Re: [PATCH 1/1] iio: light: Added CM36672 Proximity Sensor Driver.

From: Peter Meerwald-Stadler
Date: Sun May 29 2016 - 04:55:40 EST

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In reply to: Kevin Tsai: "[PATCH 1/1] iio: light: Added CM36672 Proximity Sensor Driver."
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On Sat, 28 May 2016, Kevin Tsai wrote:

> Added Vishay Capella CM36672 Proximity Sensor IIO driver. Support both
> ACPI and Device Tree.

comments below

> Signed-off-by: Kevin Tsai <capellamicro@xxxxxxxxx>
> ---
> .../devicetree/bindings/i2c/trivial-devices.txt | 1 +
> .../devicetree/bindings/iio/light/cm36672.txt | 54 ++
> MAINTAINERS | 3 +-
> drivers/iio/light/Kconfig | 11 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/cm36672.c | 925 +++++++++++++++++++++
> 6 files changed, 994 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/iio/light/cm36672.txt
> create mode 100644 drivers/iio/light/cm36672.c
>
> diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> index 53987449..a66f052 100644
> --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> @@ -25,6 +25,7 @@ at,24c08 i2c serial eeprom (24cxx)
> atmel,at97sc3204t i2c trusted platform module (TPM)
> capella,cm32181 CM32181: Ambient Light Sensor
> capella,cm3232 CM3232: Ambient Light Sensor
> +capella,cm36672 CM36672: Proximity Sensor
> cirrus,cs42l51 Cirrus Logic CS42L51 audio codec
> dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock
> dallas,ds1338 I2C RTC with 56-Byte NV RAM
> diff --git a/Documentation/devicetree/bindings/iio/light/cm36672.txt b/Documentation/devicetree/bindings/iio/light/cm36672.txt
> new file mode 100644
> index 0000000..2c29f9f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/light/cm36672.txt
> @@ -0,0 +1,54 @@
> +* Vishay Capella CM36672 Proximity Sensor
> +
> +Required properties:
> +- compatible: must be "capella,cm36672"
> +- reg: the I2C address of the device
> +- interrupts: interrupt-specifier for the sole interrupt generated by the device
> +
> +Optionoal properties:

Optional

> +- capella,reg_prx_conf: PS_CONF1 and PS_CONF2 registers
> +- capella,reg_prx_conf3: PS_CONF3 and PS_MS registers
> +- capella,reg_prx_canc: PS cancellation level setting
> +- capella,reg_prx_thdl: PS low interrupt threshold setting
> +- capella,reg_prx_thdh: PS high interrupt threshold setting
> +- capella,name_prx_int_rising: enable/disable rising interrupt
> +- capella,name_prx_int_falling: enable/disable falling interrupt
> +- capella,name_prx_duty: PS duty ratio setting
> +- capella,name_prx_pers: persistence setting
> +- capella,name_prx_it: integration time setting
> +- capella,name_prx_led_current: LED current selection
> +- capella,name_prx_threshold_falling: interrupt falling threshold
> +- capella,name_prx_threshold_rising: interrupt rising threshold
> +
> +Example:
> +
> + i2c_cm36672: i2c-gpio {
> + /* ... */
> +
> + cm36672@60 {
> + compatible = "capella,cm36672";
> + reg = <0x60>;
> + interrupt-parent = <&gpio0>;
> + interrupts = <30 0>;
> +
> + /* Initialized by register */
> + capella,reg_prx_conf = <0x0322>;
> + capella,reg_prx_conf3 = <0x0000>;
> + capella,reg_prx_canc = <0x0000>;
> + capella,reg_prx_thdl = <0x0007>;
> + capella,reg_prx_thdh = <0x000A>;
> +
> + /* Or, initialized by name */
> + capella,name_prx_int_rising = <1>;
> + capella,name_prx_int_falling = <1>;
> + capella,name_prx_duty = <0>;
> + capella,name_prx_pers = <2>;
> + capella,name_prx_it = <1>;
> + capella,name_prx_led_current = <0>;
> + capella,name_prx_threshold_falling = <7>;
> + capella,name_prx_threshold_rising = <10>;
> + };
> +
> + /* ... */
> + };
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ed1229e..e9962a1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2805,10 +2805,11 @@ F: security/commoncap.c
> F: kernel/capability.c
>
> CAPELLA MICROSYSTEMS LIGHT SENSOR DRIVER
> -M: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
> +M: Kevin Tsai <capellamicro@xxxxxxxxx>
> S: Maintained
> F: drivers/iio/light/cm*
> F: Documentation/devicetree/bindings/i2c/trivial-devices.txt
> +F: Documentation/devicetree/bindings/iio/light/cm*.txt
>
> CAVIUM LIQUIDIO NETWORK DRIVER
> M: Derek Chickles <derek.chickles@xxxxxxxxxxxxxxxxxx>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 7c566f5..1fa91ae 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -127,6 +127,17 @@ config CM36651
> To compile this driver as a module, choose M here:
> the module will be called cm36651.
>
> +config CM36672
> + depends on I2C
> + tristate "CM36672 proximity sensor"
> + help
> + Say Y here if you use cm36672.
> + This option enables proximity sensor using Vishay

