1 /* 2 * Source for: 3 * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. 4 * For use with Cypress Txx3xx parts. 5 * Supported parts include: 6 * CY8CTST341 7 * CY8CTMA340 8 * 9 * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. 10 * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * version 2, and only version 2, as published by the 15 * Free Software Foundation. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License along 23 * with this program; if not, write to the Free Software Foundation, Inc., 24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 25 * 26 * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com> 27 * 28 */ 29 30 #include "cyttsp_core.h" 31 32 #include <linux/i2c.h> 33 #include <linux/input.h> 34 35 #define CY_I2C_DATA_SIZE 128 36 37 static int cyttsp_i2c_read_block_data(struct cyttsp *ts, 38 u8 addr, u8 length, void *values) 39 { 40 struct i2c_client *client = to_i2c_client(ts->dev); 41 struct i2c_msg msgs[] = { 42 { 43 .addr = client->addr, 44 .flags = 0, 45 .len = 1, 46 .buf = &addr, 47 }, 48 { 49 .addr = client->addr, 50 .flags = I2C_M_RD, 51 .len = length, 52 .buf = values, 53 }, 54 }; 55 int retval; 56 57 retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 58 if (retval < 0) 59 return retval; 60 61 return retval != ARRAY_SIZE(msgs) ? -EIO : 0; 62 } 63 64 static int cyttsp_i2c_write_block_data(struct cyttsp *ts, 65 u8 addr, u8 length, const void *values) 66 { 67 struct i2c_client *client = to_i2c_client(ts->dev); 68 int retval; 69 70 ts->xfer_buf[0] = addr; 71 memcpy(&ts->xfer_buf[1], values, length); 72 73 retval = i2c_master_send(client, ts->xfer_buf, length + 1); 74 75 return retval < 0 ? retval : 0; 76 } 77 78 static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = { 79 .bustype = BUS_I2C, 80 .write = cyttsp_i2c_write_block_data, 81 .read = cyttsp_i2c_read_block_data, 82 }; 83 84 static int cyttsp_i2c_probe(struct i2c_client *client, 85 const struct i2c_device_id *id) 86 { 87 struct cyttsp *ts; 88 89 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 90 dev_err(&client->dev, "I2C functionality not Supported\n"); 91 return -EIO; 92 } 93 94 ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq, 95 CY_I2C_DATA_SIZE); 96 97 if (IS_ERR(ts)) 98 return PTR_ERR(ts); 99 100 i2c_set_clientdata(client, ts); 101 102 return 0; 103 } 104 105 static int cyttsp_i2c_remove(struct i2c_client *client) 106 { 107 struct cyttsp *ts = i2c_get_clientdata(client); 108 109 cyttsp_remove(ts); 110 111 return 0; 112 } 113 114 static const struct i2c_device_id cyttsp_i2c_id[] = { 115 { CY_I2C_NAME, 0 }, 116 { } 117 }; 118 MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id); 119 120 static struct i2c_driver cyttsp_i2c_driver = { 121 .driver = { 122 .name = CY_I2C_NAME, 123 .owner = THIS_MODULE, 124 .pm = &cyttsp_pm_ops, 125 }, 126 .probe = cyttsp_i2c_probe, 127 .remove = cyttsp_i2c_remove, 128 .id_table = cyttsp_i2c_id, 129 }; 130 131 module_i2c_driver(cyttsp_i2c_driver); 132 133 MODULE_LICENSE("GPL"); 134 MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver"); 135 MODULE_AUTHOR("Cypress"); 136 MODULE_ALIAS("i2c:cyttsp"); 137