| /* |
| * TFP410 DPI-to-DVI encoder 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/gpio.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/of_gpio.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 pd_gpio; |
| int data_lines; |
| |
| struct omap_video_timings timings; |
| }; |
| |
| #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) |
| |
| static int tfp410_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; |
| |
| if (omapdss_device_is_connected(dssdev)) |
| return -EBUSY; |
| |
| r = in->ops.dpi->connect(in, dssdev); |
| if (r) |
| return r; |
| |
| dst->src = dssdev; |
| dssdev->dst = dst; |
| |
| return 0; |
| } |
| |
| static void tfp410_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(!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.dpi->disconnect(in, &ddata->dssdev); |
| } |
| |
| static int tfp410_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.dpi->set_timings(in, &ddata->timings); |
| if (ddata->data_lines) |
| in->ops.dpi->set_data_lines(in, ddata->data_lines); |
| |
| r = in->ops.dpi->enable(in); |
| if (r) |
| return r; |
| |
| if (gpio_is_valid(ddata->pd_gpio)) |
| gpio_set_value_cansleep(ddata->pd_gpio, 1); |
| |
| dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; |
| |
| return 0; |
| } |
| |
| static void tfp410_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; |
| |
| if (gpio_is_valid(ddata->pd_gpio)) |
| gpio_set_value_cansleep(ddata->pd_gpio, 0); |
| |
| in->ops.dpi->disable(in); |
| |
| dssdev->state = OMAP_DSS_DISPLAY_DISABLED; |
| } |
| |
| static void tfp410_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.dpi->set_timings(in, timings); |
| } |
| |
| static void tfp410_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 tfp410_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.dpi->check_timings(in, timings); |
| } |
| |
| static const struct omapdss_dvi_ops tfp410_dvi_ops = { |
| .connect = tfp410_connect, |
| .disconnect = tfp410_disconnect, |
| |
| .enable = tfp410_enable, |
| .disable = tfp410_disable, |
| |
| .check_timings = tfp410_check_timings, |
| .set_timings = tfp410_set_timings, |
| .get_timings = tfp410_get_timings, |
| }; |
| |
| static int tfp410_probe_pdata(struct platform_device *pdev) |
| { |
| struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| struct encoder_tfp410_platform_data *pdata; |
| struct omap_dss_device *dssdev, *in; |
| |
| pdata = dev_get_platdata(&pdev->dev); |
| |
| ddata->pd_gpio = pdata->power_down_gpio; |
| |
| ddata->data_lines = pdata->data_lines; |
| |
| 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 tfp410_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; |
| int gpio; |
| |
| gpio = of_get_named_gpio(node, "powerdown-gpios", 0); |
| |
| if (gpio_is_valid(gpio) || gpio == -ENOENT) { |
| ddata->pd_gpio = gpio; |
| } else { |
| dev_err(&pdev->dev, "failed to parse PD gpio\n"); |
| return 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; |
| |
| return 0; |
| } |
| |
| static int tfp410_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 = tfp410_probe_pdata(pdev); |
| if (r) |
| return r; |
| } else if (pdev->dev.of_node) { |
| r = tfp410_probe_of(pdev); |
| if (r) |
| return r; |
| } else { |
| return -ENODEV; |
| } |
| |
| if (gpio_is_valid(ddata->pd_gpio)) { |
| r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio, |
| GPIOF_OUT_INIT_LOW, "tfp410 PD"); |
| if (r) { |
| dev_err(&pdev->dev, "Failed to request PD GPIO %d\n", |
| ddata->pd_gpio); |
| goto err_gpio; |
| } |
| } |
| |
| dssdev = &ddata->dssdev; |
| dssdev->ops.dvi = &tfp410_dvi_ops; |
| dssdev->dev = &pdev->dev; |
| dssdev->type = OMAP_DISPLAY_TYPE_DPI; |
| dssdev->output_type = OMAP_DISPLAY_TYPE_DVI; |
| dssdev->owner = THIS_MODULE; |
| dssdev->phy.dpi.data_lines = ddata->data_lines; |
| dssdev->port_num = 1; |
| |
| r = omapdss_register_output(dssdev); |
| if (r) { |
| dev_err(&pdev->dev, "Failed to register output\n"); |
| goto err_reg; |
| } |
| |
| return 0; |
| err_reg: |
| err_gpio: |
| omap_dss_put_device(ddata->in); |
| return r; |
| } |
| |
| static int __exit tfp410_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)) |
| tfp410_disable(dssdev); |
| |
| WARN_ON(omapdss_device_is_connected(dssdev)); |
| if (omapdss_device_is_connected(dssdev)) |
| tfp410_disconnect(dssdev, dssdev->dst); |
| |
| omap_dss_put_device(in); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id tfp410_of_match[] = { |
| { .compatible = "omapdss,ti,tfp410", }, |
| {}, |
| }; |
| |
| MODULE_DEVICE_TABLE(of, tfp410_of_match); |
| |
| static struct platform_driver tfp410_driver = { |
| .probe = tfp410_probe, |
| .remove = __exit_p(tfp410_remove), |
| .driver = { |
| .name = "tfp410", |
| .of_match_table = tfp410_of_match, |
| .suppress_bind_attrs = true, |
| }, |
| }; |
| |
| module_platform_driver(tfp410_driver); |
| |
| MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); |
| MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver"); |
| MODULE_LICENSE("GPL"); |