[PATCH v6] soc: qcom: Add SoC info driver

[Imran Khan <kimran@codeaurora.org>]

The SoC info driver provides information such as Chip ID,
Chip family, serial number and other such details about
Qualcomm SoCs.

Signed-off-by: Imran Khan <kimran@codeaurora.org>
---
v5 --> v6:
 - use dev_ext_attribute to represent SMEM image items
 - Avoid redundant function calls
 - Avoid use of unnecessary global variables
 - Remove redundant enums
 - Avoid redundant checking of socinfo being NULL or not
 - Avoid redundant checking of socinfo format version
 - Rename show/store function of attributes as _show/_store
   rather than _get/_set
 - Use an array to represent socinfo attributes and create
   attribute files in a loop depending on the minimum 
   socinfo format version for which these attributes are 
   supported
 - if obtained socinfo format version is greater than the
   maximum known version return an error rather than falling
   back to maximum known version
 
v4 --> v5:
 - Removed redundant function socinfo_print

v3 --> v4:
 - Corrected makefile so that smem and socinfo are treated as one module
 - Moved the code snippet to get socinfo smem item into socinfo.c
 - Removed redundant use of socinfo major version as it is always zero
 - Removed unused enums
 - Removed redundant indirections
 - Use image_version object to store information about each entry in the
   smem image table
 - Replaced usage of snprintf with sprintf and scnprintf
 - Get the address of image version table at the beginning and setup
   image version attributes only if image version table is available
 - Do the same for platform_subtype
 - Make different type of image version objects read only or readable/
   writable depending on their types. For example apps image attributes
   can be modified via sysfs but the same can't be done for modem image
 - Show PMIC model in a human readable form rather than a numeric number
 - Avoid using table in single sysfs entry
 - Removed checkpatch warnings about S_IRUGO

v2 --> v3:
 - Add support to toss soc information data into entropy pool
 - Since socinfo is rolled into smem driver, compile the
   relevant portion of socinfo driver with smem driver
 
v1 --> v2:
 - Removed inclusion of system_misc.h
 - merged socinfo.h into socinfo.c
 - made platform type and subtype arrays static
 - replaced uint32_t with u32
 - made functions static to avoid exposing vendor specific interface
 - Replaced usage of IS_ERR_OR_NULL with IS_ERR.
 - Remove raw-id attribute usage as human readable soc-id will suffice here
 - Avoid using a separate platform driver for socinfo by rolling it into smem driver itself.
   The sysfs setup is being done in a separate file (socinfo.c)
 - Replaced macro BUILD_ID_LENGTH with  SMEM_SOCINFO_BUILD_ID_LENGTH.
 - For failure cases where socinfo can not be read use a single dummy socinfo with error values.
 - Removed usage of early_machine_is_xxx.


 drivers/soc/qcom/Kconfig   |   1 +
 drivers/soc/qcom/Makefile  |   3 +-
 drivers/soc/qcom/smem.c    |   5 +
 drivers/soc/qcom/socinfo.c | 671 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 679 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/qcom/socinfo.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 461b387..f89d34d 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -24,6 +24,7 @@ config QCOM_SMEM
 	tristate "Qualcomm Shared Memory Manager (SMEM)"
 	depends on ARCH_QCOM
 	depends on HWSPINLOCK
+	select SOC_BUS
 	help
 	  Say y here to enable support for the Qualcomm Shared Memory Manager.
