video: omapdss: Add opa362 driver

opa362 is amplifier for video and can be connected to the tvout pads
of the OMAP3. It has one gpio control for enable/disable of the output
(high impedance).
Signed-off-by: NH. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: NMarek Belisko <marek@goldelico.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/omap2/displays-new/Kconfig

 menu "OMAP Display Device Drivers (new device model)"
         depends on OMAP2_DSS
 
+config DISPLAY_ENCODER_OPA362
+	tristate "OPA362 external analog amplifier"
+	help
+	  Driver for OPA362 external analog TV amplifier controlled
+	  through a GPIO.
+
 config DISPLAY_ENCODER_TFP410
         tristate "TFP410 DPI to DVI Encoder"
 	help

drivers/video/fbdev/omap2/displays-new/Makefile

+obj-$(CONFIG_DISPLAY_ENCODER_OPA362) += encoder-opa362.o
 obj-$(CONFIG_DISPLAY_ENCODER_TFP410) += encoder-tfp410.o
 obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o
 obj-$(CONFIG_DISPLAY_CONNECTOR_DVI) += connector-dvi.o

drivers/video/fbdev/omap2/displays-new/encoder-opa362.c

+/*
+ * OPA362 analog video amplifier with output/power control
+ *
+ * Copyright (C) 2014 Golden Delicious Computers
+ * Author: H. Nikolaus Schaller <hns@goldelico.com>
+ *
+ * based on encoder-tfp410
+ *
+ * Copyright (C) 2013 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of_gpio.h>
+
+#include <video/omapdss.h>
+
+struct panel_drv_data {
+	struct omap_dss_device dssdev;
+	struct omap_dss_device *in;
+
+	struct gpio_desc *enable_gpio;
+
+	struct omap_video_timings timings;
+};
+
+#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
+
+static int opa362_connect(struct omap_dss_device *dssdev,
+		struct omap_dss_device *dst)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+	int r;
+
+	dev_dbg(dssdev->dev, "connect\n");
+
+	if (omapdss_device_is_connected(dssdev))
+		return -EBUSY;
+
+	r = in->ops.atv->connect(in, dssdev);
+	if (r)
+		return r;
+
+	dst->src = dssdev;
+	dssdev->dst = dst;
+
+	return 0;
+}
+
+static void opa362_disconnect(struct omap_dss_device *dssdev,
+		struct omap_dss_device *dst)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+
+	dev_dbg(dssdev->dev, "disconnect\n");
+
+	WARN_ON(!omapdss_device_is_connected(dssdev));
+	if (!omapdss_device_is_connected(dssdev))
+		return;
+
+	WARN_ON(dst != dssdev->dst);
+	if (dst != dssdev->dst)
+		return;
+
+	dst->src = NULL;
+	dssdev->dst = NULL;
+
+	in->ops.atv->disconnect(in, &ddata->dssdev);
+}
+
+static int opa362_enable(struct omap_dss_device *dssdev)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+	int r;
+
+	dev_dbg(dssdev->dev, "enable\n");
+
+	if (!omapdss_device_is_connected(dssdev))
+		return -ENODEV;
+
+	if (omapdss_device_is_enabled(dssdev))
+		return 0;
+
+	in->ops.atv->set_timings(in, &ddata->timings);
+
+	r = in->ops.atv->enable(in);
+	if (r)
+		return r;
+
+	if (ddata->enable_gpio)
+		gpiod_set_value_cansleep(ddata->enable_gpio, 1);
+
+	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+	return 0;
+}
+
+static void opa362_disable(struct omap_dss_device *dssdev)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+
+	dev_dbg(dssdev->dev, "disable\n");
+
+	if (!omapdss_device_is_enabled(dssdev))
+		return;
+
+	if (ddata->enable_gpio)
+		gpiod_set_value_cansleep(ddata->enable_gpio, 0);
+
+	in->ops.atv->disable(in);
+
+	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void opa362_set_timings(struct omap_dss_device *dssdev,
+		struct omap_video_timings *timings)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+
+	dev_dbg(dssdev->dev, "set_timings\n");
+
