drivers/sensors/sensors_ssc.c - kernel/msm-4.9 - Gitiles

 /* Copyright (c) 2012-2017, 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/types.h>
 #include <linux/msm_dsps.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
 #include <linux/cdev.h>
 #include <linux/fs.h>
 #include <linux/of_device.h>
 #include <asm/arch_timer.h>
 #include <linux/uaccess.h>

 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/delay.h>
 #include <linux/sysfs.h>
 #include <linux/workqueue.h>

 #include <soc/qcom/subsystem_restart.h>

 #define IMAGE_LOAD_CMD 1
 #define IMAGE_UNLOAD_CMD 0
 #define SSR_RESET_CMD 1
 #define CLASS_NAME	"ssc"
 #define DRV_NAME	"sensors"
 #define DRV_VERSION	"2.00"
 #ifdef CONFIG_COMPAT
 #define DSPS_IOCTL_READ_SLOW_TIMER32	_IOR(DSPS_IOCTL_MAGIC, 3, compat_uint_t)
 #endif

 #define QTICK_DIV_FACTOR	0x249F

 struct sns_ssc_control_s {
 	struct class *dev_class;
 	dev_t dev_num;
 	struct device *dev;
 	struct cdev *cdev;
 };
 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);

 static ssize_t slpi_ssr_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 kobj_attribute slpi_ssr_attribute =
 	__ATTR(ssr, 0220, NULL, slpi_ssr_store);

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

 static struct platform_device *slpi_private;
 static struct work_struct slpi_ldr_work;

 static void slpi_load_fw(struct work_struct *slpi_ldr_work)
 {
 	struct platform_device *pdev = slpi_private;
 	struct slpi_loader_private *priv = NULL;
 	int ret;
 	const char *firmware_name = 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;
 	}

 	ret = of_property_read_string(pdev->dev.of_node,
 		"qcom,firmware-name", &firmware_name);
 	if (ret < 0) {
 		pr_err("can't get fw name.\n");
 		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_with_fwname("slpi", firmware_name);
 	if (IS_ERR(priv->pil_h)) {
 		dev_err(&pdev->dev, "%s: pil get failed,\n",
 			__func__);
 		goto fail;
 	}

 	dev_dbg(&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_do(struct platform_device *pdev)
 {
 	dev_dbg(&pdev->dev, "%s: scheduling work to load SLPI fw\n", __func__);
 	schedule_work(&slpi_ldr_work);
 }

 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_ssr_store(struct kobject *kobj,
 	struct kobj_attribute *attr,
 	const char *buf,
 	size_t count)
 {
 	int ssr_cmd = 0;
 	struct subsys_device *sns_dev = NULL;
 	struct platform_device *pdev = slpi_private;
 	struct slpi_loader_private *priv = NULL;

 	pr_debug("%s: going to call slpi_ssr\n", __func__);

 	if (kstrtoint(buf, 10, &ssr_cmd) < 0)
 		return -EINVAL;

 	if (ssr_cmd != SSR_RESET_CMD)
 		return -EINVAL;

 	priv = platform_get_drvdata(pdev);
 	if (!priv)
 		return -EINVAL;

 	sns_dev = (struct subsys_device *)priv->pil_h;
 	if (!sns_dev)
 		return -EINVAL;

 	dev_err(&pdev->dev, "Something went wrong with SLPI, restarting\n");

 	/* subsystem_restart_dev has worker queue to handle */
 	if (subsystem_restart_dev(sns_dev) != 0) {
 		dev_err(&pdev->dev, "subsystem_restart_dev failed\n");
 		return -EINVAL;
 	}

 	dev_dbg(&pdev->dev, "SLPI restarted\n");
 	return count;
 }

 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 virtual QTimer clock ticks and scale down to 32KHz clock as used
  * in DSPS
  */
 static u32 sns_read_qtimer(void)
 {
 	u64 val;

 	val = arch_counter_get_cntvct();
 	/*
 	 * To convert ticks from 19.2 Mhz clock to 32768 Hz clock:
 	 * x = (value * 32768) / 19200000
 	 * This is same as first left shift the value by 4 bits, i.e. multiply
 	 * by 16, and then divide by 0x249F. The latter is preferable since
 	 * QTimer tick (value) is 56-bit, so (value * 32768) could overflow,
 	 * while (value * 16) will never do
 	 */
 	val <<= 4;
 	do_div(val, QTICK_DIV_FACTOR);