 	  The driver provides an interface to items in a heap shared among all
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index fdd664e..438efec 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -2,7 +2,8 @@ obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
 obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_QCOM_SMD) +=	smd.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
-obj-$(CONFIG_QCOM_SMEM) +=	smem.o
+obj-$(CONFIG_QCOM_SMEM) +=	qcom_smem.o
+qcom_smem-y := smem.o socinfo.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
 obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
 obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 18ec52f..c598cac 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -85,6 +85,9 @@
 /* Max number of processors/hosts in a system */
 #define SMEM_HOST_COUNT		9
 
+
+extern void qcom_socinfo_init(struct platform_device *pdev);
+
 /**
   * struct smem_proc_comm - proc_comm communication struct (legacy)
   * @command:	current command to be executed
@@ -751,6 +754,8 @@ static int qcom_smem_probe(struct platform_device *pdev)
 
 	__smem = smem;
 
+	qcom_socinfo_init(pdev);
+
 	return 0;
 }
 
diff --git a/drivers/soc/qcom/socinfo.c b/drivers/soc/qcom/socinfo.c
new file mode 100644
index 0000000..57e23dfc
--- /dev/null
+++ b/drivers/soc/qcom/socinfo.c
@@ -0,0 +1,671 @@
+/*
+ * Copyright (c) 2009-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/sys_soc.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/random.h>
+#include <linux/soc/qcom/smem.h>
+
+#define PMIC_MODEL_UNKNOWN		0
+#define HW_PLATFORM_QRD			11
+#define PLATFORM_SUBTYPE_QRD_INVALID	6
+#define PLATFORM_SUBTYPE_INVALID	4
+/*
+ * SOC version type with major number in the upper 16 bits and minor
+ * number in the lower 16 bits.  For example:
+ *   1.0 -> 0x00010000
+ *   2.3 -> 0x00020003
+ */
+#define SOC_VERSION_MAJOR(ver) (((ver) & 0xffff0000) >> 16)
+#define SOC_VERSION_MINOR(ver) ((ver) & 0x0000ffff)
+#define SOCINFO_VERSION_MAJOR	SOC_VERSION_MAJOR
+#define SOCINFO_VERSION_MINOR	SOC_VERSION_MINOR
+
+#define SMEM_SOCINFO_BUILD_ID_LENGTH		32
+#define SMEM_IMAGE_VERSION_BLOCKS_COUNT		32
+#define SMEM_IMAGE_VERSION_SIZE			4096
+#define SMEM_IMAGE_VERSION_NAME_SIZE		75
+#define SMEM_IMAGE_VERSION_VARIANT_SIZE		20
+#define SMEM_IMAGE_VERSION_OEM_SIZE		32
+#define SMEM_IMAGE_VERSION_PARTITION_APPS	10
+
+/*
+ * SMEM item ids, used to acquire handles to respective
+ * SMEM region.
+ */
+#define SMEM_IMAGE_VERSION_TABLE	469
+#define SMEM_HW_SW_BUILD_ID		137
+
+#define MAX_ATTR_COUNT	15
+
+/*
+ * SMEM Image table indices
+ */
+enum smem_image_table_index {
+	SMEM_IMAGE_TABLE_BOOT_INDEX = 0,
+	SMEM_IMAGE_TABLE_TZ_INDEX,
+	SMEM_IMAGE_TABLE_RPM_INDEX = 3,
+	SMEM_IMAGE_TABLE_APPS_INDEX = 10,
+	SMEM_IMAGE_TABLE_MPSS_INDEX,
