Signed-off-by: Kevin Tsai <kt...@capellamicro.com>
---
drivers/iio/light/Kconfig | 11 ++
drivers/iio/light/Makefile | 1 +
drivers/iio/light/cm32181.c | 437 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 449 insertions(+)
create mode 100644 drivers/iio/light/cm32181.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index a022f27..d12b2a0 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -27,6 +27,17 @@ config APDS9300
To compile this driver as a module, choose M here: the
module will be called apds9300.
+config CM32181
+ depends on I2C
+ tristate "CM32181 driver"
+ help
+ Say Y here if you use cm32181.
+ This option enables ambient light sensor using
+ Capella cm32181 device driver.
+
+ To compile this driver as a module, choose M here:
+ the module will be called cm32181.
+
config CM36651
depends on I2C
tristate "CM36651 driver"
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index daa327f..60e35ac 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -5,6 +5,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
obj-$(CONFIG_APDS9300) += apds9300.o
+obj-$(CONFIG_CM32181) += cm32181.o
obj-$(CONFIG_CM36651) += cm36651.o
obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
new file mode 100644
index 0000000..58ab1b2
--- /dev/null
+++ b/drivers/iio/light/cm32181.c
@@ -0,0 +1,437 @@
+/*
+ * Copyright (C) 2013 Capella Microsystems Inc.
+ * Author: Kevin Tsai <kt...@capellamicro.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.
+ */
+
+#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>
+
+/* Registers Address */
+#define CM32181_REG_ADDR_CMD 0x00
+#define CM32181_REG_ADDR_ALS 0x04
+#define CM32181_REG_ADDR_STATUS 0x06
+#define CM32181_REG_ADDR_ID 0x07
+
+/* Number of Configurable Registers */
+#define CM32181_CONF_REG_NUM 0x01
+
+/* CMD register */
+#define CM32181_CMD_ALS_ENABLE 0x00
+#define CM32181_CMD_ALS_DISABLE 0x01
+#define CM32181_CMD_ALS_INT_EN 0x02
+
+#define CM32181_CMD_ALS_IT_SHIFT 6
+#define CM32181_CMD_ALS_IT_MASK (0x0F <<
CM32181_CMD_ALS_IT_SHIFT)
+#define CM32181_CMD_ALS_IT_DEFAULT (0x00 <<
CM32181_CMD_ALS_IT_SHIFT)
+
+#define CM32181_CMD_ALS_SM_SHIFT 11
+#define CM32181_CMD_ALS_SM_MASK (0x03 <<
CM32181_CMD_ALS_SM_SHIFT)
+#define CM32181_CMD_ALS_SM_DEFAULT (0x01 <<
CM32181_CMD_ALS_SM_SHIFT)
+
+#define CM32181_MLUX_PER_BIT 5 /* ALS_SM=01 IT=800ms */
+#define CM32181_MLUX_PER_BIT_BASE_IT 800000 /* Based on IT=800ms */
+#define CM32181_CALIBSCALE_RESOLUTION 1000
+#define MLUX_PER_LUX 1000
+
+enum cm32181_command {
+ CM32181_CMD_READ_RAW_LIGHT,
+};
+
+static const u16 normal_i2c[] = {
+ 0x10, 0x48, I2C_CLIENT_END };
+
+static const u8 cm32181_reg[CM32181_CONF_REG_NUM] = {
+ CM32181_REG_ADDR_CMD,
+};
+
+static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
+static int als_it_value[] = {25000, 50000, 100000, 200000, 400000, 800000};
+
+struct cm32181_chip {
+ struct i2c_client *client;
+ struct mutex lock;
+ u16 conf_regs[CM32181_CONF_REG_NUM];
+ int calibscale;
+};
+
+static int cm32181_read_reg(struct i2c_client *client, u8 reg, u16 *reg_data)
+{
+ s32 ret;
+ int wd;
+
+ wd = 5;
+ while ((ret = i2c_smbus_read_word_data(client, reg)) < 0 &&
+ wd-- > 0)
+ ;
+
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Error in reading Reg.0x%02X\n", reg);
+ } else {
+ if (ret > 0xFFFF)
+ ret = 0xFFFF;
+ *reg_data = (u16)ret;
+ }
+
+ return ret;
+}
+
+static int cm32181_write_reg(struct i2c_client *client, u8 reg, u16 reg_data)
+{
+ int ret;
+ int wd;
+
+ wd = 5;
+ while ((ret = i2c_smbus_write_word_data(client, reg, reg_data)) < 0 &&
+ wd-- > 0)
+ ;
+
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Error in writing 0x%04X to Reg.0x%02X\n",
