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Input: ad714x - use DMA-safe buffers for spi_write()

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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().

Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov
2011-08-22 09:45:39 -07:00
parent 6337de2204
commit c0409feb86
4 changed files with 129 additions and 101 deletions
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90
drivers/input/misc/ad714x.c
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@@ -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);