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Input: ad714x - use DMA-safe buffers for spi_write()
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:
parent
6337de2204
commit
c0409feb86
4 changed files with 129 additions and 101 deletions
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@ -27,40 +27,46 @@ static int ad714x_i2c_resume(struct device *dev)
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static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
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static int ad714x_i2c_write(struct device *dev, unsigned short reg,
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unsigned short data)
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static int ad714x_i2c_write(struct ad714x_chip *chip,
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unsigned short reg, unsigned short data)
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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret = 0;
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unsigned short tx[2] = {
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cpu_to_be16(reg),
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cpu_to_be16(data)
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};
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struct i2c_client *client = to_i2c_client(chip->dev);
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int error;
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ret = i2c_master_send(client, (u8 *)tx, 4);
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if (ret < 0)
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dev_err(&client->dev, "I2C write error\n");
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chip->xfer_buf[0] = cpu_to_be16(reg);
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chip->xfer_buf[1] = cpu_to_be16(data);
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return ret;
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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2 * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C write error: %d\n", error);
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return error;
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}
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return 0;
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}
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static int ad714x_i2c_read(struct device *dev, unsigned short reg,
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unsigned short *data)
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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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{
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struct i2c_client *client = to_i2c_client(dev);
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int ret = 0;
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unsigned short tx = cpu_to_be16(reg);
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struct i2c_client *client = to_i2c_client(chip->dev);
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int error;
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ret = i2c_master_send(client, (u8 *)&tx, 2);
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if (ret >= 0)
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ret = i2c_master_recv(client, (u8 *)data, 2);
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chip->xfer_buf[0] = cpu_to_be16(reg);
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if (unlikely(ret < 0))
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dev_err(&client->dev, "I2C read error\n");
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else
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*data = be16_to_cpu(*data);
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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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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return ret;
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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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return 0;
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}
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static int __devinit ad714x_i2c_probe(struct i2c_client *client,
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@ -30,31 +30,54 @@ 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 device *dev,
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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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{
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struct spi_device *spi = to_spi_device(dev);
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unsigned short tx = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
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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 error;
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spi_message_init(&message);
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memset(xfer, 0, sizeof(xfer));
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chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
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AD714x_SPI_READ | reg);
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int ret;
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xfer[0].tx_buf = &chip->xfer_buf[0];
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xfer[0].len = sizeof(chip->xfer_buf[0]);
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spi_message_add_tail(&xfer[0], &message);
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ret = spi_write_then_read(spi, &tx, 2, data, 2);
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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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spi_message_add_tail(&xfer[1], &message);
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*data = be16_to_cpup(data);
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error = spi_sync(spi, &message);
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if (unlikely(error)) {
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dev_err(chip->dev, "SPI read error: %d\n", error);
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return error;
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}
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return ret;
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*data = be16_to_cpu(chip->xfer_buf[1]);
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return 0;
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}
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static int ad714x_spi_write(struct device *dev,
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static int ad714x_spi_write(struct ad714x_chip *chip,
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unsigned short reg, unsigned short data)
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{
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struct spi_device *spi = to_spi_device(dev);
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unsigned short tx[2] = {
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cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg),
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cpu_to_be16(data)
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};
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struct spi_device *spi = to_spi_device(chip->dev);
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int error;
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return spi_write(spi, (u8 *)tx, 4);
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chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
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chip->xfer_buf[1] = cpu_to_be16(data);
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error = spi_write(spi, (u8 *)chip->xfer_buf,
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2 * sizeof(*chip->xfer_buf));
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if (unlikely(error)) {
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dev_err(chip->dev, "SPI write error: %d\n", error);
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return error;
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}
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return 0;
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}
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static int __devinit ad714x_spi_probe(struct spi_device *spi)
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@ -59,7 +59,6 @@
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#define STAGE11_AMBIENT 0x27D
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#define PER_STAGE_REG_NUM 36
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#define STAGE_NUM 12
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#define STAGE_CFGREG_NUM 8
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#define SYS_CFGREG_NUM 8
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@ -124,28 +123,6 @@ 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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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 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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unsigned short sensor_val[STAGE_NUM];
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struct ad714x_platform_data *hw;
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struct ad714x_driver_data *sw;
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int irq;
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struct device *dev;
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ad714x_read_t read;
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ad714x_write_t write;
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struct mutex mutex;
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unsigned product;
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unsigned version;
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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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@ -154,13 +131,13 @@ 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->dev, STG_COM_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
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data |= 1 << end_stage;
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ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data);
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ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
