android_kernel_samsung_sm8650-modules/qts/qts_core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
 */

#define pr_fmt(fmt)	"%s: " fmt, __func__

#include <linux/vmalloc.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <linux/of_device.h>
#include <linux/sysfs.h>
#include <linux/sort.h>
#include <linux/atomic.h>
#include <linux/pinctrl/qcom-pinctrl.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/component.h>
#include <linux/sched.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/regulator/consumer.h>
#include <linux/debugfs.h>
#include <linux/wait.h>
#include <linux/time.h>
#include "qts_core.h"

static struct qts_data_entries *qts_data_entries;

struct drm_panel *active_panel;

static void qts_trusted_touch_abort_handler(struct qts_data *qts_data, int error);

static struct gh_acl_desc *qts_vm_get_acl(enum gh_vm_names vm_name)
{
	struct gh_acl_desc *acl_desc;
	gh_vmid_t vmid;

	gh_rm_get_vmid(vm_name, &vmid);

	acl_desc = kzalloc(offsetof(struct gh_acl_desc, acl_entries[1]),
			GFP_KERNEL);
	if (!acl_desc)
		return ERR_PTR(ENOMEM);

	acl_desc->n_acl_entries = 1;
	acl_desc->acl_entries[0].vmid = vmid;
	acl_desc->acl_entries[0].perms = GH_RM_ACL_R | GH_RM_ACL_W;

	return acl_desc;
}

static struct gh_sgl_desc *qts_vm_get_sgl(struct trusted_touch_vm_info *vm_info)
{
	struct gh_sgl_desc *sgl_desc;
	int i;

	sgl_desc = kzalloc(offsetof(struct gh_sgl_desc,
			sgl_entries[vm_info->iomem_list_size]), GFP_KERNEL);
	if (!sgl_desc)
		return ERR_PTR(ENOMEM);

	sgl_desc->n_sgl_entries = vm_info->iomem_list_size;

	for (i = 0; i < vm_info->iomem_list_size; i++) {
		sgl_desc->sgl_entries[i].ipa_base = vm_info->iomem_bases[i];
		sgl_desc->sgl_entries[i].size = vm_info->iomem_sizes[i];
	}

	return sgl_desc;
}

static int qts_populate_vm_info_iomem(struct qts_data *qts_data)
{
	int i, gpio, rc = 0;
	int num_regs, num_sizes, num_gpios, list_size;
	struct resource res;
	struct device_node *np = qts_data->dev->of_node;
	struct trusted_touch_vm_info *vm_info = qts_data->vm_info;

	num_regs = of_property_count_u32_elems(np, "qts,trusted-touch-io-bases");
	if (num_regs < 0) {
		pr_err("Invalid number of IO regions specified\n");
		return -EINVAL;
	}

	num_sizes = of_property_count_u32_elems(np, "qts,trusted-touch-io-sizes");
	if (num_sizes < 0) {
		pr_err("Invalid number of IO regions specified\n");
		return -EINVAL;
	}

	if (num_regs != num_sizes) {
		pr_err("IO bases and sizes array lengths mismatch\n");
		return -EINVAL;
	}

	num_gpios = of_gpio_named_count(np, "qts,trusted-touch-vm-gpio-list");
	if (num_gpios < 0) {
		pr_warn("Ignoring invalid trusted gpio list: %d\n", num_gpios);
		num_gpios = 0;
	}

	list_size = num_regs + num_gpios;
	vm_info->iomem_list_size = list_size;
	vm_info->iomem_bases = devm_kcalloc(qts_data->dev, list_size, sizeof(*vm_info->iomem_bases),
			GFP_KERNEL);
	if (!vm_info->iomem_bases)
		return -ENOMEM;

	vm_info->iomem_sizes = devm_kcalloc(qts_data->dev, list_size, sizeof(*vm_info->iomem_sizes),
			GFP_KERNEL);
	if (!vm_info->iomem_sizes)
		return -ENOMEM;

	for (i = 0; i < num_gpios; ++i) {
		gpio = of_get_named_gpio(np, "qts,trusted-touch-vm-gpio-list", i);
		if (gpio < 0 || !gpio_is_valid(gpio)) {
			pr_err("Invalid gpio %d at position %d\n", gpio, i);
			return gpio;
		}

		if (!msm_gpio_get_pin_address(gpio, &res)) {
			pr_err("Failed to retrieve gpio-%d resource\n", gpio);
			return -ENODATA;
		}

		vm_info->iomem_bases[i] = res.start;
		vm_info->iomem_sizes[i] = resource_size(&res);
	}

	rc = of_property_read_u32_array(np, "qts,trusted-touch-io-bases",
			&vm_info->iomem_bases[i], list_size - i);
	if (rc) {
		pr_err("Failed to read trusted touch io bases:%d\n", rc);
		return rc;
	}

	rc = of_property_read_u32_array(np, "qts,trusted-touch-io-sizes",
			&vm_info->iomem_sizes[i], list_size - i);
	if (rc) {
		pr_err("Failed to read trusted touch io sizes:%d\n", rc);
		return rc;
	}

	return 0;
}

static int qts_populate_vm_info(struct qts_data *qts_data)
{
	int rc;
	struct trusted_touch_vm_info *vm_info;
	struct device_node *np = qts_data->dev->of_node;

	vm_info = devm_kzalloc(qts_data->dev, sizeof(struct trusted_touch_vm_info), GFP_KERNEL);
	if (!vm_info)
		return -ENOMEM;

	qts_data->vm_info = vm_info;
	vm_info->vm_name = GH_TRUSTED_VM;
	rc = of_property_read_u32(np, "qts,trusted-touch-spi-irq", &vm_info->hw_irq);
	if (rc) {
		pr_err("Failed to read trusted touch SPI irq:%d\n", rc);
		return rc;
	}

	rc = qts_populate_vm_info_iomem(qts_data);
	if (rc) {
		pr_err("Failed to read trusted touch mmio ranges:%d\n", rc);
		return rc;
	}

	rc = of_property_read_string(np, "qts,trusted-touch-type",
						&vm_info->trusted_touch_type);
	if (rc) {
		pr_warn("%s: No trusted touch type selection made\n");
		vm_info->mem_tag = GH_MEM_NOTIFIER_TAG_TOUCH_PRIMARY;
		vm_info->irq_label = GH_IRQ_LABEL_TRUSTED_TOUCH_PRIMARY;
		rc = 0;
	} else if (!strcmp(vm_info->trusted_touch_type, "primary")) {
		vm_info->mem_tag = GH_MEM_NOTIFIER_TAG_TOUCH_PRIMARY;
		vm_info->irq_label = GH_IRQ_LABEL_TRUSTED_TOUCH_PRIMARY;
	} else if (!strcmp(vm_info->trusted_touch_type, "secondary")) {
		vm_info->mem_tag = GH_MEM_NOTIFIER_TAG_TOUCH_SECONDARY;
		vm_info->irq_label = GH_IRQ_LABEL_TRUSTED_TOUCH_SECONDARY;
	}

	return 0;
}

static void qts_destroy_vm_info(struct qts_data *qts_data)
{
	kfree(qts_data->vm_info->iomem_sizes);
	kfree(qts_data->vm_info->iomem_bases);
	kfree(qts_data->vm_info);
}

static void qts_vm_deinit(struct qts_data *qts_data)
{
	if (qts_data->vm_info->mem_cookie)
		gh_mem_notifier_unregister(qts_data->vm_info->mem_cookie);
	qts_destroy_vm_info(qts_data);
}

static int qts_trusted_touch_get_vm_state(struct qts_data *qts_data)
{
	return atomic_read(&qts_data->vm_info->vm_state);
}

static void qts_trusted_touch_set_vm_state(struct qts_data *qts_data,
							int state)
{
	pr_debug("state %d\n", state);
	atomic_set(&qts_data->vm_info->vm_state, state);
}

