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/interrupt.h>
9 #include <linux/kernel.h>
10 #include <linux/spi/spi.h>
11 #include <linux/slab.h>
12 #include <asm/unaligned.h>
15 #include "../ring_sw.h"
16 #include "../trigger_consumer.h"
20 * ade7758_spi_read_burst() - read data registers
21 * @dev: device associated with child of actual device (iio_dev or iio_trig)
23 static int ade7758_spi_read_burst(struct device
*dev
)
25 struct iio_dev
*indio_dev
= dev_get_drvdata(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 iio_ring_buffer
*ring
= indio_dev
->ring
;
65 struct ade7758_state
*st
= iio_priv(indio_dev
);
67 u32
*dat32
= (u32
*)dat64
;
70 if (ade7758_spi_read_burst(&indio_dev
->dev
) >= 0)
71 *dat32
= get_unaligned_be32(&st
->rx_buf
[5]) & 0xFFFFFF;
73 /* Guaranteed to be aligned with 8 byte boundary */
74 if (ring
->scan_timestamp
)
75 dat64
[1] = pf
->timestamp
;
77 ring
->access
->store_to(ring
, (u8
*)dat64
, pf
->timestamp
);
79 iio_trigger_notify_done(indio_dev
->trig
);
85 * ade7758_ring_preenable() setup the parameters of the ring before enabling
87 * The complex nature of the setting of the nuber of bytes per datum is due
88 * to this driver currently ensuring that the timestamp is stored at an 8
91 static int ade7758_ring_preenable(struct iio_dev
*indio_dev
)
93 struct ade7758_state
*st
= iio_priv(indio_dev
);
94 struct iio_ring_buffer
*ring
= indio_dev
->ring
;
98 if (!ring
->scan_count
)
101 channel
= __ffs(ring
->scan_mask
);
103 d_size
= st
->ade7758_ring_channels
[channel
].scan_type
.storagebits
/ 8;
105 if (ring
->scan_timestamp
) {
106 d_size
+= sizeof(s64
);
108 if (d_size
% sizeof(s64
))
109 d_size
+= sizeof(s64
) - (d_size
% sizeof(s64
));
112 if (indio_dev
->ring
->access
->set_bytes_per_datum
)
113 indio_dev
->ring
->access
->set_bytes_per_datum(indio_dev
->ring
,
116 ade7758_write_waveform_type(&indio_dev
->dev
,
117 st
->ade7758_ring_channels
[channel
].address
);
122 static const struct iio_ring_setup_ops ade7758_ring_setup_ops
= {
123 .preenable
= &ade7758_ring_preenable
,
124 .postenable
= &iio_triggered_ring_postenable
,
125 .predisable
= &iio_triggered_ring_predisable
,
128 void ade7758_unconfigure_ring(struct iio_dev
*indio_dev
)
130 iio_dealloc_pollfunc(indio_dev
->pollfunc
);
131 iio_sw_rb_free(indio_dev
->ring
);
134 int ade7758_configure_ring(struct iio_dev
*indio_dev
)
136 struct ade7758_state
*st
= iio_priv(indio_dev
);
139 indio_dev
->ring
= iio_sw_rb_allocate(indio_dev
);
140 if (!indio_dev
->ring
) {
145 /* Effectively select the ring buffer implementation */
146 indio_dev
->ring
->access
= &ring_sw_access_funcs
;
147 indio_dev
->ring
->setup_ops
= &ade7758_ring_setup_ops
;
148 indio_dev
->ring
->owner
= THIS_MODULE
;
150 indio_dev
->pollfunc
= iio_alloc_pollfunc(&iio_pollfunc_store_time
,
151 &ade7758_trigger_handler
,
154 "ade7759_consumer%d",
156 if (indio_dev
->pollfunc
== NULL
) {
158 goto error_iio_sw_rb_free
;
161 indio_dev
->modes
|= INDIO_RING_TRIGGERED
;
163 st
->tx_buf
[0] = ADE7758_READ_REG(ADE7758_RSTATUS
);
167 st
->tx_buf
[4] = ADE7758_READ_REG(ADE7758_WFORM
);
172 /* build spi ring message */
173 st
->ring_xfer
[0].tx_buf
= &st
->tx_buf
[0];
174 st
->ring_xfer
[0].len
= 1;
175 st
->ring_xfer
[0].bits_per_word
= 8;
176 st
->ring_xfer
[0].delay_usecs
= 4;
177 st
->ring_xfer
[1].rx_buf
= &st
->rx_buf
[1];
178 st
->ring_xfer
[1].len
= 3;
179 st
->ring_xfer
[1].bits_per_word
= 8;
180 st
->ring_xfer
[1].cs_change
= 1;
182 st
->ring_xfer
[2].tx_buf
= &st
->tx_buf
[4];
183 st
->ring_xfer
[2].len
= 1;
184 st
->ring_xfer
[2].bits_per_word
= 8;
185 st
->ring_xfer
[2].delay_usecs
= 1;
186 st
->ring_xfer
[3].rx_buf
= &st
->rx_buf
[5];
187 st
->ring_xfer
[3].len
= 3;
188 st
->ring_xfer
[3].bits_per_word
= 8;
190 spi_message_init(&st
->ring_msg
);
191 spi_message_add_tail(&st
->ring_xfer
[0], &st
->ring_msg
);
192 spi_message_add_tail(&st
->ring_xfer
[1], &st
->ring_msg
);
193 spi_message_add_tail(&st
->ring_xfer
[2], &st
->ring_msg
);
194 spi_message_add_tail(&st
->ring_xfer
[3], &st
->ring_msg
);
198 error_iio_sw_rb_free
:
199 iio_sw_rb_free(indio_dev
->ring
);
203 void ade7758_uninitialize_ring(struct iio_ring_buffer
*ring
)
205 iio_ring_buffer_unregister(ring
);