[dce1032b] | 1 | /* video.c |
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| 2 | * |
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| 3 | * Milkymist video input driver for RTEMS |
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| 4 | * |
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| 5 | * The license and distribution terms for this file may be |
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| 6 | * found in the file LICENSE in this distribution or at |
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| 7 | * http://www.rtems.com/license/LICENSE. |
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| 8 | * |
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| 9 | * $Id$ |
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| 10 | * |
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| 11 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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| 12 | */ |
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| 13 | |
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| 14 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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| 15 | |
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| 16 | #include <stdlib.h> |
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| 17 | #include <stdio.h> |
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| 18 | #include <errno.h> |
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| 19 | #include <sys/types.h> |
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| 20 | #include <rtems.h> |
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| 21 | #include <bsp.h> |
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| 22 | #include <bsp/irq-generic.h> |
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| 23 | #include <rtems/libio.h> |
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| 24 | #include <rtems/status-checks.h> |
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| 25 | #include "../include/system_conf.h" |
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| 26 | #include "milkymist_video.h" |
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| 27 | |
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| 28 | #define DEVICE_NAME "/dev/video" |
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| 29 | #define N_BUFFERS 3 |
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| 30 | #define FRAME_W 720 |
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| 31 | #define FRAME_H 288 |
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| 32 | |
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| 33 | static bool buffers_locked[N_BUFFERS]; |
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| 34 | static void *buffers[N_BUFFERS]; |
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| 35 | static int last_buffer; |
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| 36 | static int current_buffer; |
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| 37 | |
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| 38 | static rtems_isr frame_handler(rtems_vector_number n) |
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| 39 | { |
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| 40 | int remaining_attempts; |
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| 41 | |
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| 42 | lm32_interrupt_ack(1 << MM_IRQ_VIDEOIN); |
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| 43 | |
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| 44 | last_buffer = current_buffer; |
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| 45 | |
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| 46 | /* get a new buffer */ |
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| 47 | remaining_attempts = N_BUFFERS; |
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| 48 | do { |
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| 49 | current_buffer++; |
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| 50 | if(current_buffer == N_BUFFERS) |
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| 51 | current_buffer = 0; |
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| 52 | remaining_attempts--; |
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| 53 | } while(buffers_locked[current_buffer] && (remaining_attempts > 0)); |
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| 54 | |
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| 55 | MM_WRITE(MM_BT656_BASE, (unsigned int)buffers[current_buffer]); |
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| 56 | |
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| 57 | if(buffers_locked[current_buffer]) |
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| 58 | printk("Failed to find unlocked buffer\n"); |
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| 59 | } |
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| 60 | |
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| 61 | static void i2c_delay(void) |
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| 62 | { |
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| 63 | unsigned int i; |
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| 64 | |
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| 65 | for(i=0;i<1000;i++) __asm__("nop"); |
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| 66 | } |
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| 67 | |
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| 68 | /* I2C bit-banging functions from http://en.wikipedia.org/wiki/I2c */ |
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| 69 | static unsigned int i2c_read_bit(void) |
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| 70 | { |
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| 71 | unsigned int bit; |
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| 72 | |
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| 73 | /* Let the slave drive data */ |
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| 74 | MM_WRITE(MM_BT656_I2C, 0); |
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| 75 | i2c_delay(); |
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| 76 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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| 77 | i2c_delay(); |
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| 78 | bit = MM_READ(MM_BT656_I2C) & BT656_I2C_SDAIN; |
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| 79 | i2c_delay(); |
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| 80 | MM_WRITE(MM_BT656_I2C, 0); |
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| 81 | return bit; |
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| 82 | } |
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| 83 | |
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| 84 | static void i2c_write_bit(unsigned int bit) |
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| 85 | { |
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| 86 | if(bit) { |
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| 87 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDAOUT); |
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| 88 | } else { |
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| 89 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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| 90 | } |
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| 91 | i2c_delay(); |
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| 92 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) | BT656_I2C_SDC); |
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| 93 | i2c_delay(); |
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| 94 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) & ~BT656_I2C_SDC); |
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| 95 | } |
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| 96 | |
