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: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 292 insertions, 0 deletions

diff --git a/drivers/video/fbdev/omap2/displays-new/Kconfig b/drivers/video/fbdev/omap2/displays-new/Kconfig
index e6cfc38160d3..574710141a61 100644
--- a/drivers/video/fbdev/omap2/displays-new/Kconfig
+++ b/drivers/video/fbdev/omap2/displays-new/Kconfig
@@ -1,6 +1,12 @@
 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
diff --git a/drivers/video/fbdev/omap2/displays-new/Makefile b/drivers/video/fbdev/omap2/displays-new/Makefile
index 0323a8a1c682..9aa176bfbf2e 100644
--- a/drivers/video/fbdev/omap2/displays-new/Makefile
+++ b/drivers/video/fbdev/omap2/displays-new/Makefile
@@ -1,3 +1,4 @@
+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
diff --git a/drivers/video/fbdev/omap2/displays-new/encoder-opa362.c b/drivers/video/fbdev/omap2/displays-new/encoder-opa362.c
new file mode 100644
index 000000000000..84a6b3367124
--- /dev/null
+++ b/drivers/video/fbdev/omap2/displays-new/encoder-opa362.c
@@ -0,0 +1,285 @@
+/*
+ * 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");