278 lines
6.2 KiB
C
278 lines
6.2 KiB
C
/*
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* OPA362 analog video amplifier with output/power control
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*
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* Copyright (C) 2014 Golden Delicious Computers
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* Author: H. Nikolaus Schaller <hns@goldelico.com>
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*
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* based on encoder-tfp410
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*
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* Copyright (C) 2013 Texas Instruments
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* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "../dss/omapdss.h"
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struct panel_drv_data {
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struct omap_dss_device dssdev;
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struct omap_dss_device *in;
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struct gpio_desc *enable_gpio;
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struct omap_video_timings timings;
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};
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#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
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static int opa362_connect(struct omap_dss_device *dssdev,
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struct omap_dss_device *dst)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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dev_dbg(dssdev->dev, "connect\n");
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if (omapdss_device_is_connected(dssdev))
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return -EBUSY;
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r = in->ops.atv->connect(in, dssdev);
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if (r)
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return r;
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dst->src = dssdev;
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dssdev->dst = dst;
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return 0;
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}
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static void opa362_disconnect(struct omap_dss_device *dssdev,
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struct omap_dss_device *dst)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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dev_dbg(dssdev->dev, "disconnect\n");
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WARN_ON(!omapdss_device_is_connected(dssdev));
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if (!omapdss_device_is_connected(dssdev))
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return;
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WARN_ON(dst != dssdev->dst);
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if (dst != dssdev->dst)
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return;
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dst->src = NULL;
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dssdev->dst = NULL;
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in->ops.atv->disconnect(in, &ddata->dssdev);
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}
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static int opa362_enable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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int r;
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dev_dbg(dssdev->dev, "enable\n");
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if (!omapdss_device_is_connected(dssdev))
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return -ENODEV;
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if (omapdss_device_is_enabled(dssdev))
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return 0;
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in->ops.atv->set_timings(in, &ddata->timings);
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r = in->ops.atv->enable(in);
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if (r)
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return r;
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if (ddata->enable_gpio)
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gpiod_set_value_cansleep(ddata->enable_gpio, 1);
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dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
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return 0;
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}
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static void opa362_disable(struct omap_dss_device *dssdev)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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dev_dbg(dssdev->dev, "disable\n");
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if (!omapdss_device_is_enabled(dssdev))
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return;
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if (ddata->enable_gpio)
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gpiod_set_value_cansleep(ddata->enable_gpio, 0);
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in->ops.atv->disable(in);
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dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
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}
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static void opa362_set_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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dev_dbg(dssdev->dev, "set_timings\n");
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ddata->timings = *timings;
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dssdev->panel.timings = *timings;
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in->ops.atv->set_timings(in, timings);
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}
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static void opa362_get_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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dev_dbg(dssdev->dev, "get_timings\n");
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*timings = ddata->timings;
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}
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static int opa362_check_timings(struct omap_dss_device *dssdev,
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struct omap_video_timings *timings)
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{
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struct panel_drv_data *ddata = to_panel_data(dssdev);
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struct omap_dss_device *in = ddata->in;
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dev_dbg(dssdev->dev, "check_timings\n");
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return in->ops.atv->check_timings(in, timings);
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}
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static void opa362_set_type(struct omap_dss_device *dssdev,
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enum omap_dss_venc_type type)
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{
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/* we can only drive a COMPOSITE output */
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WARN_ON(type != OMAP_DSS_VENC_TYPE_COMPOSITE);
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}
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static const struct omapdss_atv_ops opa362_atv_ops = {
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.connect = opa362_connect,
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.disconnect = opa362_disconnect,
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.enable = opa362_enable,
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.disable = opa362_disable,
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.check_timings = opa362_check_timings,
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.set_timings = opa362_set_timings,
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.get_timings = opa362_get_timings,
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.set_type = opa362_set_type,
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};
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static int opa362_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct panel_drv_data *ddata;
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struct omap_dss_device *dssdev, *in;
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struct gpio_desc *gpio;
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int r;
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dev_dbg(&pdev->dev, "probe\n");
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if (node == NULL) {
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dev_err(&pdev->dev, "Unable to find device tree\n");
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return -EINVAL;
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}
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ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
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if (!ddata)
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return -ENOMEM;
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platform_set_drvdata(pdev, ddata);
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gpio = devm_gpiod_get_optional(&pdev->dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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ddata->enable_gpio = gpio;
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in = omapdss_of_find_source_for_first_ep(node);
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if (IS_ERR(in)) {
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dev_err(&pdev->dev, "failed to find video source\n");
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return PTR_ERR(in);
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}
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ddata->in = in;
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dssdev = &ddata->dssdev;
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dssdev->ops.atv = &opa362_atv_ops;
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dssdev->dev = &pdev->dev;
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dssdev->type = OMAP_DISPLAY_TYPE_VENC;
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dssdev->output_type = OMAP_DISPLAY_TYPE_VENC;
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dssdev->owner = THIS_MODULE;
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r = omapdss_register_output(dssdev);
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if (r) {
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dev_err(&pdev->dev, "Failed to register output\n");
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goto err_reg;
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}
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return 0;
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err_reg:
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omap_dss_put_device(ddata->in);
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return r;
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}
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static int __exit opa362_remove(struct platform_device *pdev)
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{
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struct panel_drv_data *ddata = platform_get_drvdata(pdev);
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struct omap_dss_device *dssdev = &ddata->dssdev;
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struct omap_dss_device *in = ddata->in;
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omapdss_unregister_output(&ddata->dssdev);
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WARN_ON(omapdss_device_is_enabled(dssdev));
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if (omapdss_device_is_enabled(dssdev))
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opa362_disable(dssdev);
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WARN_ON(omapdss_device_is_connected(dssdev));
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if (omapdss_device_is_connected(dssdev))
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opa362_disconnect(dssdev, dssdev->dst);
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omap_dss_put_device(in);
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return 0;
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}
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static const struct of_device_id opa362_of_match[] = {
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{ .compatible = "omapdss,ti,opa362", },
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{},
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};
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MODULE_DEVICE_TABLE(of, opa362_of_match);
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static struct platform_driver opa362_driver = {
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.probe = opa362_probe,
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.remove = __exit_p(opa362_remove),
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.driver = {
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.name = "amplifier-opa362",
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.of_match_table = opa362_of_match,
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.suppress_bind_attrs = true,
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},
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};
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module_platform_driver(opa362_driver);
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MODULE_AUTHOR("H. Nikolaus Schaller <hns@goldelico.com>");
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MODULE_DESCRIPTION("OPA362 analog video amplifier with output/power control");
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MODULE_LICENSE("GPL v2");
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