Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
Hi,
On 16:07 Wed 01 May , Lars-Peter Clausen wrote:
> On 05/01/2013 12:21 AM, Oskar Andero wrote:
> > This adds support for Microchip's 12 bit AD converters MCP3204 and
> > MCP3208. These chips communicates over SPI and supports single-ended
> > and pseudo-differential configurations.
> >
> > Cc: Jonathan Cameron
> > Cc: Lars-Peter Clausen
> > Signed-off-by: Oskar Andero
>
> Hi,
>
> Looks very good in general. A few minor things, mostly related to the
> regulator
> handling and a couple of nitpicks inline.
Thanks for reviewing! I will prepare version 2 shortly.
> > +
> > + ret = regulator_enable(adc->reg);
> > + if (ret < 0)
> > + goto reg_free;
> > + } else {
> > + adc->ref_mv = pdata->ref_mv;
>
> I'd like to see this fallback path go away. For supplies with a const voltage
> the fixed-voltage-regulator can be used.
>
Ok. I added this since the voltage I use for reference is behind a
level-shifter,
meaning there is actually no regulator on the board providing that exact
voltage level. Not sure what you mean with "the fixed-voltage-regulator", but
maybe that is what I am looking for in my case?
Thanks!
-Oskar
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Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
On 05/01/2013 12:21 AM, Oskar Andero wrote:
> This adds support for Microchip's 12 bit AD converters MCP3204 and
> MCP3208. These chips communicates over SPI and supports single-ended
> and pseudo-differential configurations.
>
> Cc: Jonathan Cameron
> Cc: Lars-Peter Clausen
> Signed-off-by: Oskar Andero
Hi,
Looks very good in general. A few minor things, mostly related to the regulator
handling and a couple of nitpicks inline.
> ---
> drivers/iio/adc/Kconfig | 10 ++
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/mcp320x.c | 261
> ++
> include/linux/platform_data/mcp320x.h | 23 +++
> 4 files changed, 295 insertions(+)
> create mode 100644 drivers/iio/adc/mcp320x.c
> create mode 100644 include/linux/platform_data/mcp320x.h
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index ab0767e6..93129ec 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
[...]
> +
> +static int mcp320x_read_raw(struct iio_dev *iio,
> + struct iio_chan_spec const *channel, int *val,
> + int *val2, long mask)
> +{
> + struct mcp320x *adc = iio_priv(iio);
> + int ret = -EINVAL;
> +
> + mutex_lock(>lock);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
[...]
> + case IIO_CHAN_INFO_SCALE:
> + /* Digital output code = (4096 * Vin) / Vref */
> + if (!IS_ERR_OR_NULL(adc->reg)) {
> + ret = regulator_get_voltage(adc->reg);
> + if (ret < 0)
> + goto out;
> + *val = ret / 1000;
> + } else {
> + *val = adc->ref_mv;
> + }
> + *val2 = 4096 * 1000;
The scale of voltage channels is in mV. So I think the * 1000 should be removed.
> + ret = IIO_VAL_FRACTIONAL;
> + break;
> +
> + default:
> + break;
> + }
> +
> +out:
> + mutex_unlock(>lock);
> +
> + return ret;
> +}
[...]h
> +static int mcp320x_probe(struct spi_device *spi)
> +{
> + struct mcp320x_platform_data *pdata = spi->dev.platform_data;
> + struct iio_dev *iio;
It's not a big deal, but usually we call the iio_dev variabl indio_dev would be
nice for consistency to use this name in your driver as well.
> + struct mcp320x *adc;
> + int ret;
> +
> + if (!pdata) {
> + dev_err(>dev, "No platform data!");
> + return -EINVAL;
> + }
> +
> + iio = iio_device_alloc(sizeof(*adc));
> + if (!iio)
> + return -ENOMEM;
> +
> + adc = iio_priv(iio);
> + adc->spi = spi;
> +
> + iio->dev.parent = >dev;
> + iio->name = spi_get_device_id(spi)->name;
> + iio->modes = INDIO_DIRECT_MODE;
> + iio->info = _info;
> +
> + if (spi_get_device_id(spi)->driver_data == mcp3204) {
> + iio->channels = mcp3204_channels;
> + iio->num_channels = ARRAY_SIZE(mcp3204_channels);
> + } else {
> + iio->channels = mcp3208_channels;
> + iio->num_channels = ARRAY_SIZE(mcp3208_channels);
> + }
Usually we use a lookup table for this. E.g
struct mcp3208_chip_info {
struct iio_chan_spec *channels;
unsigned int num_channels;
};
static const struct mcp3208_chip_info[] = {
[mcp3204] = {
.channels = mcp3204_channels,
.num_channels = ARRAY_SIZE(mcp3204_channels)
},
[mcp3204] = {
...
