On Sat, 12 Jan 2019 18:42:49 +0000 Jonathan Cameron <[email protected]> wrote:
> On Fri, 11 Jan 2019 13:57:06 -0600 > Dan Murphy <[email protected]> wrote: > > > Introduce the TI ADS124S08 and the ADS124S06 ADC > > devices from TI. The ADS124S08 is the 12 channel ADC > > and the ADS124S06 is the 6 channel ADC device > > > > These devices share a common datasheet: > > http://www.ti.com/lit/gpn/ads124s08 > > > > Signed-off-by: Dan Murphy <[email protected]> > Hi Dan, > > The only real change in here (there is another nitpick) that I think > needs to be made is that the buffer length in the private stucture is > not longer connected to the number of channels. You effectively use it > as a bounce buffer now and I think the maximum is 5. > > As that's it I'll just clean it up whilst applying. If you could > confirm I'm not crazy and didn't mess it up that would be great! Probably would help if I added. Applied to the togreg branch of iio.git but for now just pushed out as testing for the autobuilders to play with it. Thanks, Jonathan > > Thanks, > > Jonathan > > > --- > > v3 - Fixed the IIO channel definition, reduce long line in probe and > > fixed the buffer allocation definition - > > https://lore.kernel.org/patchwork/patch/1023970/ > > > > v2 - Removed the fill_noop call, updated probe to use device managed calls, > > removed regulator support, fixed the buffer to allow 64 bit timestamp, > > changed > > all the defines from S0X to S08, added an enum for the IDs and updated > > copyright > > header format. I may have missed a few summary changes here but here is the > > review reference - https://lore.kernel.org/patchwork/patch/1021048/ > > > > drivers/iio/adc/Kconfig | 10 + > > drivers/iio/adc/Makefile | 1 + > > drivers/iio/adc/ti-ads124s08.c | 375 +++++++++++++++++++++++++++++++++ > > 3 files changed, 386 insertions(+) > > create mode 100644 drivers/iio/adc/ti-ads124s08.c > > > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > > index 7a3ca4ec0cb7..8cf9e007ea76 100644 > > --- a/drivers/iio/adc/Kconfig > > +++ b/drivers/iio/adc/Kconfig > > @@ -908,6 +908,16 @@ config TI_ADS8688 > > This driver can also be built as a module. If so, the module will be > > called ti-ads8688. > > > > +config TI_ADS124S08 > > + tristate "Texas Instruments ADS124S08" > > + depends on SPI && OF > > + help > > + If you say yes here you get support for Texas Instruments ADS124S08 > > + and ADS124S06 ADC chips > > + > > + This driver can also be built as a module. If so, the module will be > > + called ti-ads124s08. > > + > > config TI_AM335X_ADC > > tristate "TI's AM335X ADC driver" > > depends on MFD_TI_AM335X_TSCADC && HAS_DMA > > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > > index 07df37f621bd..49b203bf4e0e 100644 > > --- a/drivers/iio/adc/Makefile > > +++ b/drivers/iio/adc/Makefile > > @@ -81,6 +81,7 @@ obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o > > obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o > > obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o > > obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o > > +obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o > > obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o > > obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o > > obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o > > diff --git a/drivers/iio/adc/ti-ads124s08.c b/drivers/iio/adc/ti-ads124s08.c > > new file mode 100644 > > index 000000000000..3d7f2300e0f6 > > --- /dev/null > > +++ b/drivers/iio/adc/ti-ads124s08.c > > @@ -0,0 +1,375 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* TI ADS124S0X chip family driver > > + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/ > > + */ > > + > > +#include <linux/err.h> > > +#include <linux/delay.h> > > +#include <linux/device.h> > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/of.h> > > +#include <linux/of_gpio.h> > > +#include <linux/slab.h> > > +#include <linux/sysfs.h> > > + > > +#include <linux/gpio/consumer.h> > > +#include <linux/spi/spi.