sensors

> + Capella cm36672 device driver.
> +
> + To compile this driver as a module, choose M here:
> + the module will be called cm36672.
> +
> config GP2AP020A00F
> tristate "Sharp GP2AP020A00F Proximity/ALS sensor"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 6f2a3c6..b155425 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_CM32181) += cm32181.o
> obj-$(CONFIG_CM3232) += cm3232.o
> obj-$(CONFIG_CM3323) += cm3323.o
> obj-$(CONFIG_CM36651) += cm36651.o
> +obj-$(CONFIG_CM36672) += cm36672.o
> obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
> obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
> obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o
> diff --git a/drivers/iio/light/cm36672.c b/drivers/iio/light/cm36672.c
> new file mode 100644
> index 0000000..6dc2633
> --- /dev/null
> +++ b/drivers/iio/light/cm36672.c
> @@ -0,0 +1,925 @@
> +/*
> + * CM36672 Proximity Sensor
> + *
> + * Copyright (C) 2014-2016 Vishay Capella
> + * Author: Kevin Tsai <capellamicro@xxxxxxxxx>
> + *
> + * 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.
> + *
> + * IIO driver for CM36672 (7-bit I2C slave address 0x60).
> + */
> +#include <linux/kernel.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/gpio.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/events.h>
> +
> +#ifdef CONFIG_ACPI
> +#include <linux/acpi.h>
> +#endif
> +
> +/* Sensor registers */
> +#define CM36672_ADDR_RESERVED00 0x00
> +#define CM36672_ADDR_RESERVED01 0x01
> +#define CM36672_ADDR_RESERVED02 0x02

