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402 lines
11 KiB
402 lines
11 KiB
/*!
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* @section LICENSE
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* (C) Copyright 2011~2016 Bosch Sensortec GmbH All Rights Reserved
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*
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* (C) Modification Copyright 2018 Robert Bosch Kft All Rights Reserved
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*
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* This software program is licensed subject to the GNU General
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* Public License (GPL).Version 2,June 1991,
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* available at http://www.fsf.org/copyleft/gpl.html
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*
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* Special: Description of the Software:
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*
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* This software module (hereinafter called "Software") and any
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* information on application-sheets (hereinafter called "Information") is
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* provided free of charge for the sole purpose to support your application
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* work.
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*
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* As such, the Software is merely an experimental software, not tested for
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* safety in the field and only intended for inspiration for further development
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* and testing. Any usage in a safety-relevant field of use (like automotive,
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* seafaring, spacefaring, industrial plants etc.) was not intended, so there are
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* no precautions for such usage incorporated in the Software.
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*
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* The Software is specifically designed for the exclusive use for Bosch
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* Sensortec products by personnel who have special experience and training. Do
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* not use this Software if you do not have the proper experience or training.
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*
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* This Software package is provided as is and without any expressed or
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* implied warranties, including without limitation, the implied warranties of
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* merchantability and fitness for a particular purpose.
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*
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* Bosch Sensortec and their representatives and agents deny any liability for
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* the functional impairment of this Software in terms of fitness, performance
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* and safety. Bosch Sensortec and their representatives and agents shall not be
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* liable for any direct or indirect damages or injury, except as otherwise
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* stipulated in mandatory applicable law.
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* The Information provided is believed to be accurate and reliable. Bosch
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* Sensortec assumes no responsibility for the consequences of use of such
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* Information nor for any infringement of patents or other rights of third
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* parties which may result from its use.
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*
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*------------------------------------------------------------------------------
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* The following Product Disclaimer does not apply to the BSX4-HAL-4.1NoFusion Software
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* which is licensed under the Apache License, Version 2.0 as stated above.
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Product Disclaimer
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*
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* Common:
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*
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* Assessment of Products Returned from Field
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*
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* Returned products are considered good if they fulfill the specifications /
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* test data for 0-mileage and field listed in this document.
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*
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* Engineering Samples
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*
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* Engineering samples are marked with (e) or (E). Samples may vary from the
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* valid technical specifications of the series product contained in this
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* data sheet. Therefore, they are not intended or fit for resale to
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* third parties or for use in end products. Their sole purpose is internal
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* client testing. The testing of an engineering sample may in no way replace
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* the testing of a series product. Bosch assumes no liability for the use
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* of engineering samples. The purchaser shall indemnify Bosch from all claims
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* arising from the use of engineering samples.
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*
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* Intended use
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*
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* Provided that SMI130 is used within the conditions (environment, application,
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* installation, loads) as described in this TCD and the corresponding
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* agreed upon documents, Bosch ensures that the product complies with
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* the agreed properties. Agreements beyond this require
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* the written approval by Bosch. The product is considered fit for the intended
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* use when the product successfully has passed the tests
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* in accordance with the TCD and agreed upon documents.
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*
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* It is the responsibility of the customer to ensure the proper application
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* of the product in the overall system/vehicle.
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*
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* Bosch does not assume any responsibility for changes to the environment
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* of the product that deviate from the TCD and the agreed upon documents
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* as well as all applications not released by Bosch
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*
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* The resale and/or use of products are at the purchaser’s own risk and
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* responsibility. The examination and testing of the SMI130
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* is the sole responsibility of the purchaser.
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*
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* The purchaser shall indemnify Bosch from all third party claims
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* arising from any product use not covered by the parameters of
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* this product data sheet or not approved by Bosch and reimburse Bosch
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* for all costs and damages in connection with such claims.
