[v3,8/8] V4L2 subdev patchset for Intel Moorestown Camera Imaging Subsystem

Commit Message

Xiaolin Zhang May 18, 2010, 9:23 a.m. UTC

None

Patch

diff --git a/drivers/media/video/mrstflash.c b/drivers/media/video/mrstflash.c
new file mode 100644
index 0000000..927939b
--- /dev/null
+++ b/drivers/media/video/mrstflash.c
@@ -0,0 +1,151 @@ 
+/*
+ * Support for Moorestown Langwell Camera Imaging camera flash.
+ *
+ * Copyright (c) 2009 Intel Corporation. All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * Xiaolin Zhang <[e-mail]>
+ */
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/videodev2.h>
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+
+static int debug;
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+MODULE_AUTHOR("Xiaolin Zhang <[e-mail]>");
+MODULE_DESCRIPTION("A low-level driver for mrst flash");
+MODULE_LICENSE("GPL");
+
+static int flash_g_chip_ident(struct v4l2_subdev *sd,
+		struct v4l2_dbg_chip_ident *chip)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	#define V4L2_IDENT_MRST_FLASH 8248
+	return v4l2_chip_ident_i2c_client(client, chip,
+					  V4L2_IDENT_MRST_FLASH, 0);
+}
+
+static const struct v4l2_subdev_core_ops flash_core_ops = {
+	.g_chip_ident = flash_g_chip_ident,
+};
+static const struct v4l2_subdev_ops flash_ops = {
+	.core = &flash_core_ops,
+};
+
+static int flash_detect(struct i2c_client *client)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	u8 pid;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -ENODEV;
+
+	if (adapter->nr != 0)
+		return -ENODEV;
+
+	pid = i2c_smbus_read_byte_data(client, 0x10);
+	if (pid == 0x18) {
+		printk(KERN_ERR "camera flash device found\n");
+		v4l_dbg(1, debug, client, "found camera flash device");
+	} else {
+		printk(KERN_ERR "no camera flash device found\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int flash_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	u8 pid, ver;
+	int ret = -1;
+	struct v4l2_subdev *sd;
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n",
+			client->addr << 1, client->adapter->name);
+
+	sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
+	ret = flash_detect(client);
+	if (ret)
+		return -ENODEV;
+
+	v4l2_i2c_subdev_init(sd, client, &flash_ops);
+
+	ver = i2c_smbus_read_byte_data(client, 0x50);
+	v4l_dbg(1, debug, client, "detect:CST from device is 0x%x", ver);
+	pid = i2c_smbus_read_byte_data(client, 0x20);
+	v4l_dbg(1, debug, client, "detect:MFPC from device is 0x%x", pid);
+	pid = i2c_smbus_read_byte_data(client, 0xA0);
+	v4l_dbg(1, debug, client, "detect:TCC from device is 0x%x", pid);
+	pid = i2c_smbus_read_byte_data(client, 0xB0);
+	v4l_dbg(1, debug, client, "detect:FCC from device is 0x%x", pid);
+	pid = i2c_smbus_read_byte_data(client, 0xC0);
+	v4l_dbg(1, debug, client, "detect:FDC from device is 0x%x", pid);
+	i2c_smbus_write_byte_data(client, 0xc0, 0xff); /*set FST to 1000us*/
+	pid = i2c_smbus_read_byte_data(client, 0xc0);
+	v4l_dbg(1, debug, client, "FDC from device is 0x%x", pid);
+
+	v4l_dbg(1, debug, client,
+		"successfully load camera flash device driver");
+	return 0;
+}
+
+static int flash_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+	v4l2_device_unregister_subdev(sd);
+	kfree(sd);
+
+	return 0;
+}
+
+static const struct i2c_device_id flash_id[] = {
+	{"mrst_camera_flash", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, flash_id);
+
+static struct i2c_driver flash_i2c_driver = {
+	.driver = {
+		.name = "mrst_camera_flash",
+	},
+	.probe = flash_probe,
+	.remove = flash_remove,
+	.id_table = flash_id,
+};
+
+static int __init flash_drv_init(void)
+{
+	return i2c_add_driver(&flash_i2c_driver);
+}
+
+static void __exit flash_drv_cleanup(void)
+{
+	i2c_del_driver(&flash_i2c_driver);
+}
+
+module_init(flash_drv_init);
+module_exit(flash_drv_cleanup);