| /* |
| * AD7792/AD7793 SPI ADC driver |
| * |
| * Copyright 2011 Analog Devices Inc. |
| * |
| * Licensed under the GPL-2. |
| */ |
| |
| #include <linux/interrupt.h> |
| #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/sched.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| |
| #include "../iio.h" |
| #include "../sysfs.h" |
| #include "../buffer_generic.h" |
| #include "../ring_sw.h" |
| #include "../trigger.h" |
| #include "../trigger_consumer.h" |
| |
| #include "ad7793.h" |
| |
| /* NOTE: |
| * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. |
| * In order to avoid contentions on the SPI bus, it's therefore necessary |
| * to use spi bus locking. |
| * |
| * The DOUT/RDY output must also be wired to an interrupt capable GPIO. |
| */ |
| |
| struct ad7793_chip_info { |
| struct iio_chan_spec channel[7]; |
| }; |
| |
| struct ad7793_state { |
| struct spi_device *spi; |
| struct iio_trigger *trig; |
| const struct ad7793_chip_info *chip_info; |
| struct regulator *reg; |
| struct ad7793_platform_data *pdata; |
| wait_queue_head_t wq_data_avail; |
| bool done; |
| bool irq_dis; |
| u16 int_vref_mv; |
| u16 mode; |
| u16 conf; |
| u32 scale_avail[8][2]; |
| /* Note this uses fact that 8 the mask always fits in a long */ |
| unsigned long available_scan_masks[7]; |
| /* |
| * DMA (thus cache coherency maintenance) requires the |
| * transfer buffers to live in their own cache lines. |
| */ |
| u8 data[4] ____cacheline_aligned; |
| }; |
| |
| enum ad7793_supported_device_ids { |
| ID_AD7792, |
| ID_AD7793, |
| }; |
| |
| static int __ad7793_write_reg(struct ad7793_state *st, bool locked, |
| bool cs_change, unsigned char reg, |
| unsigned size, unsigned val) |
| { |
| u8 *data = st->data; |
| struct spi_transfer t = { |
| .tx_buf = data, |
| .len = size + 1, |
| .cs_change = cs_change, |
| }; |
| struct spi_message m; |
| |
| data[0] = AD7793_COMM_WRITE | AD7793_COMM_ADDR(reg); |
| |
| switch (size) { |
| case 3: |
| data[1] = val >> 16; |
| data[2] = val >> 8; |
| data[3] = val; |
| break; |
| case 2: |
| data[1] = val >> 8; |
| data[2] = val; |
| break; |
| case 1: |
| data[1] = val; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t, &m); |
| |
| if (locked) |
| return spi_sync_locked(st->spi, &m); |
| else |
| return spi_sync(st->spi, &m); |
| } |
| |
| static int ad7793_write_reg(struct ad7793_state *st, |
| unsigned reg, unsigned size, unsigned val) |
| { |
| return __ad7793_write_reg(st, false, false, reg, size, val); |
| } |
| |
| static int __ad7793_read_reg(struct ad7793_state *st, bool locked, |
| bool cs_change, unsigned char reg, |
| int *val, unsigned size) |
| { |
| u8 *data = st->data; |
| int ret; |
| struct spi_transfer t[] = { |
| { |
| .tx_buf = data, |
| .len = 1, |
| }, { |
| .rx_buf = data, |
| .len = size, |
| .cs_change = cs_change, |
| }, |
| }; |
| struct spi_message m; |
| |
| data[0] = AD7793_COMM_READ | AD7793_COMM_ADDR(reg); |
| |
| spi_message_init(&m); |
| spi_message_add_tail(&t[0], &m); |
| spi_message_add_tail(&t[1], &m); |
| |
| if (locked) |
| ret = spi_sync_locked(st->spi, &m); |
| else |
| ret = spi_sync(st->spi, &m); |
| |
| if (ret < 0) |
| return ret; |
| |
| switch (size) { |
| case 3: |
| *val = data[0] << 16 | data[1] << 8 | data[2]; |
| break; |
| case 2: |
| *val = data[0] << 8 | data[1]; |
| break; |
| case 1: |
| *val = data[0]; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int ad7793_read_reg(struct ad7793_state *st, |
| unsigned reg, int *val, unsigned size) |
| { |
| return __ad7793_read_reg(st, 0, 0, reg, val, size); |
| } |
| |
| static int ad7793_read(struct ad7793_state *st, unsigned ch, |