+	ddata->timings = *timings;
+	dssdev->panel.timings = *timings;
+
+	in->ops.atv->set_timings(in, timings);
+}
+
+static void opa362_get_timings(struct omap_dss_device *dssdev,
+		struct omap_video_timings *timings)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+	dev_dbg(dssdev->dev, "get_timings\n");
+
+	*timings = ddata->timings;
+}
+
+static int opa362_check_timings(struct omap_dss_device *dssdev,
+		struct omap_video_timings *timings)
+{
+	struct panel_drv_data *ddata = to_panel_data(dssdev);
+	struct omap_dss_device *in = ddata->in;
+
+	dev_dbg(dssdev->dev, "check_timings\n");
+
+	return in->ops.atv->check_timings(in, timings);
+}
+
+static void opa362_set_type(struct omap_dss_device *dssdev,
+		enum omap_dss_venc_type type)
+{
+	/* we can only drive a COMPOSITE output */
+	WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
+
+}
+
+static const struct omapdss_atv_ops opa362_atv_ops = {
+	.connect	= opa362_connect,
+	.disconnect	= opa362_disconnect,
+
+	.enable		= opa362_enable,
+	.disable	= opa362_disable,
+
+	.check_timings	= opa362_check_timings,
+	.set_timings	= opa362_set_timings,
+	.get_timings	= opa362_get_timings,
+
+	.set_type	= opa362_set_type,
+};
+
+static int opa362_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct panel_drv_data *ddata;
+	struct omap_dss_device *dssdev, *in;
+	struct gpio_desc *gpio;
+	int r;
+
+	dev_dbg(&pdev->dev, "probe\n");
+
+	if (node == NULL) {
+		dev_err(&pdev->dev, "Unable to find device tree\n");
+		return -EINVAL;
+	}
+
+	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ddata);
+
+	gpio = devm_gpiod_get(&pdev->dev, "enable");
+	if (IS_ERR(gpio)) {
+		if (PTR_ERR(gpio) != -ENOENT)
+			return PTR_ERR(gpio);
+
+		gpio = NULL;
+	} else {
+		gpiod_direction_output(gpio, 0);
+	}
+
+	ddata->enable_gpio = gpio;
+
+	in = omapdss_of_find_source_for_first_ep(node);
+	if (IS_ERR(in)) {
+		dev_err(&pdev->dev, "failed to find video source\n");
+		return PTR_ERR(in);
+	}
+
+	ddata->in = in;
+
+	dssdev = &ddata->dssdev;
+	dssdev->ops.atv = &opa362_atv_ops;
+	dssdev->dev = &pdev->dev;
+	dssdev->type = OMAP_DISPLAY_TYPE_VENC;
+	dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
+	dssdev->owner = THIS_MODULE;
+
+	r = omapdss_register_output(dssdev);
+	if (r) {
+		dev_err(&pdev->dev, "Failed to register output\n");
+		goto err_reg;
+	}
+
+	return 0;
+err_reg:
+	omap_dss_put_device(ddata->in);
+	return r;
+}
+
+static int __exit opa362_remove(struct platform_device *pdev)
+{
+	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+	struct omap_dss_device *dssdev = &ddata->dssdev;
+	struct omap_dss_device *in = ddata->in;
+
+	omapdss_unregister_output(&ddata->dssdev);
+
+	WARN_ON(omapdss_device_is_enabled(dssdev));
+	if (omapdss_device_is_enabled(dssdev))
+		opa362_disable(dssdev);
+
+	WARN_ON(omapdss_device_is_connected(dssdev));
+	if (omapdss_device_is_connected(dssdev))
+		opa362_disconnect(dssdev, dssdev->dst);
+
+	omap_dss_put_device(in);
+
+	return 0;
+}
+
+static const struct of_device_id opa362_of_match[] = {
+	{ .compatible = "omapdss,ti,opa362", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, opa362_of_match);
+
+static struct platform_driver opa362_driver = {
+	.probe	= opa362_probe,
+	.remove	= __exit_p(opa362_remove),
+	.driver	= {
+		.name	= "amplifier-opa362",
+		.owner	= THIS_MODULE,
+		.of_match_table = opa362_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+
+module_platform_driver(opa362_driver);
+
+MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
+MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
+MODULE_LICENSE("GPL v2");