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Commit eae4fe4d authored by qctecmdr's avatar qctecmdr Committed by Gerrit - the friendly Code Review server
Browse files

Merge "drivers: sensors: add sensors ssc driver"

parents df2f76f8 78761020

drivers/soc/qcom/Kconfig

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@@ -354,4 +354,13 @@ config QCOM_SMP2P_SLEEPSTATE 
	  are sent through the smp2p framework. This driver can also receive

	  notifications from the remote to prevent suspend on the local

	  processor.



config SENSORS_SSC

	tristate "Enable Sensors Driver Support for SSC"

	help

	  Say y or m here to enable Snapdragon Sensor Core(SSC)

	  support for Qualcomm Technologies, Inc SoCs. SSC is used for

	  exercising sensor use-cases. This driver loads firmware files

	  for SSC and also does time synchronization with DSP clock.



endmenu

drivers/soc/qcom/Makefile

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@@ -38,3 +38,4 @@ obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o 
obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o

obj-$(CONFIG_QMP_DEBUGFS_CLIENT) += qmp-debugfs-client.o

obj-$(CONFIG_QCOM_SMP2P_SLEEPSTATE) += smp2p_sleepstate.o

obj-$(CONFIG_SENSORS_SSC) += sensors_ssc.o

drivers/soc/qcom/sensors_ssc.c

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// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2012-2019, The Linux Foundation. All rights reserved.

 */



#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) {

		pr_err("%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:

	pr_err("%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",

		.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");

include/uapi/linux/msm_dsps.h

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/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */

/*

 * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.

 */



#ifndef _UAPI_DSPS_H_

#define _UAPI_DSPS_H_



#include <linux/ioctl.h>



#define DSPS_IOCTL_MAGIC 'd'



#define DSPS_IOCTL_ON	_IO(DSPS_IOCTL_MAGIC, 1)

#define DSPS_IOCTL_OFF	_IO(DSPS_IOCTL_MAGIC, 2)



#define DSPS_IOCTL_READ_SLOW_TIMER _IOR(DSPS_IOCTL_MAGIC, 3, unsigned int*)

#define DSPS_IOCTL_READ_FAST_TIMER _IOR(DSPS_IOCTL_MAGIC, 4, unsigned int*)



#define DSPS_IOCTL_RESET _IO(DSPS_IOCTL_MAGIC, 5)



#endif	/* _UAPI_DSPS_H_ */