[linux-2.6-block.git] / drivers / gpu / drm / omapdrm / displays / connector-dvi.c

/*
 * Generic DVI Connector 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/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <drm/drm_edid.h>
#include <video/omap-panel-data.h>

#include "../dss/omapdss.h"

static const struct omap_video_timings dvic_default_timings = {
	.x_res		= 640,
	.y_res		= 480,

	.pixelclock	= 23500000,

	.hfp		= 48,
	.hsw		= 32,
	.hbp		= 80,

	.vfp		= 3,
	.vsw		= 4,
	.vbp		= 7,

	.vsync_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.hsync_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_FALLING_EDGE,
};

struct panel_drv_data {
	struct omap_dss_device dssdev;
	struct omap_dss_device *in;

	struct omap_video_timings timings;

	struct i2c_adapter *i2c_adapter;
};

#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)

static int dvic_connect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;
	int r;

	if (omapdss_device_is_connected(dssdev))
		return 0;

	r = in->ops.dvi->connect(in, dssdev);
	if (r)
		return r;

	return 0;
}

static void dvic_disconnect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!omapdss_device_is_connected(dssdev))
		return;

	in->ops.dvi->disconnect(in, dssdev);
}

static int dvic_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 (!omapdss_device_is_connected(dssdev))
		return -ENODEV;

	if (omapdss_device_is_enabled(dssdev))
		return 0;

	in->ops.dvi->set_timings(in, &ddata->timings);

	r = in->ops.dvi->enable(in);
	if (r)
		return r;

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

	return 0;
}

static void dvic_disable(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	struct omap_dss_device *in = ddata->in;

	if (!omapdss_device_is_enabled(dssdev))
		return;

	in->ops.dvi->disable(in);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void dvic_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.dvi->set_timings(in, timings);
}

static void dvic_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 dvic_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;

	return in->ops.dvi->check_timings(in, timings);
}

static int dvic_ddc_read(struct i2c_adapter *adapter,
		unsigned char *buf, u16 count, u8 offset)
{
	int r, retries;

	for (retries = 3; retries > 0; retries--) {
		struct i2c_msg msgs[] = {
			{
				.addr   = DDC_ADDR,
				.flags  = 0,
				.len    = 1,
				.buf    = &offset,
			}, {
				.addr   = DDC_ADDR,
				.flags  = I2C_M_RD,
				.len    = count,
				.buf    = buf,
			}
		};

		r = i2c_transfer(adapter, msgs, 2);
		if (r == 2)
			return 0;

		if (r != -EAGAIN)
			break;
	}

	return r < 0 ? r : -EIO;
}

static int dvic_read_edid(struct omap_dss_device *dssdev,
		u8 *edid, int len)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	int r, l, bytes_read;

	if (!ddata->i2c_adapter)
		return -ENODEV;

	l = min(EDID_LENGTH, len);
	r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
	if (r)
		return r;

	bytes_read = l;

	/* if there are extensions, read second block */
	if (len > EDID_LENGTH && edid[0x7e] > 0) {
		l = min(EDID_LENGTH, len - EDID_LENGTH);

		r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
				l, EDID_LENGTH);
		if (r)
			return r;

		bytes_read += l;
	}

	return bytes_read;
}

static bool dvic_detect(struct omap_dss_device *dssdev)
{
	struct panel_drv_data *ddata = to_panel_data(dssdev);
	unsigned char out;
	int r;

	if (!ddata->i2c_adapter)
		return true;

	r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);

	return r == 0;
}

static struct omap_dss_driver dvic_driver = {
	.connect	= dvic_connect,
	.disconnect	= dvic_disconnect,

	.enable		= dvic_enable,
	.disable	= dvic_disable,

	.set_timings	= dvic_set_timings,
	.get_timings	= dvic_get_timings,
	.check_timings	= dvic_check_timings,

	.get_resolution	= omapdss_default_get_resolution,

	.read_edid	= dvic_read_edid,
	.detect		= dvic_detect,
};

static int dvic_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;
	struct device_node *adapter_node;
	struct i2c_adapter *adapter;

