src/add-ons/kernel/drivers/dvb/cx23882/cx23882_i2c.c

   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