On Thu, 26 Oct 2017, Jonathan Cameron wrote: some more comments from my side below... > On Wed, 25 Oct 2017 20:16:08 +0200 > Lorenzo Bianconi <lorenzo.bianconi83@xxxxxxxxx> wrote: > > Really minor English comment to start. > add support 'for' UVIS25 sensor > > > > > add support to STMicroelectronics UVIS25 uv sensor > > http://www.st.com/resource/en/datasheet/uvis25.pdf > > > > - continuos mode support > > - i2c support > > - spi support > > - trigger mode support > > - system PM support > > The autoincrement bit in the addresses is a little unusual, but > if feels like this could be neater done using regmap than > by spinning your own infrastructure. > > If there is no nasty side effect in always setting autoincrement > then you should be fine just putting that in write_flag_mask and > read_flag_mask. > > I've suggested an alternative for the interrupt handling. > Not sure it won't end up more hideous than what you have > but worth playing with perhaps. Tryrenable was always > there for triggers to deal with odd race conditions > (originally it was a level interrupt connected to an > edge sensitive pxa27x input on the first board I had ;) > > Might work here at the cost of an extra few reads. > > Jonathan > > > > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > --- > > drivers/iio/light/Kconfig | 22 +++ > > drivers/iio/light/Makefile | 6 + > > drivers/iio/light/st_uvis25.h | 63 +++++++++ > > drivers/iio/light/st_uvis25_buffer.c | 147 +++++++++++++++++++ > > drivers/iio/light/st_uvis25_core.c | 264 +++++++++++++++++++++++++++++++++++ > > drivers/iio/light/st_uvis25_i2c.c | 76 ++++++++++ > > drivers/iio/light/st_uvis25_spi.c | 109 +++++++++++++++ > > 7 files changed, 687 insertions(+) > > create mode 100644 drivers/iio/light/st_uvis25.h > > create mode 100644 drivers/iio/light/st_uvis25_buffer.c > > create mode 100644 drivers/iio/light/st_uvis25_core.c > > create mode 100644 drivers/iio/light/st_uvis25_i2c.c > > create mode 100644 drivers/iio/light/st_uvis25_spi.c > > > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > > index 2356ed9285df..3c5492ec9df6 100644 > > --- a/drivers/iio/light/Kconfig > > +++ b/drivers/iio/light/Kconfig > > @@ -334,6 +334,28 @@ config STK3310 > > Choosing M will build the driver as a module. If so, the module > > will be called stk3310. > > > > +config ST_UVIS25 > > + tristate "STMicroelectronics UVIS25 sensor driver" > > + depends on (I2C || SPI) > > + select IIO_BUFFER > > + select IIO_TRIGGERED_BUFFER > > + select ST_UVIS25_I2C if (I2C) > > + select ST_UVIS25_SPI if (SPI_MASTER) > > + help > > + Say yes here to build support for STMicroelectronics UVIS25 > > + uv sensor > > + > > + To compile this driver as a module, choose M here: the module > > + will be called st_uvis25. > > + > > +config ST_UVIS25_I2C > > + tristate > > + depends on ST_UVIS25 > > + > > +config ST_UVIS25_SPI > > + tristate > > + depends on ST_UVIS25 > > + > > config TCS3414 > > tristate "TAOS TCS3414 digital color sensor" > > depends on I2C > > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > > index fa32fa459e2e..971d316cba5f 100644 > > --- a/drivers/iio/light/Makefile > > +++ b/drivers/iio/light/Makefile > > @@ -32,6 +32,12 @@ obj-$(CONFIG_RPR0521) += rpr0521.o > > obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o > > obj-$(CONFIG_SI1145) += si1145.o > > obj-$(CONFIG_STK3310) += stk3310.o > > + > > +st_uvis25-y := st_uvis25_core.o st_uvis25_buffer.o does the driver name start with S or U w.r.t alphabetic ordering? > Why bother with the split? I'd just have one file for both of > these. There isn't enough code to justify it for readability