+ reg_data, reg);
+ }
+
+ return ret;
+}
+
+static int cm32181_reg_init(struct cm32181_chip *cm32181)
+{
+ struct i2c_client *client = cm32181->client;
+ int i, ret;
+
+ cm32181->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_ALS_ENABLE |
+ CM32181_CMD_ALS_IT_DEFAULT | CM32181_CMD_ALS_SM_DEFAULT;
+
+ for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
+ ret = cm32181_write_reg(client, cm32181_reg[i],
+ cm32181->conf_regs[i]);
+ if (ret < 0)
+ return ret;
+ }
+
+ cm32181->calibscale = 1000;
+
+ return 0;
+}
+
+static int cm32181_read_als_it(struct cm32181_chip *cm32181, int *val)
+{
+ u16 als_it;
+ int i;
+
+ als_it = cm32181->conf_regs[CM32181_REG_ADDR_CMD];
+ als_it &= CM32181_CMD_ALS_IT_MASK;
+ als_it >>= CM32181_CMD_ALS_IT_SHIFT;
+ for (i = 0; i < sizeof(als_it_bits)/sizeof(als_it_bits[0]); i++) {
+ if (als_it == als_it_bits[i]) {
+ *val = als_it_value[i];
+ return IIO_VAL_INT;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int cm32181_write_als_it(struct cm32181_chip *cm32181, int val)
+{
+ struct i2c_client *client = cm32181->client;
+ u16 als_it;
+ int ret, i, n;
+
+ n = sizeof(als_it_value)/sizeof(als_it_value[0]);
+ for (i = 0; i < n; i++)
+ if (val <= als_it_value[i])
+ break;
+ if (i >= n && n > 0)
+ i = n-1;
+
+ als_it = als_it_bits[i];
+ als_it <<= CM32181_CMD_ALS_IT_SHIFT;
+
+ mutex_lock(&cm32181->lock);
+ cm32181->conf_regs[CM32181_REG_ADDR_CMD] &=
+ ~CM32181_CMD_ALS_IT_MASK;
+ cm32181->conf_regs[CM32181_REG_ADDR_CMD] |= als_it;
+ ret = cm32181_write_reg(client, CM32181_REG_ADDR_CMD,
+ cm32181->conf_regs[CM32181_REG_ADDR_CMD]);
+ mutex_unlock(&cm32181->lock);
+
+ return ret;
+}
+
+static int cm32181_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct cm32181_chip *cm32181 = iio_priv(indio_dev);
+ struct i2c_client *client = cm32181->client;
+ int ret = -EINVAL;
+ u16 val16 = 0;
+
+ if (chan->type != IIO_LIGHT)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = cm32181_read_reg(client, CM32181_REG_ADDR_ALS, &val16);
+ if (ret >= 0) {
+ ret = IIO_VAL_INT;
+ *val = (int)val16;
+ }
+ break;
+ case IIO_CHAN_INFO_INT_TIME:
+ ret = cm32181_read_als_it(cm32181, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int cm32181_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct cm32181_chip *cm32181 = iio_priv(indio_dev);
+ struct i2c_client *client = cm32181->client;
+ int ret = -EINVAL;
+
+ if (chan->type != IIO_LIGHT)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ ret = cm32181_write_als_it(cm32181, val);
+ if (ret < 0)
+ dev_err(&client->dev, "INT_TIME write failed\n");
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static ssize_t get_lux(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
+ struct i2c_client *client = cm32181->client;
+ unsigned long lux;
+ int ret;
+ int als_it;
+ u16 val;
+
+ ret = cm32181_read_als_it(cm32181, &als_it);
+ if (ret < 0 || als_it == 0)
+ return sprintf(buf, "invalid\n");
+
+ lux = CM32181_MLUX_PER_BIT;
+ lux *= CM32181_MLUX_PER_BIT_BASE_IT;
+ lux /= als_it;
+
+ ret = cm32181_read_reg(client, CM32181_REG_ADDR_ALS, &val);
+ if (ret < 0)
+ return sprintf(buf, "error\n");
+
+ lux *= val;
+ lux *= cm32181->calibscale;
+ lux /= CM32181_CALIBSCALE_RESOLUTION;
+ lux /= MLUX_PER_LUX;
+ return sprintf(buf, "%d\n", (int)lux);
+}
+
+static ssize_t get_it_available(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int i, n, len;
+
+ n = sizeof(als_it_value)/sizeof(als_it_value[0]);
+ for (i = 0, len = 0; i < n; i++)
+ len += sprintf(buf+len, "%d ", (int)als_it_value[i]);
+ return len + sprintf(buf+len, "\n");
+}
+
+static ssize_t get_calibscale(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
