On Tuesday 18 May 2010 11:23:56 Zhang, Xiaolin wrote:
> From fb60254ff50703b8b8301d6708371be011f1050e Mon Sep 17 00:00:00 2001
> From: Xiaolin Zhang <xiaolin.zhang@xxxxxxxxx>
> Date: Tue, 18 May 2010 15:27:48 +0800
> Subject: [PATCH 8/8] This patch is to add National Semiconductor LM3553 flash LED driver support
> which is based on the video4linux2 sub-dev driver framework.
>
> Signed-off-by: Xiaolin Zhang <xiaolin.zhang@xxxxxxxxx>
Hmm, this driver doesn't seem to do anything. How is the flash supposed to work?
Regards,
Hans
> ---
> drivers/media/video/mrstflash.c | 151 +++++++++++++++++++++++++++++++++++++++
> 1 files changed, 151 insertions(+), 0 deletions(-)
> create mode 100644 drivers/media/video/mrstflash.c
>
> 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 <xiaolin.zhang@xxxxxxxxx>
> + */
> +
> +#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 <xiaolin.zhang@xxxxxxxxx>");
> +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);
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG, part of Cisco
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