| /* |
| * 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 <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; |
| |
| struct completion hpd_completion; |
| }; |
| |
| #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev) |
| |
| static irqreturn_t tpd_hpd_irq_handler(int irq, void *data) |
| { |
| struct panel_drv_data *ddata = data; |
| bool hpd; |
| |
| hpd = gpio_get_value_cansleep(ddata->hpd_gpio); |
| |
| dev_dbg(ddata->dssdev.dev, "hpd %d\n", hpd); |
| |
| if (gpio_is_valid(ddata->ls_oe_gpio)) { |
| if (hpd) |
| gpio_set_value_cansleep(ddata->ls_oe_gpio, 1); |
| else |
| gpio_set_value_cansleep(ddata->ls_oe_gpio, 0); |
| } |
| |
| complete_all(&ddata->hpd_completion); |
| |
| return IRQ_HANDLED; |
| } |
| |
| 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; |
| |
| INIT_COMPLETION(ddata->hpd_completion); |
| |
| 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); |
| |
| /* |
| * If there's a cable connected, wait for the hpd irq to trigger, |
| * which turns on the level shifters. |
| */ |
| if (gpio_get_value_cansleep(ddata->hpd_gpio)) { |
| unsigned long to; |
| to = wait_for_completion_timeout(&ddata->hpd_completion, |
| msecs_to_jiffies(250)); |
| WARN_ON_ONCE(to == 0); |
| } |
| |
| 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; |
| |
| if (!gpio_get_value_cansleep(ddata->hpd_gpio)) |
| return -ENODEV; |
| |
| return in->ops.hdmi->read_edid(in, edid, len); |
| } |
| |
| 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_audio_enable(struct omap_dss_device *dssdev) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| return in->ops.hdmi->audio_enable(in); |
| } |
| |
| static void tpd_audio_disable(struct omap_dss_device *dssdev) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| in->ops.hdmi->audio_disable(in); |
| } |
| |
| static int tpd_audio_start(struct omap_dss_device *dssdev) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| return in->ops.hdmi->audio_start(in); |
| } |
| |
| static void tpd_audio_stop(struct omap_dss_device *dssdev) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| in->ops.hdmi->audio_stop(in); |
| } |
| |
| static bool tpd_audio_supported(struct omap_dss_device *dssdev) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| return in->ops.hdmi->audio_supported(in); |
| } |
| |
| static int tpd_audio_config(struct omap_dss_device *dssdev, |
| struct omap_dss_audio *audio) |
| { |
| struct panel_drv_data *ddata = to_panel_data(dssdev); |
| struct omap_dss_device *in = ddata->in; |
| |
| return in->ops.hdmi->audio_config(in, audio); |
| } |
| |
| 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, |
| |
| .audio_enable = tpd_audio_enable, |
| .audio_disable = tpd_audio_disable, |
| .audio_start = tpd_audio_start, |
| .audio_stop = tpd_audio_stop, |
| .audio_supported = tpd_audio_supported, |
| .audio_config = tpd_audio_config, |
| }; |
| |
| 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(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); |
| |
| init_completion(&ddata->hpd_completion); |
| |
| if (dev_get_platdata(&pdev->dev)) { |
| r = tpd_probe_pdata(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; |
| |
| r = devm_request_threaded_irq(&pdev->dev, gpio_to_irq(ddata->hpd_gpio), |
| NULL, tpd_hpd_irq_handler, |
| IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | |
| IRQF_ONESHOT, "hpd", ddata); |
| if (r) |
| goto err_irq; |
| |
| 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; |
| |
| 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_irq: |
| 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 struct platform_driver tpd_driver = { |
| .probe = tpd_probe, |
| .remove = __exit_p(tpd_remove), |
| .driver = { |
| .name = "tpd12s015", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| module_platform_driver(tpd_driver); |
| |
| MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); |
| MODULE_DESCRIPTION("TPD12S015 driver"); |
| MODULE_LICENSE("GPL"); |