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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * TPD12S015 HDMI ESD protection & level shifter chip driver4 *5 * Copyright (C) 2013 Texas Instruments6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>7 */8 9#include <linux/completion.h>10#include <linux/delay.h>11#include <linux/module.h>12#include <linux/mod_devicetable.h>13#include <linux/slab.h>14#include <linux/platform_device.h>15#include <linux/gpio/consumer.h>16 17#include <video/omapfb_dss.h>18 19struct panel_drv_data {20 struct omap_dss_device dssdev;21 struct omap_dss_device *in;22 23 struct gpio_desc *ct_cp_hpd_gpio;24 struct gpio_desc *ls_oe_gpio;25 struct gpio_desc *hpd_gpio;26 27 struct omap_video_timings timings;28};29 30#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)31 32static int tpd_connect(struct omap_dss_device *dssdev,33 struct omap_dss_device *dst)34{35 struct panel_drv_data *ddata = to_panel_data(dssdev);36 struct omap_dss_device *in = ddata->in;37 int r;38 39 r = in->ops.hdmi->connect(in, dssdev);40 if (r)41 return r;42 43 dst->src = dssdev;44 dssdev->dst = dst;45 46 if (ddata->ct_cp_hpd_gpio) {47 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);48 /* DC-DC converter needs at max 300us to get to 90% of 5V */49 udelay(300);50 }51 52 return 0;53}54 55static void tpd_disconnect(struct omap_dss_device *dssdev,56 struct omap_dss_device *dst)57{58 struct panel_drv_data *ddata = to_panel_data(dssdev);59 struct omap_dss_device *in = ddata->in;60 61 WARN_ON(dst != dssdev->dst);62 63 if (dst != dssdev->dst)64 return;65 66 gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);67 68 dst->src = NULL;69 dssdev->dst = NULL;70 71 in->ops.hdmi->disconnect(in, &ddata->dssdev);72}73 74static int tpd_enable(struct omap_dss_device *dssdev)75{76 struct panel_drv_data *ddata = to_panel_data(dssdev);77 struct omap_dss_device *in = ddata->in;78 int r;79 80 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)81 return 0;82 83 in->ops.hdmi->set_timings(in, &ddata->timings);84 85 r = in->ops.hdmi->enable(in);86 if (r)87 return r;88 89 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;90 91 return r;92}93 94static void tpd_disable(struct omap_dss_device *dssdev)95{96 struct panel_drv_data *ddata = to_panel_data(dssdev);97 struct omap_dss_device *in = ddata->in;98 99 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)100 return;101 102 in->ops.hdmi->disable(in);103 104 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;105}106 107static void tpd_set_timings(struct omap_dss_device *dssdev,108 struct omap_video_timings *timings)109{110 struct panel_drv_data *ddata = to_panel_data(dssdev);111 struct omap_dss_device *in = ddata->in;112 113 ddata->timings = *timings;114 dssdev->panel.timings = *timings;115 116 in->ops.hdmi->set_timings(in, timings);117}118 119static void tpd_get_timings(struct omap_dss_device *dssdev,120 struct omap_video_timings *timings)121{122 struct panel_drv_data *ddata = to_panel_data(dssdev);123 124 *timings = ddata->timings;125}126 127static int tpd_check_timings(struct omap_dss_device *dssdev,128 struct omap_video_timings *timings)129{130 struct panel_drv_data *ddata = to_panel_data(dssdev);131 struct omap_dss_device *in = ddata->in;132 int r;133 134 r = in->ops.hdmi->check_timings(in, timings);135 136 return r;137}138 139static int tpd_read_edid(struct omap_dss_device *dssdev,140 u8 *edid, int len)141{142 struct panel_drv_data *ddata = to_panel_data(dssdev);143 struct omap_dss_device *in = ddata->in;144 int r;145 146 if (!gpiod_get_value_cansleep(ddata->hpd_gpio))147 return -ENODEV;148 149 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);150 151 r = in->ops.hdmi->read_edid(in, edid, len);152 153 gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);154 155 return r;156}157 158static bool tpd_detect(struct omap_dss_device *dssdev)159{160 struct panel_drv_data *ddata = to_panel_data(dssdev);161 162 return