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ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
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data &= ~mask;
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ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data);
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ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
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}
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static void ad714x_use_thr_int(struct ad714x_chip *ad714x,
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@ -171,13 +148,13 @@ 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->dev, STG_COM_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_COM_INT_EN_REG, &data);
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data &= ~(1 << end_stage);
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ad714x->write(ad714x->dev, STG_COM_INT_EN_REG, data);
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ad714x->write(ad714x, STG_COM_INT_EN_REG, data);
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ad714x->read(ad714x->dev, STG_HIGH_INT_EN_REG, &data);
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ad714x->read(ad714x, STG_HIGH_INT_EN_REG, &data);
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data |= mask;
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ad714x->write(ad714x->dev, STG_HIGH_INT_EN_REG, data);
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ad714x->write(ad714x, STG_HIGH_INT_EN_REG, data);
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}
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static int ad714x_cal_highest_stage(struct ad714x_chip *ad714x,
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@ -274,10 +251,8 @@ static void ad714x_slider_cal_sensor_val(struct ad714x_chip *ad714x, int 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->dev, CDC_RESULT_S0 + i,
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&ad714x->adc_reg[i]);
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ad714x->read(ad714x->dev,
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STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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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->sensor_val[i] = abs(ad714x->adc_reg[i] -
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@ -445,10 +420,8 @@ static void ad714x_wheel_cal_sensor_val(struct ad714x_chip *ad714x, int 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->dev, CDC_RESULT_S0 + i,
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&ad714x->adc_reg[i]);
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ad714x->read(ad714x->dev,
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STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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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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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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@ -598,10 +571,8 @@ static void touchpad_cal_sensor_val(struct ad714x_chip *ad714x, int idx)
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int i;
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for (i = hw->x_start_stage; i <= hw->x_end_stage; i++) {
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ad714x->read(ad714x->dev, CDC_RESULT_S0 + i,
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&ad714x->adc_reg[i]);
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ad714x->read(ad714x->dev,
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STAGE0_AMBIENT + i * PER_STAGE_REG_NUM,
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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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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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@ -891,7 +862,7 @@ 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->dev, AD714X_PARTID_REG, &data);
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ad714x->read(ad714x, AD714X_PARTID_REG, &data);
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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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@ -940,23 +911,22 @@ static void ad714x_hw_init(struct ad714x_chip *ad714x)
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for (i = 0; i < STAGE_NUM; i++) {
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reg_base = AD714X_STAGECFG_REG + i * STAGE_CFGREG_NUM;
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for (j = 0; j < STAGE_CFGREG_NUM; j++)
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ad714x->write(ad714x->dev, reg_base + j,
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ad714x->write(ad714x, reg_base + j,
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ad714x->hw->stage_cfg_reg[i][j]);
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}
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for (i = 0; i < SYS_CFGREG_NUM; i++)
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ad714x->write(ad714x->dev, AD714X_SYSCFG_REG + i,
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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->dev, AD714X_SYSCFG_REG + i,
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&data);
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ad714x->read(ad714x, AD714X_SYSCFG_REG + i, &data);
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ad714x->write(ad714x->dev, AD714X_STG_CAL_EN_REG, 0xFFF);
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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->dev, STG_LOW_INT_STA_REG, &data);
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ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data);
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ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data);
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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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}
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static irqreturn_t ad714x_interrupt_thread(int irq, void *data)
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@ -966,9 +936,9 @@ 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->dev, STG_LOW_INT_STA_REG, &ad714x->l_state);
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ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &ad714x->h_state);
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ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &ad714x->c_state);
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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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for (i = 0; i < ad714x->hw->button_num; i++)
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ad714x_button_state_machine(ad714x, i);
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@ -1245,7 +1215,7 @@ int ad714x_disable(struct ad714x_chip *ad714x)
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mutex_lock(&ad714x->mutex);
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data = ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL] | 0x3;
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ad714x->write(ad714x->dev, AD714X_PWR_CTRL, data);
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ad714x->write(ad714x, AD714X_PWR_CTRL, data);
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mutex_unlock(&ad714x->mutex);
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@ -1263,16 +1233,16 @@ int ad714x_enable(struct ad714x_chip *ad714x)
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/* resume to non-shutdown mode */
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ad714x->write(ad714x->dev, AD714X_PWR_CTRL,
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ad714x->write(ad714x, AD714X_PWR_CTRL,
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ad714x->hw->sys_cfg_reg[AD714X_PWR_CTRL]);
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/* make sure the interrupt output line is not low level after resume,
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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->dev, STG_LOW_INT_STA_REG, &data);
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ad714x->read(ad714x->dev, STG_HIGH_INT_STA_REG, &data);
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ad714x->read(ad714x->dev, STG_COM_INT_STA_REG, &data);
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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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mutex_unlock(&ad714x->mutex);
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@ -11,11 +11,40 @@
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#include <linux/types.h>
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#define STAGE_NUM 12
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struct device;
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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 device *, unsigned short, unsigned short *);
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typedef int (*ad714x_write_t)(struct device *, unsigned short, unsigned short);
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typedef int (*ad714x_read_t)(struct ad714x_chip *, unsigned short, unsigned short *);
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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 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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unsigned short sensor_val[STAGE_NUM];
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struct ad714x_platform_data *hw;
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struct ad714x_driver_data *sw;
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int irq;
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struct device *dev;
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ad714x_read_t read;
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ad714x_write_t write;
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struct mutex mutex;
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unsigned product;
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unsigned version;
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__be16 xfer_buf[16] ____cacheline_aligned;
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};
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int ad714x_disable(struct ad714x_chip *ad714x);
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int ad714x_enable(struct ad714x_chip *ad714x);
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|
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Reference in a new issue