[OpenWrt-Devel] [PATCH] Backport essential fixes for ad799x
Hartmut Knaack
knaack.h at gmx.de
Sun Jun 29 17:22:06 EDT 2014
This series of patches ports back some fixes of the ad799x driver, which were
commited between 3.10 and 3.15.
Signed-off-by: Hartmut Knaack <knaack.h at gmx.de>
---
diff --git a/target/linux/generic/patches-3.10/065-iio_ad799x_backport_fixes.patch b/target/linux/generic/patches-3.10/065-iio_ad799x_backport_fixes.patch
new file mode 100644
index 0000000..4368ec7
--- /dev/null
+++ b/target/linux/generic/patches-3.10/065-iio_ad799x_backport_fixes.patch
@@ -0,0 +1,159 @@
+Backport essential fixes from 3.15
+
+From Linux 3.10 on this driver required platform data to load, which makes it
+unusable in OpenWRT. This commit backports the following fixes:
+ * Move to regulator framework for scaling
+ * Set endianness of the ADC to Big endian
+ * Fix device-removal path
+This commit should not be moved to newer kernel versions!
+
+Signed-off-by: Hartmut Knaack <knaack.h at gmx.de>
+---
+diff -uprN a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
+--- a/drivers/staging/iio/adc/ad799x_core.c
++++ b/drivers/staging/iio/adc/ad799x_core.c
+@@ -163,7 +163,6 @@ static int ad799x_read_raw(struct iio_de
+ {
+ int ret;
+ struct ad799x_state *st = iio_priv(indio_dev);
+- unsigned int scale_uv;
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+@@ -180,10 +179,12 @@ static int ad799x_read_raw(struct iio_de
+ RES_MASK(chan->scan_type.realbits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+- scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
+- *val = scale_uv / 1000;
+- *val2 = (scale_uv % 1000) * 1000;
+- return IIO_VAL_INT_PLUS_MICRO;
++ ret = regulator_get_voltage(st->vref);
++ if (ret < 0)
++ return ret;
++ *val = ret / 1000;
++ *val2 = chan->scan_type.realbits;
++ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+ }
+@@ -474,7 +475,13 @@ static const struct iio_info ad7993_4_7_
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = (_index), \
+- .scan_type = IIO_ST('u', _realbits, 16, 12 - (_realbits)), \
++ .scan_type = { \
++ .sign = 'u', \
++ .realbits = (_realbits), \
++ .storagebits = 16, \
++ .shift = 12 - (_realbits), \
++ .endianness = IIO_BE, \
++ }, \
+ .event_mask = (_evmask), \
+ }
+
+@@ -584,7 +591,6 @@ static int ad799x_probe(struct i2c_clien
+ const struct i2c_device_id *id)
+ {
+ int ret;
+- struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st;
+ struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
+
+@@ -601,17 +607,21 @@ static int ad799x_probe(struct i2c_clien
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+- if (!pdata)
+- return -EINVAL;
+-
+- st->int_vref_mv = pdata->vref_mv;
+-
+- st->reg = regulator_get(&client->dev, "vcc");
+- if (!IS_ERR(st->reg)) {
+- ret = regulator_enable(st->reg);
+- if (ret)
+- goto error_put_reg;
++ st->reg = devm_regulator_get(&client->dev, "vcc");
++ if (IS_ERR(st->reg))
++ return PTR_ERR(st->reg);
++ ret = regulator_enable(st->reg);
++ if (ret)
++ return ret;
++ st->vref = devm_regulator_get(&client->dev, "vref");
++ if (IS_ERR(st->vref)) {
++ ret = PTR_ERR(st->vref);
++ goto error_disable_reg;
+ }
++ ret = regulator_enable(st->vref);
++ if (ret)
++ goto error_disable_reg;
++
+ st->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+@@ -624,7 +634,7 @@ static int ad799x_probe(struct i2c_clien
+
+ ret = ad799x_register_ring_funcs_and_init(indio_dev);
+ if (ret)
+- goto error_disable_reg;