},
};
indio_dev->channels = mcp3208_chip_info[id].channels;
indio_dev->num_channels = mcp3208_chip_info[id].num_channels;
This keeps things a bit more tidy. Especially if more chip variants are added
later.
> +
> + adc->transfer[0].tx_buf = >tx_buf;
> + adc->transfer[0].len = sizeof(adc->tx_buf);
> + adc->transfer[1].rx_buf = adc->rx_buf;
> + adc->transfer[1].len = sizeof(adc->rx_buf);
> +
> + spi_message_init(>msg);
> + spi_message_add_tail(>transfer[0], >msg);
> + spi_message_add_tail(>transfer[1], >msg);
There is a new helper function which makes this a bit shorter:
spi_message_init_with_transfers(>msg, adc->transfer,
ARRAY_SIZE(adc->transfer));
> +
> + if (pdata->reg) {
> + adc->reg = regulator_get(>dev, pdata->reg);
This not how the regulator API is supposed to be used. The regulator name
should be const. E.g. "vref". Your board code then provides a lookup table map
the regulator to the name in the consumer.
> + if (IS_ERR_OR_NULL(adc->reg))
> + return PTR_ERR(adc->reg);
So what happens in the OR_NULL case? I think it is save to just use
IS_ERR(adc->reg)
> +
> + ret = regulator_enable(adc->reg);
> + if (ret < 0)
> + goto reg_free;
> + } else {
> + adc->ref_mv = pdata->ref_mv;
I'd like to see this fallback path go
Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
On 05/01/2013 12:21 AM, Oskar Andero wrote:
This adds support for Microchip's 12 bit AD converters MCP3204 and
MCP3208. These chips communicates over SPI and supports single-ended
and pseudo-differential configurations.
Cc: Jonathan Cameron ji...@cam.ac.uk
Cc: Lars-Peter Clausen l...@metafoo.de
Signed-off-by: Oskar Andero oskar.and...@gmail.com
Hi,
Looks very good in general. A few minor things, mostly related to the regulator
handling and a couple of nitpicks inline.
---
drivers/iio/adc/Kconfig | 10 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/mcp320x.c | 261
++
include/linux/platform_data/mcp320x.h | 23 +++
4 files changed, 295 insertions(+)
create mode 100644 drivers/iio/adc/mcp320x.c
create mode 100644 include/linux/platform_data/mcp320x.h
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ab0767e6..93129ec 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
[...]
+
+static int mcp320x_read_raw(struct iio_dev *iio,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct mcp320x *adc = iio_priv(iio);
+ int ret = -EINVAL;
+
+ mutex_lock(adc-lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
[...]
+ case IIO_CHAN_INFO_SCALE:
+ /* Digital output code = (4096 * Vin) / Vref */
+ if (!IS_ERR_OR_NULL(adc-reg)) {
+ ret = regulator_get_voltage(adc-reg);
+ if (ret 0)
+ goto out;
+ *val = ret / 1000;
+ } else {
+ *val = adc-ref_mv;
+ }
+ *val2 = 4096 * 1000;
The scale of voltage channels is in mV. So I think the * 1000 should be removed.
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+
+ default:
+ break;
+ }
+
+out:
+ mutex_unlock(adc-lock);
+
+ return ret;
+}
[...]h
+static int mcp320x_probe(struct spi_device *spi)
+{
+ struct mcp320x_platform_data *pdata = spi-dev.platform_data;
+ struct iio_dev *iio;
It's not a big deal, but usually we call the iio_dev variabl indio_dev would be
nice for consistency to use this name in your driver as well.