| unsigned len, int *val) |
| { |
| int ret; |
| st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | AD7793_CONF_CHAN(ch); |
| st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | |
| AD7793_MODE_SEL(AD7793_MODE_SINGLE); |
| |
| ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| st->done = false; |
| |
| ret = __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| if (ret < 0) |
| goto out; |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| ret = __ad7793_read_reg(st, 1, 0, AD7793_REG_DATA, val, len); |
| out: |
| spi_bus_unlock(st->spi->master); |
| |
| return ret; |
| } |
| |
| static int ad7793_calibrate(struct ad7793_state *st, unsigned mode, unsigned ch) |
| { |
| int ret; |
| |
| st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | AD7793_CONF_CHAN(ch); |
| st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | AD7793_MODE_SEL(mode); |
| |
| ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| st->done = false; |
| |
| ret = __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| if (ret < 0) |
| goto out; |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | |
| AD7793_MODE_SEL(AD7793_MODE_IDLE); |
| |
| ret = __ad7793_write_reg(st, 1, 0, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| out: |
| spi_bus_unlock(st->spi->master); |
| |
| return ret; |
| } |
| |
| static const u8 ad7793_calib_arr[6][2] = { |
| {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, |
| {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, |
| {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, |
| {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, |
| {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, |
| {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} |
| }; |
| |
| static int ad7793_calibrate_all(struct ad7793_state *st) |
| { |
| int i, ret; |
| |
| for (i = 0; i < ARRAY_SIZE(ad7793_calib_arr); i++) { |
| ret = ad7793_calibrate(st, ad7793_calib_arr[i][0], |
| ad7793_calib_arr[i][1]); |
| if (ret) |
| goto out; |
| } |
| |
| return 0; |
| out: |
| dev_err(&st->spi->dev, "Calibration failed\n"); |
| return ret; |
| } |
| |
| static int ad7793_setup(struct ad7793_state *st) |
| { |
| int i, ret = -1; |
| unsigned long long scale_uv; |
| u32 id; |
| |
| /* reset the serial interface */ |
| ret = spi_write(st->spi, (u8 *)&ret, sizeof(ret)); |
| if (ret < 0) |
| goto out; |
| msleep(1); /* Wait for at least 500us */ |
| |
| /* write/read test for device presence */ |
| ret = ad7793_read_reg(st, AD7793_REG_ID, &id, 1); |
| if (ret) |
| goto out; |
| |
| id &= AD7793_ID_MASK; |
| |
| if (!((id == AD7792_ID) || (id == AD7793_ID))) { |
| dev_err(&st->spi->dev, "device ID query failed\n"); |
| goto out; |
| } |
| |
| st->mode = (st->pdata->mode & ~AD7793_MODE_SEL(-1)) | |
| AD7793_MODE_SEL(AD7793_MODE_IDLE); |
| st->conf = st->pdata->conf & ~AD7793_CONF_CHAN(-1); |
| |
| ret = ad7793_write_reg(st, AD7793_REG_MODE, sizeof(st->mode), st->mode); |
| if (ret) |
| goto out; |
| |
| ret = ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); |
| if (ret) |
| goto out; |
| |
| ret = ad7793_write_reg(st, AD7793_REG_IO, |
| sizeof(st->pdata->io), st->pdata->io); |
| if (ret) |
| goto out; |
| |
| ret = ad7793_calibrate_all(st); |
| if (ret) |
| goto out; |
| |
| /* Populate available ADC input ranges */ |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { |
| scale_uv = ((u64)st->int_vref_mv * 100000000) |
| >> (st->chip_info->channel[0].scan_type.realbits - |
| (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); |
| scale_uv >>= i; |
| |
| st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; |
| st->scale_avail[i][0] = scale_uv; |
