On March 18, 2014 9:51:06 PM GMT+00:00, Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx> wrote:
>Add Capella Microsystem CM3218x family Ambient Light Sensor IIO driver.
>This driver will convert raw data to lux value. Default parameters are
>for reference only. It will detect ACPI table to load per-system
>manufacturing
>parameters.
Hi Kevin
Looks good. Wildcards in bindings or driver names are generally a bad idea. Too high a chance of an incompatible matching device.
As such name everything after one part and add additional compatible strings etc.
Otherwise I will want to do a proper review on a bigger screen than my phone but I am pretty much happy.
Jonathan
>
>Signed-off-by: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
>---
> .../devicetree/bindings/i2c/trivial-devices.txt | 1 +
> drivers/iio/light/Kconfig | 11 +
> drivers/iio/light/Makefile | 1 +
>drivers/iio/light/cm3218x.c | 769
>+++++++++++++++++++++
> 4 files changed, 782 insertions(+)
> create mode 100644 drivers/iio/light/cm3218x.c
>
>diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>index 1a1ac2e..29e7eae 100644
>--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
>@@ -17,6 +17,7 @@ at,24c08 i2c serial eeprom (24cxx)
> atmel,24c02 i2c serial eeprom (24cxx)
> atmel,at97sc3204t i2c trusted platform module (TPM)
> capella,cm32181 CM32181: Ambient Light Sensor
>+capella,cm3218x CM3218x: Ambient Light Sensor
> catalyst,24c32 i2c serial eeprom
> dallas,ds1307 64 x 8, Serial, I2C Real-Time Clock
> dallas,ds1338 I2C RTC with 56-Byte NV RAM
>diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
>index d12b2a0..45a22a6 100644
>--- a/drivers/iio/light/Kconfig
>+++ b/drivers/iio/light/Kconfig
>@@ -38,6 +38,17 @@ config CM32181
> To compile this driver as a module, choose M here:
> the module will be called cm32181.
>
>+config CM3218X
>+ depends on I2C
>+ tristate "CM3218x driver"
>+ help
>+ Say Y here if you use cm3218x.
>+ This option enables ambient light sensor using
>+ Capella cm3218x device driver.
>+
>+ To compile this driver as a module, choose M here:
>+ the module will be called cm3218x.
>+
> config CM36651
> depends on I2C
> tristate "CM36651 driver"
>diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
>index 60e35ac..a506c23 100644
>--- a/drivers/iio/light/Makefile
>+++ b/drivers/iio/light/Makefile
>@@ -6,6 +6,7 @@
> obj-$(CONFIG_ADJD_S311) += adjd_s311.o
> obj-$(CONFIG_APDS9300) += apds9300.o
> obj-$(CONFIG_CM32181) += cm32181.o
>+obj-$(CONFIG_CM3218X) += cm3218x.o
> obj-$(CONFIG_CM36651) += cm36651.o
> obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
> obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
>diff --git a/drivers/iio/light/cm3218x.c b/drivers/iio/light/cm3218x.c
>new file mode 100644
>index 0000000..e422f68
>--- /dev/null
>+++ b/drivers/iio/light/cm3218x.c
>@@ -0,0 +1,769 @@
>+/*
>+ * Copyright (C) 2014 Capella Microsystems Inc.
>+ * Author: Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>
>+ *
>+ * 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.
>+ *
>+ * Special thanks Srinivas Pandruvada
><srinivas.pandruvada@xxxxxxxxxxxxxxx>
>+ * help to add ACPI support.
