1 files changed, 419 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c b/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c
new file mode 100644
index 000000000000..58d487ba2414
--- /dev/null
+++ b/drivers/gpu/drm/tilcdc/tilcdc_tfp410.c
@@ -0,0 +1,419 @@
+/*
+ * Copyright (C) 2012 Texas Instruments
+ * Author: Rob Clark <robdclark@gmail.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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/i2c.h>
+#include <linux/of_i2c.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/consumer.h>
+
+#include "tilcdc_drv.h"
+
+struct tfp410_module {
+        struct tilcdc_module base;
+        struct i2c_adapter *i2c;
+        int gpio;
+};
+#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
+
+
+static const struct tilcdc_panel_info dvi_info = {
+                .ac_bias                = 255,
+                .ac_bias_intrpt         = 0,
+                .dma_burst_sz           = 16,
+                .bpp                    = 16,
+                .fdd                    = 0x80,
+                .tft_alt_mode           = 0,
+                .sync_edge              = 0,
+                .sync_ctrl              = 1,
+                .raster_order           = 0,
+};
+
+/*
+ * Encoder:
+ */
+
+struct tfp410_encoder {
+        struct drm_encoder base;
+        struct tfp410_module *mod;
+        int dpms;
+};
+#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
+
+
+static void tfp410_encoder_destroy(struct drm_encoder *encoder)
+{
+        struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
+        drm_encoder_cleanup(encoder);
+        kfree(tfp410_encoder);
+}
+
+static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+        struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
+
+        if (tfp410_encoder->dpms == mode)
+                return;
+
+        if (mode == DRM_MODE_DPMS_ON) {
+                DBG("Power on");
+                gpio_direction_output(tfp410_encoder->mod->gpio, 1);
+        } else {
+                DBG("Power off");
+                gpio_direction_output(tfp410_encoder->mod->gpio, 0);
+        }
+
+        tfp410_encoder->dpms = mode;
+}
+
+static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
+                const struct drm_display_mode *mode,
+                struct drm_display_mode *adjusted_mode)
+{
+        /* nothing needed */
+        return true;
+}
+
+static void tfp410_encoder_prepare(struct drm_encoder *encoder)
+{
+        tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+        tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
+}
+
+static void tfp410_encoder_commit(struct drm_encoder *encoder)
+{
+        tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
+                struct drm_display_mode *mode,
+                struct drm_display_mode *adjusted_mode)
+{
+        /* nothing needed */
+}
+
+static const struct drm_encoder_funcs tfp410_encoder_funcs = {
+                .destroy        = tfp410_encoder_destroy,
+};
+
+static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
+                .dpms           = tfp410_encoder_dpms,
+                .mode_fixup     = tfp410_encoder_mode_fixup,
+                .prepare        = tfp410_encoder_prepare,
+                .commit         = tfp410_encoder_commit,
+                .mode_set       = tfp410_encoder_mode_set,
+};
+
+static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
+                struct tfp410_module *mod)
+{
+        struct tfp410_encoder *tfp410_encoder;
+        struct drm_encoder *encoder;
+        int ret;
+
+        tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
+        if (!tfp410_encoder) {
+                dev_err(dev->dev, "allocation failed\n");
+                return NULL;
+        }
+
+        tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
+        tfp410_encoder->mod = mod;
+
+        encoder = &tfp410_encoder->base;
+        encoder->possible_crtcs = 1;
+
+        ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
+                        DRM_MODE_ENCODER_TMDS);
+        if (ret < 0)
+                goto fail;
+
+        drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
+
+        return encoder;
+
+fail:
+        tfp410_encoder_destroy(encoder);
+        return NULL;
+}
+
+/*
+ * Connector:
+ */
+
+struct tfp410_connector {
+        struct drm_connector base;
+
+        struct drm_encoder *encoder;  /* our connected encoder */
+        struct tfp410_module *mod;
+};
+#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
+
+
+static void tfp410_connector_destroy(struct drm_connector *connector)
+{
+        struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
+        drm_connector_cleanup(connector);
+        kfree(tfp410_connector);
+}
+
+static enum drm_connector_status tfp410_connector_detect(
+                struct drm_connector *connector,
+                bool force)
+{
+        struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
+
+        if (drm_probe_ddc(tfp410_connector->mod->i2c))
+                return connector_status_connected;
+
+        return connector_status_unknown;
+}
+
+static int tfp410_connector_get_modes(struct drm_connector *connector)
+{
+        struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
+        struct edid *edid;
+        int ret = 0;
+
+        edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
+
+        drm_mode_connector_update_edid_property(connector, edid);
+
+        if (edid) {
+                ret = drm_add_edid_modes(connector, edid);
+                kfree(edid);
+        }
+
+        return ret;
+}
+
+static int tfp410_connector_mode_valid(struct drm_connector *connector,
+                  struct drm_display_mode *mode)
+{
+        struct tilcdc_drm_private *priv = connector->dev->dev_private;
+        /* our only constraints are what the crtc can generate: */
+        return tilcdc_crtc_mode_valid(priv->crtc, mode);
+}
+
+static struct drm_encoder *tfp410_connector_best_encoder(
