On 02/24/2016 01:27 PM, Crt Mori wrote:
Hi, Ideally this could be a regmap driver and it would avoid you a lot of endianness, caching, etc. problems. Some other bits below.
Thanks for reviewing. The register layout is not uniform between the SPI and I2C version. Therefore regmap is not an option.
BR Crt On 24 February 2016 at 12:36, <michael.hennerich@xxxxxxxxxx> wrote:From: Paul Cercueil <paul.cercueil@xxxxxxxxxx> This patch adds support for the AD5592R (spi) and AD5593R (i2c) ADC/DAC devices. Signed-off-by: Paul Cercueil <paul.cercueil@xxxxxxxxxx> --- .../devicetree/bindings/iio/dac/ad5592r.txt | 88 +++ drivers/iio/dac/Kconfig | 27 + drivers/iio/dac/Makefile | 3 + drivers/iio/dac/ad5592r-base.c | 670 +++++++++++++++++++++ drivers/iio/dac/ad5592r-base.h | 77 +++ drivers/iio/dac/ad5592r.c | 163 +++++ drivers/iio/dac/ad5593r.c | 136 +++++ include/dt-bindings/iio/adi,ad5592r.h | 16 + 8 files changed, 1180 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/ad5592r.txt create mode 100644 drivers/iio/dac/ad5592r-base.c create mode 100644 drivers/iio/dac/ad5592r-base.h create mode 100644 drivers/iio/dac/ad5592r.c create mode 100644 drivers/iio/dac/ad5593r.c create mode 100644 include/dt-bindings/iio/adi,ad5592r.h diff --git a/Documentation/devicetree/bindings/iio/dac/ad5592r.txt b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt new file mode 100644 index 0000000..9d7f23a --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt @@ -0,0 +1,88 @@ +Analog Devices AD5592R/AD5593R DAC/ADC device driver + +Required properties for the AD5592R: + - compatible: Must be "adi,ad5592r" + - reg: SPI chip select number for the device + - spi-max-frequency: Max SPI frequency to use (< 30000000) + - spi-cpol: The AD5592R requires inverse clock polarity (CPOL) mode + +Required properties for the AD5593R: + - compatible: Must be "adi,ad5593r" + - reg: I2C address of the device + +Required properties for all supported chips: + - channel-modes: An array of eight 8-bit values (one per channel) + describing the mode of each channel. Macros specifying the valid values + can be found in <dt-bindings/iio/adi,ad5592r.h>. + The following values are currently supported: + * CH_MODE_ADC (the pin is ADC input) + * CH_MODE_DAC (the pin is DAC output) + * CH_MODE_DAC_AND_ADC (the pin is DAC output but can be + monitored by an ADC) + * CH_MODE_UNUSED_PULL_DOWN (the pin is pulled down) + * CH_MODE_UNUSED_OUT_LOW (the pin is output low) + * CH_MODE_UNUSED_OUT_HIGH (the pin is output high) + * CH_MODE_UNUSED_OUT_TRISTATE (the pin is tristated output) + * CH_MODE_GPIO (the pin is registered with GPIOLIB) + * CH_MODE_GPIO_OPEN_DRAIN (the pin is configured open drain and + registered with GPIOLIB) + +Optional properties: + - vref-supply: Phandle to the external reference voltage supply. This should + only be set if there is an external reference voltage connected to the VREF + pin. If the property is not set the internal 2.5V reference is used. + - reset-gpios : GPIO spec for the RESET pin. If specified, it will be + asserted during driver probe. + +AD5592R Example: + + #include <dt-bindings/iio/adi,ad5592r.h> + + vref: regulator-vref { + compatible = "regulator-fixed"; + regulator-name = "vref-ad559x"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + regulator-always-on; + }; + + ad5592r@0 { + compatible = "adi,ad5592r"; + reg = <0>; + spi-max-frequency = <1000000>; + spi-cpol; + + channel-modes = /bits/ 8 < + CH_MODE_DAC + CH_MODE_ADC + CH_MODE_DAC_AND_ADC + CH_MODE_DAC_AND_ADC + CH_MODE_UNUSED_PULL_DOWN + CH_MODE_GPIO + CH_MODE_GPIO + CH_MODE_GPIO + >; + + vref-supply = <&vref>; /* optional */ + reset-gpios = <&gpio0 86 0>; /* optional */ + }; + +AD5593R Example: + + #include <dt-bindings/iio/adi,ad5592r.h> + + ad5593r@10 { + compatible = "adi,ad5593r"; + reg = <0x10>; + channel-modes = /bits/ 8 < + CH_MODE_DAC + CH_MODE_ADC + CH_MODE_DAC_AND_ADC + CH_MODE_DAC_AND_ADC + CH_MODE_UNUSED_PULL_DOWN + CH_MODE_GPIO + CH_MODE_GPIO + CH_MODE_GPIO + >; + + }; diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index 31a1985..e7dd376 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -74,6 +74,33 @@ config AD5449 To compile this driver as a module, choose M here: the module will be called ad5449. +config AD5592R_BASE + tristate + +config AD5592R + tristate "Analog Devices AD5592R ADC/DAC driver" + depends on SPI_MASTER + depends on OF + select AD5592R_BASE + help + Say yes here to build support for Analog Devices AD5592R + Digital to Analog / Analog to Digital Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5592r. + +config AD5593R + tristate "Analog Devices AD5593R ADC/DAC driver" + depends on I2C + depends on OF + select AD5592R_BASE + help + Say yes here to build support for Analog Devices AD5593R + Digital to Analog / Analog to Digital Converter. + + To compile this driver as a module, choose M here: the + module will be called ad5593r. + config AD5504 tristate "Analog Devices AD5504/AD5501 DAC SPI driver" depends on SPI diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index e2deda9..cf23310 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -11,6 +11,9 @@ obj-$(CONFIG_AD5064) += ad5064.o obj-$(CONFIG_AD5504) += ad5504.o obj-$(CONFIG_AD5446) += ad5446.o obj-$(CONFIG_AD5449) += ad5449.o +obj-$(CONFIG_AD5592R_BASE) += ad5592r-base.o +obj-$(CONFIG_AD5592R) += ad5592r.o +obj-$(CONFIG_AD5593R) += ad5593r.o obj-$(CONFIG_AD5755) += ad5755.o obj-$(CONFIG_AD5761) += ad5761.o obj-$(CONFIG_AD5764) += ad5764.o diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c new file mode 100644 index 0000000..7438636 --- /dev/null +++ b/drivers/iio/dac/ad5592r-base.c @@ -0,0 +1,670 @@ +/* + * AD5592R Digital <-> Analog converters driver + * + * Copyright 2014-2016 Analog Devices Inc. + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx> + * + * Licensed under the GPL-2. + */ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/regulator/consumer.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> +#include <linux/gpio.h> + +#include <dt-bindings/iio/adi,ad5592r.h> + +#include "ad5592r-base.h" + +#ifdef CONFIG_GPIOLIB + +static int ad5592r_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct ad5592r_state *st = gpiochip_get_data(chip); + int ret = 0; + u8 val; + + mutex_lock(&st->gpio_lock); + + if (st->gpio_out & BIT(offset)) + val = st->gpio_val; + else + ret = st->ops->gpio_read(st, &val); + + mutex_unlock(&st->gpio_lock); + + if (ret < 0) + return ret; + + return !!(val & BIT(offset)); +} + +static void ad5592r_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct ad5592r_state *st = gpiochip_get_data(chip); + + mutex_lock(&st->gpio_lock); + + if (value) + st->gpio_val |= BIT(offset); + else + st->gpio_val &= ~BIT(offset); + + st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val); + + mutex_unlock(&st->gpio_lock); +} + +static int ad5592r_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct ad5592r_state *st = gpiochip_get_data(chip); + int ret; + + mutex_lock(&st->gpio_lock); + + st->gpio_out &= ~BIT(offset); + st->gpio_in |= BIT(offset); + + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out); + if (ret < 0) + goto err_unlock; + + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in); + +err_unlock: + mutex_unlock(&st->gpio_lock); + + return ret; +} + +static int ad5592r_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + struct ad5592r_state *st = gpiochip_get_data(chip); + int ret; + + mutex_lock(&st->gpio_lock); + + if (value) + st->gpio_val |= BIT(offset); + else + st->gpio_val &= ~BIT(offset); + + st->gpio_in &= ~BIT(offset); + st->gpio_out |= BIT(offset); + + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val); + if (ret < 0) + goto err_unlock; + + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out); + if (ret < 0) + goto err_unlock; + + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in); + +err_unlock: + mutex_unlock(&st->gpio_lock); + + return ret; +} + +static int ad5592r_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + struct ad5592r_state *st = gpiochip_get_data(chip); + + if (!(st->gpio_map & BIT(offset))) { + dev_err(st->dev, "GPIO %d is reserved by alternate function\n", + offset); + return -ENODEV; + } + + if (offset >= chip->ngpio) + return -EINVAL; + + return 0; +} + +static int ad5592r_gpio_init(struct ad5592r_state *st) +{ + st->gpiochip.label = dev_name(st->dev); + st->gpiochip.base = -1; + st->gpiochip.ngpio = 8; + st->gpiochip.parent = st->dev; + st->gpiochip.can_sleep = true; + st->gpiochip.direction_input = ad5592r_gpio_direction_input; + st->gpiochip.direction_output = ad5592r_gpio_direction_output; + st->gpiochip.get = ad5592r_gpio_get; + st->gpiochip.set = ad5592r_gpio_set; + st->gpiochip.request = ad5592r_gpio_request; + st->gpiochip.owner = THIS_MODULE; + + mutex_init(&st->gpio_lock); + + return gpiochip_add_data(&st->gpiochip, st); +} + +static void ad5592r_gpio_cleanup(struct ad5592r_state *st) +{ + gpiochip_remove(&st->gpiochip); +} +#else +static int ad5592r_gpio_init(struct ad5592r_state *st) { return 0 }; +static void ad5592r_gpio_cleanup(struct ad5592r_state *st) { }; +#endif /* CONFIG_GPIOLIB */ + +static int ad5592r_reset(struct ad5592r_state *st) +{ + struct gpio_desc *gpio; + struct iio_dev *iio_dev = iio_priv_to_dev(st); + + gpio = devm_gpiod_get_optional(st->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(gpio)) + return PTR_ERR(gpio); + + if (gpio) { + udelay(1); + gpiod_set_value(gpio, 1); + } else { + mutex_lock(&iio_dev->mlock); + st->ops->reg_write(st, AD5592R_REG_RESET, 0xdac); + mutex_unlock(&iio_dev->mlock); + } + + udelay(250); + + return 0; +} + +static int ad5592r_get_vref(struct ad5592r_state *st) +{ + int ret; + + if (st->reg) { + ret = regulator_get_voltage(st->reg); + if (ret < 0) + return ret; + + return ret / 1000; + } else { + return 2500; + } +} + +static int ad5592r_set_channel_modes(struct ad5592r_state *st) +{ + const struct ad5592r_rw_ops *ops = st->ops; + int ret; + unsigned i; + struct iio_dev *iio_dev = iio_priv_to_dev(st); + u8 pulldown = 0, open_drain = 0, tristate = 0, + dac = 0, adc = 0; + u16 read_back; + + for (i = 0; i < st->num_channels; i++) { + switch (st->channel_modes[i]) { + case CH_MODE_DAC: + dac |= BIT(i); + break; + + case CH_MODE_ADC: + adc |= BIT(i); + break; + + case CH_MODE_DAC_AND_ADC: + dac |= BIT(i); + adc |= BIT(i); + break; + + case CH_MODE_UNUSED_PULL_DOWN: + pulldown |= BIT(i); + break; + + case CH_MODE_UNUSED_OUT_TRISTATE: + tristate |= BIT(i); + break; + + case CH_MODE_UNUSED_OUT_LOW: + st->gpio_out |= BIT(i); + break; + + case CH_MODE_UNUSED_OUT_HIGH: + st->gpio_out |= BIT(i); + st->gpio_val |= BIT(i); + break; + + case CH_MODE_GPIO_OPEN_DRAIN: + open_drain |= BIT(i); + + /* fall-through */ + + case CH_MODE_GPIO: + st->gpio_map |= BIT(i); + st->gpio_in |= BIT(i); /* Default to input */ + break; + + default: + pulldown |= BIT(i); + break; + } + } + + mutex_lock(&iio_dev->mlock); + + /* Pull down unused pins to GND */ + ret = ops->reg_write(st, AD5592R_REG_PULLDOWN, pulldown); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_TRISTATE, tristate); + if (ret) + goto err_unlock; + + /* Configure pins that we use */ + ret = ops->reg_write(st, AD5592R_REG_DAC_EN, dac); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_ADC_EN, adc); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_OPEN_DRAIN, open_drain); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out); + if (ret) + goto err_unlock; + + ret = ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in); + if (ret) + goto err_unlock; + + /* Verify that we can read back at least one register */ + ret = ops->reg_read(st, AD5592R_REG_ADC_EN, &read_back); + if (!ret && (read_back & 0xff) != adc) + ret = -EIO; + +err_unlock: + mutex_unlock(&iio_dev->mlock); + return ret; +} + +static int ad5592r_write_raw(struct iio_dev *iio_dev, + struct iio_chan_spec const *chan, int val, int val2, long mask) +{ + struct ad5592r_state *st = iio_priv(iio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (val >= (1 << chan->scan_type.realbits) || val < 0) + return -EINVAL; + + /* Warn if we try to write to a ADC channel */ + WARN_ON(!chan->output); + + mutex_lock(&iio_dev->mlock); + ret = st->ops->write_dac(st, chan->channel, val); + if (!ret) + st->cached_dac[chan->channel] = val; + mutex_unlock(&iio_dev->mlock); + return ret; + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_VOLTAGE) { + bool gain; + + if (val == st->scale_avail[0][0] && + val2 == st->scale_avail[0][1]) + gain = false; + else if (val == st->scale_avail[1][0] && + val2 == st->scale_avail[1][1]) + gain = true; + else + return -EINVAL; + + ret = st->ops->reg_read(st, AD5592R_REG_CTRL, + &st->cached_gp_ctrl); + if (ret < 0) + return ret; + + if (chan->output) { + if (gain) + st->cached_gp_ctrl |= + AD5592R_REG_CTRL_DAC_RANGE; + else + st->cached_gp_ctrl &= + ~AD5592R_REG_CTRL_DAC_RANGE; + } else { + if (gain) + st->cached_gp_ctrl |= + AD5592R_REG_CTRL_ADC_RANGE; + else + st->cached_gp_ctrl &= + ~AD5592R_REG_CTRL_ADC_RANGE; + } + + ret = st->ops->reg_write(st, AD5592R_REG_CTRL, + st->cached_gp_ctrl);This write does not have mutex lock while above one has. No idea why+ if (ret < 0) + return ret; + + return ret; + + } + break; + default: + return -EINVAL; + } + + return 0; +} + +static int ad5592r_read_raw(struct iio_dev *iio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long m) +{ + struct ad5592r_state *st = iio_priv(iio_dev); + u16 read_val; + int ret; + + mutex_lock(&iio_dev->mlock); + + switch (m) { + case IIO_CHAN_INFO_RAW: + + if (!chan->output) { + ret = st->ops->read_adc(st, chan->channel, &read_val); + if (ret) + goto unlock; + + if ((read_val >> 12 & 0x7) != (chan->channel & 0x7)) { + dev_err(st->dev, "Error while reading channel %u\n", + chan->channel); + ret = -EIO; + goto unlock; + } + + read_val &= GENMASK(11, 0); + + } else { + read_val = st->cached_dac[chan->channel]; + } + + dev_dbg(st->dev, "Channel %u read: 0x%04hX\n", + chan->channel, read_val); + + *val = (int) read_val; + ret = IIO_VAL_INT; + break; + case IIO_CHAN_INFO_SCALE: + + *val = ad5592r_get_vref(st); + + if (chan->type == IIO_TEMP) { + s64 tmp = *val * (3767897513LL / 25LL); + *val = div_s64_rem(tmp, 1000000000LL, val2); + + ret = IIO_VAL_INT_PLUS_MICRO; + } else { + int mult; + + if (chan->output) + mult = !!(st->cached_gp_ctrl & + AD5592R_REG_CTRL_DAC_RANGE); + else + mult = !!(st->cached_gp_ctrl & + AD5592R_REG_CTRL_ADC_RANGE); + + *val *= ++mult; + + *val2 = chan->scan_type.realbits; + ret = IIO_VAL_FRACTIONAL_LOG2; + } + break; + case IIO_CHAN_INFO_OFFSET: + + ret = ad5592r_get_vref(st); + + if (st->cached_gp_ctrl & AD5592R_REG_CTRL_ADC_RANGE) + *val = (-34365 * 25) / ret; + else + *val = (-75365 * 25) / ret; + ret = IIO_VAL_INT; + break; + default: + return -EINVAL;mutex unlock missing in this case ret -EINVAL; goto unlock; (or break;)
Good catch - in theory we should never get there. I'll fix it.
