379 lines
8.7 KiB
C
379 lines
8.7 KiB
C
/*
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* indycam.c - Silicon Graphics IndyCam digital camera driver
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*
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* Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
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* Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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/* IndyCam decodes stream of photons into digital image representation ;-) */
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#include <linux/videodev2.h>
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#include <linux/i2c.h>
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#include <media/v4l2-device.h>
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#include "indycam.h"
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#define INDYCAM_MODULE_VERSION "0.0.5"
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MODULE_DESCRIPTION("SGI IndyCam driver");
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MODULE_VERSION(INDYCAM_MODULE_VERSION);
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MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
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MODULE_LICENSE("GPL");
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// #define INDYCAM_DEBUG
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#ifdef INDYCAM_DEBUG
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#define dprintk(x...) printk("IndyCam: " x);
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#define indycam_regdump(client) indycam_regdump_debug(client)
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#else
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#define dprintk(x...)
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#define indycam_regdump(client)
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#endif
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struct indycam {
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struct v4l2_subdev sd;
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u8 version;
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};
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static inline struct indycam *to_indycam(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct indycam, sd);
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}
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static const u8 initseq[] = {
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INDYCAM_CONTROL_AGCENA, /* INDYCAM_CONTROL */
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INDYCAM_SHUTTER_60, /* INDYCAM_SHUTTER */
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INDYCAM_GAIN_DEFAULT, /* INDYCAM_GAIN */
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0x00, /* INDYCAM_BRIGHTNESS (read-only) */
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INDYCAM_RED_BALANCE_DEFAULT, /* INDYCAM_RED_BALANCE */
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INDYCAM_BLUE_BALANCE_DEFAULT, /* INDYCAM_BLUE_BALANCE */
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INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
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INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
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};
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/* IndyCam register handling */
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static int indycam_read_reg(struct v4l2_subdev *sd, u8 reg, u8 *value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int ret;
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if (reg == INDYCAM_REG_RESET) {
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dprintk("indycam_read_reg(): "
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"skipping write-only register %d\n", reg);
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*value = 0;
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return 0;
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}
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0) {
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printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
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"register = 0x%02x\n", reg);
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return ret;
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}
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*value = (u8)ret;
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return 0;
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}
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static int indycam_write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int err;
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if (reg == INDYCAM_REG_BRIGHTNESS || reg == INDYCAM_REG_VERSION) {
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dprintk("indycam_write_reg(): "
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"skipping read-only register %d\n", reg);
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return 0;
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}
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dprintk("Writing Reg %d = 0x%02x\n", reg, value);
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err = i2c_smbus_write_byte_data(client, reg, value);
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if (err) {
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printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
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"register = 0x%02x, value = 0x%02x\n", reg, value);
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}
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return err;
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}
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static int indycam_write_block(struct v4l2_subdev *sd, u8 reg,
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u8 length, u8 *data)
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{
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int i, err;
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for (i = 0; i < length; i++) {
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err = indycam_write_reg(sd, reg + i, data[i]);
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if (err)
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return err;
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}
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return 0;
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}
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/* Helper functions */
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#ifdef INDYCAM_DEBUG
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static void indycam_regdump_debug(struct v4l2_subdev *sd)
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{
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int i;
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u8 val;
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for (i = 0; i < 9; i++) {
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indycam_read_reg(sd, i, &val);
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dprintk("Reg %d = 0x%02x\n", i, val);
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}
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}
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#endif
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static int indycam_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
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{
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struct indycam *camera = to_indycam(sd);
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u8 reg;
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int ret = 0;
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switch (ctrl->id) {
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case V4L2_CID_AUTOGAIN:
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case V4L2_CID_AUTO_WHITE_BALANCE:
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ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, ®);
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if (ret)
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return -EIO;
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if (ctrl->id == V4L2_CID_AUTOGAIN)
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ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
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? 1 : 0;
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else
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ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
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? 1 : 0;
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break;
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case V4L2_CID_EXPOSURE:
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ret = indycam_read_reg(sd, INDYCAM_REG_SHUTTER, ®);
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if (ret)
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return -EIO;
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ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
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break;
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case V4L2_CID_GAIN:
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ret = indycam_read_reg(sd, INDYCAM_REG_GAIN, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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break;
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case V4L2_CID_RED_BALANCE:
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ret = indycam_read_reg(sd, INDYCAM_REG_RED_BALANCE, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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break;
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case V4L2_CID_BLUE_BALANCE:
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ret = indycam_read_reg(sd, INDYCAM_REG_BLUE_BALANCE, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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break;
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case INDYCAM_CONTROL_RED_SATURATION:
