[PATCH v3 22/32] drm/via: Add via_sii164.c

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From: Kevin Brace <kevinbrace@xxxxxxxxxxxxxxxxxxxx>

Signed-off-by: Kevin Brace <kevinbrace@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/via/via_sii164.c | 578 +++++++++++++++++++++++++++++++
 1 file changed, 578 insertions(+)
 create mode 100644 drivers/gpu/drm/via/via_sii164.c

diff --git a/drivers/gpu/drm/via/via_sii164.c b/drivers/gpu/drm/via/via_sii164.c
new file mode 100644
index 000000000000..05a4c0230fd7
--- /dev/null
+++ b/drivers/gpu/drm/via/via_sii164.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright © 2016-2018 Kevin Brace.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author(s):
+ * Kevin Brace <kevinbrace@xxxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <linux/pci.h>
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "via_drv.h"
+
+
+#define SII164_VEN		BIT(5)
+#define SII164_HEN		BIT(4)
+#define SII164_DSEL		BIT(3)
+#define SII164_BSEL		BIT(2)
+#define SII164_EDGE		BIT(1)
+#define SII164_PDB		BIT(0)
+
+
+static void via_sii164_power(struct i2c_adapter *i2c_bus, bool power_state)
+{
+	u8 buf;
+	u8 power_bit;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	via_i2c_readbytes(i2c_bus, 0x38, 0x08, &buf, 1);
+	power_bit = power_state ? SII164_PDB : 0x00;
+	buf &= ~power_bit;
+	buf |= power_bit;
+	via_i2c_writebytes(i2c_bus, 0x38, 0x08, &buf, 1);
+	DRM_DEBUG_KMS("SiI 164 (DVI) Power: %s\n",
+			power_state ? "On" : "Off");
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+
+static bool via_sii164_sense(struct i2c_adapter *i2c_bus)
+{
+	u8 buf;
+	bool rx_detected = false;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	via_i2c_readbytes(i2c_bus, 0x38, 0x09, &buf, 1);
+	if (buf & BIT(2)) {
+		rx_detected = true;
+	}
+
+	DRM_DEBUG_KMS("SiI 164 (DVI) Connector Sense: %s\n",
+			rx_detected ? "Connected" : "Not Connected");
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return rx_detected;
+}
+
+static void via_sii164_display_registers(struct i2c_adapter *i2c_bus)
+{
+	uint8_t i;
+	u8 buf;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	DRM_DEBUG_KMS("SiI 164 Registers:\n");
+	for (i = 0; i < 0x10; i++) {
+		via_i2c_readbytes(i2c_bus, 0x38, i, &buf, 1);
+		DRM_DEBUG_KMS("0x%02x: 0x%02x\n", i, buf);
+	}
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_sii164_init_registers(struct i2c_adapter *i2c_bus)
+{
+	u8 buf;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	buf = SII164_VEN | SII164_HEN |
+		SII164_DSEL |
+		SII164_EDGE | SII164_PDB;
+	via_i2c_writebytes(i2c_bus, 0x38, 0x08, &buf, 1);
+
+	/*
+	 * Route receiver detect bit (Offset 0x09[2]) as the output
+	 * of MSEN pin.
+	 */
+	buf = BIT(5);
+	via_i2c_writebytes(i2c_bus, 0x38, 0x09, &buf, 1);
+
+	buf = 0x90;
+	via_i2c_writebytes(i2c_bus, 0x38, 0x0a, &buf, 1);
+
+	buf = 0x89;
+	via_i2c_writebytes(i2c_bus, 0x38, 0x0c, &buf, 1);
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+
+static const struct drm_encoder_funcs via_sii164_drm_encoder_funcs = {
+	.destroy = via_encoder_cleanup,
+};
+
+static void via_sii164_dpms(struct drm_encoder *encoder, int mode)
+{
+	struct via_encoder *enc = container_of(encoder,
+					struct via_encoder, base);
+	struct drm_device *dev = encoder->dev;
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+	struct i2c_adapter *i2c_bus;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (enc->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (enc->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (enc->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (enc->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (enc->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	via_sii164_display_registers(i2c_bus);
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+		via_sii164_power(i2c_bus, true);
+		via_transmitter_io_pad_state(dev_priv, enc->di_port, true);
+		break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
+	case DRM_MODE_DPMS_OFF:
+		via_sii164_power(i2c_bus, false);
+		via_transmitter_io_pad_state(dev_priv, enc->di_port, false);
+		break;
+	default:
+		DRM_ERROR("Bad DPMS mode.");
+		break;
+	}
+
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static bool via_sii164_mode_fixup(struct drm_encoder *encoder,
+				const struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode)
+{
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	drm_mode_set_crtcinfo(adjusted_mode, 0);
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return true;
+}
+
+static void via_sii164_mode_set(struct drm_encoder *encoder,
+				struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode)
+{
+	struct via_crtc *iga = container_of(encoder->crtc, struct via_crtc, base);
+	struct via_encoder *enc = container_of(encoder,
+					struct via_encoder, base);