	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;

	adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
	if (adapter_node) {
		adapter = of_get_i2c_adapter_by_node(adapter_node);
		of_node_put(adapter_node);
		if (adapter == NULL) {
			dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
			omap_dss_put_device(ddata->in);
			return -EPROBE_DEFER;
		}

		ddata->i2c_adapter = adapter;
	}

	return 0;
}

static int dvic_probe(struct platform_device *pdev)
{
	struct panel_drv_data *ddata;
	struct omap_dss_device *dssdev;
	int r;

	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
	if (!ddata)
		return -ENOMEM;

	platform_set_drvdata(pdev, ddata);

	if (!pdev->dev.of_node)
		return -ENODEV;

	r = dvic_probe_of(pdev);
	if (r)
		return r;

	ddata->timings = dvic_default_timings;

	dssdev = &ddata->dssdev;
	dssdev->driver = &dvic_driver;
	dssdev->dev = &pdev->dev;
	dssdev->type = OMAP_DISPLAY_TYPE_DVI;
	dssdev->owner = THIS_MODULE;
	dssdev->panel.timings = dvic_default_timings;

	r = omapdss_register_display(dssdev);
	if (r) {
		dev_err(&pdev->dev, "Failed to register panel\n");
		goto err_reg;
	}

	return 0;

err_reg:
	omap_dss_put_device(ddata->in);

	i2c_put_adapter(ddata->i2c_adapter);

	return r;
}

static int __exit dvic_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_display(&ddata->dssdev);

	dvic_disable(dssdev);
	dvic_disconnect(dssdev);

	omap_dss_put_device(in);

	i2c_put_adapter(ddata->i2c_adapter);

	return 0;
}

static const struct of_device_id dvic_of_match[] = {
	{ .compatible = "omapdss,dvi-connector", },
	{},
};

MODULE_DEVICE_TABLE(of, dvic_of_match);

static struct platform_driver dvi_connector_driver = {
	.probe	= dvic_probe,
	.remove	= __exit_p(dvic_remove),
	.driver	= {
		.name	= "connector-dvi",
		.of_match_table = dvic_of_match,
		.suppress_bind_attrs = true,
	},
};

