From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932716AbcKHG4S (ORCPT ); Tue, 8 Nov 2016 01:56:18 -0500 Received: from mail-pf0-f172.google.com ([209.85.192.172]:36421 "EHLO mail-pf0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932336AbcKHG4Q (ORCPT ); Tue, 8 Nov 2016 01:56:16 -0500 From: Matt Ranostay To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Cc: Matt Ranostay , Attila Kinali , Marek Vasut , Luca Barbato Subject: [PATCH v2] media: i2c-polling: add i2c-polling driver Date: Mon, 7 Nov 2016 22:00:30 -0800 Message-Id: <1478584830-15695-1-git-send-email-matt@ranostay.consulting> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are several thermal sensors that only have a low-speed bus interface but output valid video data. This patchset enables support for the AMG88xx "Grid-Eye" sensor family. Cc: Attila Kinali Cc: Marek Vasut Cc: Luca Barbato Signed-off-by: Matt Ranostay --- Changes from v1: * correct i2c_polling_remove() operations * fixed delay calcuation in buffer_queue() * add include linux/slab.h drivers/media/i2c/Kconfig | 8 + drivers/media/i2c/Makefile | 1 + drivers/media/i2c/i2c-polling.c | 469 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 478 insertions(+) create mode 100644 drivers/media/i2c/i2c-polling.c diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index 2669b4bad910..6346eeecfaae 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -768,6 +768,14 @@ config VIDEO_M52790 To compile this driver as a module, choose M here: the module will be called m52790. + +config VIDEO_I2C_POLLING + tristate "I2C polling video support" + depends on VIDEO_V4L2 && I2C + select VIDEOBUF2_VMALLOC + ---help--- + Enable the I2C polling video support which supports the following: + * Panasonic AMG88xx Grid-Eye Sensors endmenu menu "Sensors used on soc_camera driver" diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index 92773b2e6225..8182ec9f66b9 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_VIDEO_LM3646) += lm3646.o obj-$(CONFIG_VIDEO_SMIAPP_PLL) += smiapp-pll.o obj-$(CONFIG_VIDEO_AK881X) += ak881x.o obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o +obj-$(CONFIG_VIDEO_I2C_POLLING) += i2c-polling.o obj-$(CONFIG_VIDEO_ML86V7667) += ml86v7667.o obj-$(CONFIG_VIDEO_OV2659) += ov2659.o obj-$(CONFIG_VIDEO_TC358743) += tc358743.o diff --git a/drivers/media/i2c/i2c-polling.c b/drivers/media/i2c/i2c-polling.c new file mode 100644 index 000000000000..807f3aa84245 --- /dev/null +++ b/drivers/media/i2c/i2c-polling.c @@ -0,0 +1,469 @@ +/* + * i2c_polling.c - Support for polling I2C video devices + * + * Copyright (C) 2016 Matt Ranostay + * + * Based on the orginal work drivers/media/parport/bw-qcam.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * Supported: + * - Panasonic AMG88xx Grid-Eye Sensors + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define I2C_POLLING_DRIVER "i2c-polling" + +struct i2c_polling_chip; + +struct i2c_polling_data { + struct i2c_client *client; + const struct i2c_polling_chip *chip; + struct mutex lock; + struct mutex queue_lock; + unsigned int last_update; + + struct v4l2_device v4l2_dev; + struct video_device vdev; + struct vb2_queue vb_vidq; +}; + +static struct v4l2_fmtdesc amg88xx_format = { + .description = "12-bit Greyscale", + .pixelformat = V4L2_PIX_FMT_Y12, +}; + +static struct v4l2_frmsize_discrete amg88xx_size = { + .width = 8, + .height = 8, +}; + +struct i2c_polling_chip { + /* video