diff options
author | Erik Gilling <konkers@android.com> | 2010-08-23 21:36:56 -0700 |
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committer | Dan Willemsen <dwillemsen@nvidia.com> | 2011-11-30 21:35:17 -0800 |
commit | a1bf40ca804191432f8142d74909cc474b20232d (patch) | |
tree | 880c81efc0010929d149766ad4ed1a9a2c0a0714 /drivers/video/tegra/dc/edid.c | |
parent | 2c52948eed082c7a15c716378f67e096a6c85b77 (diff) |
video: tegra: add hdmi output support
Signed-off-by: Erik Gilling <konkers@android.com>
Diffstat (limited to 'drivers/video/tegra/dc/edid.c')
-rw-r--r-- | drivers/video/tegra/dc/edid.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/video/tegra/dc/edid.c b/drivers/video/tegra/dc/edid.c new file mode 100644 index 000000000000..0b0b1a760a4e --- /dev/null +++ b/drivers/video/tegra/dc/edid.c @@ -0,0 +1,109 @@ +/* + * drivers/video/tegra/dc/edid.c + * + * Copyright (C) 2010 Google, Inc. + * Author: Erik Gilling <konkers@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/i2c.h> +#include <linux/fb.h> + +#include "edid.h" + +int tegra_edid_get_monspecs(struct tegra_edid *edid, struct fb_monspecs *specs) +{ + u8 data[256]; + int i; + int ret; + + for (i = 0; i < 256; i++) { + ret = i2c_smbus_read_byte_data(edid->client, i); + if (ret < 0) + break; + + data[i] = ret; + } + + if (i != 128 && i != 256) + return ret; + + fb_edid_to_monspecs(data, specs); + if (i == 256) + fb_edid_add_monspecs(data + 128, specs); + + return 0; +} + +struct tegra_edid *tegra_edid_create(int bus) +{ + struct tegra_edid *edid; + struct i2c_adapter *adapter; + + edid = kzalloc(sizeof(struct tegra_edid), GFP_KERNEL); + if (!edid) + return ERR_PTR(-ENOMEM); + + strlcpy(edid->info.type, "tegra_edid", sizeof(edid->info.type)); + edid->info.addr = 0x50; + edid->info.platform_data = edid; + init_waitqueue_head(&edid->wq); + + adapter = i2c_get_adapter(bus); + if (!adapter) { + pr_err("can't get adpater for bus %d\n", bus); + return NULL; + } + edid->client = i2c_new_device(adapter, &edid->info); + + i2c_put_adapter(adapter); + + if (!edid->client) { + pr_err("can't create new device\n"); + return NULL; + } + + return edid; +} + +void tegra_edid_destroy(struct tegra_edid *edid) +{ + i2c_release_client(edid->client); + kfree(edid); +} + +static const struct i2c_device_id tegra_edid_id[] = { + { "tegra_edid", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, tegra_edid_id); + +static struct i2c_driver tegra_edid_driver = { + .id_table = tegra_edid_id, + .driver = { + .name = "tegra_edid", + }, +}; + +static int __init tegra_edid_init(void) +{ + return i2c_add_driver(&tegra_edid_driver); +} + +static void __exit tegra_edid_exit(void) +{ + i2c_del_driver(&tegra_edid_driver); +} + +module_init(tegra_edid_init); +module_exit(tegra_edid_exit); |