diff options
Diffstat (limited to 'drivers/media/dvb-frontends/drx39xyj/bsp_i2c.h')
| -rw-r--r-- | drivers/media/dvb-frontends/drx39xyj/bsp_i2c.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/drx39xyj/bsp_i2c.h b/drivers/media/dvb-frontends/drx39xyj/bsp_i2c.h new file mode 100644 index 00000000000..5b5421f7038 --- /dev/null +++ b/drivers/media/dvb-frontends/drx39xyj/bsp_i2c.h @@ -0,0 +1,139 @@ +/* + I2C API, implementation depends on board specifics + + Copyright (c), 2004-2005,2007-2010 Trident Microsystems, Inc. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + * Neither the name of Trident Microsystems nor Hauppauge Computer Works + nor the names of its contributors may be used to endorse or promote + products derived from this software without specific prior written + permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + + This module encapsulates I2C access.In some applications several devices + share one I2C bus. If these devices have the same I2C address some kind + off "switch" must be implemented to ensure error free communication with + one device. In case such a "switch" is used, the device ID can be used + to implement control over this "switch". +*/ + +#ifndef __BSPI2C_H__ +#define __BSPI2C_H__ + +#include "bsp_types.h" + +/* + * This structure contains the I2C address, the device ID and a user_data pointer. + * The user_data pointer can be used for application specific purposes. + */ +struct i2c_device_addr { + u16 i2c_addr; /* The I2C address of the device. */ + u16 i2c_dev_id; /* The device identifier. */ + void *user_data; /* User data pointer */ +}; + + +/** +* \def IS_I2C_10BIT( addr ) +* \brief Determine if I2C address 'addr' is a 10 bits address or not. +* \param addr The I2C address. +* \return int. +* \retval 0 if address is not a 10 bits I2C address. +* \retval 1 if address is a 10 bits I2C address. +*/ +#define IS_I2C_10BIT(addr) \ + (((addr) & 0xF8) == 0xF0) + +/*------------------------------------------------------------------------------ +Exported FUNCTIONS +------------------------------------------------------------------------------*/ + +/** +* \fn drxbsp_i2c_init() +* \brief Initialize I2C communication module. +* \return drx_status_t Return status. +* \retval 0 Initialization successful. +* \retval -EIO Initialization failed. +*/ + drx_status_t drxbsp_i2c_init(void); + +/** +* \fn drxbsp_i2c_term() +* \brief Terminate I2C communication module. +* \return drx_status_t Return status. +* \retval 0 Termination successful. +* \retval -EIO Termination failed. +*/ + drx_status_t drxbsp_i2c_term(void); + +/** +* \fn drx_status_t drxbsp_i2c_write_read( struct i2c_device_addr *w_dev_addr, +* u16 w_count, +* u8 *wData, +* struct i2c_device_addr *r_dev_addr, +* u16 r_count, +* u8 *r_data) +* \brief Read and/or write count bytes from I2C bus, store them in data[]. +* \param w_dev_addr The device i2c address and the device ID to write to +* \param w_count The number of bytes to write +* \param wData The array to write the data to +* \param r_dev_addr The device i2c address and the device ID to read from +* \param r_count The number of bytes to read +* \param r_data The array to read the data from +* \return drx_status_t Return status. +* \retval 0 Succes. +* \retval -EIO Failure. +* \retval -EINVAL Parameter 'wcount' is not zero but parameter +* 'wdata' contains NULL. +* Idem for 'rcount' and 'rdata'. +* Both w_dev_addr and r_dev_addr are NULL. +* +* This function must implement an atomic write and/or read action on the I2C bus +* No other process may use the I2C bus when this function is executing. +* The critical section of this function runs from and including the I2C +* write, up to and including the I2C read action. +* +* The device ID can be useful if several devices share an I2C address. +* It can be used to control a "switch" on the I2C bus to the correct device. +*/ + drx_status_t drxbsp_i2c_write_read(struct i2c_device_addr *w_dev_addr, + u16 w_count, + u8 *w_data, + struct i2c_device_addr *r_dev_addr, + u16 r_count, u8 *r_data); + +/** +* \fn drxbsp_i2c_error_text() +* \brief Returns a human readable error. +* Counter part of numerical drx_i2c_error_g. +* +* \return char* Pointer to human readable error text. +*/ + char *drxbsp_i2c_error_text(void); + +/** +* \var drx_i2c_error_g; +* \brief I2C specific error codes, platform dependent. +*/ + extern int drx_i2c_error_g; + +#endif /* __BSPI2C_H__ */ |