> -----Original Message----- > From: Jonathan Cameron [mailto:jic23@xxxxxxxxxx] > Sent: 28 June 2016 00:41 > To: Raveendra Padasalagi > Cc: Peter Meerwald-Stadler; Rob Herring; Russell King; Arnd Bergmann; > linux- > iio@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; Pawel Moll; Mark Rutland; Ian Campbell; Kumar > Gala; Jonathan Richardson; Jon Mason; Florian Fainelli; Anup Patel; Ray > Jui; > Scott Branden; Pramod Kumar; linux-kernel@xxxxxxxxxxxxxxx; bcm-kernel- > feedback-list > Subject: Re: [PATCH v3 2/3] iio: Add driver for Broadcom iproc-static-adc > > On 27/06/16 07:25, Raveendra Padasalagi wrote: > > On Sun, Jun 26, 2016 at 4:08 PM, Jonathan Cameron <jic23@xxxxxxxxxx> > wrote: > >> On 22/06/16 07:11, Raveendra Padasalagi wrote: > >>> This patch adds basic driver implementation for Broadcom's static > >>> adc controller used in iProc SoC's family. > >>> > >>> Signed-off-by: Raveendra Padasalagi > >>> <raveendra.padasalagi@xxxxxxxxxxxx> > >>> Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx> > >>> Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx> > >> A few tiny nitpicks.. Otherwise, looking good to me. > >> > >> Thanks, > >> > >> Jonathan > > > > Thank you. I have provided my view on naming "indio_dev->name" below. > > Need your opinion/suggestion on the same to address it. > > > >>> --- > >>> drivers/iio/adc/Kconfig | 12 + > >>> drivers/iio/adc/Makefile | 1 + > >>> drivers/iio/adc/bcm_iproc_adc.c | 648 > >>> ++++++++++++++++++++++++++++++++++++++++ > >>> 3 files changed, 661 insertions(+) > >>> create mode 100644 drivers/iio/adc/bcm_iproc_adc.c > >>> > >>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index > >>> 25378c5..1de31bd 100644 > >>> --- a/drivers/iio/adc/Kconfig > >>> +++ b/drivers/iio/adc/Kconfig > >>> @@ -153,6 +153,18 @@ config AXP288_ADC > >>> To compile this driver as a module, choose M here: the module > >>> will be > >>> called axp288_adc. > >>> > >>> +config BCM_IPROC_ADC > >>> + tristate "Broadcom IPROC ADC driver" > >>> + depends on ARCH_BCM_IPROC || COMPILE_TEST > >>> + depends on MFD_SYSCON > >>> + default ARCH_BCM_CYGNUS > >>> + help > >>> + Say Y here if you want to add support for the Broadcom static > >>> + ADC driver. > >>> + > >>> + Broadcom iProc ADC driver. Broadcom iProc ADC controller has 8 > >>> + channels. The driver allows the user to read voltage values. > >>> + > >>> config BERLIN2_ADC > >>> tristate "Marvell Berlin2 ADC driver" > >>> depends on ARCH_BERLIN > >>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile > >>> index 38638d4..0ba0d50 100644 > >>> --- a/drivers/iio/adc/Makefile > >>> +++ b/drivers/iio/adc/Makefile > >>> @@ -16,6 +16,7 @@ obj-$(CONFIG_AD799X) += ad799x.o > >>> obj-$(CONFIG_AT91_ADC) += at91_adc.o > >>> obj-$(CONFIG_AT91_SAMA5D2_ADC) += at91-sama5d2_adc.o > >>> obj-$(CONFIG_AXP288_ADC) += axp288_adc.o > >>> +obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o > >>> obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o > >>> obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o > >>> obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o diff --git > >>> a/drivers/iio/adc/bcm_iproc_adc.c b/drivers/iio/adc/bcm_iproc_adc.c > >>> new file mode 100644 index 0000000..e10f6ce > >>> --- /dev/null > >>> +++ b/drivers/iio/adc/bcm_iproc_adc.c > >>> @@ -0,0 +1,648 @@ > >>> +/* > >>> + * Copyright 2016 Broadcom > >>> + * > >>> + * This program is free software; you can redistribute it and/or > >>> +modify > >>> + * it under the terms of the GNU General Public