i2c: Merge omap i2c drivers from omap-historic

[linux-2.6-omap-h63xx.git] / drivers / i2c / busses / i2c-omap.c

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index e471e3bfdc1e08872dcc9d4dd23e1e81a5d422cd..81e481ad85e1780ef9f96f686d6ecf7aac6cb3c2 100644 (file)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -36,6 +36,10 @@
 
 #include <asm/io.h>
 
+/* Hack to enable zero length transfers and smbus quick until clean fix
+   is available */
+#define OMAP_HACK
+
 /* timeout waiting for the controller to respond */
 #define OMAP_I2C_TIMEOUT (msecs_to_jiffies(1000))
 
@@ -285,12 +289,16 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
                             struct i2c_msg *msg, int stop)
 {
        struct omap_i2c_dev *dev = i2c_get_adapdata(adap);
+#ifdef OMAP_HACK
+       u8 zero_byte = 0;
+#endif
        int r;
        u16 w;
 
        dev_dbg(dev->dev, "addr: 0x%04x, len: %d, flags: 0x%x, stop: %d\n",
                msg->addr, msg->len, msg->flags, stop);
 
+#ifndef OMAP_HACK
        if (msg->len == 0)
                return -EINVAL;
 
@@ -300,6 +308,27 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
        dev->buf = msg->buf;
        dev->buf_len = msg->len;
 
+#else
+
+       omap_i2c_write_reg(dev, OMAP_I2C_SA_REG, msg->addr);
+       /* REVISIT: Remove this hack when we can get I2C chips from board-*.c
+        *          files
+        * Sigh, seems we can't do zero length transactions. Thus, we
+        * can't probe for devices w/o actually sending/receiving at least
+        * a single byte. So we'll set count to 1 for the zero length
+        * transaction case and hope we don't cause grief for some
+        * arbitrary device due to random byte write/read during
+        * probes.
+        */
+       if (msg->len == 0) {
+               dev->buf = &zero_byte;
+               dev->buf_len = 1;
+       } else {
+               dev->buf = msg->buf;
+               dev->buf_len = msg->len;
+       }
+#endif
+
        omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
 
        init_completion(&dev->cmd_complete);
@@ -314,8 +343,8 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
                w |= OMAP_I2C_CON_STP;
        omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
 
-       r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
-                                                     OMAP_I2C_TIMEOUT);
+       r = wait_for_completion_timeout(&dev->cmd_complete,
+                                       OMAP_I2C_TIMEOUT);
        dev->buf_len = 0;
        if (r < 0)
                return r;
@@ -383,7 +412,11 @@ out:
 static u32
 omap_i2c_func(struct i2c_adapter *adap)
 {
+#ifndef OMAP_HACK
        return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
+#else
+       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+#endif
 }
 
 static inline void
@@ -478,9 +511,14 @@ omap_i2c_isr(int this_irq, void *dev_id)
                        if (dev->buf_len) {
                                *dev->buf++ = w;
                                dev->buf_len--;
-                               if (dev->buf_len) {
-                                       *dev->buf++ = w >> 8;
-                                       dev->buf_len--;
+                               /*
+                                * Data reg in 2430 is 8 bit wide,
+                                */
+                               if (!cpu_is_omap2430()) {
+                                       if (dev->buf_len) {
+                                               *dev->buf++ = w >> 8;
+                                               dev->buf_len--;
+                                       }
                                }
                        } else
                                dev_err(dev->dev, "RRDY IRQ while no data"
@@ -493,9 +531,14 @@ omap_i2c_isr(int this_irq, void *dev_id)
                        if (dev->buf_len) {
                                w = *dev->buf++;
                                dev->buf_len--;
-                               if (dev->buf_len) {
-                                       w |= *dev->buf++ << 8;
-                                       dev->buf_len--;
+                               /*
+                                * Data reg in 2430 is 8 bit wide,
+                                */
+                               if (!cpu_is_omap2430()) {
+                                       if (dev->buf_len) {
+                                               w |= *dev->buf++ << 8;
+                                               dev->buf_len--;
+                                       }
                                }
                        } else
                                dev_err(dev->dev, "XRDY IRQ while no"