c680dd6038
There were many places in the driver which had long sequences of constant register initializations. These were done with one function call per register. The register address and value were immediate values in the function calls. This is very inefficient, as each register and value take twice the space when they are code, as each includes a push instruction to put it on the stack. There there is the overhead, both size and time, for a function call for each register. It's also quite a few lines of C code to do this. The patch creates a function that writes multiple registers from a list, and a macro that makes it easy to construct a such a list as a const static local to send to the function. This gets rid of quite a bit of C code, and shrinks the driver by around 8k, while at the same time being more efficient. Acked-by: Luca Risolia <luca.risolia@studio.unibo.it> Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
304 lines
7.9 KiB
C
304 lines
7.9 KiB
C
/***************************************************************************
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* Plug-in for PAS106B image sensor connected to the SN9C1xx PC Camera *
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* Controllers *
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* *
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* Copyright (C) 2004-2007 by Luca Risolia <luca.risolia@studio.unibo.it> *
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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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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software *
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
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***************************************************************************/
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#include <linux/delay.h>
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#include "sn9c102_sensor.h"
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static int pas106b_init(struct sn9c102_device* cam)
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{
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int err = 0;
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err = sn9c102_write_const_regs(cam, {0x00, 0x10}, {0x00, 0x11},
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{0x00, 0x14}, {0x20, 0x17},
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{0x20, 0x19}, {0x09, 0x18});
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err += sn9c102_i2c_write(cam, 0x02, 0x0c);
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err += sn9c102_i2c_write(cam, 0x05, 0x5a);
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err += sn9c102_i2c_write(cam, 0x06, 0x88);
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err += sn9c102_i2c_write(cam, 0x07, 0x80);
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err += sn9c102_i2c_write(cam, 0x10, 0x06);
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err += sn9c102_i2c_write(cam, 0x11, 0x06);
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err += sn9c102_i2c_write(cam, 0x12, 0x00);
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err += sn9c102_i2c_write(cam, 0x14, 0x02);
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err += sn9c102_i2c_write(cam, 0x13, 0x01);
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msleep(400);
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return err;
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}
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static int pas106b_get_ctrl(struct sn9c102_device* cam,
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struct v4l2_control* ctrl)
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{
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switch (ctrl->id) {
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case V4L2_CID_EXPOSURE:
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{
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int r1 = sn9c102_i2c_read(cam, 0x03),
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r2 = sn9c102_i2c_read(cam, 0x04);
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if (r1 < 0 || r2 < 0)
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return -EIO;
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ctrl->value = (r1 << 4) | (r2 & 0x0f);
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}
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return 0;
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case V4L2_CID_RED_BALANCE:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x0c)) < 0)
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return -EIO;
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ctrl->value &= 0x1f;
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return 0;
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case V4L2_CID_BLUE_BALANCE:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x09)) < 0)
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return -EIO;
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ctrl->value &= 0x1f;
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return 0;
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case V4L2_CID_GAIN:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x0e)) < 0)
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return -EIO;
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ctrl->value &= 0x1f;
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return 0;
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case V4L2_CID_CONTRAST:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x0f)) < 0)
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return -EIO;
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ctrl->value &= 0x07;
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return 0;
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case SN9C102_V4L2_CID_GREEN_BALANCE:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x0a)) < 0)
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return -EIO;
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ctrl->value = (ctrl->value & 0x1f) << 1;
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return 0;
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case SN9C102_V4L2_CID_DAC_MAGNITUDE:
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if ((ctrl->value = sn9c102_i2c_read(cam, 0x08)) < 0)
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return -EIO;
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ctrl->value &= 0xf8;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int pas106b_set_ctrl(struct sn9c102_device* cam,
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const struct v4l2_control* ctrl)
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{
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int err = 0;
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switch (ctrl->id) {
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case V4L2_CID_EXPOSURE:
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err += sn9c102_i2c_write(cam, 0x03, ctrl->value >> 4);
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err += sn9c102_i2c_write(cam, 0x04, ctrl->value & 0x0f);
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break;
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case V4L2_CID_RED_BALANCE:
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err += sn9c102_i2c_write(cam, 0x0c, ctrl->value);
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break;
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case V4L2_CID_BLUE_BALANCE:
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err += sn9c102_i2c_write(cam, 0x09, ctrl->value);
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break;
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case V4L2_CID_GAIN:
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err += sn9c102_i2c_write(cam, 0x0e, ctrl->value);
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break;
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case V4L2_CID_CONTRAST:
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err += sn9c102_i2c_write(cam, 0x0f, ctrl->value);
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break;
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case SN9C102_V4L2_CID_GREEN_BALANCE:
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err += sn9c102_i2c_write(cam, 0x0a, ctrl->value >> 1);
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err += sn9c102_i2c_write(cam, 0x0b, ctrl->value >> 1);
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break;
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case SN9C102_V4L2_CID_DAC_MAGNITUDE:
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err += sn9c102_i2c_write(cam, 0x08, ctrl->value << 3);
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break;
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default:
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return -EINVAL;
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}
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err += sn9c102_i2c_write(cam, 0x13, 0x01);
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return err ? -EIO : 0;
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}
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static int pas106b_set_crop(struct sn9c102_device* cam,
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const struct v4l2_rect* rect)
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{
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struct sn9c102_sensor* s = sn9c102_get_sensor(cam);
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int err = 0;
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u8 h_start = (u8)(rect->left - s->cropcap.bounds.left) + 4,
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v_start = (u8)(rect->top - s->cropcap.bounds.top) + 3;
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err += sn9c102_write_reg(cam, h_start, 0x12);