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| 97 | static int i2c_started; |
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| 98 | |
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| 99 | static void i2c_start_cond(void) |
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| 100 | { |
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| 101 | if(i2c_started) { |
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| 102 | /* set SDA to 1 */ |
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| 103 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDAOUT); |
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| 104 | i2c_delay(); |
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| 105 | MM_WRITE(MM_BT656_I2C, MM_READ(MM_BT656_I2C) | BT656_I2C_SDC); |
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| 106 | } |
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| 107 | /* SCL is high, set SDA from 1 to 0 */ |
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| 108 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDC); |
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| 109 | i2c_delay(); |
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| 110 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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| 111 | i2c_started = 1; |
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| 112 | } |
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| 113 | |
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| 114 | static void i2c_stop_cond(void) |
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| 115 | { |
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| 116 | /* set SDA to 0 */ |
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| 117 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE); |
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| 118 | i2c_delay(); |
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| 119 | /* Clock stretching */ |
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| 120 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDAOE|BT656_I2C_SDC); |
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| 121 | /* SCL is high, set SDA from 0 to 1 */ |
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| 122 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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| 123 | i2c_delay(); |
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| 124 | i2c_started = 0; |
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| 125 | } |
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| 126 | |
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| 127 | static unsigned int i2c_write(unsigned char byte) |
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| 128 | { |
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| 129 | unsigned int bit; |
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| 130 | unsigned int ack; |
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| 131 | |
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| 132 | for(bit = 0; bit < 8; bit++) { |
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| 133 | i2c_write_bit(byte & 0x80); |
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| 134 | byte <<= 1; |
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| 135 | } |
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| 136 | ack = !i2c_read_bit(); |
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| 137 | return ack; |
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| 138 | } |
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| 139 | |
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| 140 | static unsigned char i2c_read(int ack) |
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| 141 | { |
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| 142 | unsigned char byte = 0; |
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| 143 | unsigned int bit; |
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| 144 | |
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| 145 | for(bit = 0; bit < 8; bit++) { |
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| 146 | byte <<= 1; |
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| 147 | byte |= i2c_read_bit(); |
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| 148 | } |
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| 149 | i2c_write_bit(!ack); |
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| 150 | return byte; |
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| 151 | } |
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| 152 | |
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| 153 | static unsigned char read_reg(unsigned char addr) |
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| 154 | { |
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| 155 | unsigned char r; |
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| 156 | |
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| 157 | i2c_start_cond(); |
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| 158 | i2c_write(0x40); |
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| 159 | i2c_write(addr); |
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| 160 | i2c_start_cond(); |
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| 161 | i2c_write(0x41); |
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| 162 | r = i2c_read(0); |
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| 163 | i2c_stop_cond(); |
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| 164 | |
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| 165 | return r; |
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| 166 | } |
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| 167 | |
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| 168 | static void write_reg(unsigned char addr, unsigned char val) |
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| 169 | { |
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| 170 | i2c_start_cond(); |
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| 171 | i2c_write(0x40); |
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| 172 | i2c_write(addr); |
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| 173 | i2c_write(val); |
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| 174 | i2c_stop_cond(); |
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| 175 | } |
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| 176 | |
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| 177 | static const char vreg_addr[] = { |
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| 178 | 0x1d, 0xc3, 0xc4 |
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| 179 | }; |
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| 180 | |
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| 181 | static const char vreg_dat[] = { |
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| 182 | 0x40, 0x05, 0x80 |
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| 183 | }; |
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| 184 | |
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| 185 | rtems_device_driver video_initialize( |
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| 186 | rtems_device_major_number major, |
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| 187 | rtems_device_minor_number minor, |
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| 188 | void *arg |
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| 189 | ) |
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| 190 | { |
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| 191 | rtems_status_code sc; |
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| 192 | rtems_isr_entry dummy; |
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| 193 | int i; |
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| 194 | |
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| 195 | MM_WRITE(MM_BT656_I2C, BT656_I2C_SDC); |
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| 196 | |
