spi_write() requires use of DMA-safe (cacheline aligned) buffers.
Also use the same buffers when reading data since to avoid extra
locking and potential memory allocation in spi_write_then_read().
Signed-off-by: Dmitry Torokhov <dtor@xxxxxxx>
---
drivers/input/misc/ad714x-i2c.c | 60 ++++++++++++++------------
drivers/input/misc/ad714x-spi.c | 51 ++++++++++++++++------
drivers/input/misc/ad714x.c | 90 +++++++++++++--------------------------
drivers/input/misc/ad714x.h | 33 +++++++++++++-
4 files changed, 131 insertions(+), 103 deletions(-)
diff --git a/drivers/input/misc/ad714x-i2c.c b/drivers/input/misc/ad714x-i2c.c
index 00a6a22..6c61218 100644
--- a/drivers/input/misc/ad714x-i2c.c
+++ b/drivers/input/misc/ad714x-i2c.c
@@ -27,40 +27,46 @@ static int ad714x_i2c_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
-static int ad714x_i2c_write(struct device *dev, unsigned short reg,
- unsigned short data)
+static int ad714x_i2c_write(struct ad714x_chip *chip,
+ unsigned short reg, unsigned short data)
{
- struct i2c_client *client = to_i2c_client(dev);
- int ret = 0;
- unsigned short tx[2] = {
- cpu_to_be16(reg),
- cpu_to_be16(data)
- };
-
- ret = i2c_master_send(client, (u8 *)tx, 4);
- if (ret < 0)
- dev_err(&client->dev, "I2C write error\n");
-
- return ret;
+ struct i2c_client *client = to_i2c_client(chip->dev);
+ int error;
+
+ chip->xfer_buf[0] = cpu_to_be16(reg);
+ chip->xfer_buf[1] = cpu_to_be16(data);
+
+ error = i2c_master_send(client, (u8 *)chip->xfer_buf,
+ 2 * sizeof(*chip->xfer_buf));
+ if (unlikely(error < 0)) {
+ dev_err(&client->dev, "I2C write error: %d\n", error);
+ return error;
+ }
+
+ return 0;
}
-static int ad714x_i2c_read(struct device *dev, unsigned short reg,
- unsigned short *data)
+static int ad714x_i2c_read(struct ad714x_chip *chip,
+ unsigned short reg, unsigned short *data)
{
- struct i2c_client *client = to_i2c_client(dev);
- int ret = 0;
- unsigned short tx = cpu_to_be16(reg);
+ struct i2c_client *client = to_i2c_client(chip->dev);
+ int error;
+
+ chip->xfer_buf[0] = cpu_to_be16(reg);
- ret = i2c_master_send(client, (u8 *)&tx, 2);
- if (ret >= 0)
- ret = i2c_master_recv(client, (u8 *)data, 2);
+ error = i2c_master_send(client, (u8 *)chip->xfer_buf,
+ sizeof(*chip->xfer_buf));
+ if (error >= 0)
+ error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
+ sizeof(*chip->xfer_buf));
- if (unlikely(ret < 0))
- dev_err(&client->dev, "I2C read error\n");
- else
- *data = be16_to_cpu(*data);
+ if (unlikely(error < 0)) {
+ dev_err(&client->dev, "I2C read error: %d\n", error);
+ return error;
+ }
- return ret;
+ *data = be16_to_cpup(chip->xfer_buf);
+ return 0;
}
static int __devinit ad714x_i2c_probe(struct i2c_client *client,
diff --git a/drivers/input/misc/ad714x-spi.c b/drivers/input/misc/ad714x-spi.c
index 0c7f948..306577d 100644
--- a/drivers/input/misc/ad714x-spi.c
+++ b/drivers/input/misc/ad714x-spi.c
@@ -30,31 +30,54 @@ static int ad714x_spi_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
-static int ad714x_spi_read(struct device *dev,
+static int ad714x_spi_read(struct ad714x_chip *chip,
unsigned short reg, unsigned short *data)
{
- struct spi_device *spi = to_spi_device(dev);
- unsigned short tx = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
+ struct spi_device *spi = to_spi_device(chip->dev);
+ struct spi_message message;
+ struct spi_transfer xfer[2];
+ int error;
+
+ spi_message_init(&message);
+ memset(xfer, 0, sizeof(xfer));
+
+ chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
AD714x_SPI_READ | reg);
- int ret;
+ xfer[0].tx_buf = &chip->xfer_buf[0];
+ xfer[0].len = sizeof(chip->xfer_buf[0]);
+ spi_message_add_tail(&xfer[0], &message);
- ret = spi_write_then_read(spi, &tx, 2, data, 2);
+ xfer[1].rx_buf = &chip->xfer_buf[1];
+ xfer[1].len = sizeof(chip->xfer_buf[1]);
+ spi_message_add_tail(&xfer[1], &message);
- *data = be16_to_cpup(data);
+ error = spi_sync(spi, &message);
+ if (unlikely(error)) {
+ dev_err(chip->dev, "SPI read error: %d\n", error);
+ return error;
+ }
- return ret;
+ *data = be16_to_cpu(chip->xfer_buf[1]);
+ return 0;
}
-static int ad714x_spi_write(struct device *dev,
+static int ad714x_spi_write(struct ad714x_chip *chip,
unsigned short reg, unsigned short data)
{
- struct spi_device *spi = to_spi_device(dev);
- unsigned short tx[2] = {
- cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg),