+	SMEM_IMAGE_TABLE_ADSP_INDEX,
+	SMEM_IMAGE_TABLE_CNSS_INDEX,
+	SMEM_IMAGE_TABLE_VIDEO_INDEX
+};
+
+struct qcom_socinfo_attr {
+	struct device_attribute attr;
+	int min_version;
+};
+
+#define QCOM_SOCINFO_ATTR(_name, _show, _min_version) \
+	{ __ATTR(_name, 0444, _show, NULL), _min_version }
+
+#define SMEM_IMG_ATTR_ENTRY(_name, _mode, _show, _store, _index)	\
+	struct dev_ext_attribute dev_attr_##_name =			\
+	{ __ATTR(_name, _mode, _show, _store), (void *)_index }
+
+#define QCOM_SMEM_IMG_ITEM(_name, _mode, _index)			\
+	SMEM_IMG_ATTR_ENTRY(_name##_image_version, _mode,		\
+		qcom_show_image_version, qcom_store_image_version,	\
+		(unsigned long)_index);					\
+	SMEM_IMG_ATTR_ENTRY(_name##_image_variant, _mode,		\
+		qcom_show_image_variant, qcom_store_image_variant,	\
+		(unsigned long)_index);					\
+	SMEM_IMG_ATTR_ENTRY(_name##_image_crm, _mode,			\
+		qcom_show_image_crm, qcom_store_image_crm,		\
+		(unsigned long)_index);					\
+static struct attribute *_name##_image_attrs[] = {			\
+	&dev_attr_##_name##_image_version.attr.attr,			\
+	&dev_attr_##_name##_image_variant.attr.attr,			\
+	&dev_attr_##_name##_image_crm.attr.attr,			\
+	NULL,								\
+};									\
+static struct attribute_group _name##_image_attr_group = {		\
+	.attrs = _name##_image_attrs,					\
+}
+
+/* Hardware platform types */
+static const char *const hw_platform[] = {
+	[0] = "Unknown",
+	[1] = "Surf",
+	[2] = "FFA",
+	[3] = "Fluid",
+	[4] = "SVLTE_FFA",
+	[5] = "SLVTE_SURF",
+	[7] = "MDM_MTP_NO_DISPLAY",
+	[8] = "MTP",
+	[9] = "Liquid",
+	[10] = "Dragon",
+	[11] = "QRD",
+	[13] = "HRD",
+	[14] = "DTV",
+	[21] = "RCM",
+	[23] = "STP",
+	[24] = "SBC",
+};
+
+static const char *const qrd_hw_platform_subtype[] = {
+	[0] = "QRD",
+	[1] = "SKUAA",
+	[2] = "SKUF",
+	[3] = "SKUAB",
+	[5] = "SKUG",
+	[6] = "INVALID",
+};
+
+static const char *const hw_platform_subtype[] = {
+	"Unknown", "charm", "strange", "strange_2a", "Invalid",
+};
+
+static const char *const pmic_model[] = {
+	[0]  = "Unknown PMIC model",
+	[13] = "PMIC model: PM8058",
+	[14] = "PMIC model: PM8028",
+	[15] = "PMIC model: PM8901",
+	[16] = "PMIC model: PM8027",
+	[17] = "PMIC model: ISL9519",
+	[18] = "PMIC model: PM8921",
+	[19] = "PMIC model: PM8018",
+	[20] = "PMIC model: PM8015",
+	[21] = "PMIC model: PM8014",
+	[22] = "PMIC model: PM8821",
+	[23] = "PMIC model: PM8038",
+	[24] = "PMIC model: PM8922",
+	[25] = "PMIC model: PM8917",
+};
+
+struct smem_image_version {
+	char name[SMEM_IMAGE_VERSION_NAME_SIZE];
+	char variant[SMEM_IMAGE_VERSION_VARIANT_SIZE];
+	char pad;
+	char oem[SMEM_IMAGE_VERSION_OEM_SIZE];
+};
+
+/* Used to parse shared memory. Must match the modem. */
+struct socinfo_v0_1 {
+	u32 format;
+	u32 id;
+	u32 version;
+	char build_id[SMEM_SOCINFO_BUILD_ID_LENGTH];
