diff options
Diffstat (limited to 'drivers/staging/iio')
-rw-r--r-- | drivers/staging/iio/adc/Kconfig | 12 | ||||
-rw-r--r-- | drivers/staging/iio/adc/Makefile | 2 | ||||
-rw-r--r-- | drivers/staging/iio/adc/ad7298.c | 408 | ||||
-rw-r--r-- | drivers/staging/iio/adc/ad7298.h | 20 |
4 files changed, 0 insertions, 442 deletions
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 5086a46..dc8582b 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -10,18 +10,6 @@ config AD7291 Say yes here to build support for Analog Devices AD7291 8 Channel ADC with temperature sensor. -config AD7298 - tristate "Analog Devices AD7298 ADC driver" - depends on SPI - select IIO_BUFFER - select IIO_TRIGGERED_BUFFER - help - Say yes here to build support for Analog Devices AD7298 - 8 Channel ADC with temperature sensor. - - To compile this driver as a module, choose M here: the - module will be called ad7298. - config AD7606 tristate "Analog Devices AD7606 ADC driver" depends on GPIOLIB diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 4beaa58..7281451 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -12,8 +12,6 @@ ad799x-y := ad799x_core.o ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o obj-$(CONFIG_AD799X) += ad799x.o -obj-$(CONFIG_AD7298) += ad7298.o - obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7793) += ad7793.o diff --git a/drivers/staging/iio/adc/ad7298.c b/drivers/staging/iio/adc/ad7298.c deleted file mode 100644 index 2742a9d..0000000 --- a/drivers/staging/iio/adc/ad7298.c +++ /dev/null @@ -1,408 +0,0 @@ -/* - * AD7298 SPI ADC driver - * - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/spi/spi.h> -#include <linux/regulator/consumer.h> -#include <linux/err.h> -#include <linux/delay.h> -#include <linux/module.h> -#include <linux/interrupt.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include <linux/iio/buffer.h> -#include <linux/iio/trigger_consumer.h> -#include <linux/iio/triggered_buffer.h> - -#include "ad7298.h" - -#define AD7298_WRITE (1 << 15) /* write to the control register */ -#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */ -#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */ -#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */ -#define AD7298_EXTREF (1 << 2) /* external reference enable */ -#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */ -#define AD7298_PDD (1 << 0) /* partial power down enable */ - -#define AD7298_MAX_CHAN 8 -#define AD7298_BITS 12 -#define AD7298_STORAGE_BITS 16 -#define AD7298_INTREF_mV 2500 - -#define AD7298_CH_TEMP 9 - -#define RES_MASK(bits) ((1 << (bits)) - 1) - -struct ad7298_state { - struct spi_device *spi; - struct regulator *reg; - unsigned ext_ref; - struct spi_transfer ring_xfer[10]; - struct spi_transfer scan_single_xfer[3]; - struct spi_message ring_msg; - struct spi_message scan_single_msg; - /* - * DMA (thus cache coherency maintenance) requires the - * transfer buffers to live in their own cache lines. - */ - unsigned short rx_buf[12] ____cacheline_aligned; - unsigned short tx_buf[2]; -}; - -#define AD7298_V_CHAN(index) \ - { \ - .type = IIO_VOLTAGE, \ - .indexed = 1, \ - .channel = index, \ - .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \ - IIO_CHAN_INFO_SCALE_SHARED_BIT, \ - .address = index, \ - .scan_index = index, \ - .scan_type = { \ - .sign = 'u', \ - .realbits = 12, \ - .storagebits = 16, \ - .endianness = IIO_BE, \ - }, \ - } - -static const struct iio_chan_spec ad7298_channels[] = { - { - .type = IIO_TEMP, - .indexed = 1, - .channel = 0, - .