diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad799x_core.c')
| -rw-r--r-- | drivers/staging/iio/adc/ad799x_core.c | 145 |
1 files changed, 141 insertions, 4 deletions
diff --git a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c index 979ec77..bcbf610 100644 --- a/drivers/staging/iio/adc/ad799x_core.c +++ b/drivers/staging/iio/adc/ad799x_core.c @@ -37,8 +37,144 @@ #include <linux/iio/sysfs.h> #include <linux/iio/events.h> #include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> -#include "ad799x.h" +#define AD799X_CHANNEL_SHIFT 4 +#define AD799X_STORAGEBITS 16 +/* + * AD7991, AD7995 and AD7999 defines + */ + +#define AD7991_REF_SEL 0x08 +#define AD7991_FLTR 0x04 +#define AD7991_BIT_TRIAL_DELAY 0x02 +#define AD7991_SAMPLE_DELAY 0x01 + +/* + * AD7992, AD7993, AD7994, AD7997 and AD7998 defines + */ + +#define AD7998_FLTR 0x08 +#define AD7998_ALERT_EN 0x04 +#define AD7998_BUSY_ALERT 0x02 +#define AD7998_BUSY_ALERT_POL 0x01 + +#define AD7998_CONV_RES_REG 0x0 +#define AD7998_ALERT_STAT_REG 0x1 +#define AD7998_CONF_REG 0x2 +#define AD7998_CYCLE_TMR_REG 0x3 + +#define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4) +#define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5) +#define AD7998_HYST_REG(x) ((x) * 3 + 0x6) + +#define AD7998_CYC_MASK 0x7 +#define AD7998_CYC_DIS 0x0 +#define AD7998_CYC_TCONF_32 0x1 +#define AD7998_CYC_TCONF_64 0x2 +#define AD7998_CYC_TCONF_128 0x3 +#define AD7998_CYC_TCONF_256 0x4 +#define AD7998_CYC_TCONF_512 0x5 +#define AD7998_CYC_TCONF_1024 0x6 +#define AD7998_CYC_TCONF_2048 0x7 + +#define AD7998_ALERT_STAT_CLEAR 0xFF + +/* + * AD7997 and AD7997 defines + */ + +#define AD7997_8_READ_SINGLE 0x80 +#define AD7997_8_READ_SEQUENCE 0x70 +/* TODO: move this into a common header */ +#define RES_MASK(bits) ((1 << (bits)) - 1) + +enum { + ad7991, + ad7995, + ad7999, + ad7992, + ad7993, + ad7994, + ad7997, + ad7998 +}; + +/** + * struct ad799x_chip_info - chip specifc information + * @channel: channel specification + * @num_channels: number of channels + * @monitor_mode: whether the chip supports monitor interrupts + * @default_config: device default configuration + * @event_attrs: pointer to the monitor event attribute group + */ +struct ad799x_chip_info { + struct iio_chan_spec channel[9]; + int num_channels; + u16 default_config; + const struct iio_info *info; +}; + +struct ad799x_state { + struct i2c_client *client; + const struct ad799x_chip_info *chip_info; + struct regulator *reg; + struct regulator *vref; + unsigned id; + u16 config; + + u8 *rx_buf; + unsigned int transfer_size; +}; + +/** + * ad799x_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 ad799x_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ad799x_state *st = iio_priv(indio_dev); + int b_sent; + u8 cmd; + + switch (st->id) { + case ad7991: + case ad7995: + case ad7999: + cmd = st->config | + (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT); + break; + case ad7992: + case ad7993: + case ad7994: + cmd = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) | + AD7998_CONV_RES_REG; + break; + case ad7997: + case ad7998: + cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG; + break; + default: + cmd = 0; + } + + b_sent = i2c_smbus_read_i2c_block_data(st->client, + cmd, st->transfer_size, st->rx_buf); + if (b_sent < 0) + goto out; + + iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf, + iio_get_time_ns()); +out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} /* * ad799x register access by I2C @@ -578,7 +714,8 @@ static int ad799x_probe(struct i2c_client *client, indio_dev->channels = st->chip_info->channel; indio_dev->num_channels = st->chip_info->num_channels; - ret = ad799x_register_ring_funcs_and_init(indio_dev); + ret = iio_triggered_buffer_setup(indio_dev, NULL, + &ad799x_trigger_handler, NULL); if (ret) goto error_disable_reg; @@ -601,7 +738,7 @@ static int ad799x_probe(struct i2c_client *client, return 0; error_cleanup_ring: - ad799x_ring_cleanup(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); error_disable_reg: if (!IS_ERR(st->vref)) regulator_disable(st->vref); @@ -618,7 +755,7 @@ static int ad799x_remove(struct i2c_client *client) iio_device_unregister(indio_dev); - ad799x_ring_cleanup(indio_dev); + iio_triggered_buffer_cleanup(indio_dev); if (!IS_ERR(st->vref)) regulator_disable(st->vref); if (!IS_ERR(st->reg)) |