>+ *
>+ */
>+
>+#include <linux/delay.h>
>+#include <linux/err.h>
>+#include <linux/i2c.h>
>+#include <linux/mutex.h>
>+#include <linux/module.h>
>+#include <linux/interrupt.h>
>+#include <linux/regulator/consumer.h>
>+#include <linux/iio/iio.h>
>+#include <linux/iio/sysfs.h>
>+#include <linux/iio/events.h>
>+#include <linux/init.h>
>+#include <linux/acpi.h>
>+
>+/* Registers Address */
>+#define CM3218x_REG_ADDR_CMD 0x00
>+#define CM3218x_REG_ADDR_WH 0x01
>+#define CM3218x_REG_ADDR_WL 0x02
>+#define CM3218x_REG_ADDR_TEST 0x03
>+#define CM3218x_REG_ADDR_ALS 0x04
>+#define CM3218x_REG_ADDR_STATUS 0x06
>+#define CM3218x_REG_ADDR_ID 0x07
>+
>+/* Number of Configurable Registers */
>+#define CM3218x_CONF_REG_NUM 16
>+
>+/* CMD register */
>+#define CM3218x_CMD_ALS_DISABLE 0x01
>+#define CM3218x_CMD_ALS_INT_EN 0x02
>+#define CM3218x_CMD_ALS_THRES_WINDOW 0x04
>+
>+#define CM3218x_CMD_ALS_PERS_SHIFT 4
>+#define CM3218x_CMD_ALS_PERS_MASK (0x03 << CM3218x_CMD_ALS_PERS_SHIFT)
>+#define CM3218x_CMD_ALS_PERS_DEFAULT (0x01 <<
>CM3218x_CMD_ALS_PERS_SHIFT)
>+
>+#define CM3218x_CMD_ALS_IT_SHIFT 6
>+#define CM3218x_CMD_ALS_IT_MASK (0x0F << CM3218x_CMD_ALS_IT_SHIFT)
>+#define CM3218x_CMD_ALS_IT_DEFAULT (0x01 << CM3218x_CMD_ALS_IT_SHIFT)
>+
>+#define CM3218x_CMD_ALS_HS_SHIFT 11
>+#define CM3218x_CMD_ALS_HS_MASK (0x01 << CM3218x_CMD_ALS_HS_SHIFT)
>+#define CM3218x_CMD_ALS_HS_DEFAULT (0x00 << CM3218x_CMD_ALS_HS_SHIFT)
>+
>+#define CM3218x_CMD_DEFAULT (CM3218x_CMD_ALS_THRES_WINDOW |\
>+ CM3218x_CMD_ALS_PERS_DEFAULT |\
>+ CM3218x_CMD_ALS_IT_DEFAULT |\
>+ CM3218x_CMD_ALS_HS_DEFAULT)
>+
>+#define CM3218x_WH_DEFAULT 0xFFFF
>+#define CM3218x_WL_DEFAULT 0x0000
>+
>+#define CM3218x_CALIBSCALE_DEFAULT 100000
>+#define CM3218x_CALIBSCALE_RESOLUTION 100000
>+#define MLUX_PER_LUX 1000
>+#define CM3218x_THRESHOLD_PERCENT 10 /* 10 percent */
>+
>+/* CM3218 Family */
>+#define CM3218_MLUX_PER_BIT_DEFAULT 5 /* Depend on system */
>+#define CM3218_MLUX_PER_BIT_BASE_IT 800000
>+static int CM3218_als_it_bits[] = {0, 1, 2, 3};
>+static int CM3218_als_it_values[] = {100000, 200000, 400000, 800000};
>+
>+/* CM32181 Family */
>+#define CM32181_MLUX_PER_BIT_DEFAULT 5
>+#define CM32181_MLUX_PER_BIT_BASE_IT 800000
>+static int CM32181_als_it_bits[] = {12, 8, 0, 1, 2, 3};
>+static int CM32181_als_it_values[] = {
>+ 25000, 50000, 100000, 200000, 400000, 800000};
>+
>+/* CM32182 Family */
>+#define CM32182_MLUX_PER_BIT_DEFAULT 5
>+#define CM32182_MLUX_PER_BIT_BASE_IT 800000