+};
+
+struct socinfo_v0_2 {
+	struct socinfo_v0_1 v0_1;
+	u32 raw_version;
+};
+
+struct socinfo_v0_3 {
+	struct socinfo_v0_2 v0_2;
+	u32 hw_platform;
+};
+
+struct socinfo_v0_4 {
+	struct socinfo_v0_3 v0_3;
+	u32 platform_version;
+};
+
+struct socinfo_v0_5 {
+	struct socinfo_v0_4 v0_4;
+	u32 accessory_chip;
+};
+
+struct socinfo_v0_6 {
+	struct socinfo_v0_5 v0_5;
+	u32 hw_platform_subtype;
+};
+
+struct socinfo_v0_7 {
+	struct socinfo_v0_6 v0_6;
+	u32 pmic_model;
+	u32 pmic_die_revision;
+};
+
+struct socinfo_v0_8 {
+	struct socinfo_v0_7 v0_7;
+	u32 pmic_model_1;
+	u32 pmic_die_revision_1;
+	u32 pmic_model_2;
+	u32 pmic_die_revision_2;
+};
+
+struct socinfo_v0_9 {
+	struct socinfo_v0_8 v0_8;
+	u32 foundry_id;
+};
+
+struct socinfo_v0_10 {
+	struct socinfo_v0_9 v0_9;
+	u32 serial_number;
+};
+
+struct socinfo_v0_11 {
+	struct socinfo_v0_10 v0_10;
+	u32 num_pmics;
+	u32 pmic_array_offset;
+};
+
+struct socinfo_v0_12 {
+	struct socinfo_v0_11 v0_11;
+	u32 chip_family;
+	u32 raw_device_family;
+	u32 raw_device_number;
+};
+
+static union {
+	struct socinfo_v0_1 v0_1;
+	struct socinfo_v0_2 v0_2;
+	struct socinfo_v0_3 v0_3;
+	struct socinfo_v0_4 v0_4;
+	struct socinfo_v0_5 v0_5;
+	struct socinfo_v0_6 v0_6;
+	struct socinfo_v0_7 v0_7;
+	struct socinfo_v0_8 v0_8;
+	struct socinfo_v0_9 v0_9;
+	struct socinfo_v0_10 v0_10;
+	struct socinfo_v0_11 v0_11;
+	struct socinfo_v0_12 v0_12;
+} *socinfo;
+
+static struct smem_image_version *smem_image_version;
+static u32 socinfo_format;
+
+/* max socinfo format version supported */
+#define MAX_SOCINFO_FORMAT 12
+
+static const char *const cpu_of_id[] = {
+
+	[0] = "Unknown CPU",
+
+	/* 8x60 IDs */
+	[87] = "MSM8960",
+
+	/* 8x64 IDs */
+	[109] = "APQ8064",
+	[130] = "MPQ8064",
+
+	/* 8x60A IDs */
+	[122] = "MSM8660A",
+	[123] = "MSM8260A",
+	[124] = "APQ8060A",
+
+	/* 8x74 IDs */
+	[126] = "MSM8974",
+	[184] = "APQ8074",
+	[185] = "MSM8274",
+	[186] = "MSM8674",
+
+	/* 8x74AA IDs */
+	[208] = "APQ8074-AA",
+	[211] = "MSM8274-AA",
+	[214] = "MSM8674-AA",
+	[217] = "MSM8974-AA",
+
+	/* 8x74AB IDs */
+	[209] = "APQ8074-AB",
+	[212] = "MSM8274-AB",
+	[215] = "MSM8674-AB",
+	[218] = "MSM8974-AB",
+
+	/* 8x74AC IDs */
+	[194] = "MSM8974PRO",
+	[210] = "APQ8074PRO",
+	[213] = "MSM8274PRO",
+	[216] = "MSM8674PRO",
+
+	/* 8x60AB IDs */
+	[138] = "MSM8960AB",
+	[139] = "APQ8060AB",
+	[140] = "MSM8260AB",
+	[141] = "MSM8660AB",
+
+	/* 8x84 IDs */
+	[178] = "APQ8084",
+
+	/* 8x16 IDs */
+	[206] = "MSM8916",
+	[247] = "APQ8016",
+	[248] = "MSM8216",
+	[249] = "MSM8116",
+	[250] = "MSM8616",
+
+	/* 8x96 IDs */
+	[246] = "MSM8996",
+	[310] = "MSM8996AU",
+	[311] = "APQ8096AU",
+	[291] = "APQ8096",
+	[305] = "MSM8996SG",
+	[312] = "APQ8096SG",
+
+	/*
+	 * Uninitialized IDs are not known to run Linux.
