OMAPDSS: Add new TPD12S015 Encoder driver

Add TPD12S015 HDMI ESD protection and level shifter encoder driver which
uses the new DSS device model and DSS ops.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

3 files changed, 402 insertions, 0 deletions

diff --git a/drivers/video/omap2/displays-new/Kconfig b/drivers/video/omap2/displays-new/Kconfig
index 92c232498fcc..6e4af85cf182 100644
--- a/drivers/video/omap2/displays-new/Kconfig
+++ b/drivers/video/omap2/displays-new/Kconfig
@@ -6,4 +6,10 @@ config DISPLAY_ENCODER_TFP410
         help
           Driver for TFP410 DPI to DVI encoder.
 
+config DISPLAY_ENCODER_TPD12S015
+        tristate "TPD12S015 HDMI ESD protection and level shifter"
+        help
+          Driver for TPD12S015, which offers HDMI ESD protection and level
+          shifting.
+
 endmenu
diff --git a/drivers/video/omap2/displays-new/Makefile b/drivers/video/omap2/displays-new/Makefile
index b0d34572ec7c..c2ee45e2e2c3 100644
--- a/drivers/video/omap2/displays-new/Makefile
+++ b/drivers/video/omap2/displays-new/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_DISPLAY_ENCODER_TFP410) += encoder-tfp410.o
+obj-$(CONFIG_DISPLAY_ENCODER_TPD12S015) += encoder-tpd12s015.o
diff --git a/drivers/video/omap2/displays-new/encoder-tpd12s015.c b/drivers/video/omap2/displays-new/encoder-tpd12s015.c
new file mode 100644
index 000000000000..ce0e010026cb
--- /dev/null
+++ b/drivers/video/omap2/displays-new/encoder-tpd12s015.c
@@ -0,0 +1,395 @@
+/*
+ * TPD12S015 HDMI ESD protection & level shifter chip driver
+ *
+ * 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/completion.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+
+#include <video/omapdss.h>
+#include <video/omap-panel-data.h>
+
+struct panel_drv_data {
+        struct omap_dss_device dssdev;
+        struct omap_dss_device *in;
+
+        int ct_cp_hpd_gpio;
+        int ls_oe_gpio;
+        int hpd_gpio;
+
+        struct omap_video_timings timings;
+
+        struct completion hpd_completion;
+};
+
+#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
+
+static irqreturn_t tpd_hpd_irq_handler(int irq, void *data)
+{
+        struct panel_drv_data *ddata = data;
+        bool hpd;
+
+        hpd = gpio_get_value_cansleep(ddata->hpd_gpio);
+
+        dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd);
+
+        if (gpio_is_valid(ddata->ls_oe_gpio)) {
+                if (hpd)
+                        gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
+                else
+                        gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
+        }
+
+        complete_all(&ddata->hpd_completion);
+
+        return IRQ_HANDLED;
+}
+
+static int tpd_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;
+
+        r = in->ops.hdmi->connect(in, dssdev);
+        if (r)
+                return r;
+
+        dst->output = dssdev;
+        dssdev->device = dst;
+
+        INIT_COMPLETION(ddata->hpd_completion);
+
+        gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
+        /* DC-DC converter needs at max 300us to get to 90% of 5V */
+        udelay(300);
+
+        /*
+         * If there's a cable connected, wait for the hpd irq to trigger,
+         * which turns on the level shifters.
+         */
+        if (gpio_get_value_cansleep(ddata->hpd_gpio)) {
+                unsigned long to;
+                to = wait_for_completion_timeout(&ddata->hpd_completion,
+                                msecs_to_jiffies(250));
+                WARN_ON_ONCE(to == 0);
+        }
+
+        return 0;
+}
+
+static void tpd_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;
+
+        WARN_ON(dst != dssdev->device);
+
+        if (dst != dssdev->device)
+                return;
+
+        gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
+
+        dst->output = NULL;
+        dssdev->device = NULL;
+
+        in->ops.hdmi->disconnect(in, &ddata->dssdev);
+}
+
+static int tpd_enable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+        int r;
+
+        if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
+                return 0;
+
+        in->ops.hdmi->set_timings(in, &ddata->timings);
+
+        r = in->ops.hdmi->enable(in);
+        if (r)
+                return r;
+
+        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+        return r;
+}
+
+static void tpd_disable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+                return;
+
+        in->ops.hdmi->disable(in);
+
+        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void tpd_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;
+
+        ddata->timings = *timings;
+        dssdev->panel.timings = *timings;
+
+        in->ops.hdmi->set_timings(in, timings);
+}
+
+static void tpd_get_timings(struct omap_dss_device *dssdev,
+                struct omap_video_timings *timings)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+        *timings = ddata->timings;
+}
+
+static int tpd_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;
+        int r;
+
+        r = in->ops.hdmi->check_timings(in, timings);
+
+        return r;
+}
+
+static int tpd_read_edid(struct omap_dss_device *dssdev,
+                u8 *edid, int len)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        if (!gpio_get_value_cansleep(ddata->hpd_gpio))
+                return -ENODEV;
+
+        return in->ops.hdmi->read_edid(in, edid, len);
+}
+
