1/*
  2 * Copyright (C) 2012 Red Hat
  3 * based in parts on udlfb.c:
  4 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
  5 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
  6 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
  7 *
  8 * This file is subject to the terms and conditions of the GNU General Public
  9 * License v2. See the file COPYING in the main directory of this archive for
 10 * more details.
 11 */
 12
 13#include <drm/drmP.h>
 14#include <drm/drm_crtc.h>
 15#include <drm/drm_edid.h>
 16#include <drm/drm_crtc_helper.h>
 17#include "udl_connector.h"
 18#include "udl_drv.h"
 19
 20static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
 21							   u8 *buff)
 22{
 23	int ret, i;
 24	u8 *read_buff;
 25
 26	read_buff = kmalloc(2, GFP_KERNEL);
 27	if (!read_buff)
 28		return false;
 29
 30	for (i = 0; i < EDID_LENGTH; i++) {
 31		int bval = (i + block_idx * EDID_LENGTH) << 8;
 32		ret = usb_control_msg(udl->udev,
 33				      usb_rcvctrlpipe(udl->udev, 0),
 34					  (0x02), (0x80 | (0x02 << 5)), bval,
 35					  0xA1, read_buff, 2, HZ);
 36		if (ret < 1) {
 37			DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
 38			kfree(read_buff);
 39			return false;
 40		}
 41		buff[i] = read_buff[1];
 42	}
 43
 44	kfree(read_buff);
 45	return true;
 46}
 47
 48static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
 49			 int *result_buff_size)
 50{
 51	int i, extensions;
 52	u8 *block_buff = NULL, *buff_ptr;
 53
 54	block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
 55	if (block_buff == NULL)
 56		return false;
 57
 58	if (udl_get_edid_block(udl, 0, block_buff) &&
 59	    memchr_inv(block_buff, 0, EDID_LENGTH)) {
 60		extensions = ((struct edid *)block_buff)->extensions;
 61		if (extensions > 0) {
 62			/* we have to read all extensions one by one */
 63			*result_buff_size = EDID_LENGTH * (extensions + 1);
 64			*result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
 65			buff_ptr = *result_buff;
 66			if (buff_ptr == NULL) {
 67				kfree(block_buff);
 68				return false;
 69			}
 70			memcpy(buff_ptr, block_buff, EDID_LENGTH);
 71			kfree(block_buff);
 72			buff_ptr += EDID_LENGTH;
 73			for (i = 1; i < extensions; ++i) {
 74				if (udl_get_edid_block(udl, i, buff_ptr)) {
 75					buff_ptr += EDID_LENGTH;
 76				} else {
 77					kfree(*result_buff);
 78					*result_buff = NULL;
 79					return false;
 80				}
 81			}
 82			return true;
 83		}
 84		/* we have only base edid block */
 85		*result_buff = block_buff;
 86		*result_buff_size = EDID_LENGTH;
 87		return true;
 88	}
 89
 90	kfree(block_buff);
 91
 92	return false;
 93}
 94
 95static int udl_get_modes(struct drm_connector *connector)
 96{
 97	struct udl_drm_connector *udl_connector =
 98					container_of(connector,
 99					struct udl_drm_connector,
100					connector);
101
102	drm_mode_connector_update_edid_property(connector, udl_connector->edid);
103	if (udl_connector->edid)
104		return drm_add_edid_modes(connector, udl_connector->edid);
105	return 0;
106}
107
108static int udl_mode_valid(struct drm_connector *connector,
109			  struct drm_display_mode *mode)
110{
111	struct udl_device *udl = connector->dev->dev_private;
112	if (!udl->sku_pixel_limit)
113		return 0;
114
115	if (mode->vdisplay * mode->hdisplay > udl->sku_pixel_limit)
116		return MODE_VIRTUAL_Y;
117
118	return 0;
119}
120
121static enum drm_connector_status
122udl_detect(struct drm_connector *connector, bool force)
123{
124	u8 *edid_buff = NULL;
125	int edid_buff_size = 0;
126	struct udl_device *udl = connector->dev->dev_private;
127	struct udl_drm_connector *udl_connector =
128					container_of(connector,
129					struct udl_drm_connector,
130					connector);
131
132	/* cleanup previous edid */
133	if (udl_connector->edid != NULL) {
134		kfree(udl_connector->edid);
135		udl_connector->edid = NULL;
136	}
137
138
139	if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
140		return connector_status_disconnected;
141
142	udl_connector->edid = (struct edid *)edid_buff;
143	
144	return connector_status_connected;
145}
146
147static struct drm_encoder*
148udl_best_single_encoder(struct drm_connector *connector)
149{
150	int enc_id = connector->encoder_ids[0];
151	return drm_encoder_find(connector->dev, NULL, enc_id);
152}
153
154static int udl_connector_set_property(struct drm_connector *connector,
155				      struct drm_property *property,
156				      uint64_t val)
157{
158	return 0;
159}
160
161static void udl_connector_destroy(struct drm_connector *connector)
162{
163	struct udl_drm_connector *udl_connector =
164					container_of(connector,
165					struct udl_drm_connector,
166					connector);
167
168	drm_connector_unregister(connector);
169	drm_connector_cleanup(connector);
170	kfree(udl_connector->edid);
171	kfree(connector);
172}
173
174static const struct drm_connector_helper_funcs udl_connector_helper_funcs = {
175	.get_modes = udl_get_modes,
176	.mode_valid = udl_mode_valid,
177	.best_encoder = udl_best_single_encoder,
178};
179
180static const struct drm_connector_funcs udl_connector_funcs = {
181	.dpms = drm_helper_connector_dpms,
182	.detect = udl_detect,
183	.fill_modes = drm_helper_probe_single_connector_modes,
184	.destroy = udl_connector_destroy,
185	.set_property = udl_connector_set_property,
186};
187
188int udl_connector_init(struct drm_device *dev, struct drm_encoder *encoder)
189{
190	struct udl_drm_connector *udl_connector;
191	struct drm_connector *connector;
192
193	udl_connector = kzalloc(sizeof(struct udl_drm_connector), GFP_KERNEL);
194	if (!udl_connector)
195		return -ENOMEM;
196
197	connector = &udl_connector->connector;
198	drm_connector_init(dev, connector, &udl_connector_funcs,
199			   DRM_MODE_CONNECTOR_DVII);
200	drm_connector_helper_add(connector, &udl_connector_helper_funcs);
201
202	drm_connector_register(connector);
203	drm_mode_connector_attach_encoder(connector, encoder);
204	connector->polled = DRM_CONNECTOR_POLL_HPD |
205		DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
206
207	return 0;
208}