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ret = indycam_read_reg(sd,
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INDYCAM_REG_RED_SATURATION, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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break;
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case INDYCAM_CONTROL_BLUE_SATURATION:
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ret = indycam_read_reg(sd,
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INDYCAM_REG_BLUE_SATURATION, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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break;
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case V4L2_CID_GAMMA:
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if (camera->version == CAMERA_VERSION_MOOSE) {
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ret = indycam_read_reg(sd,
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INDYCAM_REG_GAMMA, ®);
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if (ret)
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return -EIO;
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ctrl->value = (s32)reg;
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} else {
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ctrl->value = INDYCAM_GAMMA_DEFAULT;
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}
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int indycam_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
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{
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struct indycam *camera = to_indycam(sd);
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u8 reg;
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int ret = 0;
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switch (ctrl->id) {
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case V4L2_CID_AUTOGAIN:
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case V4L2_CID_AUTO_WHITE_BALANCE:
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ret = indycam_read_reg(sd, INDYCAM_REG_CONTROL, ®);
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if (ret)
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break;
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if (ctrl->id == V4L2_CID_AUTOGAIN) {
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if (ctrl->value)
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reg |= INDYCAM_CONTROL_AGCENA;
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else
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reg &= ~INDYCAM_CONTROL_AGCENA;
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} else {
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if (ctrl->value)
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reg |= INDYCAM_CONTROL_AWBCTL;
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else
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reg &= ~INDYCAM_CONTROL_AWBCTL;
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}
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ret = indycam_write_reg(sd, INDYCAM_REG_CONTROL, reg);
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break;
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case V4L2_CID_EXPOSURE:
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reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
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ret = indycam_write_reg(sd, INDYCAM_REG_SHUTTER, reg);
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break;
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case V4L2_CID_GAIN:
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ret = indycam_write_reg(sd, INDYCAM_REG_GAIN, ctrl->value);
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break;
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case V4L2_CID_RED_BALANCE:
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ret = indycam_write_reg(sd, INDYCAM_REG_RED_BALANCE,
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ctrl->value);
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break;
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case V4L2_CID_BLUE_BALANCE:
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ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_BALANCE,
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ctrl->value);
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break;
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case INDYCAM_CONTROL_RED_SATURATION:
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ret = indycam_write_reg(sd, INDYCAM_REG_RED_SATURATION,
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ctrl->value);
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break;
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case INDYCAM_CONTROL_BLUE_SATURATION:
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ret = indycam_write_reg(sd, INDYCAM_REG_BLUE_SATURATION,
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ctrl->value);
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break;
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case V4L2_CID_GAMMA:
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if (camera->version == CAMERA_VERSION_MOOSE) {
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ret = indycam_write_reg(sd, INDYCAM_REG_GAMMA,
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ctrl->value);
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}
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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/* I2C-interface */
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops indycam_core_ops = {
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.g_ctrl = indycam_g_ctrl,
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.s_ctrl = indycam_s_ctrl,
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};
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static const struct v4l2_subdev_ops indycam_ops = {
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.core = &indycam_core_ops,
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};
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static int indycam_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int err = 0;
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struct indycam *camera;
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struct v4l2_subdev *sd;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
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if (!camera)
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return -ENOMEM;
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sd = &camera->sd;
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v4l2_i2c_subdev_init(sd, client, &indycam_ops);
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camera->version = i2c_smbus_read_byte_data(client,
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INDYCAM_REG_VERSION);
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if (camera->version != CAMERA_VERSION_INDY &&
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camera->version != CAMERA_VERSION_MOOSE) {
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kfree(camera);
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return -ENODEV;
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}
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printk(KERN_INFO "IndyCam v%d.%d detected\n",
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INDYCAM_VERSION_MAJOR(camera->version),
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INDYCAM_VERSION_MINOR(camera->version));
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indycam_regdump(sd);
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// initialize
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err = indycam_write_block(sd, 0, sizeof(initseq), (u8 *)&initseq);
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if (err) {
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printk(KERN_ERR "IndyCam initialization failed\n");
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kfree(camera);
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return -EIO;
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}
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indycam_regdump(sd);
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// white balance
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err = indycam_write_reg(sd, INDYCAM_REG_CONTROL,
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INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
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if (err) {
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printk(KERN_ERR "IndyCam: White balancing camera failed\n");
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kfree(camera);
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return -EIO;
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}
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indycam_regdump(sd);
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printk(KERN_INFO "IndyCam initialized\n");
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return 0;
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}
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static int indycam_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(to_indycam(sd));
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return 0;
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}
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static const struct i2c_device_id indycam_id[] = {
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{ "indycam", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, indycam_id);
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static struct i2c_driver indycam_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "indycam",
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},
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.probe = indycam_probe,
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.remove = indycam_remove,
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.id_table = indycam_id,
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};
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module_i2c_driver(indycam_driver);
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