License, version 2, > >>> +as > >>> + * published by the Free Software Foundation (the "GPL"). > >>> + * > >>> + * This program is distributed in the hope that it will be useful, > >>> +but > >>> + * WITHOUT ANY WARRANTY; without even the implied warranty of > >>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > >>> +GNU > >>> + * General Public License version 2 (GPLv2) for more details. > >>> + * > >>> + * You should have received a copy of the GNU General Public > >>> +License > >>> + * version 2 (GPLv2) along with this source code. > >>> + */ > >>> + > >>> +#include <linux/module.h> > >>> +#include <linux/of.h> > >>> +#include <linux/io.h> > >>> +#include <linux/clk.h> > >>> +#include <linux/mfd/syscon.h> > >>> +#include <linux/regmap.h> > >>> +#include <linux/delay.h> > >>> +#include <linux/interrupt.h> > >>> +#include <linux/platform_device.h> > >>> + > >>> +#include <linux/iio/iio.h> > >>> + > >>> +/* Below Register's are common to IPROC ADC and Touchscreen IP */ > >>> +#define IPROC_REGCTL1 0x00 > >>> +#define IPROC_REGCTL2 0x04 > >>> +#define IPROC_INTERRUPT_THRES 0x08 > >>> +#define IPROC_INTERRUPT_MASK 0x0c > >>> +#define IPROC_INTERRUPT_STATUS 0x10 > >>> +#define IPROC_ANALOG_CONTROL 0x1c > >>> +#define IPROC_CONTROLLER_STATUS 0x14 > >>> +#define IPROC_AUX_DATA 0x20 > >>> +#define IPROC_SOFT_BYPASS_CONTROL 0x38 > >>> +#define IPROC_SOFT_BYPASS_DATA 0x3C > >>> + > >>> +/* IPROC ADC Channel register offsets */ > >>> +#define IPROC_ADC_CHANNEL_REGCTL1 0x800 > >>> +#define IPROC_ADC_CHANNEL_REGCTL2 0x804 > >>> +#define IPROC_ADC_CHANNEL_STATUS 0x808 > >>> +#define IPROC_ADC_CHANNEL_INTERRUPT_STATUS 0x80c > >>> +#define IPROC_ADC_CHANNEL_INTERRUPT_MASK 0x810 > >>> +#define IPROC_ADC_CHANNEL_DATA 0x814 > >>> +#define IPROC_ADC_CHANNEL_OFFSET 0x20 > >>> + > >>> +/* Bit definitions for IPROC_REGCTL2 */ > >>> +#define IPROC_ADC_AUXIN_SCAN_ENA BIT(0) > >>> +#define IPROC_ADC_PWR_LDO BIT(5) > >>> +#define IPROC_ADC_PWR_ADC BIT(4) > >>> +#define IPROC_ADC_PWR_BG BIT(3) > >>> +#define IPROC_ADC_CONTROLLER_EN BIT(17) > >>> + > >>> +/* Bit definitions for IPROC_INTERRUPT_MASK and > IPROC_INTERRUPT_STATUS */ > >>> +#define IPROC_ADC_AUXDATA_RDY_INTR BIT(3) > >>> +#define IPROC_ADC_INTR 9 > >>> +#define IPROC_ADC_INTR_MASK (0xFF << IPROC_ADC_INTR) > >>> + > >>> +/* Bit definitions for IPROC_ANALOG_CONTROL */ > >>> +#define IPROC_ADC_CHANNEL_SEL 11 > >>> +#define IPROC_ADC_CHANNEL_SEL_MASK (0x7 << > IPROC_ADC_CHANNEL_SEL) > >>> + > >>> +/* Bit definitions for IPROC_ADC_CHANNEL_REGCTL1 */ > >>> +#define IPROC_ADC_CHANNEL_ROUNDS 0x2 > >>> +#define IPROC_ADC_CHANNEL_ROUNDS_MASK (0x3F << > IPROC_ADC_CHANNEL_ROUNDS) > >>> +#define IPROC_ADC_CHANNEL_MODE 0x1 > >>> +#define IPROC_ADC_CHANNEL_MODE_MASK (0x1 << > IPROC_ADC_CHANNEL_MODE) > >>> +#define IPROC_ADC_CHANNEL_MODE_TDM 0x1 > >>> +#define IPROC_ADC_CHANNEL_MODE_SNAPSHOT 0x0 > >>> +#define IPROC_ADC_CHANNEL_ENABLE 0x0 > >>> +#define IPROC_ADC_CHANNEL_ENABLE_MASK 0x1 > >>> + > >>> +/* Bit definitions for IPROC_ADC_CHANNEL_REGCTL2 */ #define > >>> +IPROC_ADC_CHANNEL_WATERMARK 0x0 #define > >>> +IPROC_ADC_CHANNEL_WATERMARK_MASK \ > >>> + (0x3F << IPROC_ADC_CHANNEL_WATERMARK) > >>> + > >>> +#define IPROC_ADC_WATER_MARK_LEVEL 0x1 > >>> + > >>> +/* Bit definitions for IPROC_ADC_CHANNEL_STATUS */ > >>> +#define IPROC_ADC_CHANNEL_DATA_LOST 0x0 > >>> +#define IPROC_ADC_CHANNEL_DATA_LOST_MASK \ > >>> + (0x0 << IPROC_ADC_CHANNEL_DATA_LOST) > >>> +#define IPROC_ADC_CHANNEL_VALID_ENTERIES 0x1 > >>> +#define IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK \ > >>> + (0xFF << IPROC_ADC_CHANNEL_VALID_ENTERIES) > >>> +#define IPROC_ADC_CHANNEL_TOTAL_ENTERIES 0x9 > >>> +#define IPROC_ADC_CHANNEL_TOTAL_ENTERIES_MASK \ > >>> + (0xFF << IPROC_ADC_CHANNEL_TOTAL_ENTERIES) > >>> + > >>> +/* Bit definitions for IPROC_ADC_CHANNEL_INTERRUPT_MASK */ > >>> +#define IPROC_ADC_CHANNEL_WTRMRK_INTR 0x0 > >>> +#define IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK \ > >>> + (0x1 << IPROC_ADC_CHANNEL_WTRMRK_INTR) > >>> +#define IPROC_ADC_CHANNEL_FULL_INTR 0x1 > >>> +#define IPROC_ADC_CHANNEL_FULL_INTR_MASK \ > >>> + (0x1 << IPROC_ADC_IPROC_ADC_CHANNEL_FULL_INTR) > >>> +#define IPROC_ADC_CHANNEL_EMPTY_INTR 0x2 > >>> +#define IPROC_ADC_CHANNEL_EMPTY_INTR_MASK \ > >>> + (0x1 << IPROC_ADC_CHANNEL_EMPTY_INTR) > >>> + > >>> +#define IPROC_ADC_WATER_MARK_INTR_ENABLE 0x1 > >>> + > >>> +/* Number of time to retry a set of the interrupt mask reg */ > >>> +#define IPROC_ADC_INTMASK_RETRY_ATTEMPTS 10 > >>> + > >>> +#define IPROC_ADC_READ_TIMEOUT (HZ*2) > >>> + > >>> +#define iproc_adc_dbg_reg(dev, priv, reg) \ do { \ > >>> + u32 val; \ > >>> + regmap_read(priv->regmap, reg, &val); \ > >>> + dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \ } while (0) > >>> + > >>> +struct iproc_adc_priv { > >>> + struct regmap *regmap; > >>> + struct clk *adc_clk; > >>> + struct mutex mutex; > >>> + int irqno; > >>> + int chan_val; > >>> + int chan_id; > >>> + struct completion completion; > >>> +}; > >>> + > >>> +static void iproc_adc_reg_dump(struct iio_dev *indio_dev) { > >>> + struct iproc_adc_priv *adc_priv; > >>> + struct device *dev = &indio_dev->dev; > >>> + > >>> + adc_priv = iio_priv(indio_dev); > >> Trivial, but I'd just do this in one line with the declaration of the > >> local variable. > >> > >> struct iprov_adc_priv *adc_priv = iio_priv(indio_dev); > > > > Yes, I missed it to fix. Will address in the next patch. > > Thanks. > >> > >>> + > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL1); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_REGCTL2); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_THRES); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_MASK); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_INTERRUPT_STATUS); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_CONTROLLER_STATUS); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_ANALOG_CONTROL); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_AUX_DATA); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_CONTROL); > >>> + iproc_adc_dbg_reg(dev, adc_priv, IPROC_SOFT_BYPASS_DATA); } > >>> + > >>> +static irqreturn_t iproc_adc_interrupt_handler(int irq, void *data) > >>> +{ > >>> + u32 channel_intr_status; > >>> + u32 intr_status; > >>> + u32 intr_mask; > >>> + struct iio_dev *indio_dev = data; > >>> + struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); > >>> + > >>> + /* > >>> + * This interrupt is shared with the touchscreen driver. > >>> + * Make sure this interrupt is intended for us. > >>> + * Handle only ADC channel specific interrupts. > >>> + */ > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, > &intr_status); > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, > &intr_mask); > >>> + intr_status = intr_status & intr_mask; > >>> + channel_intr_status = (intr_status & IPROC_ADC_INTR_MASK) >> > >>> + IPROC_ADC_INTR; > >>> + if (channel_intr_status) > >>> + return IRQ_WAKE_THREAD; > >>> + > >>> + return IRQ_NONE; > >>> +} > >>> + > >>> +static irqreturn_t iproc_adc_interrupt_thread(int