#ifdef CONFIG_ARCH_QTI_VM
static int qts_vm_mem_release(struct qts_data *qts_data);
static void qts_trusted_touch_tvm_vm_mode_disable(struct qts_data *qts_data);
static void qts_trusted_touch_abort_tvm(struct qts_data *qts_data);
static void qts_trusted_touch_event_notify(struct qts_data *qts_data, int event);

static void qts_irq_enable(struct qts_data *qts_data, bool en)
{
	if (en) {
		if (qts_data->irq_disabled) {
			pr_debug("qts irq enable\n");
			enable_irq(qts_data->irq);
			qts_data->irq_disabled = false;
		}
	} else {
		if (!qts_data->irq_disabled) {
			pr_debug("qts irq disable\n");
			disable_irq_nosync(qts_data->irq);
			qts_data->irq_disabled = true;
		}
	}
}

static irqreturn_t  qts_irq_handler(int irq, void *data)
{
	struct qts_data *qts_data = data;

	if (!mutex_trylock(&qts_data->transition_lock))
		return IRQ_HANDLED;

	qts_data->vendor_ops.irq_handler(irq, qts_data->vendor_data);
	mutex_unlock(&qts_data->transition_lock);
	return IRQ_HANDLED;
}

static int qts_irq_registration(struct qts_data *qts_data)
{
	int ret = 0;

	qts_data->irq_gpio_flags = IRQF_TRIGGER_RISING;
	pr_debug("irq:%d, flag:%x\n", qts_data->irq, qts_data->irq_gpio_flags);
	ret = request_threaded_irq(qts_data->irq, NULL, qts_irq_handler,
				qts_data->irq_gpio_flags | IRQF_ONESHOT,
				QTS_NAME, qts_data);
	if (ret != 0)
		pr_err("request_threaded_irq failed\n");
	if (ret == 0)
		qts_irq_enable(qts_data, false);

	return ret;
}

void qts_trusted_touch_tvm_i2c_failure_report(struct qts_data *qts_data)
{
	pr_warn("initiating trusted touch abort due to i2c failure\n");
	qts_trusted_touch_abort_handler(qts_data, TRUSTED_TOUCH_EVENT_I2C_FAILURE);
}

static void qts_trusted_touch_reset_gpio_toggle(struct qts_data *qts_data)
{
	void __iomem *base;

	if (qts_data->bus_type != QTS_BUS_TYPE_I2C)
		return;

	base = ioremap(TOUCH_RESET_GPIO_BASE, TOUCH_RESET_GPIO_SIZE);
	writel_relaxed(0x1, base + TOUCH_RESET_GPIO_OFFSET);
	/* wait until toggle to finish*/
	wmb();
	writel_relaxed(0x0, base + TOUCH_RESET_GPIO_OFFSET);
	/* wait until toggle to finish*/
	wmb();
	iounmap(base);
}

static void qts_trusted_touch_intr_gpio_toggle(struct qts_data *qts_data,
		bool enable)
{
	void __iomem *base;
	u32 val;

	if (qts_data->bus_type != QTS_BUS_TYPE_I2C)
		return;

	base = ioremap(TOUCH_INTR_GPIO_BASE, TOUCH_INTR_GPIO_SIZE);
	val = readl_relaxed(base + TOUCH_RESET_GPIO_OFFSET);
	if (enable) {
		val |= BIT(0);
		writel_relaxed(val, base + TOUCH_INTR_GPIO_OFFSET);
		/* wait until toggle to finish*/
		wmb();
	} else {
		val &= ~BIT(0);
		writel_relaxed(val, base + TOUCH_INTR_GPIO_OFFSET);
		/* wait until toggle to finish*/
		wmb();
	}
	iounmap(base);
}

static int qts_sgl_cmp(const void *a, const void *b)
{
	struct gh_sgl_entry *left = (struct gh_sgl_entry *)a;
	struct gh_sgl_entry *right = (struct gh_sgl_entry *)b;

	return (left->ipa_base - right->ipa_base);
}

static int qts_vm_compare_sgl_desc(struct gh_sgl_desc *expected,
		struct gh_sgl_desc *received)
{
	int idx;

	if (expected->n_sgl_entries != received->n_sgl_entries)
		return -E2BIG;
	sort(received->sgl_entries, received->n_sgl_entries,
			sizeof(received->sgl_entries[0]), qts_sgl_cmp, NULL);
	sort(expected->sgl_entries, expected->n_sgl_entries,
			sizeof(expected->sgl_entries[0]), qts_sgl_cmp, NULL);

	for (idx = 0; idx < expected->n_sgl_entries; idx++) {
		struct gh_sgl_entry *left = &expected->sgl_entries[idx];
		struct gh_sgl_entry *right = &received->sgl_entries[idx];

		if ((left->ipa_base != right->ipa_base) ||
				(left->size != right->size)) {
			pr_err("sgl mismatch: left_base:%d right base:%d left size:%d right size:%d\n",
				left->ipa_base, right->ipa_base, left->size, right->size);

			return -EINVAL;
		}
	}
	return 0;
}

static int qts_vm_handle_vm_hardware(struct qts_data *qts_data)
{
	int rc = 0;

	if (atomic_read(&qts_data->delayed_tvm_probe_pending)) {
		rc = qts_irq_registration(qts_data);
		if (rc) {
			pr_err("irq registration failure on TVM!\n");
			return rc;
		}
		atomic_set(&qts_data->delayed_tvm_probe_pending, 0);
	}

	qts_irq_enable(qts_data, true);
	qts_trusted_touch_set_vm_state(qts_data, TVM_INTERRUPT_ENABLED);
	return rc;
}

static void qts_trusted_touch_tvm_vm_mode_enable(struct qts_data *qts_data)
{

	struct gh_sgl_desc *sgl_desc, *expected_sgl_desc;
	struct gh_acl_desc *acl_desc;
	struct irq_data *irq_data;
	int rc = 0;
	int irq = 0;

	mutex_lock(&qts_data->transition_lock);
	if (qts_trusted_touch_get_vm_state(qts_data) != TVM_ALL_RESOURCES_LENT_NOTIFIED) {
		pr_info("All lend notifications not received\n");
		qts_trusted_touch_event_notify(qts_data,
				TRUSTED_TOUCH_EVENT_NOTIFICATIONS_PENDING);
		mutex_unlock(&qts_data->transition_lock);
		return;
	}

	if (qts_data->vendor_ops.pre_le_tui_enable)
		qts_data->vendor_ops.pre_le_tui_enable(qts_data->vendor_data);

	acl_desc = qts_vm_get_acl(GH_TRUSTED_VM);
	if (IS_ERR(acl_desc)) {
		pr_err("failed to populated acl data:rc=%d\n", PTR_ERR(acl_desc));
		goto accept_fail;
	}

	sgl_desc = gh_rm_mem_accept(qts_data->vm_info->vm_mem_handle,
			GH_RM_MEM_TYPE_IO,
			GH_RM_TRANS_TYPE_LEND,
			GH_RM_MEM_ACCEPT_VALIDATE_ACL_ATTRS |
			GH_RM_MEM_ACCEPT_VALIDATE_LABEL |
			GH_RM_MEM_ACCEPT_DONE,  TRUSTED_TOUCH_MEM_LABEL,
			acl_desc, NULL, NULL, 0);
	if (IS_ERR_OR_NULL(sgl_desc)) {
		pr_err("failed to do mem accept :rc=%d\n", PTR_ERR(sgl_desc));
		goto acl_fail;
	}
	qts_trusted_touch_set_vm_state(qts_data, TVM_IOMEM_ACCEPTED);