+	 * MSM_CPU_UNKNOWN is set to 0 to ensure these IDs are
+	 * considered as unknown CPU.
+	 */
+};
+
+/* socinfo: sysfs functions */
+
+static ssize_t
+qcom_show_vendor(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	return sprintf(buf, "%s", "Qualcomm\n");
+}
+
+static ssize_t
+qcom_show_raw_version(struct device *dev,
+		     struct device_attribute *attr,
+		     char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_2.raw_version);
+}
+
+static ssize_t
+qcom_show_build_id(struct device *dev,
+		   struct device_attribute *attr,
+		   char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%s\n", socinfo->v0_1.build_id);
+}
+
+static ssize_t
+qcom_show_hw_platform(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%s\n", hw_platform[socinfo->v0_3.hw_platform]);
+}
+
+static ssize_t
+qcom_show_platform_version(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_4.platform_version);
+}
+
+static ssize_t
+qcom_show_accessory_chip(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_5.accessory_chip);
+}
+
+static ssize_t
+qcom_show_platform_subtype(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	u32 hw_subtype = socinfo->v0_6.hw_platform_subtype;
+
+	if (socinfo->v0_3.hw_platform == HW_PLATFORM_QRD)
+		if (hw_subtype >= 0 &&
+				hw_subtype < PLATFORM_SUBTYPE_QRD_INVALID)
+			return sprintf(buf, "%s\n",
+				qrd_hw_platform_subtype[hw_subtype]);
+		else
+			return -EINVAL;
+	else
+		if (hw_subtype >= 0 &&
+				hw_subtype < PLATFORM_SUBTYPE_INVALID)
+			return sprintf(buf, "%s\n",
+				hw_platform_subtype[hw_subtype]);
+		else
+			return -EINVAL;
+}
+
+static ssize_t
+qcom_show_platform_subtype_id(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_6.hw_platform_subtype);
+}
+
+static ssize_t
+qcom_show_foundry_id(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_9.foundry_id);
+}
+
+static ssize_t
+qcom_show_serial_number(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_10.serial_number);
+}
+
+static ssize_t
+qcom_show_chip_family(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "0x%x\n", socinfo->v0_12.chip_family);
+}
+
+static ssize_t
+qcom_show_raw_device_family(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "0x%x\n", socinfo->v0_12.raw_device_family);
+}
+
+static ssize_t
+qcom_show_raw_device_number(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "0x%x\n", socinfo->v0_12.raw_device_number);
+}
+
+static ssize_t
+qcom_show_pmic_model(struct device *dev,
+			struct device_attribute *attr,
+			char *buf)
+{
+	return sprintf(buf, "%s\n", pmic_model[socinfo->v0_7.pmic_model]);
+}
+
+static ssize_t
+qcom_show_pmic_die_revision(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	return sprintf(buf, "%u\n", socinfo->v0_7.pmic_die_revision);
+}
+
+static ssize_t
+qcom_show_image_version(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return scnprintf(buf, PAGE_SIZE, "%s\n",
+			smem_image_version[index].name);
+}
+
+static ssize_t
+qcom_store_image_version(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return strlcpy(smem_image_version[index].name, buf,
+			SMEM_IMAGE_VERSION_NAME_SIZE);
+}
+
+static ssize_t
+qcom_show_image_variant(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return scnprintf(buf, PAGE_SIZE, "%s\n",