irq, void *data) > >>> +{ > >>> + irqreturn_t retval = IRQ_NONE; > >>> + struct iproc_adc_priv *adc_priv; > >>> + struct iio_dev *indio_dev = data; > >>> + unsigned int valid_entries; > >>> + u32 intr_status; > >>> + u32 intr_channels; > >>> + u32 channel_status; > >>> + u32 ch_intr_status; > >>> + > >>> + adc_priv = iio_priv(indio_dev); > >>> + > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_STATUS, > &intr_status); > >>> + dev_dbg(&indio_dev->dev, > "iproc_adc_interrupt_thread(),INTRPT_STS:%x\n", > >>> + intr_status); > >>> + > >>> + intr_channels = (intr_status & IPROC_ADC_INTR_MASK) >> > IPROC_ADC_INTR; > >>> + if (intr_channels) { > >>> + regmap_read(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_INTERRUPT_STATUS + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> adc_priv->chan_id, > >>> + &ch_intr_status); > >>> + > >>> + if (ch_intr_status & IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK) > { > >>> + regmap_read(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_STATUS + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> + adc_priv->chan_id, > >>> + &channel_status); > >>> + > >>> + valid_entries = ((channel_status & > >>> + IPROC_ADC_CHANNEL_VALID_ENTERIES_MASK) > >>> >> > >>> + IPROC_ADC_CHANNEL_VALID_ENTERIES); > >>> + if (valid_entries >= 1) { > >>> + regmap_read(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_DATA + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> + adc_priv->chan_id, > >>> + &adc_priv->chan_val); > >>> + complete(&adc_priv->completion); > >>> + } else { > >>> + dev_err(&indio_dev->dev, > >>> + "No data rcvd on channel %d\n", > >>> + adc_priv->chan_id); > >>> + } > >>> + regmap_write(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_INTERRUPT_MASK > >>> + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> + adc_priv->chan_id, > >>> + (ch_intr_status & > >>> + > >>> ~(IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK))); > >>> + } > >>> + regmap_write(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_INTERRUPT_STATUS + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> adc_priv->chan_id, > >>> + ch_intr_status); > >>> + regmap_write(adc_priv->regmap, IPROC_INTERRUPT_STATUS, > >>> + intr_channels); > >>> + retval = IRQ_HANDLED; > >>> + } > >>> + > >>> + return retval; > >>> +} > >>> + > >>> +static int iproc_adc_do_read(struct iio_dev *indio_dev, > >>> + int channel, > >>> + u16 *p_adc_data) { > >>> + int read_len = 0; > >>> + u32 val; > >>> + u32 mask; > >>> + u32 val_check; > >>> + int failed_cnt = 0; > >>> + struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); > >>> + > >>> + mutex_lock(&adc_priv->mutex); > >>> + > >>> + /* > >>> + * After a read is complete the ADC interrupts will be disabled > >>> so > >>> + * we can assume this section of code is safe from interrupts. > >>> + */ > >>> + adc_priv->chan_val = -1; > >>> + adc_priv->chan_id = channel; > >>> + > >>> + reinit_completion(&adc_priv->completion); > >>> + /* Clear any pending interrupt */ > >>> + regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS, > >>> + IPROC_ADC_INTR_MASK | > >>> IPROC_ADC_AUXDATA_RDY_INTR, > >>> + ((0x0 << channel) << IPROC_ADC_INTR) | > >>> + IPROC_ADC_AUXDATA_RDY_INTR); > >>> + > >>> + /* Configure channel for snapshot mode and enable */ > >>> + val = (BIT(IPROC_ADC_CHANNEL_ROUNDS) | > >>> + (IPROC_ADC_CHANNEL_MODE_SNAPSHOT << > IPROC_ADC_CHANNEL_MODE) | > >>> + (0x1 << IPROC_ADC_CHANNEL_ENABLE)); > >>> + > >>> + mask = IPROC_ADC_CHANNEL_ROUNDS_MASK | > IPROC_ADC_CHANNEL_MODE_MASK | > >>> + IPROC_ADC_CHANNEL_ENABLE_MASK; > >>> + regmap_update_bits(adc_priv->regmap, > (IPROC_ADC_CHANNEL_REGCTL1 + > >>> + IPROC_ADC_CHANNEL_OFFSET * channel), > >>> + mask, val); > >>> + > >>> + /* Set the Watermark for a channel */ > >>> + regmap_update_bits(adc_priv->regmap, > (IPROC_ADC_CHANNEL_REGCTL2 + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> channel), > >>> + > >>> IPROC_ADC_CHANNEL_WATERMARK_MASK, > >>> + 0x1); > >>> + > >>> + /* Enable water mark interrupt */ > >>> + regmap_update_bits(adc_priv->regmap, > (IPROC_ADC_CHANNEL_INTERRUPT_MASK + > >>> + IPROC_ADC_CHANNEL_OFFSET * > >>> + channel), > >>> + > >>> IPROC_ADC_CHANNEL_WTRMRK_INTR_MASK, > >>> + > >>> IPROC_ADC_WATER_MARK_INTR_ENABLE); > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, &val); > >>> + > >>> + /* Enable ADC interrupt for a channel */ > >>> + val |= (BIT(channel) << IPROC_ADC_INTR); > >>> + regmap_write(adc_priv->regmap, IPROC_INTERRUPT_MASK, val); > >>> + > >>> + /* > >>> + * There seems to be a very rare issue where writing to this > >>> register > >>> + * does not take effect. To work around the issue we will try > >>> multiple > >>> + * writes. In total we will spend about 10*10 = 100 us > >>> attempting this. > >>> + * Testing has shown that this may loop a few time, but we have > >>> never > >>> + * hit the full count. > >>> + */ > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, > &val_check); > >>> + while (val_check != val) { > >>> + failed_cnt++; > >>> + > >>> + if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS) > >>> + break; > >>> + > >>> + udelay(10); > >>> + regmap_update_bits(adc_priv->regmap, > >>> IPROC_INTERRUPT_MASK, > >>> + IPROC_ADC_INTR_MASK, > >>> + ((0x1 << channel) << > >>> + IPROC_ADC_INTR)); > >>> + > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, > &val_check); > >>> + } > >>> + > >>> + if (failed_cnt) { > >>> + dev_dbg(&indio_dev->dev, > >>> + "IntMask failed (%d times)", failed_cnt); > >>> + if (failed_cnt > IPROC_ADC_INTMASK_RETRY_ATTEMPTS) { > >>> + dev_err(&indio_dev->dev, > >>> + "IntMask set failed. Read will likely > >>> fail."); > >>> + read_len = -EIO; > >>> + goto adc_err; > >>> + }; > >>> + } > >>> + regmap_read(adc_priv->regmap, IPROC_INTERRUPT_MASK, > >>> + &val_check); > >>> + > >>> + if (wait_for_completion_timeout(&adc_priv->completion, > >>> + IPROC_ADC_READ_TIMEOUT) > 0) { > >>> + > >>> + /* Only the lower 16 bits are relevant */ > >>> + *p_adc_data = adc_priv->chan_val & 0xFFFF; > >>> + read_len = sizeof(*p_adc_data); > >>> + > >>> + } else { > >>> + /* > >>> + * We never got the interrupt, something went wrong. > >>> + * Perhaps the interrupt may still be coming, we do not > >>> want > >>> + * that now. Lets disable the ADC interrupt, and clear > >>> the > >>> + * status to put it back in to normal state. > >>> + */ > >>> + read_len = -ETIMEDOUT; > >>> + goto adc_err; > >>> + } > >>> + mutex_unlock(&adc_priv->mutex); > >>> + > >>> + return read_len; > >>> + > >>> +adc_err: > >>> + regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_MASK, > >>> + IPROC_ADC_INTR_MASK, > >>> + ((0x0 << channel) << IPROC_ADC_INTR)); > >>> + > >>> + regmap_update_bits(adc_priv->regmap, IPROC_INTERRUPT_STATUS, > >>> + IPROC_ADC_INTR_MASK, > >>> + ((0x0 << channel) << IPROC_ADC_INTR)); > >>> + > >>> + dev_err(&indio_dev->dev, "Timed out waiting for ADC data!