reasons. > > I thought I was going to find it as a config dependency > (was going to suggest you always built if it was ;) > > > +obj-$(CONFIG_ST_UVIS25) += st_uvis25.o > > +obj-$(CONFIG_ST_UVIS25_I2C) += st_uvis25_i2c.o > > +obj-$(CONFIG_ST_UVIS25_SPI) += st_uvis25_spi.o > > + > > obj-$(CONFIG_TCS3414) += tcs3414.o > > obj-$(CONFIG_TCS3472) += tcs3472.o > > obj-$(CONFIG_TSL2583) += tsl2583.o > > diff --git a/drivers/iio/light/st_uvis25.h b/drivers/iio/light/st_uvis25.h > > new file mode 100644 > > index 000000000000..d444a73e743f > > --- /dev/null > > +++ b/drivers/iio/light/st_uvis25.h > > @@ -0,0 +1,63 @@ > > +/* > > + * STMicroelectronics uvis25 sensor driver > > + * > > + * Copyright 2017 STMicroelectronics Inc. > > + * > > + * Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > + * > > + * Licensed under the GPL-2. > > + */ > > + > > +#ifndef ST_UVIS25_H > > +#define ST_UVIS25_H > > + > > +#define ST_UVIS25_DEV_NAME "uvis25" > > + > > +#include <linux/iio/iio.h> > > + > > +#define ST_UVIS25_RX_MAX_LENGTH 8 > > +#define ST_UVIS25_TX_MAX_LENGTH 8 > > + > > +struct st_uvis25_transfer_buffer { > > + u8 rx_buf[ST_UVIS25_RX_MAX_LENGTH]; > > + u8 tx_buf[ST_UVIS25_TX_MAX_LENGTH] ____cacheline_aligned; > > +}; > > + > > +struct st_uvis25_transfer_function { > > + int (*read)(struct device *dev, u8 addr, int len, u8 *data); > > + int (*write)(struct device *dev, u8 addr, int len, u8 *data); > > +}; > > + > > +/** > > + * struct st_uvis25_hw - ST UVIS25 sensor instance > > + * @dev: Pointer to instance of struct device (I2C or SPI). > > + * @lock: Mutex to protect read and write operations. > > + * @trig: The trigger in use by the driver. > > + * @enabled: Status of the sensor (false->off, true->on). > > + * @irq: Device interrupt line (I2C or SPI). > > + * @tf: Transfer function structure used by I/O operations. > > + * @tb: Transfer buffers used by SPI I/O operations. > > + */ > > +struct st_uvis25_hw { > > + struct device *dev; > > + > > + struct mutex lock; > > + struct iio_trigger *trig; > > + bool enabled; > > + int irq; > > + > > + const struct st_uvis25_transfer_function *tf; > > + struct st_uvis25_transfer_buffer tb; > > +}; > > + > > +extern const struct dev_pm_ops st_uvis25_pm_ops; > > + > > +int st_uvis25_write_with_mask(struct st_uvis25_hw *hw, u8 addr, > > + u8 mask, u8 val); > > +int st_uvis25_set_enable(struct st_uvis25_hw *hw, bool enable); > > +int st_uvis25_probe(struct device *dev, int irq, > > + const struct st_uvis25_transfer_function *tf_ops); > > +int st_uvis25_allocate_buffer(struct iio_dev *iio_dev); > > +int st_uvis25_allocate_trigger(struct iio_dev *iio_dev); > > + > > +#endif /* ST_UVIS25_H */ > > diff --git a/drivers/iio/light/st_uvis25_buffer.c b/drivers/iio/light/st_uvis25_buffer.c > > new file mode 100644 > > index 000000000000..06b95287ca98 > > --- /dev/null > > +++ b/drivers/iio/light/st_uvis25_buffer.c > > @@ -0,0 +1,147 @@ > > +/* > > + * STMicroelectronics uvis25 sensor driver > > + * > > + * Copyright 2017 STMicroelectronics Inc. > > + * > > + * Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > + * > > + * Licensed under the GPL-2. > > + */ > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/device.h> > > +#include <linux/interrupt.h> > > +#include <linux/irqreturn.h> > > +#include <linux/iio/trigger.h> > > +#include <linux/iio/trigger_consumer.h> > > +#include <linux/iio/triggered_buffer.h> > > +#include <linux/iio/buffer.h> > > + > > +#include "st_uvis25.h" > > + > > +#define ST_UVIS25_REG_CTRL3_ADDR 0x22 > > +#define ST_UVIS25_REG_HL_MASK BIT(7) > > +#define ST_UVIS25_REG_STATUS_ADDR 0x27 > > +#define ST_UVIS25_REG_UV_DA_MASK BIT(0) > > + > > +static irqreturn_t st_uvis25_trigger_handler_thread(int irq, void *private) > > +{ > > + struct st_uvis25_hw *hw = private; > > + u8 status; > > + int err; > > + > > + err = hw->tf->read(hw->dev, ST_UVIS25_REG_STATUS_ADDR, sizeof(status), > > + &status); > > + if (err < 0) > > + return IRQ_HANDLED; > > + > > + if (!