+			smem_image_version[index].variant);
+}
+
+static ssize_t
+qcom_store_image_variant(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return strlcpy(smem_image_version[index].variant, buf,
+			SMEM_IMAGE_VERSION_VARIANT_SIZE);
+}
+
+static ssize_t
+qcom_show_image_crm(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return scnprintf(buf, PAGE_SIZE, "%s\n",
+			smem_image_version[index].oem);
+}
+
+static ssize_t
+qcom_store_image_crm(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf, size_t size)
+{
+	struct dev_ext_attribute *dev_attr;
+	int index;
+
+	dev_attr = container_of(attr, struct dev_ext_attribute, attr);
+	index = (unsigned long)(dev_attr->var);
+	return strlcpy(smem_image_version[index].oem, buf,
+			SMEM_IMAGE_VERSION_OEM_SIZE);
+}
+
+static const struct qcom_socinfo_attr qcom_socinfo_attrs[] = {
+	QCOM_SOCINFO_ATTR(chip_family, qcom_show_chip_family, 12),
+	QCOM_SOCINFO_ATTR(raw_device_family, qcom_show_raw_device_family, 12),
+	QCOM_SOCINFO_ATTR(raw_device_number, qcom_show_raw_device_number, 12),
+	QCOM_SOCINFO_ATTR(serial_number, qcom_show_serial_number, 10),
+	QCOM_SOCINFO_ATTR(foundry_id, qcom_show_foundry_id, 9),
+	QCOM_SOCINFO_ATTR(pmic_model, qcom_show_pmic_model, 7),
+	QCOM_SOCINFO_ATTR(pmic_die_revision, qcom_show_pmic_die_revision, 7),
+	QCOM_SOCINFO_ATTR(platform_subtype, qcom_show_platform_subtype, 6),
+	QCOM_SOCINFO_ATTR(platform_subtype_id,
+				qcom_show_platform_subtype_id, 6),
+	QCOM_SOCINFO_ATTR(accessory_chip, qcom_show_accessory_chip, 5),
+	QCOM_SOCINFO_ATTR(platform_version, qcom_show_platform_version, 4),
+	QCOM_SOCINFO_ATTR(hw_platform, qcom_show_hw_platform, 3),
+	QCOM_SOCINFO_ATTR(raw_version, qcom_show_raw_version, 2),
+	QCOM_SOCINFO_ATTR(build_id, qcom_show_build_id, 1),
+	QCOM_SOCINFO_ATTR(vendor, qcom_show_vendor, 0),
+};
+
+QCOM_SMEM_IMG_ITEM(boot, 0444, SMEM_IMAGE_TABLE_BOOT_INDEX);
+QCOM_SMEM_IMG_ITEM(tz, 0444, SMEM_IMAGE_TABLE_TZ_INDEX);
+QCOM_SMEM_IMG_ITEM(rpm, 0444, SMEM_IMAGE_TABLE_RPM_INDEX);
+QCOM_SMEM_IMG_ITEM(apps, 0644, SMEM_IMAGE_TABLE_APPS_INDEX);
+QCOM_SMEM_IMG_ITEM(mpss, 0444, SMEM_IMAGE_TABLE_MPSS_INDEX);
+QCOM_SMEM_IMG_ITEM(adsp, 0444, SMEM_IMAGE_TABLE_ADSP_INDEX);
+QCOM_SMEM_IMG_ITEM(cnss, 0444, SMEM_IMAGE_TABLE_CNSS_INDEX);
+QCOM_SMEM_IMG_ITEM(video, 0444, SMEM_IMAGE_TABLE_VIDEO_INDEX);
+
+static struct attribute_group
+	*smem_image_table[SMEM_IMAGE_VERSION_BLOCKS_COUNT] = {
+		[SMEM_IMAGE_TABLE_BOOT_INDEX] = &boot_image_attr_group,
+		[SMEM_IMAGE_TABLE_TZ_INDEX] = &tz_image_attr_group,
+		[SMEM_IMAGE_TABLE_RPM_INDEX] = &rpm_image_attr_group,
+		[SMEM_IMAGE_TABLE_APPS_INDEX] = &apps_image_attr_group,
+		[SMEM_IMAGE_TABLE_MPSS_INDEX] = &mpss_image_attr_group,
+		[SMEM_IMAGE_TABLE_ADSP_INDEX] = &adsp_image_attr_group,
+		[SMEM_IMAGE_TABLE_CNSS_INDEX] = &cnss_image_attr_group,
+		[SMEM_IMAGE_TABLE_VIDEO_INDEX] = &video_image_attr_group,
+};
+
+static void socinfo_populate_sysfs_files(struct device *dev)
+{
+	int idx;
+	int err;
+
+	/*
+	 * Expose SMEM_IMAGE_TABLE to sysfs only when we have IMAGE_TABLE
+	 * available in SMEM. As IMAGE_TABLE and SOCINFO are two separate
+	 * items within SMEM, we expose the remaining soc information(i.e
+	 * only the SOCINFO item available in SMEM) to sysfs even in the
+	 * absence of an IMAGE_TABLE.
