diff options
Diffstat (limited to 'drivers/iio/adc')
48 files changed, 470 insertions, 341 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index f96a7702b020..7e3286265a38 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1085,7 +1085,6 @@ config VIPERBOARD_ADC config XILINX_XADC tristate "Xilinx XADC driver" - depends on ARCH_ZYNQ || MICROBLAZE || COMPILE_TEST depends on HAS_IOMEM select IIO_BUFFER select IIO_TRIGGERED_BUFFER diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c index 659ef37d5fe8..edc6f1cc90b2 100644 --- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -61,6 +61,8 @@ #define AD7124_CONFIG_REF_SEL(x) FIELD_PREP(AD7124_CONFIG_REF_SEL_MSK, x) #define AD7124_CONFIG_PGA_MSK GENMASK(2, 0) #define AD7124_CONFIG_PGA(x) FIELD_PREP(AD7124_CONFIG_PGA_MSK, x) +#define AD7124_CONFIG_IN_BUFF_MSK GENMASK(7, 6) +#define AD7124_CONFIG_IN_BUFF(x) FIELD_PREP(AD7124_CONFIG_IN_BUFF_MSK, x) /* AD7124_FILTER_X */ #define AD7124_FILTER_FS_MSK GENMASK(10, 0) @@ -108,6 +110,8 @@ struct ad7124_chip_info { struct ad7124_channel_config { enum ad7124_ref_sel refsel; bool bipolar; + bool buf_positive; + bool buf_negative; unsigned int ain; unsigned int vref_mv; unsigned int pga_bits; @@ -117,7 +121,7 @@ struct ad7124_channel_config { struct ad7124_state { const struct ad7124_chip_info *chip_info; struct ad_sigma_delta sd; - struct ad7124_channel_config channel_config[4]; + struct ad7124_channel_config *channel_config; struct regulator *vref[4]; struct clk *mclk; unsigned int adc_control; @@ -435,6 +439,7 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev, struct ad7124_state *st = iio_priv(indio_dev); struct device_node *child; struct iio_chan_spec *chan; + struct ad7124_channel_config *chan_config; unsigned int ain[2], channel = 0, tmp; int ret; @@ -449,8 +454,14 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev, if (!chan) return -ENOMEM; + chan_config = devm_kcalloc(indio_dev->dev.parent, st->num_channels, + sizeof(*chan_config), GFP_KERNEL); + if (!chan_config) + return -ENOMEM; + indio_dev->channels = chan; indio_dev->num_channels = st->num_channels; + st->channel_config = chan_config; for_each_available_child_of_node(np, child) { ret = of_property_read_u32(child, "reg", &channel); @@ -462,13 +473,6 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev, if (ret) goto err; - if (ain[0] >= st->chip_info->num_inputs || - ain[1] >= st->chip_info->num_inputs) { - dev_err(indio_dev->dev.parent, - "Input pin number out of range.\n"); - ret = -EINVAL; - goto err; - } st->channel_config[channel].ain = AD7124_CHANNEL_AINP(ain[0]) | AD7124_CHANNEL_AINM(ain[1]); st->channel_config[channel].bipolar = @@ -480,6 +484,11 @@ static int ad7124_of_parse_channel_config(struct iio_dev *indio_dev, else st->channel_config[channel].refsel = tmp; + st->channel_config[channel].buf_positive = + of_property_read_bool(child, "adi,buffered-positive"); + st->channel_config[channel].buf_negative = + of_property_read_bool(child, "adi,buffered-negative"); + *chan = ad7124_channel_template; chan->address = channel; chan->scan_index = channel; @@ -499,7 +508,7 @@ err: static int ad7124_setup(struct ad7124_state *st) { unsigned int val, fclk, power_mode; - int i, ret; + int i, ret, tmp; fclk = clk_get_rate(st->mclk); if (!fclk) @@ -532,8 +541,12 @@ static int ad7124_setup(struct ad7124_state *st) if (ret < 0) return ret; + tmp = (st->channel_config[i].buf_positive << 1) + + st->channel_config[i].buf_negative; + val = AD7124_CONFIG_BIPOLAR(st->channel_config[i].bipolar) | - AD7124_CONFIG_REF_SEL(st->channel_config[i].refsel); + AD7124_CONFIG_REF_SEL(st->channel_config[i].refsel) | + AD7124_CONFIG_IN_BUFF(tmp); ret = ad_sd_write_reg(&st->sd, AD7124_CONFIG(i), 2, val); if (ret < 0) return ret; diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index 24c70c3cefb4..aba0fd123a51 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -140,7 +140,7 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, int *val2, long m) { - int ret; + int ret, ch = 0; struct ad7606_state *st = iio_priv(indio_dev); switch (m) { @@ -157,8 +157,10 @@ static int ad7606_read_raw(struct iio_dev *indio_dev, *val = (short)ret; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: + if (st->sw_mode_en) + ch = chan->address; *val = 0; - *val2 = st->scale_avail[st->range]; + *val2 = st->scale_avail[st->range[ch]]; return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *val = st->oversampling; @@ -194,6 +196,32 @@ static ssize_t in_voltage_scale_available_show(struct device *dev, static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0); +static int ad7606_write_scale_hw(struct iio_dev *indio_dev, int ch, int val) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + gpiod_set_value(st->gpio_range, val); + + return 0; +} + +static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val) +{ + struct ad7606_state *st = iio_priv(indio_dev); + DECLARE_BITMAP(values, 3); + + values[0] = val; + + gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc, + st->gpio_os->info, values); + + /* AD7616 requires a reset to update value */ + if (st->chip_info->os_req_reset) + ad7606_reset(st); + + return 0; +} + static int ad7606_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, @@ -201,15 +229,20 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, long mask) { struct ad7606_state *st = iio_priv(indio_dev); - DECLARE_BITMAP(values, 3); - int i; + int i, ret, ch = 0; switch (mask) { case IIO_CHAN_INFO_SCALE: mutex_lock(&st->lock); i = find_closest(val2, st->scale_avail, st->num_scales); - gpiod_set_value(st->gpio_range, i); - st->range = i; + if (st->sw_mode_en) + ch = chan->address; + ret = st->write_scale(indio_dev, ch, i); + if (ret < 0) { + mutex_unlock(&st->lock); + return ret; + } + st->range[ch] = i; mutex_unlock(&st->lock); return 0; @@ -218,17 +251,12 @@ static int ad7606_write_raw(struct iio_dev *indio_dev, return -EINVAL; i = find_closest(val, st->oversampling_avail, st->num_os_ratios); - - values[0] = i; - mutex_lock(&st->lock); - gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc, - st->gpio_os->info, values); - - /* AD7616 requires a reset to update value */ - if (st->chip_info->os_req_reset) - ad7606_reset(st); - + ret = st->write_os(indio_dev, i); + if (ret < 0) { + mutex_unlock(&st->lock); + return ret; + } st->oversampling = st->oversampling_avail[i]; mutex_unlock(&st->lock); @@ -536,7 +564,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, st->bops = bops; st->base_address = base_address; /* tied to logic low, analog input range is +/- 5V */ - st->range = 0; + st->range[0] = 0; st->oversampling = 1; st->scale_avail = ad7606_scale_avail; st->num_scales = ARRAY_SIZE(ad7606_scale_avail); @@ -589,6 +617,39 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address, if (ret) dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n"); + st->write_scale = ad7606_write_scale_hw; + st->write_os = ad7606_write_os_hw; + + if (st->chip_info->sw_mode_config) + st->sw_mode_en = device_property_present(st->dev, + "adi,sw-mode"); + + if (st->sw_mode_en) { + /* After reset, in software mode, ±10 V is set by default */ + memset32(st->range, 2, ARRAY_SIZE(st->range)); + indio_dev->info = &ad7606_info_os_and_range; + + /* + * In software mode, the range gpio has no longer its function. + * Instead, the scale can be configured individually for each + * channel from the range registers. + */ + if (st->chip_info->write_scale_sw) + st->write_scale = st->chip_info->write_scale_sw; + + /* + * In software mode, the oversampling is no longer configured + * with GPIO pins. Instead, the oversampling can be configured + * in configuratiion register. + */ + if (st->chip_info->write_os_sw) + st->write_os = st->chip_info->write_os_sw; + + ret = st->chip_info->sw_mode_config(indio_dev); + if (ret < 0) + return ret; + } + st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name, indio_dev->id); if (!st->trig) @@ -643,7 +704,7 @@ static int ad7606_resume(struct device *dev) struct ad7606_state *st = iio_priv(indio_dev); if (st->gpio_standby) { - gpiod_set_value(st->gpio_range, st->range); + gpiod_set_value(st->gpio_range, st->range[0]); gpiod_set_value(st->gpio_standby, 1); ad7606_reset(st); } diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h index f9ef52131e74..d8a509c2c428 100644 --- a/drivers/iio/adc/ad7606.h +++ b/drivers/iio/adc/ad7606.h @@ -16,6 +16,12 @@ * oversampling ratios. * @oversampling_num number of elements stored in oversampling_avail array * @os_req_reset some devices require a reset to update oversampling + * @write_scale_sw pointer to the function which writes the scale via spi + in software mode + * @write_os_sw pointer to the function which