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*
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* The purchaser must monitor the market for the purchased products,
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* particularly with regard to product safety, and inform Bosch without delay
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* of all security relevant incidents.
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*
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* Application Examples and Hints
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*
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* With respect to any application examples, advice, normal values
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* and/or any information regarding the application of the device,
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* Bosch hereby disclaims any and all warranties and liabilities of any kind,
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* including without limitation warranties of
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* non-infringement of intellectual property rights or copyrights
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* of any third party.
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* The information given in this document shall in no event be regarded
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* as a guarantee of conditions or characteristics. They are provided
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* for illustrative purposes only and no evaluation regarding infringement
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* of intellectual property rights or copyrights or regarding functionality,
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* performance or error has been made.
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*
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* @filename smi130_spi.c
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* @date 2014/11/25 14:40
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* @Modification Date 2018/08/28 18:20
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* @id "20f77db"
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* @version 1.3
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*
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* @brief
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* This file implements moudle function, which add
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* the driver to SPI core.
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*/
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/delay.h>
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#include "smi130_driver.h"
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/*! @defgroup smi130_spi_src
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* @brief smi130 spi driver module
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@{*/
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/*! the maximum of transfer buffer size */
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#define SMI_MAX_BUFFER_SIZE 32
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static struct spi_device *smi_spi_client;
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/*!
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* @brief define spi wirte function
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*
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* @param dev_addr sensor device address
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* @param reg_addr register address
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* @param data the pointer of data buffer
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* @param len block size need to write
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*
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* @return zero success, non-zero failed
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* @retval zero success
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* @retval non-zero failed
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*/
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static char smi_spi_write_block(u8 dev_addr, u8 reg_addr, u8 *data, u8 len)
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{
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struct spi_device *client = smi_spi_client;
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u8 buffer[SMI_MAX_BUFFER_SIZE + 1];
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struct spi_transfer xfer = {
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.tx_buf = buffer,
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.len = len + 1,
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};
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struct spi_message msg;
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if (len > SMI_MAX_BUFFER_SIZE)
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return -EINVAL;
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buffer[0] = reg_addr&0x7F;/* write: MSB = 0 */
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memcpy(&buffer[1], data, len);
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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return spi_sync(client, &msg);
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}
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/*!
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* @brief define spi read function
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*
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* @param dev_addr sensor device address
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* @param reg_addr register address
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* @param data the pointer of data buffer
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* @param len block size need to read
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*
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* @return zero success, non-zero failed
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* @retval zero success
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* @retval non-zero failed
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*/
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static char smi_spi_read_block(u8 dev_addr, u8 reg_addr, u8 *data, u8 len)
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{
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struct spi_device *client = smi_spi_client;
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u8 reg = reg_addr | 0x80;/* read: MSB = 1 */
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struct spi_transfer xfer[2] = {
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[0] = {
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.tx_buf = ®,
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.len = 1,
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},
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[1] = {
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.rx_buf = data,
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.len = len,
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}
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};
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struct spi_message msg;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer[0], &msg);
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spi_message_add_tail(&xfer[1], &msg);
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return spi_sync(client, &msg);
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}
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s8 smi_burst_read_wrapper(u8 dev_addr, u8 reg_addr, u8 *data, u16 len)
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{
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struct spi_device *client = smi_spi_client;
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u8 reg = reg_addr | 0x80;/* read: MSB = 1 */
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struct spi_transfer xfer[2] = {
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[0] = {
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.tx_buf = ®,
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.len = 1,
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},
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[1] = {
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.rx_buf = data,
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.len = len,
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}
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};
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struct spi_message msg;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer[0], &msg);
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spi_message_add_tail(&xfer[1], &msg);
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return spi_sync(client, &msg);
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}
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EXPORT_SYMBOL(smi_burst_read_wrapper);
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/*!