>+static int CM32182_als_it_bits[] = {12, 8, 0, 1, 2, 3};
>+static int CM32182_als_it_values[] = {
>+ 25000, 50000, 100000, 200000, 400000, 800000};
>+
>+struct cmdev {
>+ u32 family_id;
>+ int int_type;
>+#define INT_TYPE_SMBUS 0
>+#define INT_TYPE_I2C 1
>+ int regs_bmp;
>+ int calibscale;
>+ int mlux_per_bit;
>+ int mlux_per_bit_base_it;
>+ int *als_it_bits;
>+ int *als_it_values;
>+ int num_als_it;
>+};
>+
>+static struct cmdev cm3218 = {
>+ 3218, INT_TYPE_SMBUS, 0x0F, CM3218x_CALIBSCALE_DEFAULT,
>+ CM3218_MLUX_PER_BIT_DEFAULT, CM3218_MLUX_PER_BIT_BASE_IT,
>+ CM3218_als_it_bits, CM3218_als_it_values,
>+ ARRAY_SIZE(CM3218_als_it_bits)};
>+
>+static struct cmdev cm32181 = {
>+ 32181, INT_TYPE_I2C, 0x0F, CM3218x_CALIBSCALE_DEFAULT,
>+ CM32181_MLUX_PER_BIT_DEFAULT, CM32181_MLUX_PER_BIT_BASE_IT,
>+ CM32181_als_it_bits, CM32181_als_it_values,
>+ ARRAY_SIZE(CM32181_als_it_bits)};
>+
>+static struct cmdev cm32182 = {
>+ 32182, INT_TYPE_I2C, 0x0F, CM3218x_CALIBSCALE_DEFAULT,
>+ CM32182_MLUX_PER_BIT_DEFAULT, CM32182_MLUX_PER_BIT_BASE_IT,
>+ CM32182_als_it_bits, CM32182_als_it_values,
>+ ARRAY_SIZE(CM32182_als_it_bits)};
>+
>+struct cm3218x_chip {
>+ struct i2c_client *client;
>+ struct cmdev *cmdev;
>+ struct mutex lock;
>+ u16 conf_regs[CM3218x_CONF_REG_NUM];
>+ int als_raw;
>+};
>+
>+static int cm3218x_get_lux(struct cm3218x_chip *chip);
>+static int cm3218x_threshold_update(struct cm3218x_chip *chip, int
>percent);
>+static int cm3218x_read_als_it(struct cm3218x_chip *chip, int *val2);
>+
>+/**
>+ * cm3218x_read_ara() - Read ARA register
>+ * @cm3218x: pointer of struct cm3218x.
>+ *
>+ * Following SMBus protocol, ARA register is available only when
>interrupt
>+ * event happened. Read it to clean interrupt event. Otherwise,
>other
>+ * device address/registers will be blocked during interrupt event.
>+ *
>+ * Return: 0 for success; otherwise for error code.
>+ */
>+static int cm3218x_read_ara(struct cm3218x_chip *chip)
>+{
>+ struct i2c_client *client = chip->client;
>+ int status;
>+ unsigned short addr;
>+
>+ addr = client->addr;
>+ client->addr = 0x0C;
>+ status = i2c_smbus_read_byte(client);
>+ client->addr = addr;
>+
>+ if (status < 0)
>+ return -ENODEV;
>+
>+ return status;
>+}
>+
>+/**
>+ * cm3218x_interrupt_config() - Enable/Disable CM3218x interrupt
>+ * @cm3218x: pointer of struct cm3218x.
>+ * @enable: 0 to disable; otherwise to enable
>+ *
>+ * Config CM3218x interrupt control bit.
>+ *
>+ * Return: 0 for success; otherwise for error code.