no need to define

> +#define CM36672_ADDR_PRX_CONF 0x03
> +#define CM36672_ADDR_PRX_CONF3 0x04
> +#define CM36672_ADDR_PRX_CANC 0x05
> +#define CM36672_ADDR_PRX_THDL 0x06
> +#define CM36672_ADDR_PRX_THDH 0x07
> +#define CM36672_REGS_NUM 0x08
> +/* Read only registers */
> +#define CM36672_ADDR_PRX 0x08
> +#define CM36672_ADDR_STATUS 0x0B
> +
> +/* RESERVED00 */
> +#define CM36672_RESERVED00_DEFAULT 0x0001
> +
> +/* RESERVED01 */
> +#define CM36672_RESERVED01_DEFAULT 0x0000
> +
> +/* RESERVED02 */
> +#define CM36672_RESERVED02_DEFAULT 0x0000
> +
> +/* PRX_CONF */
> +#define CM36672_PRX_DISABLE 0x0001
> +#define CM36672_PRX_INT_RISING BIT(8)
> +#define CM36672_PRX_INT_FALLING BIT(9)
> +#define CM36672_PRX_INT_MASK (CM36672_PRX_INT_RISING | \
> + CM36672_PRX_INT_FALLING)
> +
> +/* PRX_CONF: duty ratio */
> +#define CM36672_PRX_DR_MASK (BIT(6) | BIT(7))
> +#define CM36672_PRX_DR_SHIFT 6
> +#define CM36672_PRX_DR1 0x0000 /* Duty ratio 1/40 */
> +#define CM36672_PRX_DR2 0x0040 /* Duty ratio 1/80 */
> +#define CM36672_PRX_DR3 0x0080 /* Duty ratio 1/160 */
> +#define CM36672_PRX_DR4 0x00C0 /* Duty ratio 1/320 */
> +
> +/* PRX_CONF: persistence */
> +#define CM36672_PRX_PERS_MASK (BIT(4) | BIT(5))
> +#define CM36672_PRX_PERS_SHIFT 4
> +#define CM36672_PRX_PERS2 0x0010
> +#define CM36672_PRX_PERS3 0x0020
> +#define CM36672_PRX_PERS4 0x0030
> +
> +/* PRX_CONF: integration time */
> +#define CM36672_PRX_IT_MASK (BIT(1) | BIT(2) | BIT(3))
> +#define CM36672_PRX_IT_SHIFT 1
> +#define CM36672_PRX_IT0 0x0000 /* 1T */
> +#define CM36672_PRX_IT1 0x0002 /* 1.5T */
> +#define CM36672_PRX_IT2 0x0004 /* 2T */
> +#define CM36672_PRX_IT3 0x0006 /* 2.5T */
> +#define CM36672_PRX_IT4 0x0008 /* 3T */
> +#define CM36672_PRX_IT5 0x000A /* 3.5T */
> +#define CM36672_PRX_IT6 0x000C /* 4T */
> +#define CM36672_PRX_IT7 0x000E /* 8T */
> +
> +#define CM36672_PRX_CONF_DEFAULT (CM36672_PRX_IT2 | \
> + CM36672_PRX_PERS3)
> +
> +/* PRX_CONF3 */
> +#define CM36672_PRX_LED_I_MASK (BIT(8) | BIT(9) | BIT(10))
> +#define CM36672_PRX_LED_I_SHIFT 8
> +#define CM36672_PRX_LED_I0 0x0000 /* 50mA */
> +#define CM36672_PRX_LED_I1 0x0100 /* 75mA */
> +#define CM36672_PRX_LED_I2 0x0200 /* 100mA */
> +#define CM36672_PRX_LED_I3 0x0300 /* 120mA */
> +#define CM36672_PRX_LED_I4 0x0400 /* 140mA */
> +#define CM36672_PRX_LED_I5 0x0500 /* 160mA */
> +#define CM36672_PRX_LED_I6 0x0600 /* 180mA */
> +#define CM36672_PRX_LED_I7 0x0700 /* 200mA */
> +
> +#define CM36672_PRX_CONF3_DEFAULT CM36672_PRX_LED_I0
> +
> +/* PRX_CANC */
> +#define CM36672_PRX_CANC_DEFAULT 0x0000
> +
> +/* PRX_THDL */
> +#define CM36672_PRX_THDL_DEFAULT 0x0005
> +
> +/* PRX_THDH */
> +#define CM36672_PRX_THDH_DEFAULT 0x000A
> +
> +/* INT_FLAG */
> +#define CM36672_INT_PRX_CLOSE BIT(9)
> +#define CM36672_INT_PRX_AWAY BIT(8)
> +
> +struct cm36672_it_scale {
> + u8 it;
> + int val;
> + int val2;
> +};
> +
> +static const struct cm36672_it_scale cm36672_prx_it_scales[] = {
> + {0, 0, 100}, /* 0.00010 */
> + {1, 0, 150}, /* 0.00015 */
> + {2, 0, 200}, /* 0.00020 */
> + {3, 0, 250}, /* 0.00025 */
> + {4, 0, 300}, /* 0.00030 */
> + {5, 0, 350}, /* 0.00035 */
> + {6, 0, 400}, /* 0.00040 */
> + {7, 0, 800}, /* 0.00080 */
> +};
> +
> +#define CM36672_PRX_INT_TIME_AVAIL \
> + "0.000100 0.000150 0.000200 0.000250 " \
> + "0.000300 0.000350 0.000400 0.000800"
> +
> +static const u16 cm36672_regs_default[] = {
> + CM36672_RESERVED00_DEFAULT,
> + CM36672_RESERVED01_DEFAULT,
> + CM36672_RESERVED02_DEFAULT,
> + CM36672_PRX_CONF_DEFAULT,
> + CM36672_PRX_CONF3_DEFAULT,
> + CM36672_PRX_CANC_DEFAULT,
> + CM36672_PRX_THDL_DEFAULT,
> + CM36672_PRX_THDH_DEFAULT,
> +};
> +
> +struct cm36672_chip {
> + const struct cm36672_platform_data *pdata;
> + struct i2c_client *client;
> + struct mutex lock;
> + u16 regs[CM36672_REGS_NUM];
> +};
> +
> +#define CM36672_DRIVER_NAME "cm36672"
> +
> +#ifdef CONFIG_OF
> +void cm36672_mod_u16(u16 *reg, u16 mask, u8 shift, u16 val)

static

> +{
> + *reg &= ~mask;
> + *reg |= (u16)(val << shift);
> +}
> +
> +void cm36672_parse_dt(struct cm36672_chip *chip)

