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85 lines
1.9 KiB
85 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* cyttsp_i2c_common.c |
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* Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. |
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* For use with Cypress Txx3xx and Txx4xx parts. |
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* Supported parts include: |
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* CY8CTST341 |
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* CY8CTMA340 |
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* TMA4XX |
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* TMA1036 |
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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 <[email protected]> |
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* |
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* Contact Cypress Semiconductor at www.cypress.com <[email protected]> |
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*/ |
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#include <linux/device.h> |
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#include <linux/export.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include "cyttsp4_core.h" |
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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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EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); |
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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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EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Cypress");
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