>+ */
>+static int cm3218x_interrupt_config(struct cm3218x_chip *chip, int
>enable)
>+{
>+ struct i2c_client *client = chip->client;
>+ struct cmdev *cmdev = chip->cmdev;
>+ int status;
>+
>+ if (!cmdev)
>+ return -ENODEV;
>+
>+ /* Force to clean interrupt */
>+ if (cmdev->int_type == INT_TYPE_I2C) {
>+ status = i2c_smbus_read_word_data(client,
>+ CM3218x_REG_ADDR_STATUS);
>+ if (status < 0)
>+ cmdev->int_type = INT_TYPE_SMBUS;
>+ }
>+ if (cmdev->int_type == INT_TYPE_SMBUS)
>+ cm3218x_read_ara(chip);
>+
>+ if (enable)
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] |=
>+ CM3218x_CMD_ALS_INT_EN;
>+ else
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] &=
>+ ~CM3218x_CMD_ALS_INT_EN;
>+
>+ status = i2c_smbus_write_word_data(client, CM3218x_REG_ADDR_CMD,
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD]);
>+
>+ if (status < 0)
>+ return -ENODEV;
>+
>+ return status;
>+}
>+
>+/**
>+ * cm3218x_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 cm3218x_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 = NULL;
>+
>+ 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 cpm->package.count;
>+}
>+
>+/**
>+ * cm3218x_reg_init() - Initialize CM3218x registers
>+ * @cm3218x: pointer of struct cm3218x.
>+ *
>+ * Initialize CM3218x ambient light sensor register to default values.
>+ *
>+ Return: 0 for success; otherwise for error code.
>+ */
>+static int cm3218x_reg_init(struct cm3218x_chip *chip)
>+{
>+ struct i2c_client *client = chip->client;
>+ int i;
>+ s32 ret;
>+ int cpm_elem_count;
>+ u64 cpm_elems[20];
>+ struct cmdev *cmdev;
>+
>+ /* Default device */
>+ chip->cmdev = &cm3218;
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] = CM3218x_CMD_DEFAULT;
>+ chip->conf_regs[CM3218x_REG_ADDR_WH] = CM3218x_WH_DEFAULT;
>+ chip->conf_regs[CM3218x_REG_ADDR_WL] = CM3218x_WL_DEFAULT;
>+
>+ /* Disable interrupt */
>+ cm3218x_interrupt_config(chip, 0);
>+
>+ /* Disable Test Mode */
>+ i2c_smbus_write_word_data(client, CM3218x_REG_ADDR_TEST, 0x0000);
>+
>+ /* Disable device */
>+ i2c_smbus_write_word_data(client, CM3218x_REG_ADDR_CMD,
>+ CM3218x_CMD_ALS_DISABLE);
>+
>+ /* Identify device */
>+ ret = i2c_smbus_read_word_data(client, CM3218x_REG_ADDR_ID);
>+ if (ret < 0)
>+ return ret;
>+ switch (ret & 0xFF) {
>+ case 0x18:
>+ cmdev = chip->cmdev = &cm3218;
>+ if (ret & 0x0800)
>+ cmdev->int_type = INT_TYPE_I2C;
>+ else
>+ cmdev->int_type = INT_TYPE_SMBUS;
>+ break;
>+ case 0x81:
>+ cmdev = chip->cmdev = &cm32181;
>+ break;
>+ case 0x82:
>+ cmdev = chip->cmdev = &cm32182;
>+ break;
>+ default:
>+ return -ENODEV;
>+ }
>+
>+ if (ACPI_HANDLE(&client->dev)) {
>+ /* Load from ACPI */
>+ cpm_elem_count = cm3218x_acpi_get_cpm_info(client, "CPM0",
>+ ARRAY_SIZE(cpm_elems),
>+ cpm_elems);
>+ if (cpm_elem_count > 0) {
>+ int header_num = 3;
>+ int reg_num = cpm_elem_count - header_num;
>+
>+ cmdev->regs_bmp = cpm_elems[2];
>+ for (i = 0; i < reg_num; i++)
>+ if (cmdev->regs_bmp & (1<<i))
>+ chip->conf_regs[i] =
>+ cpm_elems[header_num+i];
>+ }
>+
>+ cpm_elem_count = cm3218x_acpi_get_cpm_info(client, "CPM1",
>+ ARRAY_SIZE(cpm_elems),
>+ cpm_elems);
>+ if (cpm_elem_count > 0) {
>+ cmdev->mlux_per_bit = (int)cpm_elems[0] / 100;
>+ cmdev->calibscale = (int)cpm_elems[1];
>+ }
>+ }
>+
>+ /* Force to disable interrupt */
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] &= ~CM3218x_CMD_ALS_INT_EN;
>+
>+ /* Initialize registers*/
>+ for (i = 0; i < CM3218x_CONF_REG_NUM; i++) {
>+ if (cmdev->regs_bmp & (1<<i)) {
>+ ret = i2c_smbus_write_word_data(client, i,
>+ chip->conf_regs[i]);
>+ if (ret < 0)
>+ return ret;
>+ }
>+ }
>+
>+ return 0;
>+}
>+
>+/**
>+ * cm3218x_read_als_it() - Get sensor integration time (ms)
>+ * @cm3218x: pointer of struct cm3218x
>+ * @val2: pointer of int to load the als_it value.