	/* Initiate session on tvm */
	if (qts_data->bus_type == QTS_BUS_TYPE_I2C)
		rc = pm_runtime_get_sync(qts_data->client->adapter->dev.parent);
	else
		rc = pm_runtime_get_sync(qts_data->spi->master->dev.parent);

	if (rc < 0) {
		pr_err("failed to get sync rc:%d\n", rc);
		goto acl_fail;
	}
	qts_trusted_touch_set_vm_state(qts_data, TVM_I2C_SESSION_ACQUIRED);

	expected_sgl_desc = qts_vm_get_sgl(qts_data->vm_info);
	if (qts_vm_compare_sgl_desc(expected_sgl_desc, sgl_desc)) {
		pr_err("IO sg list does not match\n");
		goto sgl_cmp_fail;
	}

	kfree(expected_sgl_desc);
	kfree(acl_desc);

	irq = gh_irq_accept(qts_data->vm_info->irq_label, -1, IRQ_TYPE_EDGE_RISING);
	qts_trusted_touch_intr_gpio_toggle(qts_data, false);
	if (irq < 0) {
		pr_err("failed to accept irq\n");
		goto accept_fail;
	}
	qts_trusted_touch_set_vm_state(qts_data, TVM_IRQ_ACCEPTED);


	irq_data = irq_get_irq_data(irq);
	if (!irq_data) {
		pr_err("Invalid irq data for trusted touch\n");
		goto accept_fail;
	}
	if (!irq_data->hwirq) {
		pr_err("Invalid irq in irq data\n");
		goto accept_fail;
	}
	if (irq_data->hwirq != qts_data->vm_info->hw_irq) {
		pr_err("Invalid irq lent\n");
		goto accept_fail;
	}

	pr_debug("irq:returned from accept:%d\n", irq);
	qts_data->irq = irq;

	rc = qts_vm_handle_vm_hardware(qts_data);
	if (rc) {
		pr_err("Delayed probe failure on TVM!\n");
		goto accept_fail;
	}
	atomic_set(&qts_data->trusted_touch_enabled, 1);

	if (qts_data->vendor_ops.post_le_tui_enable)
		qts_data->vendor_ops.post_le_tui_enable(qts_data->vendor_data);

	pr_debug("trusted touch enabled\n");

	mutex_unlock(&qts_data->transition_lock);
	return;
sgl_cmp_fail:
	kfree(expected_sgl_desc);
acl_fail:
	kfree(acl_desc);
accept_fail:
	qts_trusted_touch_abort_handler(qts_data,
			TRUSTED_TOUCH_EVENT_ACCEPT_FAILURE);
	mutex_unlock(&qts_data->transition_lock);
}

static void qts_vm_irq_on_lend_callback(void *data,
					unsigned long notif_type,
					enum gh_irq_label label)
{
	struct qts_data *qts_data = data;

	pr_debug("received irq lend request for label:%d\n", label);
	if (qts_trusted_touch_get_vm_state(qts_data) == TVM_IOMEM_LENT_NOTIFIED)
		qts_trusted_touch_set_vm_state(qts_data, TVM_ALL_RESOURCES_LENT_NOTIFIED);
	else
		qts_trusted_touch_set_vm_state(qts_data, TVM_IRQ_LENT_NOTIFIED);
}

static void qts_vm_mem_on_lend_handler(enum gh_mem_notifier_tag tag,
		unsigned long notif_type, void *entry_data, void *notif_msg)
{
	struct gh_rm_notif_mem_shared_payload *payload;
	struct trusted_touch_vm_info *vm_info;
	struct qts_data *qts_data;

	qts_data = (struct qts_data *)entry_data;
	vm_info = qts_data->vm_info;
	if (!vm_info) {
		pr_err("Invalid vm_info\n");
		return;
	}

	if (notif_type != GH_RM_NOTIF_MEM_SHARED ||
			tag != vm_info->mem_tag) {
		pr_err("Invalid command passed from rm\n");
		return;
	}

	if (!entry_data || !notif_msg) {
		pr_err("Invalid entry data passed from rm\n");
		return;
	}

	payload = (struct gh_rm_notif_mem_shared_payload  *)notif_msg;
	if (payload->trans_type != GH_RM_TRANS_TYPE_LEND ||
			payload->label != TRUSTED_TOUCH_MEM_LABEL) {
		pr_err("Invalid label or transaction type\n");
		return;
	}

	vm_info->vm_mem_handle = payload->mem_handle;
	pr_debug("received mem lend request with handle:%d\n", vm_info->vm_mem_handle);

	if (qts_trusted_touch_get_vm_state(qts_data) == TVM_IRQ_LENT_NOTIFIED)
		qts_trusted_touch_set_vm_state(qts_data, TVM_ALL_RESOURCES_LENT_NOTIFIED);
	else
		qts_trusted_touch_set_vm_state(qts_data, TVM_IOMEM_LENT_NOTIFIED);
}

static int qts_vm_mem_release(struct qts_data *qts_data)
{
	int rc = 0;

	if (!qts_data->vm_info->vm_mem_handle) {
		pr_err("Invalid memory handle\n");
		return -EINVAL;
	}

	rc = gh_rm_mem_release(qts_data->vm_info->vm_mem_handle, 0);
	if (rc)
		pr_err("VM mem release failed: rc=%d\n", rc);

	rc = gh_rm_mem_notify(qts_data->vm_info->vm_mem_handle,
				GH_RM_MEM_NOTIFY_OWNER_RELEASED,
				qts_data->vm_info->mem_tag, 0);
	if (rc)
		pr_err("Failed to notify mem release to PVM: rc=%d\n", rc);

	pr_debug("vm mem release success\n");

	qts_data->vm_info->vm_mem_handle = 0;
	return rc;
}

static void qts_trusted_touch_tvm_vm_mode_disable(struct qts_data *qts_data)
{
	int rc = 0;

	mutex_lock(&qts_data->transition_lock);
	if (atomic_read(&qts_data->trusted_touch_abort_status)) {
		qts_trusted_touch_abort_tvm(qts_data);
		mutex_unlock(&qts_data->transition_lock);
		return;
	}

	if (qts_data->vendor_ops.pre_le_tui_disable)
		qts_data->vendor_ops.pre_le_tui_disable(qts_data->vendor_data);

	qts_irq_enable(qts_data, false);
	qts_trusted_touch_set_vm_state(qts_data, TVM_INTERRUPT_DISABLED);

	rc = gh_irq_release(qts_data->vm_info->irq_label);
	if (rc) {
		pr_err("Failed to release irq rc:%d\n", rc);
		goto error;
	} else {
		qts_trusted_touch_set_vm_state(qts_data, TVM_IRQ_RELEASED);
	}
	rc = gh_irq_release_notify(qts_data->vm_info->irq_label);
	if (rc)
		pr_err("Failed to notify release irq rc:%d\n", rc);

	pr_debug("vm irq release success\n");

	if (qts_data->bus_type == QTS_BUS_TYPE_I2C)
		pm_runtime_put_sync(qts_data->client->adapter->dev.parent);
	else
		pm_runtime_put_sync(qts_data->spi->master->dev.parent);

	qts_trusted_touch_set_vm_state(qts_data, TVM_I2C_SESSION_RELEASED);
	rc = qts_vm_mem_release(qts_data);
	if (rc) {
		pr_err("Failed to release mem rc:%d\n", rc);
		goto error;
	} else {
		qts_trusted_touch_set_vm_state(qts_data, TVM_IOMEM_RELEASED);
	}
	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_TVM_INIT);
	atomic_set(&qts_data->trusted_touch_enabled, 0);

	if (qts_data->vendor_ops.post_le_tui_disable)
		qts_data->vendor_ops.post_le_tui_disable(qts_data->vendor_data);

	pr_debug("trusted touch disabled\n");
	mutex_unlock(&qts_data->transition_lock);
	return;
error:
	qts_trusted_touch_abort_handler(qts_data,
			TRUSTED_TOUCH_EVENT_RELEASE_FAILURE);
	mutex_unlock(&qts_data->transition_lock);
}

static int qts_handle_trusted_touch_tvm(struct qts_data *qts_data, int value)
{
	int err = 0;