(status & ST_UVIS25_REG_UV_DA_MASK)) > > + return IRQ_NONE; > > + > > + iio_trigger_poll_chained(hw->trig); > > + > > + return IRQ_HANDLED; > > +} > > + > > +int st_uvis25_allocate_trigger(struct iio_dev *iio_dev) > > +{ > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + bool irq_active_low = false; > > + unsigned long irq_type; > > + int err; > > + > > + irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq)); > > + > > + switch (irq_type) { > > + case IRQF_TRIGGER_HIGH: > > + case IRQF_TRIGGER_RISING: > > + break; > > + case IRQF_TRIGGER_LOW: > > + case IRQF_TRIGGER_FALLING: > > + irq_active_low = true; > > + break; > > + default: maybe just failing is the better/simpler option > > + dev_info(hw->dev, > > + "mode %lx unsupported, using IRQF_TRIGGER_RISING\n", > > + irq_type); > > + irq_type = IRQF_TRIGGER_RISING; > > + break; > > + } > > + > > + err = st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL3_ADDR, > > + ST_UVIS25_REG_HL_MASK, irq_active_low); > > + if (err < 0) > > + return err; > > + > > + err = devm_request_threaded_irq(hw->dev, hw->irq, NULL, > > + st_uvis25_trigger_handler_thread, > > + irq_type | IRQF_ONESHOT, > > + iio_dev->name, hw); > > + if (err) { > > + dev_err(hw->dev, "failed to request trigger irq %d\n", > > + hw->irq); > > + return err; > > + } > > + > > + hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger", > > + iio_dev->name); > > + if (!hw->trig) > > + return -ENOMEM; > > + > > + iio_trigger_set_drvdata(hw->trig, iio_dev); > > + hw->trig->dev.parent = hw->dev; > > + > > + return devm_iio_trigger_register(hw->dev, hw->trig); > > +} > > + > > +static int st_uvis25_buffer_preenable(struct iio_dev *iio_dev) > > +{ > > + return st_uvis25_set_enable(iio_priv(iio_dev), true); > > +} > > + > > +static int st_uvis25_buffer_postdisable(struct iio_dev *iio_dev) > > +{ > > + return st_uvis25_set_enable(iio_priv(iio_dev), false); > > +} > > + > > +static const struct iio_buffer_setup_ops st_uvis25_buffer_ops = { > > + .preenable = st_uvis25_buffer_preenable, > > + .postenable = iio_triggered_buffer_postenable, > > + .predisable = iio_triggered_buffer_predisable, > > + .postdisable = st_uvis25_buffer_postdisable, > > +}; > > + > > +static irqreturn_t st_uvis25_buffer_handler_thread(int irq, void *p) > > +{ > > + u8 buffer[ALIGN(sizeof(u8), sizeof(s64)) + sizeof(s64)]; > > + struct iio_poll_func *pf = p; > > + struct iio_dev *iio_dev = pf->indio_dev; > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + int err; > > + > > + err = hw->tf->read(hw->dev, iio_dev->channels[0].address, sizeof(u8), maybe just use a #define for 0x28 given that there is just one channel > > + buffer); > > + if (err < 0) > > + goto out; > > + > > + iio_push_to_buffers_with_timestamp(iio_dev, buffer, > > + iio_get_time_ns(iio_dev)); > > + > > +out: > > + iio_trigger_notify_done(hw->trig); > > + > > + return IRQ_HANDLED; > > +} > > + > > +int st_uvis25_allocate_buffer(struct iio_dev *iio_dev) > > +{ > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + > > + return devm_iio_triggered_buffer_setup(hw->dev, iio_dev, NULL, > > + st_uvis25_buffer_handler_thread, > > + &st_uvis25_buffer_ops); > > +} > > + > > +MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>"); > > +MODULE_DESCRIPTION("STMicroelectronics