx parts.
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* Supported parts include:
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* CY8CTST341
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* CY8CTMA340
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*
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* Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
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* Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
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*
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* Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
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*/
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#include "cyttsp_core.h"
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#include <linux/i2c.h>
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#include <linux/input.h>
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#define CY_I2C_NAME "cyttsp-i2c"
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#define CY_I2C_DATA_SIZE 128
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static int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf,
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u16 addr, u8 length, void *values)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 client_addr = client->addr | ((addr >> 8) & 0x1);
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u8 addr_lo = addr & 0xFF;
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struct i2c_msg msgs[] = {
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{
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.addr = client_addr,
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.flags = 0,
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.len = 1,
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.buf = &addr_lo,
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},
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{
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.addr = client_addr,
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.flags = I2C_M_RD,
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.len = length,
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.buf = values,
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},
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};
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int retval;
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retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (retval < 0)
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return retval;
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return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
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}
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static int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf,
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u16 addr, u8 length, const void *values)
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{
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struct i2c_client *client = to_i2c_client(dev);
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u8 client_addr = client->addr | ((addr >> 8) & 0x1);
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u8 addr_lo = addr & 0xFF;
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struct i2c_msg msgs[] = {
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{
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.addr = client_addr,
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.flags = 0,
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.len = length + 1,
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.buf = xfer_buf,
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},
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};
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int retval;
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xfer_buf[0] = addr_lo;
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memcpy(&xfer_buf[1], values, length);
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retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
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if (retval < 0)
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return retval;
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return retval != ARRAY_SIZE(msgs) ? -EIO : 0;
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}
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static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = {
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.bustype = BUS_I2C,
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.write = cyttsp_i2c_write_block_data,
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.read = cyttsp_i2c_read_block_data,
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};
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static int cyttsp_i2c_probe(struct i2c_client *client)
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{
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struct cyttsp *ts;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "I2C functionality not Supported\n");
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return -EIO;
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}
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ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq,
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CY_I2C_DATA_SIZE);
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if (IS_ERR(ts))
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return PTR_ERR(ts);
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i2c_set_clientdata(client, ts);
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return 0;
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}
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static const struct i2c_device_id cyttsp_i2c_id[] = {
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{ CY_I2C_NAME },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id);
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static const struct of_device_id cyttsp_of_i2c_match[] = {
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{ .compatible = "cypress,cy8ctma340", },
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{ .compatible = "cypress,cy8ctst341", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, cyttsp_of_i2c_match);
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static struct i2c_driver cyttsp_i2c_driver = {
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.driver = {
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.name = CY_I2C_NAME,
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.pm = pm_sleep_ptr(&cyttsp_pm_ops),
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.of_match_table = cyttsp_of_i2c_match,
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},
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.probe = cyttsp_i2c_probe,
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.id_table = cyttsp_i2c_id,
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};
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module_i2c_driver(cyttsp_i2c_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
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MODULE_AUTHOR("Cypress");
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