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | - IIO_CHAN_INFO_SCALE_SEPARATE_BIT | - IIO_CHAN_INFO_OFFSET_SEPARATE_BIT, - .address = AD7298_CH_TEMP, - .scan_index = -1, - .scan_type = { - .sign = 's', - .realbits = 32, - .storagebits = 32, - }, - }, - AD7298_V_CHAN(0), - AD7298_V_CHAN(1), - AD7298_V_CHAN(2), - AD7298_V_CHAN(3), - AD7298_V_CHAN(4), - AD7298_V_CHAN(5), - AD7298_V_CHAN(6), - AD7298_V_CHAN(7), - IIO_CHAN_SOFT_TIMESTAMP(8), -}; - -/** - * ad7298_update_scan_mode() setup the spi transfer buffer for the new scan mask - **/ -static int ad7298_update_scan_mode(struct iio_dev *indio_dev, - const unsigned long *active_scan_mask) -{ - struct ad7298_state *st = iio_priv(indio_dev); - int i, m; - unsigned short command; - int scan_count; - - /* Now compute overall size */ - scan_count = bitmap_weight(active_scan_mask, indio_dev->masklength); - - command = AD7298_WRITE | st->ext_ref; - - for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1) - if (test_bit(i, active_scan_mask)) - command |= m; - - st->tx_buf[0] = cpu_to_be16(command); - - /* build spi ring message */ - st->ring_xfer[0].tx_buf = &st->tx_buf[0]; - st->ring_xfer[0].len = 2; - st->ring_xfer[0].cs_change = 1; - st->ring_xfer[1].tx_buf = &st->tx_buf[1]; - st->ring_xfer[1].len = 2; - st->ring_xfer[1].cs_change = 1; - - spi_message_init(&st->ring_msg); - spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg); - spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg); - - for (i = 0; i < scan_count; i++) { - st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i]; - st->ring_xfer[i + 2].len = 2; - st->ring_xfer[i + 2].cs_change = 1; - spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg); - } - /* make sure last transfer cs_change is not set */ - st->ring_xfer[i + 1].cs_change = 0; - - return 0; -} - -/** - * ad7298_trigger_handler() bh of trigger launched polling to ring buffer - * - * Currently there is no option in this driver to disable the saving of - * timestamps within the ring. - **/ -static irqreturn_t ad7298_trigger_handler(int irq, void *p) -{ - struct iio_poll_func *pf = p; - struct iio_dev *indio_dev = pf->indio_dev; - struct ad7298_state *st = iio_priv(indio_dev); - s64 time_ns = 0; - int b_sent; - - b_sent = spi_sync(st->spi, &st->ring_msg); - if (b_sent) - goto done; - - if (indio_dev->scan_timestamp) { - time_ns = iio_get_time_ns(); - memcpy((u8 *)st->rx_buf + indio_dev->scan_bytes - sizeof(s64), - &time_ns, sizeof(time_ns)); - } - - iio_push_to_buffers(indio_dev, (u8 *)st->rx_buf); - -done: - iio_trigger_notify_done(indio_dev->trig); - - return IRQ_HANDLED; -} - -static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch) -{ - int ret; - st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref | - (AD7298_CH(0) >> ch)); - - ret = spi_sync(st->spi, &st->scan_single_msg); - if (ret) - return ret; - - return be16_to_cpu(st->rx_buf[0]); -} - -static int ad7298_scan_temp(struct ad7298_state *st, int *val) -{ - int ret; - __be16 buf; - - buf = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE | - AD7298_TAVG | st->ext_ref); - - ret = spi_write(st->spi, (u8 *)&buf, 2); - if (ret) - return ret; - - buf = cpu_to_be16(0); - - ret = spi_write(st->spi, (u8 *)&buf, 2); - if (ret) - return ret; - - usleep_range(101, 1000); /* sleep > 100us */ - - ret = spi_read(st->spi, (u8 *)&buf, 2); - if (ret) - return ret; - - *val = sign_extend32(be16_to_cpu(buf), 11); - - return 0; -} - -static int ad7298_get_ref_voltage(struct ad7298_state *st) -{ - int vref; - - if (st->ext_ref) { - vref = regulator_get_voltage(st->reg); - if (vref < 0) - return vref; - - return vref / 1000; - } else { - return AD7298_INTREF_mV; - } -} - -static int ad7298_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - int ret; - struct ad7298_state *st = iio_priv(indio_dev); - - switch (m) { - case IIO_CHAN_INFO_RAW: - mutex_lock(&indio_dev->mlock); - if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { - ret = -EBUSY; - } else { - if (chan->address == AD7298_CH_TEMP) - ret = ad7298_scan_temp(st, val); - else - ret = ad7298_scan_direct(st, chan->address); - } - mutex_unlock(&indio_dev->mlock); - - if (ret < 0) - return ret; - - if (chan->address != AD7298_CH_TEMP) - *val = ret & RES_MASK(AD7298_BITS); - - return IIO_VAL_INT; - case IIO_CHAN_INFO_SCALE: - switch (chan->type) { - case IIO_VOLTAGE: - *val = ad7298_get_ref_voltage(st); - *val2 = chan->scan_type.realbits; - return IIO_VAL_FRACTIONAL_LOG2; - case IIO_TEMP: - *val = ad7298_get_ref_voltage(st); - *val2 = 10; - return IIO_VAL_FRACTIONAL; - default: - return -EINVAL; - } - case IIO_CHAN_INFO_OFFSET: - *val = 1093 - 2732500 / ad7298_get_ref_voltage(st); - return IIO_VAL_INT; - } - return -EINVAL; -} - -static const struct iio_info ad7298_info = { - .read_raw = &ad7298_read_raw, - .update_scan_mode = ad7298_update_scan_mode, - .driver_module = THIS_MODULE, -}; - -static int __devinit ad7298_probe(struct spi_device *spi) -{ - struct ad7298_platform_data *pdata = spi->dev.platform_data; - struct ad7298_state *st; - struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st)); - int ret; - - if (indio_dev == NULL) - return -ENOMEM; - - st = iio_priv(indio_dev); - - if (pdata && pdata->ext_ref) - st->ext_ref = AD7298_EXTREF; - - if (st->ext_ref) { - st->reg = regulator_get(&spi->dev, "vref"); - if (IS_ERR(st->reg)) { - ret = PTR_ERR(st->reg); - goto error_free; - } - ret = regulator_enable(st->reg); - if (ret) - goto error_put_reg; - } - - spi_set_drvdata(spi, indio_dev); - - st->spi = spi; - - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->dev.parent = &spi->dev; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = ad7298_channels; - indio_dev->num_channels = ARRAY_SIZE(ad7298_channels); - indio_dev->info = &ad7298_info; - - /* Setup default message */ - - st->scan_single_xfer[0].tx_buf = &st->tx_buf[0]; - st->scan_single_xfer[0].len = 2; - st->scan_single_xfer[0].cs_change = 1; - st->scan_single_xfer[1].tx_buf = &st->tx_buf[1]; - st->scan_single_xfer[1].len = 2; - st->scan_single_xfer[1].cs_change = 1; - st->scan_single_xfer[2].rx_buf = &st->rx_buf[0]; - st->scan_single_xfer[2].len = 2; - - spi_message_init(&st->scan_single_msg); - spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg); - spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg); - spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg); - - ret = iio_triggered_buffer_setup(indio_dev, NULL, - &ad7298_trigger_handler, NULL); - if (ret) - goto error_disable_reg; - - ret = iio_device_register(indio_dev); - if (ret) - goto error_cleanup_ring; - - return 0; - -error_cleanup_ring: - iio_triggered_buffer_cleanup(indio_dev); -error_disable_reg: - if (st->ext_ref) - regulator_disable(st->reg); -error_put_reg: - if (st->ext_ref) - regulator_put(st->reg); -error_free: - iio_device_free(indio_dev); - - return ret; -} - -static int __devexit ad7298_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad7298_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - iio_triggered_buffer_cleanup(indio_dev); - if (st->ext_ref) { - regulator_disable(st->reg); - regulator_put(st->reg); - } - iio_device_free(indio_dev); - - return 0; -} - -static const struct spi_device_id ad7298_id[] = { - {"ad7298", 0}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad7298_id); - -static struct spi_driver ad7298_driver = { - .driver = { - .name = "ad7298", - .owner = THIS_MODULE, - }, - .probe = ad7298_probe, - .remove = __devexit_p(ad7298_remove), - .id_table = ad7298_id, -}; -module_spi_driver(ad7298_driver); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("Analog Devices AD7298 ADC"); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/staging/iio/adc/ad7298.h b/drivers/staging/iio/adc/ad7298.h deleted file mode 100644 index c8ac969..0000000 --- a/drivers/staging/iio/adc/ad7298.h +++ /dev/null @@ -1,20 +0,0 @@ -/* - * AD7298 SPI ADC driver - * - * Copyright 2011 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#ifndef IIO_ADC_AD7298_H_ -#define IIO_ADC_AD7298_H_ - -/** - * struct ad7298_platform_data - Platform data for the ad7298 ADC driver - * @ext_ref: Whether to use an external reference voltage. - **/ -struct ad7298_platform_data { - bool ext_ref; -}; - -#endif /* IIO_ADC_AD7298_H_ */ |