static

> +{
> + struct device_node *dn = chip->client->dev.of_node;
> + u32 temp_val;
> +
> + /* parse by registers */
> + if (!of_property_read_u32(dn, "capella,reg_prx_conf", &temp_val))
> + chip->regs[CM36672_ADDR_PRX_CONF] = (u16)temp_val;
> + if (!of_property_read_u32(dn, "capella,reg_prx_conf3", &temp_val))
> + chip->regs[CM36672_ADDR_PRX_CONF3] = (u16)temp_val;
> + if (!of_property_read_u32(dn, "capella,reg_prx_canc", &temp_val))
> + chip->regs[CM36672_ADDR_PRX_CANC] = (u16)temp_val;
> + if (!of_property_read_u32(dn, "capella,reg_prx_thdl", &temp_val))
> + chip->regs[CM36672_ADDR_PRX_THDL] = (u16)temp_val;
> + if (!of_property_read_u32(dn, "capella,reg_prx_thdh", &temp_val))
> + chip->regs[CM36672_ADDR_PRX_THDH] = (u16)temp_val;
> +
> + /* parse by name */
> + if (!of_property_read_u32(dn, "capella,name_prx_int_rising", &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_INT_RISING, 0,
> + temp_val ? CM36672_PRX_INT_RISING : 0);
> + if (!of_property_read_u32(dn, "capella,name_prx_int_falling",
> + &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_INT_FALLING, 0,
> + temp_val ? CM36672_PRX_INT_FALLING : 0);
> + if (!of_property_read_u32(dn, "capella,name_prx_duty", &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_DR_MASK,
> + CM36672_PRX_DR_SHIFT,
> + (u16)temp_val);
> + if (!of_property_read_u32(dn, "capella,name_prx_pers", &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_PERS_MASK,
> + CM36672_PRX_PERS_SHIFT,
> + (u16)temp_val);
> + if (!of_property_read_u32(dn, "capella,name_prx_it", &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
> + CM36672_PRX_IT_MASK,
> + CM36672_PRX_IT_SHIFT,
> + (u16)temp_val);
> + if (!of_property_read_u32(dn, "capella,name_prx_led_current",
> + &temp_val))
> + cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF3],
> + CM36672_PRX_LED_I_MASK,
> + CM36672_PRX_LED_I_SHIFT,
> + (u16)temp_val);
> + if (!of_property_read_u32(dn, "capella,name_prx_threshold_rising",
> + &temp_val))
> + chip->regs[CM36672_ADDR_PRX_THDH] = (u16)temp_val;
> + if (!of_property_read_u32(dn, "capella,name_prx_threshold_falling",
> + &temp_val))
> + chip->regs[CM36672_ADDR_PRX_THDL] = (u16)temp_val;
> +}
> +#endif
> +
> +#ifdef CONFIG_ACPI
> +/**
> + * cm36672_acpi_get_cpm_info() - Get CPM object from ACPI
> + * @client: pointer of struct i2c_client.
> + * @obj_name: pointer of ACPI object name.
> + * @count: maximum size of return array.
> + * @vals: pointer of array for return elements.
> + *
> + * Convert ACPI CPM table to array. Special thanks Srinivas Pandruvada's

thanks for

> + * help to implement this routine.
> + *
> + * Return: -ENODEV for fail. Otherwise is number of elements.

Otherwise the number of elements

> + */
> +static int cm36672_acpi_get_cpm_info(struct i2c_client *client, char *obj_name,
> + int count, u64 *vals)
> +{
> + acpi_handle handle;
> + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
> + int i;
> + acpi_status status;
> + union acpi_object *cpm;
> +
> + handle = ACPI_HANDLE(&client->dev);
> + if (!handle)
> + return -ENODEV;
> +
> + status = acpi_evaluate_object(handle, obj_name, NULL, &buffer);
> + if (ACPI_FAILURE(status)) {
> + dev_err(&client->dev, "object %s not found\n", obj_name);
> + return -ENODEV;
> + }
> +
> + cpm = buffer.pointer;
> + for (i = 0; i < cpm->package.count && i < count; ++i) {
> + union acpi_object *elem;
> +
> + elem = &(cpm->package.elements[i]);
> + vals[i] = elem->integer.value;
> + }
> +
> + kfree(buffer.pointer);
> +
> + return i;
> +}
> +
> +void cm36672_parse_acpi(struct cm36672_chip *chip)

static

> +{
> + struct i2c_client *client = chip->client;
> + int cpm_elem_count, i;
> + u64 cpm_elems[20];
> +
> + cpm_elem_count = cm36672_acpi_get_cpm_info(client, "CPM0",
> + ARRAY_SIZE(cpm_elems),
> + cpm_elems);
> +
> + if (cpm_elem_count > 0) {
> + int header_num = 3;
> + int regs_bmp = cpm_elems[2];
> + int reg_num = cpm_elem_count - header_num;
> +
> + if (reg_num > CM36672_REGS_NUM)
> + reg_num = CM36672_REGS_NUM;
> + for (i = 0; i < reg_num; i++)
> + if (regs_bmp & (1 << i))
> + chip->regs[i] =
> + cpm_elems[header_num + i];
> + }
> +

drop newline

> +}
> +
> +#endif
> +
> +/**
> + * cm36672_setup_reg() - Initialize sensor to default values.
> + * @chip: pointer of struct cm36672_chip
> + *
> + * Return: 0 for success; otherwise for error code.

otherwise an error code

> + */
> +static int cm36672_setup_reg(struct cm36672_chip *chip)
> +{
> + int i, ret;
> + u16 prx_conf;
> +
> + memcpy((char *)&chip->regs, (char *)&cm36672_regs_default,
> + sizeof(cm36672_regs_default));
> +
> +#ifdef CONFIG_OF
> + if (chip->client->dev.of_node)
> + cm36672_parse_dt(chip);
> +#endif
> +
> +#ifdef CONFIG_ACPI
> + if (ACPI_HANDLE(&chip->client->dev))
> + cm36672_parse_acpi(chip);
> +#endif
> +

