| /* |
| * 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_OPPOSITE_EDGES, |
| }; |
| |
| 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"); |