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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>
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/***************************************************************************
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* Plug-in for TAS5110D image sensor connected to the SN9C1xx PC Camera *
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* Controllers *
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* *
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* Copyright (C) 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 "sn9c102_sensor.h"
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static int tas5110d_init(struct sn9c102_device* cam)
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{
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int err;
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err = sn9c102_write_const_regs(cam, {0x01, 0x01}, {0x04, 0x01},
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{0x0a, 0x14}, {0x60, 0x17},
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{0x06, 0x18}, {0xfb, 0x19});
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err += sn9c102_i2c_write(cam, 0x9a, 0xca);
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return err;
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}
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static int tas5110d_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) + 69,
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v_start = (u8)(rect->top - s->cropcap.bounds.top) + 9;
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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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err += sn9c102_write_reg(cam, 0x14, 0x1a);
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err += sn9c102_write_reg(cam, 0x0a, 0x1b);
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return err;
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}
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static int tas5110d_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, 0x3b, 0x19);
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else
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err += sn9c102_write_reg(cam, 0xfb, 0x19);
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return err;
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}
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static struct sn9c102_sensor tas5110d = {
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.name = "TAS5110D",
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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_WRITE,
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.frequency = SN9C102_I2C_100KHZ,
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.interface = SN9C102_I2C_2WIRES,
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.i2c_slave_id = 0x61,
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.init = &tas5110d_init,
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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 = &tas5110d_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,
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},
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.set_pix_format = &tas5110d_set_pix_format
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};
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int sn9c102_probe_tas5110d(struct sn9c102_device* cam)
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{
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const struct usb_device_id tas5110d_id_table[] = {
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{ USB_DEVICE(0x0c45, 0x6007), },
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{ }
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};
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if (!sn9c102_match_id(cam, tas5110d_id_table))
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return -ENODEV;
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sn9c102_attach_sensor(cam, &tas5110d);
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return 0;
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}
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