NFC: driver: Fix compilation issues on NFC driver

Modified code to fix compilation issues on NFC driver
for MW version 12.10.00 and retained QC specific code.

Change-Id: I9eeba3f6534a3c67c3b32b6361b4ef5d42965265

nfc/common_qcom.c

@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ *
+ ***************************************************************************/
+/*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ *
+ ***************************************************************************/
+
+#include "common.h"
+
+/*
+ * Inside nfc_ioctl_nfcc_info
+ *
+ * @brief   nfc_ioctl_nfcc_info
+ *
+ * Check the NFC Chipset and firmware version details
+ */
+unsigned int nfc_ioctl_nfcc_info(struct file *filp, unsigned long arg)
+{
+	unsigned int r = 0;
+	struct nfc_dev *nfc_dev = filp->private_data;
+
+	r = nfc_dev->nqx_info.i;
+	pr_debug("nfc : %s r = 0x%x\n", __func__, r);
+
+	return r;
+}
+
+/*
+ * Inside is_nfc_data_available_for_read
+ *
+ * @nfc_dev: nfc device data structure
+ *
+ * Checks if the data is available for reading
+ * on waiting queue.
+ *
+ * @Return: status value
+ *
+ */
+int is_nfc_data_available_for_read(struct nfc_dev *nfc_dev)
+{
+	int ret;
+
+	nfc_dev->nfc_enable_intr(nfc_dev);
+
+	ret = wait_event_interruptible_timeout(nfc_dev->read_wq,
+			!nfc_dev->i2c_dev.irq_enabled,
+			msecs_to_jiffies(MAX_IRQ_WAIT_TIME));
+	return ret;
+}
+
+/**
+ * nfc_ldo_vote()
+ * @nfc_dev: NFC device containing regulator handle
+ *
+ * LDO voting based on voltage and current entries in DT
+ *
+ * Return: 0 on success and -ve on failure
+ */
+int nfc_ldo_vote(struct nfc_dev *nfc_dev)
+{
+	int ret;
+
+	ret =  regulator_set_voltage(nfc_dev->reg,
+			nfc_dev->configs.ldo.vdd_levels[0],
+			nfc_dev->configs.ldo.vdd_levels[1]);
+	if (ret < 0) {
+		pr_err("%s: set voltage failed\n", __func__);
+		return ret;
+	}
+
+	/* pass expected current from NFC in uA */
+	ret = regulator_set_load(nfc_dev->reg, nfc_dev->configs.ldo.max_current);
+	if (ret < 0) {
+		pr_err("%s: set load failed\n", __func__);
+		return ret;
+	}
+
+	ret = regulator_enable(nfc_dev->reg);
+	if (ret < 0)
+		pr_err("%s: regulator_enable failed\n", __func__);
+	else
+		nfc_dev->is_vreg_enabled = true;
+	return ret;
+}
+
+/**
+ * nfc_ldo_config()
+ * @dev: device instance to read DT entry
+ * @nfc_dev: NFC device containing regulator handle
+ *
+ * Configure LDO if entry is present in DT file otherwise
+ * return with success as it's optional
+ *
+ * Return: 0 on success and -ve on failure
+ */
+int nfc_ldo_config(struct device *dev, struct nfc_dev *nfc_dev)
+{
+	int ret;
+
+	if (of_get_property(dev->of_node, NFC_LDO_SUPPLY_NAME, NULL)) {
+		// Get the regulator handle
+		nfc_dev->reg = regulator_get(dev, NFC_LDO_SUPPLY_DT_NAME);
+		if (IS_ERR(nfc_dev->reg)) {
+			ret = PTR_ERR(nfc_dev->reg);
+			nfc_dev->reg = NULL;
+			pr_err("%s: regulator_get failed, ret = %d\n",
+				__func__, ret);
+			return ret;
+		}
+	} else {
+		nfc_dev->reg = NULL;
+		pr_err("%s: regulator entry not present\n", __func__);
+		// return success as it's optional to configure LDO
+		return 0;
+	}
+
+	// LDO config supported by platform DT
+	ret = nfc_ldo_vote(nfc_dev);
+	if (ret < 0) {
+		pr_err("%s: LDO voting failed, ret = %d\n", __func__, ret);
+		regulator_put(nfc_dev->reg);
+	}
+	return ret;
+}
+
+/**
+ * nfc_ldo_unvote()
+ * @nfc_dev: NFC device containing regulator handle
+ *
+ * set voltage and load to zero and disable regulator
+ *
+ * Return: 0 on success and -ve on failure
+ */
+int nfc_ldo_unvote(struct nfc_dev *nfc_dev)
+{
+	int ret;
+
+	if (!nfc_dev->is_vreg_enabled) {
+		pr_err("%s: regulator already disabled\n", __func__);
+		return -EINVAL;
+	}
+
+	ret = regulator_disable(nfc_dev->reg);
+	if (ret < 0) {
+		pr_err("%s: regulator_disable failed\n", __func__);
+		return ret;
+	}
+	nfc_dev->is_vreg_enabled = false;
+
+	ret =  regulator_set_voltage(nfc_dev->reg, 0, NFC_VDDIO_MAX);
+	if (ret < 0) {
+		pr_err("%s: set voltage failed\n", __func__);
+		return ret;
+	}
+
+	ret = regulator_set_load(nfc_dev->reg, 0);
+	if (ret < 0)
+		pr_err("%s: set load failed\n", __func__);
+	return ret;
+}