diff options
Diffstat (limited to 'drivers/input/touchscreen/cyttsp_i2c.c')
| -rw-r--r-- | drivers/input/touchscreen/cyttsp_i2c.c | 84 |
1 files changed, 69 insertions, 15 deletions
diff --git a/drivers/input/touchscreen/cyttsp_i2c.c b/drivers/input/touchscreen/cyttsp_i2c.c index 1edfdba96ede..cb15600549cd 100644 --- a/drivers/input/touchscreen/cyttsp_i2c.c +++ b/drivers/input/touchscreen/cyttsp_i2c.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * cyttsp_i2c.c * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. @@ -9,18 +10,7 @@ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> * - * 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. - * * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com> - * */ #include "cyttsp_core.h" @@ -28,16 +18,72 @@ #include <linux/i2c.h> #include <linux/input.h> +#define CY_I2C_NAME "cyttsp-i2c" + #define CY_I2C_DATA_SIZE 128 +static int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, + u16 addr, u8 length, void *values) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 client_addr = client->addr | ((addr >> 8) & 0x1); + u8 addr_lo = addr & 0xFF; + struct i2c_msg msgs[] = { + { + .addr = client_addr, + .flags = 0, + .len = 1, + .buf = &addr_lo, + }, + { + .addr = client_addr, + .flags = I2C_M_RD, + .len = length, + .buf = values, + }, + }; + int retval; + + retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (retval < 0) + return retval; + + return retval != ARRAY_SIZE(msgs) ? -EIO : 0; +} + +static int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, + u16 addr, u8 length, const void *values) +{ + struct i2c_client *client = to_i2c_client(dev); + u8 client_addr = client->addr | ((addr >> 8) & 0x1); + u8 addr_lo = addr & 0xFF; + struct i2c_msg msgs[] = { + { + .addr = client_addr, + .flags = 0, + .len = length + 1, + .buf = xfer_buf, + }, + }; + int retval; + + xfer_buf[0] = addr_lo; + memcpy(&xfer_buf[1], values, length); + + retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); + if (retval < 0) + return retval; + + return retval != ARRAY_SIZE(msgs) ? -EIO : 0; +} + static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = { .bustype = BUS_I2C, .write = cyttsp_i2c_write_block_data, .read = cyttsp_i2c_read_block_data, }; -static int cyttsp_i2c_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int cyttsp_i2c_probe(struct i2c_client *client) { struct cyttsp *ts; @@ -57,15 +103,23 @@ static int cyttsp_i2c_probe(struct i2c_client *client, } static const struct i2c_device_id cyttsp_i2c_id[] = { - { CY_I2C_NAME, 0 }, + { CY_I2C_NAME }, { } }; MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id); +static const struct of_device_id cyttsp_of_i2c_match[] = { + { .compatible = "cypress,cy8ctma340", }, + { .compatible = "cypress,cy8ctst341", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, cyttsp_of_i2c_match); + static struct i2c_driver cyttsp_i2c_driver = { .driver = { .name = CY_I2C_NAME, - .pm = &cyttsp_pm_ops, + .pm = pm_sleep_ptr(&cyttsp_pm_ops), + .of_match_table = cyttsp_of_i2c_match, }, .probe = cyttsp_i2c_probe, .id_table = cyttsp_i2c_id, |