Merge "sensors: add support to load SLPI images in SSC driver" (b3e82f4f) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/sensors/sensors_ssc.c

+190 −2

Original line number	Original line	Diff line number	Diff line
	/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.		/* Copyright (c) 2012-2015, The Linux Foundation. All rights reserved.
	*		*
	* This program is free software; you can redistribute it and/or modify		* 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		* it under the terms of the GNU General Public License version 2 and
	@@ -22,6 +22,14 @@
	#include <asm/arch_timer.h>		#include <asm/arch_timer.h>
	#include <linux/uaccess.h>		#include <linux/uaccess.h>

			#include <linux/kernel.h>
			#include <linux/err.h>
			#include <linux/delay.h>
			#include <linux/sysfs.h>
			#include <soc/qcom/subsystem_restart.h>

			#define IMAGE_LOAD_CMD 1
			#define IMAGE_UNLOAD_CMD 0
	#define CLASS_NAME "ssc"		#define CLASS_NAME "ssc"
	#define DRV_NAME "sensors"		#define DRV_NAME "sensors"
	#define DRV_VERSION "2.00"		#define DRV_VERSION "2.00"
	@@ -37,6 +45,180 @@ struct sns_ssc_control_s {
	};		};
	static struct sns_ssc_control_s sns_ctl;		static struct sns_ssc_control_s sns_ctl;

			static ssize_t slpi_boot_store(struct kobject *kobj,
			struct kobj_attribute *attr,
			const char *buf, size_t count);

			struct slpi_loader_private {
			void *pil_h;
			struct kobject *boot_slpi_obj;
			struct attribute_group *attr_group;
			};

			static struct kobj_attribute slpi_boot_attribute =
			__ATTR(boot, 0220, NULL, slpi_boot_store);

			static struct attribute *attrs[] = {
			&slpi_boot_attribute.attr,
			NULL,
			};

			static struct platform_device *slpi_private;

			static void slpi_loader_do(struct platform_device *pdev)
			{

			struct slpi_loader_private *priv = NULL;

			if (!pdev) {
			dev_err(&pdev->dev, "%s: Platform device null\n", __func__);
			goto fail;
			}

			if (!pdev->dev.of_node) {
			dev_err(&pdev->dev,
			"%s: Device tree information missing\n", __func__);
			goto fail;
			}

			priv = platform_get_drvdata(pdev);
			if (!priv) {
			dev_err(&pdev->dev,
			" %s: Private data get failed\n", __func__);
			goto fail;
			}

			priv->pil_h = subsystem_get("slpi");
			if (IS_ERR(priv->pil_h)) {
			dev_err(&pdev->dev, "%s: pil get failed,\n",
			__func__);
			goto fail;
			}

			dev_err(&pdev->dev, "%s: SLPI image is loaded\n", __func__);
			return;

			fail:
			dev_err(&pdev->dev, "%s: SLPI image loading failed\n", __func__);
			}

			static void slpi_loader_unload(struct platform_device *pdev)
			{
			struct slpi_loader_private *priv = NULL;

			priv = platform_get_drvdata(pdev);

			if (!priv)
			return;

			if (priv->pil_h) {
			dev_dbg(&pdev->dev, "%s: calling subsystem put\n", __func__);
			subsystem_put(priv->pil_h);
			priv->pil_h = NULL;
			}
			}

			static ssize_t slpi_boot_store(struct kobject *kobj,
			struct kobj_attribute *attr,
			const char *buf,
			size_t count)
			{
			int boot = 0;

			if (sscanf(buf, "%du", &boot) != 1)
			return -EINVAL;

			if (boot == IMAGE_LOAD_CMD) {
			pr_debug("%s: going to call slpi_loader_do\n", __func__);
			slpi_loader_do(slpi_private);
			} else if (boot == IMAGE_UNLOAD_CMD) {
			pr_debug("%s: going to call slpi_unloader\n", __func__);
			slpi_loader_unload(slpi_private);
			}
			return count;
			}

			static int slpi_loader_init_sysfs(struct platform_device *pdev)
			{
			int ret = -EINVAL;
			struct slpi_loader_private *priv = NULL;

			slpi_private = NULL;

			priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
			if (!priv) {
			ret = -ENOMEM;
			return ret;
			}

			platform_set_drvdata(pdev, priv);

			priv->pil_h = NULL;
			priv->boot_slpi_obj = NULL;
			priv->attr_group = devm_kzalloc(&pdev->dev,
			sizeof(*(priv->attr_group)),
			GFP_KERNEL);
			if (!priv->attr_group) {
			dev_err(&pdev->dev, "%s: malloc attr_group failed\n",
			__func__);
			ret = -ENOMEM;
			goto error_return;
			}

			priv->attr_group->attrs = attrs;

			priv->boot_slpi_obj = kobject_create_and_add("boot_slpi", kernel_kobj);
			if (!priv->boot_slpi_obj) {
			dev_err(&pdev->dev, "%s: sysfs create and add failed\n",
			__func__);
			ret = -ENOMEM;
			goto error_return;
			}

			ret = sysfs_create_group(priv->boot_slpi_obj, priv->attr_group);
			if (ret) {
			dev_err(&pdev->dev, "%s: sysfs create group failed %d\n",
			__func__, ret);
			goto error_return;
			}

			slpi_private = pdev;

			return 0;

			error_return:

			if (priv->boot_slpi_obj) {
			kobject_del(priv->boot_slpi_obj);
			priv->boot_slpi_obj = NULL;
			}

			return ret;
			}

			static int slpi_loader_remove(struct platform_device *pdev)
			{
			struct slpi_loader_private *priv = NULL;

			priv = platform_get_drvdata(pdev);

			if (!priv)
			return 0;

			if (priv->pil_h) {
			subsystem_put(priv->pil_h);
			priv->pil_h = NULL;
			}

			if (priv->boot_slpi_obj) {
			sysfs_remove_group(priv->boot_slpi_obj, priv->attr_group);
			kobject_del(priv->boot_slpi_obj);
			priv->boot_slpi_obj = NULL;
			}

			return 0;
			}

	/*		/*
	* Read QTimer clock ticks and scale down to 32KHz clock as used		* Read QTimer clock ticks and scale down to 32KHz clock as used
	* in DSPS		* in DSPS
	@@ -104,7 +286,12 @@ const struct file_operations sensors_ssc_fops = {

	static int sensors_ssc_probe(struct platform_device *pdev)		static int sensors_ssc_probe(struct platform_device *pdev)
	{		{
	int ret = 0;		int ret = slpi_loader_init_sysfs(pdev);

			if (ret != 0) {
			dev_err(&pdev->dev, "%s: Error in initing sysfs\n", __func__);
			return ret;
			}

	sns_ctl.dev_class = class_create(THIS_MODULE, CLASS_NAME);		sns_ctl.dev_class = class_create(THIS_MODULE, CLASS_NAME);
	if (sns_ctl.dev_class == NULL) {		if (sns_ctl.dev_class == NULL) {
	@@ -156,6 +343,7 @@ res_err:

	static int sensors_ssc_remove(struct platform_device *pdev)		static int sensors_ssc_remove(struct platform_device *pdev)
	{		{
			slpi_loader_remove(pdev);
	cdev_del(sns_ctl.cdev);		cdev_del(sns_ctl.cdev);
	kfree(sns_ctl.cdev);		kfree(sns_ctl.cdev);
	sns_ctl.cdev = NULL;		sns_ctl.cdev = NULL;