On 14/01/17 17:44, Martin Blumenstingl wrote: > Hi Jonathan, > > thank you for the review! > (further comments from me inline) > I think I'll send an updated version on Monday. > > On Sat, Jan 14, 2017 at 3:46 PM, Jonathan Cameron <jic23@xxxxxxxxxx> wrote: >> On 11/01/17 17:43, Martin Blumenstingl wrote: >>> This adds support for the SAR (Successive Approximation Register) ADC >>> on the Amlogic Meson SoCs. >>> >>> The code is based on the public S805 (Meson8b) and S905 (GXBB) >>> datasheets, as well as by reading (various versions of) the vendor >>> driver and by inspecting the registers on the vendor kernels of my >>> testing-hardware. >>> >>> Currently the GXBB, GXL and GXM SoCs are supported. GXBB hardware has >>> 10-bit ADC resolution, while GXL and GXM have 12-bit ADC resolution. >>> The code was written to support older SoCs (Meson8 and Meson8b) as well, >>> but due to lack of actual testing-hardware no of_device_id was added for >>> these. >>> >>> Two "features" from the vendor driver are currently missing: >>> - the vendor driver uses channel #7 for calibration (this improves the >>> accuracy of the results - in my tests the results were less than 3% >>> off without calibration compared to the vendor driver). Adding support >>> for this should be easy, but is not required for most applications. >>> - channel #6 is connected to the SoCs internal temperature sensor. >>> Adding support for this is probably not so easy since (based on the >>> u-boot sources) most SoC versions are using different registers and >>> algorithms for the conversion from "ADC value" to temperature. >>> >>> Supported by the hardware but currently not supported by the driver: >>> - reading multiple channels at the same time (the hardware has a FIFO >>> buffer which stores multiple results) >>> - continuous sampling (this would require a way to enable this >>> individually because otherwise the ADC would be drawing power >>> constantly) >>> - interrupt support (similar to the vendor driver this new driver is >>> polling the results. It is unclear if the IRQ-mode is supported on >>> older (Meson6 or Meson8) hardware as well or if there are any errata) >>> >> Russell Cc'd for a quick question on the clk api. > a quick side-note the clk API: my driver is a clock consumer and > provider at the same time. This seems to be a recurring pattern in > Amlogic hardware designs (as the MMC and DWMAC glue drivers are doing > this also), see [0] > >> Ideally include a source for datasheets if available. Saves time googling and >> perhaps getting the wrong thing! > OK, will do this in v2 > >> A few other minor comments inline. Pretty good V1. > thanks :-) > >> Jonathan >>> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> >>> --- >>> drivers/iio/adc/Kconfig | 12 + >>> drivers/iio/adc/Makefile | 1 + >>> drivers/iio/adc/meson_saradc.c | 860 +++++++++++++++++++++++++++++++++++++++++ >>> 3 files changed, 873 insertions(+) >>> create mode 100644 drivers/iio/adc/meson_saradc.c >>> >>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig >>> index 9c8b558ba19e..86059b9b91bf 100644 >>> --- a/drivers/iio/adc/Kconfig >>> +++ b/drivers/iio/adc/Kconfig >>> @@ -371,6 +371,18 @@ config MEN_Z188_ADC >>> This driver can also be built as a module. If so, the module will be >>> called men_z188_adc. >>> >>> +config MESON_SARADC >>> + tristate "Amlogic Meson SAR ADC driver" >>> + default ARCH_MESON >>> + depends on OF && COMMON_CLK && (ARCH_MESON || COMPILE_TEST) >>> + select REGMAP_MMIO >>> + help >>> + Say yes here to build support for the SAR ADC found in Amlogic Meson >>> + SoCs. >>> + >>> + To compile this driver as a module, choose M here: the >>> + module will be called meson_saradc. >>> + >>> config MXS_LRADC >>> tristate "Freescale i.MX23/i.MX28 LRADC" >>> depends on (ARCH_MXS || COMPILE_TEST) && HAS_IOMEM >>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile >>> index d36c4be8d1fc..de05b9e75f8f 100644 >>> --- a/drivers/iio/adc/Makefile >>> +++ b/drivers/iio/adc/Makefile >>> @@ -36,6 +36,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o >>> obj-$(CONFIG_MCP3422) += mcp3422.o >>> obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o >>> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o >>> +obj-$(CONFIG_MESON_SARADC) += meson_saradc.o >>> obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o >>> obj-$(CONFIG_NAU7802) += nau7802.o >>> obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o >>> diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c >>> new file mode 100644 >>> index 000000000000..06e8ac620385 >>> --- /dev/null >>> +++ b/drivers/iio/adc/meson_saradc.c >>> @@ -0,0 +1,860 @@ >>> +/* >>> + * Amlogic Meson Successive Approximation Register (SAR) A/D Converter >>> + * >>> + * Copyright (C) 2017 Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> >>> + * >>> + * 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. >>> + * >>> + * You should have received a copy of the GNU General Public License >>> + * along with this program. If not, see <http://www.gnu.org/licenses/>. >>> + */ >>> + >>> +#include <linux/bitfield.h> >>> +#include <linux/clk-provider.h> >>> +#include <linux/module.h> >>> +#include <linux/platform_device.