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139 lines
3.7 KiB
Diff
139 lines
3.7 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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--- a/drivers/staging/iio/adc/ad799x_core.c
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+++ b/drivers/staging/iio/adc/ad799x_core.c
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@@ -179,7 +179,10 @@ 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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- *val = st->int_vref_mv;
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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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@@ -409,7 +412,13 @@ static const struct iio_event_spec ad799
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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_spec = _ev_spec, \
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.num_event_specs = _num_ev_spec, \
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}
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@@ -527,7 +536,6 @@ 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;
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@@ -545,17 +553,21 @@ 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 = devm_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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- return ret;
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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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@@ -568,7 +580,7 @@ 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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@@ -592,9 +604,10 @@ 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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+ regulator_disable(st->reg);
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return ret;
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}
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@@ -609,8 +622,8 @@ 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_disable(st->vref);
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+ regulator_disable(st->reg);
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kfree(st->rx_buf);
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return 0;
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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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@@ -95,7 +95,7 @@ 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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@@ -103,14 +103,6 @@ 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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