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spicmds: Rework spi config commands

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Rework the spi_config commands so that bus configuration and shutdown
message configuration is done separately from the main "config_spi"
command.  This makes the spi configuration more flexible.  It's now
possible to use software spi without a CS pin.  It's now possible to
define multiple SPI messages to send on a shutdown event.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-08-06 11:44:29 -04:00
parent 30bd7c0e47
commit c2a08962b7
9 changed files with 115 additions and 116 deletions
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121
src/spicmds.c
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@@ -1,6 +1,6 @@
// Commands for sending messages on an SPI bus
//
// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2016-2019 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@@ -20,69 +20,27 @@ struct spidev_s {
};
struct gpio_out pin;
uint8_t flags;
uint8_t shutdown_msg_len;
uint8_t shutdown_msg[];
};
enum {
SF_HAVE_PIN = 1, SF_SOFTWARE = 2,
SF_HAVE_PIN = 1, SF_SOFTWARE = 2, SF_HARDWARE = 4,
};
void
command_config_spi(uint32_t *args)
{
uint8_t mode = args[3], shutdown_msg_len = args[5];
if (mode > 3)
shutdown("Invalid spi mode");
struct spidev_s *spi = oid_alloc(args[0], command_config_spi
, sizeof(*spi) + shutdown_msg_len);
spi->pin = gpio_out_setup(args[2], 1);
spi->flags = SF_HAVE_PIN;
spi->spi_config = spi_setup(args[1], mode, args[4]);
spi->shutdown_msg_len = shutdown_msg_len;
uint8_t *shutdown_msg = (void*)(size_t)args[6];
memcpy(spi->shutdown_msg, shutdown_msg, shutdown_msg_len);
struct spidev_s *spi = oid_alloc(args[0], command_config_spi, sizeof(*spi));
spi->pin = gpio_out_setup(args[1], 1);
spi->flags |= SF_HAVE_PIN;
}
DECL_COMMAND(command_config_spi,
"config_spi oid=%c spi_bus=%u pin=%u mode=%u rate=%u"
" shutdown_msg=%*s");
DECL_COMMAND(command_config_spi, "config_spi oid=%c pin=%u");
void
command_config_spi_without_cs(uint32_t *args)
{
uint8_t mode = args[2], shutdown_msg_len = args[4];
if (mode > 3)
shutdown("Invalid spi mode");
struct spidev_s *spi = oid_alloc(args[0], command_config_spi
, sizeof(*spi) + shutdown_msg_len);
spi->spi_config = spi_setup(args[1], mode, args[3]);
spi->shutdown_msg_len = shutdown_msg_len;
uint8_t *shutdown_msg = (void*)(size_t)args[5];
memcpy(spi->shutdown_msg, shutdown_msg, shutdown_msg_len);
struct spidev_s *spi = oid_alloc(args[0], command_config_spi, sizeof(*spi));
}
DECL_COMMAND(command_config_spi_without_cs,
"config_spi_without_cs oid=%c spi_bus=%u mode=%u rate=%u"
" shutdown_msg=%*s");
void
command_config_spi_from_software(uint32_t *args)
{
uint8_t shutdown_msg_len = args[3];
struct spi_software *sspi = spi_software_oid_lookup(args[1]);
struct spidev_s *spi = oid_alloc(args[0], command_config_spi
, sizeof(*spi) + shutdown_msg_len);
spi->pin = gpio_out_setup(args[2], 1);
spi->flags = SF_HAVE_PIN | SF_SOFTWARE;
spi->spi_software = sspi;
spi->shutdown_msg_len = shutdown_msg_len;
uint8_t *shutdown_msg = (void*)(size_t)args[4];
memcpy(spi->shutdown_msg, shutdown_msg, shutdown_msg_len);
}
