diff options
Diffstat (limited to 'drivers/iio/dac/ad5446.c')
| -rw-r--r-- | drivers/iio/dac/ad5446.c | 506 |
1 files changed, 59 insertions, 447 deletions
diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c index ad304b0fec08..46a2eadb1d9b 100644 --- a/drivers/iio/dac/ad5446.c +++ b/drivers/iio/dac/ad5446.c @@ -1,73 +1,35 @@ // SPDX-License-Identifier: GPL-2.0-or-later /* - * AD5446 SPI DAC driver + * AD5446 CORE DAC driver * * Copyright 2010 Analog Devices Inc. */ -#include <linux/interrupt.h> -#include <linux/workqueue.h> +#include <linux/array_size.h> +#include <linux/cleanup.h> #include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/list.h> -#include <linux/spi/spi.h> -#include <linux/i2c.h> -#include <linux/regulator/consumer.h> #include <linux/err.h> -#include <linux/module.h> -#include <linux/mod_devicetable.h> - +#include <linux/export.h> #include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> +#include <linux/kstrtox.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/regulator/consumer.h> +#include <linux/sysfs.h> -#include <linux/unaligned.h> +#include "ad5446.h" #define MODE_PWRDWN_1k 0x1 #define MODE_PWRDWN_100k 0x2 #define MODE_PWRDWN_TRISTATE 0x3 -/** - * struct ad5446_state - driver instance specific data - * @dev: this device - * @chip_info: chip model specific constants, available modes etc - * @vref_mv: actual reference voltage used - * @cached_val: store/retrieve values during power down - * @pwr_down_mode: power down mode (1k, 100k or tristate) - * @pwr_down: true if the device is in power down - * @lock: lock to protect the data buffer during write ops - */ - -struct ad5446_state { - struct device *dev; - const struct ad5446_chip_info *chip_info; - unsigned short vref_mv; - unsigned cached_val; - unsigned pwr_down_mode; - unsigned pwr_down; - struct mutex lock; -}; - -/** - * struct ad5446_chip_info - chip specific information - * @channel: channel spec for the DAC - * @int_vref_mv: AD5620/40/60: the internal reference voltage - * @write: chip specific helper function to write to the register - */ - -struct ad5446_chip_info { - struct iio_chan_spec channel; - u16 int_vref_mv; - int (*write)(struct ad5446_state *st, unsigned val); -}; - static const char * const ad5446_powerdown_modes[] = { "1kohm_to_gnd", "100kohm_to_gnd", "three_state" }; static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan, unsigned int mode) + const struct iio_chan_spec *chan, + unsigned int mode) { struct ad5446_state *st = iio_priv(indio_dev); @@ -77,7 +39,7 @@ static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev, } static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev, - const struct iio_chan_spec *chan) + const struct iio_chan_spec *chan) { struct ad5446_state *st = iio_priv(indio_dev); @@ -92,9 +54,9 @@ static const struct iio_enum ad5446_powerdown_mode_enum = { }; static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) { struct ad5446_state *st = iio_priv(indio_dev); @@ -102,9 +64,9 @@ static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev, } static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - const char *buf, size_t len) + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) { struct ad5446_state *st = iio_priv(indio_dev); unsigned int shift; @@ -116,7 +78,7 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, if (ret) return ret; - mutex_lock(&st->lock); + guard(mutex)(&st->lock); st->pwr_down = powerdown; if (st->pwr_down) { @@ -127,12 +89,13 @@ static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev, } ret = st->chip_info->write(st, val); - mutex_unlock(&st->lock); + if (ret) + return ret; - return ret ? ret : len; + return len; } -static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = { +const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = { { .name = "powerdown", .read = ad5446_read_dac_powerdown, @@ -143,28 +106,7 @@ static const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[] = { IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5446_powerdown_mode_enum), { } }; - -#define _AD5446_CHANNEL(bits, storage, _shift, ext) { \ - .type = IIO_VOLTAGE, \ - .indexed = 1, \ - .output = 1, \ - .channel = 0, \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ - .scan_type = { \ - .sign = 'u', \ - .realbits = (bits), \ - .storagebits = (storage), \ - .shift = (_shift), \ - }, \ - .ext_info = (ext), \ -} - -#define AD5446_CHANNEL(bits, storage, shift) \ - _AD5446_CHANNEL(bits, storage, shift, NULL) - -#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \ - _AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown) +EXPORT_SYMBOL_NS_GPL(ad5446_ext_info_powerdown, "IIO_AD5446"); static int ad5446_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, @@ -186,32 +128,35 @@ static int ad5446_read_raw(struct iio_dev *indio_dev, return -EINVAL; } -static int ad5446_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long mask) +static int ad5446_write_dac_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int val) { struct ad5446_state *st = iio_priv(indio_dev); - int ret = 0; + if (val >= (1 << chan->scan_type.realbits) || val < 0) + return -EINVAL; + + val <<= chan->scan_type.shift; + guard(mutex)(&st->lock); + + st->cached_val = val; + if (st->pwr_down) + return 0; + + return st->chip_info->write(st, val); +} + +static int ad5446_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, + int val2, long mask) +{ switch (mask) { case IIO_CHAN_INFO_RAW: - if (val >= (1 << chan->scan_type.realbits) || val < 0) - return -EINVAL; - - val <<= chan->scan_type.shift; - mutex_lock(&st->lock); - st->cached_val = val; - if (!st->pwr_down) - ret = st->chip_info->write(st, val); - mutex_unlock(&st->lock); - break; + return ad5446_write_dac_raw(indio_dev, chan, val); default: - ret = -EINVAL; + return -EINVAL; } - - return ret; } static const struct iio_info ad5446_info = { @@ -219,8 +164,8 @@ static const struct iio_info ad5446_info = { .write_raw = ad5446_write_raw, }; -static int ad5446_probe(struct device *dev, const char *name, - const struct ad5446_chip_info *chip_info) +int ad5446_probe(struct device *dev, const char *name, + const struct ad5446_chip_info *chip_info) { struct ad5446_state *st; struct iio_dev *indio_dev; @@ -241,7 +186,9 @@ static int ad5446_probe(struct device *dev, const char *name, indio_dev->channels = &st->chip_info->channel; indio_dev->num_channels = 1; - mutex_init(&st->lock); + ret = devm_mutex_init(dev, &st->lock); + if (ret) + return ret; st->pwr_down_mode = MODE_PWRDWN_1k; @@ -249,354 +196,19 @@ static int ad5446_probe(struct device *dev, const char *name, if (ret < 0 && ret != -ENODEV) return ret; if (ret == -ENODEV) { - if (chip_info->int_vref_mv) - st->vref_mv = chip_info->int_vref_mv; - else - dev_warn(dev, "reference voltage unspecified\n"); + if (!chip_info->int_vref_mv) + return dev_err_probe(dev, ret, + "reference voltage unspecified\n"); + + st->vref_mv = chip_info->int_vref_mv; } else { st->vref_mv = ret / 1000; } return devm_iio_device_register(dev, indio_dev); } - -#if IS_ENABLED(CONFIG_SPI_MASTER) - -static int ad5446_write(struct ad5446_state *st, unsigned val) -{ - struct spi_device *spi = to_spi_device(st->dev); - __be16 data = cpu_to_be16(val); - - return spi_write(spi, &data, sizeof(data)); -} - -static int ad5660_write(struct ad5446_state *st, unsigned val) -{ - struct spi_device *spi = to_spi_device(st->dev); - uint8_t data[3]; - - put_unaligned_be24(val, &data[0]); - - return spi_write(spi, data, sizeof(data)); -} - -/* - * ad5446_supported_spi_device_ids: - * The AD5620/40/60 parts are available in different fixed internal reference - * voltage options. The actual part numbers may look differently - * (and a bit cryptic), however this style is used to make clear which - * parts are supported here. - */ -enum ad5446_supported_spi_device_ids { - ID_AD5300, - ID_AD5310, - ID_AD5320, - ID_AD5444, - ID_AD5446, - ID_AD5450, - ID_AD5451, - ID_AD5541A, - ID_AD5512A, - ID_AD5553, - ID_AD5600, - ID_AD5601, - ID_AD5611, - ID_AD5621, - ID_AD5641, - ID_AD5620_2500, - ID_AD5620_1250, - ID_AD5640_2500, - ID_AD5640_1250, - ID_AD5660_2500, - ID_AD5660_1250, - ID_AD5662, -}; - -static const struct ad5446_chip_info ad5446_spi_chip_info[] = { - [ID_AD5300] = { - .