uvis25 buffer driver"); > > +MODULE_LICENSE("GPL v2"); > > diff --git a/drivers/iio/light/st_uvis25_core.c b/drivers/iio/light/st_uvis25_core.c > > new file mode 100644 > > index 000000000000..08247092dfff > > --- /dev/null > > +++ b/drivers/iio/light/st_uvis25_core.c > > @@ -0,0 +1,264 @@ > > +/* > > + * STMicroelectronics uvis25 sensor driver > > + * > > + * Copyright 2017 STMicroelectronics Inc. > > + * > > + * Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > + * > > + * Licensed under the GPL-2. > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/device.h> > > +#include <linux/iio/sysfs.h> > > +#include <linux/delay.h> > > +#include <linux/pm.h> > > +#include <linux/interrupt.h> > > + > > +#include "st_uvis25.h" > > + > > +#define ST_UVIS25_REG_WHOAMI_ADDR 0x0f > > +#define ST_UVIS25_REG_WHOAMI_VAL 0xca > > +#define ST_UVIS25_REG_CTRL1_ADDR 0x20 > > +#define ST_UVIS25_REG_ODR_MASK BIT(0) > > +#define ST_UVIS25_REG_BDU_MASK BIT(1) > > +#define ST_UVIS25_REG_CTRL2_ADDR 0x21 > > +#define ST_UVIS25_REG_BOOT_MASK BIT(7) > > + > > +static const struct iio_chan_spec st_uvis25_channels[] = { > > + { > > + .type = IIO_UVINDEX, > > + .address = 0x28, this should use a #define for the register address > > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), > > + .scan_index = 0, > > + .scan_type = { > > + .sign = 'u', > > + .realbits = 8, > > + .storagebits = 8, > > + }, > > + }, > > + IIO_CHAN_SOFT_TIMESTAMP(1), > > +}; > > + > > +static int st_uvis25_check_whoami(struct st_uvis25_hw *hw) > > +{ > > + u8 data; > > + int err; > > + > > + err = hw->tf->read(hw->dev, ST_UVIS25_REG_WHOAMI_ADDR, sizeof(data), > > + &data); > > + if (err < 0) { > > + dev_err(hw->dev, "failed to read whoami register\n"); > > + return err; > > + } > > + > > + if (data != ST_UVIS25_REG_WHOAMI_VAL) { > > + dev_err(hw->dev, "wrong whoami {%02x vs %02x}\n", > > + data, ST_UVIS25_REG_WHOAMI_VAL); > > + return -ENODEV; > > + } > > + > > + return 0; > > +} > > + > > +int st_uvis25_write_with_mask(struct st_uvis25_hw *hw, u8 addr, u8 mask, u8 val) > > +{ > > + u8 data; > > + int err; > > + > > + mutex_lock(&hw->lock); > > This stuff comes for free in regmap... > > > + > > + err = hw->tf->read(hw->dev, addr, sizeof(data), &data); > > + if (err < 0) { > > + dev_err(hw->dev, "failed to read %02x register\n", addr); > > + goto unlock; > > + } > > + > > + data = (data & ~mask) | ((val << __ffs(mask)) & mask); > > + > > + err = hw->tf->write(hw->dev, addr, sizeof(data), &data); > > + if (err < 0) > > + dev_err(hw->dev, "failed to write %02x register\n", addr); > > + > > +unlock: > > + mutex_unlock(&hw->lock); > > + > > + return err < 0 ? err : 0; > > +} > > + > > +int st_uvis25_set_enable(struct st_uvis25_hw *hw, bool enable) > > +{ > > + int err; > > + > > + err = st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL1_ADDR, > > + ST_UVIS25_REG_ODR_MASK, enable); > > + if (err < 0) > > + return err; > > + > > + hw->enabled = enable; > > + > > + return 0; > > +} > > + > > +static int st_uvis25_read_oneshot(struct st_uvis25_hw *hw, u8 addr, int *val) > > +{ > > + u8 data; > > + int err; > > + > > + err = st_uvis25_set_enable(hw, true); > > + if (err < 0) > > + return err; > > + > > + msleep(1500); > > Could drive this off the interrupt rather than disabling the interrupt? > Would that be a little neater (simple completion here). > > > + > > + err = hw->tf->read(hw->dev, addr, sizeof(data), &data); > > + if (err < 0) > > + return err; > > Is there a potential race here if for some reason we managed to > got to sleep for another conversion? I think to be completely > safe you