 	return (u32)val;
 }

 static int sensors_ssc_open(struct inode *ip, struct file *fp)
 {
 	return 0;
 }

 static int sensors_ssc_release(struct inode *inode, struct file *file)
 {
 	return 0;
 }

 static long sensors_ssc_ioctl(struct file *file,
 			unsigned int cmd, unsigned long arg)
 {
 	int ret = 0;
 	u32 val = 0;

 	switch (cmd) {
 	case DSPS_IOCTL_READ_SLOW_TIMER:
 #ifdef CONFIG_COMPAT
 	case DSPS_IOCTL_READ_SLOW_TIMER32:
 #endif
 		val = sns_read_qtimer();
 		ret = put_user(val, (u32 __user *) arg);
 		break;

 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 const struct file_operations sensors_ssc_fops = {
 	.owner = THIS_MODULE,
 	.open = sensors_ssc_open,
 	.release = sensors_ssc_release,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = sensors_ssc_ioctl,
 #endif
 	.unlocked_ioctl = sensors_ssc_ioctl
 };

 static int sensors_ssc_probe(struct platform_device *pdev)
 {
 	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);
 	if (sns_ctl.dev_class == NULL) {
 		pr_err("%s: class_create fail.\n", __func__);
 		goto res_err;
 	}

 	ret = alloc_chrdev_region(&sns_ctl.dev_num, 0, 1, DRV_NAME);
 	if (ret) {
 		pr_err("%s: alloc_chrdev_region fail.\n", __func__);
 		goto alloc_chrdev_region_err;
 	}

 	sns_ctl.dev = device_create(sns_ctl.dev_class, NULL,
 				     sns_ctl.dev_num,
 				     &sns_ctl, DRV_NAME);
 	if (IS_ERR(sns_ctl.dev)) {
 		pr_err("%s: device_create fail.\n", __func__);
 		goto device_create_err;
 	}

 	sns_ctl.cdev = cdev_alloc();
 	if (sns_ctl.cdev == NULL) {
 		pr_err("%s: cdev_alloc fail.\n", __func__);
 		goto cdev_alloc_err;
 	}
 	cdev_init(sns_ctl.cdev, &sensors_ssc_fops);
 	sns_ctl.cdev->owner = THIS_MODULE;

 	ret = cdev_add(sns_ctl.cdev, sns_ctl.dev_num, 1);
 	if (ret) {
 		pr_err("%s: cdev_add fail.\n", __func__);
 		goto cdev_add_err;
 	}

 	INIT_WORK(&slpi_ldr_work, slpi_load_fw);

 	return 0;

 cdev_add_err:
 	kfree(sns_ctl.cdev);
 cdev_alloc_err:
 	device_destroy(sns_ctl.dev_class, sns_ctl.dev_num);
 device_create_err:
 	unregister_chrdev_region(sns_ctl.dev_num, 1);
 alloc_chrdev_region_err:
 	class_destroy(sns_ctl.dev_class);
 res_err:
 	return -ENODEV;
 }

 static int sensors_ssc_remove(struct platform_device *pdev)
 {
 	slpi_loader_remove(pdev);
 	cdev_del(sns_ctl.cdev);
 	kfree(sns_ctl.cdev);
 	sns_ctl.cdev = NULL;
 	device_destroy(sns_ctl.dev_class, sns_ctl.dev_num);
 	unregister_chrdev_region(sns_ctl.dev_num, 1);
 	class_destroy(sns_ctl.dev_class);

 	return 0;
 }

 static const struct of_device_id msm_ssc_sensors_dt_match[] = {
 	{.compatible = "qcom,msm-ssc-sensors"},
 	{},
 };
 MODULE_DEVICE_TABLE(of, msm_ssc_sensors_dt_match);

 static struct platform_driver sensors_ssc_driver = {
 	.driver = {
 		.name = "sensors-ssc",
 		.owner = THIS_MODULE,
 		.of_match_table = msm_ssc_sensors_dt_match,
 	},
 	.probe = sensors_ssc_probe,
 	.remove = sensors_ssc_remove,
 };

 static int __init sensors_ssc_init(void)
 {
 	int rc;

 	pr_debug("%s driver version %s.\n", DRV_NAME, DRV_VERSION);
 	rc = platform_driver_register(&sensors_ssc_driver);
 	if (rc) {
 		pr_err("%s: Failed to register sensors ssc driver\n",
 			__func__);
 		return rc;
 	}

 	return 0;
 }

 static void __exit sensors_ssc_exit(void)
 {
 	platform_driver_unregister(&sensors_ssc_driver);
 }

 module_init(sensors_ssc_init);
 module_exit(sensors_ssc_exit);
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Sensors SSC driver");
	/* Copyright (c) 2012-2017, 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/types.h>
	#include <linux/msm_dsps.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/platform_device.h>
	#include <linux/cdev.h>
	#include <linux/fs.h>
	#include <linux/of_device.h>
	#include <asm/arch_timer.h>
	#include <linux/uaccess.h>

