ARM: OMAP2+: Export SoC information to userspace
In some situations it is useful for userspace to
know some SoC-specific information. For example,
this may be used for deciding what kernel module to
use or how to better configure some settings etc.
This patch exports OMAP SoC information to userspace
using existing in Linux kernel SoC infrastructure.
This information can be read under
/sys/devices/socX directory
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>
[tony@atomide.com: updated for multiplatform changes]
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 3737700..098e94e 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -18,6 +18,11 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
+#include <linux/slab.h>
+
+#ifdef CONFIG_SOC_BUS
+#include <linux/sys_soc.h>
+#endif
#include <asm/cputype.h>
@@ -583,3 +588,63 @@
else
tap_prod_id = 0x0208;
}
+
+#ifdef CONFIG_SOC_BUS
+
+static const char const *omap_types[] = {
+ [OMAP2_DEVICE_TYPE_TEST] = "TST",
+ [OMAP2_DEVICE_TYPE_EMU] = "EMU",
+ [OMAP2_DEVICE_TYPE_SEC] = "HS",
+ [OMAP2_DEVICE_TYPE_GP] = "GP",
+ [OMAP2_DEVICE_TYPE_BAD] = "BAD",
+};
+
+static const char * __init omap_get_family(void)
+{
+ if (cpu_is_omap24xx())
+ return kasprintf(GFP_KERNEL, "OMAP2");
+ else if (cpu_is_omap34xx())
+ return kasprintf(GFP_KERNEL, "OMAP3");
+ else if (cpu_is_omap44xx())
+ return kasprintf(GFP_KERNEL, "OMAP4");
+ else if (soc_is_omap54xx())
+ return kasprintf(GFP_KERNEL, "OMAP5");
+ else
+ return kasprintf(GFP_KERNEL, "Unknown");
+}
+
+static ssize_t omap_get_type(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%s\n", omap_types[omap_type()]);
+}
+
+static struct device_attribute omap_soc_attr =
+ __ATTR(type, S_IRUGO, omap_get_type, NULL);
+
+void __init omap_soc_device_init(void)
+{
+ struct device *parent;
+ struct soc_device *soc_dev;
+ struct soc_device_attribute *soc_dev_attr;
+
+ soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+ if (!soc_dev_attr)
+ return;
+
+ soc_dev_attr->machine = soc_name;
+ soc_dev_attr->family = omap_get_family();
+ soc_dev_attr->revision = soc_rev;
+
+ soc_dev = soc_device_register(soc_dev_attr);
+ if (IS_ERR_OR_NULL(soc_dev)) {
+ kfree(soc_dev_attr);
+ return;
+ }
+
+ parent = soc_device_to_device(soc_dev);
+ if (!IS_ERR_OR_NULL(parent))
+ device_create_file(parent, &omap_soc_attr);
+}
+#endif /* CONFIG_SOC_BUS */