62d50addf0
Before, root privileges were only needed to set hardware registers, not to read them. On some hardware, reading from the wrong place at the wrong time can hang the machine. So, to be consistent, root privileges are required to read registers on all hardware. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
255 lines
6.2 KiB
C
255 lines
6.2 KiB
C
/*
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* upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
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*
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* 2003 by T.Adachi (tadachi@tadachi-net.com)
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* 2003 by Takeru KOMORIYA <komoriya@paken.org>
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* 2006 by Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-common.h>
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#include <media/upd64083.h>
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MODULE_DESCRIPTION("uPD64083 driver");
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MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
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MODULE_LICENSE("GPL");
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static int debug = 0;
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module_param(debug, bool, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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static unsigned short normal_i2c[] = { 0xb8 >> 1, 0xba >> 1, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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enum {
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R00 = 0, R01, R02, R03, R04,
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R05, R06, R07, R08, R09,
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R0A, R0B, R0C, R0D, R0E, R0F,
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R10, R11, R12, R13, R14,
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R15, R16,
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TOT_REGS
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};
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struct upd64083_state {
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u8 mode;
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u8 ext_y_adc;
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u8 regs[TOT_REGS];
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};
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/* Initial values when used in combination with the
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NEC upd64031a ghost reduction chip. */
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static u8 upd64083_init[] = {
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0x1f, 0x01, 0xa0, 0x2d, 0x29, /* we use EXCSS=0 */
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0x36, 0xdd, 0x05, 0x56, 0x48,
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0x00, 0x3a, 0xa0, 0x05, 0x08,
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0x44, 0x60, 0x08, 0x52, 0xf8,
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0x53, 0x60, 0x10
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};
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/* ------------------------------------------------------------------------ */
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static void upd64083_log_status(struct i2c_client *client)
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{
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u8 buf[7];
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i2c_master_recv(client, buf, 7);
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v4l_info(client, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
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"SA04=%02x SA05=%02x SA06=%02x\n",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
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}
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/* ------------------------------------------------------------------------ */
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static void upd64083_write(struct i2c_client *client, u8 reg, u8 val)
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{
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u8 buf[2];
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buf[0] = reg;
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buf[1] = val;
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v4l_dbg(1, debug, client, "writing reg addr: %02x val: %02x\n", reg, val);
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if (i2c_master_send(client, buf, 2) != 2)
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v4l_err(client, "I/O error write 0x%02x/0x%02x\n", reg, val);
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}
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/* ------------------------------------------------------------------------ */
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static u8 upd64083_read(struct i2c_client *client, u8 reg)
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{
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u8 buf[7];
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if (reg >= sizeof(buf))
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return 0xff;
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i2c_master_recv(client, buf, sizeof(buf));
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return buf[reg];
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}
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#endif
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/* ------------------------------------------------------------------------ */
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static int upd64083_command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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struct upd64083_state *state = i2c_get_clientdata(client);
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struct v4l2_routing *route = arg;
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switch (cmd) {
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case VIDIOC_INT_G_VIDEO_ROUTING:
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route->input = (state->mode >> 6) | (state->ext_y_adc >> 3);
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route->output = 0;
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break;
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case VIDIOC_INT_S_VIDEO_ROUTING:
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{
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u8 r00, r02;
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if (route->input > 7 || (route->input & 6) == 6)
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return -EINVAL;
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state->mode = (route->input & 3) << 6;
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state->ext_y_adc = (route->input & UPD64083_EXT_Y_ADC) << 3;
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r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
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r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
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upd64083_write(client, R00, r00);
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upd64083_write(client, R02, r02);
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break;
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}
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case VIDIOC_LOG_STATUS:
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upd64083_log_status(client);
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break;
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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case VIDIOC_DBG_G_REGISTER:
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case VIDIOC_DBG_S_REGISTER:
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{
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struct v4l2_register *reg = arg;
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if (reg->i2c_id != I2C_DRIVERID_UPD64083)
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (cmd == VIDIOC_DBG_G_REGISTER)
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reg->val = upd64083_read(client, reg->reg & 0xff);
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else
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upd64083_write(client, reg->reg & 0xff, reg->val & 0xff);
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break;
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}
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#endif
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default:
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break;
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}
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* i2c implementation */
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static struct i2c_driver i2c_driver;
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static int upd64083_attach(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *client;
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struct upd64083_state *state;
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int i;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return 0;
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client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (client == NULL) {
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return -ENOMEM;
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}
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client->addr = address;
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client->adapter = adapter;
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client->driver = &i2c_driver;
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snprintf(client->name, sizeof(client->name) - 1, "uPD64083");
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v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
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state = kmalloc(sizeof(struct upd64083_state), GFP_KERNEL);
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if (state == NULL) {
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kfree(client);
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return -ENOMEM;
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}
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i2c_set_clientdata(client, state);
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/* Initially assume that a ghost reduction chip is present */
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state->mode = 0; /* YCS mode */
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state->ext_y_adc = (1 << 5);
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memcpy(state->regs, upd64083_init, TOT_REGS);
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for (i = 0; i < TOT_REGS; i++) {
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upd64083_write(client, i, state->regs[i]);
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}
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i2c_attach_client(client);
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return 0;
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}
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static int upd64083_probe(struct i2c_adapter *adapter)
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{
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if (adapter->class & I2C_CLASS_TV_ANALOG)
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return i2c_probe(adapter, &addr_data, upd64083_attach);
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return 0;
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}
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static int upd64083_detach(struct i2c_client *client)
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{
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int err;
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err = i2c_detach_client(client);
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if (err)
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return err;
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kfree(client);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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static struct i2c_driver i2c_driver = {
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.driver = {
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.name = "upd64083",
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},
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.id = I2C_DRIVERID_UPD64083,
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.attach_adapter = upd64083_probe,
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.detach_client = upd64083_detach,
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.command = upd64083_command,
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};
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static int __init upd64083_init_module(void)
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{
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return i2c_add_driver(&i2c_driver);
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}
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static void __exit upd64083_exit_module(void)
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{
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i2c_del_driver(&i2c_driver);
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}
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module_init(upd64083_init_module);
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module_exit(upd64083_exit_module);
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