diff options
Diffstat (limited to 'drivers/iio/imu/adis.c')
| -rw-r--r-- | drivers/iio/imu/adis.c | 139 |
1 files changed, 82 insertions, 57 deletions
diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c index e14c8536fd09..022bb54fb748 100644 --- a/drivers/iio/imu/adis.c +++ b/drivers/iio/imu/adis.c @@ -26,7 +26,14 @@ #define ADIS_MSC_CTRL_DATA_RDY_DIO2 BIT(0) #define ADIS_GLOB_CMD_SW_RESET BIT(7) -int adis_write_reg(struct adis *adis, unsigned int reg, +/** + * __adis_write_reg() - write N bytes to register (unlocked version) + * @adis: The adis device + * @reg: The address of the lower of the two registers + * @value: The value to write to device (up to 4 bytes) + * @size: The size of the @value (in bytes) + */ +int __adis_write_reg(struct adis *adis, unsigned int reg, unsigned int value, unsigned int size) { unsigned int page = reg / ADIS_PAGE_SIZE; @@ -38,7 +45,8 @@ int adis_write_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { @@ -46,7 +54,8 @@ int adis_write_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { @@ -54,24 +63,25 @@ int adis_write_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { .tx_buf = adis->tx + 6, .bits_per_word = 8, .len = 2, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, }, { .tx_buf = adis->tx + 8, .bits_per_word = 8, .len = 2, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, }, }; - mutex_lock(&adis->txrx_lock); - spi_message_init(&msg); if (adis->current_page != page) { @@ -96,8 +106,7 @@ int adis_write_reg(struct adis *adis, unsigned int reg, adis->tx[3] = value & 0xff; break; default: - ret = -EINVAL; - goto out_unlock; + return -EINVAL; } xfers[size].cs_change = 0; @@ -113,20 +122,18 @@ int adis_write_reg(struct adis *adis, unsigned int reg, adis->current_page = page; } -out_unlock: - mutex_unlock(&adis->txrx_lock); - return ret; } -EXPORT_SYMBOL_GPL(adis_write_reg); +EXPORT_SYMBOL_GPL(__adis_write_reg); /** - * adis_read_reg() - read 2 bytes from a 16-bit register + * __adis_read_reg() - read N bytes from register (unlocked version) * @adis: The adis device * @reg: The address of the lower of the two registers * @val: The value read back from the device + * @size: The size of the @val buffer */ -int adis_read_reg(struct adis *adis, unsigned int reg, +int __adis_read_reg(struct adis *adis, unsigned int reg, unsigned int *val, unsigned int size) { unsigned int page = reg / ADIS_PAGE_SIZE; @@ -138,7 +145,8 @@ int adis_read_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->write_delay, + .delay.value = adis->data->write_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { @@ -146,7 +154,8 @@ int adis_read_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->read_delay, + .delay.value = adis->data->read_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { @@ -155,18 +164,19 @@ int adis_read_reg(struct adis *adis, unsigned int reg, .bits_per_word = 8, .len = 2, .cs_change = 1, - .delay_usecs = adis->data->read_delay, + .delay.value = adis->data->read_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, .cs_change_delay.value = adis->data->cs_change_delay, .cs_change_delay.unit = SPI_DELAY_UNIT_USECS, }, { .rx_buf = adis->rx + 2, .bits_per_word = 8, .len = 2, - .delay_usecs = adis->data->read_delay, + .delay.value = adis->data->read_delay, + .delay.unit = SPI_DELAY_UNIT_USECS, }, }; - mutex_lock(&adis->txrx_lock); spi_message_init(&msg); if (adis->current_page != page) { @@ -188,15 +198,14 @@ int adis_read_reg(struct adis *adis, unsigned int reg, spi_message_add_tail(&xfers[3], &msg); break; default: - ret = -EINVAL; - goto out_unlock; + return -EINVAL; } ret = spi_sync(adis->spi, &msg); if (ret) { dev_err(&adis->spi->dev, "Failed to read register 0x%02X: %d\n", reg, ret); - goto out_unlock; + return ret; } else { adis->current_page = page; } @@ -210,12 +219,9 @@ int adis_read_reg(struct adis *adis, unsigned int reg, break; } -out_unlock: - mutex_unlock(&adis->txrx_lock); - return ret; } -EXPORT_SYMBOL_GPL(adis_read_reg); +EXPORT_SYMBOL_GPL(__adis_read_reg); #ifdef CONFIG_DEBUG_FS @@ -253,12 +259,16 @@ int adis_enable_irq(struct adis *adis, bool enable) int ret = 0; uint16_t msc; - if (adis->data->enable_irq) - return adis->data->enable_irq(adis, enable); + mutex_lock(&adis->state_lock); + + if (adis->data->enable_irq) { + ret = adis->data->enable_irq(adis, enable); + goto out_unlock; + } - ret = adis_read_reg_16(adis, adis->data->msc_ctrl_reg, &msc); + ret = __adis_read_reg_16(adis, adis->data->msc_ctrl_reg, &msc); if (ret) - goto error_ret; + goto out_unlock; msc |= ADIS_MSC_CTRL_DATA_RDY_POL_HIGH; msc &= ~ADIS_MSC_CTRL_DATA_RDY_DIO2; @@ -267,26 +277,27 @@ int adis_enable_irq(struct adis *adis, bool enable) else msc &= ~ADIS_MSC_CTRL_DATA_RDY_EN; - ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg, msc); + ret = __adis_write_reg_16(adis, adis->data->msc_ctrl_reg, msc); -error_ret: +out_unlock: + mutex_unlock(&adis->state_lock); return ret; } EXPORT_SYMBOL(adis_enable_irq); /** - * adis_check_status() - Check the device for error conditions + * __adis_check_status() - Check the device for error conditions (unlocked) * @adis: The adis device * * Returns 0 on success, a negative error code otherwise */ -int adis_check_status(struct adis *adis) +int __adis_check_status(struct adis *adis) { uint16_t status; int ret; int i; - ret = adis_read_reg_16(adis, adis->data->diag_stat_reg, &status); + ret = __adis_read_reg_16(adis, adis->data->diag_stat_reg, &status); if (ret) return ret; @@ -304,32 +315,38 @@ int adis_check_status(struct adis *adis) return -EIO; } -EXPORT_SYMBOL_GPL(adis_check_status); +EXPORT_SYMBOL_GPL(__adis_check_status); /** - * adis_reset() - Reset the device + * __adis_reset() - Reset the device (unlocked version) * @adis: The adis device * * Returns 0 on success, a negative error code otherwise */ -int adis_reset(struct adis *adis) +int __adis_reset(struct adis *adis) { int ret; + const struct adis_timeout *timeouts = adis->data->timeouts; - ret = adis_write_reg_8(adis, adis->data->glob_cmd_reg, + ret = __adis_write_reg_8(adis, adis->data->glob_cmd_reg, ADIS_GLOB_CMD_SW_RESET); - if (ret) + if (ret) { dev_err(&adis->spi->dev, "Failed to reset device: %d\n", ret); + return ret; + } - return ret; + msleep(timeouts->sw_reset_ms); + + return 0; } -EXPORT_SYMBOL_GPL(adis_reset); +EXPORT_SYMBOL_GPL(__adis_reset); static int adis_self_test(struct adis *adis) { int ret; + const struct adis_timeout *timeouts = adis->data->timeouts; - ret = adis_write_reg_16(adis, adis->data->msc_ctrl_reg, + ret = __adis_write_reg_16(adis, adis->data->msc_ctrl_reg, adis->data->self_test_mask); if (ret) { dev_err(&adis->spi->dev, "Failed to initiate self test: %d\n", @@ -337,12 +354,12 @@ static int adis_self_test(struct adis *adis) return ret; } - msleep(adis->data->startup_delay); + msleep(timeouts->self_test_ms); - ret = adis_check_status(adis); + ret = __adis_check_status(adis); if (adis->data->self_test_no_autoclear) - adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00); + __adis_write_reg_16(adis, adis->data->msc_ctrl_reg, 0x00); return ret; } @@ -360,19 +377,22 @@ int adis_initial_startup(struct adis *adis) { int ret; + mutex_lock(&adis->state_lock); + ret = adis_self_test(adis); if (ret) { dev_err(&adis->spi->dev, "Self-test failed, trying reset.\n"); - adis_reset(adis); - msleep(adis->data->startup_delay); + __adis_reset(adis); ret = adis_self_test(adis); if (ret) { dev_err(&adis->spi->dev, "Second self-test failed, giving up.\n"); - return ret; + goto out_unlock; } } - return 0; +out_unlock: + mutex_unlock(&adis->state_lock); + return ret; } EXPORT_SYMBOL_GPL(adis_initial_startup); @@ -398,15 +418,15 @@ int adis_single_conversion(struct iio_dev *indio_dev, unsigned int uval; int ret; - mutex_lock(&indio_dev->mlock); + mutex_lock(&adis->state_lock); - ret = adis_read_reg(adis, chan->address, &uval, + ret = __adis_read_reg(adis, chan->address, &uval, chan->scan_type.storagebits / 8); if (ret) goto err_unlock; if (uval & error_mask) { - ret = adis_check_status(adis); + ret = __adis_check_status(adis); if (ret) goto err_unlock; } @@ -418,7 +438,7 @@ int adis_single_conversion(struct iio_dev *indio_dev, ret = IIO_VAL_INT; err_unlock: - mutex_unlock(&indio_dev->mlock); + mutex_unlock(&adis->state_lock); return ret; } EXPORT_SYMBOL_GPL(adis_single_conversion); @@ -438,7 +458,12 @@ EXPORT_SYMBOL_GPL(adis_single_conversion); int adis_init(struct adis *adis, struct iio_dev *indio_dev, struct spi_device *spi, const struct adis_data *data) { - mutex_init(&adis->txrx_lock); + if (!data || !data->timeouts) { + dev_err(&spi->dev, "No config data or timeouts not defined!\n"); + return -EINVAL; + } + + mutex_init(&adis->state_lock); adis->spi = spi; adis->data = data; iio_device_set_drvdata(indio_dev, adis); |