+ struct mcp320x *adc;
+ int ret;
+
+ if (!pdata) {
+ dev_err(spi-dev, No platform data!);
+ return -EINVAL;
+ }
+
+ iio = iio_device_alloc(sizeof(*adc));
+ if (!iio)
+ return -ENOMEM;
+
+ adc = iio_priv(iio);
+ adc-spi = spi;
+
+ iio-dev.parent = spi-dev;
+ iio-name = spi_get_device_id(spi)-name;
+ iio-modes = INDIO_DIRECT_MODE;
+ iio-info = mcp320x_info;
+
+ if (spi_get_device_id(spi)-driver_data == mcp3204) {
+ iio-channels = mcp3204_channels;
+ iio-num_channels = ARRAY_SIZE(mcp3204_channels);
+ } else {
+ iio-channels = mcp3208_channels;
+ iio-num_channels = ARRAY_SIZE(mcp3208_channels);
+ }
Usually we use a lookup table for this. E.g
struct mcp3208_chip_info {
struct iio_chan_spec *channels;
unsigned int num_channels;
};
static const struct mcp3208_chip_info[] = {
[mcp3204] = {
.channels = mcp3204_channels,
.num_channels = ARRAY_SIZE(mcp3204_channels)
},
[mcp3204] = {
...
},
};
indio_dev-channels = mcp3208_chip_info[id].channels;
indio_dev-num_channels = mcp3208_chip_info[id].num_channels;
This keeps things a bit more tidy. Especially if more chip variants are added
later.
+
+ adc-transfer[0].tx_buf = adc-tx_buf;
+ adc-transfer[0].len = sizeof(adc-tx_buf);
+ adc-transfer[1].rx_buf = adc-rx_buf;
+ adc-transfer[1].len = sizeof(adc-rx_buf);
+
+ spi_message_init(adc-msg);
+ spi_message_add_tail(adc-transfer[0], adc-msg);
+ spi_message_add_tail(adc-transfer[1], adc-msg);
There is a new helper function which makes this a bit shorter:
spi_message_init_with_transfers(adc-msg, adc-transfer,
ARRAY_SIZE(adc-transfer));
+
+ if (pdata-reg) {
+ adc-reg = regulator_get(spi-dev, pdata-reg);
This not how the regulator API is supposed to be used. The regulator name
should be const. E.g. vref. Your board code then provides a lookup table map
the regulator to the name in the consumer.
+ if (IS_ERR_OR_NULL(adc-reg))
+ return PTR_ERR(adc-reg);
So what happens in the OR_NULL case? I think it is save to just use
IS_ERR(adc-reg)
+
+ ret = regulator_enable(adc-reg);
+ if (ret 0)
+ goto reg_free;
+ } else {
+ adc-ref_mv = pdata-ref_mv;
I'd like to see this fallback path go away. For supplies with a const voltage
the
Re: [PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
Hi,
On 16:07 Wed 01 May , Lars-Peter Clausen wrote:
On 05/01/2013 12:21 AM, Oskar Andero wrote:
This adds support for Microchip's 12 bit AD converters MCP3204 and
MCP3208. These chips communicates over SPI and supports single-ended
and pseudo-differential configurations.
Cc: Jonathan Cameron ji...@cam.ac.uk
Cc: Lars-Peter Clausen l...@metafoo.de
Signed-off-by: Oskar Andero oskar.and...@gmail.com
Hi,
Looks very good in general. A few minor things, mostly related to the
regulator
handling and a couple of nitpicks inline.
Thanks for reviewing! I will prepare version 2 shortly.
+
+ ret = regulator_enable(adc-reg);
+ if (ret 0)
+ goto reg_free;
+ } else {
+ adc-ref_mv = pdata-ref_mv;
I'd like to see this fallback path go away. For supplies with a const voltage
the fixed-voltage-regulator can be used.
Ok. I added this since the voltage I use for reference is behind a
level-shifter,
meaning there is actually no regulator on the board providing that exact
voltage level. Not sure what you mean with the fixed-voltage-regulator, but
maybe that is what I am looking for in my case?
Thanks!