gpiod_get_value_cansleep(ddata->hpd_gpio);163}164 165static int tpd_set_infoframe(struct omap_dss_device *dssdev,166 const struct hdmi_avi_infoframe *avi)167{168 struct panel_drv_data *ddata = to_panel_data(dssdev);169 struct omap_dss_device *in = ddata->in;170 171 return in->ops.hdmi->set_infoframe(in, avi);172}173 174static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,175 bool hdmi_mode)176{177 struct panel_drv_data *ddata = to_panel_data(dssdev);178 struct omap_dss_device *in = ddata->in;179 180 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);181}182 183static const struct omapdss_hdmi_ops tpd_hdmi_ops = {184 .connect = tpd_connect,185 .disconnect = tpd_disconnect,186 187 .enable = tpd_enable,188 .disable = tpd_disable,189 190 .check_timings = tpd_check_timings,191 .set_timings = tpd_set_timings,192 .get_timings = tpd_get_timings,193 194 .read_edid = tpd_read_edid,195 .detect = tpd_detect,196 .set_infoframe = tpd_set_infoframe,197 .set_hdmi_mode = tpd_set_hdmi_mode,198};199 200static int tpd_probe_of(struct platform_device *pdev)201{202 struct panel_drv_data *ddata = platform_get_drvdata(pdev);203 struct device_node *node = pdev->dev.of_node;204 struct omap_dss_device *in;205 206 in = omapdss_of_find_source_for_first_ep(node);207 if (IS_ERR(in)) {208 dev_err(&pdev->dev, "failed to find video source\n");209 return PTR_ERR(in);210 }211 212 ddata->in = in;213 214 return 0;215}216 217static int tpd_probe(struct platform_device *pdev)218{219 struct omap_dss_device *dssdev;220 struct panel_drv_data *ddata;221 int r;222 struct gpio_desc *gpio;223 224 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);225 if (!ddata)226 return -ENOMEM;227 228 platform_set_drvdata(pdev, ddata);229 230 if (pdev->dev.of_node) {231 r = tpd_probe_of(pdev);232 if (r)233 return r;234 } else {235 return -ENODEV;236 }237 238 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,239 GPIOD_OUT_LOW);240 if (IS_ERR(gpio)) {241 r = PTR_ERR(gpio);242 goto err_gpio;243 }244 245 ddata->ct_cp_hpd_gpio = gpio;246 247 gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,248 GPIOD_OUT_LOW);249 if (IS_ERR(gpio)) {250 r = PTR_ERR(gpio);251 goto err_gpio;252 }253 254 ddata->ls_oe_gpio = gpio;255 256 gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,257 GPIOD_IN);258 if (IS_ERR(gpio)) {259 r = PTR_ERR(gpio);260 goto err_gpio;261 }262 263 ddata->hpd_gpio = gpio;264 265 dssdev = &ddata->dssdev;266 dssdev->ops.hdmi = &tpd_hdmi_ops;267 dssdev->dev = &pdev->dev;268 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;269 dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;270 dssdev->owner = THIS_MODULE;271 dssdev->port_num = 1;272 273 r = omapdss_register_output(dssdev);274 if (r) {275 dev_err(&pdev->dev, "Failed to register output\n");276 goto err_reg;277 }278 279 return 0;280err_reg:281err_gpio:282 omap_dss_put_device(ddata->in);283 return r;284}285 286static void tpd_remove(struct platform_device *pdev)287{288 struct panel_drv_data *ddata = platform_get_drvdata(pdev);289 struct omap_dss_device *dssdev = &ddata->dssdev;290 struct omap_dss_device *in = ddata->in;291 292 omapdss_unregister_output(&ddata->dssdev);293 294 WARN_ON(omapdss_device_is_enabled(dssdev));295 if (omapdss_device_is_enabled(dssdev))296 tpd_disable(dssdev);297 298 WARN_ON(omapdss_device_is_connected(dssdev));299 if (omapdss_device_is_connected(dssdev))300 tpd_disconnect(dssdev, dssdev->dst);301 302 omap_dss_put_device(in);303}304 305static const struct of_device_id tpd_of_match[] = {306 { .compatible = "omapdss,ti,tpd12s015", },307 {},308};309 310MODULE_DEVICE_TABLE(of, tpd_of_match);311 312static struct platform_driver tpd_driver = {313 .probe = tpd_probe,314 .remove = tpd_remove,315 .driver = {316 .name = "tpd12s015",317 .of_match_table = tpd_of_match,318 },319};320 321module_platform_driver(tpd_driver);322 323MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");324MODULE_DESCRIPTION("TPD12S015 driver");325MODULE_LICENSE("GPL");326