dimensions */ + struct v4l2_fmtdesc *format; + struct v4l2_frmsize_discrete *size; + + /* max frames per second */ + unsigned int max_fps; + + /* pixel buffer size */ + unsigned int buffer_size; + + /* xfer function */ + int (*xfer)(struct i2c_polling_data *data, char *buf); +}; + +enum { + AMG88XX = 0, + I2C_POLLING_CHIP_CNT, +}; + +static int amg88xx_xfer(struct i2c_polling_data *data, char *buf) +{ + struct i2c_client *client = data->client; + struct i2c_msg msg[2]; + u8 reg = 0x80; + int ret; + + msg[0].addr = client->addr; + msg[0].flags = 0; + msg[0].len = 1; + msg[0].buf = (char *) ® + + msg[1].addr = client->addr; + msg[1].flags = I2C_M_RD; + msg[1].len = data->chip->buffer_size; + msg[1].buf = (char *) buf; + + ret = i2c_transfer(client->adapter, msg, 2); + + return (ret == 2) ? 0 : -EIO; +} + +static const struct i2c_polling_chip i2c_polling_chips[I2C_POLLING_CHIP_CNT] = { + [AMG88XX] = { + .size = &amg88xx_size, + .format = &amg88xx_format, + .max_fps = 10, + .buffer_size = 128, + .xfer = &amg88xx_xfer, + }, +}; + +static const struct v4l2_file_operations i2c_polling_fops = { + .owner = THIS_MODULE, + .open = v4l2_fh_open, + .release = vb2_fop_release, + .poll = vb2_fop_poll, + .unlocked_ioctl = video_ioctl2, + .read = vb2_fop_read, + .mmap = vb2_fop_mmap, +}; + +static int queue_setup(struct vb2_queue *vq, + unsigned int *nbuffers, unsigned int *nplanes, + unsigned int sizes[], struct device *alloc_devs[]) +{ + struct i2c_polling_data *data = vb2_get_drv_priv(vq); + + if (!(*nbuffers)) + *nbuffers = 3; + + *nplanes = 1; + sizes[0] = data->chip->buffer_size; + + return 0; +} + +static void buffer_queue(struct vb2_buffer *vb) +{ + struct i2c_polling_data *data = vb2_get_drv_priv(vb->vb2_queue); + unsigned int delay = 1000 / data->chip->max_fps; + int delta; + + mutex_lock(&data->lock); + + delta = jiffies - data->last_update; + + if (delta < msecs_to_jiffies(delay)) { + int tmp = (delay - jiffies_to_msecs(delta)) * 1000; + + usleep_range(tmp, tmp + 1000); + } + data->last_update = jiffies; + + mutex_unlock(&data->lock); + + vb2_buffer_done(vb, VB2_BUF_STATE_DONE); +} + +static void buffer_finish(struct vb2_buffer *vb) +{ + struct i2c_polling_data *data = vb2_get_drv_priv(vb->vb2_queue); + void *vbuf = vb2_plane_vaddr(vb, 0); + int size = vb2_plane_size(vb, 0); + int ret; + + mutex_lock(&data->lock); + + ret = data->chip->xfer(data, vbuf); + if (ret < 0) + vb->state = VB2_BUF_STATE_ERROR; + + mutex_unlock(&data->lock); + + vb->timestamp = ktime_get_ns(); + vb2_set_plane_payload(vb, 0, ret ? 0 : size); +} + +static struct vb2_ops i2c_polling_video_qops = { + .queue_setup = queue_setup, + .buf_queue = buffer_queue, + .buf_finish = buffer_finish, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, +}; + +static int i2c_polling_querycap(struct file *file, void *priv, + struct v4l2_capability *vcap) +{ + struct i2c_polling_data *data = video_drvdata(file); + + strlcpy(vcap->driver, data->v4l2_dev.name, sizeof(vcap->driver)); + strlcpy(vcap->card, "I2C Polling Video", sizeof(vcap->card)); + + strlcpy(vcap->bus_info, "I2C:i2c-polling", sizeof(vcap->bus_info)); + vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | + V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; + vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS; + + return 0; +} + +static int i2c_polling_g_input(struct file *file, void *fh, unsigned int *inp) +{ + *inp = 0; + + return 0; +} + +static int