+ } + +unlock: + mutex_unlock(&iio_dev->mlock); + return ret; +} + +static int ad5592r_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SCALE: + return IIO_VAL_INT_PLUS_NANO; + + default: + return IIO_VAL_INT_PLUS_MICRO; + } + + return -EINVAL; +} + +static const struct iio_info ad5592r_info = { + .read_raw = ad5592r_read_raw, + .write_raw = ad5592r_write_raw, + .write_raw_get_fmt = ad5592r_write_raw_get_fmt, + .driver_module = THIS_MODULE, +}; + +static ssize_t ad5592r_show_scale_available(struct iio_dev *iio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct ad5592r_state *st = iio_priv(iio_dev); + + return sprintf(buf, "%d.%09u %d.%09u\n", + st->scale_avail[0][0], st->scale_avail[0][1], + st->scale_avail[1][0], st->scale_avail[1][1]); +} + +static struct iio_chan_spec_ext_info ad5592r_ext_info[] = { + { + .name = "scale_available", + .read = ad5592r_show_scale_available, + .shared = true, + }, + {}, +}; + +static void ad5592r_setup_channel(struct iio_dev *iio_dev, + struct iio_chan_spec *chan, bool output, unsigned id) +{ + chan->type = IIO_VOLTAGE; + chan->indexed = 1; + chan->output = output; + chan->channel = id; + chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); + chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); + chan->scan_type.sign = 'u'; + chan->scan_type.realbits = 12; + chan->scan_type.storagebits = 16; + chan->ext_info = ad5592r_ext_info; +} + +static int ad5592r_alloc_channels(struct ad5592r_state *st) +{ + unsigned i, curr_channel = 0, + num_channels = st->num_channels; + struct iio_dev *iio_dev = iio_priv_to_dev(st); + struct iio_chan_spec *channels; + int ret; + + ret = device_property_read_u8_array(st->dev, "channel-modes", + st->channel_modes, num_channels); + if (ret) + return ret; + + channels = devm_kzalloc(st->dev, + (1 + 2 * num_channels) * sizeof(*channels), GFP_KERNEL); + if (!channels) + return -ENOMEM; + + for (i = 0; i < num_channels; i++) { + switch (st->channel_modes[i]) { + case CH_MODE_DAC: + ad5592r_setup_channel(iio_dev, &channels[curr_channel], + true, i); + curr_channel++; + break; + + case CH_MODE_ADC: + ad5592r_setup_channel(iio_dev, &channels[curr_channel], + false, i); + curr_channel++; + break; + + case CH_MODE_DAC_AND_ADC: + ad5592r_setup_channel(iio_dev, &channels[curr_channel], + true, i); + curr_channel++; + ad5592r_setup_channel(iio_dev, &channels[curr_channel], + false, i); + curr_channel++; + break; + + default: + continue; + } + } + + channels[curr_channel].type = IIO_TEMP; + channels[curr_channel].channel = 8; + channels[curr_channel].info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET); + curr_channel++; + + iio_dev->num_channels = curr_channel; + iio_dev->channels = channels; + + return 0; +} + +static void ad5592r_init_scales(struct ad5592r_state *st, int vref_mV) +{ + s64 tmp = (s64)vref_mV * 1000000000LL >> 12; + + st->scale_avail[0][0] = + div_s64_rem(tmp, 1000000000LL, &st->scale_avail[0][1]); + st->scale_avail[1][0] = + div_s64_rem(tmp * 2, 1000000000LL, &st->scale_avail[1][1]); +} + +int ad5592r_probe(struct device *dev, const char *name, + const struct ad5592r_rw_ops *ops) +{ + struct iio_dev *iio_dev; + struct ad5592r_state *st; + int ret; + + iio_dev = devm_iio_device_alloc(dev, sizeof(*st)); + if (!iio_dev) + return -ENOMEM; + + st = iio_priv(iio_dev); + st->dev = dev; + st->ops = ops; + st->num_channels = 8; + dev_set_drvdata(dev, iio_dev); + + st->reg = devm_regulator_get_optional(dev, "vref"); + if (IS_ERR(st->reg)) { + if ((PTR_ERR(st->reg) != -ENODEV) && dev->of_node) + return PTR_ERR(st->reg); + + st->reg = NULL;So in this case with continue without enabled regulator?
