diff options
Diffstat (limited to 'drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c')
-rw-r--r-- | drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c b/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c new file mode 100644 index 0000000..990af6b --- /dev/null +++ b/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c @@ -0,0 +1,379 @@ +/* + * 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"); |