mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)andDmitry Torokhov
47ceab218c
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20260515164848.497608-2-u.kleine-koenig@baylibre.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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{ .name = 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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