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| 197 | sc = rtems_io_register_name(DEVICE_NAME, major, 0); |
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| 198 | RTEMS_CHECK_SC(sc, "create video input device"); |
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| 199 | |
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| 200 | rtems_interrupt_catch(frame_handler, MM_IRQ_VIDEOIN, &dummy); |
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| 201 | bsp_interrupt_vector_enable(MM_IRQ_VIDEOIN); |
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| 202 | |
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| 203 | for(i=0;i<sizeof(vreg_addr);i++) |
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| 204 | write_reg(vreg_addr[i], vreg_dat[i]); |
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| 205 | |
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| 206 | return RTEMS_SUCCESSFUL; |
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| 207 | } |
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| 208 | |
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| 209 | rtems_device_driver video_open( |
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| 210 | rtems_device_major_number major, |
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| 211 | rtems_device_minor_number minor, |
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| 212 | void *arg |
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| 213 | ) |
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| 214 | { |
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| 215 | int i; |
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| 216 | int status; |
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| 217 | |
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| 218 | for(i=0;i<N_BUFFERS;i++) { |
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| 219 | status = posix_memalign(&buffers[i], 32, 2*FRAME_W*FRAME_H); |
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| 220 | if(status != 0) { |
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| 221 | i--; |
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| 222 | while(i > 0) { |
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| 223 | free(buffers[i]); |
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| 224 | i--; |
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| 225 | } |
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| 226 | return RTEMS_UNSATISFIED; |
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| 227 | } |
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| 228 | } |
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| 229 | |
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| 230 | last_buffer = -1; |
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| 231 | current_buffer = 0; |
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| 232 | |
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| 233 | MM_WRITE(MM_BT656_BASE, (unsigned int)buffers[current_buffer]); |
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| 234 | MM_WRITE(MM_BT656_FILTERSTATUS, BT656_FILTER_FIELD1); |
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| 235 | |
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| 236 | return RTEMS_SUCCESSFUL; |
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| 237 | } |
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| 238 | |
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| 239 | rtems_device_driver video_close( |
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| 240 | rtems_device_major_number major, |
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| 241 | rtems_device_minor_number minor, |
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| 242 | void *arg |
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| 243 | ) |
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| 244 | { |
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| 245 | int i; |
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| 246 | |
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| 247 | MM_WRITE(MM_BT656_FILTERSTATUS, 0); |
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| 248 | while(MM_READ(MM_BT656_FILTERSTATUS) & BT656_FILTER_INFRAME); |
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| 249 | for(i=0;i<N_BUFFERS;i++) |
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| 250 | free(buffers[i]); |
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| 251 | return RTEMS_SUCCESSFUL; |
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| 252 | } |
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| 253 | |
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| 254 | static void invalidate_caches(void) |
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| 255 | { |
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| 256 | volatile char *flushbase = (char *)FMLBRG_FLUSH_BASE; |
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| 257 | int i, offset; |
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| 258 | |
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| 259 | offset = 0; |
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| 260 | for (i=0;i<FMLBRG_LINE_COUNT;i++) { |
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| 261 | flushbase[offset] = 0; |
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| 262 | offset += FMLBRG_LINE_LENGTH; |
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| 263 | } |
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| 264 | __asm__ volatile( /* Invalidate Level-1 data cache */ |
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| 265 | "wcsr DCC, r0\n" |
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| 266 | "nop\n" |
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| 267 | ); |
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| 268 | } |
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| 269 | |
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[267357a] | 270 | static void set_format(int format) |
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| 271 | { |
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| 272 | switch(format) { |
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| 273 | case VIDEO_FORMAT_CVBS6: |
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| 274 | write_reg(0x00, 0x00); |
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| 275 | write_reg(0xc3, 0x05); |
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| 276 | write_reg(0xc4, 0x80); |
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| 277 | break; |
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| 278 | case VIDEO_FORMAT_CVBS5: |
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| 279 | write_reg(0x00, 0x00); |
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| 280 | write_reg(0xc3, 0x0d); |
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| 281 | write_reg(0xc4, 0x80); |
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| 282 | break; |
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| 283 | case VIDEO_FORMAT_CVBS4: |
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| 284 | write_reg(0x00, 0x00); |
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| 285 | write_reg(0xc3, 0x04); |
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| 286 | write_reg(0xc4, 0x80); |
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| 287 | break; |
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| 288 | case VIDEO_FORMAT_SVIDEO: |
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| 289 | write_reg(0x00, 0x06); |
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| 290 | write_reg(0xc3, 0xd5); |
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| 291 | write_reg(0xc4, 0x80); |
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| 292 | break; |
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| 293 | case VIDEO_FORMAT_COMPONENT: |
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| 294 | write_reg(0x00, 0x09); |