| } |
| |
| return 0; |
| out: |
| dev_err(&st->spi->dev, "setup failed\n"); |
| return ret; |
| } |
| |
| static int ad7793_scan_from_ring(struct ad7793_state *st, unsigned ch, int *val) |
| { |
| struct iio_buffer *ring = iio_priv_to_dev(st)->buffer; |
| int ret; |
| s64 dat64[2]; |
| u32 *dat32 = (u32 *)dat64; |
| |
| if (!(test_bit(ch, ring->scan_mask))) |
| return -EBUSY; |
| |
| ret = ring->access->read_last(ring, (u8 *) &dat64); |
| if (ret) |
| return ret; |
| |
| *val = *dat32; |
| |
| return 0; |
| } |
| |
| static int ad7793_ring_preenable(struct iio_dev *indio_dev) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| struct iio_buffer *ring = indio_dev->buffer; |
| size_t d_size; |
| unsigned channel; |
| |
| if (!ring->scan_count) |
| return -EINVAL; |
| |
| channel = find_first_bit(ring->scan_mask, |
| indio_dev->masklength); |
| |
| d_size = ring->scan_count * |
| indio_dev->channels[0].scan_type.storagebits / 8; |
| |
| if (ring->scan_timestamp) { |
| d_size += sizeof(s64); |
| |
| if (d_size % sizeof(s64)) |
| d_size += sizeof(s64) - (d_size % sizeof(s64)); |
| } |
| |
| if (indio_dev->buffer->access->set_bytes_per_datum) |
| indio_dev->buffer->access-> |
| set_bytes_per_datum(indio_dev->buffer, d_size); |
| |
| st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | |
| AD7793_MODE_SEL(AD7793_MODE_CONT); |
| st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | |
| AD7793_CONF_CHAN(indio_dev->channels[channel].address); |
| |
| ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); |
| |
| spi_bus_lock(st->spi->master); |
| __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| |
| return 0; |
| } |
| |
| static int ad7793_ring_postdisable(struct iio_dev *indio_dev) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| |
| st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | |
| AD7793_MODE_SEL(AD7793_MODE_IDLE); |
| |
| st->done = false; |
| wait_event_interruptible(st->wq_data_avail, st->done); |
| |
| if (!st->irq_dis) |
| disable_irq_nosync(st->spi->irq); |
| |
| __ad7793_write_reg(st, 1, 0, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| |
| return spi_bus_unlock(st->spi->master); |
| } |
| |
| /** |
| * ad7793_trigger_handler() bh of trigger launched polling to ring buffer |
| **/ |
| |
| static irqreturn_t ad7793_trigger_handler(int irq, void *p) |
| { |
| struct iio_poll_func *pf = p; |
| struct iio_dev *indio_dev = pf->indio_dev; |
| struct iio_buffer *ring = indio_dev->buffer; |
| struct ad7793_state *st = iio_priv(indio_dev); |
| s64 dat64[2]; |
| s32 *dat32 = (s32 *)dat64; |
| |
| if (ring->scan_count) |
| __ad7793_read_reg(st, 1, 1, AD7793_REG_DATA, |
| dat32, |
| indio_dev->channels[0].scan_type.realbits/8); |
| |
| /* Guaranteed to be aligned with 8 byte boundary */ |
| if (ring->scan_timestamp) |
| dat64[1] = pf->timestamp; |
| |
| ring->access->store_to(ring, (u8 *)dat64, pf->timestamp); |
| |
| iio_trigger_notify_done(indio_dev->trig); |
| st->irq_dis = false; |
| enable_irq(st->spi->irq); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static const struct iio_buffer_setup_ops ad7793_ring_setup_ops = { |
| .preenable = &ad7793_ring_preenable, |
| .postenable = &iio_triggered_buffer_postenable, |
| .predisable = &iio_triggered_buffer_predisable, |
| .postdisable = &ad7793_ring_postdisable, |
| }; |
| |
| static int ad7793_register_ring_funcs_and_init(struct iio_dev *indio_dev) |
| { |
| int ret; |
| |
| indio_dev->buffer = iio_sw_rb_allocate(indio_dev); |
| if (!indio_dev->buffer) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| /* Effectively select the ring buffer implementation */ |
