--- /dev/null
+/*
+ * Generic DVI Connector 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/i2c.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <drm/drm_edid.h>
+
+#include <video/omapdss.h>
+#include <video/omap-panel-data.h>
+
+static const struct omap_video_timings dvic_default_timings = {
+ .x_res = 640,
+ .y_res = 480,
+
+ .pixelclock = 23500000,
+
+ .hfp = 48,
+ .hsw = 32,
+ .hbp = 80,
+
+ .vfp = 3,
+ .vsw = 4,
+ .vbp = 7,
+
+ .vsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
+ .hsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
+ .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
+ .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
+ .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
+};
+
+struct panel_drv_data {
+ struct omap_dss_device dssdev;
+ struct omap_dss_device *in;
+
+ struct omap_video_timings timings;
+
+ struct i2c_adapter *i2c_adapter;
+};
+
+#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
+
+static int dvic_connect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ if (omapdss_device_is_connected(dssdev))
+ return 0;
+
+ r = in->ops.dvi->connect(in, dssdev);
+ if (r)
+ return r;
+
+ return 0;
+}
+
+static void dvic_disconnect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ if (!omapdss_device_is_connected(dssdev))
+ return;
+
+ in->ops.dvi->disconnect(in, dssdev);
+}
+
+static int dvic_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 (!omapdss_device_is_connected(dssdev))
+ return -ENODEV;
+
+ if (omapdss_device_is_enabled(dssdev))
+ return 0;
+
+ in->ops.dvi->set_timings(in, &ddata->timings);
+
+ r = in->ops.dvi->enable(in);
+ if (r)
+ return r;
+
+ dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+ return 0;
+}
+
+static void dvic_disable(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ if (!omapdss_device_is_enabled(dssdev))
+ return;
+
+ in->ops.dvi->disable(in);
+
+ dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void dvic_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.dvi->set_timings(in, timings);
+}
+
+static void dvic_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 dvic_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;
+
+ return in->ops.dvi->check_timings(in, timings);
+}
+
+static int dvic_ddc_read(struct i2c_adapter *adapter,
+ unsigned char *buf, u16 count, u8 offset)
+{
+ int r, retries;
+
+ for (retries = 3; retries > 0; retries--) {
+ struct i2c_msg msgs[] = {
+ {
+ .addr = DDC_ADDR,
+ .flags = 0,
+ .len = 1,
+ .buf = &offset,
+ }, {
+ .addr = DDC_ADDR,
+ .flags = I2C_M_RD,
+ .len = count,
+ .buf = buf,
+ }
+ };
+
+ r = i2c_transfer(adapter, msgs, 2);
+ if (r == 2)
+ return 0;
+
+ if (r != -EAGAIN)
+ break;
+ }
+
+ return r < 0 ? r : -EIO;
+}
+
+static int dvic_read_edid(struct omap_dss_device *dssdev,
+ u8 *edid, int len)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ int r, l, bytes_read;
+
+ if (!ddata->i2c_adapter)
+ return -ENODEV;
+
+ l = min(EDID_LENGTH, len);
+ r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
+ if (r)
+ return r;
+
+ bytes_read = l;
+
+ /* if there are extensions, read second block */
+ if (len > EDID_LENGTH && edid[0x7e] > 0) {
+ l = min(EDID_LENGTH, len - EDID_LENGTH);
+
+ r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
+ l, EDID_LENGTH);
+ if (r)
+ return r;
+
+ bytes_read += l;
+ }
+
+ return bytes_read;
+}
+
+static bool dvic_detect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ unsigned char out;
+ int r;
+
+ if (!ddata->i2c_adapter)
+ return true;
+
+ r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
+
+ return r == 0;
+}
+