i2c_polling_s_input(struct file *file, void *fh, unsigned int inp) +{ + return (inp > 0) ? -EINVAL : 0; +} + +static int i2c_polling_enum_input(struct file *file, void *fh, + struct v4l2_input *vin) +{ + if (vin->index > 0) + return -EINVAL; + + strlcpy(vin->name, "Camera", sizeof(vin->name)); + + vin->type = V4L2_INPUT_TYPE_CAMERA; + vin->audioset = 0; + vin->tuner = 0; + vin->std = 0; + vin->status = 0; + + return 0; +} + +static int i2c_polling_enum_fmt_vid_cap(struct file *file, void *fh, + struct v4l2_fmtdesc *fmt) +{ + struct i2c_polling_data *data = video_drvdata(file); + enum v4l2_buf_type type = fmt->type; + + if (fmt->index > 0) + return -EINVAL; + + *fmt = *data->chip->format; + fmt->type = type; + + return 0; +} + +static int i2c_polling_enum_framesizes(struct file *file, void *fh, + struct v4l2_frmsizeenum *fsize) +{ + struct i2c_polling_data *data = video_drvdata(file); + struct v4l2_frmsize_discrete *size = data->chip->size; + + /* currently only one frame size is allowed */ + if (fsize->index > 0) + return -EINVAL; + + if (fsize->pixel_format != data->chip->format->pixelformat) + return -EINVAL; + + fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE; + fsize->discrete.width = size->width; + fsize->discrete.height = size->height; + + return 0; +} + +static int i2c_polling_enum_frameintervals(struct file *file, void *priv, + struct v4l2_frmivalenum *fe) +{ + struct i2c_polling_data *data = video_drvdata(file); + struct v4l2_frmsize_discrete *size = data->chip->size; + + if (fe->index > 0) + return -EINVAL; + + if ((fe->width != size->width) || (fe->height != size->height)) + return -EINVAL; + + fe->type = V4L2_FRMIVAL_TYPE_DISCRETE; + fe->discrete.numerator = 1; + fe->discrete.denominator = data->chip->max_fps; + + return 0; +} + +static int i2c_polling_try_fmt_vid_cap(struct file *file, void *fh, + struct v4l2_format *fmt) +{ + struct i2c_polling_data *data = video_drvdata(file); + struct v4l2_pix_format *pix = &fmt->fmt.pix; + struct v4l2_frmsize_discrete *size = data->chip->size; + + pix->width = size->width; + pix->height = size->height; + pix->pixelformat = data->chip->format->pixelformat; + pix->field = V4L2_FIELD_NONE; + pix->bytesperline = pix->width * 2; + pix->sizeimage = pix->width * pix->height * 2; + pix->colorspace = V4L2_COLORSPACE_SRGB; + pix->priv = 0; + + return 0; +} + +static int i2c_polling_fmt_vid_cap(struct file *file, void *fh, + struct v4l2_format *fmt) +{ + struct i2c_polling_data *data = video_drvdata(file); + int ret = i2c_polling_try_fmt_vid_cap(file, fh, fmt); + + if (ret < 0) + return ret; + + if (vb2_is_busy(&data->vb_vidq)) + return -EBUSY; + + return 0; +} + +static int i2c_polling_g_parm(struct file *filp, void *priv, + struct v4l2_streamparm *parm) +{ + struct i2c_polling_data *data = video_drvdata(filp); + + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + parm->parm.capture.readbuffers = 3; + parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; + parm->parm.capture.timeperframe.numerator = 1; + parm->parm.capture.timeperframe.denominator = data->chip->max_fps; + + return 0; +} + +static int i2c_polling_s_parm(struct file *filp, void *priv, + struct v4l2_streamparm *parm) +{ + if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) + return -EINVAL; + + return i2c_polling_g_parm(filp, priv, parm); +} + +static const struct v4l2_ioctl_ops i2c_polling_ioctl_ops = { + .vidioc_querycap = i2c_polling_querycap, + .vidioc_g_input = i2c_polling_g_input, + .vidioc_s_input = i2c_polling_s_input, + .vidioc_enum_input = i2c_polling_enum_input, + .vidioc_enum_fmt_vid_cap = i2c_polling_enum_fmt_vid_cap, + .vidioc_enum_framesizes = i2c_polling_enum_framesizes, + .vidioc_enum_frameintervals = i2c_polling_enum_frameintervals, + .vidioc_g_fmt_vid_cap = i2c_polling_fmt_vid_cap, + .vidioc_s_fmt_vid_cap = i2c_polling_fmt_vid_cap, + .vidioc_g_parm = i2c_polling_g_parm, + .vidioc_s_parm = i2c_polling_s_parm, + .vidioc_try_fmt_vid_cap = i2c_polling_try_fmt_vid_cap, + .vidioc_reqbufs = vb2_ioctl_reqbufs, + .vidioc_create_bufs = vb2_ioctl_create_bufs, + .vidioc_prepare_buf = vb2_ioctl_prepare_buf, + .vidioc_querybuf = vb2_ioctl_querybuf, + .vidioc_qbuf = vb2_ioctl_qbuf, + .vidioc_dqbuf = vb2_ioctl_dqbuf, + .vidioc_streamon = vb2_ioctl_streamon, + .vidioc_streamoff = vb2_ioctl_streamoff, + .vidioc_log_status = v4l2_ctrl_log_status, + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, + .vidioc_unsubscribe_event = v4l2_event_unsubscribe, +}; + +static int i2c_polling_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_polling_data *data; + struct v4l2_device *v4l2_dev; + struct vb2_queue *queue; + int ret; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->chip = &i2c_polling_chips[id->driver_data]; + data->client = client; + data->last_update = jiffies; + v4l2_dev = &data->v4l2_dev; + strlcpy(v4l2_dev->name, I2C_POLLING_DRIVER, sizeof(v4l2_dev->name)); + + ret = v4l2_device_register(&client->dev, v4l2_dev); + if (ret < 0) + goto error_free_device; + + mutex_init(&data->lock); + mutex_init(&data->queue_lock); + + queue = &data->vb_vidq; + queue->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + queue->io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ; + queue->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; + queue->drv_priv = data; + queue->ops = &i2c_polling_video_qops; + queue->mem_ops = &vb2_vmalloc_memops; + + ret = vb2_queue_init(queue); + if (ret < 0) + goto error_free_device; + + data->vdev.queue = queue; + data->vdev.queue->lock = &data->queue_lock; + + strlcpy(data->vdev.name, "I2C Polling Video", sizeof(data->vdev.name)); + + data->vdev.v4l2_dev = v4l2_dev; + data->vdev.fops = &i2c_polling_fops; + data->vdev.lock = &data->lock; + data->vdev.ioctl_ops = &i2c_polling_ioctl_ops; + data->vdev.release = video_device_release_empty; + + video_set_drvdata(&data->vdev, data); + i2c_set_clientdata(client, data); + + ret = video_register_device(&data->vdev, VFL_TYPE_GRABBER, -1); + if (ret < 0) + goto error_unregister_device; + + return 0; + +error_unregister_device: + v4l2_device_unregister(v4l2_dev); + +error_free_device: + kfree(data); + + return ret; +} + +static int i2c_polling_remove(struct i2c_client *client) +{ + struct i2c_polling_data *data = i2c_get_clientdata(client); + + v4l2_device_unregister(&data->v4l2_dev); + video_unregister_device(&data->vdev); + kfree(data); + + return 0; +} + +static const struct i2c_device_id i2c_polling_id_table[] = { + { "amg88xx", AMG88XX }, + {} +}; +MODULE_DEVICE_TABLE(i2c, i2c_polling_id_table); + +static struct i2c_driver i2c_polling_driver = { + .driver = { + .name = I2C_POLLING_DRIVER, + }, + .probe = i2c_polling_probe, + .remove = i2c_polling_remove, + .id_table = i2c_polling_id_table, +}; + +module_i2c_driver(i2c_polling_driver); + +MODULE_AUTHOR("Matt Ranostay "); +MODULE_DESCRIPTION("I2C polling video support"); +MODULE_LICENSE("GPL"); -- 2.7.4