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/io.h> >>> +#include <linux/iio/iio.h> >>> +#include <linux/of.h> >>> +#include <linux/of_device.h> >>> +#include <linux/clk.h> >>> +#include <linux/completion.h> >>> +#include <linux/delay.h> >>> +#include <linux/reset.h> >>> +#include <linux/regmap.h> >>> +#include <linux/regulator/consumer.h> >>> + >>> +#define SAR_ADC_REG0 0x00 >>> + #define SAR_ADC_REG0_PANEL_DETECT BIT(31) >>> + #define SAR_ADC_REG0_BUSY_MASK GENMASK(30, 28) >>> + #define SAR_ADC_REG0_DELTA_BUSY BIT(30) >>> + #define SAR_ADC_REG0_AVG_BUSY BIT(29) >>> + #define SAR_ADC_REG0_SAMPLE_BUSY BIT(28) >>> + #define SAR_ADC_REG0_FIFO_FULL BIT(27) >>> + #define SAR_ADC_REG0_FIFO_EMPTY BIT(26) >>> + #define SAR_ADC_REG0_FIFO_COUNT_MASK GENMASK(25, 21) >>> + #define SAR_ADC_REG0_ADC_BIAS_CTRL_MASK GENMASK(20, 19) >>> + #define SAR_ADC_REG0_CURR_CHAN_ID_MASK GENMASK(18, 16) >>> + #define SAR_ADC_REG0_ADC_TEMP_SEN_SEL BIT(15) >>> + #define SAR_ADC_REG0_SAMPLING_STOP BIT(14) >>> + #define SAR_ADC_REG0_CHAN_DELTA_EN_MASK GENMASK(13, 12) >>> + #define SAR_ADC_REG0_DETECT_IRQ_POL BIT(10) >>> + #define SAR_ADC_REG0_DETECT_IRQ_EN BIT(9) >>> + #define SAR_ADC_REG0_FIFO_CNT_IRQ_MASK GENMASK(8, 4) >>> + #define SAR_ADC_REG0_FIFO_IRQ_EN BIT(3) >>> + #define SAR_ADC_REG0_SAMPLING_START BIT(2) >>> + #define SAR_ADC_REG0_CONTINUOUS_EN BIT(1) >>> + #define SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE BIT(0) >>> + >>> +#define SAR_ADC_CHAN_LIST 0x04 >>> + #define SAR_ADC_CHAN_LIST_MAX_INDEX_MASK GENMASK(26, 24) >>> + #define SAR_ADC_CHAN_CHAN_ENTRY_MASK(_chan) \ >>> + (GENMASK(2, 0) << (_chan * 3)) >>> + >>> +#define SAR_ADC_AVG_CNTL 0x08 >>> + #define SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(_chan) \ >>> + (16 + (_chan * 2)) >>> + #define SAR_ADC_AVG_CNTL_AVG_MODE_MASK(_chan) \ >>> + (GENMASK(17, 16) << (_chan * 2)) >>> + #define SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(_chan) \ >>> + (0 + (_chan * 2)) >>> + #define SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(_chan) \ >>> + (GENMASK(1, 0) << (_chan * 2)) >>> + >>> +#define SAR_ADC_REG3 0x0c >>> + #define SAR_ADC_REG3_CNTL_USE_SC_DLY BIT(31) >>> + #define SAR_ADC_REG3_CLK_EN BIT(30) >>> + #define SAR_ADC_REG3_BL30_INITIALIZED BIT(28) >>> + #define SAR_ADC_REG3_CTRL_CONT_RING_COUNTER_EN BIT(27) >>> + #define SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE BIT(26) >>> + #define SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK GENMASK(25, 23) >>> + #define SAR_ADC_REG3_DETECT_EN BIT(22) >>> + #define SAR_ADC_REG3_ADC_EN BIT(21) >>> + #define SAR_ADC_REG3_PANEL_DETECT_COUNT_MASK GENMASK(20, 18) >>> + #define SAR_ADC_REG3_PANEL_DETECT_FILTER_TB_MASK GENMASK(17, 16) >>> + #define SAR_ADC_REG3_ADC_CLK_DIV_SHIFT 10 >>> + #define SAR_ADC_REG3_ADC_CLK_DIV_WIDTH 5 >>> + #define SAR_ADC_REG3_ADC_CLK_DIV_MASK GENMASK(15, 10) >>> + #define SAR_ADC_REG3_BLOCK_DLY_SEL_MASK GENMASK(9, 8) >>> + #define SAR_ADC_REG3_BLOCK_DLY_MASK GENMASK(7, 0) >>> + >>> +#define SAR_ADC_DELAY 0x10 >>> + #define SAR_ADC_DELAY_INPUT_DLY_SEL_MASK GENMASK(25, 24) >>> + #define SAR_ADC_DELAY_BL30_BUSY BIT(15) >>> + #define SAR_ADC_DELAY_KERNEL_BUSY BIT(14) >>> + #define SAR_ADC_DELAY_INPUT_DLY_CNT_MASK GENMASK(23, 16) >>> + #define SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK GENMASK(9, 8) >>> + #define SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK GENMASK(7, 0) >>> + >>> +#define SAR_ADC_LAST_RD 0x14 >>> + #define SAR_ADC_LAST_RD_LAST_CHANNEL1_MASK GENMASK(23, 16) >>> + #define SAR_ADC_LAST_RD_LAST_CHANNEL0_MASK GENMASK(9, 0) >>> + >>> +#define SAR_ADC_FIFO_RD 0x18 >>> + #define SAR_ADC_FIFO_RD_CHAN_ID_MASK GENMASK(14, 12) >>> + #define SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK GENMASK(11, 0) >>> + >>> +#define SAR_ADC_AUX_SW 0x1c >>> + #define SAR_ADC_AUX_SW_MUX_SEL_CHAN_MASK(_chan) \ >>> + (GENMASK(10, 8) << ((_chan - 2) * 2)) >>> + #define SAR_ADC_AUX_SW_VREF_P_MUX BIT(6) >>> + #define