Yes - that's how you tell the driver to use the internal reference.
+ } else { + ret = regulator_enable(st->reg); + if (ret) + return ret; + } + + iio_dev->dev.parent = dev; + iio_dev->name = name; + iio_dev->info = &ad5592r_info; + iio_dev->modes = INDIO_DIRECT_MODE; + + ad5592r_init_scales(st, ad5592r_get_vref(st)); + + ret = ad5592r_reset(st); + if (ret) + goto error_disable_reg; + + ret = ops->reg_write(st, AD5592R_REG_PD, + (st->reg == NULL) ? AD5592R_REG_PD_EN_REF : 0); + if (ret) + goto error_disable_reg; + + ret = ad5592r_alloc_channels(st); + if (ret) + goto error_disable_reg; + + ret = ad5592r_set_channel_modes(st); + if (ret) + goto error_disable_reg; + + ret = devm_iio_device_register(dev, iio_dev); + if (ret) + goto error_disable_reg; + + return ad5592r_gpio_init(st); + +error_disable_reg: + if (st->reg) + regulator_disable(st->reg); + + return ret; +} +EXPORT_SYMBOL_GPL(ad5592r_probe); + +int ad5592r_remove(struct device *dev) +{ + struct iio_dev *iio_dev = dev_get_drvdata(dev); + struct ad5592r_state *st = iio_priv(iio_dev); + unsigned int i; + + /* Reset all channels */ + for (i = 0; i < ARRAY_SIZE(st->channel_modes); i++) + st->channel_modes[i] = CH_MODE_UNUSED_PULL_DOWN; + + if (st->reg) + regulator_disable(st->reg); + + if (st->gpio_map) + ad5592r_gpio_cleanup(st); + + return ad5592r_set_channel_modes(st); +} +EXPORT_SYMBOL_GPL(ad5592r_remove); + +MODULE_AUTHOR("Paul Cercueil <paul.cercueil@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/dac/ad5592r-base.h b/drivers/iio/dac/ad5592r-base.h new file mode 100644 index 0000000..162e833 --- /dev/null +++ b/drivers/iio/dac/ad5592r-base.h @@ -0,0 +1,77 @@ +/* + * AD5592R / AD5593R Digital <-> Analog converters driver + * + * Copyright 2015-2016 Analog Devices Inc. + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx> + * + * Licensed under the GPL-2. + */ + +#ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__ +#define __DRIVERS_IIO_DAC_AD5592R_BASE_H__ + +#include <linux/types.h> +#include <linux/cache.h> +#include <linux/mutex.h> +#include <linux/gpio/driver.h> + +struct device; +struct ad5592r_state; + +enum ad5592r_registers { + AD5592R_REG_NOOP = 0x0, + AD5592R_REG_DAC_READBACK = 0x1, + AD5592R_REG_ADC_SEQ = 0x2, + AD5592R_REG_CTRL = 0x3, + AD5592R_REG_ADC_EN = 0x4, + AD5592R_REG_DAC_EN = 0x5, + AD5592R_REG_PULLDOWN = 0x6, + AD5592R_REG_LDAC = 0x7, + AD5592R_REG_GPIO_OUT_EN = 0x8, + AD5592R_REG_GPIO_SET = 0x9, + AD5592R_REG_GPIO_IN_EN = 0xA, + AD5592R_REG_PD = 0xB, + AD5592R_REG_OPEN_DRAIN = 0xC, + AD5592R_REG_TRISTATE = 0xD, + AD5592R_REG_RESET = 0xF, +}; + +#define AD5592R_REG_PD_EN_REF BIT(9) +#define AD5592R_REG_CTRL_ADC_RANGE BIT(5) +#define AD5592R_REG_CTRL_DAC_RANGE BIT(4) + +struct ad5592r_rw_ops { + int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value); + int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value); + int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value); + int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value); + int (*gpio_read)(struct ad5592r_state *st, u8 *value); +}; + +struct ad5592r_state { + struct device *dev; + struct regulator *reg; +#ifdef CONFIG_GPIOLIB + struct gpio_chip gpiochip; + struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */ +#endif + unsigned int num_channels; + const struct ad5592r_rw_ops *ops; + int