+	struct drm_device *dev = encoder->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+	struct i2c_adapter *i2c_bus;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (enc->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (enc->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (enc->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (enc->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (enc->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	via_transmitter_clock_drive_strength(dev_priv, enc->di_port, 0x03);
+	via_transmitter_data_drive_strength(dev_priv, enc->di_port, 0x03);
+	via_transmitter_io_pad_state(dev_priv, enc->di_port, true);
+	if (pdev->device == PCI_DEVICE_ID_VIA_CLE266_GFX) {
+		via_clock_source(dev_priv, enc->di_port, true);
+	}
+
+	via_sii164_display_registers(i2c_bus);
+	via_sii164_init_registers(i2c_bus);
+	via_sii164_display_registers(i2c_bus);
+
+	via_transmitter_display_source(dev_priv, enc->di_port, iga->index);
+exit:
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_sii164_prepare(struct drm_encoder *encoder)
+{
+	struct via_encoder *enc = container_of(encoder,
+					struct via_encoder, base);
+	struct drm_device *dev = encoder->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+	struct i2c_adapter *i2c_bus;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (enc->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (enc->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (enc->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (enc->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (enc->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	via_sii164_power(i2c_bus, false);
+	via_transmitter_io_pad_state(dev_priv, enc->di_port, false);
+	if (pdev->device == PCI_DEVICE_ID_VIA_CLE266_GFX) {
+		via_output_enable(dev_priv, enc->di_port, false);
+	}
+
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_sii164_commit(struct drm_encoder *encoder)
+{
+	struct via_encoder *enc = container_of(encoder,
+					struct via_encoder, base);
+	struct drm_device *dev = encoder->dev;
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+	struct i2c_adapter *i2c_bus;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (enc->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (enc->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (enc->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (enc->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (enc->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	via_sii164_power(i2c_bus, true);
+	via_transmitter_io_pad_state(dev_priv, enc->di_port, true);
+	if (pdev->device == PCI_DEVICE_ID_VIA_CLE266_GFX) {
+		via_output_enable(dev_priv, enc->di_port, true);
+	}
+
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static void via_sii164_disable(struct drm_encoder *encoder)
+{
+	struct via_encoder *enc = container_of(encoder,
+					struct via_encoder, base);
+	struct drm_device *dev = encoder->dev;
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+	struct i2c_adapter *i2c_bus;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (enc->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (enc->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (enc->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (enc->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (enc->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	via_sii164_power(i2c_bus, false);
+	via_transmitter_io_pad_state(dev_priv, enc->di_port, false);
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+
+static const struct drm_encoder_helper_funcs
+via_sii164_drm_encoder_helper_funcs = {
+	.dpms = via_sii164_dpms,
+	.mode_fixup = via_sii164_mode_fixup,
+	.mode_set = via_sii164_mode_set,
+	.prepare = via_sii164_prepare,
+	.commit = via_sii164_commit,
+	.disable = via_sii164_disable,
+};
+
+
+static enum drm_connector_status via_sii164_detect(
+					struct drm_connector *connector,
+					bool force)
+{
+	struct via_connector *con = container_of(connector,
+					struct via_connector, base);
+	struct i2c_adapter *i2c_bus;
+	enum drm_connector_status ret = connector_status_disconnected;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (con->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (con->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (con->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (con->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (con->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	if (via_sii164_sense(i2c_bus)) {
+		ret = connector_status_connected;
+		DRM_DEBUG_KMS("DVI detected.\n");
+	}
+
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return ret;
+}
+
+static const struct drm_connector_funcs via_sii164_drm_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.detect = via_sii164_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = via_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state =
+			drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state =