	switch (value) {
	case 0:
		if ((atomic_read(&qts_data->trusted_touch_enabled) == 0) &&
			(atomic_read(&qts_data->trusted_touch_abort_status) == 0)) {
			pr_err("Trusted touch is already disabled\n");
			break;
		}
		if (atomic_read(&qts_data->trusted_touch_mode) ==
				TRUSTED_TOUCH_VM_MODE) {
			qts_trusted_touch_tvm_vm_mode_disable(qts_data);
		} else {
			pr_err("Unsupported trusted touch mode\n");
		}
		break;

	case 1:
		if (atomic_read(&qts_data->trusted_touch_enabled)) {
			pr_err("Trusted touch usecase underway\n");
			err = -EBUSY;
			break;
		}
		if (atomic_read(&qts_data->trusted_touch_mode) ==
				TRUSTED_TOUCH_VM_MODE) {
			qts_trusted_touch_tvm_vm_mode_enable(qts_data);
		} else {
			pr_err("Unsupported trusted touch mode\n");
		}
		break;

	default:
		pr_err("unsupported value: %lu\n", value);
		err = -EINVAL;
		break;
	}

	return err;
}

static void qts_trusted_touch_abort_tvm(struct qts_data *qts_data)
{
	int rc = 0;
	int vm_state = qts_trusted_touch_get_vm_state(qts_data);

	if (vm_state >= TRUSTED_TOUCH_TVM_STATE_MAX) {
		pr_err("invalid tvm driver state: %d\n", vm_state);
		return;
	}

	switch (vm_state) {
	case TVM_INTERRUPT_ENABLED:
		qts_irq_enable(qts_data, false);
	case TVM_IRQ_ACCEPTED:
	case TVM_INTERRUPT_DISABLED:
		rc = gh_irq_release(qts_data->vm_info->irq_label);
		if (rc)
			pr_err("Failed to release irq rc:%d\n", rc);
		rc = gh_irq_release_notify(qts_data->vm_info->irq_label);
		if (rc)
			pr_err("Failed to notify irq release rc:%d\n", rc);
	case TVM_I2C_SESSION_ACQUIRED:
	case TVM_IOMEM_ACCEPTED:
	case TVM_IRQ_RELEASED:
		if (qts_data->bus_type == QTS_BUS_TYPE_I2C)
			pm_runtime_put_sync(qts_data->client->adapter->dev.parent);
		else
			pm_runtime_put_sync(qts_data->spi->master->dev.parent);
	case TVM_I2C_SESSION_RELEASED:
		rc = qts_vm_mem_release(qts_data);
		if (rc)
			pr_err("Failed to release mem rc:%d\n", rc);
	case TVM_IOMEM_RELEASED:
	case TVM_ALL_RESOURCES_LENT_NOTIFIED:
	case TRUSTED_TOUCH_TVM_INIT:
	case TVM_IRQ_LENT_NOTIFIED:
	case TVM_IOMEM_LENT_NOTIFIED:
		atomic_set(&qts_data->trusted_touch_enabled, 0);
	}

	atomic_set(&qts_data->trusted_touch_abort_status, 0);
	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_TVM_INIT);
}

#else

static void qts_bus_put(struct qts_data *qts_data);
static int qts_enable_reg(struct qts_data *qts_data, bool enable);

static void qts_trusted_touch_abort_pvm(struct qts_data *qts_data)
{
	int rc = 0;
	int vm_state = qts_trusted_touch_get_vm_state(qts_data);

	if (vm_state >= TRUSTED_TOUCH_PVM_STATE_MAX) {
		pr_err("Invalid driver state: %d\n", vm_state);
		return;
	}

	switch (vm_state) {
	case PVM_IRQ_RELEASE_NOTIFIED:
	case PVM_ALL_RESOURCES_RELEASE_NOTIFIED:
	case PVM_IRQ_LENT:
	case PVM_IRQ_LENT_NOTIFIED:
		rc = gh_irq_reclaim(qts_data->vm_info->irq_label);
		if (rc)
			pr_err("failed to reclaim irq on pvm rc:%d\n", rc);
	case PVM_IRQ_RECLAIMED:
	case PVM_IOMEM_LENT:
	case PVM_IOMEM_LENT_NOTIFIED:
	case PVM_IOMEM_RELEASE_NOTIFIED:
		rc = gh_rm_mem_reclaim(qts_data->vm_info->vm_mem_handle, 0);
		if (rc)
			pr_err("failed to reclaim iomem on pvm rc:%d\n", rc);
		qts_data->vm_info->vm_mem_handle = 0;
	case PVM_IOMEM_RECLAIMED:
	case PVM_INTERRUPT_DISABLED:
		if (qts_data->vendor_ops.enable_touch_irq)
			qts_data->vendor_ops.enable_touch_irq(qts_data->vendor_data, true);
	case PVM_I2C_RESOURCE_ACQUIRED:
	case PVM_INTERRUPT_ENABLED:
		qts_bus_put(qts_data);
	case TRUSTED_TOUCH_PVM_INIT:
	case PVM_I2C_RESOURCE_RELEASED:
		atomic_set(&qts_data->trusted_touch_enabled, 0);
		atomic_set(&qts_data->trusted_touch_transition, 0);
	}

	atomic_set(&qts_data->trusted_touch_abort_status, 0);

	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_PVM_INIT);
}

static int qts_clk_prepare_enable(struct qts_data *qts_data)
{
	int ret;

	ret = clk_prepare_enable(qts_data->iface_clk);
	if (ret) {
		pr_err("error on clk_prepare_enable(iface_clk):%d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(qts_data->core_clk);
	if (ret) {
		clk_disable_unprepare(qts_data->iface_clk);
		pr_err("error clk_prepare_enable(core_clk):%d\n", ret);
	}
	return ret;
}

static void qts_clk_disable_unprepare(struct qts_data *qts_data)
{
	clk_disable_unprepare(qts_data->core_clk);
	clk_disable_unprepare(qts_data->iface_clk);
}

static int qts_bus_get(struct qts_data *qts_data)
{
	int rc = 0;
	struct device *dev = NULL;

	if (qts_data->schedule_suspend)
		cancel_work_sync(&qts_data->suspend_work);
	if (qts_data->schedule_resume)
		cancel_work_sync(&qts_data->resume_work);

	reinit_completion(&qts_data->trusted_touch_powerdown);

	qts_enable_reg(qts_data, true);

	if (qts_data->bus_type == QTS_BUS_TYPE_I2C)
		dev = qts_data->client->adapter->dev.parent;
	else
		dev = qts_data->spi->master->dev.parent;

	mutex_lock(&qts_data->qts_clk_io_ctrl_mutex);
	rc = pm_runtime_get_sync(dev);
	if (rc >= 0 &&  qts_data->core_clk != NULL &&
				qts_data->iface_clk != NULL) {
		rc = qts_clk_prepare_enable(qts_data);
		if (rc)
			pm_runtime_put_sync(dev);
	}

	mutex_unlock(&qts_data->qts_clk_io_ctrl_mutex);
	return rc;
}

static void qts_bus_put(struct qts_data *qts_data)
{
	struct device *dev = NULL;

	if (qts_data->bus_type == QTS_BUS_TYPE_I2C)
		dev = qts_data->client->adapter->dev.parent;
	else
		dev = qts_data->spi->master->dev.parent;

	mutex_lock(&qts_data->qts_clk_io_ctrl_mutex);
	if (qts_data->core_clk != NULL && qts_data->iface_clk != NULL)
		qts_clk_disable_unprepare(qts_data);
	pm_runtime_put_sync(dev);
	mutex_unlock(&qts_data->qts_clk_io_ctrl_mutex);
	complete(&qts_data->trusted_touch_powerdown);
	qts_enable_reg(qts_data, false);
}

static struct gh_notify_vmid_desc *qts_vm_get_vmid(gh_vmid_t vmid)
{
	struct gh_notify_vmid_desc *vmid_desc;