-Oskar
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
This adds support for Microchip's 12 bit AD converters MCP3204 and
MCP3208. These chips communicates over SPI and supports single-ended
and pseudo-differential configurations.
Cc: Jonathan Cameron
Cc: Lars-Peter Clausen
Signed-off-by: Oskar Andero
---
drivers/iio/adc/Kconfig | 10 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/mcp320x.c | 261 ++
include/linux/platform_data/mcp320x.h | 23 +++
4 files changed, 295 insertions(+)
create mode 100644 drivers/iio/adc/mcp320x.c
create mode 100644 include/linux/platform_data/mcp320x.h
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ab0767e6..93129ec 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -133,6 +133,16 @@ config MAX1363
max11646, max11647) Provides direct access via sysfs and buffered
data via the iio dev interface.
+config MCP320X
+ tristate "Microchip Technology MCP3204/08"
+ depends on SPI
+ help
+ Say yes here to build support for Microchip Technology's MCP3204 or
+ MCP3208 analog to digital converter.
+
+ This driver can also be built as a module. If so, the module will be
+ called mcp320x.
+
config TI_ADC081C
tristate "Texas Instruments ADC081C021/027"
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 0a825be..8f475d3 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_AT91_ADC) += at91_adc.o
obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
new file mode 100644
index 000..cb308e8
--- /dev/null
+++ b/drivers/iio/adc/mcp320x.c
@@ -0,0 +1,261 @@
+/*
+ * Copyright (C) 2013 Oskar Andero
+ *
+ * Driver for Microchip Technology's MCP3204 and MCP3208 ADC chips.
+ * Datasheet can be found here:
+ * http://ww1.microchip.com/downloads/en/devicedoc/21298c.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+
+#define MCP_SINGLE_ENDED (1 << 3)
+#define MCP_START_BIT (1 << 4)
+
+enum {
+ mcp3204,
+ mcp3208,
+};
+
+struct mcp320x {
+ struct spi_device *spi;
+ struct spi_message msg;
+ struct spi_transfer transfer[2];
+
+ u8 tx_buf;
+ u8 rx_buf[2];
+
+ struct regulator *reg;
+ unsigned int ref_mv;
+
+ struct mutex lock;
+};
+
+static int mcp320x_adc_conversion(struct mcp320x *adc, u8 msg)
+{
+ int ret;
+
+ adc->tx_buf = msg;
+ ret = spi_sync(adc->spi, >msg);
+ if (ret < 0)
+ return ret;
+
+ return ((adc->rx_buf[0] & 0x3f) << 6) |
+ (adc->rx_buf[1] >> 2);
+}
+
+static int mcp320x_read_raw(struct iio_dev *iio,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct mcp320x *adc = iio_priv(iio);
+ int ret = -EINVAL;
+
+ mutex_lock(>lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (channel->differential)
+ ret = mcp320x_adc_conversion(adc,
+ MCP_START_BIT | channel->address);
+ else
+ ret = mcp320x_adc_conversion(adc,
+ MCP_START_BIT | MCP_SINGLE_ENDED |
+ channel->address);
+ if (ret < 0)
+ goto out;
+
+ *val = ret;
+ ret = IIO_VAL_INT;
+ break;
+
+ case IIO_CHAN_INFO_SCALE:
+ /* Digital output code = (4096 * Vin) / Vref */
+ if (!IS_ERR_OR_NULL(adc->reg)) {
+ ret = regulator_get_voltage(adc->reg);
+ if (ret < 0)
+ goto out;
+ *val = ret / 1000;
+ } else {
+ *val = adc->ref_mv;
+ }
+ *val2 = 4096 * 1000;
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+
+ default:
+ break;
+ }
+
+out:
+ mutex_unlock(>lock);
+
+ return ret;
+}
+
+#define MCP320X_VOLTAGE_CHANNEL(num) \
+ { \
+ .type = IIO_VOLTAGE,\
+ .indexed = 1, \
+ .channel =
[PATCH] iio: adc: add driver for MCP3204/08 12-bit ADC
This adds support for Microchip's 12 bit AD converters MCP3204 and
MCP3208. These chips communicates over SPI and supports single-ended
and pseudo-differential configurations.