need force an additional read after the disable (or > will that fail to clear the data ready? > > > + > > + st_uvis25_set_enable(hw, false); > > + > > + *val = data; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int st_uvis25_read_raw(struct iio_dev *iio_dev, > > + struct iio_chan_spec const *ch, > > + int *val, int *val2, long mask) > > +{ > > + int ret; > > + > > + ret = iio_device_claim_direct_mode(iio_dev); need a lock here I think as most other drivers do > > + if (ret) > > + return ret; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_PROCESSED: { > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + > > + /* > > + * mask irq line during oneshot read since the sensor > > + * does not export the capability to disable data-ready line > > + * in the register map and it is enabled by default. > > + * If the line is unmasked during read_raw() it will be set > > + * active and never reset since the trigger is disabled > > + */ > > Nasty but well documented... > > I wonder if there is a nicer way to handle this... If we leave it on > the issues is that we end up with the status being checked by the interrupt > handler for the trigger (harmless if a waste of time) then the trigger > being fired (with nothing associated with it). No consumers are attached > so we call notify done for all of them and finally that will result in > a try reenable. You could supply one of those that results in a read > to the device. It think that would always deal with your case of > the data ready getting stuck high.. > > (Not totally sure though as it's been a while since I dealt with a > sensor with this particular issue). > > > + if (hw->irq > 0) > > + disable_irq(hw->irq); > > + ret = st_uvis25_read_oneshot(hw, ch->address, val); > > + if (hw->irq > 0) > > + enable_irq(hw->irq); > > + break; > > + } > > + default: > > + ret = -EINVAL; > > + break; > > + } > > + > > + iio_device_release_direct_mode(iio_dev); > > + > > + return ret; > > +} > > + > > +static const struct iio_info st_uvis25_info = { > > + .read_raw = st_uvis25_read_raw, > > +}; > > + > > +static const unsigned long st_uvis25_scan_masks[] = { 0x1, 0x0 }; > > + > > +static int st_uvis25_init_sensor(struct st_uvis25_hw *hw) > > +{ > > + int err; > > + > > + err = st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL2_ADDR, > > + ST_UVIS25_REG_BOOT_MASK, 1); > > + if (err < 0) > > + return err; > > + > > + msleep(2000); > > + > > + return st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL1_ADDR, > > + ST_UVIS25_REG_BDU_MASK, 1); > > +} > > + > > +int st_uvis25_probe(struct device *dev, int irq, > > + const struct st_uvis25_transfer_function *tf_ops) > > +{ > > + struct st_uvis25_hw *hw; > > + struct iio_dev *iio_dev; > > + int err; > > + > > + iio_dev = devm_iio_device_alloc(dev, sizeof(*hw)); > > + if (!iio_dev) > > + return -ENOMEM; > > + > > + dev_set_drvdata(dev, (void *)iio_dev); > > + > > + hw = iio_priv(iio_dev); > > + hw->dev = dev; > > + hw->irq = irq; > > + hw->tf = tf_ops; > > + > > + mutex_init(&hw->lock); > > + > > + err = st_uvis25_check_whoami(hw); > > + if (err < 0) > > + return err; > > + > > + iio_dev->modes = INDIO_DIRECT_MODE; > > + iio_dev->dev.parent = hw->dev; > > + iio_dev->available_scan_masks = st_uvis25_scan_masks; I wonder if available_scan_masks are needed as there is only one channel... what for? > > + iio_dev->channels = st_uvis25_channels; > > + iio_dev->num_channels = ARRAY_SIZE(st_uvis25_channels); > > + iio_dev->name = ST_UVIS25_DEV_NAME; > > + iio_dev->info = &st_uvis25_info; > > + > > + err = st_uvis25_init_sensor(hw); > > + if (err < 0) > > + return