+static struct omap_dss_driver dvic_driver = {
+ .connect = dvic_connect,
+ .disconnect = dvic_disconnect,
+
+ .enable = dvic_enable,
+ .disable = dvic_disable,
+
+ .set_timings = dvic_set_timings,
+ .get_timings = dvic_get_timings,
+ .check_timings = dvic_check_timings,
+
+ .get_resolution = omapdss_default_get_resolution,
+
+ .read_edid = dvic_read_edid,
+ .detect = dvic_detect,
+};
+
+static int dvic_probe_pdata(struct platform_device *pdev)
+{
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct connector_dvi_platform_data *pdata;
+ struct omap_dss_device *in, *dssdev;
+ int i2c_bus_num;
+
+ pdata = dev_get_platdata(&pdev->dev);
+ i2c_bus_num = pdata->i2c_bus_num;
+
+ if (i2c_bus_num != -1) {
+ struct i2c_adapter *adapter;
+
+ adapter = i2c_get_adapter(i2c_bus_num);
+ if (!adapter) {
+ dev_err(&pdev->dev,
+ "Failed to get I2C adapter, bus %d\n",
+ i2c_bus_num);
+ return -EPROBE_DEFER;
+ }
+
+ ddata->i2c_adapter = adapter;
+ }
+
+ in = omap_dss_find_output(pdata->source);
+ if (in == NULL) {
+ i2c_put_adapter(ddata->i2c_adapter);
+
+ dev_err(&pdev->dev, "Failed to find video source\n");
+ return -EPROBE_DEFER;
+ }
+
+ ddata->in = in;
+
+ dssdev = &ddata->dssdev;
+ dssdev->name = pdata->name;
+
+ return 0;
+}
+
+static int dvic_probe_of(struct platform_device *pdev)
+{
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct device_node *node = pdev->dev.of_node;
+ struct omap_dss_device *in;
+ struct device_node *adapter_node;
+ struct i2c_adapter *adapter;
+
+ 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;
+
+ adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
+ if (adapter_node) {
+ adapter = of_find_i2c_adapter_by_node(adapter_node);
+ if (adapter == NULL) {
+ dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
+ omap_dss_put_device(ddata->in);
+ return -EPROBE_DEFER;
+ }
+
+ ddata->i2c_adapter = adapter;
+ }
+
+ return 0;
+}
+
+static int dvic_probe(struct platform_device *pdev)
+{
+ struct panel_drv_data *ddata;
+ struct omap_dss_device *dssdev;
+ int r;
+
+ ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, ddata);
+
+ if (dev_get_platdata(&pdev->dev)) {
+ r = dvic_probe_pdata(pdev);
+ if (r)
+ return r;
+ } else if (pdev->dev.of_node) {
+ r = dvic_probe_of(pdev);
+ if (r)
+ return r;
+ } else {
+ return -ENODEV;
+ }
+
+ ddata->timings = dvic_default_timings;
+
+ dssdev = &ddata->dssdev;
+ dssdev->driver = &dvic_driver;
+ dssdev->dev = &pdev->dev;
+ dssdev->type = OMAP_DISPLAY_TYPE_DVI;
+ dssdev->owner = THIS_MODULE;
+ dssdev->panel.timings = dvic_default_timings;
+
+ r = omapdss_register_display(dssdev);
+ if (r) {
+ dev_err(&pdev->dev, "Failed to register panel\n");
+ goto err_reg;
+ }
+
+ return 0;
+
+err_reg:
+ omap_dss_put_device(ddata->in);
+
+ i2c_put_adapter(ddata->i2c_adapter);
+
+ return r;
+}
+
+static int __exit dvic_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_display(&ddata->dssdev);
+
+ dvic_disable(dssdev);
+ dvic_disconnect(dssdev);
+
+ omap_dss_put_device(in);
+
+ i2c_put_adapter(ddata->i2c_adapter);
+
+ return 0;
+}
+
+static const struct of_device_id dvic_of_match[] = {
+ { .compatible = "omapdss,dvi-connector", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, dvic_of_match);
+
+static struct platform_driver dvi_connector_driver = {
+ .probe = dvic_probe,
+ .remove = __exit_p(dvic_remove),
+ .driver = {
+ .name = "connector-dvi",
+ .of_match_table = dvic_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+module_platform_driver(dvi_connector_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("Generic DVI Connector driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff