[PATCH V2 1/1] iio: light: Added CM36672 Proximity Sensor Driver.
From: Kevin Tsai
Date: Thu Jun 09 2016 - 05:01:14 EST
Added Vishay Capella CM36672 Proximity Sensor IIO driver. Support both
ACPI and Device Tree.
Signed-off-by: Kevin Tsai <capellamicro@xxxxxxxxx>
---
V2:
Thanks commends from Peter Meerwald-Stadler, Jonathan Cameron, and Linux
Walleij. Updated for the following:
- Remove unused defines.
- Rewrite event registration.
- Remove direct register values in the device tree.
- Rewrite by regmap API.
- Remove irq module parameter.
- Correct cm36672_remove().
.../devicetree/bindings/iio/light/cm36672.txt | 37 +
MAINTAINERS | 4 +-
drivers/iio/light/Kconfig | 11 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/cm36672.c | 820 +++++++++++++++++++++
5 files changed, 871 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/light/cm36672.txt
create mode 100644 drivers/iio/light/cm36672.c
diff --git a/Documentation/devicetree/bindings/iio/light/cm36672.txt b/Documentation/devicetree/bindings/iio/light/cm36672.txt
new file mode 100644
index 0000000..9681d2c
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/cm36672.txt
@@ -0,0 +1,37 @@
+* Vishay Capella CM36672 I2C Proximity sensor
+
+Required properties:
+- compatible: must be capella,cm36672"
+- reg: the I2C slave address, usually 0x60
+- interrupts: interrupt mapping for GPIO IRQ
+
+Optional properties:
+- interrupt-parent: interrupt controller
+- interrupts: interrupt mapping for GPIO IRQ
+- cm36672,prx_led_current: LED current, must be one of the following values:
+ - 0: 50mA
+ - 1: 75mA
+ - 2: 100mA
+ - 3: 120mA
+ - 4: 140mA
+ - 5: 160mA
+ - 6: 180mA
+ - 7: 200mA
+- cm36672,prx_hd: width of proximity sensor output data, must be one of the
+ following values:
+ - 0: 12-bit
+ - 1: 16-bit
+
+Example:
+
+ cm36672@60 {
+ compatible = "capella,cm36672";
+ reg = <0x60>;
+ interrupt-parent = <&gpio0>;
+ interrupts = <30 0>;
+
+ /* cm36672-specific properties */
+ cm36672,prx_led_current = <2>;
+ cm36672,prx_hd = <1>;
+ };
+
diff --git a/MAINTAINERS b/MAINTAINERS
index ed42cb6..9618af4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2822,10 +2822,10 @@ 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*
CAVIUM LIQUIDIO NETWORK DRIVER
M: Derek Chickles <derek.chickles@xxxxxxxxxxxxxxxxxx>
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 7c566f5..cb5052a 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 driver"
+ help
+ Say Y here if you use cm36672.
+ This option enables proximity sensors using Vishay
+ 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..975629f
--- /dev/null
+++ b/drivers/iio/light/cm36672.c
@@ -0,0 +1,820 @@
+/*
+ * 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/regmap.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
+
+#define CM36672_DRIVER_NAME "cm36672"
+#define CM36672_REGMAP_NAME "cm36672_regmap"
+
+/* Sensor registers */
+#define CM36672_ADDR_PRX_CONF 0x03
+#define CM36672_ADDR_PRX_CONF3 0x04
+#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
+
+/* PRX_CONF */
+#define CM36672_PRX_HD_SHIFT 11
+#define CM36672_PRX_HD (1 << CM36672_PRX_HD_SHIFT)
+
+/* PRX_CONF: interrupt */
+#define CM36672_PRX_INT_THDH BIT(8)
+#define CM36672_PRX_INT_THDL BIT(9)
+#define CM36672_PRX_INT_MASK (CM36672_PRX_INT_THDH | \
+ CM36672_PRX_INT_THDL)
+
+/* PRX_CONF: persistence */
+#define CM36672_PRX_PERS_MASK (BIT(4) | BIT(5))
+#define CM36672_PRX_PERS_SHIFT 4
+#define CM36672_PRX_PERS_DISABLE 0
+#define CM36672_PRX_PERS_2 (1 << CM36672_PRX_PERS_SHIFT)
+#define CM36672_PRX_PERS_3 (2 << CM36672_PRX_PERS_SHIFT)
+#define CM36672_PRX_PERS_4 (3 << CM36672_PRX_PERS_SHIFT)
+
+/* PRX_CONF: integration time */
+#define CM36672_PRX_IT_MASK (BIT(1) | BIT(2) | BIT(3))
+#define CM36672_PRX_IT_SHIFT 1
+#define CM36672_PRX_IT_1T 0
+#define CM36672_PRX_IT_1_5T (1 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_2T (2 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_2_5T (3 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_3T (4 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_3_5T (5 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_4T (6 << CM36672_PRX_IT_SHIFT)
+#define CM36672_PRX_IT_8T (7 << CM36672_PRX_IT_SHIFT)
+
+/* 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_I_50MA 0
+#define CM36672_PRX_LED_I_75MA (1 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_100MA (2 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_120MA (3 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_140MA (4 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_160MA (5 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_180MA (6 << CM36672_PRX_LED_I_SHIFT)
+#define CM36672_PRX_LED_I_200MA (7 << CM36672_PRX_LED_I_SHIFT)
+
+/* 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[] = {
+ 0x0001,
+ 0x0000,
+ 0x0000,
+ CM36672_PRX_INT_THDH | CM36672_PRX_INT_THDL |
+ CM36672_PRX_IT_2T | CM36672_PRX_PERS_3,
+ CM36672_PRX_LED_I_100MA,
+ 0x0000,
+ 0x0005,
+ 0x000A,
+};
+
+struct cm36672_chip {
+ const struct cm36672_platform_data *pdata;
+ struct i2c_client *client;
+ struct mutex lock;
+
+ /* regmap fields */
+ struct regmap *regmap;
+ struct regmap_field *reg_prx_int_hi;
+ struct regmap_field *reg_prx_int_lo;
+ struct regmap_field *reg_prx_it;
+
+ u16 regs[CM36672_REGS_NUM];
+};
+
+static const struct reg_field cm36672_reg_field_prx_int_hi =
+ REG_FIELD(CM36672_ADDR_PRX_CONF, 8, 8);
+static const struct reg_field cm36672_reg_field_prx_int_lo =
+ REG_FIELD(CM36672_ADDR_PRX_CONF, 9, 9);
+static const struct reg_field cm36672_reg_field_prx_it =
+ REG_FIELD(CM36672_ADDR_PRX_CONF, 1, 3);
+
+#ifdef CONFIG_OF
+static void cm36672_mod_u16(u16 *reg, u16 mask, u8 shift, u16 val)
+{
+ *reg &= ~mask;
+ *reg |= (u16)(val << shift);
+}
+
+static void cm36672_parse_dt(struct cm36672_chip *chip)
+{
+ struct device_node *dn = chip->client->dev.of_node;
+ u32 temp_val;
+
+ if (!of_property_read_u32(dn, "cm36672,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, "cm36672,prx_hd", &temp_val))
+ cm36672_mod_u16(&chip->regs[CM36672_ADDR_PRX_CONF],
+ CM36672_PRX_HD, CM36672_PRX_HD_SHIFT,
+ (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 to Srinivas Pandruvada's
+ * help to implement this routine.
+ *
+ * Return: -ENODEV for fail. 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;
+}
+
+static void cm36672_parse_acpi(struct cm36672_chip *chip)
+{
+ 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];
+ }
+}
+
+#endif
+
+static int cm36672_regfield_init(struct cm36672_chip *chip)
+{
+ struct device *dev = &chip->client->dev;
+ struct regmap *regmap = chip->regmap;
+
+ chip->reg_prx_int_lo = devm_regmap_field_alloc(dev, regmap,
+ cm36672_reg_field_prx_int_lo);
+ if (IS_ERR(chip->reg_prx_int_lo)) {
+ dev_err(dev, "%s: reg_prx_int_lo init failed\n", __func__);
+ return PTR_ERR(chip->reg_prx_int_lo);
+ }
+
+ chip->reg_prx_int_hi = devm_regmap_field_alloc(dev, regmap,
+ cm36672_reg_field_prx_int_hi);
+ if (IS_ERR(chip->reg_prx_int_hi)) {
+ dev_err(dev, "%s: reg_prx_int_hi init failed\n", __func__);
+ return PTR_ERR(chip->reg_prx_int_hi);
+ }
+
+ chip->reg_prx_it = devm_regmap_field_alloc(dev, regmap,
+ cm36672_reg_field_prx_it);
+ if (IS_ERR(chip->reg_prx_it)) {
+ dev_err(dev, "%s: reg_prx_it init failed\n", __func__);
+ return PTR_ERR(chip->reg_prx_it);
+ }
+
+ return 0;
+}
+
+/**
+ * cm36672_setup_reg() - Initialize sensor to default values.
+ * @chip: pointer of struct cm36672_chip
+ *
+ * Return: 0 for success; otherwise an error code.
+ */
+static int cm36672_setup_reg(struct cm36672_chip *chip)
+{
+ int i, reg, 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
+
+ /* 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_THDH;
+ chip->regs[CM36672_ADDR_PRX_CONF] &= ~CM36672_PRX_INT_THDL;
+
+ for (i = 0; i < CM36672_REGS_NUM; i++) {
+ ret = regmap_write(chip->regmap, 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 = regmap_read(chip->regmap, 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: IRQ_HANDLED.
+ */
+static irqreturn_t cm36672_irq_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct cm36672_chip *chip = iio_priv(indio_dev);
+ s64 timestamp = iio_get_time_ns();
+ int ret, status;
+
+ ret = regmap_read(chip->regmap, CM36672_ADDR_STATUS, &status);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ if (status & CM36672_INT_PRX_CLOSE)
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ timestamp);
+
+ if (status & CM36672_INT_PRX_AWAY)
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ timestamp);
+
+ 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 an error code.
+ */
+static int cm36672_read_prx_it(struct cm36672_chip *chip, int *val, int *val2)
+{
+ int ret, index;
+
+ ret = regmap_field_read(chip->reg_prx_it, &index);
+ if (ret < 0)
+ return ret;
+
+ if (index < 0 || index >= ARRAY_SIZE(cm36672_prx_it_scales))
+ return -EINVAL;
+
+ *val = cm36672_prx_it_scales[index].val;
+ *val2 = cm36672_prx_it_scales[index].val2;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+/**
+ * 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 an error code.
+ */
+static int cm36672_write_prx_it(struct cm36672_chip *chip, int val, int val2)
+{
+ int i;
+
+ 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)
+ return regmap_field_write(chip->reg_prx_it, i);
+
+ return -EINVAL;
+}
+
+/**
+ * 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 an 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:
+ return cm36672_read_prx_it(chip, val, val2);
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_read(chip->regmap, CM36672_ADDR_PRX, val);
+ if (ret < 0)
+ return ret;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * cm36672_prx_write() - Write to proximity sensor.
+ * @indio_dev: point of struct iio_dev
+ * @chan: point of struct iio_chan_spec
+ * @val: integer for integer part
+ * @val2: integer for micro part
+ * @mask: iio_chan_info_enum
+ *
+ * Return: Equal or great than 0 for success; otherwise an 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);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int cm36672_read_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ struct cm36672_chip *chip = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ if (info != IIO_EV_INFO_VALUE)
+ return -EINVAL;
+
+ if (chan->type == IIO_PROXIMITY) {
+ *val2 = 0;
+ if (dir == IIO_EV_DIR_RISING)
+ ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_THDH,
+ val);
+ else if (dir == IIO_EV_DIR_FALLING)
+ ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_THDL,
+ val);
+ }
+
+ if (ret < 0)
+ return ret;
+
+ return IIO_VAL_INT;
+}
+
+static int cm36672_write_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ int reg, ret = 0;
+ int value, max;
+ struct cm36672_chip *chip = iio_priv(indio_dev);
+
+ if (info != IIO_EV_INFO_VALUE)
+ return -EINVAL;
+
+ if (chan->type == IIO_PROXIMITY) {
+ ret = regmap_read(chip->regmap, CM36672_ADDR_PRX_CONF, &value);
+ max = (value & CM36672_PRX_HD) ? 65535:4095;
+ if (val < 0 || val > max)
+ return -EINVAL;
+ if (dir == IIO_EV_DIR_RISING)
+ reg = CM36672_ADDR_PRX_THDH;
+ else if (dir == IIO_EV_DIR_FALLING)
+ reg = CM36672_ADDR_PRX_THDL;
+ else
+ return -EINVAL;
+
+ ret = regmap_write(chip->regmap, reg, val);
+ if (ret < 0)
+ return ret;
+ } else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int cm36672_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct cm36672_chip *chip = iio_priv(indio_dev);
+ int ret, state;
+
+ if (chan->type == IIO_PROXIMITY) {
+ if (dir == IIO_EV_DIR_RISING)