\n"); > >>> + iproc_adc_reg_dump(indio_dev); > >>> + mutex_unlock(&adc_priv->mutex); > >>> + > >>> + return read_len; > >>> +} > >>> + > >>> +static int iproc_adc_enable(struct iio_dev *indio_dev) { > >>> + u32 val; > >>> + u32 channel_id; > >>> + struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); > >>> + int ret; > >>> + > >>> + /* Set i_amux = 3b'000, select channel 0 */ > >>> + ret = regmap_update_bits(adc_priv->regmap, > IPROC_ANALOG_CONTROL, > >>> + IPROC_ADC_CHANNEL_SEL_MASK, 0); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write IPROC_ANALOG_CONTROL %d\n", > >>> ret); > >>> + return ret; > >>> + } > >>> + adc_priv->chan_val = -1; > >>> + > >>> + /* > >>> + * PWR up LDO, ADC, and Band Gap (0 to enable) > >>> + * Also enable ADC controller (set high) > >>> + */ > >>> + ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to read IPROC_REGCTL2 %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + val &= ~(IPROC_ADC_PWR_LDO | IPROC_ADC_PWR_ADC | > >>> + IPROC_ADC_PWR_BG); > >>> + > >>> + ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write IPROC_REGCTL2 %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to read IPROC_REGCTL2 %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + val |= IPROC_ADC_CONTROLLER_EN; > >>> + ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write IPROC_REGCTL2 %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + for (channel_id = 0; channel_id < indio_dev->num_channels; > >>> + channel_id++) { > >>> + ret = regmap_write(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_INTERRUPT_MASK + > >>> + IPROC_ADC_CHANNEL_OFFSET * channel_id, > >>> 0); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write ADC_CHANNEL_INTERRUPT_MASK > >>> %d\n", > >>> + ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = regmap_write(adc_priv->regmap, > >>> + IPROC_ADC_CHANNEL_INTERRUPT_STATUS + > >>> + IPROC_ADC_CHANNEL_OFFSET * channel_id, > >>> 0); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write > >>> ADC_CHANNEL_INTERRUPT_STATUS %d\n", > >>> + ret); > >>> + return ret; > >>> + } > >>> + } > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static void iproc_adc_disable(struct iio_dev *indio_dev) { > >>> + u32 val; > >>> + int ret; > >>> + struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); > >>> + > >>> + ret = regmap_read(adc_priv->regmap, IPROC_REGCTL2, &val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to read IPROC_REGCTL2 %d\n", ret); > >>> + return; > >>> + } > >>> + > >>> + val &= ~IPROC_ADC_CONTROLLER_EN; > >>> + ret = regmap_write(adc_priv->regmap, IPROC_REGCTL2, val); > >>> + if (ret) { > >>> + dev_err(&indio_dev->dev, > >>> + "failed to write IPROC_REGCTL2 %d\n", ret); > >>> + return; > >>> + } > >>> +} > >>> + > >>> +static int iproc_adc_read_raw(struct iio_dev *indio_dev, > >>> + struct iio_chan_spec const *chan, > >>> + int *val, > >>> + int *val2, > >>> + long mask) > >>> +{ > >>> + u16 adc_data; > >>> + int err; > >>> + > >>> + switch (mask) { > >>> + case IIO_CHAN_INFO_RAW: > >>> + err = iproc_adc_do_read(indio_dev, chan->channel, > >>> &adc_data); > >>> + if (err < 0) > >>> + return err; > >>> + *val = adc_data; > >>> + return IIO_VAL_INT; > >>> + case IIO_CHAN_INFO_SCALE: > >>> + switch (chan->type) { > >>> + case IIO_VOLTAGE: > >>> + *val = 1800; > >>> + *val2 = 10; > >>> + return IIO_VAL_FRACTIONAL_LOG2; > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> + default: > >>> + return -EINVAL; > >>> + } > >>> +} > >>> + > >>> +static const struct iio_info iproc_adc_iio_info = { > >>> + .read_raw = &iproc_adc_read_raw, > >>> + .driver_module = THIS_MODULE, > >>> +}; > >>> + > >>> +#define