writes the os via spi + in software mode + * @sw_mode_config: pointer to a function which configured the device + * for software mode */ struct ad7606_chip_info { const struct iio_chan_spec *channels; @@ -23,6 +29,9 @@ struct ad7606_chip_info { const unsigned int *oversampling_avail; unsigned int oversampling_num; bool os_req_reset; + int (*write_scale_sw)(struct iio_dev *indio_dev, int ch, int val); + int (*write_os_sw)(struct iio_dev *indio_dev, int val); + int (*sw_mode_config)(struct iio_dev *indio_dev); }; /** @@ -34,11 +43,14 @@ struct ad7606_chip_info { * @range voltage range selection, selects which scale to apply * @oversampling oversampling selection * @base_address address from where to read data in parallel operation + * @sw_mode_en software mode enabled * @scale_avail pointer to the array which stores the available scales * @num_scales number of elements stored in the scale_avail array * @oversampling_avail pointer to the array which stores the available * oversampling ratios. * @num_os_ratios number of elements stored in oversampling_avail array + * @write_scale pointer to the function which writes the scale + * @write_os pointer to the function which writes the os * @lock protect sensor state from concurrent accesses to GPIOs * @gpio_convst GPIO descriptor for conversion start signal (CONVST) * @gpio_reset GPIO descriptor for device hard-reset @@ -57,13 +69,16 @@ struct ad7606_state { const struct ad7606_chip_info *chip_info; struct regulator *reg; const struct ad7606_bus_ops *bops; - unsigned int range; + unsigned int range[16]; unsigned int oversampling; void __iomem *base_address; + bool sw_mode_en; const unsigned int *scale_avail; unsigned int num_scales; const unsigned int *oversampling_avail; unsigned int num_os_ratios; + int (*write_scale)(struct iio_dev *indio_dev, int ch, int val); + int (*write_os)(struct iio_dev *indio_dev, int val); struct mutex lock; /* protect sensor state */ struct gpio_desc *gpio_convst; diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c index 7a5b5d00a87d..5a3ca5904ded 100644 --- a/drivers/iio/adc/ad799x.c +++ b/drivers/iio/adc/ad799x.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * iio/adc/ad799x.c * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc. @@ -11,15 +12,10 @@ * based on linux/drivers/acron/char/pcf8583.c * Copyright (C) 2000 Russell King * - * 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. - * * ad799x.c * * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, * ad7998 and similar chips. - * */ #include <linux/interrupt.h> diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c index 1423221c6e06..2640b75fb774 100644 --- a/drivers/iio/adc/ad_sigma_delta.c +++ b/drivers/iio/adc/ad_sigma_delta.c @@ -357,7 +357,7 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev) ret = ad_sigma_delta_set_channel(sigma_delta, indio_dev->channels[channel].address); if (ret) - goto err_predisable; + return ret; spi_bus_lock(sigma_delta->spi->master); sigma_delta->bus_locked = true; @@ -374,7 +374,6 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev) err_unlock: spi_bus_unlock(sigma_delta->spi->master); -err_predisable: return ret; } diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c index 9515ca165dfd..d3fc39df535d 100644 --- a/drivers/iio/adc/aspeed_adc.c +++ b/drivers/iio/adc/aspeed_adc.c @@ -1,12 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Aspeed AST2400/2500 ADC * * Copyright (C) 2017 Google, Inc. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * */ #include <linux/clk.h> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c index d5ea84cf6460..a2837a0e7cba 100644 --- a/drivers/iio/adc/at91-sama5d2_adc.c +++ b/drivers/iio/adc/at91-sama5d2_adc.c @@ -1,17 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Atmel ADC driver for SAMA5D2 devices and compatible. * * Copyright (C) 2015 Atmel, * 2015 Ludovic Desroches <ludovic.desroches@atmel.