SAR_ADC_AUX_SW_VREF_N_MUX BIT(5) >>> + #define SAR_ADC_AUX_SW_MODE_SEL BIT(4) >>> + #define SAR_ADC_AUX_SW_YP_DRIVE_SW BIT(3) >>> + #define SAR_ADC_AUX_SW_XP_DRIVE_SW BIT(2) >>> + #define SAR_ADC_AUX_SW_YM_DRIVE_SW BIT(1) >>> + #define SAR_ADC_AUX_SW_XM_DRIVE_SW BIT(0) >>> + >>> +#define SAR_ADC_CHAN_10_SW 0x20 >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_MUX_SEL_MASK GENMASK(25, 23) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_VREF_P_MUX BIT(22) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_VREF_N_MUX BIT(21) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_MODE_SEL BIT(20) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_YP_DRIVE_SW BIT(19) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_XP_DRIVE_SW BIT(18) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_YM_DRIVE_SW BIT(17) >>> + #define SAR_ADC_CHAN_10_SW_CHAN1_XM_DRIVE_SW BIT(16) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_MUX_SEL_MASK GENMASK(9, 7) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_VREF_P_MUX BIT(6) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_VREF_N_MUX BIT(5) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_MODE_SEL BIT(4) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_YP_DRIVE_SW BIT(3) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_XP_DRIVE_SW BIT(2) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_YM_DRIVE_SW BIT(1) >>> + #define SAR_ADC_CHAN_10_SW_CHAN0_XM_DRIVE_SW BIT(0) >>> + >>> +#define SAR_ADC_DETECT_IDLE_SW 0x24 >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_SW_EN BIT(26) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_MUX_MASK GENMASK(25, 23) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_VREF_P_MUX BIT(22) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_VREF_N_MUX BIT(21) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_SEL BIT(20) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_YP_DRIVE_SW BIT(19) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_XP_DRIVE_SW BIT(18) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_YM_DRIVE_SW BIT(17) >>> + #define SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_XM_DRIVE_SW BIT(16) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_MUX_SEL_MASK GENMASK(9, 7) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_VREF_P_MUX BIT(6) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_VREF_N_MUX BIT(5) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_SEL BIT(4) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_YP_DRIVE_SW BIT(3) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_XP_DRIVE_SW BIT(2) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_YM_DRIVE_SW BIT(1) >>> + #define SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_XM_DRIVE_SW BIT(0) >>> + >>> +#define SAR_ADC_DELTA_10 0x28 >>> + #define SAR_ADC_DELTA_10_TEMP_SEL BIT(27) >>> + #define SAR_ADC_DELTA_10_TS_REVE1 BIT(26) >>> + #define SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_SHIFT 16 >>> + #define SAR_ADC_DELTA_10_CHAN1_DELTA_VALUE_MASK GENMASK(25, 16) >>> + #define SAR_ADC_DELTA_10_TS_REVE0 BIT(15) >>> + #define SAR_ADC_DELTA_10_TS_C_SHIFT 11 >>> + #define SAR_ADC_DELTA_10_TS_C_MASK GENMASK(14, 11) >>> + #define SAR_ADC_DELTA_10_TS_VBG_EN BIT(10) >>> + #define SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_SHIFT 0 >>> + #define SAR_ADC_DELTA_10_CHAN0_DELTA_VALUE_MASK GENMASK(9, 0) >>> + >>> +/* NOTE: registers from here are undocumented (the vendor Linux kernel driver >>> + * and u-boot source served as reference). These only seem to be relevant on >>> + * GXBB and newer. >>> + */ >>> +#define SAR_ADC_REG11 0x2c >>> + #define SAR_ADC_REG11_BANDGAP_EN BIT(13) >>> + >>> +#define SAR_ADC_REG13 0x34 >>> + #define SAR_ADC_REG13_12BIT_CALIBRATION_MASK GENMASK(13, 8) >>> + >>> +#define SAR_ADC_MAX_FIFO_SIZE 32 >>> +#define SAR_ADC_NUM_CHANNELS ARRAY_SIZE(meson_saradc_iio_channels) >>> +#define SAR_ADC_VALUE_MASK(_priv) (BIT(_priv->resolution) - 1) >>> + >>> +#define MESON_SAR_ADC_CHAN(_chan, _type) { \ >>> + .type = _type, \ >>> + .indexed = true, \ >>> + .channel = _chan, \ >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ >>> + BIT(IIO_CHAN_INFO_AVERAGE_RAW), \ >>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ >>> + .datasheet_name = "SAR_ADC_CH"#_chan, \ >>> +} >>> + >>> +/* TODO: the hardware supports IIO_TEMP for channel 6 as well which is >> Multline comment syntax. > I got this wrong in 2 other places as well. will be fixed in v2, thanks! > >>> + * currently not supported by this driver. >>> + */ >>> +static const struct iio_chan_spec