Hi madc users, I'm trying to use the twl4030-madc driver on my Overo-based OMAP3 board.
I'm using l-o 2.6.29 (git rev 58cf2f1425abfd3a449f9fe985e48be2d2555022) built using the OE 2.6.29 recipe. I've made the changes to board-overo.c as per this thread: http://www.nabble.com/ADC-timeout-on-Overo-td21222714.html#a21222714 and am using userspace test code like this: int d = open("/dev/twl4030-madc", O_RDWR | O_NONBLOCK); if (d == -1) { printf("could not open device\n"); return 1; } struct twl4030_madc_user_parms *par; par = malloc(sizeof(struct twl4030_madc_user_parms)); for (int i = 2; i < 8; i++) { printf("channel = %d ", i); memset(par, 0, sizeof(struct twl4030_madc_user_parms)); par->channel = i; int ret = ioctl(d, TWL4030_MADC_IOCX_ADC_RAW_READ, par); if (ret == 0 && par->status != -1) printf("result = 0x%04x\n\n", par->result); else { if (par->status == -1) printf("timeout! "); printf("ERROR\n"); } sleep(1); // avoid timing problems, just in case } It consistently hits this timeout in the madc driver (i.e. -EAGAIN is returned) even if I increase the timeout to, say, 1000 ms: static int twl4030_madc_wait_conversion_ready( struct twl4030_madc_data *madc, unsigned int timeout_ms, u8 status_reg) { unsigned long timeout; timeout = jiffies + msecs_to_jiffies(timeout_ms); do { u8 reg; reg = twl4030_madc_read(madc, status_reg); if (!(reg & TWL4030_MADC_BUSY) && (reg & TWL4030_MADC_EOC_SW)) return 0; } while (!time_after(jiffies, timeout)); return -EAGAIN; } It seems that the TWL4030_MADC_BUSY bit gets set and never cleared (as in the aforementioned nabble thread). Any ideas? Cheers, Hugo Vincent. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
