Input: ad714x - read the interrupt status registers in a row
The interrupt status registers should be read in row to avoid invalid data. Alter "read" method for both bus options to allow reading several registers in a row and make sure we read interrupt status registers properly. Read sequence saves 50% of bus transactions compared to single register reads. So use it also for the result registers, which are also located in a row. Also update copyright notice. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Michael Hennerich
Dmitry Torokhov
parent
c0409feb86
commit
9eff794b77
4 changed files with 51 additions and 43 deletions
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@ -1,7 +1,7 @@
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/*
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* AD714X CapTouch Programmable Controller driver (I2C bus)
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*
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* Copyright 2009 Analog Devices Inc.
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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@ -47,9 +47,10 @@ static int ad714x_i2c_write(struct ad714x_chip *chip,
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}
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static int ad714x_i2c_read(struct ad714x_chip *chip,
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unsigned short reg, unsigned short *data)
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unsigned short reg, unsigned short *data, size_t len)
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{
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struct i2c_client *client = to_i2c_client(chip->dev);
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int i;
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int error;
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chip->xfer_buf[0] = cpu_to_be16(reg);
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@ -58,14 +59,16 @@ static int ad714x_i2c_read(struct ad714x_chip *chip,
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sizeof(*chip->xfer_buf));
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if (error >= 0)
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error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
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sizeof(*chip->xfer_buf));
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len * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C read error: %d\n", error);
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return error;
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}
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*data = be16_to_cpup(chip->xfer_buf);
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for (i = 0; i < len; i++)
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data[i] = be16_to_cpu(chip->xfer_buf[i]);
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return 0;
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}
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@ -1,7 +1,7 @@
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/*
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* AD714X CapTouch Programmable Controller driver (SPI bus)
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*
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* Copyright 2009 Analog Devices Inc.
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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@ -31,11 +31,12 @@ static int ad714x_spi_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
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static int ad714x_spi_read(struct ad714x_chip *chip,
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unsigned short reg, unsigned short *data)
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unsigned short reg, unsigned short *data, size_t len)
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{
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struct spi_device *spi = to_spi_device(chip->dev);
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struct spi_message message;
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struct spi_transfer xfer[2];
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int i;
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int error;
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spi_message_init(&message);
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@ -48,7 +49,7 @@ static int ad714x_spi_read(struct ad714x_chip *chip,
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spi_message_add_tail(&xfer[0], &message);
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xfer[1].rx_buf = &chip->xfer_buf[1];
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xfer[1].len = sizeof(chip->xfer_buf[1]);
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xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
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spi_message_add_tail(&xfer[1], &message);
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error = spi_sync(spi, &message);
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@ -57,7 +58,9 @@ static int ad714x_spi_read(struct ad714x_chip *chip,
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return error;
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}
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*data = be16_to_cpu(chip->xfer_buf[1]);
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for (i = 0; i < len; i++)
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data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
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return 0;
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}
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@ -1,7 +1,7 @@
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/*
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* AD714X CapTouch Programmable Controller driver supporting AD7142/3/7/8/7A
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*
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* Copyright 2009 Analog Devices Inc.
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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@ -123,6 +123,7 @@ struct ad714x_driver_data {
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* information to integrate all things which will be private data
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* of spi/i2c device
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*/
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static void ad714x_use_com_int(struct ad714x_chip *ad714x,
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int start_stage, int end_stage)
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{
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@ -131,11 +132,11 @@ static void ad714x_use_com_int(struct ad714x_chip *ad714x,
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mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1);
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data |= 1 << end_stage;
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ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1);
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data &= ~mask;
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ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
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}
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@ -148,11 +149,11 @@ static void ad714x_use_thr_int(struct ad714x_chip *ad714x,
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mask = ((1 << (end_stage + 1)) - 1) - ((1 << start_stage) - 1);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data, 1);
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data &= ~(1 << end_stage);
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ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data, 1);
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data |= mask;
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ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
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}
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@ -250,13 +251,16 @@ static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
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struct ad714x_slider_plat *hw = &ad714x->hw->slider[idx];
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int i;
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for (i = hw->start_stage; i <= hw->end_stage; i++) {
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ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
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ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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&ad714x->amb_reg[i]);
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ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage,
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&ad714x->adc_reg[hw->start_stage],
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hw->end_stage - hw->start_stage + 1);
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ad714x->sensor_val[i] = abs(ad714x->adc_reg[i] -
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ad714x->amb_reg[i]);