meson_saradc_iio_channels[] = { >>> + MESON_SAR_ADC_CHAN(0, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(1, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(2, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(3, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(4, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(5, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(6, IIO_VOLTAGE), >>> + MESON_SAR_ADC_CHAN(7, IIO_VOLTAGE), >>> + IIO_CHAN_SOFT_TIMESTAMP(8), >>> +}; >>> + >>> +enum meson_saradc_avg_mode { >>> + NO_AVERAGING = 0x0, >>> + MEAN_AVERAGING = 0x1, >>> + MEDIAN_AVERAGING = 0x2, >>> +}; >>> + >>> +enum meson_saradc_num_samples { >>> + ONE_SAMPLE = 0x0, >>> + TWO_SAMPLES = 0x1, >>> + FOUR_SAMPLES = 0x2, >>> + EIGHT_SAMPLES = 0x3, >>> +}; >>> + >>> +enum meson_saradc_chan7_mux_sel { >>> + CHAN7_MUX_VSS = 0x0, >>> + CHAN7_MUX_VDD_DIV4 = 0x1, >>> + CHAN7_MUX_VDD_DIV2 = 0x2, >>> + CHAN7_MUX_VDD_MUL3_DIV4 = 0x3, >>> + CHAN7_MUX_VDD = 0x4, >>> + CHAN7_MUX_CH7_INPUT = 0x7, >>> +}; >>> + >>> +struct meson_saradc_priv { >>> + struct regmap *regmap; >>> + struct clk *clkin; >>> + struct clk *core_clk; >>> + struct clk *sana_clk; >>> + struct clk *adc_sel_clk; >>> + struct clk *adc_clk; >>> + struct clk_gate clk_gate; >>> + struct clk *adc_div_clk; >>> + struct clk_divider clk_div; >>> + struct regulator *vref; >>> + struct completion completion; >>> + u8 resolution; >>> +}; >>> + >>> +static const struct regmap_config meson_saradc_regmap_config = { >>> + .reg_bits = 8, >>> + .val_bits = 32, >>> + .reg_stride = 4, >>> + .max_register = SAR_ADC_REG13, >>> +}; >>> + >>> +static unsigned int meson_saradc_get_fifo_count(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + u32 regval; >>> + >>> + regmap_read(priv->regmap, SAR_ADC_REG0, ®val); >>> + >>> + return FIELD_GET(SAR_ADC_REG0_FIFO_COUNT_MASK, regval); >>> +} >>> + >>> +static int meson_saradc_wait_busy_clear(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int regval, timeout = 10000; >>> + >>> + do { >>> + udelay(1); >>> + regmap_read(priv->regmap, SAR_ADC_REG0, ®val); >>> + } while (FIELD_GET(SAR_ADC_REG0_BUSY_MASK, regval) && timeout--); >>> + >>> + if (timeout < 0) >>> + return -ETIMEDOUT; >>> + >>> + return 0; >>> +} >>> + >>> +static int meson_saradc_read_raw_sample(struct iio_dev *indio_dev, >>> + const struct iio_chan_spec *chan, >>> + int *val) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int ret, regval, fifo_chan, fifo_val, sum = 0, count = 0; >>> + >>> + ret = meson_saradc_wait_busy_clear(indio_dev); >>> + if (ret) >>> + return ret; >>> + >>> + regmap_read(priv->regmap, SAR_ADC_REG0, ®val); >>> + >>> + while (meson_saradc_get_fifo_count(indio_dev) > 0 && >>> + count < SAR_ADC_MAX_FIFO_SIZE) { >>> + regmap_read(priv->regmap, SAR_ADC_FIFO_RD, ®val); >>> + >>> + fifo_chan = FIELD_GET(SAR_ADC_FIFO_RD_CHAN_ID_MASK, regval); >>> + if (fifo_chan == chan->channel) { >>> + fifo_val = FIELD_GET(SAR_ADC_FIFO_RD_SAMPLE_VALUE_MASK, >>> + regval) & SAR_ADC_VALUE_MASK(priv); >>> + sum += fifo_val; >>> + count++; >>> + } >>> + } >>> + >>> + if (!count) >>> + return -ENOENT; >>> + >>> + *val = sum / count; >>> + >>> + return 0; >>> +} >>> + >>> +static void meson_saradc_set_averaging(struct iio_dev *indio_dev, >>> + const struct iio_chan_spec *chan, >>> + enum meson_saradc_avg_mode mode, >>> + enum meson_saradc_num_samples samples) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + u32 val; >>> + >>> + val = samples << SAR_ADC_AVG_CNTL_NUM_SAMPLES_SHIFT(chan->channel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_AVG_CNTL, >>> + SAR_ADC_AVG_CNTL_NUM_SAMPLES_MASK(chan->channel), >>> + val); >>> + >>> + val = mode << SAR_ADC_AVG_CNTL_AVG_MODE_SHIFT(chan->channel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_AVG_CNTL, >>> + SAR_ADC_AVG_CNTL_AVG_MODE_MASK(chan->channel), val); >>> +} >>> + >>> +static void meson_saradc_enable_channel(struct iio_dev *indio_dev, >>> + const struct iio_chan_spec *chan) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + u32 regval; >>> + >>> + /* the SAR ADC engine allows sampling multiple channels at the same >>> + * time. to keep it simple we're only working with one *internal* >>> + * channel, which starts counting at index 0 (which means: count = 1). >>> + */ >>> + regval = FIELD_PREP(SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, 0); >>> + regmap_update_bits(priv->regmap, SAR_ADC_CHAN_LIST, >>> + SAR_ADC_CHAN_LIST_MAX_INDEX_MASK, regval); >>> + >>> + /* map channel index 0 to the channel which we want to read */ >>> + regval = FIELD_PREP(SAR_ADC_CHAN_CHAN_ENTRY_MASK(0), chan->channel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_CHAN_LIST, >>> + SAR_ADC_CHAN_CHAN_ENTRY_MASK(0), regval); >>> + >>> + regval = FIELD_PREP(SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_MUX_MASK, >>> + chan->channel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_DETECT_IDLE_SW, >>> + SAR_ADC_DETECT_IDLE_SW_DETECT_MODE_MUX_MASK, >>> + regval); >>> + >>> + regval = FIELD_PREP(SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_MUX_SEL_MASK, >>> + chan->channel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_DETECT_IDLE_SW, >>> + SAR_ADC_DETECT_IDLE_SW_IDLE_MODE_MUX_SEL_MASK, >>> + regval); >>> + >>> + if (chan->channel == 6) >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELTA_10, >>> + SAR_ADC_DELTA_10_TEMP_SEL, 0); >>> +} >>> + >>> +static void meson_saradc_set_channel7_mux(struct iio_dev *indio_dev, >>> + enum meson_saradc_chan7_mux_sel sel) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + u32 regval; >>> + >>> + regval = FIELD_PREP(SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, sel); >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG3, >>> + SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval); >>> + >>> + usleep_range(10, 20); >>> +} >>> + >>> +static void meson_saradc_start_sample_engine(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG0, >>> + SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, >>> + SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG0, >>> + SAR_ADC_REG0_SAMPLING_START, >>> + SAR_ADC_REG0_SAMPLING_START); >>> +} >>> + >>> +static void meson_saradc_stop_sample_engine(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG0, >>> + SAR_ADC_REG0_SAMPLING_STOP, >>> + SAR_ADC_REG0_SAMPLING_STOP); >>> + >>> + /* wait until all modules are stopped */ >>> + meson_saradc_wait_busy_clear(indio_dev); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG0, >>> + SAR_ADC_REG0_SAMPLE_ENGINE_ENABLE, 0); >>> +} >>> + >>> +static void meson_saradc_lock(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int val; >>> + >>> + mutex_lock(&indio_dev->mlock); >>> + >>> + /* prevent BL30 from using the SAR ADC while we are using it */ >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_KERNEL_BUSY, >>> + SAR_ADC_DELAY_KERNEL_BUSY); >>> + >>> + /* wait until BL30 releases it's lock (so we can use the SAR ADC) */ >>> + do { >>> + udelay(1); >>> + regmap_read(priv->regmap, SAR_ADC_DELAY, &val); >>> + } while (val & SAR_ADC_DELAY_BL30_BUSY); >>> +} >>> + >>> +static void meson_saradc_unlock(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + >>> + /* allow BL30 to use the SAR ADC again */ >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_KERNEL_BUSY, 0); >>> + >>> + mutex_unlock(&indio_dev->mlock); >>> +} >>> + >>> +static int meson_saradc_get_sample(struct iio_dev *indio_dev, >>> + const struct iio_chan_spec *chan, >>> + enum meson_saradc_avg_mode avg_mode, >>> + enum meson_saradc_num_samples avg_samples, >>> + int *val) >>> +{ >>> + int ret, tmp; >>> + >>> + meson_saradc_lock(indio_dev); >>> + >>> + /* clear old values from the FIFO buffer, ignoring errors */ >>> + meson_saradc_read_raw_sample(indio_dev, chan, &tmp); >>> + >>> + meson_saradc_set_averaging(indio_dev, chan, avg_mode, avg_samples); >>> + >>> + meson_saradc_enable_channel(indio_dev, chan); >>> + >>> + meson_saradc_start_sample_engine(indio_dev); >>> + ret = meson_saradc_read_raw_sample(indio_dev, chan, val); >>> + meson_saradc_stop_sample_engine(indio_dev); >>> + >>> + meson_saradc_unlock(indio_dev); >>> + >>> + if (ret) { >>> + dev_warn(&indio_dev->dev, >>> + "failed to read sample for channel %d: %d\n", >>> + chan->channel, ret); >>> + return ret; >>> + } >>> + >>> + return IIO_VAL_INT; >>> +} >>> + >>> +static int meson_saradc_iio_info_read_raw(struct iio_dev *indio_dev, >>> + const struct iio_chan_spec *chan, >>> + int *val, int *val2, long mask) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int ret; >>> + >>> + switch (mask) { >>> + case IIO_CHAN_INFO_RAW: >>> + return meson_saradc_get_sample(indio_dev, chan, NO_AVERAGING, >>> + ONE_SAMPLE, val); >>> + break; >>> + >>> + case IIO_CHAN_INFO_AVERAGE_RAW: >>> + return meson_saradc_get_sample(indio_dev, chan, MEAN_AVERAGING, >>> + EIGHT_SAMPLES, val); >>> + break; >>> + >>> + case IIO_CHAN_INFO_SCALE: >>> + ret = regulator_get_voltage(priv->vref); >>> + if (ret < 0) { >>> + dev_err(&indio_dev->dev, >>> + "failed to get vref voltage: %d\n", ret); >>> + return ret; >>> + } >>> + >>> + *val = ret / 1000; >>> + *val2 = priv->resolution; >>> + return IIO_VAL_FRACTIONAL_LOG2; >>> + >>> + default: >>> + return -EINVAL; >>> + } >>> +} >>> + >>> +static