From patchwork Tue Oct 17 10:42:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 10011635 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8629460235 for ; Tue, 17 Oct 2017 10:42:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7810728845 for ; Tue, 17 Oct 2017 10:42:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6C70A28847; Tue, 17 Oct 2017 10:42:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5C3C628845 for ; Tue, 17 Oct 2017 10:42:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760955AbdJQKmp (ORCPT ); Tue, 17 Oct 2017 06:42:45 -0400 Received: from mailout1.hostsharing.net ([83.223.95.204]:52777 "EHLO mailout1.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757656AbdJQKmo (ORCPT ); Tue, 17 Oct 2017 06:42:44 -0400 Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.hostsharing.net", Issuer "COMODO RSA Organization Validation Secure Server CA" (not verified)) by mailout1.hostsharing.net (Postfix) with ESMTPS id 8C45B10190FA0; Tue, 17 Oct 2017 12:42:43 +0200 (CEST) Received: from localhost (p4FC97DB7.dip0.t-ipconnect.de [79.201.125.183]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 4970D603DFA9; Tue, 17 Oct 2017 12:42:43 +0200 (CEST) X-Mailbox-Line: From a3d85aed78a808d170dc4d52253532a49ae02d22 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: References: From: Lukas Wunner Date: Tue, 17 Oct 2017 12:42:00 +0200 Subject: [PATCH v2 2/3] iio: dac: Add Texas Instruments 8/10/12-bit 2/4-channel DAC driver To: Jonathan Cameron Cc: Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Mathias Duckeck , Phil Elwell , linux-iio@vger.kernel.org Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The DACrrcS085 (rr = 08/10/12, c = 2/4) family of SPI DACs was inherited by TI when they acquired National Semiconductor in 2011. This driver was developed for and tested with the DAC082S085 built into the Revolution Pi by KUNBUS, but should work with any of the other chips as they share the same programming interface. There is also a family of I2C DACs with just a single channel called DACrr1C08x (rr = 08/10/12, x = 1/5). Their programming interface is very similar and it should be possible to extend the driver for these chips with moderate effort. Alternatively they could be integrated into ad5446.c. (The AD5301/AD5311/AD5321 use different power-down modes but otherwise appear to be comparable.) Furthermore there is a family of 8-channel DACs called DACrr8S085 (rr = 08/10/12) as well as two 16-bit DACs called DAC161Sxxx (xxx = 055/997). These are more complicated devices with support for daisy-chaining and the ability to power down each channel separately. They could either be handled by a separate driver or integrated into the present driver with a larger effort. Cc: Mathias Duckeck Signed-off-by: Lukas Wunner --- Documentation/ABI/testing/sysfs-bus-iio | 1 + drivers/iio/dac/Kconfig | 10 + drivers/iio/dac/Makefile | 1 + drivers/iio/dac/ti-dac082s085.c | 351 ++++++++++++++++++++++++++++++++ 4 files changed, 363 insertions(+) create mode 100644 drivers/iio/dac/ti-dac082s085.c diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 3fc79185cc56..2e3f919485f4 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -522,6 +522,7 @@ Description: Specifies the output powerdown mode. DAC output stage is disconnected from the amplifier and 1kohm_to_gnd: connected to ground via an 1kOhm resistor, + 2.5kohm_to_gnd: connected to ground via a 2.5kOhm resistor, 6kohm_to_gnd: connected to ground via a 6kOhm resistor, 20kohm_to_gnd: connected to ground via a 20kOhm resistor, 90kohm_to_gnd: connected to ground via a 90kOhm resistor, diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig index d187233dec3a..965d5c0d2468 100644 --- a/drivers/iio/dac/Kconfig +++ b/drivers/iio/dac/Kconfig @@ -310,6 +310,16 @@ config STM32_DAC config STM32_DAC_CORE tristate +config TI_DAC082S085 + tristate "Texas Instruments 8/10/12-bit 2/4-channel DAC driver" + depends on SPI_MASTER + help + Driver for the Texas Instruments (formerly National Semiconductor) + DAC082S085, DAC102S085, DAC122S085, DAC084S085, DAC104S085 and + DAC124S085. + + If compiled as a module, it will be called