	#include <linux/kernel.h>
	#include <linux/err.h>
	#include <linux/delay.h>
	#include <linux/sysfs.h>
	#include <linux/workqueue.h>

	#include <soc/qcom/subsystem_restart.h>

	#define IMAGE_LOAD_CMD 1
	#define IMAGE_UNLOAD_CMD 0
	#define SSR_RESET_CMD 1
	#define CLASS_NAME "ssc"
	#define DRV_NAME "sensors"
	#define DRV_VERSION "2.00"
	#ifdef CONFIG_COMPAT
	#define DSPS_IOCTL_READ_SLOW_TIMER32 _IOR(DSPS_IOCTL_MAGIC, 3, compat_uint_t)
	#endif

	#define QTICK_DIV_FACTOR 0x249F

	struct sns_ssc_control_s {
	struct class *dev_class;
	dev_t dev_num;
	struct device *dev;
	struct cdev *cdev;
	};
	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);

	static ssize_t slpi_ssr_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 kobj_attribute slpi_ssr_attribute =
	__ATTR(ssr, 0220, NULL, slpi_ssr_store);

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

	static struct platform_device *slpi_private;
	static struct work_struct slpi_ldr_work;

	static void slpi_load_fw(struct work_struct *slpi_ldr_work)
	{
	struct platform_device *pdev = slpi_private;
	struct slpi_loader_private *priv = NULL;
	int ret;
	const char *firmware_name = 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;
	}

	ret = of_property_read_string(pdev->dev.of_node,
	"qcom,firmware-name", &firmware_name);
	if (ret < 0) {
	pr_err("can't get fw name.\n");
	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_with_fwname("slpi", firmware_name);
	if (IS_ERR(priv->pil_h)) {
	dev_err(&pdev->dev, "%s: pil get failed,\n",
	__func__);
	goto fail;
	}

	dev_dbg(&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_do(struct platform_device *pdev)
	{
	dev_dbg(&pdev->dev, "%s: scheduling work to load SLPI fw\n", __func__);
	schedule_work(&slpi_ldr_work);
	}

	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_ssr_store(struct kobject *kobj,
	struct kobj_attribute *attr,
	const char *buf,
	size_t count)
	{
	int ssr_cmd = 0;
	struct subsys_device *sns_dev = NULL;
	struct platform_device *pdev = slpi_private;
	struct slpi_loader_private *priv = NULL;

	pr_debug("%s: going to call slpi_ssr\n", __func__);

	if (kstrtoint(buf, 10, &ssr_cmd) < 0)
	return -EINVAL;

	if (ssr_cmd != SSR_RESET_CMD)
	return -EINVAL;

	priv = platform_get_drvdata(pdev);
	if (!priv)
	return -EINVAL;

	sns_dev = (struct subsys_device *)priv->pil_h;
	if (!sns_dev)
	return -EINVAL;

	dev_err(&pdev->dev, "Something went wrong with SLPI, restarting\n");

	/* subsystem_restart_dev has worker queue to handle */
	if (subsystem_restart_dev(sns_dev) != 0) {
	dev_err(&pdev->dev, "subsystem_restart_dev failed\n");
	return -EINVAL;
	}

	dev_dbg(&pdev->dev, "SLPI restarted\n");
	return count;
	}

	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 virtual QTimer clock ticks and scale down to 32KHz clock as used
	* in DSPS
	*/
	static u32 sns_read_qtimer(void)
	{
	u64 val;

	val = arch_counter_get_cntvct();
	/*
	* To convert ticks from 19.2 Mhz clock to 32768 Hz clock:
	* x = (value * 32768) / 19200000
	* This is same as first left shift the value by 4 bits, i.e. multiply
	* by 16, and then divide by 0x249F. The latter is preferable since
	* QTimer tick (value) is 56-bit, so (value * 32768) could overflow,
	* while (value * 16) will never do
	*/
	val <<= 4;
	do_div(val, QTICK_DIV_FACTOR);