>+ *
>+ * Report the current integartion time by millisecond.
>+ *
>+ * Return: IIO_VAL_INT_PLUS_MICRO for success, otherwise -EINVAL.
>+ */
>+static int cm3218x_read_als_it(struct cm3218x_chip *chip, int *val2)
>+{
>+ struct cmdev *cmdev = chip->cmdev;
>+ u16 als_it;
>+ int i;
>+
>+ als_it = chip->conf_regs[CM3218x_REG_ADDR_CMD];
>+ als_it &= CM3218x_CMD_ALS_IT_MASK;
>+ als_it >>= CM3218x_CMD_ALS_IT_SHIFT;
>+ for (i = 0; i < cmdev->num_als_it; i++) {
>+ if (als_it == cmdev->als_it_bits[i]) {
>+ *val2 = cmdev->als_it_values[i];
>+ return IIO_VAL_INT_PLUS_MICRO;
>+ }
>+ }
>+
>+ return -EINVAL;
>+}
>+
>+/**
>+ * cm3218x_write_als_it() - Write sensor integration time
>+ * @cm3218x: pointer of struct cm3218x.
>+ * @val: integration time by millisecond.
>+ *
>+ * Convert integration time (ms) to sensor value.
>+ *
>+ * Return: i2c_smbus_write_word_data command return value.
>+ */
>+static int cm3218x_write_als_it(struct cm3218x_chip *chip, int val)
>+{
>+ struct i2c_client *client = chip->client;
>+ struct cmdev *cmdev = chip->cmdev;
>+ u16 als_it;
>+ int ret, i;
>+
>+ for (i = 0; i < cmdev->num_als_it; i++)
>+ if (val <= cmdev->als_it_values[i])
>+ break;
>+ if (i >= cmdev->num_als_it)
>+ i = cmdev->num_als_it - 1;
>+
>+ als_it = cmdev->als_it_bits[i];
>+ als_it <<= CM3218x_CMD_ALS_IT_SHIFT;
>+
>+ mutex_lock(&chip->lock);
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] &=
>+ ~CM3218x_CMD_ALS_IT_MASK;
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD] |=
>+ als_it;
>+ ret = i2c_smbus_write_word_data(client, CM3218x_REG_ADDR_CMD,
>+ chip->conf_regs[CM3218x_REG_ADDR_CMD]);
>+ mutex_unlock(&chip->lock);
>+
>+ return ret;
>+}
>+
>+/**
>+ * cm3218x_get_lux() - report current lux value
>+ * @cm3218x: pointer of struct cm3218x.
>+ *
>+ * Convert sensor raw data to lux. It depends on integration
>+ * time and claibscale variable.
>+ *
>+ * Return: Positive value is lux, otherwise is error code.