++ goto error_disable_vref;
+
+ if (client->irq > 0) {
+ ret = request_threaded_irq(client->irq,
+@@ -648,12 +658,10 @@ error_free_irq:
+ free_irq(client->irq, indio_dev);
+ error_cleanup_ring:
+ ad799x_ring_cleanup(indio_dev);
++error_disable_vref:
++ regulator_disable(st->vref);
+ error_disable_reg:
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
+-error_put_reg:
+- if (!IS_ERR(st->reg))
+- regulator_put(st->reg);
++ regulator_disable(st->reg);
+ iio_device_free(indio_dev);
+
+ return ret;
+@@ -669,10 +677,8 @@ static int ad799x_remove(struct i2c_clie
+ free_irq(client->irq, indio_dev);
+
+ ad799x_ring_cleanup(indio_dev);
+- if (!IS_ERR(st->reg)) {
+- regulator_disable(st->reg);
+- regulator_put(st->reg);
+- }
++ regulator_disable(st->vref);
++ regulator_disable(st->reg);
+ kfree(st->rx_buf);
+ iio_device_free(indio_dev);
+
+diff -uprN a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
+--- a/drivers/staging/iio/adc/ad799x.h
++++ b/drivers/staging/iio/adc/ad799x.h
+@@ -103,7 +103,7 @@ struct ad799x_state {
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct regulator *reg;
+- u16 int_vref_mv;
++ struct regulator *vref;
+ unsigned id;
+ u16 config;
+
+@@ -111,14 +111,6 @@ struct ad799x_state {
+ unsigned int transfer_size;
+ };
+
+-/*
+- * TODO: struct ad799x_platform_data needs to go into include/linux/iio
+- */
+-
+-struct ad799x_platform_data {
+- u16 vref_mv;
+-};
+-
+ #ifdef CONFIG_AD799X_RING_BUFFER
+ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+ void ad799x_ring_cleanup(struct iio_dev *indio_dev);
diff --git a/target/linux/generic/patches-3.12/065-iio_ad799x_backport_fixes.patch b/target/linux/generic/patches-3.12/065-iio_ad799x_backport_fixes.patch
new file mode 100644
index 0000000..4368ec7
--- /dev/null
+++ b/target/linux/generic/patches-3.12/065-iio_ad799x_backport_fixes.patch
@@ -0,0 +1,159 @@
+Backport essential fixes from 3.15
+
+From Linux 3.10 on this driver required platform data to load, which makes it
+unusable in OpenWRT. This commit backports the following fixes:
+ * Move to regulator framework for scaling
+ * Set endianness of the ADC to Big endian
+ * Fix device-removal path
+This commit should not be moved to newer kernel versions!
+
+Signed-off-by: Hartmut Knaack <knaack.h at gmx.de>
+---
+diff -uprN a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
+--- a/drivers/staging/iio/adc/ad799x_core.c
++++ b/drivers/staging/iio/adc/ad799x_core.c
+@@ -163,7 +163,6 @@ static int ad799x_read_raw(struct iio_de
+ {
+ int ret;
+ struct ad799x_state *st = iio_priv(indio_dev);
+- unsigned int scale_uv;
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+@@ -180,10 +179,12 @@ static int ad799x_read_raw(struct iio_de
+ RES_MASK(chan->scan_type.realbits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+- scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
+- *val = scale_uv / 1000;
+- *val2 = (scale_uv % 1000) * 1000;
+- return IIO_VAL_INT_PLUS_MICRO;
++ ret = regulator_get_voltage(st->vref);
++ if (ret < 0)
++ return ret;
++ *val = ret / 1000;
++ *val2 = chan->scan_type.realbits;
++ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+ }
+@@ -474,7 +475,13 @@ static const struct iio_info ad7993_4_7_
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = (_index), \
+- .scan_type = IIO_ST('u', _realbits, 16, 12 - (_realbits)), \
++ .scan_type = { \
++ .sign = 'u', \
++ .realbits = (_realbits), \
++ .storagebits = 16, \
++ .shift = 12 - (_realbits), \
++ .endianness = IIO_BE, \