int meson_saradc_clk_init(struct iio_dev *indio_dev, void __iomem *base) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + struct clk_init_data init; >>> + char clk_name[32]; >>> + const char *clk_parents[1]; >>> + >>> + snprintf(clk_name, sizeof(clk_name), "%s#adc_div", >>> + of_node_full_name(indio_dev->dev.of_node)); >>> + init.name = devm_kstrdup(&indio_dev->dev, clk_name, GFP_KERNEL); >>> + init.flags = 0; >>> + init.ops = &clk_divider_ops; >>> + clk_parents[0] = __clk_get_name(priv->clkin); >>> + init.parent_names = clk_parents; >>> + init.num_parents = 1; >>> + >>> + priv->clk_div.reg = base + SAR_ADC_REG3; >>> + priv->clk_div.shift = SAR_ADC_REG3_ADC_CLK_DIV_SHIFT; >>> + priv->clk_div.width = SAR_ADC_REG3_ADC_CLK_DIV_WIDTH; >>> + priv->clk_div.hw.init = &init; >>> + priv->clk_div.flags = 0; >>> + >>> + priv->adc_div_clk = devm_clk_register(&indio_dev->dev, >>> + &priv->clk_div.hw); >>> + if (WARN_ON(IS_ERR(priv->adc_div_clk))) >>> + return PTR_ERR(priv->adc_div_clk); >>> + >>> + snprintf(clk_name, sizeof(clk_name), "%s#adc_en", >>> + of_node_full_name(indio_dev->dev.of_node)); >>> + init.name = devm_kstrdup(&indio_dev->dev, clk_name, GFP_KERNEL); >>> + init.flags = CLK_SET_RATE_PARENT; >>> + init.ops = &clk_gate_ops; >>> + clk_parents[0] = __clk_get_name(priv->adc_div_clk); >>> + init.parent_names = clk_parents; >>> + init.num_parents = 1; >>> + >>> + priv->clk_gate.reg = base + SAR_ADC_REG3; >>> + priv->clk_gate.bit_idx = fls(SAR_ADC_REG3_CLK_EN); >>> + priv->clk_gate.hw.init = &init; >>> + >>> + priv->adc_clk = devm_clk_register(&indio_dev->dev, &priv->clk_gate.hw); >>> + if (WARN_ON(IS_ERR(priv->adc_clk))) >>> + return PTR_ERR(priv->adc_clk); >>> + >>> + return 0; >>> +} >>> + >>> +static int meson_saradc_init(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int regval, ret; >>> + >>> + /* make sure we start at CH7 input */ >> why? Seems like a little more detail would be good here ;) > I'll change this to "make sure we start at CH7 input since the other > muxes are only used for internal calibration." in v2 > >>> + meson_saradc_set_channel7_mux(indio_dev, CHAN7_MUX_CH7_INPUT); >>> + >>> + regmap_read(priv->regmap, SAR_ADC_REG3, ®val); >>> + if (regval & SAR_ADC_REG3_BL30_INITIALIZED) { >>> + dev_info(&indio_dev->dev, "already initialized by BL30\n"); >>> + return 0; >>> + } >>> + >>> + dev_info(&indio_dev->dev, "initializing SAR ADC\n"); >> I'd argue this provides no useful info so should be dropped. >> Useful for debugging no doubt, but just noise going forward. > do you want me to remove them or should I turn them into dev_dbg() (so > they can be enabled for debugging purposes)? Drop it entirely. > >>> + >>> + meson_saradc_stop_sample_engine(indio_dev); >>> + >>> + /* update the channel 6 MUX to select the temperature sensor */ >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG0, >>> + SAR_ADC_REG0_ADC_TEMP_SEN_SEL, >>> + SAR_ADC_REG0_ADC_TEMP_SEN_SEL); >>> + >>> + /* disable all channels by default */ >>> + regmap_write(priv->regmap, SAR_ADC_CHAN_LIST, 0x0); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG3, >>> + SAR_ADC_REG3_CTRL_SAMPLING_CLOCK_PHASE, 0); >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG3, >>> + SAR_ADC_REG3_CNTL_USE_SC_DLY, >>> + SAR_ADC_REG3_CNTL_USE_SC_DLY); >>> + >>> + /* delay between two samples = (10+1) * 1uS */ >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, >>> + FIELD_PREP(SAR_ADC_DELAY_SAMPLE_DLY_CNT_MASK, 10)); >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, >>> + FIELD_PREP(SAR_ADC_DELAY_SAMPLE_DLY_SEL_MASK, 0)); >>> + >>> + /* delay between two samples = (10+1) * 1uS */ >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, >>> + FIELD_PREP(SAR_ADC_DELAY_INPUT_DLY_CNT_MASK, 10)); >>> + regmap_update_bits(priv->regmap, SAR_ADC_DELAY, >>> + SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, >>> + FIELD_PREP(SAR_ADC_DELAY_INPUT_DLY_SEL_MASK, 1)); >>> + >> Cool. I hadn't come across FIELD_PREP before. Neater and tidier than having >> a shift and a mask for at least some usecases. > I think these were introduced with v4.9. I like them because I tend > use GENMASK() incorrectly and with those macros I get an error at > compile-time (without having to debug my code at all) > >>> + ret = clk_set_parent(priv->adc_sel_clk, priv->clkin); >>> + if (ret) { >>> + dev_err(&indio_dev->dev, >>> + "failed to set adc parent to clkin\n"); >>> + return ret; >>> + } >>> + >>> + ret = clk_set_rate(priv->adc_clk, 1200000); >>> + if (ret) { >>> + dev_err(&indio_dev->dev, "failed to set adc clock rate\n"); >>> + return