+	 */
+	if (smem_image_version)
+		for (idx = 0; idx < SMEM_IMAGE_VERSION_BLOCKS_COUNT; idx++)
+			if (smem_image_table[idx])
+				err = sysfs_create_group(&dev->kobj,
+					smem_image_table[idx]);
+
+	for (idx = 0; idx < MAX_ATTR_COUNT; idx++)
+		if (qcom_socinfo_attrs[idx].min_version <= socinfo_format)
+			device_create_file(dev, &qcom_socinfo_attrs[idx].attr);
+}
+
+void qcom_socinfo_init(struct platform_device *pdev)
+{
+	struct soc_device_attribute *attr;
+	struct device *qcom_soc_device;
+	struct soc_device *soc_dev;
+	size_t img_tbl_size;
+	u32 soc_version;
+	size_t size;
+
+	socinfo = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID,
+			&size);
+	if (IS_ERR(socinfo)) {
+		dev_err(&pdev->dev, "Coudn't find socinfo.\n");
+		return;
+	}
+
+	if ((SOCINFO_VERSION_MAJOR(socinfo->v0_1.format) != 0) ||
+			(SOCINFO_VERSION_MINOR(socinfo->v0_1.format) < 0) ||
+			(socinfo->v0_1.format > MAX_SOCINFO_FORMAT)) {
+		dev_err(&pdev->dev, "Wrong socinfo format\n");
+		return;
+	}
+	socinfo_format = socinfo->v0_1.format;
+
+	if (!socinfo->v0_1.id)
+		dev_err(&pdev->dev, "socinfo: Unknown SoC ID!\n");
+
+	WARN(socinfo->v0_1.id >= ARRAY_SIZE(cpu_of_id),
+		"New IDs added! ID => CPU mapping needs an update.\n");
+
+	smem_image_version = qcom_smem_get(QCOM_SMEM_HOST_ANY,
+				SMEM_IMAGE_VERSION_TABLE,
+				&img_tbl_size);
+	if (IS_ERR(smem_image_version) ||
+		(img_tbl_size != SMEM_IMAGE_VERSION_SIZE)) {
+		dev_warn(&pdev->dev, "Image version table absent.\n");
+		smem_image_version = NULL;
+	}
+
+	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+	if (!attr) {
+		dev_err(&pdev->dev, "Unable to allocate attributes.\n");
+		return;
+	}
+	soc_version = socinfo->v0_1.version;
+
+	attr->soc_id = kasprintf(GFP_KERNEL, "%d", socinfo->v0_1.id);
+	attr->family = "Snapdragon";
+	attr->machine = cpu_of_id[socinfo->v0_1.id];
+	attr->revision = kasprintf(GFP_KERNEL, "%u.%u",
+				SOC_VERSION_MAJOR(soc_version),
+				SOC_VERSION_MINOR(soc_version));
+
+	soc_dev = soc_device_register(attr);
+	if (IS_ERR(soc_dev)) {
+		kfree(attr);
+		return;
+	}
+
+	qcom_soc_device = soc_device_to_device(soc_dev);
+	socinfo_populate_sysfs_files(qcom_soc_device);
+
+	/* Feed the soc specific unique data into entropy pool */
+	add_device_randomness(socinfo, size);
+}
+EXPORT_SYMBOL(qcom_socinfo_init);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project