| indio_dev->buffer->access = &ring_sw_access_funcs; |
| indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time, |
| &ad7793_trigger_handler, |
| IRQF_ONESHOT, |
| indio_dev, |
| "ad7793_consumer%d", |
| indio_dev->id); |
| if (indio_dev->pollfunc == NULL) { |
| ret = -ENOMEM; |
| goto error_deallocate_sw_rb; |
| } |
| |
| /* Ring buffer functions - here trigger setup related */ |
| indio_dev->buffer->setup_ops = &ad7793_ring_setup_ops; |
| |
| /* Flag that polled ring buffering is possible */ |
| indio_dev->modes |= INDIO_BUFFER_TRIGGERED; |
| return 0; |
| |
| error_deallocate_sw_rb: |
| iio_sw_rb_free(indio_dev->buffer); |
| error_ret: |
| return ret; |
| } |
| |
| static void ad7793_ring_cleanup(struct iio_dev *indio_dev) |
| { |
| iio_dealloc_pollfunc(indio_dev->pollfunc); |
| iio_sw_rb_free(indio_dev->buffer); |
| } |
| |
| /** |
| * ad7793_data_rdy_trig_poll() the event handler for the data rdy trig |
| **/ |
| static irqreturn_t ad7793_data_rdy_trig_poll(int irq, void *private) |
| { |
| struct ad7793_state *st = iio_priv(private); |
| |
| st->done = true; |
| wake_up_interruptible(&st->wq_data_avail); |
| disable_irq_nosync(irq); |
| st->irq_dis = true; |
| iio_trigger_poll(st->trig, iio_get_time_ns()); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int ad7793_probe_trigger(struct iio_dev *indio_dev) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| int ret; |
| |
| st->trig = iio_allocate_trigger("%s-dev%d", |
| spi_get_device_id(st->spi)->name, |
| indio_dev->id); |
| if (st->trig == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| ret = request_irq(st->spi->irq, |
| ad7793_data_rdy_trig_poll, |
| IRQF_TRIGGER_LOW, |
| spi_get_device_id(st->spi)->name, |
| indio_dev); |
| if (ret) |
| goto error_free_trig; |
| |
| disable_irq_nosync(st->spi->irq); |
| st->irq_dis = true; |
| st->trig->dev.parent = &st->spi->dev; |
| st->trig->owner = THIS_MODULE; |
| st->trig->private_data = indio_dev; |
| |
| ret = iio_trigger_register(st->trig); |
| |
| /* select default trigger */ |
| indio_dev->trig = st->trig; |
| if (ret) |
| goto error_free_irq; |
| |
| return 0; |
| |
| error_free_irq: |
| free_irq(st->spi->irq, indio_dev); |
| error_free_trig: |
| iio_free_trigger(st->trig); |
| error_ret: |
| return ret; |
| } |
| |
| static void ad7793_remove_trigger(struct iio_dev *indio_dev) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| |
| iio_trigger_unregister(st->trig); |
| free_irq(st->spi->irq, indio_dev); |
| iio_free_trigger(st->trig); |
| } |
| |
| static const u16 sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 33, 19, |
| 17, 16, 12, 10, 8, 6, 4}; |
| |
| static ssize_t ad7793_read_frequency(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7793_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", |
| sample_freq_avail[AD7793_MODE_RATE(st->mode)]); |
| } |
| |
| static ssize_t ad7793_write_frequency(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7793_state *st = iio_priv(indio_dev); |
| long lval; |
| int i, ret; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| mutex_unlock(&indio_dev->mlock); |
| |
| ret = strict_strtol(buf, 10, &lval); |
| if (ret) |
| return ret; |
| |
| ret = -EINVAL; |
| |
| for (i = 0; i < ARRAY_SIZE(sample_freq_avail); i++) |
| if (lval == sample_freq_avail[i]) { |
| mutex_lock(&indio_dev->mlock); |
| st->mode &= ~AD7793_MODE_RATE(-1); |
| st->mode |= AD7793_MODE_RATE(i); |
| ad7793_write_reg(st, AD7793_REG_MODE, |
| sizeof(st->mode), st->mode); |
| mutex_unlock(&indio_dev->mlock); |
| ret = 0; |
| } |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, |
| ad7793_read_frequency, |
| ad7793_write_frequency); |
| |
