| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * cyttsp_i2c_common.c |
| 4 | * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. |
| 5 | * For use with Cypress Txx3xx and Txx4xx parts. |
| 6 | * Supported parts include: |
| 7 | * CY8CTST341 |
| 8 | * CY8CTMA340 |
| 9 | * TMA4XX |
| 10 | * TMA1036 |
| 11 | * |
| 12 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. |
| 13 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> |
| 14 | * |
| 15 | * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com> |
| 16 | */ |
| 17 | |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/export.h> |
| 20 | #include <linux/i2c.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/types.h> |
| 23 | |
| 24 | #include "cyttsp4_core.h" |
| 25 | |
| 26 | int cyttsp_i2c_read_block_data(struct device *dev, u8 *xfer_buf, |
| 27 | u16 addr, u8 length, void *values) |
| 28 | { |
| 29 | struct i2c_client *client = to_i2c_client(dev); |
| 30 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
| 31 | u8 addr_lo = addr & 0xFF; |
| 32 | struct i2c_msg msgs[] = { |
| 33 | { |
| 34 | .addr = client_addr, |
| 35 | .flags = 0, |
| 36 | .len = 1, |
| 37 | .buf = &addr_lo, |
| 38 | }, |
| 39 | { |
| 40 | .addr = client_addr, |
| 41 | .flags = I2C_M_RD, |
| 42 | .len = length, |
| 43 | .buf = values, |
| 44 | }, |
| 45 | }; |
| 46 | int retval; |
| 47 | |
| 48 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 49 | if (retval < 0) |
| 50 | return retval; |
| 51 | |
| 52 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
| 53 | } |
| 54 | EXPORT_SYMBOL_GPL(cyttsp_i2c_read_block_data); |
| 55 | |
| 56 | int cyttsp_i2c_write_block_data(struct device *dev, u8 *xfer_buf, |
| 57 | u16 addr, u8 length, const void *values) |
| 58 | { |
| 59 | struct i2c_client *client = to_i2c_client(dev); |
| 60 | u8 client_addr = client->addr | ((addr >> 8) & 0x1); |
| 61 | u8 addr_lo = addr & 0xFF; |
| 62 | struct i2c_msg msgs[] = { |
| 63 | { |
| 64 | .addr = client_addr, |
| 65 | .flags = 0, |
| 66 | .len = length + 1, |
| 67 | .buf = xfer_buf, |
| 68 | }, |
| 69 | }; |
| 70 | int retval; |
| 71 | |
| 72 | xfer_buf[0] = addr_lo; |
| 73 | memcpy(&xfer_buf[1], values, length); |
| 74 | |
| 75 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 76 | if (retval < 0) |
| 77 | return retval; |
| 78 | |
| 79 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
| 80 | } |
| 81 | EXPORT_SYMBOL_GPL(cyttsp_i2c_write_block_data); |
| 82 | |
| 83 | |
| 84 | MODULE_LICENSE("GPL"); |
| 85 | MODULE_AUTHOR("Cypress"); |