Cc: Jonathan Cameron ji...@cam.ac.uk
Cc: Lars-Peter Clausen l...@metafoo.de
Signed-off-by: Oskar Andero oskar.and...@gmail.com
---
drivers/iio/adc/Kconfig | 10 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/mcp320x.c | 261 ++
include/linux/platform_data/mcp320x.h | 23 +++
4 files changed, 295 insertions(+)
create mode 100644 drivers/iio/adc/mcp320x.c
create mode 100644 include/linux/platform_data/mcp320x.h
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index ab0767e6..93129ec 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -133,6 +133,16 @@ config MAX1363
max11646, max11647) Provides direct access via sysfs and buffered
data via the iio dev interface.
+config MCP320X
+ tristate Microchip Technology MCP3204/08
+ depends on SPI
+ help
+ Say yes here to build support for Microchip Technology's MCP3204 or
+ MCP3208 analog to digital converter.
+
+ This driver can also be built as a module. If so, the module will be
+ called mcp320x.
+
config TI_ADC081C
tristate Texas Instruments ADC081C021/027
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 0a825be..8f475d3 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_AT91_ADC) += at91_adc.o
obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
diff --git a/drivers/iio/adc/mcp320x.c b/drivers/iio/adc/mcp320x.c
new file mode 100644
index 000..cb308e8
--- /dev/null
+++ b/drivers/iio/adc/mcp320x.c
@@ -0,0 +1,261 @@
+/*
+ * Copyright (C) 2013 Oskar Andero oskar.and...@gmail.com
+ *
+ * Driver for Microchip Technology's MCP3204 and MCP3208 ADC chips.
+ * Datasheet can be found here:
+ * http://ww1.microchip.com/downloads/en/devicedoc/21298c.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include linux/err.h
+#include linux/spi/spi.h
+#include linux/module.h
+#include linux/iio/iio.h
+#include linux/regulator/consumer.h
+#include linux/platform_data/mcp320x.h
+
+#define MCP_SINGLE_ENDED (1 3)
+#define MCP_START_BIT (1 4)
+
+enum {
+ mcp3204,
+ mcp3208,
+};
+
+struct mcp320x {
+ struct spi_device *spi;
+ struct spi_message msg;
+ struct spi_transfer transfer[2];
+
+ u8 tx_buf;
+ u8 rx_buf[2];
+
+ struct regulator *reg;
+ unsigned int ref_mv;
+
+ struct mutex lock;
+};
+
+static int mcp320x_adc_conversion(struct mcp320x *adc, u8 msg)
+{
+ int ret;
+
+ adc-tx_buf = msg;
+ ret = spi_sync(adc-spi, adc-msg);
+ if (ret 0)
+ return ret;
+
+ return ((adc-rx_buf[0] 0x3f) 6) |
+ (adc-rx_buf[1] 2);
+}
+
+static int mcp320x_read_raw(struct iio_dev *iio,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct mcp320x *adc = iio_priv(iio);
+ int ret = -EINVAL;
+
+ mutex_lock(adc-lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (channel-differential)
+ ret = mcp320x_adc_conversion(adc,
+ MCP_START_BIT | channel-address);
+ else
+ ret = mcp320x_adc_conversion(adc,
+ MCP_START_BIT | MCP_SINGLE_ENDED |
+ channel-address);
+ if (ret 0)
+ goto out;
+
+ *val = ret;
+ ret = IIO_VAL_INT;
+ break;
+
+ case IIO_CHAN_INFO_SCALE:
+ /* Digital output code = (4096 * Vin) / Vref */
+ if (!IS_ERR_OR_NULL(adc-reg)) {
+ ret = regulator_get_voltage(adc-reg);
+ if (ret 0)
+ goto out;
+ *val = ret / 1000;
+ } else {
+ *val = adc-ref_mv;
+ }
+ *val2 = 4096 * 1000;
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+
+ default:
+ break;
+ }
+
+out:
+ mutex_unlock(adc-lock);
+
+ return ret;
+}
+
+#define MCP320X_VOLTAGE_CHANNEL(num) \
+ {
