2 * Generic DVI Connector driver
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
12 #include <linux/gpio/consumer.h>
13 #include <linux/i2c.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
18 #include <drm/drm_edid.h>
20 #include "../dss/omapdss.h"
22 struct panel_drv_data {
23 struct omap_dss_device dssdev;
25 struct i2c_adapter *i2c_adapter;
27 struct gpio_desc *hpd_gpio;
29 void (*hpd_cb)(void *cb_data, enum drm_connector_status status);
32 /* mutex for hpd fields above */
33 struct mutex hpd_lock;
36 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
38 static int dvic_connect(struct omap_dss_device *src,
39 struct omap_dss_device *dst)
44 static void dvic_disconnect(struct omap_dss_device *src,
45 struct omap_dss_device *dst)
49 static int dvic_ddc_read(struct i2c_adapter *adapter,
50 unsigned char *buf, u16 count, u8 offset)
54 for (retries = 3; retries > 0; retries--) {
55 struct i2c_msg msgs[] = {
69 r = i2c_transfer(adapter, msgs, 2);
77 return r < 0 ? r : -EIO;
80 static int dvic_read_edid(struct omap_dss_device *dssdev,
83 struct panel_drv_data *ddata = to_panel_data(dssdev);
86 l = min(EDID_LENGTH, len);
87 r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
93 /* if there are extensions, read second block */
94 if (len > EDID_LENGTH && edid[0x7e] > 0) {
95 l = min(EDID_LENGTH, len - EDID_LENGTH);
97 r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
108 static bool dvic_detect(struct omap_dss_device *dssdev)
110 struct panel_drv_data *ddata = to_panel_data(dssdev);
115 return gpiod_get_value_cansleep(ddata->hpd_gpio);
117 if (!ddata->i2c_adapter)
120 r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
125 static void dvic_register_hpd_cb(struct omap_dss_device *dssdev,
126 void (*cb)(void *cb_data,
127 enum drm_connector_status status),
130 struct panel_drv_data *ddata = to_panel_data(dssdev);
132 mutex_lock(&ddata->hpd_lock);
134 ddata->hpd_cb_data = cb_data;
135 mutex_unlock(&ddata->hpd_lock);
138 static void dvic_unregister_hpd_cb(struct omap_dss_device *dssdev)
140 struct panel_drv_data *ddata = to_panel_data(dssdev);
142 mutex_lock(&ddata->hpd_lock);
143 ddata->hpd_cb = NULL;
144 ddata->hpd_cb_data = NULL;
145 mutex_unlock(&ddata->hpd_lock);
148 static const struct omap_dss_device_ops dvic_ops = {
149 .connect = dvic_connect,
150 .disconnect = dvic_disconnect,
152 .read_edid = dvic_read_edid,
153 .detect = dvic_detect,
155 .register_hpd_cb = dvic_register_hpd_cb,
156 .unregister_hpd_cb = dvic_unregister_hpd_cb,
159 static irqreturn_t dvic_hpd_isr(int irq, void *data)
161 struct panel_drv_data *ddata = data;
163 mutex_lock(&ddata->hpd_lock);
164 if (ddata->hpd_enabled && ddata->hpd_cb) {
165 enum drm_connector_status status;
167 if (dvic_detect(&ddata->dssdev))
168 status = connector_status_connected;
170 status = connector_status_disconnected;
172 ddata->hpd_cb(ddata->hpd_cb_data, status);
174 mutex_unlock(&ddata->hpd_lock);
179 static int dvic_probe_of(struct platform_device *pdev)
181 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
182 struct device_node *node = pdev->dev.of_node;
183 struct device_node *adapter_node;
184 struct i2c_adapter *adapter;
185 struct gpio_desc *gpio;
188 gpio = devm_gpiod_get_optional(&pdev->dev, "hpd", GPIOD_IN);
190 dev_err(&pdev->dev, "failed to parse HPD gpio\n");
191 return PTR_ERR(gpio);
194 ddata->hpd_gpio = gpio;
196 mutex_init(&ddata->hpd_lock);
198 if (ddata->hpd_gpio) {
199 r = devm_request_threaded_irq(&pdev->dev,
200 gpiod_to_irq(ddata->hpd_gpio), NULL, dvic_hpd_isr,
201 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
207 adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
209 adapter = of_get_i2c_adapter_by_node(adapter_node);
210 of_node_put(adapter_node);
211 if (adapter == NULL) {
212 dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
213 return -EPROBE_DEFER;
216 ddata->i2c_adapter = adapter;
222 static int dvic_probe(struct platform_device *pdev)
224 struct panel_drv_data *ddata;
225 struct omap_dss_device *dssdev;
228 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
232 platform_set_drvdata(pdev, ddata);
234 r = dvic_probe_of(pdev);
238 dssdev = &ddata->dssdev;
239 dssdev->ops = &dvic_ops;
240 dssdev->dev = &pdev->dev;
241 dssdev->type = OMAP_DISPLAY_TYPE_DVI;
242 dssdev->display = true;
243 dssdev->owner = THIS_MODULE;
244 dssdev->of_ports = BIT(0);
247 dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
248 | OMAP_DSS_DEVICE_OP_HPD;
249 if (ddata->i2c_adapter)
250 dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
251 | OMAP_DSS_DEVICE_OP_EDID;
253 omapdss_display_init(dssdev);
254 omapdss_device_register(dssdev);
259 static int __exit dvic_remove(struct platform_device *pdev)
261 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
263 omapdss_device_unregister(&ddata->dssdev);
265 i2c_put_adapter(ddata->i2c_adapter);
267 mutex_destroy(&ddata->hpd_lock);
272 static const struct of_device_id dvic_of_match[] = {
273 { .compatible = "omapdss,dvi-connector", },
277 MODULE_DEVICE_TABLE(of, dvic_of_match);
279 static struct platform_driver dvi_connector_driver = {
281 .remove = __exit_p(dvic_remove),
283 .name = "connector-dvi",
284 .of_match_table = dvic_of_match,
285 .suppress_bind_attrs = true,
289 module_platform_driver(dvi_connector_driver);
291 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
292 MODULE_DESCRIPTION("Generic DVI Connector driver");
293 MODULE_LICENSE("GPL");