+ return sprintf(buf, "%d\n", cm32181->calibscale);
+}
+
+static ssize_t set_calibscale(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct cm32181_chip *cm32181 = iio_priv(dev_get_drvdata(dev));
+ unsigned long lval;
+
+ if (kstrtoul(buf, 10, &lval))
+ return -EINVAL;
+
+ cm32181->calibscale = lval;
+ return count;
+}
+
+static const struct iio_chan_spec cm32181_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .indexed = 0,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_INT_TIME),
+ }
+};
+
+
+static IIO_DEVICE_ATTR(in_illuminance_input, S_IRUGO,
+ get_lux, NULL, 0);
+static IIO_DEVICE_ATTR(in_illuminance_integration_time_available,
+ S_IRUGO, get_it_available, NULL, 0);
+static IIO_DEVICE_ATTR(in_illuminance_calibscale, S_IRUGO | S_IWUSR,
+ get_calibscale, set_calibscale, 0);
+
+static struct attribute *cm32181_attributes[] = {
+ &iio_dev_attr_in_illuminance_input.dev_attr.attr,
+ &iio_dev_attr_in_illuminance_integration_time_available.dev_attr.attr,
+ &iio_dev_attr_in_illuminance_calibscale.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group cm32181_attribute_group = {
+ .attrs = cm32181_attributes
+};
+
+static const struct iio_info cm32181_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &cm32181_read_raw,
+ .write_raw = &cm32181_write_raw,
+ .attrs = &cm32181_attribute_group,
+};
+
+static int cm32181_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cm32181_chip *cm32181;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*cm32181));
+ if (!indio_dev) {
+ dev_err(&client->dev, "devm_iio_device_alloc failed\n");
+ return -ENOMEM;
+ }
+
+ cm32181 = iio_priv(indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+
+ cm32181->client = client;
+ mutex_init(&cm32181->lock);
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->channels = cm32181_channels;
+ indio_dev->num_channels = ARRAY_SIZE(cm32181_channels);
+ indio_dev->info = &cm32181_info;
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = cm32181_reg_init(cm32181);
+ if (ret) {
+ dev_err(&client->dev, "%s: register init failed\n", __func__);
+ goto error_disable_reg;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "%s: regist device failed\n", __func__);
+ goto error_disable_reg;
+ }
+
+ return 0;
+
+error_disable_reg:
+ return ret;
+}
+
+static int cm32181_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ const char *name = NULL;
+ u16 id;
+ int ret;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ ret = cm32181_read_reg(client, CM32181_REG_ADDR_ID, &id);
+ if (ret < 0)
+ return -ENODEV;
+
+ switch (id&0xFF) {
+ case 0x81:
+ name = "cm32181";
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ strlcpy(info->type, name, I2C_NAME_SIZE);
+ return 0;
+}
+
+static int cm32181_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ return 0;
+}
+
+static const struct i2c_device_id cm32181_id[] = {
+ { "cm32181", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, cm32181_id);
+
+static const struct of_device_id cm32181_of_match[] = {
+ { .compatible = "capella,cm32181" },
+ { }
+};
+
+static struct i2c_driver cm32181_driver = {
+ .driver = {
+ .name = "cm32181",
+ .of_match_table = of_match_ptr(cm32181_of_match),
+ .owner = THIS_MODULE,
+ },
+ .id_table = cm32181_id,
+ .probe = cm32181_probe,
+ .remove = cm32181_remove,
+ /* for autodetection */
+ .class = I2C_CLASS_HWMON,
+ .detect = cm32181_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(cm32181_driver);
+
+MODULE_AUTHOR("Kevin Tsai <kt...@capellamicro.com>");
+MODULE_DESCRIPTION("CM32181 ambient light sensor driver");
+MODULE_LICENSE("GPL");
--
1.8.3.1
--
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