+			drm_atomic_helper_connector_destroy_state,
+};
+
+
+int via_sii164_mode_valid(struct drm_connector *connector,
+					struct drm_display_mode *mode)
+{
+	struct via_connector *con = container_of(connector,
+					struct via_connector, base);
+	struct i2c_adapter *i2c_bus;
+	u8 buf;
+	uint32_t low_freq_limit, high_freq_limit;
+	int ret;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (con->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (con->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (con->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (con->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (con->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		ret = MODE_ERROR;
+		goto exit;
+	}
+
+	via_i2c_readbytes(i2c_bus, 0x38, 0x06, &buf, 1);
+	low_freq_limit = buf * 1000;
+	via_i2c_readbytes(i2c_bus, 0x38, 0x07, &buf, 1);
+	high_freq_limit = (buf + 65) * 1000;
+	DRM_DEBUG_KMS("Low Frequency Limit: %u KHz\n", low_freq_limit);
+	DRM_DEBUG_KMS("High Frequency Limit: %u KHz\n", high_freq_limit);
+
+	if (mode->clock < low_freq_limit) {
+		ret = MODE_CLOCK_LOW;
+		goto exit;
+	}
+
+	if (mode->clock > high_freq_limit) {
+		ret = MODE_CLOCK_HIGH;
+		goto exit;
+	}
+
+	ret = MODE_OK;
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return ret;
+}
+
+static int via_sii164_get_modes(struct drm_connector *connector)
+{
+	struct via_connector *con = container_of(connector,
+					struct via_connector, base);
+	int count = 0;
+	struct i2c_adapter *i2c_bus;
+	struct edid *edid = NULL;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (con->i2c_bus & VIA_I2C_BUS1) {
+		i2c_bus = via_find_ddc_bus(0x26);
+	} else if (con->i2c_bus & VIA_I2C_BUS2) {
+		i2c_bus = via_find_ddc_bus(0x31);
+	} else if (con->i2c_bus & VIA_I2C_BUS3) {
+		i2c_bus = via_find_ddc_bus(0x25);
+	} else if (con->i2c_bus & VIA_I2C_BUS4) {
+		i2c_bus = via_find_ddc_bus(0x2c);
+	} else if (con->i2c_bus & VIA_I2C_BUS5) {
+		i2c_bus = via_find_ddc_bus(0x3d);
+	} else {
+		i2c_bus = NULL;
+		goto exit;
+	}
+
+	edid = drm_get_edid(&con->base, i2c_bus);
+	if (edid) {
+		if (edid->input & DRM_EDID_INPUT_DIGITAL) {
+			drm_connector_update_edid_property(connector, edid);
+			count = drm_add_edid_modes(connector, edid);
+			DRM_DEBUG_KMS("DVI EDID information was obtained.\n");
+		}
+
+		kfree(edid);
+	}
+
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return count;
+}
+
+static const struct drm_connector_helper_funcs
+via_sii164_drm_connector_helper_funcs = {
+	.mode_valid = via_sii164_mode_valid,
+	.get_modes = via_sii164_get_modes,
+};
+
+bool via_sii164_probe(struct i2c_adapter *i2c_bus)
+{
+	u8 buf;
+	u16 vendor_id, device_id, revision;
+	bool device_detected = false;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	via_i2c_readbytes(i2c_bus, 0x38, 0x00, &buf, 1);
+	vendor_id = buf;
+	via_i2c_readbytes(i2c_bus, 0x38, 0x01, &buf, 1);
+	vendor_id |= (buf << 8);
+	DRM_DEBUG_KMS("Vendor ID: %x\n", vendor_id);
+	via_i2c_readbytes(i2c_bus, 0x38, 0x02, &buf, 1);
+	device_id = buf;
+	via_i2c_readbytes(i2c_bus, 0x38, 0x03, &buf, 1);
+	device_id |= (buf << 8);
+	DRM_DEBUG_KMS("Device ID: %x\n", device_id);
+	via_i2c_readbytes(i2c_bus, 0x38, 0x04, &buf, 1);
+	revision = buf;
+	DRM_DEBUG_KMS("Revision: %x\n", revision);
+
+	if ((vendor_id != 0x0001) || (device_id != 0x0006)) {
+		goto exit;
+	}
+
+	device_detected = true;
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return device_detected;
+}
+
+void via_sii164_init(struct drm_device *dev)
+{
+	struct via_connector *con;
+	struct via_encoder *enc;
+	struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (!dev_priv->ext_tmds_presence) {
+		goto exit;
+	}
+
+	enc = kzalloc(sizeof(*enc) + sizeof(*con), GFP_KERNEL);
+	if (!enc) {
+		DRM_ERROR("Failed to allocate connector "
+				"and encoder.\n");
+		goto exit;
+	}
+
+	drm_encoder_init(dev, &enc->base, &via_sii164_drm_encoder_funcs,
+						DRM_MODE_ENCODER_TMDS, NULL);
+	drm_encoder_helper_add(&enc->base,
+					&via_sii164_drm_encoder_helper_funcs);
+
+	enc->base.possible_crtcs = BIT(1) | BIT(0);
+	enc->base.possible_clones = 0;
+
+	enc->i2c_bus = dev_priv->ext_tmds_i2c_bus;
+	enc->di_port = dev_priv->ext_tmds_di_port;
+
+	/* Increment the number of DVI connectors. */
+	dev_priv->number_dvi++;
+
+
+	con = &enc->cons[0];
+
+	drm_connector_init(dev, &con->base, &via_sii164_drm_connector_funcs,
+				DRM_MODE_CONNECTOR_DVID);
+	drm_connector_helper_add(&con->base,
+				&via_sii164_drm_connector_helper_funcs);
+	drm_connector_register(&con->base);
+
+	con->base.doublescan_allowed = false;
+	con->base.interlace_allowed = false;
+
+	con->i2c_bus = dev_priv->ext_tmds_i2c_bus;
+
+	INIT_LIST_HEAD(&con->props);
+	drm_connector_attach_encoder(&con->base, &enc->base);
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
--
2.35.1





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