	vmid_desc = kzalloc(offsetof(struct gh_notify_vmid_desc,
				vmid_entries[1]), GFP_KERNEL);
	if (!vmid_desc)
		return ERR_PTR(ENOMEM);

	vmid_desc->n_vmid_entries = 1;
	vmid_desc->vmid_entries[0].vmid = vmid;
	return vmid_desc;
}

static void qts_trusted_touch_pvm_vm_mode_disable(struct qts_data *qts_data)
{
	int rc = 0;

	atomic_set(&qts_data->trusted_touch_transition, 1);

	if (atomic_read(&qts_data->trusted_touch_abort_status)) {
		qts_trusted_touch_abort_pvm(qts_data);
		return;
	}

	if (qts_trusted_touch_get_vm_state(qts_data) != PVM_ALL_RESOURCES_RELEASE_NOTIFIED)
		pr_debug("all release notifications are not received yet\n");

	if (qts_data->vendor_ops.pre_la_tui_disable)
		qts_data->vendor_ops.pre_la_tui_disable(qts_data->vendor_data);

	rc = gh_rm_mem_reclaim(qts_data->vm_info->vm_mem_handle, 0);
	if (rc) {
		pr_err("Trusted touch VM mem reclaim failed rc:%d\n", rc);
		goto error;
	}
	qts_trusted_touch_set_vm_state(qts_data, PVM_IOMEM_RECLAIMED);
	qts_data->vm_info->vm_mem_handle = 0;
	pr_debug("vm mem reclaim success!\n");

	rc = gh_irq_reclaim(qts_data->vm_info->irq_label);
	if (rc) {
		pr_err("failed to reclaim irq on pvm rc:%d\n", rc);
		goto error;
	}
	qts_trusted_touch_set_vm_state(qts_data, PVM_IRQ_RECLAIMED);
	pr_debug("vm irq reclaim success!\n");

	if (qts_data->vendor_ops.enable_touch_irq)
		qts_data->vendor_ops.enable_touch_irq(qts_data->vendor_data, true);

	qts_trusted_touch_set_vm_state(qts_data, PVM_INTERRUPT_ENABLED);
	qts_bus_put(qts_data);
	atomic_set(&qts_data->trusted_touch_transition, 0);
	qts_trusted_touch_set_vm_state(qts_data, PVM_I2C_RESOURCE_RELEASED);
	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_PVM_INIT);
	atomic_set(&qts_data->trusted_touch_enabled, 0);

	if (qts_data->vendor_ops.post_la_tui_disable)
		qts_data->vendor_ops.post_la_tui_disable(qts_data->vendor_data);

	pr_debug("trusted touch disabled\n");
	return;
error:
	qts_trusted_touch_abort_handler(qts_data,
			TRUSTED_TOUCH_EVENT_RECLAIM_FAILURE);
}

static void qts_vm_irq_on_release_callback(void *data,
					unsigned long notif_type,
					enum gh_irq_label label)
{
	struct qts_data *qts_data = data;

	if (notif_type != GH_RM_NOTIF_VM_IRQ_RELEASED) {
		pr_err("invalid notification type\n");
		return;
	}

	if (qts_trusted_touch_get_vm_state(qts_data) == PVM_IOMEM_RELEASE_NOTIFIED)
		qts_trusted_touch_set_vm_state(qts_data, PVM_ALL_RESOURCES_RELEASE_NOTIFIED);
	else
		qts_trusted_touch_set_vm_state(qts_data, PVM_IRQ_RELEASE_NOTIFIED);
}

static void qts_vm_mem_on_release_handler(enum gh_mem_notifier_tag tag,
		unsigned long notif_type, void *entry_data, void *notif_msg)
{
	struct gh_rm_notif_mem_released_payload *release_payload;
	struct trusted_touch_vm_info *vm_info;
	struct qts_data *qts_data;

	qts_data = (struct qts_data *)entry_data;
	vm_info = qts_data->vm_info;
	if (!vm_info) {
		pr_err("Invalid vm_info\n");
		return;
	}

	if (notif_type != GH_RM_NOTIF_MEM_RELEASED) {
		pr_err("Invalid notification type\n");
		return;
	}

	if (tag != vm_info->mem_tag) {
		pr_err("Invalid tag\n");
		return;
	}

	if (!entry_data || !notif_msg) {
		pr_err("Invalid data or notification message\n");
		return;
	}

	release_payload = (struct gh_rm_notif_mem_released_payload  *)notif_msg;
	if (release_payload->mem_handle != vm_info->vm_mem_handle) {
		pr_err("Invalid mem handle detected\n");
		return;
	}

	if (qts_trusted_touch_get_vm_state(qts_data) == PVM_IRQ_RELEASE_NOTIFIED)
		qts_trusted_touch_set_vm_state(qts_data, PVM_ALL_RESOURCES_RELEASE_NOTIFIED);
	else
		qts_trusted_touch_set_vm_state(qts_data, PVM_IOMEM_RELEASE_NOTIFIED);
}

static int qts_vm_mem_lend(struct qts_data *qts_data)
{
	struct gh_acl_desc *acl_desc;
	struct gh_sgl_desc *sgl_desc;
	struct gh_notify_vmid_desc *vmid_desc;
	gh_memparcel_handle_t mem_handle;
	gh_vmid_t trusted_vmid;
	int rc = 0;

	acl_desc = qts_vm_get_acl(GH_TRUSTED_VM);
	if (IS_ERR(acl_desc)) {
		pr_err("Failed to get acl of IO memories for Trusted touch\n");
		rc = PTR_ERR(acl_desc);
		return rc;
	}

	sgl_desc = qts_vm_get_sgl(qts_data->vm_info);
	if (IS_ERR(sgl_desc)) {
		pr_err("Failed to get sgl of IO memories for Trusted touch\n");
		rc = PTR_ERR(sgl_desc);
		goto sgl_error;
	}

	rc = gh_rm_mem_lend(GH_RM_MEM_TYPE_IO, 0, TRUSTED_TOUCH_MEM_LABEL,
			acl_desc, sgl_desc, NULL, &mem_handle);
	if (rc) {
		pr_err("Failed to lend IO memories for Trusted touch rc:%d\n", rc);
		goto error;
	}

	pr_debug("vm mem lend success\n");

	qts_trusted_touch_set_vm_state(qts_data, PVM_IOMEM_LENT);

	gh_rm_get_vmid(GH_TRUSTED_VM, &trusted_vmid);

	vmid_desc = qts_vm_get_vmid(trusted_vmid);

	rc = gh_rm_mem_notify(mem_handle, GH_RM_MEM_NOTIFY_RECIPIENT_SHARED,
			qts_data->vm_info->mem_tag, vmid_desc);
	if (rc) {
		pr_err("Failed to notify mem lend to hypervisor rc:%d\n", rc);
		goto vmid_error;
	}

	qts_trusted_touch_set_vm_state(qts_data, PVM_IOMEM_LENT_NOTIFIED);

	qts_data->vm_info->vm_mem_handle = mem_handle;
vmid_error:
	kfree(vmid_desc);
error:
	kfree(sgl_desc);
sgl_error:
	kfree(acl_desc);

	return rc;
}

static int qts_trusted_touch_pvm_vm_mode_enable(struct qts_data *qts_data)
{
	int rc = 0;
	struct trusted_touch_vm_info *vm_info = qts_data->vm_info;

	atomic_set(&qts_data->trusted_touch_transition, 1);
	mutex_lock(&qts_data->transition_lock);

	if (qts_data->suspended) {
		pr_err("Invalid power state for operation\n");
		atomic_set(&qts_data->trusted_touch_transition, 0);
		rc =  -EPERM;
		goto error;
	}

	if (qts_data->vendor_ops.pre_la_tui_enable)
		qts_data->vendor_ops.pre_la_tui_enable(qts_data->vendor_data);