scale_avail[2][2]; + u16 cached_dac[8]; + u16 cached_gp_ctrl; + u8 channel_modes[8]; + u8 gpio_map; + u8 gpio_out; + u8 gpio_in; + u8 gpio_val; + + __be16 spi_msg ____cacheline_aligned; + __be16 spi_msg_nop; +}; + +int ad5592r_probe(struct device *dev, const char *name, + const struct ad5592r_rw_ops *ops); +int ad5592r_remove(struct device *dev); + +#endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */ diff --git a/drivers/iio/dac/ad5592r.c b/drivers/iio/dac/ad5592r.c new file mode 100644 index 0000000..7881160 --- /dev/null +++ b/drivers/iio/dac/ad5592r.c @@ -0,0 +1,163 @@ +/* + * AD5592R Digital <-> Analog converters driver + * + * Copyright 2015-2016 Analog Devices Inc. + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx> + * + * Licensed under the GPL-2. + */ + +#include "ad5592r-base.h" + +#include <linux/bitops.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/spi/spi.h> + +#define AD5592R_GPIO_READBACK_EN BIT(10) +#define AD5592R_LDAC_READBACK_EN BIT(6) + +static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, u16 *buf) +{ + struct spi_device *spi = container_of(st->dev, struct spi_device, dev); + struct spi_transfer t = { + .tx_buf = &st->spi_msg_nop, + .rx_buf = buf, + .len = 2 + }; + + st->spi_msg_nop = 0; /* NOP */ + + return spi_sync_transfer(spi, &t, 1); +} + +static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) +{ + struct spi_device *spi = container_of(st->dev, struct spi_device, dev); + + st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value); + + return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); +} + +static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) +{ + struct spi_device *spi = container_of(st->dev, struct spi_device, dev); + int ret; + + st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan)); + + ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); + if (ret) + return ret; + + /* Invalid data */ + ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); + if (ret) + return ret; + + ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); + if (ret) + return ret; + + *value = be16_to_cpu(st->spi_msg); + + return 0; +} + +static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) +{ + struct spi_device *spi = container_of(st->dev, struct spi_device, dev); + + st->spi_msg = cpu_to_be16((reg << 11) | value); + + return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); +} + +static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) +{ + struct spi_device *spi = container_of(st->dev, struct spi_device, dev); + int ret; + + st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) | + AD5592R_LDAC_READBACK_EN | (reg << 2)); + + ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg)); + if (ret) + return ret; + + ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); + if (ret) + return ret; + + if (value) + *value = be16_to_cpu(st->spi_msg); + + return 0; +} + +static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) +{ + int ret; + + ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN, + AD5592R_GPIO_READBACK_EN | st->gpio_in); + if (ret) + return ret; + + ret = ad5592r_spi_wnop_r16(st, &st->spi_msg); + if (ret) + return ret; + + if (value) + *value = (u8) be16_to_cpu(st->spi_msg);So if value=0 then we do not error out, but we just leave value intact?
I think we don't need this check at all...