+                struct drm_connector *connector)
+{
+        struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
+        return tfp410_connector->encoder;
+}
+
+static const struct drm_connector_funcs tfp410_connector_funcs = {
+        .destroy            = tfp410_connector_destroy,
+        .dpms               = drm_helper_connector_dpms,
+        .detect             = tfp410_connector_detect,
+        .fill_modes         = drm_helper_probe_single_connector_modes,
+};
+
+static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
+        .get_modes          = tfp410_connector_get_modes,
+        .mode_valid         = tfp410_connector_mode_valid,
+        .best_encoder       = tfp410_connector_best_encoder,
+};
+
+static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
+                struct tfp410_module *mod, struct drm_encoder *encoder)
+{
+        struct tfp410_connector *tfp410_connector;
+        struct drm_connector *connector;
+        int ret;
+
+        tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
+        if (!tfp410_connector) {
+                dev_err(dev->dev, "allocation failed\n");
+                return NULL;
+        }
+
+        tfp410_connector->encoder = encoder;
+        tfp410_connector->mod = mod;
+
+        connector = &tfp410_connector->base;
+
+        drm_connector_init(dev, connector, &tfp410_connector_funcs,
+                        DRM_MODE_CONNECTOR_DVID);
+        drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
+
+        connector->polled = DRM_CONNECTOR_POLL_CONNECT |
+                        DRM_CONNECTOR_POLL_DISCONNECT;
+
+        connector->interlace_allowed = 0;
+        connector->doublescan_allowed = 0;
+
+        ret = drm_mode_connector_attach_encoder(connector, encoder);
+        if (ret)
+                goto fail;
+
+        drm_sysfs_connector_add(connector);
+
+        return connector;
+
+fail:
+        tfp410_connector_destroy(connector);
+        return NULL;
+}
+
+/*
+ * Module:
+ */
+
+static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
+{
+        struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
+        struct tilcdc_drm_private *priv = dev->dev_private;
+        struct drm_encoder *encoder;
+        struct drm_connector *connector;
+
+        encoder = tfp410_encoder_create(dev, tfp410_mod);
+        if (!encoder)
+                return -ENOMEM;
+
+        connector = tfp410_connector_create(dev, tfp410_mod, encoder);
+        if (!connector)
+                return -ENOMEM;
+
+        priv->encoders[priv->num_encoders++] = encoder;
+        priv->connectors[priv->num_connectors++] = connector;
+
+        return 0;
+}
+
+static void tfp410_destroy(struct tilcdc_module *mod)
+{
+        struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
+
+        if (tfp410_mod->i2c)
+                i2c_put_adapter(tfp410_mod->i2c);
+
+        if (!IS_ERR_VALUE(tfp410_mod->gpio))
+                gpio_free(tfp410_mod->gpio);
+
+        tilcdc_module_cleanup(mod);
+        kfree(tfp410_mod);
+}
+
+static const struct tilcdc_module_ops tfp410_module_ops = {
+                .modeset_init = tfp410_modeset_init,
+                .destroy = tfp410_destroy,
+};
+
+/*
+ * Device:
+ */
+
+static struct of_device_id tfp410_of_match[];
+
+static int tfp410_probe(struct platform_device *pdev)
+{
+        struct device_node *node = pdev->dev.of_node;
+        struct device_node *i2c_node;
+        struct tfp410_module *tfp410_mod;
+        struct tilcdc_module *mod;
+        struct pinctrl *pinctrl;
+        uint32_t i2c_phandle;
+        int ret = -EINVAL;
+
+        /* bail out early if no DT data: */
+        if (!node) {
+                dev_err(&pdev->dev, "device-tree data is missing\n");
+                return -ENXIO;
+        }
+
+        tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
+        if (!tfp410_mod)
+                return -ENOMEM;
+
+        mod = &tfp410_mod->base;
+
+        tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
+
+        pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+        if (IS_ERR(pinctrl))
+                dev_warn(&pdev->dev, "pins are not configured\n");
+
+        if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
+                dev_err(&pdev->dev, "could not get i2c bus phandle\n");
+                goto fail;
+        }
+
+        i2c_node = of_find_node_by_phandle(i2c_phandle);
+        if (!i2c_node) {
+                dev_err(&pdev->dev, "could not get i2c bus node\n");
+                goto fail;
+        }
+
+        tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
+        if (!tfp410_mod->i2c) {
+                dev_err(&pdev->dev, "could not get i2c\n");
+                goto fail;
+        }
+
+        of_node_put(i2c_node);
+
+        tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
+                        0, NULL);
+        if (IS_ERR_VALUE(tfp410_mod->gpio)) {
+                dev_warn(&pdev->dev, "No power down GPIO\n");
+        } else {
+                ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
+                if (ret) {
+                        dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
+                        goto fail;
+                }
+        }
+
+        return 0;
+
+fail:
+        tfp410_destroy(mod);
+        return ret;
+}
+
+static int tfp410_remove(struct platform_device *pdev)
+{
+        return 0;
+}
+
+static struct of_device_id tfp410_of_match[] = {
+                { .compatible = "ti,tilcdc,tfp410", },
+                { },
+};
+MODULE_DEVICE_TABLE(of, tfp410_of_match);
+
+struct platform_driver tfp410_driver = {
+        .probe = tfp410_probe,
+        .remove = tfp410_remove,
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "tfp410",
+                .of_match_table = tfp410_of_match,
+        },
+};
+
+int __init tilcdc_tfp410_init(void)
+{
+        return platform_driver_register(&tfp410_driver);
+}
+
+void __exit tilcdc_tfp410_fini(void)
+{
+        platform_driver_unregister(&tfp410_driver);
+}