+static bool tpd_detect(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+        return gpio_get_value_cansleep(ddata->hpd_gpio);
+}
+
+static int tpd_audio_enable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        return in->ops.hdmi->audio_enable(in);
+}
+
+static void tpd_audio_disable(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        in->ops.hdmi->audio_disable(in);
+}
+
+static int tpd_audio_start(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        return in->ops.hdmi->audio_start(in);
+}
+
+static void tpd_audio_stop(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        in->ops.hdmi->audio_stop(in);
+}
+
+static bool tpd_audio_supported(struct omap_dss_device *dssdev)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        return in->ops.hdmi->audio_supported(in);
+}
+
+static int tpd_audio_config(struct omap_dss_device *dssdev,
+                struct omap_dss_audio *audio)
+{
+        struct panel_drv_data *ddata = to_panel_data(dssdev);
+        struct omap_dss_device *in = ddata->in;
+
+        return in->ops.hdmi->audio_config(in, audio);
+}
+
+static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
+        .connect                = tpd_connect,
+        .disconnect             = tpd_disconnect,
+
+        .enable                 = tpd_enable,
+        .disable                = tpd_disable,
+
+        .check_timings          = tpd_check_timings,
+        .set_timings            = tpd_set_timings,
+        .get_timings            = tpd_get_timings,
+
+        .read_edid              = tpd_read_edid,
+        .detect                 = tpd_detect,
+
+        .audio_enable           = tpd_audio_enable,
+        .audio_disable          = tpd_audio_disable,
+        .audio_start            = tpd_audio_start,
+        .audio_stop             = tpd_audio_stop,
+        .audio_supported        = tpd_audio_supported,
+        .audio_config           = tpd_audio_config,
+};
+
+static int tpd_probe_pdata(struct platform_device *pdev)
+{
+        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+        struct encoder_tpd12s015_platform_data *pdata;
+        struct omap_dss_device *dssdev, *in;
+
+        pdata = dev_get_platdata(&pdev->dev);
+
+        ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
+        ddata->ls_oe_gpio = pdata->ls_oe_gpio;
+        ddata->hpd_gpio = pdata->hpd_gpio;
+
+        in = omap_dss_find_output(pdata->source);
+        if (in == NULL) {
+                dev_err(&pdev->dev, "Failed to find video source\n");
+                return -ENODEV;
+        }
+
+        ddata->in = in;
+
+        dssdev = &ddata->dssdev;
+        dssdev->name = pdata->name;
+
+        return 0;
+}
+
+static int tpd_probe(struct platform_device *pdev)
+{
+        struct omap_dss_device *in, *dssdev;
+        struct panel_drv_data *ddata;
+        int r;
+
+        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+        if (!ddata)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, ddata);
+
+        init_completion(&ddata->hpd_completion);
+
+        if (dev_get_platdata(&pdev->dev)) {
+                r = tpd_probe_pdata(pdev);
+                if (r)
+                        return r;
+        } else {
+                return -ENODEV;
+        }
+
+        r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
+                        GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
+        if (r)
+                goto err_gpio;
+
+        if (gpio_is_valid(ddata->ls_oe_gpio)) {
+                r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
+                                GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
+                if (r)
+                        goto err_gpio;
+        }
+
+        r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
+                        GPIOF_DIR_IN, "hdmi_hpd");
+        if (r)
+                goto err_gpio;
+
+        r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio),
+                                 NULL, tpd_hpd_irq_handler,
+                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                                 IRQF_ONESHOT, "hpd", ddata);
+        if (r)
+                goto err_irq;
+
+        dssdev = &ddata->dssdev;
+        dssdev->ops.hdmi = &tpd_hdmi_ops;
+        dssdev->dev = &pdev->dev;
+        dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
+        dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
+        dssdev->owner = THIS_MODULE;
+
+        in = ddata->in;
+
+        r = omapdss_register_output(dssdev);
+        if (r) {
+                dev_err(&pdev->dev, "Failed to register output\n");
+                goto err_reg;
+        }
+
+        return 0;
+err_reg:
+err_irq:
+err_gpio:
+        omap_dss_put_device(ddata->in);
+        return r;
+}
+
+static int __exit tpd_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))
+                tpd_disable(dssdev);
+
+        WARN_ON(omapdss_device_is_connected(dssdev));
+        if (omapdss_device_is_connected(dssdev))
+                tpd_disconnect(dssdev, dssdev->device);
+
+        omap_dss_put_device(in);
+
+        return 0;
+}
+
+static struct platform_driver tpd_driver = {
+        .probe  = tpd_probe,
+        .remove = __exit_p(tpd_remove),
+        .driver = {
+                .name   = "tpd12s015",
+                .owner  = THIS_MODULE,
+        },
+};
+
+module_platform_driver(tpd_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("TPD12S015 driver");
+MODULE_LICENSE("GPL");