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), - .write = ad5446_write, - }, - [ID_AD5310] = { - .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), - .write = ad5446_write, - }, - [ID_AD5320] = { - .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), - .write = ad5446_write, - }, - [ID_AD5444] = { - .channel = AD5446_CHANNEL(12, 16, 2), - .write = ad5446_write, - }, - [ID_AD5446] = { - .channel = AD5446_CHANNEL(14, 16, 0), - .write = ad5446_write, - }, - [ID_AD5450] = { - .channel = AD5446_CHANNEL(8, 16, 6), - .write = ad5446_write, - }, - [ID_AD5451] = { - .channel = AD5446_CHANNEL(10, 16, 4), - .write = ad5446_write, - }, - [ID_AD5541A] = { - .channel = AD5446_CHANNEL(16, 16, 0), - .write = ad5446_write, - }, - [ID_AD5512A] = { - .channel = AD5446_CHANNEL(12, 16, 4), - .write = ad5446_write, - }, - [ID_AD5553] = { - .channel = AD5446_CHANNEL(14, 16, 0), - .write = ad5446_write, - }, - [ID_AD5600] = { - .channel = AD5446_CHANNEL(16, 16, 0), - .write = ad5446_write, - }, - [ID_AD5601] = { - .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6), - .write = ad5446_write, - }, - [ID_AD5611] = { - .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4), - .write = ad5446_write, - }, - [ID_AD5621] = { - .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), - .write = ad5446_write, - }, - [ID_AD5641] = { - .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), - .write = ad5446_write, - }, - [ID_AD5620_2500] = { - .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), - .int_vref_mv = 2500, - .write = ad5446_write, - }, - [ID_AD5620_1250] = { - .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2), - .int_vref_mv = 1250, - .write = ad5446_write, - }, - [ID_AD5640_2500] = { - .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), - .int_vref_mv = 2500, - .write = ad5446_write, - }, - [ID_AD5640_1250] = { - .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0), - .int_vref_mv = 1250, - .write = ad5446_write, - }, - [ID_AD5660_2500] = { - .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), - .int_vref_mv = 2500, - .write = ad5660_write, - }, - [ID_AD5660_1250] = { - .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), - .int_vref_mv = 1250, - .write = ad5660_write, - }, - [ID_AD5662] = { - .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0), - .write = ad5660_write, - }, -}; - -static const struct spi_device_id ad5446_spi_ids[] = { - {"ad5300", ID_AD5300}, - {"ad5310", ID_AD5310}, - {"ad5320", ID_AD5320}, - {"ad5444", ID_AD5444}, - {"ad5446", ID_AD5446}, - {"ad5450", ID_AD5450}, - {"ad5451", ID_AD5451}, - {"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */ - {"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */ - {"ad5512a", ID_AD5512A}, - {"ad5541a", ID_AD5541A}, - {"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */ - {"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */ - {"ad5553", ID_AD5553}, - {"ad5600", ID_AD5600}, - {"ad5601", ID_AD5601}, - {"ad5611", ID_AD5611}, - {"ad5621", ID_AD5621}, - {"ad5641", ID_AD5641}, - {"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */ - {"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */ - {"ad5640-2500", ID_AD5640_2500}, - {"ad5640-1250", ID_AD5640_1250}, - {"ad5660-2500", ID_AD5660_2500}, - {"ad5660-1250", ID_AD5660_1250}, - {"ad5662", ID_AD5662}, - {"dac081s101", ID_AD5300}, /* compatible