ti-dac082s085. + config VF610_DAC tristate "Vybrid vf610 DAC driver" depends on OF diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile index 8fe5af231698..4785858e04cc 100644 --- a/drivers/iio/dac/Makefile +++ b/drivers/iio/dac/Makefile @@ -33,4 +33,5 @@ obj-$(CONFIG_MCP4725) += mcp4725.o obj-$(CONFIG_MCP4922) += mcp4922.o obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o obj-$(CONFIG_STM32_DAC) += stm32-dac.o +obj-$(CONFIG_TI_DAC082S085) += ti-dac082s085.o obj-$(CONFIG_VF610_DAC) += vf610_dac.o diff --git a/drivers/iio/dac/ti-dac082s085.c b/drivers/iio/dac/ti-dac082s085.c new file mode 100644 index 000000000000..0fefb110be69 --- /dev/null +++ b/drivers/iio/dac/ti-dac082s085.c @@ -0,0 +1,351 @@ +/* + * ti-dac082s085.c - Texas Instruments 8/10/12-bit 2/4-channel DAC driver + * + * Copyright (C) 2017 KUNBUS GmbH + * + * http://www.ti.com/lit/ds/symlink/dac082s085.pdf + * http://www.ti.com/lit/ds/symlink/dac102s085.pdf + * http://www.ti.com/lit/ds/symlink/dac122s085.pdf + * http://www.ti.com/lit/ds/symlink/dac084s085.pdf + * http://www.ti.com/lit/ds/symlink/dac104s085.pdf + * http://www.ti.com/lit/ds/symlink/dac124s085.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 + +/** + * struct ti_dac_chip - TI DAC chip + * @lock: protects write sequences + * @vref: regulator generating Vref + * @mesg: SPI message to perform a write + * @xfer: SPI transfer used by @mesg + * @buf: buffer for @xfer + * @val: cached value of each output + * @powerdown: whether the chip is powered down + * @powerdown_mode: selected by the user + * @resolution: resolution of the chip + */ +struct ti_dac_chip { + struct mutex lock; + struct regulator *vref; + struct spi_message mesg; + struct spi_transfer xfer; + u8 buf[2] ____cacheline_aligned; + u16 val[4]; + bool powerdown; + u8 powerdown_mode; + u8 resolution; +}; + +#define WRITE_NOT_UPDATE(chan) (0x00 | (chan) << 6) +#define WRITE_AND_UPDATE(chan) (0x10 | (chan) << 6) +#define WRITE_ALL_UPDATE 0x20 +#define POWERDOWN(mode) (0x30 | ((mode) + 1) << 6) + +static int ti_dac_cmd(struct ti_dac_chip *ti_dac, u8 cmd, u16 val) +{ + u8 shift = 12 - ti_dac->resolution; + + ti_dac->buf[0] = cmd | (val >> (8 - shift)); + ti_dac->buf[1] = (val << shift) & 0xff; + return spi_sync(ti_dac->mesg.spi, &ti_dac->mesg); +} + +static const char * const ti_dac_powerdown_modes[] = { + "2.5kohm_to_gnd", "100kohm_to_gnd", "three_state", +}; + +static int ti_dac_get_powerdown_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + + return ti_dac->powerdown_mode; +} + +static int ti_dac_set_powerdown_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int mode) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + int ret = 0; + + if (ti_dac->powerdown_mode == mode) + return 0; + + mutex_lock(&ti_dac->lock); + if (ti_dac->powerdown) { + ret = ti_dac_cmd(ti_dac, POWERDOWN(mode), 0); + if (ret) + goto out; + } + ti_dac->powerdown_mode = mode; + +out: + mutex_unlock(&ti_dac->lock); + return ret; +} + +static const struct iio_enum ti_dac_powerdown_mode = { + .items = ti_dac_powerdown_modes, + .num_items = ARRAY_SIZE(ti_dac_powerdown_modes), + .get = ti_dac_get_powerdown_mode, + .set = ti_dac_set_powerdown_mode, +}; + +static ssize_t ti_dac_read_powerdown(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + char *buf) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + + return sprintf(buf, "%d\n", ti_dac->powerdown); +} + +static ssize_t ti_dac_write_powerdown(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + bool powerdown; + int ret; + + ret = strtobool(buf, &powerdown); + if (ret) + return ret; + + if (ti_dac->powerdown == powerdown) + return len; + + mutex_lock(&ti_dac->lock); + if (powerdown) + ret = ti_dac_cmd(ti_dac, POWERDOWN(ti_dac->powerdown_mode), 0); + else + ret = ti_dac_cmd(ti_dac, WRITE_AND_UPDATE(0), ti_dac->val[0]); + if (!ret) + ti_dac->powerdown = powerdown; + mutex_unlock(&ti_dac->lock); + + return ret ? ret : len; +} + +static const struct iio_chan_spec_ext_info ti_dac_ext_info[] = { + { + .name = "powerdown", + .read = ti_dac_read_powerdown, + .write = ti_dac_write_powerdown, + .shared = IIO_SHARED_BY_TYPE, + }, + IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &ti_dac_powerdown_mode), + IIO_ENUM_AVAILABLE("powerdown_mode", &ti_dac_powerdown_mode), + { }, +}; + +#define TI_DAC_CHANNEL(chan) { \ + .type = IIO_VOLTAGE, \ + .channel = (chan), \ + .address = (chan), \ + .indexed = true, \ + .output = true, \ + .datasheet_name = (const char[]){ 'A' + (chan), 0 }, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .ext_info = ti_dac_ext_info, \ +} + +static const struct iio_chan_spec ti_dac_channels[] = { + TI_DAC_CHANNEL(0), + TI_DAC_CHANNEL(1), + TI_DAC_CHANNEL(2), + TI_DAC_CHANNEL(3), +}; + +static int ti_dac_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + *val = ti_dac->val[chan->channel]; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SCALE: + ret = regulator_get_voltage(ti_dac->vref); + if (ret < 0) + return ret; + + *val = ret / 1000; + *val2 = ti_dac->resolution; + ret = IIO_VAL_FRACTIONAL_LOG2; + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static int ti_dac_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (ti_dac->val[chan->channel] == val) + return 0; + + if (val >= (1 << ti_dac->resolution) || val < 0) + return -EINVAL; + + if (ti_dac->powerdown) + return -EBUSY; + + mutex_lock(&ti_dac->lock); + ret = ti_dac_cmd(ti_dac, WRITE_AND_UPDATE(chan->channel), val); + if (!ret) + ti_dac->val[chan->channel] = val; + mutex_unlock(&ti_dac->lock); + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static int ti_dac_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, long mask) +{ + return IIO_VAL_INT; +} + +static const struct iio_info ti_dac_info = { + .read_raw = ti_dac_read_raw, + .write_raw = ti_dac_write_raw, + .write_raw_get_fmt = ti_dac_write_raw_get_fmt, +}; + +static int ti_dac_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ti_dac_chip *ti_dac; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*ti_dac)); + if (!indio_dev) + return -ENOMEM; + + indio_dev->dev.parent = dev; + indio_dev->info = &ti_dac_info; + indio_dev->name = spi->modalias; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ti_dac_channels; + spi_set_drvdata(spi, indio_dev); + + ti_dac = iio_priv(indio_dev); + ti_dac->xfer.tx_buf = &ti_dac->buf; + ti_dac->xfer.len = sizeof(ti_dac->buf); + spi_message_init_with_transfers(&ti_dac->mesg, &ti_dac->xfer, 1); + ti_dac->mesg.spi = spi; + + ret = sscanf(spi->modalias, "dac%2hhu%1d", + &ti_dac->resolution, &indio_dev->num_channels); + WARN_ON(ret != 2); + + ti_dac->vref = devm_regulator_get(dev, "vref"); + if (IS_ERR(ti_dac->vref)) + return PTR_ERR(ti_dac->vref); + + ret = regulator_enable(ti_dac->vref); + if (ret < 0) + return ret; + + mutex_init(&ti_dac->lock); + + ret = ti_dac_cmd(ti_dac, WRITE_ALL_UPDATE, 0); + if (ret) { + dev_err(dev, "failed to initialize outputs to 0\n"); + goto err; + } + + ret = iio_device_register(indio_dev); + if (ret) + goto err; + + return 0; + +err: + mutex_destroy(&ti_dac->lock); + regulator_disable(ti_dac->vref); + return ret; +} + +static int ti_dac_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ti_dac_chip *ti_dac = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + mutex_destroy(&ti_dac->lock); + regulator_disable(ti_dac->vref); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id ti_dac_of_id[] = { + { .compatible = "ti,dac082s085" }, + { .compatible = "ti,dac102s085" }, + { .compatible = "ti,dac122s085" }, + { .compatible = "ti,dac084s085" }, + { .compatible = "ti,dac104s085" }, + { .compatible = "ti,dac124s085" }, + { } +}; +MODULE_DEVICE_TABLE(of, ti_dac_of_id); +#endif + +static const struct spi_device_id ti_dac_spi_id[] = { + { "dac082s085" }, + { "dac102s085" }, + { "dac122s085" }, + { "dac084s085" }, + { "dac104s085" }, + { "dac124s085" }, + { } +}; +MODULE_DEVICE_TABLE(spi, ti_dac_spi_id); + +static struct spi_driver ti_dac_driver = { + .driver = { + .name = "ti-dac082s085", + .of_match_table = of_match_ptr(ti_dac_of_id), + }, + .probe = ti_dac_probe, + .remove = ti_dac_remove, + .id_table = ti_dac_spi_id, +}; +module_spi_driver(ti_dac_driver); + +MODULE_AUTHOR("Lukas Wunner "); +MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 2/4-channel DAC driver"); +MODULE_LICENSE("GPL v2");