| static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( |
| "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); |
| |
| static ssize_t ad7793_show_scale_available(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| struct ad7793_state *st = iio_priv(indio_dev); |
| int i, len = 0; |
| |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) |
| len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0], |
| st->scale_avail[i][1]); |
| |
| len += sprintf(buf + len, "\n"); |
| |
| return len; |
| } |
| |
| static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available, in-in_scale_available, |
| S_IRUGO, ad7793_show_scale_available, NULL, 0); |
| |
| static struct attribute *ad7793_attributes[] = { |
| &iio_dev_attr_sampling_frequency.dev_attr.attr, |
| &iio_const_attr_sampling_frequency_available.dev_attr.attr, |
| &iio_dev_attr_in_m_in_scale_available.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group ad7793_attribute_group = { |
| .attrs = ad7793_attributes, |
| }; |
| |
| static int ad7793_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long m) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| int ret, smpl = 0; |
| unsigned long long scale_uv; |
| bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); |
| |
| switch (m) { |
| case 0: |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) |
| ret = ad7793_scan_from_ring(st, |
| chan->scan_index, &smpl); |
| else |
| ret = ad7793_read(st, chan->address, |
| chan->scan_type.realbits / 8, &smpl); |
| mutex_unlock(&indio_dev->mlock); |
| |
| if (ret < 0) |
| return ret; |
| |
| *val = (smpl >> chan->scan_type.shift) & |
| ((1 << (chan->scan_type.realbits)) - 1); |
| |
| if (!unipolar) |
| *val -= (1 << (chan->scan_type.realbits - 1)); |
| |
| return IIO_VAL_INT; |
| |
| case (1 << IIO_CHAN_INFO_SCALE_SHARED): |
| *val = st->scale_avail[(st->conf >> 8) & 0x7][0]; |
| *val2 = st->scale_avail[(st->conf >> 8) & 0x7][1]; |
| |
| return IIO_VAL_INT_PLUS_NANO; |
| |
| case (1 << IIO_CHAN_INFO_SCALE_SEPARATE): |
| switch (chan->type) { |
| case IIO_VOLTAGE: |
| /* 1170mV / 2^23 * 6 */ |
| scale_uv = (1170ULL * 100000000ULL * 6ULL) |
| >> (chan->scan_type.realbits - |
| (unipolar ? 0 : 1)); |
| break; |
| case IIO_TEMP: |
| /* Always uses unity gain and internal ref */ |
| scale_uv = (2500ULL * 100000000ULL) |
| >> (chan->scan_type.realbits - |
| (unipolar ? 0 : 1)); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| *val2 = do_div(scale_uv, 100000000) * 10; |
| *val = scale_uv; |
| |
| return IIO_VAL_INT_PLUS_NANO; |
| } |
| return -EINVAL; |
| } |
| |
| static int ad7793_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct ad7793_state *st = iio_priv(indio_dev); |
| int ret, i; |
| unsigned int tmp; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| switch (mask) { |
| case (1 << IIO_CHAN_INFO_SCALE_SHARED): |
| ret = -EINVAL; |
| for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) |
| if (val2 == st->scale_avail[i][1]) { |
| tmp = st->conf; |
| st->conf &= ~AD7793_CONF_GAIN(-1); |
| st->conf |= AD7793_CONF_GAIN(i); |
| |
| if (tmp != st->conf) { |
| ad7793_write_reg(st, AD7793_REG_CONF, |
| sizeof(st->conf), |
| st->conf); |
| ad7793_calibrate_all(st); |
| } |
| ret = 0; |
| } |
| |
| default: |
| ret = -EINVAL; |
| } |
| |
| mutex_unlock(&indio_dev->mlock); |
| return ret; |
| } |
| |
| static int ad7793_validate_trigger(struct iio_dev *indio_dev, |
| struct iio_trigger *trig) |
| { |
| if (indio_dev->trig != trig) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| long mask) |
| { |
| return IIO_VAL_INT_PLUS_NANO; |
| } |
| |
| static const struct iio_info ad7793_info = { |