drop newline

> +
> + /* Store regs[CM36672_ADDR_PRX_CONF] */
> + prx_conf = chip->regs[CM36672_ADDR_PRX_CONF];
> +
> + /* Disable INT when initialize registers */
> + chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_INT_RISING;
> + chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_INT_FALLING;
> +
> + for (i = 0; i < CM36672_REGS_NUM; i++) {
> + ret = i2c_smbus_write_word_data(chip->client, i,
> + chip->regs[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* Restore regs[CM36672_ADDR_PRX_CONF] */
> + chip->regs[CM36672_ADDR_PRX_CONF] = prx_conf;
> +
> + /* Force to clear flags */
> + ret = i2c_smbus_read_word_data(chip->client, CM36672_ADDR_STATUS);
> + if (ret < 0) {
> + dev_err(&chip->client->dev,
> + "%s: Failed to read Status register, err= %d\n",
> + __func__, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * cm36672_irq_handler() - Interrupt handling routine.
> + * @irq: irq number
> + * @private: pointer of void
> + *
> + * Return: 0 for success; otherwise for error code.
> + */
> +static irqreturn_t cm36672_irq_handler(int irq, void *private)
> +{
> + struct iio_dev *indio_dev = private;
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + struct i2c_client *client = chip->client;
> + int ev_dir, ret;
> + u64 ev_code;
> +
> + ret = i2c_smbus_read_word_data(chip->client, CM36672_ADDR_STATUS);
> + if (ret < 0) {
> + dev_err(&client->dev,
> + "%s: Data read failed: %d\n", __func__, ret);

'Status read failed' maybe

> + return IRQ_HANDLED;
> + }
> + ev_dir = 0;

use initialization, not assignment

> + if (ret & CM36672_INT_PRX_CLOSE)
> + ev_dir |= IIO_EV_DIR_RISING;
> + if (ret & CM36672_INT_PRX_AWAY)
> + ev_dir |= IIO_EV_DIR_FALLING;
> +
> + ev_code = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
> + IIO_EV_TYPE_THRESH, ev_dir);
> +
> + iio_push_event(indio_dev, ev_code, iio_get_time_ns());
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * cm36672_read_prx_it() - Get the current proximity integration time.
> + * @chip: point of struct cm36672_chip
> + * @val: point of the integer part of integration time
> + * @val2: point of the micro part of integration time
> + *
> + * Return: IIO_VAL_INT_PLUS_MICRO for success; otherwise for error code.

'otherwise an error code', here and elsewhere

> + */
> +static int cm36672_read_prx_it(struct cm36672_chip *chip, int *val, int *val2)
> +{
> + u16 prx_it;
> + int i;
> +
> + prx_it = chip->regs[CM36672_ADDR_PRX_CONF];
> + prx_it &= CM36672_PRX_IT_MASK;
> + prx_it >>= CM36672_PRX_IT_SHIFT;
> + for (i = 0; i < ARRAY_SIZE(cm36672_prx_it_scales); i++) {
> + if (prx_it == cm36672_prx_it_scales[i].it) {
> + *val = cm36672_prx_it_scales[i].val;
> + *val2 = cm36672_prx_it_scales[i].val2;
> + return IIO_VAL_INT_PLUS_MICRO;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +
> +/**
> + * cm36672_write_prx_it() - Set the proximity integration time.
> + * @chip: point of struct cm36672_chip
> + * @val: the integer part of integration time
> + * @val2: the micro part of integration time
> + *
> + * Return: 0 for success; otherwise for error code.
> + */
> +static int cm36672_write_prx_it(struct cm36672_chip *chip, int val, int val2)
> +{
> + struct i2c_client *client = chip->client;
> + u16 prx_it, cmd;
> + int i;
> + s32 ret;
> +
> + for (i = 0; i < ARRAY_SIZE(cm36672_prx_it_scales); i++) {
> + if (val == cm36672_prx_it_scales[i].val &&
> + val2 == cm36672_prx_it_scales[i].val2) {
> +
> + prx_it = cm36672_prx_it_scales[i].it;
> + prx_it <<= CM36672_PRX_IT_SHIFT;
> +
> + cmd = chip->regs[CM36672_ADDR_PRX_CONF];
> + cmd &= ~CM36672_PRX_IT_MASK;
> + cmd |= prx_it;
> + ret = i2c_smbus_write_byte_data(client,
> + CM36672_ADDR_PRX_CONF,
> + cmd);
> + if (ret < 0)
> + return ret;
> + chip->regs[CM36672_ADDR_PRX_CONF] = cmd;
> + return 0;
> + }
> + }
> + return -ERANGE;
> +}
> +
> +/**
> + * cm36672_prx_read() - Read from proximity sensor.
> + * @indio_dev: point of struct iio_dev
> + * @chan: point of struct iio_chan_spec
> + * @val: point of integer
> + * @val2: point of integer
> + * @mask: iio_chan_info_enum
> + *
> + * Return: IIO_VAL type for success; otherwise for error code.
> + */
> +static int cm36672_prx_read(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + if (chan->type != IIO_PROXIMITY)
> + return -EINVAL;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + *val = 0;

not needed, *val is set by read_prx_it()

> + ret = cm36672_read_prx_it(chip, val, val2);

return cm36672_read_prx_it(..);

> + break;
> + case IIO_CHAN_INFO_RAW:
> + case IIO_CHAN_INFO_OFFSET:
> + ret = i2c_smbus_read_word_data(
> + chip->client,
> + mask == IIO_CHAN_INFO_RAW ?

