In drivers/gpio/twl4030-gpio.c: For initialization of twl4030 check out: static int __init gpio_twl4030_init(void) On Wed, Nov 12, 2008 at 7:57 AM, Sudipta GHOSH <sudipta.ghosh@xxxxxxxxx> wrote: > Hi, > > I am having some problem with i2c. > > In my env I cant make i2c working. > > During boot, Twl4030 tries to send few i2c data, but it didnt going ok. > > static void twl_init_irq(void), issues many i2c write but fails with > error -121 (EREMOTEIO). > > I tries to some twl4030 i2c read and write from video driver but also > failes with same error. > > My env and my board is based on OMAP2. > > with some debugging I found dev->cmd_err is 2. > this is consistent (from http://np.comp.lancs.ac.uk:8080/svn/linuxnpgum/drivers/i2c/busses/i2c-omap.c): #define OMAP_I2C_STAT_NACK (1 << 1) /* No ack interrupt enable */ and since cmd_error IS 2 (==OMAP_I2C_STAT_NACK), the following is met: inside i2c-omap.c:omap_i2c_xfer_msg(): if (dev->cmd_err & OMAP_I2C_STAT_NACK) { if (msg->flags & I2C_M_IGNORE_NAK) return 0; if (stop) { w = omap_i2c_read_reg(dev, OMAP_I2C_CON_REG); w |= OMAP_I2C_CON_STP; omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w); } return -EREMOTEIO; } which gave rise to your EREMOTEIO error. > any idea? > > is there any special initialization needed for twl4030? > > -SG > this look similar to your problem: http://linux.omap.com/pipermail/davinci-linux-open-source/2007-January/002282.html -- Regards, Peter Teoh -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