>+ */
>+static int cm3218x_get_lux(struct cm3218x_chip *chip)
>+{
>+ struct i2c_client *client = chip->client;
>+ struct cmdev *cmdev = chip->cmdev;
>+ int ret;
>+ int als_it;
>+ int lux;
>+ u64 tmp;
>+
>+ /* Calculate mlux per bit based on als_it */
>+ ret = cm3218x_read_als_it(chip, &als_it);
>+ if (ret < 0)
>+ return -EINVAL;
>+ tmp = (__force u64)cmdev->mlux_per_bit;
>+ tmp *= cmdev->mlux_per_bit_base_it;
>+ tmp = div_u64(tmp, als_it);
>+
>+ /* Get als_raw */
>+ if (!(chip->conf_regs[CM3218x_REG_ADDR_CMD] &
>CM3218x_CMD_ALS_INT_EN))
>+ chip->als_raw = i2c_smbus_read_word_data(
>+ client,
>+ CM3218x_REG_ADDR_ALS);
>+ if (chip->als_raw < 0)
>+ return chip->als_raw;
>+
>+ tmp *= chip->als_raw;
>+ tmp *= cmdev->calibscale;
>+ tmp = div_u64(tmp, CM3218x_CALIBSCALE_RESOLUTION);
>+ tmp = div_u64(tmp, MLUX_PER_LUX);
>+
>+ if (tmp > 0xFFFF)
>+ tmp = 0xFFFF;
>+
>+ lux = (int)tmp;
>+ return lux;
>+}
>+
>+static int cm3218x_read_raw(struct iio_dev *indio_dev,
>+ struct iio_chan_spec const *chan,
>+ int *val, int *val2, long mask)
>+{
>+ struct cm3218x_chip *chip = iio_priv(indio_dev);
>+ struct cmdev *cmdev = chip->cmdev;
>+ int ret;
>+
>+ switch (mask) {
>+ case IIO_CHAN_INFO_PROCESSED:
>+ ret = cm3218x_get_lux(chip);
>+ if (ret < 0)
>+ return ret;
>+ *val = ret;
>+ return IIO_VAL_INT;
>+ case IIO_CHAN_INFO_CALIBSCALE:
>+ *val = cmdev->calibscale;
>+ return IIO_VAL_INT;
>+ case IIO_CHAN_INFO_INT_TIME:
>+ *val = 0;
>+ ret = cm3218x_read_als_it(chip, val2);
>+ return ret;
>+ }
>+
>+ return -EINVAL;
>+}
>+
>+static int cm3218x_write_raw(struct iio_dev *indio_dev,
>+ struct iio_chan_spec const *chan,
>+ int val, int val2, long mask)
>+{
>+ struct cm3218x_chip *chip = iio_priv(indio_dev);
>+ struct cmdev *cmdev = chip->cmdev;
>+ int ret;
>+
>+ switch (mask) {
>+ case IIO_CHAN_INFO_CALIBSCALE:
>+ cmdev->calibscale = val;
>+ return val;
>+ case IIO_CHAN_INFO_INT_TIME:
>+ ret = cm3218x_write_als_it(chip, val2);
>+ return ret;
>+ }
>+
>+ return -EINVAL;
>+}
>+
>+/**
>+ * cm3218x_get_it_available() - Get available ALS IT value
>+ * @dev: pointer of struct device.
>+ * @attr: pointer of struct device_attribute.
>+ * @buf: pointer of return string buffer.
>+ *
>+ * Display the available integration time values by millisecond.
>+ *
>+ * Return: string length.
>+ */
>+static ssize_t cm3218x_get_it_available(struct device *dev,
>+ struct device_attribute *attr, char *buf)
>+{
>+ struct cm3218x_chip *chip = iio_priv(dev_to_iio_dev(dev));
>+ struct cmdev *cmdev = chip->cmdev;
>+ int i, len;
>+
>+ for (i = 0, len = 0; i < cmdev->num_als_it; i++)
>+ len += sprintf(buf + len, "0.%06u ", cmdev->als_it_values[i]);
>+ return len + sprintf(buf + len, "\n");
>+}
>+
>+/**
>+ * cm3218x_threshold_update() - Update the threshold registers.
>+ * @dev: pointer of struct cm3218x_chip.
>+ * @percent: +/- percent.