#if CONFIG_HAVE_GPIO_BITBANGING
DECL_COMMAND(command_config_spi_from_software,
"config_spi_from_software oid=%c sw_oid=%u pin=%u"
" shutdown_msg=%*s");
#endif
DECL_COMMAND(command_config_spi_without_cs, "config_spi_without_cs oid=%c");
struct spidev_s *
spidev_oid_lookup(uint8_t oid)
@@ -90,10 +48,36 @@ spidev_oid_lookup(uint8_t oid)
return oid_lookup(oid, command_config_spi);
}
void
command_spi_set_bus(uint32_t *args)
{
struct spidev_s *spi = spidev_oid_lookup(args[0]);
uint8_t mode = args[2];
if (mode > 3 || spi->flags & (SF_SOFTWARE|SF_HARDWARE))
shutdown("Invalid spi config");
spi->spi_config = spi_setup(args[1], mode, args[3]);
spi->flags |= SF_HARDWARE;
}
DECL_COMMAND(command_spi_set_bus,
"spi_set_bus oid=%c spi_bus=%u mode=%u rate=%u");
void
spidev_set_software_bus(struct spidev_s *spi, struct spi_software *ss)
{
if (spi->flags & (SF_SOFTWARE|SF_HARDWARE))
shutdown("Invalid spi config");
spi->spi_software = ss;
spi->flags |= SF_SOFTWARE;
}
void
spidev_transfer(struct spidev_s *spi, uint8_t receive_data
, uint8_t data_len, uint8_t *data)
{
if (!(spi->flags & (SF_SOFTWARE|SF_HARDWARE)))
// Not yet initialized
return;
if (CONFIG_HAVE_GPIO_BITBANGING && spi->flags & SF_SOFTWARE)
spi_software_prepare(spi->spi_software);
else
@@ -115,7 +99,7 @@ void
command_spi_transfer(uint32_t *args)
{
uint8_t oid = args[0];
struct spidev_s *spi = oid_lookup(oid, command_config_spi);
struct spidev_s *spi = spidev_oid_lookup(oid);
uint8_t data_len = args[1];
uint8_t *data = (void*)(size_t)args[2];
spidev_transfer(spi, 1, data_len, data);
@@ -126,14 +110,39 @@ DECL_COMMAND(command_spi_transfer, "spi_transfer oid=%c data=%*s");
void
command_spi_send(uint32_t *args)
{
uint8_t oid = args[0];
struct spidev_s *spi = oid_lookup(oid, command_config_spi);
struct spidev_s *spi = spidev_oid_lookup(args[0]);
uint8_t data_len = args[1];
uint8_t *data = (void*)(size_t)args[2];
spidev_transfer(spi, 0, data_len, data);
}
DECL_COMMAND(command_spi_send, "spi_send oid=%c data=%*s");
/****************************************************************
* Shutdown handling
****************************************************************/
struct spidev_shutdown_s {
struct spidev_s *spi;
uint8_t shutdown_msg_len;
uint8_t shutdown_msg[];
};
void
command_config_spi_shutdown(uint32_t *args)
{
struct spidev_s *spi = spidev_oid_lookup(args[1]);
uint8_t shutdown_msg_len = args[2];
struct spidev_shutdown_s *sd = oid_alloc(
args[0], command_config_spi_shutdown, sizeof(*sd) + shutdown_msg_len);
sd->spi = spi;
sd->shutdown_msg_len = shutdown_msg_len;
uint8_t *shutdown_msg = (void*)(size_t)args[3];
memcpy(sd->shutdown_msg, shutdown_msg, shutdown_msg_len);
}
DECL_COMMAND(command_config_spi_shutdown,
"config_spi_shutdown oid=%c spi_oid=%c shutdown_msg=%*s");
void
spidev_shutdown(void)
{
@@ -146,9 +155,9 @@ spidev_shutdown(void)
}
// Send shutdown messages
foreach_oid(oid, spi, command_config_spi) {
if (spi->shutdown_msg_len)
spidev_transfer(spi, 0, spi->shutdown_msg_len, spi->shutdown_msg);
struct spidev_shutdown_s *sd;
foreach_oid(oid, sd, command_config_spi_shutdown) {
spidev_transfer(sd->spi, 0, sd->shutdown_msg_len, sd->shutdown_msg);
}
}
DECL_SHUTDOWN(spidev_shutdown);