1 /* 2 * Copyright (c) 2004-2007 Marcus Overhagen <marcus@overhagen.de> 3 * 4 * Permission is hereby granted, free of charge, to any person 5 * obtaining a copy of this software and associated documentation 6 * files (the "Software"), to deal in the Software without restriction, 7 * including without limitation the rights to use, copy, modify, 8 * merge, publish, distribute, sublicense, and/or sell copies of 9 * the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice shall be 13 * included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 17 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 19 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 20 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 */ 24 25 #include "cx23882_i2c.h" 26 #include "i2c_core.h" 27 28 29 static void 30 set_scl(void *cookie, int state) 31 { 32 cx23882_device * device = cookie; 33 if (state) 34 device->i2c_reg |= I2C_SCL; 35 else 36 device->i2c_reg &= ~I2C_SCL; 37 reg_write32(REG_I2C_CONTROL, device->i2c_reg); 38 reg_read32(REG_I2C_CONTROL); // PCI bridge flush 39 } 40 41 42 static void 43 set_sda(void *cookie, int state) 44 { 45 cx23882_device * device = cookie; 46 if (state) 47 device->i2c_reg |= I2C_SDA; 48 else 49 device->i2c_reg &= ~I2C_SDA; 50 reg_write32(REG_I2C_CONTROL, device->i2c_reg); 51 reg_read32(REG_I2C_CONTROL); // PCI bridge flush 52 } 53 54 55 static int 56 get_scl(void *cookie) 57 { 58 cx23882_device * device = cookie; 59 return (reg_read32(REG_I2C_CONTROL) & I2C_SCL) >> 1; // I2C_SCL is 0x02 60 } 61 62 63 static int 64 get_sda(void *cookie) 65 { 66 cx23882_device * device = cookie; 67 return reg_read32(REG_I2C_CONTROL) & I2C_SDA; // I2C_SDA is 0x01 68 } 69 70 71 status_t 72 i2c_init(cx23882_device *device) 73 { 74 device->i2c_bus = i2c_create_bus(device, 80000, 2000000, set_scl, set_sda, get_scl, get_sda); 75 device->i2c_reg = reg_read32(REG_I2C_CONTROL); 76 device->i2c_reg &= ~I2C_HW_MODE; 77 device->i2c_reg |= I2C_SCL | I2C_SDA; 78 reg_write32(REG_I2C_CONTROL, device->i2c_reg); 79 reg_read32(REG_I2C_CONTROL); // PCI bridge flush 80 return device->i2c_bus ? B_OK : B_ERROR; 81 } 82 83 84 void 85 i2c_terminate(cx23882_device *device) 86 { 87 i2c_delete_bus(device->i2c_bus); 88 } 89 90 91