module_platform_driver(dvi_connector_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("Generic DVI Connector driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
348077b1 TV	1	/*
	2	* Generic DVI Connector driver
	3	*
	4	* Copyright (C) 2013 Texas Instruments
	5	* Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
	6	*
	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.
	10	*/
	11
	12	#include <linux/i2c.h>
	13	#include <linux/module.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/slab.h>
	16
	17	#include <drm/drm_edid.h>
348077b1 TV	18	#include <video/omap-panel-data.h>
348077b1 TV	19
32043da7 PU	20	#include "../dss/omapdss.h"
32043da7 PU	21
348077b1 TV	22	static const struct omap_video_timings dvic_default_timings = {
	23	.x_res = 640,
	24	.y_res = 480,
	25
d8d78941	26	.pixelclock = 23500000,
348077b1 TV	27
	28	.hfp = 48,
	29	.hsw = 32,
	30	.hbp = 80,
	31
	32	.vfp = 3,
	33	.vsw = 4,
	34	.vbp = 7,
	35
	36	.vsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
	37	.hsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
	38	.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
	39	.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
7a16360d	40	.sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
348077b1 TV	41	};
	42
	43	struct panel_drv_data {
	44	struct omap_dss_device dssdev;
	45	struct omap_dss_device *in;
	46
	47	struct omap_video_timings timings;
	48
	49	struct i2c_adapter *i2c_adapter;
	50	};
	51
	52	#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
	53
	54	static int dvic_connect(struct omap_dss_device *dssdev)
	55	{
	56	struct panel_drv_data *ddata = to_panel_data(dssdev);
	57	struct omap_dss_device *in = ddata->in;
	58	int r;
	59
	60	if (omapdss_device_is_connected(dssdev))
	61	return 0;
	62
	63	r = in->ops.dvi->connect(in, dssdev);
	64	if (r)
	65	return r;
	66
	67	return 0;
	68	}
	69
	70	static void dvic_disconnect(struct omap_dss_device *dssdev)
	71	{
	72	struct panel_drv_data *ddata = to_panel_data(dssdev);
	73	struct omap_dss_device *in = ddata->in;
	74
	75	if (!omapdss_device_is_connected(dssdev))
	76	return;
	77
	78	in->ops.dvi->disconnect(in, dssdev);
	79	}
	80
	81	static int dvic_enable(struct omap_dss_device *dssdev)
	82	{
	83	struct panel_drv_data *ddata = to_panel_data(dssdev);
	84	struct omap_dss_device *in = ddata->in;
	85	int r;
	86
	87	if (!omapdss_device_is_connected(dssdev))
	88	return -ENODEV;
	89
	90	if (omapdss_device_is_enabled(dssdev))
	91	return 0;
	92
	93	in->ops.dvi->set_timings(in, &ddata->timings);
	94
	95	r = in->ops.dvi->enable(in);
	96	if (r)
	97	return r;
	98
	99	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
	100
	101	return 0;
	102	}
	103
	104	static void dvic_disable(struct omap_dss_device *dssdev)
105	{
106	struct panel_drv_data *ddata = to_panel_data(dssdev);
107	struct omap_dss_device *in = ddata->in;
108
109	if (!omapdss_device_is_enabled(dssdev))
110	return;
111
112	in->ops.dvi->disable(in);
113
114	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
115	}
116
117	static void dvic_set_timings(struct omap_dss_device *dssdev,
118	struct omap_video_timings *timings)
119	{
120	struct panel_drv_data *ddata = to_panel_data(dssdev);
121	struct omap_dss_device *in = ddata->in;
122
123	ddata->timings = *timings;
124	dssdev->panel.timings = *timings;
125
126	in->ops.dvi->set_timings(in, timings);
127	}
128
129	static void dvic_get_timings(struct omap_dss_device *dssdev,
130	struct omap_video_timings *timings)
131	{
132	struct panel_drv_data *ddata = to_panel_data(dssdev);
133
134	*timings = ddata->timings;
135	}
136
137	static int dvic_check_timings(struct omap_dss_device *dssdev,
138	struct omap_video_timings *timings)
139	{
140	struct panel_drv_data *ddata = to_panel_data(dssdev);
141	struct omap_dss_device *in = ddata->in;
142
143	return in->ops.dvi->check_timings(in, timings);
144	}
145
146	static int dvic_ddc_read(struct i2c_adapter *adapter,
147	unsigned char *buf, u16 count, u8 offset)
148	{
149	int r, retries;
150
151	for (retries = 3; retries > 0; retries--) {
152	struct i2c_msg msgs[] = {
153	{
154	.addr = DDC_ADDR,
155	.flags = 0,
156	.len = 1,
157	.buf = &offset,
158	}, {
159	.addr = DDC_ADDR,
160	.flags = I2C_M_RD,
161	.len = count,
162	.buf = buf,
163	}
164	};
165
166	r = i2c_transfer(adapter, msgs, 2);
167	if (r == 2)
168	return 0;
169
170	if (r != -EAGAIN)
171	break;
172	}
173
174	return r < 0 ? r : -EIO;
175	}
176
177	static int dvic_read_edid(struct omap_dss_device *dssdev,
178	u8 *edid, int len)
179	{
