mfd: Use regmap for tps65910 register access.
Laxman Dewangan [Tue, 21 Feb 2012 12:51:34 +0000 (17:51 +0530)]
Using regmap apis for accessing the device registers and
using RBTREE caching mechanims for caching registers.

Enabling caching of the registers which is used for voltage
controls. By doing this, the modify_bits operation is faster as
it does not involve the i2c register read from device, just read
from cache. This results faster set voltage operation.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
cherry picked from mainline commit
0e7018c7b161dc5544f7af862dc59e0b9a0dbd20

Change-Id: Ie0bc1fd32f1c7f7b80004b30ec9ba615d4c29360
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/86349

drivers/mfd/Kconfig
drivers/mfd/tps65910.c
include/linux/mfd/tps65910.h

index 2cf0a06..993b32b 100644 (file)
@@ -176,6 +176,7 @@ config MFD_TPS65910
        depends on I2C=y && GPIOLIB
        select MFD_CORE
        select GPIO_TPS65910
+       select REGMAP_I2C
        help
          if you say yes here you get support for the TPS65910 series of
          Power Management chips.
index 4392f6b..1c4f53e 100644 (file)
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
+#include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
 #include <linux/mfd/core.h>
+#include <linux/regmap.h>
 #include <linux/mfd/tps65910.h>
 
 static struct mfd_cell tps65910s[] = {
@@ -38,99 +40,56 @@ static struct mfd_cell tps65910s[] = {
 static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
                                  int bytes, void *dest)
 {
-       struct i2c_client *i2c = tps65910->i2c_client;
-       struct i2c_msg xfer[2];
-       int ret;
-
-       /* Write register */
-       xfer[0].addr = i2c->addr;
-       xfer[0].flags = 0;
-       xfer[0].len = 1;
-       xfer[0].buf = &reg;
-
-       /* Read data */
-       xfer[1].addr = i2c->addr;
-       xfer[1].flags = I2C_M_RD;
-       xfer[1].len = bytes;
-       xfer[1].buf = dest;
-
-       ret = i2c_transfer(i2c->adapter, xfer, 2);
-       if (ret == 2)
-               ret = 0;
-       else if (ret >= 0)
-               ret = -EIO;
-
-       return ret;
+       return regmap_bulk_read(tps65910->regmap, reg, dest, bytes);
 }
 
 static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
-                                  int bytes, void *src)
+                                 int bytes, void *src)
 {
-       struct i2c_client *i2c = tps65910->i2c_client;
-       /* we add 1 byte for device register */
-       u8 msg[TPS65910_MAX_REGISTER + 1];
-       int ret;
-
-       if (bytes > TPS65910_MAX_REGISTER)
-               return -EINVAL;
-
-       msg[0] = reg;
-       memcpy(&msg[1], src, bytes);
-
-       ret = i2c_master_send(i2c, msg, bytes + 1);
-       if (ret < 0)
-               return ret;
-       if (ret != bytes + 1)
-               return -EIO;
-       return 0;
+       return regmap_bulk_write(tps65910->regmap, reg, src, bytes);
 }
 
 int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
 {
-       u8 data;
-       int err;
-
-       mutex_lock(&tps65910->io_mutex);
-       err = tps65910_i2c_read(tps65910, reg, 1, &data);
-       if (err) {
-               dev_err(tps65910->dev, "read from reg %x failed\n", reg);
-               goto out;
-       }
-
-       data |= mask;
-       err = tps65910_i2c_write(tps65910, reg, 1, &data);
-       if (err)
-               dev_err(tps65910->dev, "write to reg %x failed\n", reg);
-
-out:
-       mutex_unlock(&tps65910->io_mutex);
-       return err;
+       return regmap_update_bits(tps65910->regmap, reg, mask, mask);
 }
 EXPORT_SYMBOL_GPL(tps65910_set_bits);
 
 int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
 {
-       u8 data;
-       int err;
-
-       mutex_lock(&tps65910->io_mutex);
-       err = tps65910_i2c_read(tps65910, reg, 1, &data);
-       if (err) {
-               dev_err(tps65910->dev, "read from reg %x failed\n", reg);
-               goto out;
-       }
-
-       data &= ~mask;
-       err = tps65910_i2c_write(tps65910, reg, 1, &data);
-       if (err)
-               dev_err(tps65910->dev, "write to reg %x failed\n", reg);
-
-out:
-       mutex_unlock(&tps65910->io_mutex);
-       return err;
+       return regmap_update_bits(tps65910->regmap, reg, mask, 0);
 }
 EXPORT_SYMBOL_GPL(tps65910_clear_bits);
 
+static bool is_volatile_reg(struct device *dev, unsigned int reg)
+{
+       struct tps65910 *tps65910 = dev_get_drvdata(dev);
+
+       /*
+        * Caching all regulator registers.
+        * All regualator register address range is same for
+        * TPS65910 and TPS65911
+        */
+       if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
+               /* Check for non-existing register */
+               if (tps65910_chip_id(tps65910) == TPS65910)
+                       if ((reg == TPS65911_VDDCTRL_OP) ||
+                               (reg == TPS65911_VDDCTRL_SR))
+                               return true;
+               return false;
+       }
+       return true;
+}
+
+static const struct regmap_config rc5t583_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .volatile_reg = is_volatile_reg,
+       .max_register = TPS65910_MAX_REGISTER,
+       .num_reg_defaults_raw = TPS65910_MAX_REGISTER,
+       .cache_type = REGCACHE_RBTREE,
+};
+
 static int tps65910_i2c_probe(struct i2c_client *i2c,
                            const struct i2c_device_id *id)
 {
@@ -161,6 +120,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
        tps65910->write = tps65910_i2c_write;
        mutex_init(&tps65910->io_mutex);
 
+       tps65910->regmap = regmap_init_i2c(i2c, &rc5t583_regmap_config);
+       if (IS_ERR(tps65910->regmap)) {
+               ret = PTR_ERR(tps65910->regmap);
+               dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
+               goto regmap_err;
+       }
+
        ret = mfd_add_devices(tps65910->dev, -1,
                              tps65910s, ARRAY_SIZE(tps65910s),
                              NULL, 0);
@@ -178,6 +144,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
        return ret;
 
 err:
+       regmap_exit(tps65910->regmap);
+regmap_err:
        kfree(tps65910);
        kfree(init_data);
        return ret;
@@ -189,6 +157,7 @@ static int tps65910_i2c_remove(struct i2c_client *i2c)
 
        tps65910_irq_exit(tps65910);
        mfd_remove_devices(tps65910->dev);
+       regmap_exit(tps65910->regmap);
        kfree(tps65910);
 
        return 0;
index 520f1bf..06a4cd6 100644 (file)
@@ -805,6 +805,7 @@ struct tps65910_board {
 struct tps65910 {
        struct device *dev;
        struct i2c_client *i2c_client;
+       struct regmap *regmap;
        struct mutex io_mutex;
        unsigned int id;
        int (*read)(struct tps65910 *tps65910, u8 reg, int size, void *dest);