++ }, \
+ .event_mask = (_evmask), \
+ }
+
+@@ -584,7 +591,6 @@ static int ad799x_probe(struct i2c_clien
+ const struct i2c_device_id *id)
+ {
+ int ret;
+- struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st;
+ struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
+
+@@ -601,17 +607,21 @@ static int ad799x_probe(struct i2c_clien
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+- if (!pdata)
+- return -EINVAL;
+-
+- st->int_vref_mv = pdata->vref_mv;
+-
+- st->reg = regulator_get(&client->dev, "vcc");
+- if (!IS_ERR(st->reg)) {
+- ret = regulator_enable(st->reg);
+- if (ret)
+- goto error_put_reg;
++ st->reg = devm_regulator_get(&client->dev, "vcc");
++ if (IS_ERR(st->reg))
++ return PTR_ERR(st->reg);
++ ret = regulator_enable(st->reg);
++ if (ret)
++ return ret;
++ st->vref = devm_regulator_get(&client->dev, "vref");
++ if (IS_ERR(st->vref)) {
++ ret = PTR_ERR(st->vref);
++ goto error_disable_reg;
+ }
++ ret = regulator_enable(st->vref);
++ if (ret)
++ goto error_disable_reg;
++
+ st->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+@@ -624,7 +634,7 @@ static int ad799x_probe(struct i2c_clien
+
+ ret = ad799x_register_ring_funcs_and_init(indio_dev);
+ if (ret)
+- goto error_disable_reg;
++ goto error_disable_vref;
+
+ if (client->irq > 0) {
+ ret = request_threaded_irq(client->irq,
+@@ -648,12 +658,10 @@ error_free_irq:
+ free_irq(client->irq, indio_dev);
+ error_cleanup_ring:
+ ad799x_ring_cleanup(indio_dev);
++error_disable_vref:
++ regulator_disable(st->vref);
+ error_disable_reg:
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
+-error_put_reg:
+- if (!IS_ERR(st->reg))
+- regulator_put(st->reg);
++ regulator_disable(st->reg);
+ iio_device_free(indio_dev);
+
+ return ret;
+@@ -669,10 +677,8 @@ static int ad799x_remove(struct i2c_clie
+ free_irq(client->irq, indio_dev);
+
+ ad799x_ring_cleanup(indio_dev);
+- if (!IS_ERR(st->reg)) {
+- regulator_disable(st->reg);
+- regulator_put(st->reg);
+- }
++ regulator_disable(st->vref);
++ regulator_disable(st->reg);
+ kfree(st->rx_buf);
+ iio_device_free(indio_dev);
+
+diff -uprN a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
+--- a/drivers/staging/iio/adc/ad799x.h
++++ b/drivers/staging/iio/adc/ad799x.h
+@@ -103,7 +103,7 @@ struct ad799x_state {
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct regulator *reg;
+- u16 int_vref_mv;
++ struct regulator *vref;
+ unsigned id;
+ u16 config;
+
+@@ -111,14 +111,6 @@ struct ad799x_state {
+ unsigned int transfer_size;
+ };
+
+-/*
+- * TODO: struct ad799x_platform_data needs to go into include/linux/iio
+- */
+-
+-struct ad799x_platform_data {
+- u16 vref_mv;
+-};
+-
+ #ifdef CONFIG_AD799X_RING_BUFFER
+ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+ void ad799x_ring_cleanup(struct iio_dev *indio_dev);
diff --git a/target/linux/generic/patches-3.13/065-iio_ad799x_backport_fixes.patch b/target/linux/generic/patches-3.13/065-iio_ad799x_backport_fixes.patch
new file mode 100644
index 0000000..cc7b8c2
--- /dev/null
+++ b/target/linux/generic/patches-3.13/065-iio_ad799x_backport_fixes.patch
@@ -0,0 +1,140 @@
+Backport essential fixes from 3.15
+
+From Linux 3.10 on this driver required platform data to load, which makes it
+unusable in OpenWRT. This commit backports the following fixes:
+ * Move to regulator framework for scaling
+ * Set endianness of the ADC to Big endian
+ * Fix device-removal path
+This commit should not be moved to newer kernel versions!