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* @brief SMI probe function via spi bus
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*
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* @param client the pointer of spi client
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*
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* @return zero success, non-zero failed
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* @retval zero success
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* @retval non-zero failed
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*/
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static int smi_spi_probe(struct spi_device *client)
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{
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int status;
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int err = 0;
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struct smi_client_data *client_data = NULL;
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if (NULL == smi_spi_client)
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smi_spi_client = client;
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else{
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dev_err(&client->dev, "This driver does not support multiple clients!\n");
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return -EBUSY;
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}
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client->bits_per_word = 8;
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status = spi_setup(client);
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if (status < 0) {
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dev_err(&client->dev, "spi_setup failed!\n");
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return status;
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}
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client_data = kzalloc(sizeof(struct smi_client_data), GFP_KERNEL);
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if (NULL == client_data) {
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dev_err(&client->dev, "no memory available");
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err = -ENOMEM;
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goto exit_err_clean;
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}
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client_data->device.bus_read = smi_spi_read_block;
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client_data->device.bus_write = smi_spi_write_block;
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return smi_probe(client_data, &client->dev);
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exit_err_clean:
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if (err)
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smi_spi_client = NULL;
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return err;
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}
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/*!
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* @brief shutdown smi device in spi driver
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*
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* @param client the pointer of spi client
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*
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* @return no return value
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*/
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static void smi_spi_shutdown(struct spi_device *client)
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{
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#ifdef CONFIG_PM
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smi_suspend(&client->dev);
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#endif
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}
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/*!
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* @brief remove smi spi client
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*
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* @param client the pointer of spi client
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*
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* @return zero
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* @retval zero
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*/
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static int smi_spi_remove(struct spi_device *client)
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{
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int err = 0;
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err = smi_remove(&client->dev);
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smi_spi_client = NULL;
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return err;
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}
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#ifdef CONFIG_PM
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/*!
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* @brief suspend smi device in spi driver
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*
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* @param dev the pointer of device
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*
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* @return zero
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* @retval zero
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*/
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static int smi_spi_suspend(struct device *dev)
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{
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int err = 0;
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err = smi_suspend(dev);
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return err;
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}
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/*!
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* @brief resume smi device in spi driver
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*
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* @param dev the pointer of device
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*
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* @return zero
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* @retval zero
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*/
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static int smi_spi_resume(struct device *dev)
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{
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int err = 0;
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/* post resume operation */
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err = smi_resume(dev);
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return err;
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}
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/*!
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* @brief register spi device power manager hooks
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*/
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static const struct dev_pm_ops smi_spi_pm_ops = {
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/**< device suspend */
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.suspend = smi_spi_suspend,
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/**< device resume */
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.resume = smi_spi_resume
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};
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#endif
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/*!
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* @brief register spi device id
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*/
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static const struct spi_device_id smi_id[] = {
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{ SENSOR_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, smi_id);
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/*!
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* @brief register spi driver hooks
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*/
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static struct spi_driver smi_spi_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = SENSOR_NAME,
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#ifdef CONFIG_PM
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.pm = &smi_spi_pm_ops,
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#endif
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},
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.id_table = smi_id,
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.probe = smi_spi_probe,
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.shutdown = smi_spi_shutdown,
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.remove = smi_spi_remove
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};
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/*!
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* @brief initialize smi spi module
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*
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* @return zero success, non-zero failed
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* @retval zero success
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* @retval non-zero failed
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*/
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static int __init smi_spi_init(void)
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{
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return spi_register_driver(&smi_spi_driver);
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}
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/*!
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* @brief remove smi spi module
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*
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* @return no return value
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*/
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static void __exit smi_spi_exit(void)
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{
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spi_unregister_driver(&smi_spi_driver);
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}
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MODULE_AUTHOR("Contact <contact@bosch-sensortec.com>");
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MODULE_DESCRIPTION("SMI130 SPI DRIVER");
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MODULE_LICENSE("GPL v2");
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module_init(smi_spi_init);
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module_exit(smi_spi_exit);
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/*@}*/
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