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for (i = hw->start_stage; i <= hw->end_stage; i++) {
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ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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&ad714x->amb_reg[i], 1);
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ad714x->sensor_val[i] =
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abs(ad714x->adc_reg[i] - ad714x->amb_reg[i]);
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}
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}
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@ -419,13 +423,16 @@ static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
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struct ad714x_wheel_plat *hw = &ad714x->hw->wheel[idx];
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int i;
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ad714x->read(ad714x, CDC_RESULT_S0 + hw->start_stage,
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&ad714x->adc_reg[hw->start_stage],
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hw->end_stage - hw->start_stage + 1);
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for (i = hw->start_stage; i <= hw->end_stage; i++) {
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ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
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ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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&ad714x->amb_reg[i]);
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&ad714x->amb_reg[i], 1);
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if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
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ad714x->sensor_val[i] = ad714x->adc_reg[i] -
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ad714x->amb_reg[i];
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ad714x->sensor_val[i] =
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ad714x->adc_reg[i] - ad714x->amb_reg[i];
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else
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ad714x->sensor_val[i] = 0;
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}
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@ -570,13 +577,16 @@ static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
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struct ad714x_touchpad_plat *hw = &ad714x->hw->touchpad[idx];
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int i;
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ad714x->read(ad714x, CDC_RESULT_S0 + hw->x_start_stage,
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&ad714x->adc_reg[hw->x_start_stage],
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hw->x_end_stage - hw->x_start_stage + 1);
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for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) {
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ad714x->read(ad714x, CDC_RESULT_S0 + i, &ad714x->adc_reg[i]);
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ad714x->read(ad714x, STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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&ad714x->amb_reg[i]);
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&ad714x->amb_reg[i], 1);
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if (ad714x->adc_reg[i] > ad714x->amb_reg[i])
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ad714x->sensor_val[i] = ad714x->adc_reg[i] -
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ad714x->amb_reg[i];
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ad714x->sensor_val[i] =
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ad714x->adc_reg[i] - ad714x->amb_reg[i];
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else
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ad714x->sensor_val[i] = 0;
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}
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@ -862,7 +872,7 @@ static int ad714x_hw_detect(struct ad714x_chip *ad714x)
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{
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unsigned short data;
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ad714x->read(ad714x, AD714X_PARTID_REG, &data);
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ad714x->read(ad714x, AD714X_PARTID_REG, &data, 1);
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switch (data & 0xFFF0) {
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case AD7142_PARTID:
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ad714x->product = 0x7142;
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@ -919,14 +929,12 @@ static void ad714x_hw_init(struct ad714x_chip *ad714x)
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ad714x->write(ad714x, AD714X_SYSCFG_REG + i,
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ad714x->hw->sys_cfg_reg[i]);
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for (i = 0; i < SYS_CFGREG_NUM; i++)
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ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data);
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ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data, 1);
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ad714x->write(ad714x, AD714X_STG_CAL_EN_REG, 0xFFF);
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/* clear all interrupts */
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
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}
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static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
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@ -936,9 +944,7 @@ static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
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mutex_lock(&ad714x->mutex);
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state);
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ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &ad714x->h_state);
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ad714x->read(ad714x, STG_COM_INT_STA_REG, &ad714x->c_state);
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
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for (i = 0; i < ad714x->hw->button_num; i++)
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ad714x_button_state_machine(ad714x, i);
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@ -1225,8 +1231,6 @@ EXPORT_SYMBOL(ad714x_disable);
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int ad714x_enable(struct ad714x_chip *ad714x)
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{
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unsigned short data;
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dev_dbg(ad714x->dev, "%s enter\n", __func__);
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mutex_lock(&ad714x->mutex);
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@ -1240,9 +1244,7 @@ int ad714x_enable(struct ad714x_chip *ad714x)
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* otherwise we will get no chance to enter falling-edge irq again
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*/
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_STA_REG, &data);
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ad714x->read(ad714x, STG_LOW_INT_STA_REG, &ad714x->l_state, 3);
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mutex_unlock(&ad714x->mutex);
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@ -1,7 +1,7 @@
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/*
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* AD714X CapTouch Programmable Controller driver (bus interfaces)
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*
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* Copyright 2009 Analog Devices Inc.
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* Copyright 2009-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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@ -18,12 +18,12 @@ struct ad714x_platform_data;
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struct ad714x_driver_data;
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struct ad714x_chip;
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typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *);
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typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *, size_t);
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typedef int (*ad714x_write_t)(struct ad714x_chip *, unsigned short, unsigned short);
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struct ad714x_chip {
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unsigned short h_state;
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unsigned short l_state;
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unsigned short h_state;
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unsigned short c_state;
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unsigned short adc_reg[STAGE_NUM];
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unsigned short amb_reg[STAGE_NUM];
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