133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
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// 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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