9a4825edbc
The STK1160 needs some time to transfer data to and from the AC97 codec. The transfer completion is indicated by command read/write bits in the chip's audio control register. The driver should poll these bits and wait until they have been cleared by hardware before trying to retrieve the results of a read operation or setting a new write command. [mchehab@s-opensource.com: make checkpatch happier] Signed-off-by: Marcel Hasler <mahasler@gmail.com> Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
203 lines
5 KiB
C
203 lines
5 KiB
C
/*
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* STK1160 driver
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*
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* Copyright (C) 2012 Ezequiel Garcia
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* <elezegarcia--a.t--gmail.com>
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*
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* Based on Easycap driver by R.M. Thomas
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* Copyright (C) 2010 R.M. Thomas
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* <rmthomas--a.t--sciolus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/i2c.h>
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#include <sound/core.h>
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#include <sound/ac97_codec.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#define STK1160_VERSION "0.9.5"
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#define STK1160_VERSION_NUM 0x000905
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/* Decide on number of packets for each buffer */
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#define STK1160_NUM_PACKETS 64
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/* Number of buffers for isoc transfers */
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#define STK1160_NUM_BUFS 16
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#define STK1160_MIN_BUFS 1
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/* TODO: This endpoint address should be retrieved */
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#define STK1160_EP_VIDEO 0x82
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#define STK1160_EP_AUDIO 0x81
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/* Max and min video buffers */
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#define STK1160_MIN_VIDEO_BUFFERS 8
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#define STK1160_MAX_VIDEO_BUFFERS 32
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#define STK1160_MIN_PKT_SIZE 3072
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#define STK1160_MAX_INPUT 4
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#define STK1160_SVIDEO_INPUT 4
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#define STK1160_AC97_TIMEOUT 50
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#define STK1160_I2C_TIMEOUT 100
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/* TODO: Print helpers
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* I could use dev_xxx, pr_xxx, v4l2_xxx or printk.
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* However, there isn't a solid consensus on which
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* new drivers should use.
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*
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*/
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#ifdef DEBUG
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#define stk1160_dbg(fmt, args...) \
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printk(KERN_DEBUG "stk1160: " fmt, ## args)
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#else
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#define stk1160_dbg(fmt, args...)
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#endif
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#define stk1160_info(fmt, args...) \
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pr_info("stk1160: " fmt, ## args)
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#define stk1160_warn(fmt, args...) \
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pr_warn("stk1160: " fmt, ## args)
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#define stk1160_err(fmt, args...) \
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pr_err("stk1160: " fmt, ## args)
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/* Buffer for one video frame */
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struct stk1160_buffer {
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/* common v4l buffer stuff -- must be first */
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struct vb2_v4l2_buffer vb;
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struct list_head list;
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void *mem;
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unsigned int length; /* buffer length */
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unsigned int bytesused; /* bytes written */
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int odd; /* current oddity */
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/*
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* Since we interlace two fields per frame,
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* this is different from bytesused.
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*/
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unsigned int pos; /* current pos inside buffer */
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};
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struct stk1160_isoc_ctl {
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/* max packet size of isoc transaction */
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int max_pkt_size;
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/* number of allocated urbs */
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int num_bufs;
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/* urb for isoc transfers */
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struct urb **urb;
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/* transfer buffers for isoc transfer */
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char **transfer_buffer;
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/* current buffer */
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struct stk1160_buffer *buf;
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};
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struct stk1160_fmt {
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char *name;
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u32 fourcc; /* v4l2 format id */
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int depth;
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};
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struct stk1160 {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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struct device *dev;
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struct usb_device *udev;
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/* saa7115 subdev */
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struct v4l2_subdev *sd_saa7115;
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/* isoc control struct */
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struct list_head avail_bufs;
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/* video capture */
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struct vb2_queue vb_vidq;
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/* max packet size of isoc transaction */
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int max_pkt_size;
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/* array of wMaxPacketSize */
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unsigned int *alt_max_pkt_size;
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/* alternate */
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int alt;
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/* Number of alternative settings */
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int num_alt;
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struct stk1160_isoc_ctl isoc_ctl;
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/* frame properties */
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int width; /* current frame width */
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int height; /* current frame height */
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unsigned int ctl_input; /* selected input */
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v4l2_std_id norm; /* current norm */
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struct stk1160_fmt *fmt; /* selected format */
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unsigned int sequence;
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/* i2c i/o */
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struct i2c_adapter i2c_adap;
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struct i2c_client i2c_client;
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struct mutex v4l_lock;
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struct mutex vb_queue_lock;
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spinlock_t buf_lock;
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struct file *fh_owner; /* filehandle ownership */
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/* EXPERIMENTAL */
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struct snd_card *snd_card;
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};
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struct regval {
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u16 reg;
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u16 val;
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};
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/* Provided by stk1160-v4l.c */
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int stk1160_vb2_setup(struct stk1160 *dev);
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int stk1160_video_register(struct stk1160 *dev);
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void stk1160_video_unregister(struct stk1160 *dev);
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void stk1160_clear_queue(struct stk1160 *dev);
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/* Provided by stk1160-video.c */
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int stk1160_alloc_isoc(struct stk1160 *dev);
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void stk1160_free_isoc(struct stk1160 *dev);
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void stk1160_cancel_isoc(struct stk1160 *dev);
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void stk1160_uninit_isoc(struct stk1160 *dev);
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/* Provided by stk1160-i2c.c */
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int stk1160_i2c_register(struct stk1160 *dev);
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int stk1160_i2c_unregister(struct stk1160 *dev);
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/* Provided by stk1160-core.c */
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int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value);
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int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value);
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int stk1160_write_regs_req(struct stk1160 *dev, u8 req, u16 reg,
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char *buf, int len);
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int stk1160_read_reg_req_len(struct stk1160 *dev, u8 req, u16 reg,
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char *buf, int len);
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void stk1160_select_input(struct stk1160 *dev);
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/* Provided by stk1160-ac97.c */
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void stk1160_ac97_setup(struct stk1160 *dev);
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