	return (u32)val;
	}

	static int sensors_ssc_open(struct inode ip, struct file fp)
	{
	return 0;
	}

	static int sensors_ssc_release(struct inode inode, struct file file)
	{
	return 0;
	}

	static long sensors_ssc_ioctl(struct file *file,
	unsigned int cmd, unsigned long arg)
	{
	int ret = 0;
	u32 val = 0;

	switch (cmd) {
	case DSPS_IOCTL_READ_SLOW_TIMER:
	#ifdef CONFIG_COMPAT
	case DSPS_IOCTL_READ_SLOW_TIMER32:
	#endif
	val = sns_read_qtimer();
	ret = put_user(val, (u32 __user *) arg);
	break;

	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	const struct file_operations sensors_ssc_fops = {
	.owner = THIS_MODULE,
	.open = sensors_ssc_open,
	.release = sensors_ssc_release,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = sensors_ssc_ioctl,
	#endif
	.unlocked_ioctl = sensors_ssc_ioctl
	};

	static int sensors_ssc_probe(struct platform_device *pdev)
	{
	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);
	if (sns_ctl.dev_class == NULL) {
	pr_err("%s: class_create fail.\n", __func__);
	goto res_err;
	}

	ret = alloc_chrdev_region(&sns_ctl.dev_num, 0, 1, DRV_NAME);
	if (ret) {
	pr_err("%s: alloc_chrdev_region fail.\n", __func__);
	goto alloc_chrdev_region_err;
	}

	sns_ctl.dev = device_create(sns_ctl.dev_class, NULL,
	sns_ctl.dev_num,
	&sns_ctl, DRV_NAME);
	if (IS_ERR(sns_ctl.dev)) {
	pr_err("%s: device_create fail.\n", __func__);
	goto device_create_err;
	}

	sns_ctl.cdev = cdev_alloc();
	if (sns_ctl.cdev == NULL) {
	pr_err("%s: cdev_alloc fail.\n", __func__);
	goto cdev_alloc_err;
	}
	cdev_init(sns_ctl.cdev, &sensors_ssc_fops);
	sns_ctl.cdev->owner = THIS_MODULE;

	ret = cdev_add(sns_ctl.cdev, sns_ctl.dev_num, 1);
	if (ret) {
	pr_err("%s: cdev_add fail.\n", __func__);
	goto cdev_add_err;
	}

	INIT_WORK(&slpi_ldr_work, slpi_load_fw);

	return 0;

	cdev_add_err:
	kfree(sns_ctl.cdev);
	cdev_alloc_err:
	device_destroy(sns_ctl.dev_class, sns_ctl.dev_num);
	device_create_err:
	unregister_chrdev_region(sns_ctl.dev_num, 1);
	alloc_chrdev_region_err:
	class_destroy(sns_ctl.dev_class);
	res_err:
	return -ENODEV;
	}

	static int sensors_ssc_remove(struct platform_device *pdev)
	{
	slpi_loader_remove(pdev);
	cdev_del(sns_ctl.cdev);
	kfree(sns_ctl.cdev);
	sns_ctl.cdev = NULL;
	device_destroy(sns_ctl.dev_class, sns_ctl.dev_num);
	unregister_chrdev_region(sns_ctl.dev_num, 1);
	class_destroy(sns_ctl.dev_class);

	return 0;
	}

	static const struct of_device_id msm_ssc_sensors_dt_match[] = {
	{.compatible = "qcom,msm-ssc-sensors"},
	{},
	};
	MODULE_DEVICE_TABLE(of, msm_ssc_sensors_dt_match);

	static struct platform_driver sensors_ssc_driver = {
	.driver = {
	.name = "sensors-ssc",
	.owner = THIS_MODULE,
	.of_match_table = msm_ssc_sensors_dt_match,
	},
	.probe = sensors_ssc_probe,
	.remove = sensors_ssc_remove,
	};

	static int __init sensors_ssc_init(void)
	{
	int rc;

	pr_debug("%s driver version %s.\n", DRV_NAME, DRV_VERSION);
	rc = platform_driver_register(&sensors_ssc_driver);
	if (rc) {
	pr_err("%s: Failed to register sensors ssc driver\n",
	__func__);
	return rc;
	}

	return 0;
	}

	static void __exit sensors_ssc_exit(void)
	{
	platform_driver_unregister(&sensors_ssc_driver);
	}

	module_init(sensors_ssc_init);
	module_exit(sensors_ssc_exit);
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Sensors SSC driver");