>+ *
>+ * Based on the current ALS value, tupdate the hi and low threshold
>registers.
>+ *
>+ * Return: string length.
>+ */
>+static int cm3218x_threshold_update(struct cm3218x_chip *chip, int
>percent)
>+{
>+ struct i2c_client *client = chip->client;
>+ int ret;
>+ int wh, wl;
>+
>+ ret = chip->als_raw = i2c_smbus_read_word_data(client,
>+ CM3218x_REG_ADDR_ALS);
>+ if (ret < 0)
>+ return ret;
>+
>+ wh = wl = ret;
>+ ret *= percent;
>+ ret /= 100;
>+ if (ret < 1)
>+ ret = 1;
>+ wh += ret;
>+ wl -= ret;
>+ if (wh > 65535)
>+ wh = 65535;
>+ if (wl < 0)
>+ wl = 0;
>+
>+ chip->conf_regs[CM3218x_REG_ADDR_WH] = wh;
>+ ret = i2c_smbus_write_word_data(
>+ client,
>+ CM3218x_REG_ADDR_WH,
>+ chip->conf_regs[CM3218x_REG_ADDR_WH]);
>+ if (ret < 0)
>+ return ret;
>+
>+ chip->conf_regs[CM3218x_REG_ADDR_WL] = wl;
>+ ret = i2c_smbus_write_word_data(
>+ client,
>+ CM3218x_REG_ADDR_WL,
>+ chip->conf_regs[CM3218x_REG_ADDR_WL]);
>+ if (ret < 0)
>+ return ret;
>+
>+ return 0;
>+}
>+
>+/**
>+ * cm3218x_event_handler() - Interrupt handling routine.
>+ * @irq: irq number.
>+ * @private: pointer of void.
>+ *
>+ * Clean interrupt and reset threshold registers.
>+ *
>+ * Return: string length.
>+ */
>+static irqreturn_t cm3218x_event_handler(int irq, void *private)
>+{
>+ struct iio_dev *dev_info = private;
>+ struct cm3218x_chip *chip = iio_priv(dev_info);
>+ int ret;
>+
>+ mutex_lock(&chip->lock);
>+
>+ /* Disable interrupt */
>+ ret = cm3218x_interrupt_config(chip, 0);
>+ if (ret < 0)
>+ goto error_handler_unlock;
>+
>+ /* Update Hi/Lo windows */
>+ ret = cm3218x_threshold_update(chip, CM3218x_THRESHOLD_PERCENT);
>+ if (ret < 0)
>+ goto error_handler_unlock;
>+
>+ /* Enable interrupt */
>+ ret = cm3218x_interrupt_config(chip, 1);
>+ if (ret < 0)
>+ goto error_handler_unlock;
>+
>+ mutex_unlock(&chip->lock);
>+
>+ return IRQ_HANDLED;
>+
>+error_handler_unlock:
>+ mutex_unlock(&chip->lock);
>+ return IRQ_NONE;
>+}
>+
>+static const struct iio_chan_spec cm3218x_channels[] = {
>+ {
>+ .type = IIO_LIGHT,
>+ .info_mask_separate =
>+ BIT(IIO_CHAN_INFO_PROCESSED) |
>+ BIT(IIO_CHAN_INFO_CALIBSCALE) |
>+ BIT(IIO_CHAN_INFO_INT_TIME),
>+ }
>+};
>+
>+static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
>+ S_IRUGO, cm3218x_get_it_available, NULL, 0);
>+
>+static struct attribute *cm3218x_attributes[] = {
>+ &iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
>+ NULL,
>+};
>+
>+static const struct attribute_group cm3218x_attribute_group = {
>+ .attrs = cm3218x_attributes
>+};
>+
>+static const struct iio_info cm3218x_info = {
>+ .driver_module = THIS_MODULE,
>+ .read_raw = &cm3218x_read_raw,
>+ .write_raw = &cm3218x_write_raw,
>+ .attrs = &cm3218x_attribute_group,
>+};
>+
>+static int cm3218x_probe(struct i2c_client *client,
>+ const struct i2c_device_id *id)
>+{
