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Subject[PATCH 2/8] Input: mms114 - get read of custm i2c read/write functions
Date
The 'mms114_read_reg' and 'mms114_write_reg' are used when
reading or writing to the 'MMS114_MODE_CONTROL' register for
updating the 'cache_mode_control' variable.

Update the 'cache_mode_control' variable in the calling
mms114_set_active() function and get rid of all the custom i2c
read/write functions.

With this remove also the redundant sleep of MMS114_I2C_DELAY
(50us) between i2c operations. The waiting should to be handled
by the i2c driver.

Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
---
drivers/input/touchscreen/mms114.c | 87 +++++---------------------------------
1 file changed, 10 insertions(+), 77 deletions(-)

diff --git a/drivers/input/touchscreen/mms114.c b/drivers/input/touchscreen/mms114.c
index 0b8b1f0e8ba6..94a97049d711 100644
--- a/drivers/input/touchscreen/mms114.c
+++ b/drivers/input/touchscreen/mms114.c
@@ -37,9 +37,6 @@
#define MMS152_FW_REV 0xE1
#define MMS152_COMPAT_GROUP 0xF2

-/* Minimum delay time is 50us between stop and start signal of i2c */
-#define MMS114_I2C_DELAY 50
-
/* 200ms needs after power on */
#define MMS114_POWERON_DELAY 200

@@ -83,76 +80,6 @@ struct mms114_touch {
u8 reserved[2];
} __packed;

-static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
- unsigned int len, u8 *val)
-{
- struct i2c_client *client = data->client;
- struct i2c_msg xfer[2];
- u8 buf = reg & 0xff;
- int error;
-
- if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
- BUG();
-
- /* Write register: use repeated start */
- xfer[0].addr = client->addr;
- xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART;
- xfer[0].len = 1;
- xfer[0].buf = &buf;
-
- /* Read data */
- xfer[1].addr = client->addr;
- xfer[1].flags = I2C_M_RD;
- xfer[1].len = len;
- xfer[1].buf = val;
-
- error = i2c_transfer(client->adapter, xfer, 2);
- if (error != 2) {
- dev_err(&client->dev,
- "%s: i2c transfer failed (%d)\n", __func__, error);
- return error < 0 ? error : -EIO;
- }
- udelay(MMS114_I2C_DELAY);
-
- return 0;
-}
-
-static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
-{
- u8 val;
- int error;
-
- if (reg == MMS114_MODE_CONTROL)
- return data->cache_mode_control;
-
- error = __mms114_read_reg(data, reg, 1, &val);
- return error < 0 ? error : val;
-}
-
-static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
- unsigned int val)
-{
- struct i2c_client *client = data->client;
- u8 buf[2];
- int error;
-
- buf[0] = reg & 0xff;
- buf[1] = val & 0xff;
-
- error = i2c_master_send(client, buf, 2);
- if (error != 2) {
- dev_err(&client->dev,
- "%s: i2c send failed (%d)\n", __func__, error);
- return error < 0 ? error : -EIO;
- }
- udelay(MMS114_I2C_DELAY);
-
- if (reg == MMS114_MODE_CONTROL)
- data->cache_mode_control = val;
-
- return 0;
-}
-
static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
{
struct i2c_client *client = data->client;
@@ -231,19 +158,25 @@ static irqreturn_t mms114_interrupt(int irq, void *dev_id)

static int mms114_set_active(struct mms114_data *data, bool active)
{
- int val;
+ int val, err;

- val = mms114_read_reg(data, MMS114_MODE_CONTROL);
+ val = i2c_smbus_read_byte_data(data->client, MMS114_MODE_CONTROL);
if (val < 0)
return val;

- val &= ~MMS114_OPERATION_MODE_MASK;
+ val = data->cache_mode_control &= ~MMS114_OPERATION_MODE_MASK;

/* If active is false, sleep mode */
if (active)
val |= MMS114_ACTIVE;

- return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
+ err = i2c_smbus_write_byte_data(data->client, MMS114_MODE_CONTROL, val);
+ if (err < 0)
+ return err;
+
+ data->cache_mode_control = val;
+
+ return 0;
}

static int mms114_get_version(struct mms114_data *data)
--
2.15.1
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