could use chan_spec's .address to avoid this check

> + CM36672_ADDR_PRX : CM36672_ADDR_PRX_CANC);

I'd find
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
a bit cleaner

> + if (ret >= 0) {
> + *val = ret;
> + ret = IIO_VAL_INT;
> + }
> + break;
> + default:
> + ret = -EINVAL;

return -EINVAL;

> + }
> +
> + return ret;
> +}
> +
> +/**
> + * cm36672_prx_write() - Write to proximity sensor.
> + * @indio_dev: point of struct iio_dev
> + * @chan: point of struct iio_chan_spec
> + * @val: point of integer for integer part

not a pointer, a value for write

> + * @val2: point of integer for micro part

not a pointer

> + * @mask: point of iio_chan_info_enum
> + *
> + * Return: Equal or great than 0 for success; otherwise for error code.
> + */
> +static int cm36672_prx_write(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + return cm36672_write_prx_it(chip, val, val2);
> + case IIO_CHAN_INFO_OFFSET:
> + chip->regs[CM36672_ADDR_PRX_CANC] = val;
> + return i2c_smbus_write_word_data(
> + chip->client,
> + CM36672_ADDR_PRX_CANC,
> + chip->regs[CM36672_ADDR_PRX_CANC]);

default:
return -EINVAL;
and drop return below
> + }
> +
> + return -EINVAL;
> +}
> +
> +enum cm36672_prx_attribute_type {
> + CM36672_ATTR_TYPE_THRESH_FALLING_EN,
> + CM36672_ATTR_TYPE_THRESH_FALLING,
> + CM36672_ATTR_TYPE_THRESH_RISING_EN,
> + CM36672_ATTR_TYPE_THRESH_RISING,
> +};
> +
> +struct cm36672_prx_attribute {
> + struct device_attribute dev_attr;
> + enum cm36672_prx_attribute_type type;
> +};
> +
> +static inline struct cm36672_prx_attribute *

no inline, let the compiler figure it out

> +to_cm36672_prx_attr(struct device_attribute *attr)

cm36672_ prefix, maybe rename to cm36672_to_prx_attr

> +{
> + return container_of(attr, struct cm36672_prx_attribute, dev_attr);
> +}
> +
> +/**
> + * show_prx_attr() - Show event attribute.

cm36672_ prefix missing

> + * @dev: point of struct device
> + * @attr: point of struct device_attribute
> + * @buf: point of buffer
> + *
> + * Return: length of buffer; Otherwise for error code.
> + */
> +static ssize_t show_prx_attr(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + struct cm36672_prx_attribute *prx_attr = to_cm36672_prx_attr(attr);
> + u16 val;
> +
> + switch (prx_attr->type) {
> + case CM36672_ATTR_TYPE_THRESH_FALLING_EN:
> + val = (chip->regs[CM36672_ADDR_PRX_CONF] &
> + CM36672_PRX_INT_FALLING) ? 1 : 0;
> + break;
> + case CM36672_ATTR_TYPE_THRESH_RISING_EN:
> + val = (chip->regs[CM36672_ADDR_PRX_CONF] &
> + CM36672_PRX_INT_RISING) ? 1 : 0;
> + break;
> + case CM36672_ATTR_TYPE_THRESH_FALLING:
> + val = chip->regs[CM36672_ADDR_PRX_THDL];
> + break;
> + case CM36672_ATTR_TYPE_THRESH_RISING:
> + val = chip->regs[CM36672_ADDR_PRX_THDH];
> + break;
> + default:
> + return -ENXIO;
> + }
> +
> + return scnprintf(buf, PAGE_SIZE, "%u\n", val);
> +}
> +
> +/**
> + * store_prx_attr() - Store to event attribute.