	/* i2c session start and resource acquire */
	if (qts_bus_get(qts_data) < 0) {
		pr_err("qts_bus_get failed\n");
		rc = -EIO;
		goto error;
	}

	qts_trusted_touch_set_vm_state(qts_data, PVM_I2C_RESOURCE_ACQUIRED);
	if (qts_data->vendor_ops.enable_touch_irq)
		qts_data->vendor_ops.enable_touch_irq(qts_data->vendor_data, false);
	qts_trusted_touch_set_vm_state(qts_data, PVM_INTERRUPT_DISABLED);

	rc = qts_vm_mem_lend(qts_data);
	if (rc) {
		pr_err("Failed to lend memory\n");
		goto abort_handler;
	}
	pr_debug("vm mem lend success\n");

	if (atomic_read(&qts_data->delayed_pvm_probe_pending)) {
		if (qts_data->vendor_ops.get_irq_num)
			qts_data->irq = qts_data->vendor_ops.get_irq_num(qts_data->vendor_data);

		atomic_set(&qts_data->delayed_tvm_probe_pending, 0);
	}

	rc = gh_irq_lend_v2(vm_info->irq_label, vm_info->vm_name,
		qts_data->irq, &qts_vm_irq_on_release_callback, qts_data);
	if (rc) {
		pr_err("Failed to lend irq\n");
		goto abort_handler;
	}

	pr_debug("vm irq lend success for irq:%d\n", qts_data->irq);
	qts_trusted_touch_set_vm_state(qts_data, PVM_IRQ_LENT);

	rc = gh_irq_lend_notify(vm_info->irq_label);
	if (rc) {
		pr_err("Failed to notify irq\n");
		goto abort_handler;
	}
	qts_trusted_touch_set_vm_state(qts_data, PVM_IRQ_LENT_NOTIFIED);

	if (qts_data->vendor_ops.post_la_tui_enable)
		qts_data->vendor_ops.post_la_tui_enable(qts_data->vendor_data);

	mutex_unlock(&qts_data->transition_lock);
	atomic_set(&qts_data->trusted_touch_transition, 0);
	atomic_set(&qts_data->trusted_touch_enabled, 1);
	pr_debug("trusted touch enabled\n");
	return rc;

abort_handler:
	qts_trusted_touch_abort_handler(qts_data, TRUSTED_TOUCH_EVENT_LEND_FAILURE);

error:
	mutex_unlock(&qts_data->transition_lock);
	return rc;
}

static int qts_handle_trusted_touch_pvm(struct qts_data *qts_data, int value)
{
	int err = 0;

	switch (value) {
	case 0:
		if (atomic_read(&qts_data->trusted_touch_enabled) == 0 &&
			(atomic_read(&qts_data->trusted_touch_abort_status) == 0)) {
			pr_err("Trusted touch is already disabled\n");
			break;
		}
		if (atomic_read(&qts_data->trusted_touch_mode) ==
				TRUSTED_TOUCH_VM_MODE) {
			qts_trusted_touch_pvm_vm_mode_disable(qts_data);
		} else {
			pr_err("Unsupported trusted touch mode\n");
		}
		break;

	case 1:
		if (atomic_read(&qts_data->trusted_touch_enabled)) {
			pr_err("Trusted touch usecase underway\n");
			err = -EBUSY;
			break;
		}
		if (atomic_read(&qts_data->trusted_touch_mode) ==
				TRUSTED_TOUCH_VM_MODE) {
			err = qts_trusted_touch_pvm_vm_mode_enable(qts_data);
		} else {
			pr_err("Unsupported trusted touch mode\n");
		}
		break;

	default:
		pr_err("unsupported value: %lu\n", value);
		err = -EINVAL;
		break;
	}
	return err;
}

#endif

static void qts_trusted_touch_event_notify(struct qts_data *qts_data, int event)
{
	atomic_set(&qts_data->trusted_touch_event, event);
	sysfs_notify(&qts_data->dev->kobj, NULL, "trusted_touch_event");
}

static void qts_trusted_touch_abort_handler(struct qts_data *qts_data, int error)
{
	atomic_set(&qts_data->trusted_touch_abort_status, error);
	pr_info("TUI session aborted with failure:%d\n", error);
	qts_trusted_touch_event_notify(qts_data, error);
#ifdef CONFIG_ARCH_QTI_VM
	pr_info("Resetting touch controller\n");
	if (qts_trusted_touch_get_vm_state(qts_data) >= TVM_IOMEM_ACCEPTED &&
			error == TRUSTED_TOUCH_EVENT_I2C_FAILURE) {
		pr_info("Resetting touch controller\n");
		qts_trusted_touch_reset_gpio_toggle(qts_data);
	}
#endif
}

static int qts_vm_init(struct qts_data *qts_data)
{
	int rc = 0;
	struct trusted_touch_vm_info *vm_info;
	void *mem_cookie;

	rc = qts_populate_vm_info(qts_data);
	if (rc) {
		pr_err("Cannot setup vm pipeline\n");
		rc = -EINVAL;
		goto fail;
	}

	vm_info = qts_data->vm_info;
#ifdef CONFIG_ARCH_QTI_VM
	mem_cookie = gh_mem_notifier_register(vm_info->mem_tag,
			qts_vm_mem_on_lend_handler, qts_data);
	if (!mem_cookie) {
		pr_err("Failed to register on lend mem notifier\n");
		rc = -EINVAL;
		goto init_fail;
	}
	vm_info->mem_cookie = mem_cookie;
	rc = gh_irq_wait_for_lend_v2(vm_info->irq_label, GH_PRIMARY_VM,
			&qts_vm_irq_on_lend_callback, qts_data);
	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_TVM_INIT);
#else
	mem_cookie = gh_mem_notifier_register(vm_info->mem_tag,
			qts_vm_mem_on_release_handler, qts_data);
	if (!mem_cookie) {
		pr_err("Failed to register on release mem notifier\n");
		rc = -EINVAL;
		goto init_fail;
	}
	vm_info->mem_cookie = mem_cookie;
	qts_trusted_touch_set_vm_state(qts_data, TRUSTED_TOUCH_PVM_INIT);
#endif
	return rc;
init_fail:
	qts_vm_deinit(qts_data);
fail:
	return rc;
}

static void qts_dt_parse_trusted_touch_info(struct qts_data *qts_data)
{
	struct device_node *np = qts_data->dev->of_node;
	int rc = 0;
	const char *selection;
	const char *environment;

	rc = of_property_read_string(np, "qts,trusted-touch-mode", &selection);
	if (rc) {
		pr_err("No trusted touch mode selection made\n");
		atomic_set(&qts_data->trusted_touch_mode,
						TRUSTED_TOUCH_MODE_NONE);
		return;
	}

	if (!strcmp(selection, "vm_mode")) {
		atomic_set(&qts_data->trusted_touch_mode,
						TRUSTED_TOUCH_VM_MODE);
		pr_debug("Selected trusted touch mode to VM mode\n");
	} else {
		atomic_set(&qts_data->trusted_touch_mode,
						TRUSTED_TOUCH_MODE_NONE);
		pr_err("Invalid trusted_touch mode\n");
	}

	rc = of_property_read_string(np, "qts,touch-environment",
						&environment);
	if (rc)
		pr_err("No trusted touch mode environment\n");

	qts_data->touch_environment = environment;
	qts_data->tui_supported = true;
	pr_debug("Trusted touch environment:%s\n", qts_data->touch_environment);
}

static void qts_trusted_touch_init(struct qts_data *qts_data)
{
	int rc = 0;

	atomic_set(&qts_data->trusted_touch_initialized, 0);
	qts_dt_parse_trusted_touch_info(qts_data);

	if (atomic_read(&qts_data->trusted_touch_mode) == TRUSTED_TOUCH_MODE_NONE)
		return;

	init_completion(&qts_data->trusted_touch_powerdown);