IPROC_ADC_CHANNEL(_index, _id) { \ > >>> + .type = IIO_VOLTAGE, \ > >>> + .indexed = 1, \ > >>> + .channel = _index, \ > >>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > >>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ > >>> + .datasheet_name = _id, \ > >>> +} > >>> + > >>> +static const struct iio_chan_spec iproc_adc_iio_channels[] = { > >>> + IPROC_ADC_CHANNEL(0, "adc0"), > >>> + IPROC_ADC_CHANNEL(1, "adc1"), > >>> + IPROC_ADC_CHANNEL(2, "adc2"), > >>> + IPROC_ADC_CHANNEL(3, "adc3"), > >>> + IPROC_ADC_CHANNEL(4, "adc4"), > >>> + IPROC_ADC_CHANNEL(5, "adc5"), > >>> + IPROC_ADC_CHANNEL(6, "adc6"), > >>> + IPROC_ADC_CHANNEL(7, "adc7"), > >>> +}; > >>> + > >>> +static int iproc_adc_probe(struct platform_device *pdev) { > >>> + struct iproc_adc_priv *adc_priv; > >>> + struct iio_dev *indio_dev = NULL; > >>> + int ret; > >>> + > >>> + indio_dev = devm_iio_device_alloc(&pdev->dev, > >>> + sizeof(*adc_priv)); > >>> + if (!indio_dev) { > >>> + dev_err(&pdev->dev, "failed to allocate iio device\n"); > >>> + return -ENOMEM; > >>> + } > >>> + > >>> + adc_priv = iio_priv(indio_dev); > >>> + platform_set_drvdata(pdev, indio_dev); > >>> + > >>> + mutex_init(&adc_priv->mutex); > >>> + > >>> + init_completion(&adc_priv->completion); > >>> + > >>> + adc_priv->regmap = syscon_regmap_lookup_by_phandle(pdev- > >dev.of_node, > >>> + "adc-syscon"); > >>> + if (IS_ERR(adc_priv->regmap)) { > >>> + dev_err(&pdev->dev, "failed to get handle for tsc > >>> syscon\n"); > >>> + ret = PTR_ERR(adc_priv->regmap); > >>> + return ret; > >>> + } > >>> + > >>> + adc_priv->adc_clk = devm_clk_get(&pdev->dev, "tsc_clk"); > >>> + if (IS_ERR(adc_priv->adc_clk)) { > >>> + dev_err(&pdev->dev, > >>> + "failed getting clock tsc_clk\n"); > >>> + ret = PTR_ERR(adc_priv->adc_clk); > >>> + return ret; > >>> + } > >>> + > >>> + adc_priv->irqno = platform_get_irq(pdev, 0); > >>> + if (adc_priv->irqno <= 0) { > >>> + dev_err(&pdev->dev, "platform_get_irq failed\n"); > >>> + ret = -ENODEV; > >>> + return ret; > >>> + } > >>> + > >>> + ret = regmap_update_bits(adc_priv->regmap, IPROC_REGCTL2, > >>> + IPROC_ADC_AUXIN_SCAN_ENA, 0); > >>> + if (ret) { > >>> + dev_err(&pdev->dev, "failed to write IPROC_REGCTL2 > >>> %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = devm_request_threaded_irq(&pdev->dev, adc_priv->irqno, > >>> + iproc_adc_interrupt_thread, > >>> + iproc_adc_interrupt_handler, > >>> + IRQF_SHARED, "iproc-adc", indio_dev); > >>> + if (ret) { > >>> + dev_err(&pdev->dev, "request_irq error %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = clk_prepare_enable(adc_priv->adc_clk); > >>> + if (ret) { > >>> + dev_err(&pdev->dev, > >>> + "clk_prepare_enable failed %d\n", ret); > >>> + return ret; > >>> + } > >>> + > >>> + ret = iproc_adc_enable(indio_dev); > >>> + if (ret) { > >>> + dev_err(&pdev->dev, "failed to enable adc %d\n", ret); > >>> + goto err_adc_enable; > >>> + } > >>> + > >>> + indio_dev->name = dev_name(&pdev->dev); > >> This name should reflect the part name rather than anything else. > >> Here this is easy as there is only one part name. I'd just put it in > >> directly here. > > > > I thought putting in the part name directly here would hard code and > > looked at the other ADC IIO drivers and found to be using the > > dev_name() call. > Yeah, that's a bit of an oops. > > > > "adc: adc@180a6000" this is the current node name used for adc in .dts > > file so it will take adc@180a6000 as the name and export it to sysfs. > > > > If I have to put the name directly then