cm36672_ prefix

> + * @dev: point of struct device
> + * @attr: point of struct device_attribute
> + * @buf: point of buffer
> + * @len: length of buffer
> + *
> + * Return: length of buffer; otherwise for error code.
> + */
> +static ssize_t store_prx_attr(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + struct cm36672_prx_attribute *prx_attr = to_cm36672_prx_attr(attr);
> + u16 val, cmd;
> + int ret;
> +
> + if (kstrtou16(buf, 0, &val))
> + return -EINVAL;
> +
> + mutex_lock(&chip->lock);
> + switch (prx_attr->type) {
> + case CM36672_ATTR_TYPE_THRESH_FALLING_EN:
> + cmd = chip->regs[CM36672_ADDR_PRX_CONF];
> + if (!val)
> + cmd &= ~CM36672_PRX_INT_FALLING;
> + else
> + cmd |= CM36672_PRX_INT_FALLING;
> + ret = i2c_smbus_write_word_data(chip->client,
> + CM36672_ADDR_PRX_CONF,
> + cmd);
> + if (!ret)
> + chip->regs[CM36672_ADDR_PRX_CONF] = cmd;
> + break;
> + case CM36672_ATTR_TYPE_THRESH_RISING_EN:
> + cmd = chip->regs[CM36672_ADDR_PRX_CONF];
> + if (!val)
> + cmd &= ~CM36672_PRX_INT_RISING;
> + else
> + cmd |= CM36672_PRX_INT_RISING;
> + ret = i2c_smbus_write_word_data(chip->client,
> + CM36672_ADDR_PRX_CONF,
> + cmd);
> + if (!ret)
> + chip->regs[CM36672_ADDR_PRX_CONF] = cmd;
> + break;
> + case CM36672_ATTR_TYPE_THRESH_FALLING:
> + if (val > chip->regs[CM36672_ADDR_PRX_THDH]) {
> + ret = -ERANGE;
> + break;
> + }
> + ret = i2c_smbus_write_word_data(chip->client,
> + CM36672_ADDR_PRX_THDL,
> + val);
> + if (!ret)
> + chip->regs[CM36672_ADDR_PRX_THDL] = val;
> + break;
> + case CM36672_ATTR_TYPE_THRESH_RISING:
> + if (val < chip->regs[CM36672_ADDR_PRX_THDL]) {
> + ret = -ERANGE;
> + break;
> + }
> + ret = i2c_smbus_write_word_data(chip->client,
> + CM36672_ADDR_PRX_THDH,
> + val);
> + if (!ret)
> + chip->regs[CM36672_ADDR_PRX_THDH] = val;
> + break;
> + default:
> + ret = -ENXIO;
> + }
> + mutex_unlock(&chip->lock);
> + if (ret < 0)
> + return ret;
> +
> + return len;
> +}
> +
> +#define PRX_ATTR(_name, _mode, _show, _store, _type) \
> + { .dev_attr = __ATTR(_name, _mode, _show, _store), \
> + .type = _type }
> +
> +#define CM36672_PRX_ATTR(_name, _mode, _show, _store, _type) \
> + struct cm36672_prx_attribute cm36672_prx_attr_##_name = \
> + PRX_ATTR(_name, _mode, _show, _store, _type)
> +
> +static CM36672_PRX_ATTR(in_proximity_thresh_falling_en,
> + S_IRUGO | S_IWUSR,
> + show_prx_attr,
> + store_prx_attr,
> + CM36672_ATTR_TYPE_THRESH_FALLING_EN);
> +
> +static CM36672_PRX_ATTR(in_proximity_thresh_rising_en,
> + S_IRUGO | S_IWUSR,
> + show_prx_attr,
> + store_prx_attr,
> + CM36672_ATTR_TYPE_THRESH_RISING_EN);
> +
> +static CM36672_PRX_ATTR(in_proximity_thresh_falling_value,
> + S_IRUGO | S_IWUSR,
> + show_prx_attr,
> + store_prx_attr,
> + CM36672_ATTR_TYPE_THRESH_FALLING);
> +
> +static CM36672_PRX_ATTR(in_proximity_thresh_rising_value,
> + S_IRUGO | S_IWUSR,
> + show_prx_attr,
> + store_prx_attr,
> + CM36672_ATTR_TYPE_THRESH_RISING);
> +
> +static struct attribute *cm36672_prx_event_attributes[] = {
> + &cm36672_prx_attr_in_proximity_thresh_falling_en.dev_attr.attr,
> + &cm36672_prx_attr_in_proximity_thresh_rising_en.dev_attr.attr,
> + &cm36672_prx_attr_in_proximity_thresh_falling_value.dev_attr.attr,
> + &cm36672_prx_attr_in_proximity_thresh_rising_value.dev_attr.attr,
> + NULL,
> +};
> +
> +static struct attribute_group cm36672_prx_event_attribute_group = {
> + .attrs = cm36672_prx_event_attributes
> +};
> +
> +static const struct iio_event_spec cm36672_event_spec[] = {
> + {
> + .type = IIO_EV_TYPE_THRESH,
> + .dir = IIO_EV_DIR_EITHER,
> + .mask_separate = BIT(IIO_EV_INFO_ENABLE),
> + }
> +};
> +
> +static const struct iio_chan_spec cm36672_channels[] = {
> + {
> + .type = IIO_PROXIMITY,
> + .info_mask_separate =
> + BIT(IIO_CHAN_INFO_RAW),
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + BIT(IIO_CHAN_INFO_OFFSET),
> + },
> +};
> +
> +static const struct iio_chan_spec cm36672_channels_no_irq[] = {
> + {
> + .type = IIO_PROXIMITY,
> + .info_mask_separate =
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + BIT(IIO_CHAN_INFO_RAW),
> + BIT(IIO_CHAN_INFO_OFFSET),
> + },
> +};
> +
> +static IIO_CONST_ATTR(in_proximity_integration_time_available,
> + CM36672_PRX_INT_TIME_AVAIL);
> +
> +static struct attribute *cm36672_attributes[] = {
> + &iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group cm36672_attribute_group = {
> + .attrs = cm36672_attributes
> +};
> +
> +static const struct iio_info cm36672_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &cm36672_prx_read,
> + .write_raw = &cm36672_prx_write,
> + .attrs = &cm36672_attribute_group,
> + .event_attrs = &cm36672_prx_event_attribute_group,
> +};
> +
> +static const struct iio_info cm36672_info_no_irq = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &cm36672_prx_read,
> + .write_raw = &cm36672_prx_write,
> + .attrs = &cm36672_attribute_group,
> +};
> +
> +int irq;
> +module_param(irq, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
> +MODULE_PARM_DESC(irq, "irq");

not sure if this is acceptible these days...