+
+Signed-off-by: Hartmut Knaack <knaack.h at gmx.de>
+---
+diff -uprN a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
+--- a/drivers/staging/iio/adc/ad799x_core.c
++++ b/drivers/staging/iio/adc/ad799x_core.c
+@@ -179,7 +179,10 @@ static int ad799x_read_raw(struct iio_de
+ RES_MASK(chan->scan_type.realbits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+- *val = st->int_vref_mv;
++ ret = regulator_get_voltage(st->vref);
++ if (ret < 0)
++ return ret;
++ *val = ret / 1000;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+@@ -409,7 +412,13 @@ static const struct iio_event_spec ad799
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = (_index), \
+- .scan_type = IIO_ST('u', _realbits, 16, 12 - (_realbits)), \
++ .scan_type = { \
++ .sign = 'u', \
++ .realbits = (_realbits), \
++ .storagebits = 16, \
++ .shift = 12 - (_realbits), \
++ .endianness = IIO_BE, \
++ }, \
+ .event_spec = _ev_spec, \
+ .num_event_specs = _num_ev_spec, \
+ }
+@@ -527,7 +536,6 @@ static int ad799x_probe(struct i2c_clien
+ const struct i2c_device_id *id)
+ {
+ int ret;
+- struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st;
+ struct iio_dev *indio_dev;
+
+@@ -545,17 +553,21 @@ static int ad799x_probe(struct i2c_clien
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+- if (!pdata)
+- return -EINVAL;
+-
+- st->int_vref_mv = pdata->vref_mv;
+-
+ st->reg = devm_regulator_get(&client->dev, "vcc");
+- if (!IS_ERR(st->reg)) {
+- ret = regulator_enable(st->reg);
+- if (ret)
+- return ret;
++ if (IS_ERR(st->reg))
++ return PTR_ERR(st->reg);
++ ret = regulator_enable(st->reg);
++ if (ret)
++ return ret;
++ st->vref = devm_regulator_get(&client->dev, "vref");
++ if (IS_ERR(st->vref)) {
++ ret = PTR_ERR(st->vref);
++ goto error_disable_reg;
+ }
++ ret = regulator_enable(st->vref);
++ if (ret)
++ goto error_disable_reg;
++
+ st->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+@@ -568,7 +580,7 @@ static int ad799x_probe(struct i2c_clien
+
+ ret = ad799x_register_ring_funcs_and_init(indio_dev);
+ if (ret)
+- goto error_disable_reg;
++ goto error_disable_vref;
+
+ if (client->irq > 0) {
+ ret = request_threaded_irq(client->irq,
+@@ -592,9 +604,10 @@ error_free_irq:
+ free_irq(client->irq, indio_dev);
+ error_cleanup_ring:
+ ad799x_ring_cleanup(indio_dev);
++error_disable_vref:
++ regulator_disable(st->vref);
+ error_disable_reg:
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
++ regulator_disable(st->reg);
+
+ return ret;
+ }
+@@ -609,8 +622,8 @@ static int ad799x_remove(struct i2c_clie
+ free_irq(client->irq, indio_dev);
+
+ ad799x_ring_cleanup(indio_dev);
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
++ regulator_disable(st->vref);
++ regulator_disable(st->reg);
+ kfree(st->rx_buf);
+
+ return 0;
+diff -uprN a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
+--- a/drivers/staging/iio/adc/ad799x.h
++++ b/drivers/staging/iio/adc/ad799x.h
+@@ -95,7 +95,7 @@ struct ad799x_state {
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct regulator *reg;
+- u16 int_vref_mv;
++ struct regulator *vref;
+ unsigned id;
+ u16 config;
+
+@@ -103,14 +103,6 @@ struct ad799x_state {
+ unsigned int transfer_size;
+ };
+
+-/*
+- * TODO: struct ad799x_platform_data needs to go into include/linux/iio
+- */
+-
+-struct ad799x_platform_data {
+- u16 vref_mv;
+-};
+-
+ #ifdef CONFIG_AD799X_RING_BUFFER
+ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+ void ad799x_ring_cleanup(struct iio_dev *indio_dev);
diff --git a/target/linux/generic/patches-3.14/065-iio_ad799x_backport_fixes.patch b/target/linux/generic/patches-3.14/065-iio_ad799x_backport_fixes.patch
new file mode 100644
index 0000000..f99c8d7
--- /dev/null
+++ b/target/linux/generic/patches-3.14/065-iio_ad799x_backport_fixes.patch
@@ -0,0 +1,124 @@
+Backport essential fixes from 3.15
+
+From Linux 3.10 on this driver required platform data to load, which makes it
+unusable in OpenWRT. This commit backports the following fixes:
+ * Move to regulator framework for scaling
+ * Fix device-removal path
+This commit should not be moved to newer kernel versions!