- cpu_to_be16(data)
- };
+ struct spi_device *spi = to_spi_device(chip->dev);
+ int error;
- return spi_write(spi, (u8 *)tx, 4);
+ chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
+ chip->xfer_buf[1] = cpu_to_be16(data);
+
+ error = spi_write(spi, (u8 *)chip->xfer_buf,
+ 2 * sizeof(*chip->xfer_buf));
+ if (unlikely(error)) {
+ dev_err(chip->dev, "SPI write error: %d\n", error);
+ return error;
+ }
+
+ return 0;
}
static int __devinit ad714x_spi_probe(struct spi_device *spi)
diff --git a/drivers/input/misc/ad714x.c b/drivers/input/misc/ad714x.c
index c3a62c4..2be0366 100644
--- a/drivers/input/misc/ad714x.c
+++ b/drivers/input/misc/ad714x.c
@@ -59,7 +59,6 @@
#define STAGE11_AMBIENT 0x27D
#define PER_STAGE_REG_NUM 36
-#define STAGE_NUM 12
#define STAGE_CFGREG_NUM 8
#define SYS_CFGREG_NUM 8
@@ -124,28 +123,6 @@ struct ad714x_driver_data {
* information to integrate all things which will be private data
* of spi/i2c device
*/
-struct ad714x_chip {
- unsigned short h_state;
- unsigned short l_state;
- unsigned short c_state;
- unsigned short adc_reg[STAGE_NUM];
- unsigned short amb_reg[STAGE_NUM];
- unsigned short sensor_val[STAGE_NUM];
-
- struct ad714x_platform_data *hw;
- struct ad714x_driver_data *sw;
-
- int irq;
- struct device *dev;
- ad714x_read_t read;
- ad714x_write_t write;
-
- struct mutex mutex;
-
- unsigned product;
- unsigned version;
-};
-
static void ad714x_use_com_int(struct ad714x_chip *ad714x,
int start_stage, int end_stage)
{
@@ -154,13 +131,13 @@ static void ad714x_use_com_int(struct ad714x_chip *ad714x,
mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
- ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data);
+ ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
data |= 1 << end_stage;
- ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data);
+ ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
- ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data);
+ ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
data &= ~mask;
- ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data);
+ ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
}
static void ad714x_use_thr_int(struct ad714x_chip *ad714x,
@@ -171,13 +148,13 @@ static void ad714x_use_thr_int(struct ad714x_chip *ad714x,
mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
- ad714x->read(ad714x->dev, STG_COM_INT_EN_REG, &data);
+ ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
data &= ~(1 << end_stage);
- ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data);
+ ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
- ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data);
+ ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
data |= mask;
- ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data);
+ ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
}
static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x,
@@ -274,10 +251,8 @@ static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
int i;
for (i = hw->start_stage; i <= hw->end_stage; i++) {
- ad714x->read(ad714x->dev, CDC_RESULT_S0 + i,
- &ad714x->adc_reg[i]);
- ad714x->read(ad714x->dev,
- STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
+ ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
+ ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
&ad714x->amb_reg[i]);
ad714x->sensor_val[i] = abs(ad714x->adc_reg[i] -
@@ -445,10 +420,8 @@ static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
int i;
for (i = hw->start_stage; i <= hw->end_stage; i++) {
- ad714x->read(ad714x->dev, CDC_RESULT_S0 + i,
- &ad714x->adc_reg[i]);
- ad714x->read(ad714x->dev,
- STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
+ ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
+ ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
&ad714x->amb_reg[i]);
if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
ad714x->sensor_val[i] = ad714x->adc_reg[i] -
@@ -598,10 +571,8 @@ static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
int i;
for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) {
- ad714x->read(ad714x->dev, CDC_RESULT_S0 + i,
- &ad714x->adc_reg[i]);
- ad714x->read(ad714x->dev,
- STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
+ ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
+ ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
&ad714x->amb_reg[i]);
if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