ret; >>> + } >>> + >>> + return 0; >>> +} >>> + >>> +static int meson_saradc_hw_enable(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + int ret; >>> + >>> + meson_saradc_lock(indio_dev); >>> + >>> + ret = regulator_enable(priv->vref); >>> + if (ret < 0) { >>> + dev_err(&indio_dev->dev, "failed to enable vref regulator\n"); >>> + goto err_vref; >>> + } >>> + >>> + ret = clk_prepare_enable(priv->core_clk); >>> + if (ret) { >>> + dev_err(&indio_dev->dev, "failed to enable core clk\n"); >>> + goto err_core_clk; >>> + } >>> + >>> + ret = clk_prepare_enable(priv->sana_clk); >>> + if (ret) { >>> + dev_err(&indio_dev->dev, "failed to enable sana clk\n"); >>> + goto err_sana_clk; >>> + } >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG11, >>> + SAR_ADC_REG11_BANDGAP_EN, SAR_ADC_REG11_BANDGAP_EN); >> Is this controlling an offset for a bandgap or some actual electronics? >> Not sure if it should be disabled on error and the datasheets I've found are >> far from great! You disable it in the disable, so I'd expect it to be >> unwound on error in here too. > actually the bandgap is not documented at all :( > >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG3, SAR_ADC_REG3_ADC_EN, >>> + SAR_ADC_REG3_ADC_EN); >> The fact you turn this of in the disable suggests to me that on error >> you should be doing it in here too. > I will disable this along with SAR_ADC_REG11_BANDGAP_EN in the > err_adc_clk label, thanks for spotting this. > >>> + >>> + udelay(5); >>> + >>> + ret = clk_prepare_enable(priv->adc_clk); >>> + if (ret) { >>> + dev_err(&indio_dev->dev, "failed to enable adc_en clk\n"); >>> + goto err_adc_clk; >>> + } >>> + >>> + meson_saradc_unlock(indio_dev); >>> + >>> + return 0; >>> + >>> +err_adc_clk: >>> + clk_disable_unprepare(priv->sana_clk); >>> +err_sana_clk: >>> + clk_disable_unprepare(priv->core_clk); >>> +err_core_clk: >>> + regulator_disable(priv->vref); >>> +err_vref: >>> + meson_saradc_unlock(indio_dev); >>> + return ret; >>> +} >>> + >>> +static void meson_saradc_hw_disable(struct iio_dev *indio_dev) >>> +{ >>> + struct meson_saradc_priv *priv = iio_priv(indio_dev); >>> + >>> + meson_saradc_lock(indio_dev); >>> + >>> + clk_disable_unprepare(priv->adc_clk); >>> + >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG3, SAR_ADC_REG3_ADC_EN, 0); >>> + regmap_update_bits(priv->regmap, SAR_ADC_REG11, >>> + SAR_ADC_REG11_BANDGAP_EN, 0); >>> + >>> + clk_disable_unprepare(priv->sana_clk); >>> + clk_disable_unprepare(priv->core_clk); >>> + >>> + regulator_disable(priv->vref); >>> + >>> + meson_saradc_unlock(indio_dev); >>> +} >>> + >>> +static const struct iio_info meson_saradc_iio_info = { >>> + .read_raw = meson_saradc_iio_info_read_raw, >>> + .driver_module = THIS_MODULE, >>> +}; >>> + >>> +static const struct of_device_id meson_saradc_of_match[] = { >>> + { >>> + .compatible = "amlogic,meson-gxbb-saradc", >>> + .data = (void *)10, >> Might have been worth having a structure array indexed from an enum. >> For now it is overkill, but seems likely there are a few other differences >> that aren't supported yet? > what do you mean with "structure array indexed from an enum"? I can > introduce some match-specific struct if you want (just like it's done > in rockchip_saradc.c with "struct rockchip_saradc_data"). That works, or data can be an enum indexing an array of similar structures. It doesn't really matter. > >>> + }, { >>> + .compatible = "amlogic,meson-gxl-saradc", >>> + .data = (void *)12, >>> + }, >>> + {}, >>> +}; >>> +MODULE_DEVICE_TABLE(of, meson_saradc_of_match); >>> + >>> +static int meson_saradc_probe(struct platform_device *pdev) >>> +{ >>> + struct meson_saradc_priv *priv; >>> + struct iio_dev *indio_dev; >>> + struct resource *res; >>> + void __iomem *base; >>> + const struct of_device_id *match; >>> + int ret; >>> + >>> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv)); >>> + if (!indio_dev) { >>> + dev_err(&pdev->dev, "failed allocating iio device\n"); >>> + return -ENOMEM; >>> + } >>> + >>> + priv = iio_priv(indio_dev); >>> + >>> + match = of_match_device(meson_saradc_of_match, &pdev->dev); >>> + priv->resolution = (unsigned long)match->data; >>> + >>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >>> + base = devm_ioremap_resource(&pdev->dev, res); >>> + if (IS_ERR(base)) >>> + return PTR_ERR(base); >>> + >>> + priv->regmap = devm_regmap_init_mmio(&pdev->dev, base, >>> + &meson_saradc_regmap_config); >>> + if (IS_ERR(priv->regmap)) >>> + return PTR_ERR(priv->regmap); >>> + >>> + init_completion(&priv->completion); >>> + >>> + priv->clkin = devm_clk_get(&pdev->dev, "clkin"); >>> + if (IS_ERR(priv->clkin)) { >>> + dev_err(&pdev->dev, "failed to get clkin\n"); >>> + return PTR_ERR(priv->clkin); >>> + } >>> + >>> + priv->core_clk = devm_clk_get(&pdev->dev, "core"); >>> + if (IS_ERR(priv->core_clk)) { >>> + dev_err(&pdev->dev, "failed to get core clk\n"); >>> + return PTR_ERR(priv->core_clk); >>> + } >>> + >>> + priv->sana_clk = devm_clk_get(&pdev->dev, "sana"); >> Oh for a devm_clk_get_optional to handle this boiler plate neatly. >> It's been suggested before, but nothing seems to have come of it. > I guess quite a few drivers would benefit from that. maybe we should > take this to the linux-clk list again? Perhaps. I guess this has been proposed before but gone nowhere. I haven't digged into why though. > >> Some array clk get functions might also clean this up a touch. > yes, unfortunately in this case it's not that easy as it would have to > allow a mix of mandatory and optional clocks. Additionally I cannot > bulk-enable them unconditionally since some of these are simple gates, > others need to be reparented and for some the rate has to be set. > >>> + if (IS_ERR(priv->sana_clk)) { >>> + if (PTR_ERR(priv->sana_clk) == -ENOENT) { >>> + priv->sana_clk = NULL; >>> + } else { >>> + dev_err(&pdev->dev, "failed to get sana clk\n"); >>> + return PTR_ERR(priv->sana_clk); >>> + } >>> + } >>> + >>> + priv->adc_clk = devm_clk_get(&pdev->dev, "adc_clk"); >>> + if (IS_ERR(priv->adc_clk)) { >>> + if (PTR_ERR(priv->adc_clk) == -ENOENT) { >>> + priv->adc_clk = NULL; >>> + } else { >>> + dev_err(&pdev->dev, "failed to get adc clk\n"); >>> + return PTR_ERR(priv->adc_clk); >>> + } >>> + } >>> + >>> + priv->adc_sel_clk = devm_clk_get(&pdev->dev, "adc_sel"); >>> + if (IS_ERR(priv->adc_sel_clk)) { >>> + if (PTR_ERR(priv->adc_sel_clk) == -ENOENT) { >>> + priv->adc_sel_clk = NULL; >>> + } else { >>> + dev_err(&pdev->dev, "failed to get adc_sel clk\n"); >>> + return PTR_ERR(priv->adc_sel_clk); >>> + } >>> + } >>> + >>> + /* on pre-GXBB SoCs the SAR ADC itself provides the ADC clock: */ >>> + if (!priv->adc_clk) { >>> + ret = meson_saradc_clk_init(indio_dev, base); >>> + if (ret) >>> + return ret; >>> + } >>> + >>> + priv->vref = devm_regulator_get(&pdev->dev, "vref"); >>> + if (IS_ERR(priv->vref)) { >>> + dev_err(&pdev->dev, "failed to get vref regulator\n"); >>> + return PTR_ERR(priv->vref); >>> + } >>> + >>> + ret = meson_saradc_init(indio_dev); >>> + if (ret) >>> + goto err; >>> + >>> + ret = meson_saradc_hw_enable(indio_dev); >>> + if (ret) >>> + goto err; >>> + >>> + platform_set_drvdata(pdev, indio_dev); >>> + >>> + indio_dev->name = dev_name(&pdev->dev); >>> + indio_dev->dev.parent = &pdev->dev; >>> + indio_dev->dev.of_node = pdev->dev.of_node; >>> + indio_dev->modes = INDIO_DIRECT_MODE; >>> + indio_dev->info = &meson_saradc_iio_info; >>> + >>> + indio_dev->channels = meson_saradc_iio_channels; >>> + indio_dev->num_channels = SAR_ADC_NUM_CHANNELS; >>> + >>> + ret = iio_device_register(indio_dev); >>> + if (ret) >>> + goto err_hw; >>> + >>> + return 0; >>> + >>> +err_hw: >>> + meson_saradc_hw_disable(indio_dev); >>> +err: >>> + return ret; >>> +} >>> + >>> +static int meson_saradc_remove(struct platform_device *pdev) >>> +{ >>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev); >>> + >>> + meson_saradc_hw_disable(indio_dev); >>> + iio_device_unregister(indio_dev); >>> + >>> + return 0; >>> +} >>> + >>> +#ifdef CONFIG_PM_SLEEP >>> +static int meson_saradc_suspend(struct device *dev) >>> +{ >>> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >>> + >>> + meson_saradc_hw_disable(indio_dev); >>> + >>> + return 0; >>> +} >>> + >>> +static int meson_saradc_resume(struct device *dev) >>> +{ >>> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >>> + >>> + return meson_saradc_hw_enable(indio_dev); >>> +} >>> +#endif /* CONFIG_PM_SLEEP */ >>> + >>> +static SIMPLE_DEV_PM_OPS(meson_saradc_pm_ops, >>> + meson_saradc_suspend, meson_saradc_resume); >>> + >>> +static struct platform_driver meson_saradc_driver = { >>> + .probe = meson_saradc_probe, >>> + .remove = meson_saradc_remove, >>> + .driver = { >>> + .name = "meson-saradc", >>> + .of_match_table = meson_saradc_of_match, >>> + .pm = &meson_saradc_pm_ops, >>> + }, >>> +}; >>> + >>> +module_platform_driver(meson_saradc_driver); >>> + >>> +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>"); >>> +MODULE_DESCRIPTION("Amlogic Meson SAR ADC driver"); >>> +MODULE_LICENSE("GPL v2"); >>> >> > > > Regards, > Martin > > [0] http://lists.infradead.org/pipermail/linux-amlogic/2016-August/000986.html > -- 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
