--- /dev/null
+/*
+ * TPD12S015 HDMI ESD protection & level shifter chip 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/completion.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.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 ct_cp_hpd_gpio;
+ int ls_oe_gpio;
+ int hpd_gpio;
+
+ struct omap_video_timings timings;
+};
+
+#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
+
+static int tpd_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;
+
+ r = in->ops.hdmi->connect(in, dssdev);
+ if (r)
+ return r;
+
+ dst->src = dssdev;
+ dssdev->dst = dst;
+
+ gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
+ /* DC-DC converter needs at max 300us to get to 90% of 5V */
+ udelay(300);
+
+ return 0;
+}
+
+static void tpd_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(dst != dssdev->dst);
+
+ if (dst != dssdev->dst)
+ return;
+
+ gpio_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);
+
+ dst->src = NULL;
+ dssdev->dst = NULL;
+
+ in->ops.hdmi->disconnect(in, &ddata->dssdev);
+}
+
+static int tpd_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 (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
+ return 0;
+
+ in->ops.hdmi->set_timings(in, &ddata->timings);
+
+ r = in->ops.hdmi->enable(in);
+ if (r)
+ return r;
+
+ dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+ return r;
+}
+
+static void tpd_disable(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
+ return;
+
+ in->ops.hdmi->disable(in);
+
+ dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+}
+
+static void tpd_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.hdmi->set_timings(in, timings);
+}
+
+static void tpd_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 tpd_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;
+ int r;
+
+ r = in->ops.hdmi->check_timings(in, timings);
+
+ return r;
+}
+
+static int tpd_read_edid(struct omap_dss_device *dssdev,
+ u8 *edid, int len)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ if (!gpio_get_value_cansleep(ddata->hpd_gpio))
+ return -ENODEV;
+
+ if (gpio_is_valid(ddata->ls_oe_gpio))
+ gpio_set_value_cansleep(ddata->ls_oe_gpio, 1);
+
+ r = in->ops.hdmi->read_edid(in, edid, len);
+
+ if (gpio_is_valid(ddata->ls_oe_gpio))
+ gpio_set_value_cansleep(ddata->ls_oe_gpio, 0);
+
+ return r;
+}
+
+static bool tpd_detect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+ return gpio_get_value_cansleep(ddata->hpd_gpio);
+}
+
+static int tpd_set_infoframe(struct omap_dss_device *dssdev,
+ const struct hdmi_avi_infoframe *avi)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ return in->ops.hdmi->set_infoframe(in, avi);
+}
+
+static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
+ bool hdmi_mode)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
+}
+
+static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
+ .connect = tpd_connect,
+ .disconnect = tpd_disconnect,
+
+ .enable = tpd_enable,
+ .disable = tpd_disable,
+
+ .check_timings = tpd_check_timings,
+ .set_timings = tpd_set_timings,
+ .get_timings = tpd_get_timings,
+
+ .read_edid = tpd_read_edid,
+ .detect = tpd_detect,
+ .set_infoframe = tpd_set_infoframe,
+ .set_hdmi_mode = tpd_set_hdmi_mode,
+};
+
+static int tpd_probe_pdata(struct platform_device *pdev)
+{
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct encoder_tpd12s015_platform_data *pdata;
+ struct omap_dss_device *dssdev, *in;
+
+ pdata = dev_get_platdata(&pdev->dev);
+
+ ddata->ct_cp_hpd_gpio = pdata->ct_cp_hpd_gpio;
+ ddata->ls_oe_gpio = pdata->ls_oe_gpio;
+ ddata->hpd_gpio = pdata->hpd_gpio;
+
+ 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 tpd_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;
+
+ /* CT CP HPD GPIO */
+ gpio = of_get_gpio(node, 0);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(&pdev->dev, "failed to parse CT CP HPD gpio\n");
+ return gpio;
+ }
+ ddata->ct_cp_hpd_gpio = gpio;
+
+ /* LS OE GPIO */
+ gpio = of_get_gpio(node, 1);
+ if (gpio_is_valid(gpio) || gpio == -ENOENT) {
+ ddata->ls_oe_gpio = gpio;
+ } else {
+ dev_err(&pdev->dev, "failed to parse LS OE gpio\n");
+ return gpio;
+ }
+
+ /* HPD GPIO */
+ gpio = of_get_gpio(node, 2);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(&pdev->dev, "failed to parse HPD gpio\n");
+ return gpio;
+ }
+ ddata->hpd_gpio = 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 tpd_probe(struct platform_device *pdev)
+{
+ struct omap_dss_device *in, *dssdev;
+ struct panel_drv_data *ddata;
+ 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 = tpd_probe_pdata(pdev);
+ if (r)
+ return r;
+ } else if (pdev->dev.of_node) {
+ r = tpd_probe_of(pdev);
+ if (r)
+ return r;
+ } else {
+ return -ENODEV;
+ }
+
+ r = devm_gpio_request_one(&pdev->dev, ddata->ct_cp_hpd_gpio,
+ GPIOF_OUT_INIT_LOW, "hdmi_ct_cp_hpd");
+ if (r)
+ goto err_gpio;
+
+ if (gpio_is_valid(ddata->ls_oe_gpio)) {
+ r = devm_gpio_request_one(&pdev->dev, ddata->ls_oe_gpio,
+ GPIOF_OUT_INIT_LOW, "hdmi_ls_oe");
+ if (r)
+ goto err_gpio;
+ }
+
+ r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
+ GPIOF_DIR_IN, "hdmi_hpd");
+ if (r)
+ goto err_gpio;
+
+ dssdev = &ddata->dssdev;
+ dssdev->ops.hdmi = &tpd_hdmi_ops;
+ dssdev->dev = &pdev->dev;
+ dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
+ dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
+ dssdev->owner = THIS_MODULE;
+ dssdev->port_num = 1;
+
+ in = ddata->in;
+
+ 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 tpd_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))
+ tpd_disable(dssdev);
+
+ WARN_ON(omapdss_device_is_connected(dssdev));
+ if (omapdss_device_is_connected(dssdev))
+ tpd_disconnect(dssdev, dssdev->dst);
+
+ omap_dss_put_device(in);
+
+ return 0;
+}
+
+static const struct of_device_id tpd_of_match[] = {
+ { .compatible = "omapdss,ti,tpd12s015", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, tpd_of_match);
+
+static struct platform_driver tpd_driver = {
+ .probe = tpd_probe,
+ .remove = __exit_p(tpd_remove),
+ .driver = {
+ .name = "tpd12s015",
+ .of_match_table = tpd_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+
+module_platform_driver(tpd_driver);
+
+MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
+MODULE_DESCRIPTION("TPD12S015 driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff