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622 lines
15 KiB
622 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Renesas R-Car GyroADC driver |
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* |
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* Copyright 2016 Marek Vasut <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/delay.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/io.h> |
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#include <linux/clk.h> |
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#include <linux/of.h> |
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#include <linux/of_irq.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/of_platform.h> |
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#include <linux/err.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/iio/trigger.h> |
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|
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#define DRIVER_NAME "rcar-gyroadc" |
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|
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/* GyroADC registers. */ |
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#define RCAR_GYROADC_MODE_SELECT 0x00 |
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#define RCAR_GYROADC_MODE_SELECT_1_MB88101A 0x0 |
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#define RCAR_GYROADC_MODE_SELECT_2_ADCS7476 0x1 |
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#define RCAR_GYROADC_MODE_SELECT_3_MAX1162 0x3 |
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|
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#define RCAR_GYROADC_START_STOP 0x04 |
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#define RCAR_GYROADC_START_STOP_START BIT(0) |
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#define RCAR_GYROADC_CLOCK_LENGTH 0x08 |
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#define RCAR_GYROADC_1_25MS_LENGTH 0x0c |
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#define RCAR_GYROADC_REALTIME_DATA(ch) (0x10 + ((ch) * 4)) |
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#define RCAR_GYROADC_100MS_ADDED_DATA(ch) (0x30 + ((ch) * 4)) |
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#define RCAR_GYROADC_10MS_AVG_DATA(ch) (0x50 + ((ch) * 4)) |
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#define RCAR_GYROADC_FIFO_STATUS 0x70 |
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#define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch) BIT(0 + (4 * (ch))) |
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#define RCAR_GYROADC_FIFO_STATUS_FULL(ch) BIT(1 + (4 * (ch))) |
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#define RCAR_GYROADC_FIFO_STATUS_ERROR(ch) BIT(2 + (4 * (ch))) |
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#define RCAR_GYROADC_INTR 0x74 |
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#define RCAR_GYROADC_INTR_INT BIT(0) |
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#define RCAR_GYROADC_INTENR 0x78 |
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#define RCAR_GYROADC_INTENR_INTEN BIT(0) |
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#define RCAR_GYROADC_SAMPLE_RATE 800 /* Hz */ |
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#define RCAR_GYROADC_RUNTIME_PM_DELAY_MS 2000 |
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enum rcar_gyroadc_model { |
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RCAR_GYROADC_MODEL_DEFAULT, |
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RCAR_GYROADC_MODEL_R8A7792, |
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}; |
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struct rcar_gyroadc { |
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struct device *dev; |
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void __iomem *regs; |
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struct clk *clk; |
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struct regulator *vref[8]; |
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unsigned int num_channels; |
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enum rcar_gyroadc_model model; |
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unsigned int mode; |
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unsigned int sample_width; |
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}; |
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static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv) |
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{ |
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const unsigned long clk_mhz = clk_get_rate(priv->clk) / 1000000; |
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const unsigned long clk_mul = |
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(priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5; |
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unsigned long clk_len = clk_mhz * clk_mul; |
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/* |
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* According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014, |
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* page 77-7, clock length must be even number. If it's odd number, |
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* add one. |
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*/ |
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if (clk_len & 1) |
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clk_len++; |
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/* Stop the GyroADC. */ |
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writel(0, priv->regs + RCAR_GYROADC_START_STOP); |
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/* Disable IRQ on V2H. */ |
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if (priv->model == RCAR_GYROADC_MODEL_R8A7792) |
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writel(0, priv->regs + RCAR_GYROADC_INTENR); |
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|
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/* Set mode and timing. */ |
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writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT); |
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writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH); |
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writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH); |
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} |
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static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv) |
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{ |
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/* Start sampling. */ |
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writel(RCAR_GYROADC_START_STOP_START, |
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priv->regs + RCAR_GYROADC_START_STOP); |
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|
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/* |
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* Wait for the first conversion to complete. This is longer than |
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* the 1.25 mS in the datasheet because 1.25 mS is not enough for |
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* the hardware to deliver the first sample and the hardware does |
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* then return zeroes instead of valid data. |
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*/ |
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mdelay(3); |
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} |
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static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv) |
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{ |
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/* Stop the GyroADC. */ |
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writel(0, priv->regs + RCAR_GYROADC_START_STOP); |
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} |
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#define RCAR_GYROADC_CHAN(_idx) { \ |
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.type = IIO_VOLTAGE, \ |
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.indexed = 1, \ |
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.channel = (_idx), \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
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BIT(IIO_CHAN_INFO_SCALE), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ |
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} |
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static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = { |
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RCAR_GYROADC_CHAN(0), |
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RCAR_GYROADC_CHAN(1), |
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RCAR_GYROADC_CHAN(2), |
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RCAR_GYROADC_CHAN(3), |
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}; |
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static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = { |
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RCAR_GYROADC_CHAN(0), |
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RCAR_GYROADC_CHAN(1), |
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RCAR_GYROADC_CHAN(2), |
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RCAR_GYROADC_CHAN(3), |
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RCAR_GYROADC_CHAN(4), |
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RCAR_GYROADC_CHAN(5), |
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RCAR_GYROADC_CHAN(6), |
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RCAR_GYROADC_CHAN(7), |
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}; |
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static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = { |
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RCAR_GYROADC_CHAN(0), |
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RCAR_GYROADC_CHAN(1), |
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RCAR_GYROADC_CHAN(2), |
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RCAR_GYROADC_CHAN(3), |
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RCAR_GYROADC_CHAN(4), |
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RCAR_GYROADC_CHAN(5), |
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RCAR_GYROADC_CHAN(6), |
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RCAR_GYROADC_CHAN(7), |
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}; |
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static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on) |
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{ |
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struct device *dev = priv->dev; |
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int ret; |
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if (on) { |
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ret = pm_runtime_get_sync(dev); |
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if (ret < 0) |
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pm_runtime_put_noidle(dev); |
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} else { |
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pm_runtime_mark_last_busy(dev); |
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ret = pm_runtime_put_autosuspend(dev); |
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} |
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return ret; |
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} |
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static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct rcar_gyroadc *priv = iio_priv(indio_dev); |
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struct regulator *consumer; |
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unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel); |
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unsigned int vref; |
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int ret; |
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/* |
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* MB88101 is special in that it has only single regulator for |
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* all four channels. |
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*/ |
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if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) |
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consumer = priv->vref[0]; |
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else |
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consumer = priv->vref[chan->channel]; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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if (chan->type != IIO_VOLTAGE) |
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return -EINVAL; |
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/* Channel not connected. */ |
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if (!consumer) |
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return -EINVAL; |
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ret = iio_device_claim_direct_mode(indio_dev); |
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if (ret) |
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return ret; |
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ret = rcar_gyroadc_set_power(priv, true); |
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if (ret < 0) { |
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iio_device_release_direct_mode(indio_dev); |
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return ret; |
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} |
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*val = readl(priv->regs + datareg); |
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*val &= BIT(priv->sample_width) - 1; |
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ret = rcar_gyroadc_set_power(priv, false); |
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iio_device_release_direct_mode(indio_dev); |
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if (ret < 0) |
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return ret; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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/* Channel not connected. */ |
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if (!consumer) |
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return -EINVAL; |
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vref = regulator_get_voltage(consumer); |
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*val = vref / 1000; |
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*val2 = 1 << priv->sample_width; |
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return IIO_VAL_FRACTIONAL; |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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*val = RCAR_GYROADC_SAMPLE_RATE; |
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return IIO_VAL_INT; |
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default: |
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return -EINVAL; |
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} |
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} |
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static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev, |
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unsigned int reg, unsigned int writeval, |
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unsigned int *readval) |
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{ |
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struct rcar_gyroadc *priv = iio_priv(indio_dev); |
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unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS; |
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if (readval == NULL) |
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return -EINVAL; |
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if (reg % 4) |
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return -EINVAL; |
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/* Handle the V2H case with extra interrupt block. */ |
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if (priv->model == RCAR_GYROADC_MODEL_R8A7792) |
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maxreg = RCAR_GYROADC_INTENR; |
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if (reg > maxreg) |
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return -EINVAL; |
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*readval = readl(priv->regs + reg); |
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return 0; |
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} |
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static const struct iio_info rcar_gyroadc_iio_info = { |
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.read_raw = rcar_gyroadc_read_raw, |
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.debugfs_reg_access = rcar_gyroadc_reg_access, |
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}; |
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static const struct of_device_id rcar_gyroadc_match[] = { |
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{ |
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/* R-Car compatible GyroADC */ |
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.compatible = "renesas,rcar-gyroadc", |
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.data = (void *)RCAR_GYROADC_MODEL_DEFAULT, |
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}, { |
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/* R-Car V2H specialty with interrupt registers. */ |
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.compatible = "renesas,r8a7792-gyroadc", |
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.data = (void *)RCAR_GYROADC_MODEL_R8A7792, |
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}, { |
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/* sentinel */ |
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} |
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}; |
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MODULE_DEVICE_TABLE(of, rcar_gyroadc_match); |
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static const struct of_device_id rcar_gyroadc_child_match[] = { |
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/* Mode 1 ADCs */ |
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{ |
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.compatible = "fujitsu,mb88101a", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A, |
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}, |
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/* Mode 2 ADCs */ |
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{ |
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.compatible = "ti,adcs7476", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, |
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}, { |
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.compatible = "ti,adc121", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, |
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}, { |
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.compatible = "adi,ad7476", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476, |
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}, |
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/* Mode 3 ADCs */ |
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{ |
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.compatible = "maxim,max1162", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, |
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}, { |
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.compatible = "maxim,max11100", |
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.data = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162, |
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}, |
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{ /* sentinel */ } |
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}; |
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static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev) |
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{ |
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const struct of_device_id *of_id; |
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const struct iio_chan_spec *channels; |
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struct rcar_gyroadc *priv = iio_priv(indio_dev); |
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struct device *dev = priv->dev; |
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struct device_node *np = dev->of_node; |
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struct device_node *child; |
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struct regulator *vref; |
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unsigned int reg; |
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unsigned int adcmode = -1, childmode; |
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unsigned int sample_width; |
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unsigned int num_channels; |
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int ret, first = 1; |
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for_each_child_of_node(np, child) { |
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of_id = of_match_node(rcar_gyroadc_child_match, child); |
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if (!of_id) { |
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dev_err(dev, "Ignoring unsupported ADC \"%pOFn\".", |
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child); |
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continue; |
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} |
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childmode = (uintptr_t)of_id->data; |
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switch (childmode) { |
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case RCAR_GYROADC_MODE_SELECT_1_MB88101A: |
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sample_width = 12; |
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channels = rcar_gyroadc_iio_channels_1; |
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num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1); |
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break; |
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case RCAR_GYROADC_MODE_SELECT_2_ADCS7476: |
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sample_width = 15; |
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channels = rcar_gyroadc_iio_channels_2; |
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num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2); |
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break; |
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case RCAR_GYROADC_MODE_SELECT_3_MAX1162: |
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sample_width = 16; |
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channels = rcar_gyroadc_iio_channels_3; |
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num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3); |
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break; |
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default: |
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goto err_e_inval; |
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} |
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/* |
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* MB88101 is special in that it's only a single chip taking |
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* up all the CHS lines. Thus, the DT binding is also special |
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* and has no reg property. If we run into such ADC, handle |
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* it here. |
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*/ |
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if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { |
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reg = 0; |
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} else { |
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ret = of_property_read_u32(child, "reg", ®); |
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if (ret) { |
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dev_err(dev, |
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"Failed to get child reg property of ADC \"%pOFn\".\n", |
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child); |
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goto err_of_node_put; |
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} |
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/* Channel number is too high. */ |
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if (reg >= num_channels) { |
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dev_err(dev, |
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"Only %i channels supported with %pOFn, but reg = <%i>.\n", |
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num_channels, child, reg); |
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goto err_e_inval; |
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} |
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} |
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/* Child node selected different mode than the rest. */ |
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if (!first && (adcmode != childmode)) { |
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dev_err(dev, |
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"Channel %i uses different ADC mode than the rest.\n", |
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reg); |
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goto err_e_inval; |
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} |
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/* Channel is valid, grab the regulator. */ |
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dev->of_node = child; |
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vref = devm_regulator_get(dev, "vref"); |
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dev->of_node = np; |
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if (IS_ERR(vref)) { |
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dev_dbg(dev, "Channel %i 'vref' supply not connected.\n", |
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reg); |
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ret = PTR_ERR(vref); |
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goto err_of_node_put; |
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} |
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priv->vref[reg] = vref; |
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if (!first) |
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continue; |
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/* First child node which passed sanity tests. */ |
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adcmode = childmode; |
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first = 0; |
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priv->num_channels = num_channels; |
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priv->mode = childmode; |
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priv->sample_width = sample_width; |
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indio_dev->channels = channels; |
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indio_dev->num_channels = num_channels; |
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/* |
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* MB88101 is special and we only have one such device |
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* attached to the GyroADC at a time, so if we found it, |
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* we can stop parsing here. |
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*/ |
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if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) { |
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of_node_put(child); |
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break; |
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} |
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} |
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if (first) { |
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dev_err(dev, "No valid ADC channels found, aborting.\n"); |
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return -EINVAL; |
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} |
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return 0; |
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err_e_inval: |
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ret = -EINVAL; |
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err_of_node_put: |
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of_node_put(child); |
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return ret; |
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} |
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static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev) |
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{ |
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struct rcar_gyroadc *priv = iio_priv(indio_dev); |
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unsigned int i; |
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for (i = 0; i < priv->num_channels; i++) { |
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if (!priv->vref[i]) |
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continue; |
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regulator_disable(priv->vref[i]); |
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} |
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} |
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static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev) |
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{ |
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struct rcar_gyroadc *priv = iio_priv(indio_dev); |
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struct device *dev = priv->dev; |
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unsigned int i; |
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int ret; |
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for (i = 0; i < priv->num_channels; i++) { |
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if (!priv->vref[i]) |
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continue; |
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ret = regulator_enable(priv->vref[i]); |
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if (ret) { |
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dev_err(dev, "Failed to enable regulator %i (ret=%i)\n", |
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i, ret); |
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goto err; |
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} |
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} |
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return 0; |
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err: |
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rcar_gyroadc_deinit_supplies(indio_dev); |
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return ret; |
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} |
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static int rcar_gyroadc_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct rcar_gyroadc *priv; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(dev, sizeof(*priv)); |
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if (!indio_dev) |
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return -ENOMEM; |
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priv = iio_priv(indio_dev); |
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priv->dev = dev; |
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priv->regs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->regs)) |
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return PTR_ERR(priv->regs); |
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priv->clk = devm_clk_get(dev, "fck"); |
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if (IS_ERR(priv->clk)) |
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return dev_err_probe(dev, PTR_ERR(priv->clk), |
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"Failed to get IF clock\n"); |
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ret = rcar_gyroadc_parse_subdevs(indio_dev); |
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if (ret) |
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return ret; |
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ret = rcar_gyroadc_init_supplies(indio_dev); |
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if (ret) |
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return ret; |
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priv->model = (enum rcar_gyroadc_model) |
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of_device_get_match_data(&pdev->dev); |
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platform_set_drvdata(pdev, indio_dev); |
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|
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indio_dev->name = DRIVER_NAME; |
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indio_dev->info = &rcar_gyroadc_iio_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = clk_prepare_enable(priv->clk); |
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if (ret) { |
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dev_err(dev, "Could not prepare or enable the IF clock.\n"); |
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goto err_clk_if_enable; |
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} |
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pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS); |
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pm_runtime_use_autosuspend(dev); |
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pm_runtime_enable(dev); |
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|
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pm_runtime_get_sync(dev); |
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rcar_gyroadc_hw_init(priv); |
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rcar_gyroadc_hw_start(priv); |
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|
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ret = iio_device_register(indio_dev); |
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if (ret) { |
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dev_err(dev, "Couldn't register IIO device.\n"); |
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goto err_iio_device_register; |
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} |
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|
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pm_runtime_put_sync(dev); |
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|
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return 0; |
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|
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err_iio_device_register: |
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rcar_gyroadc_hw_stop(priv); |
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pm_runtime_put_sync(dev); |
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pm_runtime_disable(dev); |
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pm_runtime_set_suspended(dev); |
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clk_disable_unprepare(priv->clk); |
|
err_clk_if_enable: |
|
rcar_gyroadc_deinit_supplies(indio_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static int rcar_gyroadc_remove(struct platform_device *pdev) |
|
{ |
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
|
struct rcar_gyroadc *priv = iio_priv(indio_dev); |
|
struct device *dev = priv->dev; |
|
|
|
iio_device_unregister(indio_dev); |
|
pm_runtime_get_sync(dev); |
|
rcar_gyroadc_hw_stop(priv); |
|
pm_runtime_put_sync(dev); |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_suspended(dev); |
|
clk_disable_unprepare(priv->clk); |
|
rcar_gyroadc_deinit_supplies(indio_dev); |
|
|
|
return 0; |
|
} |
|
|
|
#if defined(CONFIG_PM) |
|
static int rcar_gyroadc_suspend(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct rcar_gyroadc *priv = iio_priv(indio_dev); |
|
|
|
rcar_gyroadc_hw_stop(priv); |
|
|
|
return 0; |
|
} |
|
|
|
static int rcar_gyroadc_resume(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct rcar_gyroadc *priv = iio_priv(indio_dev); |
|
|
|
rcar_gyroadc_hw_start(priv); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static const struct dev_pm_ops rcar_gyroadc_pm_ops = { |
|
SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL) |
|
}; |
|
|
|
static struct platform_driver rcar_gyroadc_driver = { |
|
.probe = rcar_gyroadc_probe, |
|
.remove = rcar_gyroadc_remove, |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
.of_match_table = rcar_gyroadc_match, |
|
.pm = &rcar_gyroadc_pm_ops, |
|
}, |
|
}; |
|
|
|
module_platform_driver(rcar_gyroadc_driver); |
|
|
|
MODULE_AUTHOR("Marek Vasut <[email protected]>"); |
|
MODULE_DESCRIPTION("Renesas R-Car GyroADC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|