err; > > + > > + if (hw->irq > 0) { > > + err = st_uvis25_allocate_buffer(iio_dev); > > + if (err < 0) > > + return err; > > + > > + err = st_uvis25_allocate_trigger(iio_dev); > > + if (err) > > + return err; > > + } > > + > > + return devm_iio_device_register(hw->dev, iio_dev); > > +} > > +EXPORT_SYMBOL(st_uvis25_probe); > > + > > +static int __maybe_unused st_uvis25_suspend(struct device *dev) > > +{ > > + struct iio_dev *iio_dev = dev_get_drvdata(dev); > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + > > + return st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL1_ADDR, > > + ST_UVIS25_REG_ODR_MASK, 0); > > +} > > + > > +static int __maybe_unused st_uvis25_resume(struct device *dev) > > +{ > > + struct iio_dev *iio_dev = dev_get_drvdata(dev); > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + int err = 0; > > + > > + if (hw->enabled) > > + err = st_uvis25_write_with_mask(hw, ST_UVIS25_REG_CTRL1_ADDR, > > + ST_UVIS25_REG_ODR_MASK, 1); > > + > > + return err; > > +} > > + > > +const struct dev_pm_ops st_uvis25_pm_ops = { > > + SET_SYSTEM_SLEEP_PM_OPS(st_uvis25_suspend, st_uvis25_resume) > > +}; > > +EXPORT_SYMBOL(st_uvis25_pm_ops); > > + > > +MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>"); > > +MODULE_DESCRIPTION("STMicroelectronics uvis25 sensor driver"); > > +MODULE_LICENSE("GPL v2"); > > diff --git a/drivers/iio/light/st_uvis25_i2c.c b/drivers/iio/light/st_uvis25_i2c.c > > new file mode 100644 > > index 000000000000..0d70d866a190 > > --- /dev/null > > +++ b/drivers/iio/light/st_uvis25_i2c.c > > @@ -0,0 +1,76 @@ > > +/* > > + * STMicroelectronics uvis25 i2c driver > > + * > > + * Copyright 2017 STMicroelectronics Inc. > > + * > > + * Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > + * > > + * Licensed under the GPL-2. > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/acpi.h> > > +#include <linux/i2c.h> > > +#include <linux/slab.h> > > + > > +#include "st_uvis25.h" > > + > > +#define I2C_AUTO_INCREMENT 0x80 > > + > > +static int st_uvis25_i2c_read(struct device *dev, u8 addr, int len, u8 *data) > > +{ > > + if (len > 1) > > + addr |= I2C_AUTO_INCREMENT; > > + > > + return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev), > > + addr, len, data); > > +} > > + > > +static int st_uvis25_i2c_write(struct device *dev, u8 addr, int len, u8 *data) > > +{ > > + if (len > 1) > > + addr |= I2C_AUTO_INCREMENT; > > + > > + return i2c_smbus_write_i2c_block_data(to_i2c_client(dev), addr, > > + len, data); > > +} > > + > > +static const struct st_uvis25_transfer_function st_uvis25_transfer_fn = { > > + .read = st_uvis25_i2c_read, > > + .write = st_uvis25_i2c_write, > > +}; > > + > > +static int st_uvis25_i2c_probe(struct i2c_client *client, > > + const struct i2c_device_id *id) > > +{ > > + return st_uvis25_probe(&client->dev, client->irq, > > + &st_uvis25_transfer_fn); > > +} > > + > > +static const struct of_device_id st_uvis25_i2c_of_match[] = { > > + { .compatible = "st,uvis25", }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, st_uvis25_i2c_of_match); > > + > > +static const struct i2c_device_id st_uvis25_i2c_id_table[] = { > > + { ST_UVIS25_DEV_NAME }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(i2c, st_uvis25_i2c_id_table); > > + > > +static struct i2c_driver st_uvis25_driver = { > > + .driver = { > > + .name = "st_uvis25_i2c", > > + .pm = &st_uvis25_pm_ops, > > + .of_match_table = of_match_ptr(st_uvis25_i2c_of_match), > > + }, > > + .probe = st_uvis25_i2c_probe, > > + .id_table = st_uvis25_i2c_id_table, > > +}; > > +module_i2c_driver(st_uvis25_driver); > > + > > +MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>"); > > +MODULE_DESCRIPTION("STMicroelectronics