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| 295 | write_reg(0xc3, 0x45); |
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| 296 | write_reg(0xc4, 0x8d); |
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| 297 | break; |
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| 298 | } |
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| 299 | } |
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| 300 | |
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[dce1032b] | 301 | rtems_device_driver video_control( |
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| 302 | rtems_device_major_number major, |
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| 303 | rtems_device_minor_number minor, |
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| 304 | void *arg |
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| 305 | ) |
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| 306 | { |
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| 307 | rtems_libio_ioctl_args_t *args = arg; |
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| 308 | unsigned int *a = (unsigned int *)args->buffer; |
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| 309 | rtems_status_code sc; |
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| 310 | |
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| 311 | switch (args->command) { |
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| 312 | case VIDEO_BUFFER_LOCK: |
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| 313 | if (last_buffer == -1) { |
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| 314 | *a = 0; |
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| 315 | } else { |
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| 316 | bsp_interrupt_vector_disable(MM_IRQ_VIDEOIN); |
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| 317 | if(*a) invalidate_caches(); |
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| 318 | *a = (unsigned int)buffers[last_buffer]; |
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| 319 | buffers_locked[last_buffer] = true; |
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| 320 | bsp_interrupt_vector_enable(MM_IRQ_VIDEOIN); |
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| 321 | } |
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| 322 | sc = RTEMS_SUCCESSFUL; |
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| 323 | break; |
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| 324 | case VIDEO_BUFFER_UNLOCK: { |
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| 325 | int i; |
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| 326 | for(i=0;i<N_BUFFERS;i++) { |
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| 327 | if ((unsigned int)buffers[i] == (unsigned int)a) { |
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| 328 | buffers_locked[i] = false; |
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| 329 | break; |
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| 330 | } |
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| 331 | } |
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| 332 | sc = RTEMS_SUCCESSFUL; |
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| 333 | break; |
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| 334 | } |
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| 335 | |
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| 336 | case VIDEO_SET_BRIGHTNESS: |
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| 337 | write_reg(0x0a, (unsigned int)a); |
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| 338 | sc = RTEMS_SUCCESSFUL; |
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| 339 | break; |
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| 340 | case VIDEO_GET_BRIGHTNESS: |
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| 341 | *a = read_reg(0x0a); |
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| 342 | sc = RTEMS_SUCCESSFUL; |
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| 343 | break; |
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| 344 | case VIDEO_SET_CONTRAST: |
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| 345 | write_reg(0x08, (unsigned int)a); |
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| 346 | sc = RTEMS_SUCCESSFUL; |
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| 347 | break; |
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| 348 | case VIDEO_GET_CONTRAST: |
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| 349 | *a = read_reg(0x08); |
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| 350 | sc = RTEMS_SUCCESSFUL; |
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| 351 | break; |
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| 352 | case VIDEO_SET_HUE: |
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| 353 | write_reg(0x0b, (unsigned int)a); |
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| 354 | sc = RTEMS_SUCCESSFUL; |
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| 355 | break; |
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| 356 | case VIDEO_GET_HUE: |
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| 357 | *a = read_reg(0x0b); |
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| 358 | sc = RTEMS_SUCCESSFUL; |
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| 359 | break; |
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| 360 | |
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| 361 | case VIDEO_GET_SIGNAL: |
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| 362 | *a = read_reg(0x10); |
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| 363 | sc = RTEMS_SUCCESSFUL; |
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| 364 | break; |
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| 365 | |
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| 366 | case VIDEO_SET_REGISTER: |
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[267357a] | 367 | write_reg(((unsigned int)a & 0xffff0000) >> 16, |
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[dce1032b] | 368 | (unsigned int)a & 0x0000ffff); |
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| 369 | sc = RTEMS_SUCCESSFUL; |
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| 370 | break; |
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| 371 | case VIDEO_GET_REGISTER: |
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| 372 | *a = read_reg(*a); |
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| 373 | sc = RTEMS_SUCCESSFUL; |
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| 374 | break; |
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| 375 | |
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[267357a] | 376 | case VIDEO_SET_FORMAT: |
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| 377 | set_format((int)a); |
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| 378 | sc = RTEMS_SUCCESSFUL; |
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| 379 | break; |
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| 380 | |
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[dce1032b] | 381 | default: |
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| 382 | sc = RTEMS_UNSATISFIED; |
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| 383 | break; |
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| 384 | } |
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| 385 | |
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| 386 | if (sc == RTEMS_SUCCESSFUL) |
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| 387 | args->ioctl_return = 0; |
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| 388 | else |
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| 389 | args->ioctl_return = -1; |
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| 390 | |
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| 391 | return sc; |
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| 392 | } |
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