Date: Sat, 7 Apr 2018 18:09:31 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r332194 - head/sys/dev/spibus Message-ID: <201804071809.w37I9Vip015051@repo.freebsd.org>
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Author: ian Date: Sat Apr 7 18:09:31 2018 New Revision: 332194 URL: https://svnweb.freebsd.org/changeset/base/332194 Log: Add support for writing/changing spi device ivars. The SPI mode (polarity and phase) and the maximum bus speed can be changed. The chip select number cannot be changed, because the device instances which are children of spibus are inherently associated with the chip select number they were instantiated for. Modified: head/sys/dev/spibus/spibus.c Modified: head/sys/dev/spibus/spibus.c ============================================================================== --- head/sys/dev/spibus/spibus.c Sat Apr 7 18:08:42 2018 (r332193) +++ head/sys/dev/spibus/spibus.c Sat Apr 7 18:09:31 2018 (r332194) @@ -160,6 +160,37 @@ spibus_read_ivar(device_t bus, device_t child, int whi return (0); } +static int +spibus_write_ivar(device_t bus, device_t child, int which, uintptr_t value) +{ + struct spibus_ivar *devi = SPIBUS_IVAR(child); + + if (devi == NULL || device_get_parent(child) != bus) + return (EDOOFUS); + + switch (which) { + case SPIBUS_IVAR_CLOCK: + /* Any non-zero value is allowed for max clock frequency. */ + if (value == 0) + return (EINVAL); + devi->clock = (uint32_t)value; + break; + case SPIBUS_IVAR_CS: + /* Chip select cannot be changed. */ + return (EINVAL); + case SPIBUS_IVAR_MODE: + /* Valid SPI modes are 0-3. */ + if (value > 3) + return (EINVAL); + devi->mode = (uint32_t)value; + break; + default: + return (EINVAL); + } + + return (0); +} + static device_t spibus_add_child(device_t dev, u_int order, const char *name, int unit) { @@ -211,6 +242,7 @@ static device_method_t spibus_methods[] = { DEVMETHOD(bus_print_child, spibus_print_child), DEVMETHOD(bus_probe_nomatch, spibus_probe_nomatch), DEVMETHOD(bus_read_ivar, spibus_read_ivar), + DEVMETHOD(bus_write_ivar, spibus_write_ivar), DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str), DEVMETHOD(bus_child_location_str, spibus_child_location_str), DEVMETHOD(bus_hinted_child, spibus_hinted_child),
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