uvis25 i2c driver"); > > +MODULE_LICENSE("GPL v2"); > > diff --git a/drivers/iio/light/st_uvis25_spi.c b/drivers/iio/light/st_uvis25_spi.c > > new file mode 100644 > > index 000000000000..be67d9e7564b > > --- /dev/null > > +++ b/drivers/iio/light/st_uvis25_spi.c > > @@ -0,0 +1,109 @@ > > +/* > > + * STMicroelectronics uvis25 spi driver > > + * > > + * Copyright 2017 STMicroelectronics Inc. > > + * > > + * Lorenzo Bianconi <lorenzo.bianconi@xxxxxx> > > + * > > + * Licensed under the GPL-2. > > + */ > > + > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/spi/spi.h> > > +#include <linux/slab.h> > > + > > +#include "st_uvis25.h" > > + > > +#define SENSORS_SPI_READ 0x80 > > +#define SPI_AUTO_INCREMENT 0x40 > > + > > +static int st_uvis25_spi_read(struct device *dev, u8 addr, int len, u8 *data) > > Hmm.. Maybe a good case for regmap? > > > +{ > > + struct spi_device *spi = to_spi_device(dev); > > + struct iio_dev *iio_dev = spi_get_drvdata(spi); > > + struct st_uvis25_hw *hw = iio_priv(iio_dev); > > + int err; > > + > > + struct spi_transfer xfers[] = { > > + { > > + .tx_buf = hw->tb.tx_buf, > > + .bits_per_word = 8, > > + .len = 1, > > + }, > > + { > > + .rx_buf = hw->tb.rx_buf, > > + .bits_per_word = 8, > > + .len = len, > > + } > > + }; > > + > > + if (len > 1) > > + addr |= SPI_AUTO_INCREMENT; > > + hw->tb.tx_buf[0] = addr | SENSORS_SPI_READ; > > + > > + err = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers)); > > + if (err < 0) > > + return err; > > + > > + memcpy(data, hw->tb.rx_buf, len * sizeof(u8)); > > + > > + return len; > > +} > > + > > +static int st_uvis25_spi_write(struct device *dev, u8 addr, int len, u8 *data) > > +{ > > + struct iio_dev *iio_dev; > > + struct st_uvis25_hw *hw; > > + struct spi_device *spi; > > + > > + if (len >= ST_UVIS25_TX_MAX_LENGTH) > > + return -ENOMEM; > > + > > + spi = to_spi_device(dev); > > + iio_dev = spi_get_drvdata(spi); > > + hw = iio_priv(iio_dev); > Could could just explicitly have the elements of this chain > that are used in local variables. > > hw = iio_priv(spi_get_drvdata(spi)); > > up to you though.. > > + > > + hw->tb.tx_buf[0] = addr; > > + memcpy(&hw->tb.tx_buf[1], data, len); > > + > > + return spi_write(spi, hw->tb.tx_buf, len + 1); > > +} > > + > > +static const struct st_uvis25_transfer_function st_uvis25_transfer_fn = { > > + .read = st_uvis25_spi_read, > > + .write = st_uvis25_spi_write, > > +}; > > + > > +static int st_uvis25_spi_probe(struct spi_device *spi) > > +{ > > + return st_uvis25_probe(&spi->dev, spi->irq, > > + &st_uvis25_transfer_fn); > > +} > > + > > +static const struct of_device_id st_uvis25_spi_of_match[] = { > > + { .compatible = "st,uvis25", }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, st_uvis25_spi_of_match); > > + > > +static const struct spi_device_id st_uvis25_spi_id_table[] = { > > + { ST_UVIS25_DEV_NAME }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(spi, st_uvis25_spi_id_table); > > + > > +static struct spi_driver st_uvis25_driver = { > > + .driver = { > > + .name = "st_uvis25_spi", > > + .pm = &st_uvis25_pm_ops, > > + .of_match_table = of_match_ptr(st_uvis25_spi_of_match), > > + }, > > + .probe = st_uvis25_spi_probe, > > + .id_table = st_uvis25_spi_id_table, > > +}; > > +module_spi_driver(st_uvis25_driver); > > + > > +MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@xxxxxx>"); > > +MODULE_DESCRIPTION("STMicroelectronics uvis25 spi driver"); > > +MODULE_LICENSE("GPL v2"); -- Peter Meerwald-Stadler Mobile: +43 664 24 44 418 -- 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