> +
> +static int cm36672_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct cm36672_chip *chip;
> + struct iio_dev *indio_dev;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + chip = iio_priv(indio_dev);
> + i2c_set_clientdata(client, indio_dev);
> + chip->client = client;
> +
> + mutex_init(&chip->lock);
> + indio_dev->dev.parent = &client->dev;
> + indio_dev->channels = cm36672_channels;
> + indio_dev->num_channels = ARRAY_SIZE(cm36672_channels);
> + indio_dev->name = CM36672_DRIVER_NAME;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = cm36672_setup_reg(chip);
> + if (ret) {
> + dev_err(&client->dev, "%s: register setup failed\n", __func__);
> + return ret;
> + }
> +
> + if (irq)
> + client->irq = irq;
> + indio_dev->info = (client->irq) ?

parenthesis not needed

> + &cm36672_info : &cm36672_info_no_irq;
> +

this checks for client-irq three times in different forms, maybe use one
check?

> + if (client->irq) {
> + ret = request_threaded_irq(client->irq, NULL,
> + cm36672_irq_handler,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + "cm36672", indio_dev);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: request irq failed\n",
> + __func__);
> + return ret;
> + }
> +
> + /* Enable interrupt if default request*/
> + if (chip->regs[CM36672_ADDR_PRX_CONF] & CM36672_PRX_INT_MASK) {
> + ret = i2c_smbus_write_word_data(chip->client,
> + CM36672_ADDR_PRX_CONF,
> + chip->regs[CM36672_ADDR_PRX_CONF]);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: enable interrupt failed\n",
> + __func__);
> + return ret;
> + }
> + }
> + }
> +
> + ret = iio_device_register(indio_dev);
> + if (ret) {
> + dev_err(&client->dev,
> + "%s: regist device failed\n",

registering

> + __func__);
> + if (client->irq)
> + free_irq(client->irq, indio_dev);
> + }
> +
> + return 0;
> +}
> +
> +static int cm36672_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> +
> + i2c_smbus_write_word_data(
> + chip->client,
> + CM36672_ADDR_PRX_CONF,
> + CM36672_PRX_DISABLE);
> + if (client->irq)
> + free_irq(client->irq, indio_dev);
> + iio_device_unregister(indio_dev);
> + return 0;
> +}
> +
> +static const struct i2c_device_id cm36672_id[] = {
> + { "cm36672", 0 },
> + { }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, cm36672_id);
> +
> +static const struct of_device_id cm36672_of_match[] = {
> + { .compatible = "capella,cm36672" },
> + { }
> +};
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id cm36672_acpi_match[] = {
> + { "CPLM6672", 0},
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(acpi, cm36672_acpi_match);
> +#endif
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int cm36672_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + chip->regs[CM36672_ADDR_PRX_CONF] |= CM36672_PRX_DISABLE;
> + ret = i2c_smbus_write_byte_data(
> + chip->client,
> + CM36672_ADDR_PRX_CONF,
> + chip->regs[CM36672_ADDR_PRX_CONF]);
> + return ret;
> +}
> +
> +static int cm36672_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct cm36672_chip *chip = iio_priv(indio_dev);
> + int i, ret;
> +
> + chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_DISABLE;
> +
> + /* Initialize registers*/

whitespace before */ please

> + for (i = 0; i < CM36672_REGS_NUM; i++) {
> + ret = i2c_smbus_write_word_data(
> + chip->client,
> + i,
> + chip->regs[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops cm36672_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(cm36672_suspend, cm36672_resume)};
> +#endif
> +
> +static struct i2c_driver cm36672_driver = {
> + .driver = {
> + .name = CM36672_DRIVER_NAME,
> + .of_match_table = cm36672_of_match,
> +#ifdef CONFIG_ACPI
> + .acpi_match_table = ACPI_PTR(cm36672_acpi_match),
> +#endif
> + .owner = THIS_MODULE,
> +#ifdef CONFIG_PM_SLEEP
> + .pm = &cm36672_pm_ops,
> +#endif
> + },
> + .id_table = cm36672_id,
> + .probe = cm36672_probe,
> + .remove = cm36672_remove,
> +};
> +
> +module_i2c_driver(cm36672_driver);
> +
> +MODULE_AUTHOR("Kevin Tsai <capellamicro@xxxxxxxxx>");
> +MODULE_DESCRIPTION("CM36672 proximity sensor driver");
> +MODULE_LICENSE("GPL v2");
>

--

Peter Meerwald-Stadler
+43-664-2444418 (mobile)

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