summaryrefslogtreecommitdiff
path: root/drivers/ds1722.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/ds1722.c')
-rw-r--r--drivers/ds1722.c142
1 files changed, 0 insertions, 142 deletions
diff --git a/drivers/ds1722.c b/drivers/ds1722.c
deleted file mode 100644
index c19ee01..0000000
--- a/drivers/ds1722.c
+++ /dev/null
@@ -1,142 +0,0 @@
-
-#include <common.h>
-
-#ifdef CONFIG_DS1722
-
-#include <ssi.h>
-
-static void ds1722_select(int dev)
-{
- ssi_set_interface(4096, 0, 0, 0);
- ssi_chip_select(0);
- udelay(1);
- ssi_chip_select(dev);
- udelay(1);
-}
-
-
-u8 ds1722_read(int dev, int addr)
-{
- u8 res;
-
- ds1722_select(dev);
-
- ssi_tx_byte(addr);
- res = ssi_rx_byte();
-
- ssi_chip_select(0);
-
- return res;
-}
-
-void ds1722_write(int dev, int addr, u8 data)
-{
- ds1722_select(dev);
-
- ssi_tx_byte(0x80|addr);
- ssi_tx_byte(data);
-
- ssi_chip_select(0);
-}
-
-
-u16 ds1722_temp(int dev, int resolution)
-{
- static int useconds[] = {
- 75000, 150000, 300000, 600000, 1200000
- };
- char temp;
- u16 res;
-
-
- /* set up the desired resulotion ... */
- ds1722_write(dev, 0, 0xe0 | (resolution << 1));
-
- /* wait while the chip measures the tremperature */
- udelay(useconds[resolution]);
-
- res = (temp = ds1722_read(dev, 2)) << 8;
-
- if (temp < 0) {
- temp = (16 - (ds1722_read(dev, 1) >> 4)) & 0x0f;
- } else {
- temp = (ds1722_read(dev, 1) >> 4);
- }
-
- switch (temp) {
- case 0:
- /* .0000 */
- break;
- case 1:
- /* .0625 */
- res |=1;
- break;
- case 2:
- /* .1250 */
- res |=1;
- break;
- case 3:
- /* .1875 */
- res |=2;
- break;
- case 4:
- /* .2500 */
- res |=3;
- break;
- case 5:
- /* .3125 */
- res |=3;
- break;
- case 6:
- /* .3750 */
- res |=4;
- break;
- case 7:
- /* .4375 */
- res |=4;
- break;
- case 8:
- /* .5000 */
- res |=5;
- break;
- case 9:
- /* .5625 */
- res |=6;
- break;
- case 10:
- /* .6250 */
- res |=6;
- break;
- case 11:
- /* .6875 */
- res |=7;
- break;
- case 12:
- /* .7500 */
- res |=8;
- break;
- case 13:
- /* .8125 */
- res |=8;
- break;
- case 14:
- /* .8750 */
- res |=9;
- break;
- case 15:
- /* .9375 */
- res |=9;
- break;
- }
- return res;
-
-}
-
-int ds1722_probe(int dev)
-{
- u16 temp = ds1722_temp(dev, DS1722_RESOLUTION_12BIT);
- printf("%d.%d deg C\n\n", (char)(temp >> 8), temp & 0xff);
- return 0;
-}
-
-#endif