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add some glue code between the idt82 driver and at91lib SPI

This commit is contained in:
Harald Welte 2012-03-06 23:15:42 +01:00
parent 638afbb89b
commit 605e3e459f
3 changed files with 63 additions and 0 deletions
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18
driver/idt82v2081.c
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@ -3,6 +3,24 @@
#include "idt82v2081.h"
#include "idt82v2081_regs.h"
/*! \brief Set or clear some (masked) bits inside a register
* \param[in] e4k reference to the tuner
* \param[in] reg number of the register
* \param[in] mask bit-mask of the value
* \param[in] val data value to be written to register
* \returns 0 on success, negative in case of error
*/
static int idt82_reg_set_bit_mask(struct idt82 *idt, uint8_t reg,
uint8_t mask, uint8_t val)
{
uint8_t tmp = idt82_reg_read(idt, reg);
if ((tmp & mask) == val)
return 0;
return idt82_reg_write(idt, reg, (tmp & ~mask) | (val & mask));
}
int idt82_termination(struct idt82 *idt, enum idt82_term term)
{
idt82_reg_set_bit_mask(IDT_REG_TERM, term | (term << IDT_TERM_T_SHIFT),

6
driver/idt82v2081.h
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@ -18,6 +18,8 @@ enum idt82_mode {
struct idt82 {
enum idt82_mode mode;
enum idt82_term term;
void *priv;
uint8_t cs;
};
int idt82_termination(struct idt82 *idt, enum idt82_term term);
@ -30,4 +32,8 @@ int idt82_init(struct idt82 *idt);
int idt82_reg_write(struct idt82 *idt, uint8_t reg, uin8_t val);
int idt82_reg_read(struct idt82 *idt, uint8_t reg);
/* board specific initializers */
int idt82_at91_init(struct idt82 *idt, void *spi, unsigned int id,
uint8_t cs, uint32_t spi_mr, uint32_t csr);
#endif

39
driver/idt82v2081_at91.c Normal file
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@ -0,0 +1,39 @@
#include <stdint.h>
#include <spi/spi.h>
#include "idt82v2081.h"
/* Adaption layer between idt82 driver and at91lib SPI driver */
#define B_READ (1 << 5)
/* backend function for core idt82 driver */
int idt82_reg_read(struct idt82 *idt, uint8_t reg)
{
uint16_t res;
SPI_Write(idt->priv, idt->cs, (reg & 0x1F) | B_READ);
while (!SPI_IsFinished(idt->priv));
res = SPI_Read(idt->priv, idt->cs);
return res >> 8;
}
/* backend function for core idt82 driver */
int idt82_reg_write(struct idt82 *idt, uint8_t reg, uint8_t val)
{
SPI_Write(idt->priv, idt->cs, (reg & 0x1F) | B_READ | (val << 8));
return 0;
}
/* initialize the SPI interface to the IDT82 */
int idt82_at91_init(struct idt82 *idt, void *spi, unsigned int id,
uint8_t cs, uint32_t spi_mr, uint32_t csr)
{
idt->priv = spi;
SPI_Configure(spi, id, spi_mr);
SPI_ConfigureNCPS(spi, cs, csr);
SPI_Enable(spi);
}