>+ struct cm3218x_chip *chip;
>+ struct iio_dev *indio_dev;
>+ int ret;
>+
>+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
>+ if (!indio_dev) {
>+ dev_err(&client->dev, "devm_iio_device_alloc failed\n");
>+ 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 = cm3218x_channels;
>+ indio_dev->num_channels = ARRAY_SIZE(cm3218x_channels);
>+ indio_dev->info = &cm3218x_info;
>+ if (id && id->name)
>+ indio_dev->name = id->name;
>+ else
>+ indio_dev->name = (char *)dev_name(&client->dev);
>+ indio_dev->modes = INDIO_DIRECT_MODE;
>+
>+ ret = cm3218x_reg_init(chip);
>+ if (ret) {
>+ dev_err(&client->dev,
>+ "%s: register init failed\n",
>+ __func__);
>+ return ret;
>+ }
>+
>+ if (client->irq) {
>+ ret = request_threaded_irq(client->irq,
>+ NULL,
>+ cm3218x_event_handler,
>+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
>+ "cm3218x_event",
>+ indio_dev);
>+
>+ if (ret < 0) {
>+ dev_err(&client->dev, "irq request error %d\n",
>+ -ret);
>+ goto error_disable_int;
>+ }
>+ }
>+
>+ ret = iio_device_register(indio_dev);
>+ if (ret < 0) {
>+ dev_err(&client->dev,
>+ "%s: regist device failed\n",
>+ __func__);
>+ goto error_free_irq;
>+ }
>+
>+ if (client->irq) {
>+ ret = cm3218x_threshold_update(chip, CM3218x_THRESHOLD_PERCENT);
>+ if (ret < 0)
>+ goto error_free_irq;
>+
>+ ret = cm3218x_interrupt_config(chip, 1);
>+ if (ret < 0)
>+ goto error_free_irq;
>+ }
>+
>+ return 0;
>+
>+error_free_irq:
>+ free_irq(client->irq, indio_dev);
>+error_disable_int:
>+ cm3218x_interrupt_config(chip, 0);
>+ return ret;
>+}
>+
>+static int cm3218x_remove(struct i2c_client *client)
>+{
>+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
>+ struct cm3218x_chip *chip = iio_priv(indio_dev);
>+
>+ cm3218x_interrupt_config(chip, 0);
>+ if (client->irq)
>+ free_irq(client->irq, indio_dev);
>+ iio_device_unregister(indio_dev);
>+ return 0;
>+}
>+
>+static const struct i2c_device_id cm3218x_id[] = {
>+ { "cm3218x", 0},
>+ { }
>+};
>+
>+MODULE_DEVICE_TABLE(i2c, cm3218x_id);
>+
>+static const struct of_device_id cm3218x_of_match[] = {
>+ { .compatible = "capella,cm3218x" },
>+ { }
>+};
>+
>+static const struct acpi_device_id cm3218x_acpi_match[] = {
>+ { "CPLM3218", 0},
>+ {},
>+};
>+
>+MODULE_DEVICE_TABLE(acpi, cm3218x_acpi_match);
>+
>+static struct i2c_driver cm3218x_driver = {
>+ .driver = {
>+ .name = "cm3218x",
>+ .acpi_match_table = ACPI_PTR(cm3218x_acpi_match),
>+ .of_match_table = of_match_ptr(cm3218x_of_match),
>+ .owner = THIS_MODULE,
>+ },
>+ .id_table = cm3218x_id,
>+ .probe = cm3218x_probe,
>+ .remove = cm3218x_remove,
>+};
>+
>+module_i2c_driver(cm3218x_driver);
>+
>+MODULE_AUTHOR("Kevin Tsai <ktsai@xxxxxxxxxxxxxxxx>");
>+MODULE_DESCRIPTION("CM3218x ambient light sensor driver");
>+MODULE_LICENSE("GPL");
--
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