+
+Signed-off-by: Hartmut Knaack <knaack.h at gmx.de>
+---
+diff -uprN a/drivers/staging/iio/adc/ad799x_core.c b/drivers/staging/iio/adc/ad799x_core.c
+--- a/drivers/staging/iio/adc/ad799x_core.c 2014-06-11 21:02:49.000000000 +0200
++++ b/drivers/staging/iio/adc/ad799x_core.c 2014-06-19 09:50:28.000000000 +0200
+@@ -179,7 +179,10 @@ static int ad799x_read_raw(struct iio_de
+ RES_MASK(chan->scan_type.realbits);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+- *val = st->int_vref_mv;
++ ret = regulator_get_voltage(st->vref);
++ if (ret < 0)
++ return ret;
++ *val = ret / 1000;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+@@ -533,7 +536,6 @@ static int ad799x_probe(struct i2c_clien
+ const struct i2c_device_id *id)
+ {
+ int ret;
+- struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st;
+ struct iio_dev *indio_dev;
+
+@@ -551,17 +553,21 @@ static int ad799x_probe(struct i2c_clien
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+- if (!pdata)
+- return -EINVAL;
+-
+- st->int_vref_mv = pdata->vref_mv;
+-
+ st->reg = devm_regulator_get(&client->dev, "vcc");
+- if (!IS_ERR(st->reg)) {
+- ret = regulator_enable(st->reg);
+- if (ret)
+- return ret;
++ if (IS_ERR(st->reg))
++ return PTR_ERR(st->reg);
++ ret = regulator_enable(st->reg);
++ if (ret)
++ return ret;
++ st->vref = devm_regulator_get(&client->dev, "vref");
++ if (IS_ERR(st->vref)) {
++ ret = PTR_ERR(st->vref);
++ goto error_disable_reg;
+ }
++ ret = regulator_enable(st->vref);
++ if (ret)
++ goto error_disable_reg;
++
+ st->client = client;
+
+ indio_dev->dev.parent = &client->dev;
+@@ -574,7 +580,7 @@ static int ad799x_probe(struct i2c_clien
+
+ ret = ad799x_register_ring_funcs_and_init(indio_dev);
+ if (ret)
+- goto error_disable_reg;
++ goto error_disable_vref;
+
+ if (client->irq > 0) {
+ ret = request_threaded_irq(client->irq,
+@@ -598,9 +604,10 @@ error_free_irq:
+ free_irq(client->irq, indio_dev);
+ error_cleanup_ring:
+ ad799x_ring_cleanup(indio_dev);
++error_disable_vref:
++ regulator_disable(st->vref);
+ error_disable_reg:
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
++ regulator_disable(st->reg);
+
+ return ret;
+ }
+@@ -615,8 +622,8 @@ static int ad799x_remove(struct i2c_clie
+ free_irq(client->irq, indio_dev);
+
+ ad799x_ring_cleanup(indio_dev);
+- if (!IS_ERR(st->reg))
+- regulator_disable(st->reg);
++ regulator_disable(st->vref);
++ regulator_disable(st->reg);
+ kfree(st->rx_buf);
+
+ return 0;
+diff -uprN a/drivers/staging/iio/adc/ad799x.h b/drivers/staging/iio/adc/ad799x.h
+--- a/drivers/staging/iio/adc/ad799x.h 2014-06-11 21:02:49.000000000 +0200
++++ b/drivers/staging/iio/adc/ad799x.h 2014-06-19 09:51:15.000000000 +0200
+@@ -95,7 +95,7 @@ struct ad799x_state {
+ struct i2c_client *client;
+ const struct ad799x_chip_info *chip_info;
+ struct regulator *reg;
+- u16 int_vref_mv;
++ struct regulator *vref;
+ unsigned id;
+ u16 config;
+
+@@ -103,14 +103,6 @@ struct ad799x_state {
+ unsigned int transfer_size;
+ };
+
+-/*
+- * TODO: struct ad799x_platform_data needs to go into include/linux/iio
+- */
+-
+-struct ad799x_platform_data {
+- u16 vref_mv;
+-};
+-
+ #ifdef CONFIG_AD799X_RING_BUFFER
+ int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
+ void ad799x_ring_cleanup(struct iio_dev *indio_dev);
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