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/bitops.h> @@ -1586,8 +1578,7 @@ static void at91_adc_hw_init(struct at91_adc_state *st) static ssize_t at91_adc_get_fifo_state(struct device *dev, struct device_attribute *attr, char *buf) { - struct iio_dev *indio_dev = - platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *indio_dev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(indio_dev); return scnprintf(buf, PAGE_SIZE, "%d\n", !!st->dma_st.dma_chan); @@ -1596,8 +1587,7 @@ static ssize_t at91_adc_get_fifo_state(struct device *dev, static ssize_t at91_adc_get_watermark(struct device *dev, struct device_attribute *attr, char *buf) { - struct iio_dev *indio_dev = - platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *indio_dev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(indio_dev); return scnprintf(buf, PAGE_SIZE, "%d\n", st->dma_st.watermark); @@ -1849,8 +1839,7 @@ static int at91_adc_remove(struct platform_device *pdev) static __maybe_unused int at91_adc_suspend(struct device *dev) { - struct iio_dev *indio_dev = - platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *indio_dev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(indio_dev); /* @@ -1870,8 +1859,7 @@ static __maybe_unused int at91_adc_suspend(struct device *dev) static __maybe_unused int at91_adc_resume(struct device *dev) { - struct iio_dev *indio_dev = - platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *indio_dev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(indio_dev); int ret; diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index d23709ed9049..32f1c4a33b20 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -1359,7 +1359,7 @@ static int at91_adc_remove(struct platform_device *pdev) #ifdef CONFIG_PM_SLEEP static int at91_adc_suspend(struct device *dev) { - struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *idev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(idev); pinctrl_pm_select_sleep_state(dev); @@ -1370,7 +1370,7 @@ static int at91_adc_suspend(struct device *dev) static int at91_adc_resume(struct device *dev) { - struct iio_dev *idev = platform_get_drvdata(to_platform_device(dev)); + struct iio_dev *idev = dev_get_drvdata(dev); struct at91_adc_state *st = iio_priv(idev); clk_prepare_enable(st->clk); diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c index 5be789269353..88059480da17 100644 --- a/drivers/iio/adc/axp20x_adc.c +++ b/drivers/iio/adc/axp20x_adc.c @@ -1,11 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* ADC driver for AXP20X and AXP22X PMICs * * Copyright (c) 2016 Free Electrons NextThing Co. * Quentin Schulz <quentin.schulz@free-electrons.com> - * - * 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/completion.h> diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c index 4e339cfd0c54..31d51bcc5f2c 100644 --- a/drivers/iio/adc/axp288_adc.c +++ b/drivers/iio/adc/axp288_adc.c @@ -1,19 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver * * Copyright (C) 2014 Intel Corporation * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * */ #include <linux/module.h> diff --git a/drivers/iio/adc/bcm_iproc_adc.c b/drivers/iio/adc/bcm_iproc_adc.c index 7af59a4bbd8d..c46c0aa15376 100644 --- a/drivers/iio/adc/bcm_iproc_adc.c +++ b/drivers/iio/adc/bcm_iproc_adc.c @@ -1,17 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2016 Broadcom - * - * 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 (the "GPL"). - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 (GPLv2) for more details. - * - * You should have received a copy of the GNU General Public License - * version 2 (GPLv2) along with this source code. */ #include <linux/module.h> diff --git a/drivers/iio/adc/cc10001_adc.c b/drivers/iio/adc/cc10001_adc.c index 707d8b24b072..f93f1d93b80d 100644 --- a/drivers/iio/adc/cc10001_adc.c +++ b/drivers/iio/adc/cc10001_adc.c @@ -1,10 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2014-2015 Imagination Technologies Ltd. - * - * 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/clk.h> diff --git a/drivers/iio/adc/dln2-adc.c b/drivers/iio/adc/dln2-adc.c index c64c6675cae6..5fa78c273a25 100644 --- a/drivers/iio/adc/dln2-adc.c +++ b/drivers/iio/adc/dln2-adc.c @@ -1,11 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Diolan DLN-2 USB-ADC adapter * * Copyright (c) 2017 Jack Andersen - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation, version 2. */ #include <linux/kernel.h> diff --git a/drivers/iio/adc/ep93xx_adc.c b/drivers/iio/adc/ep93xx_adc.c index 5036c392cb20..5c97e8a511f2 100644 --- a/drivers/iio/adc/ep93xx_adc.c +++ b/drivers/iio/adc/ep93xx_adc.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Driver for ADC module on the Cirrus Logic EP93xx series of SoCs * * Copyright (C) 2015 Alexander Sverdlin< |