| .read_raw = &ad7793_read_raw, |
| .write_raw = &ad7793_write_raw, |
| .write_raw_get_fmt = &ad7793_write_raw_get_fmt, |
| .attrs = &ad7793_attribute_group, |
| .validate_trigger = ad7793_validate_trigger, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { |
| [ID_AD7793] = { |
| .channel[0] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 0, |
| .channel2 = 0, |
| .address = AD7793_CH_AIN1P_AIN1M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 0, |
| .scan_type = IIO_ST('s', 24, 32, 0) |
| }, |
| .channel[1] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 1, |
| .channel2 = 1, |
| .address = AD7793_CH_AIN2P_AIN2M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 1, |
| .scan_type = IIO_ST('s', 24, 32, 0) |
| }, |
| .channel[2] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 2, |
| .channel2 = 2, |
| .address = AD7793_CH_AIN3P_AIN3M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 2, |
| .scan_type = IIO_ST('s', 24, 32, 0) |
| }, |
| .channel[3] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .extend_name = "shorted", |
| .indexed = 1, |
| .channel = 2, |
| .channel2 = 2, |
| .address = AD7793_CH_AIN1M_AIN1M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 2, |
| .scan_type = IIO_ST('s', 24, 32, 0) |
| }, |
| .channel[4] = { |
| .type = IIO_TEMP, |
| .indexed = 1, |
| .channel = 0, |
| .address = AD7793_CH_TEMP, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| .scan_index = 4, |
| .scan_type = IIO_ST('s', 24, 32, 0), |
| }, |
| .channel[5] = { |
| .type = IIO_VOLTAGE, |
| .extend_name = "supply", |
| .indexed = 1, |
| .channel = 4, |
| .address = AD7793_CH_AVDD_MONITOR, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| .scan_index = 5, |
| .scan_type = IIO_ST('s', 24, 32, 0), |
| }, |
| .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6), |
| }, |
| [ID_AD7792] = { |
| .channel[0] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 0, |
| .channel2 = 0, |
| .address = AD7793_CH_AIN1P_AIN1M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 0, |
| .scan_type = IIO_ST('s', 16, 32, 0) |
| }, |
| .channel[1] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 1, |
| .channel2 = 1, |
| .address = AD7793_CH_AIN2P_AIN2M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 1, |
| .scan_type = IIO_ST('s', 16, 32, 0) |
| }, |
| .channel[2] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .indexed = 1, |
| .channel = 2, |
| .channel2 = 2, |
| .address = AD7793_CH_AIN3P_AIN3M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 2, |
| .scan_type = IIO_ST('s', 16, 32, 0) |
| }, |
| .channel[3] = { |
| .type = IIO_VOLTAGE, |
| .differential = 1, |
| .extend_name = "shorted", |
| .indexed = 1, |
| .channel = 2, |
| .channel2 = 2, |
| .address = AD7793_CH_AIN1M_AIN1M, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), |
| .scan_index = 2, |
| .scan_type = IIO_ST('s', 16, 32, 0) |
| }, |
| .channel[4] = { |
| .type = IIO_TEMP, |
| .indexed = 1, |
| .channel = 0, |
| .address = AD7793_CH_TEMP, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| .scan_index = 4, |
| .scan_type = IIO_ST('s', 16, 32, 0), |
| }, |
| .channel[5] = { |
| .type = IIO_VOLTAGE, |
| .extend_name = "supply", |
| .indexed = 1, |
| .channel = 4, |
| .address = AD7793_CH_AVDD_MONITOR, |
| .info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), |
| .scan_index = 5, |
| .scan_type = IIO_ST('s', 16, 32, 0), |
| }, |
| .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6), |
| }, |
| }; |
| |
| static int __devinit ad7793_probe(struct spi_device *spi) |
| { |
| struct ad7793_platform_data *pdata = spi->dev.platform_data; |
| struct ad7793_state *st; |
