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Message-ID: <1342175967-10087-3-git-send-email-ldewangan@nvidia.com>
Date: Fri, 13 Jul 2012 16:09:24 +0530
From: Laxman Dewangan <ldewangan@...dia.com>
To: <grant.likely@...retlab.ca>, <linus.walleij@...ricsson.com>,
<sameo@...ux.intel.com>
CC: <linux-kernel@...r.kernel.org>, <swarren@...dia.com>,
<broonie@...nsource.wolfsonmicro.com>,
Laxman Dewangan <ldewangan@...dia.com>
Subject: [PATCH 2/5] mfd: Use regmap for tps6586x register access.
Using regmap apis for accessing the device registers.
Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
---
drivers/mfd/Kconfig | 1 +
drivers/mfd/tps6586x.c | 157 ++++++++++++++----------------------------------
2 files changed, 47 insertions(+), 111 deletions(-)
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fa267d4..ec885a9 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -200,6 +200,7 @@ config MFD_TPS6586X
bool "TPS6586x Power Management chips"
depends on I2C=y && GPIOLIB && GENERIC_HARDIRQS
select MFD_CORE
+ select REGMAP_I2C
depends on REGULATOR
help
If you say yes here you get support for the TPS6586X series of
diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
index 1256b7f..fb0c109 100644
--- a/drivers/mfd/tps6586x.c
+++ b/drivers/mfd/tps6586x.c
@@ -21,8 +21,10 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
+#include <linux/regmap.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/core.h>
@@ -48,6 +50,9 @@
/* device id */
#define TPS6586X_VERSIONCRC 0xcd
+/* Maximum register */
+#define TPS6586X_MAX_REGISTER (TPS6586X_VERSIONCRC + 1)
+
struct tps6586x_irq_data {
u8 mask_reg;
u8 mask_mask;
@@ -90,9 +95,9 @@ static const struct tps6586x_irq_data tps6586x_irqs[] = {
};
struct tps6586x {
- struct mutex lock;
struct device *dev;
struct i2c_client *client;
+ struct regmap *regmap;
struct gpio_chip gpio;
struct irq_chip irq_chip;
@@ -103,152 +108,69 @@ struct tps6586x {
u8 mask_reg[5];
};
-static inline int __tps6586x_read(struct i2c_client *client,
- int reg, uint8_t *val)
+static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
{
- int ret;
-
- ret = i2c_smbus_read_byte_data(client, reg);
- if (ret < 0) {
- dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
- return ret;
- }
-
- *val = (uint8_t)ret;
-
- return 0;
-}
-
-static inline int __tps6586x_reads(struct i2c_client *client, int reg,
- int len, uint8_t *val)
-{
- int ret;
-
- ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
- if (ret < 0) {
- dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
- return ret;
- }
-
- return 0;
-}
-
-static inline int __tps6586x_write(struct i2c_client *client,
- int reg, uint8_t val)
-{
- int ret;
-
- ret = i2c_smbus_write_byte_data(client, reg, val);
- if (ret < 0) {
- dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
- val, reg);
- return ret;
- }
-
- return 0;
-}
-
-static inline int __tps6586x_writes(struct i2c_client *client, int reg,
- int len, uint8_t *val)
-{
- int ret, i;
-
- for (i = 0; i < len; i++) {
- ret = __tps6586x_write(client, reg + i, *(val + i));
- if (ret < 0)
- return ret;
- }
-
- return 0;
+ return i2c_get_clientdata(to_i2c_client(dev));
}
int tps6586x_write(struct device *dev, int reg, uint8_t val)
{
- return __tps6586x_write(to_i2c_client(dev), reg, val);
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
+
+ return regmap_write(tps6586x->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_write);
int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
{
- return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
+
+ return regmap_bulk_write(tps6586x->regmap, reg, val, len);
}
EXPORT_SYMBOL_GPL(tps6586x_writes);
int tps6586x_read(struct device *dev, int reg, uint8_t *val)
{
- return __tps6586x_read(to_i2c_client(dev), reg, val);
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
+ unsigned int rval;
+ int ret;
+
+ ret = regmap_read(tps6586x->regmap, reg, &rval);
+ if (!ret)
+ *val = rval;
+ return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_read);
int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
{
- return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
+
+ return regmap_bulk_read(tps6586x->regmap, reg, val, len);
}
EXPORT_SYMBOL_GPL(tps6586x_reads);
int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
- struct tps6586x *tps6586x = dev_get_drvdata(dev);
- uint8_t reg_val;
- int ret = 0;
-
- mutex_lock(&tps6586x->lock);
-
- ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val);
- if (ret)
- goto out;
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
- if ((reg_val & bit_mask) != bit_mask) {
- reg_val |= bit_mask;
- ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
- }
-out:
- mutex_unlock(&tps6586x->lock);
- return ret;
+ return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
}
EXPORT_SYMBOL_GPL(tps6586x_set_bits);
int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
- struct tps6586x *tps6586x = dev_get_drvdata(dev);
- uint8_t reg_val;
- int ret = 0;
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
- mutex_lock(&tps6586x->lock);
-
- ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val);
- if (ret)
- goto out;
-
- if (reg_val & bit_mask) {
- reg_val &= ~bit_mask;
- ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
- }
-out:
- mutex_unlock(&tps6586x->lock);
- return ret;
+ return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
}
EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
{
- struct tps6586x *tps6586x = dev_get_drvdata(dev);
- uint8_t reg_val;
- int ret = 0;
-
- mutex_lock(&tps6586x->lock);
-
- ret = __tps6586x_read(tps6586x->client, reg, ®_val);
- if (ret)
- goto out;
+ struct tps6586x *tps6586x = dev_to_tps6586x(dev);
- if ((reg_val & mask) != val) {
- reg_val = (reg_val & ~mask) | val;
- ret = __tps6586x_write(tps6586x->client, reg, reg_val);
- }
-out:
- mutex_unlock(&tps6586x->lock);
- return ret;
+ return regmap_update_bits(tps6586x->regmap, reg, mask, val);
}
EXPORT_SYMBOL_GPL(tps6586x_update);
@@ -258,7 +180,7 @@ static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
uint8_t val;
int ret;
- ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
+ ret = tps6586x_read(tps6586x->dev, TPS6586X_GPIOSET2, &val);
if (ret)
return ret;
@@ -556,6 +478,12 @@ static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *clien
}
#endif
+static const struct regmap_config tps6586x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = TPS6586X_MAX_REGISTER - 1,
+};
+
static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -589,7 +517,14 @@ static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
tps6586x->dev = &client->dev;
i2c_set_clientdata(client, tps6586x);
- mutex_init(&tps6586x->lock);
+ tps6586x->regmap = devm_regmap_init_i2c(client,
+ &tps6586x_regmap_config);
+ if (IS_ERR(tps6586x->regmap)) {
+ ret = PTR_ERR(tps6586x->regmap);
+ dev_err(&client->dev, "regmap init failed: %d\n", ret);
+ return ret;
+ }
+
if (client->irq) {
ret = tps6586x_irq_init(tps6586x, client->irq,
--
1.7.1.1
--
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