it should look like "adc" ?? > > or "iproc-static-adc" ? > > then there wouldn't be a direct reference to the device name in .dts > > file. > iproc-static-adc preferred. The fact it is adc is way to generic. > > The idea is that it is a loosely human readable indicator of which of a > set of ADCs > on a board we are looking at. It's not ideal as there might be more than > one of > a type, but better than nothing perhaps. > > The devicetree name is easily found for a device: > Stealing from a recent example posted by Leonard in the thread [was iio: > tmp006: Set correct iio name] how to support multiple instances of same > device > type > > # ssh -t local2222 udevadm info /sys/bus/iio/devices/iio:device0 > DEVNAME=/dev/iio:device0 > DEVTYPE=iio_device > MAJOR=250 > MINOR=0 > OF_COMPATIBLE_0=inv,mpu6500 > OF_COMPATIBLE_N=1 > OF_FULLNAME=/spi/mpu6500@0 > OF_NAME=mpu6500 > SUBSYSTEM=iio Sounds reasonable. Thanks for the info. Will fix and send out the next patch set with all issues fixed. > > > > So I think it's better to keep the name captured from the call > > dev_name(&pdev->dev); > > > > Please suggest whether to put the name directly or keep the existing > > method. > Direct name please. > > > >>> + indio_dev->dev.parent = &pdev->dev; > >>> + indio_dev->dev.of_node = pdev->dev.of_node; > >>> + indio_dev->info = &iproc_adc_iio_info; > >>> + indio_dev->modes = INDIO_DIRECT_MODE; > >>> + indio_dev->channels = iproc_adc_iio_channels; > >>> + indio_dev->num_channels = ARRAY_SIZE(iproc_adc_iio_channels); > >>> + > >>> + ret = iio_device_register(indio_dev); > >>> + if (ret) { > >>> + dev_err(&pdev->dev, "iio_device_register failed:err > >>> %d\n", ret); > >>> + goto err_clk; > >>> + } > >>> + > >>> + return 0; > >>> + > >>> +err_clk: > >>> + iproc_adc_disable(indio_dev); > >>> +err_adc_enable: > >>> + clk_disable_unprepare(adc_priv->adc_clk); > >>> + > >>> + return ret; > >>> +} > >>> + > >>> +static int iproc_adc_remove(struct platform_device *pdev) { > >>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev); > >>> + struct iproc_adc_priv *adc_priv = iio_priv(indio_dev); > >>> + > >>> + iio_device_unregister(indio_dev); > >>> + iproc_adc_disable(indio_dev); > >>> + clk_disable_unprepare(adc_priv->adc_clk); > >>> + > >>> + return 0; > >>> +} > >>> + > >>> +static const struct of_device_id iproc_adc_of_match[] = { > >>> + {.compatible = "brcm,iproc-static-adc", }, > >>> + { }, > >>> +}; > >>> +MODULE_DEVICE_TABLE(of, iproc_adc_of_match); > >>> + > >>> +static struct platform_driver iproc_adc_driver = { > >>> + .probe = iproc_adc_probe, > >>> + .remove = iproc_adc_remove, > >>> + .driver = { > >>> + .name = "iproc-static-adc", > >>> + .of_match_table = of_match_ptr(iproc_adc_of_match), > >>> + }, > >>> +}; > >> 1 blank line is always enough. Here actually, no blank lines is the > >> convention given the connection between the next line and the > >> structure. > > > > Yes, will fix it in the next patch. > > > >>> + > >>> + > >>> +module_platform_driver(iproc_adc_driver); > >>> + > >>> +MODULE_DESCRIPTION("IPROC ADC driver"); > MODULE_AUTHOR("Broadcom"); > >> Module author should be an individual ideally (it's an email address > >> to pester!) Given you are signing off, you are the obvious choice. > >> If several people were involved, you can have multiple MODULE_AUTHOR > >> entries. One person for each one though. > > > > Yes, will fix it in the next patch. > > > >>> +MODULE_LICENSE("GPL v2"); > >>> > >> -- 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