180	struct panel_drv_data *ddata = to_panel_data(dssdev);
181	int r, l, bytes_read;
182
183	if (!ddata->i2c_adapter)
184	return -ENODEV;
185
186	l = min(EDID_LENGTH, len);
187	r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
188	if (r)
189	return r;
190
191	bytes_read = l;
192
193	/* if there are extensions, read second block */
194	if (len > EDID_LENGTH && edid[0x7e] > 0) {
195	l = min(EDID_LENGTH, len - EDID_LENGTH);
196
197	r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
198	l, EDID_LENGTH);
199	if (r)
200	return r;
201
202	bytes_read += l;
203	}
204
205	return bytes_read;
206	}
207
208	static bool dvic_detect(struct omap_dss_device *dssdev)
209	{
210	struct panel_drv_data *ddata = to_panel_data(dssdev);
211	unsigned char out;
212	int r;
213
214	if (!ddata->i2c_adapter)
215	return true;
216
217	r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
218
219	return r == 0;
220	}
221
222	static struct omap_dss_driver dvic_driver = {
223	.connect = dvic_connect,
224	.disconnect = dvic_disconnect,
225
226	.enable = dvic_enable,
227	.disable = dvic_disable,
228
229	.set_timings = dvic_set_timings,
230	.get_timings = dvic_get_timings,
231	.check_timings = dvic_check_timings,
232
233	.get_resolution = omapdss_default_get_resolution,
234
235	.read_edid = dvic_read_edid,
236	.detect = dvic_detect,
237	};
238
2cbe2304 TV	239	static int dvic_probe_of(struct platform_device *pdev)
	240	{
	241	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	242	struct device_node *node = pdev->dev.of_node;
	243	struct omap_dss_device *in;
	244	struct device_node *adapter_node;
	245	struct i2c_adapter *adapter;
	246
	247	in = omapdss_of_find_source_for_first_ep(node);
	248	if (IS_ERR(in)) {
	249	dev_err(&pdev->dev, "failed to find video source\n");
	250	return PTR_ERR(in);
	251	}
	252
	253	ddata->in = in;
	254
	255	adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
	256	if (adapter_node) {
ad38cc5f	257	adapter = of_get_i2c_adapter_by_node(adapter_node);
0697a05f	258	of_node_put(adapter_node);
2cbe2304 TV	259	if (adapter == NULL) {
	260	dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
	261	omap_dss_put_device(ddata->in);
	262	return -EPROBE_DEFER;
	263	}
	264
	265	ddata->i2c_adapter = adapter;
	266	}
	267
	268	return 0;
	269	}
	270
348077b1 TV	271	static int dvic_probe(struct platform_device *pdev)
	272	{
	273	struct panel_drv_data *ddata;
	274	struct omap_dss_device *dssdev;
	275	int r;
	276
	277	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
	278	if (!ddata)
	279	return -ENOMEM;
	280
	281	platform_set_drvdata(pdev, ddata);
	282
55f6fca3	283	if (!pdev->dev.of_node)
348077b1	284	return -ENODEV;
a0d56d7e TV	285
	286	r = dvic_probe_of(pdev);
	287	if (r)
	288	return r;
348077b1 TV	289
	290	ddata->timings = dvic_default_timings;
	291
	292	dssdev = &ddata->dssdev;
	293	dssdev->driver = &dvic_driver;
	294	dssdev->dev = &pdev->dev;
	295	dssdev->type = OMAP_DISPLAY_TYPE_DVI;
	296	dssdev->owner = THIS_MODULE;
	297	dssdev->panel.timings = dvic_default_timings;
	298
	299	r = omapdss_register_display(dssdev);
	300	if (r) {
	301	dev_err(&pdev->dev, "Failed to register panel\n");
	302	goto err_reg;
	303	}
	304
	305	return 0;
	306
	307	err_reg:
	308	omap_dss_put_device(ddata->in);
cc9fd77c	309
bc500d6e	310	i2c_put_adapter(ddata->i2c_adapter);
cc9fd77c	311
348077b1 TV	312	return r;
	313	}
	314
	315	static int __exit dvic_remove(struct platform_device *pdev)
	316	{
	317	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
	318	struct omap_dss_device *dssdev = &ddata->dssdev;
	319	struct omap_dss_device *in = ddata->in;
	320
	321	omapdss_unregister_display(&ddata->dssdev);
	322
	323	dvic_disable(dssdev);
	324	dvic_disconnect(dssdev);
	325
	326	omap_dss_put_device(in);
	327
bc500d6e	328	i2c_put_adapter(ddata->i2c_adapter);
348077b1 TV	329
	330	return 0;
	331	}
	332
2cbe2304 TV	333	static const struct of_device_id dvic_of_match[] = {
	334	{ .compatible = "omapdss,dvi-connector", },
	335	{},
	336	};
	337
	338	MODULE_DEVICE_TABLE(of, dvic_of_match);
	339
348077b1 TV	340	static struct platform_driver dvi_connector_driver = {
	341	.probe = dvic_probe,
	342	.remove = __exit_p(dvic_remove),
	343	.driver = {
	344	.name = "connector-dvi",
2cbe2304	345	.of_match_table = dvic_of_match,
422ccbd5	346	.suppress_bind_attrs = true,
348077b1 TV	347	},
	348	};
	349
	350	module_platform_driver(dvi_connector_driver);
	351
	352	MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
	353	MODULE_DESCRIPTION("Generic DVI Connector driver");
	354	MODULE_LICENSE("GPL");