2 * ADE7758 Poly Phase Multifunction Energy Metering IC driver
4 * Copyright 2010-2011 Analog Devices Inc.
6 * Licensed under the GPL-2.
8 #include <linux/export.h>
9 #include <linux/interrupt.h>
10 #include <linux/kernel.h>
11 #include <linux/spi/spi.h>
12 #include <linux/slab.h>
13 #include <asm/unaligned.h>
15 #include <linux/iio/iio.h>
16 #include <linux/iio/kfifo_buf.h>
17 #include <linux/iio/trigger_consumer.h>
21 * ade7758_spi_read_burst() - read data registers
22 * @indio_dev: the IIO device
24 static int ade7758_spi_read_burst(struct iio_dev *indio_dev)
26 struct ade7758_state *st = iio_priv(indio_dev);
29 ret = spi_sync(st->us, &st->ring_msg);
31 dev_err(&st->us->dev, "problem when reading WFORM value\n");
36 static int ade7758_write_waveform_type(struct device *dev, unsigned type)
41 ret = ade7758_spi_read_reg_8(dev,
50 ret = ade7758_spi_write_reg_8(dev,
57 /* Whilst this makes a lot of calls to iio_sw_ring functions - it is to device
58 * specific to be rolled into the core.
60 static irqreturn_t ade7758_trigger_handler(int irq, void *p)
62 struct iio_poll_func *pf = p;
63 struct iio_dev *indio_dev = pf->indio_dev;
64 struct ade7758_state *st = iio_priv(indio_dev);
66 u32 *dat32 = (u32 *)dat64;
68 if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
69 if (ade7758_spi_read_burst(indio_dev) >= 0)
70 *dat32 = get_unaligned_be32(&st->rx_buf[5]) & 0xFFFFFF;
72 /* Guaranteed to be aligned with 8 byte boundary */
73 if (indio_dev->scan_timestamp)
74 dat64[1] = pf->timestamp;
76 iio_push_to_buffers(indio_dev, (u8 *)dat64);
78 iio_trigger_notify_done(indio_dev->trig);
84 * ade7758_ring_preenable() setup the parameters of the ring before enabling
86 * The complex nature of the setting of the number of bytes per datum is due
87 * to this driver currently ensuring that the timestamp is stored at an 8
90 static int ade7758_ring_preenable(struct iio_dev *indio_dev)
92 struct ade7758_state *st = iio_priv(indio_dev);
96 if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
99 ret = iio_sw_buffer_preenable(indio_dev);
103 channel = find_first_bit(indio_dev->active_scan_mask,
104 indio_dev->masklength);
106 ade7758_write_waveform_type(&indio_dev->dev,
107 st->ade7758_ring_channels[channel].address);
112 static const struct iio_buffer_setup_ops ade7758_ring_setup_ops = {
113 .preenable = &ade7758_ring_preenable,
114 .postenable = &iio_triggered_buffer_postenable,
115 .predisable = &iio_triggered_buffer_predisable,
116 .validate_scan_mask = &iio_validate_scan_mask_onehot,
119 void ade7758_unconfigure_ring(struct iio_dev *indio_dev)
121 iio_dealloc_pollfunc(indio_dev->pollfunc);
122 iio_kfifo_free(indio_dev->buffer);
125 int ade7758_configure_ring(struct iio_dev *indio_dev)
127 struct ade7758_state *st = iio_priv(indio_dev);
130 indio_dev->buffer = iio_kfifo_allocate(indio_dev);
131 if (!indio_dev->buffer) {
136 indio_dev->setup_ops = &ade7758_ring_setup_ops;
138 indio_dev->pollfunc = iio_alloc_pollfunc(&iio_pollfunc_store_time,
139 &ade7758_trigger_handler,
142 "ade7759_consumer%d",
144 if (indio_dev->pollfunc == NULL) {
146 goto error_iio_kfifo_free;
149 indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
151 st->tx_buf[0] = ADE7758_READ_REG(ADE7758_RSTATUS);
155 st->tx_buf[4] = ADE7758_READ_REG(ADE7758_WFORM);
160 /* build spi ring message */
161 st->ring_xfer[0].tx_buf = &st->tx_buf[0];
162 st->ring_xfer[0].len = 1;
163 st->ring_xfer[0].bits_per_word = 8;
164 st->ring_xfer[0].delay_usecs = 4;
165 st->ring_xfer[1].rx_buf = &st->rx_buf[1];
166 st->ring_xfer[1].len = 3;
167 st->ring_xfer[1].bits_per_word = 8;
168 st->ring_xfer[1].cs_change = 1;
170 st->ring_xfer[2].tx_buf = &st->tx_buf[4];
171 st->ring_xfer[2].len = 1;
172 st->ring_xfer[2].bits_per_word = 8;
173 st->ring_xfer[2].delay_usecs = 1;
174 st->ring_xfer[3].rx_buf = &st->rx_buf[5];
175 st->ring_xfer[3].len = 3;
176 st->ring_xfer[3].bits_per_word = 8;
178 spi_message_init(&st->ring_msg);
179 spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
180 spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg);
181 spi_message_add_tail(&st->ring_xfer[2], &st->ring_msg);
182 spi_message_add_tail(&st->ring_xfer[3], &st->ring_msg);
186 error_iio_kfifo_free:
187 iio_kfifo_free(indio_dev->buffer);
191 void ade7758_uninitialize_ring(struct iio_dev *indio_dev)
193 iio_buffer_unregister(indio_dev);