ad714x->sensor_val[i] = ad714x->adc_reg[i] -
@@ -891,7 +862,7 @@ static int ad714x_hw_detect(struct ad714x_chip *ad714x)
{
unsigned short data;
- ad714x->read(ad714x->dev, AD714X_PARTID_REG, &data);
+ ad714x->read(ad714x, AD714X_PARTID_REG, &data);
switch (data & 0xFFF0) {
case AD7142_PARTID:
ad714x->product = 0x7142;
@@ -940,23 +911,22 @@ static void ad714x_hw_init(struct ad714x_chip *ad714x)
for (i = 0; i < STAGE_NUM; i++) {
reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM;
for (j = 0; j < STAGE_CFGREG_NUM; j++)
- ad714x->write(ad714x->dev, reg_base + j,
+ ad714x->write(ad714x, reg_base + j,
ad714x->hw->stage_cfg_reg[i][j]);
}
for (i = 0; i < SYS_CFGREG_NUM; i++)
- ad714x->write(ad714x->dev, AD714X_SYSCFG_REG + i,
+ ad714x->write(ad714x, AD714X_SYSCFG_REG + i,
ad714x->hw->sys_cfg_reg[i]);
for (i = 0; i < SYS_CFGREG_NUM; i++)
- ad714x->read(ad714x->dev, AD714X_SYSCFG_REG + i,
- &data);
+ ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data);
- ad714x->write(ad714x->dev, AD714X_STG_CAL_EN_REG, 0xFFF);
+ ad714x->write(ad714x, AD714X_STG_CAL_EN_REG, 0xFFF);
/* clear all interrupts */
- ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data);
- ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data);
- ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_LOW_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_COM_INT_STA_REG, &data);
}
static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
@@ -966,9 +936,9 @@ static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
mutex_lock(&ad714x->mutex);
- ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &ad714x->l_state);
- ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &ad714x->h_state);
- ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &ad714x->c_state);
+ ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state);
+ ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &ad714x->h_state);
+ ad714x->read(ad714x, STG_COM_INT_STA_REG, &ad714x->c_state);
for (i = 0; i < ad714x->hw->button_num; i++)
ad714x_button_state_machine(ad714x, i);
@@ -1245,7 +1215,7 @@ int ad714x_disable(struct ad714x_chip *ad714x)
mutex_lock(&ad714x->mutex);
data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3;
- ad714x->write(ad714x->dev, AD714X_PWR_CTRL, data);
+ ad714x->write(ad714x, AD714X_PWR_CTRL, data);
mutex_unlock(&ad714x->mutex);
@@ -1263,16 +1233,16 @@ int ad714x_enable(struct ad714x_chip *ad714x)
/* resume to non-shutdown mode */
- ad714x->write(ad714x->dev, AD714X_PWR_CTRL,
+ ad714x->write(ad714x, AD714X_PWR_CTRL,
ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]);
/* make sure the interrupt output line is not low level after resume,
* otherwise we will get no chance to enter falling-edge irq again
*/
- ad714x->read(ad714x->dev, STG_LOW_INT_STA_REG, &data);
- ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data);
- ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_LOW_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &data);
+ ad714x->read(ad714x, STG_COM_INT_STA_REG, &data);
mutex_unlock(&ad714x->mutex);
diff --git a/drivers/input/misc/ad714x.h b/drivers/input/misc/ad714x.h
index 45c54fb..d12d149 100644
--- a/drivers/input/misc/ad714x.h
+++ b/drivers/input/misc/ad714x.h
@@ -11,11 +11,40 @@
#include <linux/types.h>
+#define STAGE_NUM 12
+
struct device;
+struct ad714x_platform_data;
+struct ad714x_driver_data;
struct ad714x_chip;
-typedef int (*ad714x_read_t)(struct device *, unsigned short, unsigned short *);
-typedef int (*ad714x_write_t)(struct device *, unsigned short, unsigned short);
+typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *);
+typedef int (*ad714x_write_t)(struct ad714x_chip *, unsigned short, unsigned short);
+
+struct ad714x_chip {
+ unsigned short h_state;
+ unsigned short l_state;
+ unsigned short c_state;
+ unsigned short adc_reg[STAGE_NUM];
+ unsigned short amb_reg[STAGE_NUM];
+ unsigned short sensor_val[STAGE_NUM];
+
+ struct ad714x_platform_data *hw;
+ struct ad714x_driver_data *sw;
+
+ int irq;
+ struct device *dev;
+ ad714x_read_t read;
+ ad714x_write_t write;
+
+ struct mutex mutex;
+
+ unsigned product;
+ unsigned version;
+
+ __be16 xfer_buf[16] ____cacheline_aligned;
+
+};
int ad714x_disable(struct ad714x_chip *ad714x);
int ad714x_enable(struct ad714x_chip *ad714x);
--
1.7.6
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