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err += sn9c102_write_reg(cam, v_start, 0x13);
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return err;
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}
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static int pas106b_set_pix_format(struct sn9c102_device* cam,
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const struct v4l2_pix_format* pix)
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{
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int err = 0;
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if (pix->pixelformat == V4L2_PIX_FMT_SN9C10X)
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err += sn9c102_write_reg(cam, 0x2c, 0x17);
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else
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err += sn9c102_write_reg(cam, 0x20, 0x17);
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return err;
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}
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static struct sn9c102_sensor pas106b = {
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.name = "PAS106B",
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.maintainer = "Luca Risolia <luca.risolia@studio.unibo.it>",
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.supported_bridge = BRIDGE_SN9C101 | BRIDGE_SN9C102,
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.sysfs_ops = SN9C102_I2C_READ | SN9C102_I2C_WRITE,
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.frequency = SN9C102_I2C_400KHZ | SN9C102_I2C_100KHZ,
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.interface = SN9C102_I2C_2WIRES,
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.i2c_slave_id = 0x40,
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.init = &pas106b_init,
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.qctrl = {
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{
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.id = V4L2_CID_EXPOSURE,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "exposure",
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.minimum = 0x125,
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.maximum = 0xfff,
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.step = 0x001,
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.default_value = 0x140,
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.flags = 0,
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},
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{
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.id = V4L2_CID_GAIN,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "global gain",
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.minimum = 0x00,
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.maximum = 0x1f,
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.step = 0x01,
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.default_value = 0x0d,
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.flags = 0,
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},
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{
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.id = V4L2_CID_CONTRAST,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "contrast",
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.minimum = 0x00,
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.maximum = 0x07,
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.step = 0x01,
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.default_value = 0x00, /* 0x00~0x03 have same effect */
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.flags = 0,
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},
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{
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.id = V4L2_CID_RED_BALANCE,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "red balance",
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.minimum = 0x00,
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.maximum = 0x1f,
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.step = 0x01,
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.default_value = 0x04,
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.flags = 0,
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},
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{
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.id = V4L2_CID_BLUE_BALANCE,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "blue balance",
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.minimum = 0x00,
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.maximum = 0x1f,
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.step = 0x01,
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.default_value = 0x06,
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.flags = 0,
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},
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{
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.id = SN9C102_V4L2_CID_GREEN_BALANCE,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "green balance",
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.minimum = 0x00,
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.maximum = 0x3e,
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.step = 0x02,
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.default_value = 0x02,
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.flags = 0,
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},
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{
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.id = SN9C102_V4L2_CID_DAC_MAGNITUDE,
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.type = V4L2_CTRL_TYPE_INTEGER,
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.name = "DAC magnitude",
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.minimum = 0x00,
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.maximum = 0x1f,
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.step = 0x01,
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.default_value = 0x01,
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.flags = 0,
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},
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},
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.get_ctrl = &pas106b_get_ctrl,
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.set_ctrl = &pas106b_set_ctrl,
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.cropcap = {
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.bounds = {
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.left = 0,
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.top = 0,
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.width = 352,
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.height = 288,
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},
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.defrect = {
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.left = 0,
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.top = 0,
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.width = 352,
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.height = 288,
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},
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},
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.set_crop = &pas106b_set_crop,
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.pix_format = {
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.width = 352,
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.height = 288,
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.pixelformat = V4L2_PIX_FMT_SBGGR8,
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.priv = 8, /* we use this field as 'bits per pixel' */
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},
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.set_pix_format = &pas106b_set_pix_format
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};
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int sn9c102_probe_pas106b(struct sn9c102_device* cam)
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{
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int r0 = 0, r1 = 0, err;
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unsigned int pid = 0;
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/*
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Minimal initialization to enable the I2C communication
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NOTE: do NOT change the values!
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*/
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err = sn9c102_write_const_regs(cam,
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{0x01, 0x01}, /* sensor power down */
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{0x00, 0x01}, /* sensor power on */
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{0x28, 0x17});/* sensor clock 24 MHz */
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if (err)
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return -EIO;
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r0 = sn9c102_i2c_try_read(cam, &pas106b, 0x00);
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r1 = sn9c102_i2c_try_read(cam, &pas106b, 0x01);
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if (r0 < 0 || r1 < 0)
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return -EIO;
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pid = (r0 << 11) | ((r1 & 0xf0) >> 4);
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if (pid != 0x007)
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return -ENODEV;
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sn9c102_attach_sensor(cam, &pas106b);
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return 0;
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}
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