| struct iio_dev *indio_dev; |
| int ret, i, voltage_uv = 0; |
| |
| if (!pdata) { |
| dev_err(&spi->dev, "no platform data?\n"); |
| return -ENODEV; |
| } |
| |
| if (!spi->irq) { |
| dev_err(&spi->dev, "no IRQ?\n"); |
| return -ENODEV; |
| } |
| |
| indio_dev = iio_allocate_device(sizeof(*st)); |
| if (indio_dev == NULL) |
| return -ENOMEM; |
| |
| st = iio_priv(indio_dev); |
| |
| st->reg = regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(st->reg)) { |
| ret = regulator_enable(st->reg); |
| if (ret) |
| goto error_put_reg; |
| |
| voltage_uv = regulator_get_voltage(st->reg); |
| } |
| |
| st->chip_info = |
| &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; |
| |
| st->pdata = pdata; |
| |
| if (pdata && pdata->vref_mv) |
| st->int_vref_mv = pdata->vref_mv; |
| else if (voltage_uv) |
| st->int_vref_mv = voltage_uv / 1000; |
| else |
| st->int_vref_mv = 2500; /* Build-in ref */ |
| |
| spi_set_drvdata(spi, indio_dev); |
| st->spi = spi; |
| |
| indio_dev->dev.parent = &spi->dev; |
| indio_dev->name = spi_get_device_id(spi)->name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = st->chip_info->channel; |
| indio_dev->available_scan_masks = st->available_scan_masks; |
| indio_dev->num_channels = 7; |
| indio_dev->info = &ad7793_info; |
| |
| for (i = 0; i < indio_dev->num_channels; i++) { |
| set_bit(i, &st->available_scan_masks[i]); |
| set_bit(indio_dev-> |
| channels[indio_dev->num_channels - 1].scan_index, |
| &st->available_scan_masks[i]); |
| } |
| |
| init_waitqueue_head(&st->wq_data_avail); |
| |
| ret = ad7793_register_ring_funcs_and_init(indio_dev); |
| if (ret) |
| goto error_disable_reg; |
| |
| ret = ad7793_probe_trigger(indio_dev); |
| if (ret) |
| goto error_unreg_ring; |
| |
| ret = iio_buffer_register(indio_dev, |
| indio_dev->channels, |
| indio_dev->num_channels); |
| if (ret) |
| goto error_remove_trigger; |
| |
| ret = ad7793_setup(st); |
| if (ret) |
| goto error_uninitialize_ring; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto error_uninitialize_ring; |
| |
| return 0; |
| |
| error_uninitialize_ring: |
| iio_buffer_unregister(indio_dev); |
| error_remove_trigger: |
| ad7793_remove_trigger(indio_dev); |
| error_unreg_ring: |
| ad7793_ring_cleanup(indio_dev); |
| error_disable_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| error_put_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_put(st->reg); |
| |
| iio_free_device(indio_dev); |
| |
| return ret; |
| } |
| |
| static int ad7793_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| struct ad7793_state *st = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| iio_buffer_unregister(indio_dev); |
| ad7793_remove_trigger(indio_dev); |
| ad7793_ring_cleanup(indio_dev); |
| |
| if (!IS_ERR(st->reg)) { |
| regulator_disable(st->reg); |
| regulator_put(st->reg); |
| } |
| |
| iio_free_device(indio_dev); |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad7793_id[] = { |
| {"ad7792", ID_AD7792}, |
| {"ad7793", ID_AD7793}, |
| {} |
| }; |
| |
| static struct spi_driver ad7793_driver = { |
| .driver = { |
| .name = "ad7793", |
| .bus = &spi_bus_type, |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad7793_probe, |
| .remove = __devexit_p(ad7793_remove), |
| .id_table = ad7793_id, |
| }; |
| |
| static int __init ad7793_init(void) |
| { |
| return spi_register_driver(&ad7793_driver); |
| } |
| module_init(ad7793_init); |
| |
| static void __exit ad7793_exit(void) |
| { |
| spi_unregister_driver(&ad7793_driver); |
| } |
| module_exit(ad7793_exit); |
| |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Analog Devices AD7792/3 ADC"); |
| MODULE_LICENSE("GPL v2"); |