Harald Welte | 605e3e4 | 2012-03-06 23:15:42 +0100 | [diff] [blame] | 1 | #include <stdint.h> |
| 2 | |
| 3 | #include <spi/spi.h> |
| 4 | |
| 5 | #include "idt82v2081.h" |
| 6 | |
| 7 | /* Adaption layer between idt82 driver and at91lib SPI driver */ |
| 8 | |
| 9 | #define B_READ (1 << 5) |
| 10 | |
| 11 | /* backend function for core idt82 driver */ |
| 12 | int idt82_reg_read(struct idt82 *idt, uint8_t reg) |
| 13 | { |
| 14 | uint16_t res; |
| 15 | |
| 16 | SPI_Write(idt->priv, idt->cs, (reg & 0x1F) | B_READ); |
| 17 | while (!SPI_IsFinished(idt->priv)); |
| 18 | res = SPI_Read(idt->priv, idt->cs); |
| 19 | |
| 20 | return res >> 8; |
| 21 | } |
| 22 | /* backend function for core idt82 driver */ |
| 23 | int idt82_reg_write(struct idt82 *idt, uint8_t reg, uint8_t val) |
| 24 | { |
| 25 | SPI_Write(idt->priv, idt->cs, (reg & 0x1F) | B_READ | (val << 8)); |
| 26 | |
| 27 | return 0; |
| 28 | } |
| 29 | |
| 30 | /* initialize the SPI interface to the IDT82 */ |
| 31 | int idt82_at91_init(struct idt82 *idt, void *spi, unsigned int id, |
| 32 | uint8_t cs, uint32_t spi_mr, uint32_t csr) |
| 33 | { |
| 34 | idt->priv = spi; |
| 35 | |
| 36 | SPI_Configure(spi, id, spi_mr); |
| 37 | SPI_ConfigureNCPS(spi, cs, csr); |
| 38 | SPI_Enable(spi); |
| 39 | } |