+ + return 0; +} + +static const struct ad5592r_rw_ops ad5592r_rw_ops = { + .write_dac = ad5592r_write_dac, + .read_adc = ad5592r_read_adc, + .reg_write = ad5592r_reg_write, + .reg_read = ad5592r_reg_read, + .gpio_read = ad5593r_gpio_read, +}; + +static int ad5592r_spi_probe(struct spi_device *spi) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + + return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops); +} + +static int ad5592r_spi_remove(struct spi_device *spi) +{ + return ad5592r_remove(&spi->dev); +} + +static const struct spi_device_id ad5592r_spi_ids[] = { + { .name = "ad5592r", }, + {} +}; +MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids); + +static const struct of_device_id ad5592r_of_match[] = { + { .compatible = "adi,ad5592r", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ad5592r_of_match); + +static struct spi_driver ad5592r_spi_driver = { + .driver = { + .name = "ad5592r", + .of_match_table = of_match_ptr(ad5592r_of_match), + }, + .probe = ad5592r_spi_probe, + .remove = ad5592r_spi_remove, + .id_table = ad5592r_spi_ids, +}; +module_spi_driver(ad5592r_spi_driver); + +MODULE_AUTHOR("Paul Cercueil <paul.cercueil@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/dac/ad5593r.c b/drivers/iio/dac/ad5593r.c new file mode 100644 index 0000000..dd52cab --- /dev/null +++ b/drivers/iio/dac/ad5593r.c @@ -0,0 +1,136 @@ +/* + * AD5593R Digital <-> Analog converters driver + * + * Copyright 2015-2016 Analog Devices Inc. + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx> + * + * Licensed under the GPL-2. + */ + +#include "ad5592r-base.h" + +#include <linux/bitops.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of.h> + +#define AD5593R_MODE_CONF (0 << 4) +#define AD5593R_MODE_DAC_WRITE (1 << 4) +#define AD5593R_MODE_ADC_READBACK (4 << 4) +#define AD5593R_MODE_DAC_READBACK (5 << 4) +#define AD5593R_MODE_GPIO_READBACK (6 << 4) +#define AD5593R_MODE_REG_READBACK (7 << 4) + +static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + + return i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_DAC_WRITE | chan, value); +} + +static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + s32 val; + + val = i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan)); + if (val < 0) + return (int) val; + + /* Invalid data */ + val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK); + if (val < 0) + return (int) val;This above seems like a nasty hack - for hardware or something else?
The AD5592R SPI version requires this extra read. It's part of the required sequence. Figure 40. Single-Channel ADC Conversion Sequence. But for the I2C version it doesn't seem to be necessary. I'll double check.
+ + val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK); + if (val < 0) + return (int) val; + + *value = (u16) val; + + return 0; +} + +static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + + return i2c_smbus_write_word_swapped(i2c, + AD5593R_MODE_CONF | reg, value); +} + +static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + s32 val; + + val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg); + if (val < 0) + return (int) val; + + *value = (u16) val; + + return 0; +} + +static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value) +{ + struct i2c_client *i2c = to_i2c_client(st->dev); + s32 val; + + val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK); + if (val < 0) + return (int) val; + + *value = (u8) val; + + return 0; +} + +static const struct ad5592r_rw_ops ad5593r_rw_ops = { + .write_dac = ad5593r_write_dac, + .read_adc = ad5593r_read_adc, + .reg_write = ad5593r_reg_write, + .reg_read = ad5593r_reg_read, + .gpio_read = ad5593r_gpio_read, +}; + +static int ad5593r_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops); +} + +static int ad5593r_i2c_remove(struct i2c_client *i2c) +{ + return ad5592r_remove(&i2c->dev); +} + +static const struct i2c_device_id ad5593r_i2c_ids[] = { + { .name = "ad5593r", }, + {}, +}; +MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids); + +static const struct of_device_id ad5593r_of_match[] = { + { .compatible = "adi,ad5593r", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ad5593r_of_match); + +static struct i2c_driver ad5593r_driver = { + .driver = { + .name = "ad5593r", + .of_match_table = of_match_ptr(ad5593r_of_match), + }, + .probe = ad5593r_i2c_probe, + .remove = ad5593r_i2c_remove, + .id_table = ad5593r_i2c_ids, +}; +module_i2c_driver(ad5593r_driver); + +MODULE_AUTHOR("Paul Cercueil <paul.cercueil@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters"); +MODULE_LICENSE("GPL v2"); diff --git a/include/dt-bindings/iio/adi,ad5592r.h b/include/dt-bindings/iio/adi,ad5592r.h new file mode 100644 index 0000000..6bd519b --- /dev/null +++ b/include/dt-bindings/iio/adi,ad5592r.h @@ -0,0 +1,16 @@ + +#ifndef _DT_BINDINGS_ADI_AD5592R_H +#define _DT_BINDINGS_ADI_AD5592R_H + + +#define CH_MODE_ADC 1 +#define CH_MODE_DAC 2 +#define CH_MODE_DAC_AND_ADC 3 +#define CH_MODE_UNUSED_PULL_DOWN 4 +#define CH_MODE_UNUSED_OUT_LOW 5 +#define CH_MODE_UNUSED_OUT_HIGH 6 +#define CH_MODE_UNUSED_OUT_TRISTATE 7 +#define CH_MODE_GPIO 8 +#define CH_MODE_GPIO_OPEN_DRAIN 9 + +#endif /* _DT_BINDINGS_ADI_AD5592R_H */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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