	/* Get clocks */
	qts_data->core_clk = devm_clk_get(qts_data->dev->parent, "m-ahb");

	if (IS_ERR(qts_data->core_clk)) {
		qts_data->core_clk = NULL;
		pr_err("core_clk is not defined\n");
	}

	qts_data->iface_clk = devm_clk_get(qts_data->dev->parent, "se-clk");

	if (IS_ERR(qts_data->iface_clk)) {
		qts_data->iface_clk = NULL;
		pr_err("iface_clk is not defined\n");
	}

	if (atomic_read(&qts_data->trusted_touch_mode) ==
						TRUSTED_TOUCH_VM_MODE) {
		rc = qts_vm_init(qts_data);
		if (rc)
			pr_err("Failed to init VM\n");
	}
	atomic_set(&qts_data->trusted_touch_initialized, 1);
}

static ssize_t trusted_touch_enable_show(struct kobject *kobj, struct kobj_attribute *attr,
				char *buf)
{
	struct qts_data *qts_data;

	qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];

	return scnprintf(buf, PAGE_SIZE, "%d",
			atomic_read(&qts_data->trusted_touch_enabled));
}

static ssize_t trusted_touch_enable_store(struct kobject *kobj, struct kobj_attribute *attr,
				const char *buf, size_t count)
{
	struct qts_data *qts_data;
	unsigned long value;
	int err = 0;

	if (count > 2)
		return -EINVAL;

	err = kstrtoul(buf, 10, &value);
	if (err != 0)
		return err;

	qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];

	if (!atomic_read(&qts_data->trusted_touch_initialized))
		return -EIO;

#ifdef CONFIG_ARCH_QTI_VM
	err = qts_handle_trusted_touch_tvm(qts_data, value);
	if (err) {
		pr_err("Failed to handle trusted touch in tvm\n");
		return -EINVAL;
	}
#else
	err = qts_handle_trusted_touch_pvm(qts_data, value);
	if (err) {
		pr_err("Failed to handle trusted touch in pvm\n");
		return -EINVAL;
	}
#endif
	err = count;
	return err;
}

static ssize_t trusted_touch_event_show(struct kobject *kobj, struct kobj_attribute *attr,
				char *buf)
{
	struct qts_data *qts_data;

	qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];

	return scnprintf(buf, PAGE_SIZE, "%d",
			atomic_read(&qts_data->trusted_touch_event));
}

static ssize_t trusted_touch_event_store(struct kobject *kobj, struct kobj_attribute *attr,
				const char *buf, size_t count)
{
	struct qts_data *qts_data;
	unsigned long value;
	int err = 0;

	if (count > 2)
		return -EINVAL;

	err = kstrtoul(buf, 10, &value);
	if (err != 0)
		return err;

	qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];

	if (!atomic_read(&qts_data->trusted_touch_initialized))
		return -EIO;

	if (value)
		return -EIO;

	atomic_set(&qts_data->trusted_touch_event, value);

	return count;
}

static ssize_t trusted_touch_type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
	struct qts_data *qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];

	return scnprintf(buf, PAGE_SIZE, "%s", qts_data->vm_info->trusted_touch_type);
}

static ssize_t trusted_touch_device_path_show(struct kobject *kobj,
			struct kobj_attribute *attr, char *buf)
{
	struct qts_data *qts_data = &qts_data_entries->info[QTS_CLIENT_PRIMARY_TOUCH];
	char *path = NULL;

	if (qts_data && qts_data->dev)
		path = kobject_get_path(&qts_data->dev->kobj, GFP_KERNEL);

	return scnprintf(buf, PAGE_SIZE, "%s", path ? path : "");
}

static struct kobj_attribute trusted_touch_enable_attr =
	__ATTR(trusted_touch_enable, 0664, trusted_touch_enable_show, trusted_touch_enable_store);

static struct kobj_attribute trusted_touch_event_attr =
	__ATTR(trusted_touch_event, 0664, trusted_touch_event_show, trusted_touch_event_store);

static struct kobj_attribute trusted_touch_type_attr =
	__ATTR(trusted_touch_type, 0664, trusted_touch_type_show, NULL);

static struct kobj_attribute trusted_touch_device_path_attr =
	__ATTR(trusted_touch_device_path, 0444, trusted_touch_device_path_show, NULL);

static struct attribute *qts_attributes[] = {
	&trusted_touch_enable_attr.attr,
	&trusted_touch_event_attr.attr,
	&trusted_touch_type_attr.attr,
	&trusted_touch_device_path_attr.attr,
	NULL,
};

static struct attribute_group qts_attribute_group = {
	.attrs = qts_attributes,
};

static int qts_create_sysfs(struct qts_data *qts_data)
{
	int ret = 0;
	struct kobject *qts_kobj;
	struct kobject *client_kobj;

	qts_kobj = &qts_data_entries->qts_kset->kobj;

	if (qts_data->client_type == QTS_CLIENT_PRIMARY_TOUCH) {

		client_kobj = kobject_create_and_add("primary", qts_kobj);
		if (!client_kobj) {
			pr_err("primary kobject_create_and_add failed\n");
			return -ENOMEM;
		}

		ret = sysfs_create_group(client_kobj, &qts_attribute_group);
		if (ret) {
			pr_err("[EX]: sysfs_create_group() failed!!\n");
			sysfs_remove_group(client_kobj, &qts_attribute_group);
			return -ENOMEM;
		}
	} else if (qts_data->client_type == QTS_CLIENT_SECONDARY_TOUCH) {

		client_kobj = kobject_create_and_add("secondary", qts_kobj);
		if (!client_kobj) {
			pr_err("secondary kobject_create_and_add failed\n");
			return -ENOMEM;
		}

		ret = sysfs_create_group(client_kobj, &qts_attribute_group);
		if (ret) {
			pr_err("[EX]: sysfs_create_group() failed!!\n");
			sysfs_remove_group(client_kobj, &qts_attribute_group);
			return -ENOMEM;
		}
	}

	pr_debug("sysfs_create_group() succeeded\n");
	return ret;
}

static int qts_ts_check_dt(struct device_node *np)
{
	int i;
	int count;
	struct device_node *node;
	struct drm_panel *panel;

	count = of_count_phandle_with_args(np, "panel", NULL);
	if (count <= 0)
		return 0;

	for (i = 0; i < count; i++) {
		node = of_parse_phandle(np, "panel", i);
		panel = of_drm_find_panel(node);
		of_node_put(node);
		if (!IS_ERR(panel)) {
			active_panel = panel;
			return 0;
		}
	}
	return PTR_ERR(panel);
}

static void qts_power_source_init(struct qts_data *qts_data)
{
	qts_data->vdd = regulator_get(qts_data->dev, "vdd");
	if (IS_ERR_OR_NULL(qts_data->vdd))
		pr_debug("get vdd regulator failed\n");

	qts_data->avdd = regulator_get(qts_data->dev, "avdd");
	if (IS_ERR_OR_NULL(qts_data->avdd))
		pr_debug("get avdd regulator failed\n");
}

