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Subject[PATCH 1/1] iio: light: Added CM36672 Proximity Sensor Driver.
Date
Added Vishay Capella CM36672 Proximity Sensor IIO driver.  Support both
ACPI and Device Tree.

Signed-off-by: Kevin Tsai <capellamicro@gmail.com>
---
.../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:
+- 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@capellamicro.com>
+M: Kevin Tsai <capellamicro@gmail.com>
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@caviumnetworks.com>
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
+ 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@gmail.com>
+ *
+ * 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
+#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)
+{
+ *reg &= ~mask;
+ *reg |= (u16)(val << shift);
+}
+
+void cm36672_parse_dt(struct cm36672_chip *chip)
+{
+ 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
+ * help to implement this routine.
+ *
+ * Return: -ENODEV for fail. Otherwise is 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)
+{
+ 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
+
+/**
+ * cm36672_setup_reg() - Initialize sensor to default values.
+ * @chip: pointer of struct cm36672_chip
+ *
+ * Return: 0 for success; otherwise for 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
+
+
+ /* 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);
+ return IRQ_HANDLED;
+ }
+ ev_dir = 0;
+ 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.
+ */
+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;
+ ret = cm36672_read_prx_it(chip, val, val2);
+ break;
+ case IIO_CHAN_INFO_RAW:
+ case IIO_CHAN_INFO_OFFSET:
+ ret = i2c_smbus_read_word_data(
+ chip->client,
+ mask == IIO_CHAN_INFO_RAW ?
+ CM36672_ADDR_PRX : CM36672_ADDR_PRX_CANC);
+ if (ret >= 0) {
+ *val = ret;
+ ret = IIO_VAL_INT;
+ }
+ break;
+ default:
+ ret = -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
+ * @val2: point of integer for micro part
+ * @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]);
+ }
+
+ 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 *
+to_cm36672_prx_attr(struct device_attribute *attr)
+{
+ return container_of(attr, struct cm36672_prx_attribute, dev_attr);
+}
+
+/**
+ * show_prx_attr() - Show event attribute.
+ * @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.
+ * @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");
+
+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) ?
+ &cm36672_info : &cm36672_info_no_irq;
+
+ 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",
+ __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*/
+ 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@gmail.com>");
+MODULE_DESCRIPTION("CM36672 proximity sensor driver");
+MODULE_LICENSE("GPL v2");
--
1.8.3.1
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  Last update: 2016-05-29 03:21    [W:0.053 / U:0.164 seconds]
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