+ ret = regmap_field_read(chip->reg_prx_int_hi, &state);
+ else if (dir == IIO_EV_DIR_FALLING)
+ ret = regmap_field_read(chip->reg_prx_int_lo, &state);
+ else
+ return -EINVAL;
+
+ if (ret)
+ return ret;
+
+ return state;
+ }
+
+ return -EINVAL;
+}
+
+static int cm36672_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ int state)
+{
+ struct cm36672_chip *chip = iio_priv(indio_dev);
+ int ret;
+
+ if (chan->type == IIO_PROXIMITY) {
+ if (dir == IIO_EV_DIR_RISING)
+ ret = regmap_field_write(chip->reg_prx_int_hi, state);
+ else if (dir == IIO_EV_DIR_FALLING)
+ ret = regmap_field_write(chip->reg_prx_int_lo, state);
+ else
+ return -EINVAL;
+
+ if (ret)
+ return ret;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_event_spec cm36672_prx_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ 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),
+ .channel = 0,
+ .indexed = 0,
+ .scan_index = -1,
+ .event_spec = cm36672_prx_event_spec,
+ .num_event_specs = ARRAY_SIZE(cm36672_prx_event_spec),
+ },
+};
+
+static bool cm36672_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ if (reg <= CM36672_ADDR_PRX_THDH)
+ return true;
+ return false;
+}
+
+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,
+ .read_event_value = cm36672_read_event,
+ .write_event_value = cm36672_write_event,
+ .read_event_config = cm36672_read_event_config,
+ .write_event_config = cm36672_write_event_config,
+};
+
+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,
+};
+
+static const struct regmap_config cm36672_regmap_config = {
+ .name = CM36672_REGMAP_NAME,
+ .reg_bits = 8,
+ .val_bits = 16,
+ .writeable_reg = cm36672_is_writeable_reg,
+ .use_single_rw = true,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static int cm36672_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cm36672_chip *chip;
+ struct iio_dev *indio_dev;
+ struct regmap *regmap;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ regmap = devm_regmap_init_i2c(client, &cm36672_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "%s: regmap initialize failed\n",
+ __func__);
+ return PTR_ERR(regmap);
+ }
+
+ chip = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ chip->client = client;
+ chip->regmap = regmap;
+
+ 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_regfield_init(chip);
+ if (ret) {
+ dev_err(&client->dev, "%s: regfield init failed\n", __func__);
+ return ret;
+ }
+
+ ret = cm36672_setup_reg(chip);
+ if (ret) {
+ dev_err(&client->dev, "%s: register setup failed\n", __func__);
+ return ret;
+ }
+
+ if (client->irq) {
+ indio_dev->info = &cm36672_info;
+
+ 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 = regmap_write(chip->regmap, CM36672_ADDR_PRX_CONF,
+ chip->regs[CM36672_ADDR_PRX_CONF]);
+ if (ret) {
+ dev_err(&client->dev,
+ "%s: enable interrupt failed\n",
+ __func__);
+ return ret;
+ }
+ }
+ } else
+ indio_dev->info = &cm36672_info_no_irq;
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&client->dev,
+ "%s: registering device failed\n",
+ __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);
+
+ iio_device_unregister(indio_dev);
+ regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 1);
+ if (client->irq)
+ free_irq(client->irq, 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);
+ struct i2c_client *client = chip->client;
+ int i, ret;
+
+ for (i = 0; i < CM36672_REGS_NUM; i++) {
+ ret = i2c_smbus_read_word_data(client, i);
+ if (ret < 0)
+ return ret;
+ chip->regs[i] = ret;
+ }
+
+ return regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 1);
+}
+
+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);
+ struct i2c_client *client = chip->client;
+ int i, ret;
+
+ for (i = 0; i < CM36672_REGS_NUM; i++) {
+ ret = i2c_smbus_write_word_data(client, i, chip->regs[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ return regmap_update_bits(chip->regmap, CM36672_ADDR_PRX_CONF, 1, 0);
+}
+
+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,
+ .owner = THIS_MODULE,
+ .of_match_table = cm36672_of_match,
+#ifdef CONFIG_ACPI
+ .acpi_match_table = ACPI_PTR(cm36672_acpi_match),
+#endif
+#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");
--
1.8.3.1