160 lines
4.5 KiB
Diff
160 lines
4.5 KiB
Diff
Backport essential fixes from 3.15
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From Linux 3.10 on this driver required platform data to load, which makes it
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unusable in OpenWRT. This commit backports the following fixes:
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* Move to regulator framework for scaling
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* Set endianness of the ADC to Big endian
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* Fix device-removal path
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This commit should not be moved to newer kernel versions!
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Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
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---
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diff -uprN a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
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--- a/drivers/staging/iio/adc/ad799x_core.c
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+++ b/drivers/staging/iio/adc/ad799x_core.c
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@@ -163,7 +163,6 @@ static int ad799x_read_raw(struct iio_de
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{
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int ret;
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struct ad799x_state *st = iio_priv(indio_dev);
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- unsigned int scale_uv;
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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@@ -180,10 +179,12 @@ static int ad799x_read_raw(struct iio_de
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RES_MASK(chan->scan_type.realbits);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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- scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
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- *val = scale_uv / 1000;
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- *val2 = (scale_uv % 1000) * 1000;
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- return IIO_VAL_INT_PLUS_MICRO;
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+ ret = regulator_get_voltage(st->vref);
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+ if (ret < 0)
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+ return ret;
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+ *val = ret / 1000;
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+ *val2 = chan->scan_type.realbits;
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+ return IIO_VAL_FRACTIONAL_LOG2;
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}
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return -EINVAL;
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}
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@@ -474,7 +475,13 @@ static const struct iio_info ad7993_4_7_
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = (_index), \
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- .scan_type = IIO_ST('u', _realbits, 16, 12 - (_realbits)), \
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+ .scan_type = { \
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+ .sign = 'u', \
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+ .realbits = (_realbits), \
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+ .storagebits = 16, \
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+ .shift = 12 - (_realbits), \
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+ .endianness = IIO_BE, \
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+ }, \
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.event_mask = (_evmask), \
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}
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@@ -584,7 +591,6 @@ static int ad799x_probe(struct i2c_clien
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const struct i2c_device_id *id)
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{
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int ret;
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- struct ad799x_platform_data *pdata = client->dev.platform_data;
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struct ad799x_state *st;
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struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
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@@ -601,17 +607,21 @@ static int ad799x_probe(struct i2c_clien
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/* TODO: Add pdata options for filtering and bit delay */
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- if (!pdata)
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- return -EINVAL;
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-
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- st->int_vref_mv = pdata->vref_mv;
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-
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- st->reg = regulator_get(&client->dev, "vcc");
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- if (!IS_ERR(st->reg)) {
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- ret = regulator_enable(st->reg);
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- if (ret)
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- goto error_put_reg;
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+ st->reg = devm_regulator_get(&client->dev, "vcc");
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+ if (IS_ERR(st->reg))
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+ return PTR_ERR(st->reg);
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+ ret = regulator_enable(st->reg);
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+ if (ret)
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+ return ret;
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+ st->vref = devm_regulator_get(&client->dev, "vref");
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+ if (IS_ERR(st->vref)) {
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+ ret = PTR_ERR(st->vref);
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+ goto error_disable_reg;
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}
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+ ret = regulator_enable(st->vref);
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+ if (ret)
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+ goto error_disable_reg;
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+
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st->client = client;
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indio_dev->dev.parent = &client->dev;
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@@ -624,7 +634,7 @@ static int ad799x_probe(struct i2c_clien
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ret = ad799x_register_ring_funcs_and_init(indio_dev);
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if (ret)
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- goto error_disable_reg;
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+ goto error_disable_vref;
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if (client->irq > 0) {
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ret = request_threaded_irq(client->irq,
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@@ -648,12 +658,10 @@ error_free_irq:
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free_irq(client->irq, indio_dev);
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error_cleanup_ring:
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ad799x_ring_cleanup(indio_dev);
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+error_disable_vref:
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+ regulator_disable(st->vref);
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error_disable_reg:
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- if (!IS_ERR(st->reg))
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- regulator_disable(st->reg);
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-error_put_reg:
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- if (!IS_ERR(st->reg))
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- regulator_put(st->reg);
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+ regulator_disable(st->reg);
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iio_device_free(indio_dev);
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return ret;
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@@ -669,10 +677,8 @@ static int ad799x_remove(struct i2c_clie
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free_irq(client->irq, indio_dev);
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ad799x_ring_cleanup(indio_dev);
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- if (!IS_ERR(st->reg)) {
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- regulator_disable(st->reg);
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- regulator_put(st->reg);
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- }
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+ regulator_disable(st->vref);
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+ regulator_disable(st->reg);
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kfree(st->rx_buf);
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iio_device_free(indio_dev);
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diff -uprN a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
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--- a/drivers/staging/iio/adc/ad799x.h
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+++ b/drivers/staging/iio/adc/ad799x.h
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@@ -103,7 +103,7 @@ struct ad799x_state {
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struct i2c_client *client;
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const struct ad799x_chip_info *chip_info;
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struct regulator *reg;
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- u16 int_vref_mv;
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+ struct regulator *vref;
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unsigned id;
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u16 config;
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@@ -111,14 +111,6 @@ struct ad799x_state {
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unsigned int transfer_size;
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};
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-/*
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- * TODO: struct ad799x_platform_data needs to go into include/linux/iio
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- */
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-
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-struct ad799x_platform_data {
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- u16 vref_mv;
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-};
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-
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#ifdef CONFIG_AD799X_RING_BUFFER
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int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
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void ad799x_ring_cleanup(struct iio_dev *indio_dev);
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