3c08673438
These feature are required for an upcoming Apple MacBook topcase (HID over SPI) driver: A delay after toggling CS is required to avoid anomalies like an extra junk byte in front of the message. Keeping CS asserted is required to be able to read a status report after writing a command. (The device won't return the status if CS was deasserted.) Sleep is not allowed in the interrupt context where the Apple input driver runs its transactions. Use a flag to tell the SPI driver to avoid mtx_sleep. Reviewed by: manu (ok to SPI part of larger patch) MFC afret: 1 month Differential revision: https://reviews.freebsd.org/D29534
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct spi_command {
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void *tx_cmd;
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uint32_t tx_cmd_sz;
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void *rx_cmd;
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uint32_t rx_cmd_sz;
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void *tx_data;
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uint32_t tx_data_sz;
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void *rx_data;
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uint32_t rx_data_sz;
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uint32_t flags;
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};
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#define SPI_COMMAND_INITIALIZER { 0 }
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#define SPI_FLAG_KEEP_CS 0x1 /* Keep chip select asserted */
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#define SPI_FLAG_NO_SLEEP 0x2 /* Prevent driver from sleeping (use polling) */
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#define SPI_CHIP_SELECT_HIGH 0x1 /* Chip select high (else low) */
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#ifdef FDT
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#define SPIBUS_FDT_PNP_INFO(t) FDTCOMPAT_PNP_INFO(t, spibus)
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#else
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#define SPIBUS_FDT_PNP_INFO(t)
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#endif
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