Texas Instruments chips */ - {"dac101s101", ID_AD5310}, - {"dac121s101", ID_AD5320}, - {"dac7512", ID_AD5320}, - { } -}; -MODULE_DEVICE_TABLE(spi, ad5446_spi_ids); - -static const struct of_device_id ad5446_of_ids[] = { - { .compatible = "ti,dac7512" }, - { } -}; -MODULE_DEVICE_TABLE(of, ad5446_of_ids); - -static int ad5446_spi_probe(struct spi_device *spi) -{ - const struct spi_device_id *id = spi_get_device_id(spi); - - return ad5446_probe(&spi->dev, id->name, - &ad5446_spi_chip_info[id->driver_data]); -} - -static struct spi_driver ad5446_spi_driver = { - .driver = { - .name = "ad5446", - .of_match_table = ad5446_of_ids, - }, - .probe = ad5446_spi_probe, - .id_table = ad5446_spi_ids, -}; - -static int __init ad5446_spi_register_driver(void) -{ - return spi_register_driver(&ad5446_spi_driver); -} - -static void ad5446_spi_unregister_driver(void) -{ - spi_unregister_driver(&ad5446_spi_driver); -} - -#else - -static inline int ad5446_spi_register_driver(void) { return 0; } -static inline void ad5446_spi_unregister_driver(void) { } - -#endif - -#if IS_ENABLED(CONFIG_I2C) - -static int ad5622_write(struct ad5446_state *st, unsigned val) -{ - struct i2c_client *client = to_i2c_client(st->dev); - __be16 data = cpu_to_be16(val); - int ret; - - ret = i2c_master_send(client, (char *)&data, sizeof(data)); - if (ret < 0) - return ret; - if (ret != sizeof(data)) - return -EIO; - - return 0; -} - -/* - * ad5446_supported_i2c_device_ids: - * The AD5620/40/60 parts are available in different fixed internal reference - * voltage options. The actual part numbers may look differently - * (and a bit cryptic), however this style is used to make clear which - * parts are supported here. - */ -enum ad5446_supported_i2c_device_ids { - ID_AD5602, - ID_AD5612, - ID_AD5622, -}; - -static const struct ad5446_chip_info ad5446_i2c_chip_info[] = { - [ID_AD5602] = { - .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4), - .write = ad5622_write, - }, - [ID_AD5612] = { - .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2), - .write = ad5622_write, - }, - [ID_AD5622] = { - .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0), - .write = ad5622_write, - }, -}; - -static int ad5446_i2c_probe(struct i2c_client *i2c) -{ - const struct i2c_device_id *id = i2c_client_get_device_id(i2c); - return ad5446_probe(&i2c->dev, id->name, - &ad5446_i2c_chip_info[id->driver_data]); -} - -static const struct i2c_device_id ad5446_i2c_ids[] = { - {"ad5301", ID_AD5602}, - {"ad5311", ID_AD5612}, - {"ad5321", ID_AD5622}, - {"ad5602", ID_AD5602}, - {"ad5612", ID_AD5612}, - {"ad5622", ID_AD5622}, - { } -}; -MODULE_DEVICE_TABLE(i2c, ad5446_i2c_ids); - -static struct i2c_driver ad5446_i2c_driver = { - .driver = { - .name = "ad5446", - }, - .probe = ad5446_i2c_probe, - .id_table = ad5446_i2c_ids, -}; - -static int __init ad5446_i2c_register_driver(void) -{ - return i2c_add_driver(&ad5446_i2c_driver); -} - -static void __exit ad5446_i2c_unregister_driver(void) -{ - i2c_del_driver(&ad5446_i2c_driver); -} - -#else - -static inline int ad5446_i2c_register_driver(void) { return 0; } -static inline void ad5446_i2c_unregister_driver(void) { } - -#endif - -static int __init ad5446_init(void) -{ - int ret; - - ret = ad5446_spi_register_driver(); - if (ret) - return ret; - - ret = ad5446_i2c_register_driver(); - if (ret) { - ad5446_spi_unregister_driver(); - return ret; - } - - return 0; -} -module_init(ad5446_init); - -static void __exit ad5446_exit(void) -{ - ad5446_i2c_unregister_driver(); - ad5446_spi_unregister_driver(); -} -module_exit(ad5446_exit); +EXPORT_SYMBOL_NS_GPL(ad5446_probe, "IIO_AD5446"); MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); -MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC"); +MODULE_DESCRIPTION("Analog Devices CORE AD5446 DAC and similar devices"); MODULE_LICENSE("GPL v2"); |