#ifndef CONFIG_ARCH_QTI_VM
static int qts_enable_reg(struct qts_data *qts_data, bool enable)
{
	int ret = 0;

	if (IS_ERR_OR_NULL(qts_data->vdd)) {
		pr_err("vdd is invalid\n");
		return ret;
	}

	if (enable) {
		ret = regulator_enable(qts_data->vdd);
		if (ret) {
			pr_err("enable vdd regulator failed,ret=%d\n", ret);
			goto error;
		}

		if (!IS_ERR_OR_NULL(qts_data->avdd)) {
			ret = regulator_enable(qts_data->avdd);
			if (ret) {
				pr_err("enable avdd regulator failed,ret=%d\n", ret);
				goto error_avdd_en;
			}
		}
	} else {
		ret = regulator_disable(qts_data->vdd);
		if (ret)
			pr_err("disable vdd regulator failed,ret=%d\n", ret);

		if (!IS_ERR_OR_NULL(qts_data->avdd)) {
			ret = regulator_disable(qts_data->avdd);
			if (ret)
				pr_err("disable avdd regulator failed,ret=%d\n", ret);
		}
	}

	pr_debug("enable %d completed\n", enable);
	return ret;

error_avdd_en:
	(void)regulator_disable(qts_data->vdd);
error:
	return ret;
}

#endif

static void qts_ts_suspend(struct qts_data *qts_data)
{
	int rc = 0;

	if (qts_data->suspended) {
		pr_warn("already in suspend state\n");
		return;
	}

	if (qts_data->tui_supported) {
		if (atomic_read(&qts_data->trusted_touch_transition)
			|| atomic_read(&qts_data->trusted_touch_enabled))
			wait_for_completion_interruptible(&qts_data->trusted_touch_powerdown);
	}
	mutex_lock(&qts_data->transition_lock);

	rc = qts_data->vendor_ops.suspend(qts_data->vendor_data);
	if (rc)
		pr_err("suspend failed, rc = %d\n", rc);

	qts_data->suspended = true;
	mutex_unlock(&qts_data->transition_lock);
}

static void qts_ts_resume(struct qts_data *qts_data)
{
	int rc = 0;

	if (!qts_data->suspended) {
		pr_warn("Already in awake state\n");
		return;
	}

	if (qts_data->tui_supported)
		if (atomic_read(&qts_data->trusted_touch_transition))
			wait_for_completion_interruptible(&qts_data->trusted_touch_powerdown);

	mutex_lock(&qts_data->transition_lock);

	rc = qts_data->vendor_ops.resume(qts_data->vendor_data);
	if (rc)
		pr_err("resume failed, rc = %d\n", rc);

	qts_data->suspended = false;
	mutex_unlock(&qts_data->transition_lock);
}

static void qts_resume_work(struct work_struct *work)
{
	struct qts_data *qts_data = container_of(work, struct qts_data,
			resume_work);

	qts_ts_resume(qts_data);
}

static void qts_suspend_work(struct work_struct *work)
{
	struct qts_data *qts_data = container_of(work, struct qts_data,
			suspend_work);

	qts_ts_suspend(qts_data);
}

static void qts_panel_notifier_callback(enum panel_event_notifier_tag tag,
		struct panel_event_notification *notification, void *client_data)
{
	struct qts_data *qts_data = client_data;

	if (!notification) {
		pr_err("Invalid notification\n");
		return;
	}

	pr_debug("Notification type:%d, early_trigger:%d\n",
		notification->notif_type, notification->notif_data.early_trigger);

	switch (notification->notif_type) {
	case DRM_PANEL_EVENT_UNBLANK:
		if (notification->notif_data.early_trigger) {
			pr_debug("resume notification pre commit\n");
		} else {
			if (qts_data->schedule_resume)
				queue_work(qts_data->ts_workqueue, &qts_data->resume_work);
			else
				qts_ts_resume(qts_data);
		}
		break;
	case DRM_PANEL_EVENT_BLANK:
		if (notification->notif_data.early_trigger) {
			if (qts_data->schedule_resume)
				cancel_work_sync(&qts_data->resume_work);
			if (qts_data->schedule_suspend)
				queue_work(qts_data->ts_workqueue, &qts_data->suspend_work);
			else
				qts_ts_suspend(qts_data);
		} else {
			pr_debug("suspend notification post commit\n");
		}
		break;
	case DRM_PANEL_EVENT_BLANK_LP:
		pr_debug("received lp event\n");
		break;
	case DRM_PANEL_EVENT_FPS_CHANGE:
		pr_debug("Received fps change old fps:%d new fps:%d\n",
			notification->notif_data.old_fps,
			notification->notif_data.new_fps);
		break;
	default:
		pr_debug("notification serviced :%d\n",
			notification->notif_type);
		break;
	}
}

static void qts_ts_register_for_panel_events(struct qts_data *qts_data)
{
	void *cookie = NULL;

	if (qts_data->client_type != QTS_CLIENT_PRIMARY_TOUCH) {
		pr_err("Invalid touch type\n");
		return;
	}

	cookie = panel_event_notifier_register(PANEL_EVENT_NOTIFICATION_PRIMARY,
		PANEL_EVENT_NOTIFIER_CLIENT_PRIMARY_TOUCH, qts_data->panel,
		&qts_panel_notifier_callback, qts_data);
	if (!cookie) {
		pr_err("Failed to register for panel events\n");
		return;
	}

	pr_debug("registered for panel notifications panel: 0x%x\n", qts_data->panel);

	qts_data->notifier_cookie = cookie;
}

int qts_client_register(struct qts_vendor_data qts_vendor_data)
{
	struct qts_data *qts_data;
	struct device_node *dp;
	int rc = 0;

	if (!qts_data_entries) {
		pr_debug("QTS client register\n");
		qts_data_entries = kzalloc(sizeof(*qts_data_entries), GFP_KERNEL);
		if (!qts_data_entries) {
			pr_err("mem allocation failed\n");
			return -EPROBE_DEFER;
		}
		mutex_init(&qts_data_entries->qts_data_entries_lock);
		qts_data_entries->qts_kset = kset_create_and_add("qts", NULL, kernel_kobj);
		if (!qts_data_entries->qts_kset) {
			pr_err("qts kset create failed\n");
			return -ENOMEM;
		}
	}

	mutex_lock(&qts_data_entries->qts_data_entries_lock);

	if (qts_vendor_data.bus_type == QTS_BUS_TYPE_I2C)
		dp = qts_vendor_data.client->dev.of_node;
	else
		dp = qts_vendor_data.spi->dev.of_node;

	rc = qts_ts_check_dt(dp);
	if (rc) {
		pr_debug("qts_ts_check_dt failed, rc = %d\n", rc);
		goto qts_register_end;
	}

	pr_debug("QTS client register starts\n");
	qts_data = &qts_data_entries->info[qts_vendor_data.client_type];

	qts_data->client = qts_vendor_data.client;
	qts_data->spi = qts_vendor_data.spi;

	if (qts_vendor_data.bus_type == QTS_BUS_TYPE_I2C)
		qts_data->dev = &qts_data->client->dev;
	else
		qts_data->dev = &qts_data->spi->dev;

	qts_data->bus_type = qts_vendor_data.bus_type;
	qts_data->client_type = qts_vendor_data.client_type;
	qts_data->dp = dp;
	qts_data->vendor_data = qts_vendor_data.vendor_data;
	qts_data->panel = active_panel;
	qts_data->vendor_ops = qts_vendor_data.qts_vendor_ops;
	qts_data->schedule_suspend = qts_vendor_data.schedule_suspend;
	qts_data->schedule_resume = qts_vendor_data.schedule_resume;

	qts_trusted_touch_init(qts_data);

	mutex_init(&(qts_data->qts_clk_io_ctrl_mutex));
	if (qts_data->tui_supported)
		qts_create_sysfs(qts_data);

	mutex_init(&qts_data->transition_lock);

#ifdef CONFIG_ARCH_QTI_VM
	atomic_set(&qts_data->delayed_tvm_probe_pending, 1);
	goto qts_register_end;
#else
	atomic_set(&qts_data->delayed_pvm_probe_pending, 1);
#endif

	qts_power_source_init(qts_data);

	qts_data->ts_workqueue = create_singlethread_workqueue("qts_wq");
	if (!qts_data->ts_workqueue)
		pr_err("create qts workqueue fail\n");

	if (qts_data->ts_workqueue && qts_data->schedule_resume)
		INIT_WORK(&qts_data->resume_work, qts_resume_work);

	if (qts_data->ts_workqueue && qts_data->schedule_suspend)
		INIT_WORK(&qts_data->suspend_work, qts_suspend_work);

	qts_ts_register_for_panel_events(qts_data);

qts_register_end:
	pr_debug("client register end\n");
	mutex_unlock(&qts_data_entries->qts_data_entries_lock);
	return rc;
}
EXPORT_SYMBOL(qts_client_register);