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/buffer.h> > > +#include <linux/iio/trigger_consumer.h> > > +#include <linux/iio/triggered_buffer.h> > > +#include <linux/iio/sysfs.h> > > + > > +/* Commands */ > > +#define ADS124S08_CMD_NOP 0x00 > > +#define ADS124S08_CMD_WAKEUP 0x02 > > +#define ADS124S08_CMD_PWRDWN 0x04 > > +#define ADS124S08_CMD_RESET 0x06 > > +#define ADS124S08_CMD_START 0x08 > > +#define ADS124S08_CMD_STOP 0x0a > > +#define ADS124S08_CMD_SYOCAL 0x16 > > +#define ADS124S08_CMD_SYGCAL 0x17 > > +#define ADS124S08_CMD_SFOCAL 0x19 > > +#define ADS124S08_CMD_RDATA 0x12 > > +#define ADS124S08_CMD_RREG 0x20 > > +#define ADS124S08_CMD_WREG 0x40 > > + > > +/* Registers */ > > +#define ADS124S08_ID_REG 0x00 > > +#define ADS124S08_STATUS 0x01 > > +#define ADS124S08_INPUT_MUX 0x02 > > +#define ADS124S08_PGA 0x03 > > +#define ADS124S08_DATA_RATE 0x04 > > +#define ADS124S08_REF 0x05 > > +#define ADS124S08_IDACMAG 0x06 > > +#define ADS124S08_IDACMUX 0x07 > > +#define ADS124S08_VBIAS 0x08 > > +#define ADS124S08_SYS 0x09 > > +#define ADS124S08_OFCAL0 0x0a > > +#define ADS124S08_OFCAL1 0x0b > > +#define ADS124S08_OFCAL2 0x0c > > +#define ADS124S08_FSCAL0 0x0d > > +#define ADS124S08_FSCAL1 0x0e > > +#define ADS124S08_FSCAL2 0x0f > > +#define ADS124S08_GPIODAT 0x10 > > +#define ADS124S08_GPIOCON 0x11 > > + > > +/* ADS124S0x common channels */ > > +#define ADS124S08_AIN0 0x00 > > +#define ADS124S08_AIN1 0x01 > > +#define ADS124S08_AIN2 0x02 > > +#define ADS124S08_AIN3 0x03 > > +#define ADS124S08_AIN4 0x04 > > +#define ADS124S08_AIN5 0x05 > > +#define ADS124S08_AINCOM 0x0c > > +/* ADS124S08 only channels */ > > +#define ADS124S08_AIN6 0x06 > > +#define ADS124S08_AIN7 0x07 > > +#define ADS124S08_AIN8 0x08 > > +#define ADS124S08_AIN9 0x09 > > +#define ADS124S08_AIN10 0x0a > > +#define ADS124S08_AIN11 0x0b > > +#define ADS124S08_MAX_CHANNELS 12 > > + > > +#define ADS124S08_POS_MUX_SHIFT 0x04 > > +#define ADS124S08_INT_REF 0x09 > > + > > +#define ADS124S08_START_REG_MASK 0x1f > > +#define ADS124S08_NUM_BYTES_MASK 0x1f > > + > > +#define ADS124S08_START_CONV 0x01 > > +#define ADS124S08_STOP_CONV 0x00 > > + > > +enum ads124s_id { > > + ADS124S08_ID, > > + ADS124S06_ID, > > +}; > > + > > +struct ads124s_chip_info { > > + const struct iio_chan_spec *channels; > > + unsigned int num_channels; > > +}; > > + > > +struct ads124s_private { > > + const struct ads124s_chip_info *chip_info; > > + struct gpio_desc *reset_gpio; > > + struct spi_device *spi; > > + struct mutex lock; > > + u8 data[ADS124S08_MAX_CHANNELS] ____cacheline_aligned; > > I'm fairly sure this only needs to be 5 not MAX_CHANNELS as you use > another buffer to build up the full set of readouts. > > > +}; > > + > > +#define ADS124S08_CHAN(index) \ > > +{ \ > > + .type = IIO_VOLTAGE, \ > > + .indexed = 1, \ > > + .channel = index, \ > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > > + .scan_index = index, \ > > + .scan_type = { \ > > + .sign = 'u', \ > > + .realbits = 32, \ > > + .storagebits = 32, \ > > + }, \ > > +} > > + > > +static const struct iio_chan_spec ads124s06_channels[] = { > > + ADS124S08_CHAN(0), > > + ADS124S08_CHAN(1), > > + ADS124S08_CHAN(2), > > + ADS124S08_CHAN(3), > > + ADS124S08_CHAN(4), > > + ADS124S08_CHAN(5), > > +}; > > + > > +static