mfd: Make use of the ab8500 firmware read-modify-write service

This patch updates the AB8500 driver to make use of the I2C
read-modify-write service in the PRCMU firmware.

Signed-off-by: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
Reviewed-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index c637c8d..1f08704 100644 (file)
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -201,29 +201,38 @@ static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
        u8 reg, u8 bitmask, u8 bitvalues)
 {
        int ret;
-       u8 data;
        /* put the u8 bank and u8 reg together into a an u16.
         * bank on higher 8 bits and reg in lower */
        u16 addr = ((u16)bank) << 8 | reg;
 
        mutex_lock(&ab8500->lock);
 
-       ret = ab8500->read(ab8500, addr);
-       if (ret < 0) {
-               dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
-                       addr, ret);
-               goto out;
-       }
+       if (ab8500->write_masked == NULL) {
+               u8 data;
 
-       data = (u8)ret;
-       data = (~bitmask & data) | (bitmask & bitvalues);
+               ret = ab8500->read(ab8500, addr);
+               if (ret < 0) {
+                       dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
+                               addr, ret);
+                       goto out;
+               }
 
-       ret = ab8500->write(ab8500, addr, data);
-       if (ret < 0)
-               dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
-                       addr, ret);
+               data = (u8)ret;
+               data = (~bitmask & data) | (bitmask & bitvalues);
+
+               ret = ab8500->write(ab8500, addr, data);
+               if (ret < 0)
+                       dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
+                               addr, ret);
 
-       dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
+               dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr,
+                       data);
+               goto out;
+       }
+       ret = ab8500->write_masked(ab8500, addr, bitmask, bitvalues);
+       if (ret < 0)
+               dev_err(ab8500->dev, "failed to modify reg %#x: %d\n", addr,
+                       ret);
 out:
        mutex_unlock(&ab8500->lock);
        return ret;

diff --git a/drivers/mfd/ab8500-i2c.c b/drivers/mfd/ab8500-i2c.c
index 70a16ae..b83045f 100644 (file)
--- a/drivers/mfd/ab8500-i2c.c
+++ b/drivers/mfd/ab8500-i2c.c
@@ -11,7 +11,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/abx500/ab8500.h>
-#include <linux/mfd/db8500-prcmu.h>
+#include <linux/mfd/dbx500-prcmu.h>
 
 static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
 {
@@ -23,6 +23,18 @@ static int ab8500_i2c_write(struct ab8500 *ab8500, u16 addr, u8 data)
        return ret;
 }
 
+static int ab8500_i2c_write_masked(struct ab8500 *ab8500, u16 addr, u8 mask,
+       u8 data)
+{
+       int ret;
+
+       ret = prcmu_abb_write_masked((u8)(addr >> 8), (u8)(addr & 0xFF), &data,
+               &mask, 1);
+       if (ret < 0)
+               dev_err(ab8500->dev, "prcmu i2c error %d\n", ret);
+       return ret;
+}
+
 static int ab8500_i2c_read(struct ab8500 *ab8500, u16 addr)
 {
        int ret;
@@ -59,6 +71,7 @@ static int __devinit ab8500_i2c_probe(struct platform_device *plf)
 
        ab8500->read = ab8500_i2c_read;
        ab8500->write = ab8500_i2c_write;
+       ab8500->write_masked = ab8500_i2c_write_masked;
 
        platform_set_drvdata(plf, ab8500);
 

diff --git a/include/linux/mfd/abx500/ab8500.h b/include/linux/mfd/abx500/ab8500.h
index 78ed95b..3b551a1 100644 (file)
--- a/include/linux/mfd/abx500/ab8500.h
+++ b/include/linux/mfd/abx500/ab8500.h
@@ -217,6 +217,7 @@ enum ab8500_version {
  * @version: chip version id (e.g. ab8500 or ab9540)
  * @chip_id: chip revision id
  * @write: register write
+ * @write_masked: masked register write
  * @read: register read
  * @rx_buf: rx buf for SPI
  * @tx_buf: tx buf for SPI
@@ -236,8 +237,9 @@ struct ab8500 {
        enum ab8500_version version;
        u8              chip_id;
 
-       int (*write) (struct ab8500 *a8500, u16 addr, u8 data);
-       int (*read) (struct ab8500 *a8500, u16 addr);
+       int (*write)(struct ab8500 *ab8500, u16 addr, u8 data);
+       int (*write_masked)(struct ab8500 *ab8500, u16 addr, u8 mask, u8 data);
+       int (*read)(struct ab8500 *ab8500, u16 addr);
 
        unsigned long   tx_buf[4];
        unsigned long   rx_buf[4];