const struct iio_chan_spec ads124s08_channels[] = { > > + ADS124S08_CHAN(0), > > + ADS124S08_CHAN(1), > > + ADS124S08_CHAN(2), > > + ADS124S08_CHAN(3), > > + ADS124S08_CHAN(4), > > + ADS124S08_CHAN(5), > > + ADS124S08_CHAN(6), > > + ADS124S08_CHAN(7), > > + ADS124S08_CHAN(8), > > + ADS124S08_CHAN(9), > > + ADS124S08_CHAN(10), > > + ADS124S08_CHAN(11), > > +}; > > + > > +static const struct ads124s_chip_info ads124s_chip_info_tbl[] = { > > + [ADS124S08_ID] = { > > + .channels = ads124s08_channels, > > + .num_channels = ARRAY_SIZE(ads124s08_channels), > > + }, > > + [ADS124S06_ID] = { > > + .channels = ads124s06_channels, > > + .num_channels = ARRAY_SIZE(ads124s06_channels), > > + }, > > +}; > > + > > +static int ads124s_write_cmd(struct iio_dev *indio_dev, u8 command) > > +{ > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + > > + priv->data[0] = command; > > + > > + return spi_write(priv->spi, &priv->data[0], 1); > > +} > > + > > +static int ads124s_write_reg(struct iio_dev *indio_dev, u8 reg, u8 data) > > +{ > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + > > + priv->data[0] = ADS124S08_CMD_WREG | reg; > > + priv->data[1] = 0x0; > > + priv->data[2] = data; > > + > > + return spi_write(priv->spi, &priv->data[0], 3); > > +} > > + > > +static int ads124s_reset(struct iio_dev *indio_dev) > > +{ > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + > > + if (priv->reset_gpio) { > > + gpiod_set_value(priv->reset_gpio, 0); > > + udelay(200); > > + gpiod_set_value(priv->reset_gpio, 1); > > + } else { > > + return ads124s_write_cmd(indio_dev, ADS124S08_CMD_RESET); > > + } > > + > > + return 0; > > +}; > > + > > +static int ads124s_read(struct iio_dev *indio_dev, unsigned int chan) > > +{ > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + int ret; > > + u32 tmp; > > + struct spi_transfer t[] = { > > + { > > + .tx_buf = &priv->data[0], > > + .len = 4, > > + .cs_change = 1, > > + }, { > > + .tx_buf = &priv->data[1], > > + .rx_buf = &priv->data[1], > > + .len = 4, > > + }, > > + }; > > + > > + priv->data[0] = ADS124S08_CMD_RDATA; > > + memset(&priv->data[1], ADS124S08_CMD_NOP, sizeof(priv->data)); > > + > > + ret = spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t)); > > + if (ret < 0) > > + return ret; > > + > > + tmp = priv->data[2] << 16 | priv->data[3] << 8 | priv->data[4]; > > + > > + return tmp; > > +} > > + > > +static int ads124s_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, > > + int *val, int *val2, long m) > > +{ > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + int ret; > > + > > + mutex_lock(&priv->lock); > > + switch (m) { > > + case IIO_CHAN_INFO_RAW: > > + ret = ads124s_write_reg(indio_dev, ADS124S08_INPUT_MUX, > > + chan->channel); > > + if (ret) { > > + dev_err(&priv->spi->dev, "Set ADC CH failed\n"); > > + goto out; > > + } > > + > > + ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV); > > + if (ret) { > > + dev_err(&priv->spi->dev, "Start converions failed\n"); > > + goto out; > > + } > > + > > + ret = ads124s_read(indio_dev, chan->channel); > > + if (ret < 0) { > > + dev_err(&priv->spi->dev, "Read ADC failed\n"); > > + goto out; > > + } else > > + *val = ret; > Nit pick is that this doesn't benefit from being an else as it's just the > normal > flow. Trivial though so lets just leave it! > > > + > > + ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV); > > + if (ret) { > > + dev_err(&priv->spi->dev, "Stop converions failed\n"); > > + goto out; > > + } > > + > > + ret = IIO_VAL_INT; > > + break; > > + default: > > + ret = -EINVAL; > > + break; > > + } > > +out: > > + mutex_unlock(&priv->lock); > > + return ret; > > +} > > + > > +static const struct iio_info ads124s_info = { > > + .read_raw = &ads124s_read_raw, > > +}; > > + > > +static irqreturn_t ads124s_trigger_handler(int irq, void *p) > > +{ > > + struct iio_poll_func *pf = p; > > + struct iio_dev *indio_dev = pf->indio_dev; > > + struct ads124s_private *priv = iio_priv(indio_dev); > > + u32 buffer[ADS124S08_MAX_CHANNELS + sizeof(s64)/sizeof(u16)]; > > + int scan_index, j = 0; > > + int ret; > > + > > + for_each_set_bit(scan_index, indio_dev->active_scan_mask, > > + indio_dev->masklength) { > > + ret = ads124s_write_reg(indio_dev, ADS124S08_INPUT_MUX, > > + scan_index); > > + if (ret) > > + dev_err(&priv->spi->dev, "Set ADC CH failed\n"); > > + > > + ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV); > > + if (ret) > > + dev_err(&priv->spi->dev, "Start ADC converions > > failed\n"); > > + > > + buffer[j] = ads124s_read(indio_dev, scan_index); > > + ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV); > > + if (ret) > > + dev_err(&priv->spi->dev, "Stop ADC converions > > failed\n"); > > + > > + j++; > > + } > > + > > + iio_push_to_buffers_with_timestamp(indio_dev, buffer, > > + pf->timestamp); > > + > > + iio_trigger_notify_done(indio_dev->trig); > > + > > + return IRQ_HANDLED; > > +} > > + > > +static int ads124s_probe(struct spi_device *spi) > > +{ > > + struct ads124s_private *ads124s_priv; > > + struct iio_dev *indio_dev; > > + const struct spi_device_id *spi_id = spi_get_device_id(spi); > > + int ret; > > + > > + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*ads124s_priv)); > > + if (indio_dev == NULL) > > + return -ENOMEM; > > + > > + ads124s_priv = iio_priv(indio_dev); > > + > > + ads124s_priv->reset_gpio = devm_gpiod_get_optional(&spi->dev, > > + "reset", GPIOD_OUT_LOW); > > + if (IS_ERR(ads124s_priv->reset_gpio)) > > + dev_info(&spi->dev, "Reset GPIO not defined\n"); > > + > > + ads124s_priv->chip_info = &ads124s_chip_info_tbl[spi_id->driver_data]; > > + > > + spi_set_drvdata(spi, indio_dev); > > + > > + ads124s_priv->spi = spi; > > + > > + indio_dev->name = spi_id->name; > > + indio_dev->dev.parent = &spi->dev; > > + indio_dev->dev.of_node = spi->dev.of_node; > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + indio_dev->channels = ads124s_priv->chip_info->channels; > > + indio_dev->num_channels = ads124s_priv->chip_info->num_channels; > > + indio_dev->info = &ads124s_info; > > + > > + mutex_init(&ads124s_priv->lock); > > + > > + ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL, > > + ads124s_trigger_handler, NULL); > > + if (ret) { > > + dev_err(&spi->dev, "iio triggered buffer setup failed\n"); > > + return ret; > > + } > > + > > + ads124s_reset(indio_dev); > > + > > + return devm_iio_device_register(&spi->dev, indio_dev); > > +} > > + > > +static const struct spi_device_id ads124s_id[] = { > > + { "ads124s06", ADS124S06_ID }, > > + { "ads124s08", ADS124S08_ID }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(spi, ads124s_id); > > + > > +static const struct of_device_id ads124s_of_table[] = { > > + { .compatible = "ti,ads124s06" }, > > + { .compatible = "ti,ads124s08" }, > > + { }, > > +}; > > +MODULE_DEVICE_TABLE(of, ads124s_of_table); > > + > > +static struct spi_driver ads124s_driver = { > > + .driver = { > > + .name = "ads124s08", > > + .of_match_table = ads124s_of_table, > > + }, > > + .probe = ads124s_probe, > > + .id_table = ads124s_id, > > +}; > > +module_spi_driver(ads124s_driver); > > + > > +MODULE_AUTHOR("Dan Murphy <[email protected]>"); > > +MODULE_DESCRIPTION("TI TI_ADS12S0X ADC"); > > +MODULE_LICENSE("GPL v2"); >
