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Message-Id: <1375813453-2290-1-git-send-email-ktsai@capellamicro.com>
Date: Tue, 6 Aug 2013 11:24:13 -0700
From: Kevin Tsai <ktsai@...ellamicro.com>
To: Kevin Tsai <ktsai@...ellamicro.com>,
Jonathan Cameron <jic23@....ac.uk>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Peter Meerwald <pmeerw@...erw.net>,
Alexander Holler <holler@...oftware.de>,
srinivas pandruvada <srinivas.pandruvada@...el.com>
Cc: linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
devicetree@...r.kernel.org
Subject: [PATCH 1/1] Added Capella CM3218 Ambient Light Sensor IIO driver.
Signed-off-by: Kevin Tsai <ktsai@...ellamicro.com>
---
drivers/iio/light/Kconfig | 10 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/cm3218.c | 589 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 600 insertions(+)
create mode 100644 drivers/iio/light/cm3218.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 5ef1a39..dd1ea80 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -15,6 +15,16 @@ config ADJD_S311
This driver can also be built as a module. If so, the module
will be called adjd_s311.
+config SENSORS_CM3218
+ tristate "CM3218 Ambient Light Sensor"
+ depends on I2C
+ help
+ Say Y here if you have a Capella Micro CM3218 Ambient Light Sensor.
+
+ To compile this driver as a module, choose M here. This module
+ will be called to 'cm3218'. It will access ALS data via iio sysfs.
+ This is recommended.
+
config SENSORS_LM3533
tristate "LM3533 ambient light sensor"
depends on MFD_LM3533
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 040d9c7..c4ebe37 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -3,6 +3,7 @@
#
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
+obj-$(CONFIG_SENSORS_CM3218) += cm3218.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
obj-$(CONFIG_VCNL4000) += vcnl4000.o
diff --git a/drivers/iio/light/cm3218.c b/drivers/iio/light/cm3218.c
new file mode 100644
index 0000000..1989fbb
--- /dev/null
+++ b/drivers/iio/light/cm3218.c
@@ -0,0 +1,589 @@
+/*
+ * A iio driver for CM3218 Ambient Light Sensor.
+ *
+ * IIO driver for monitoring ambient light intensity in lux.
+ *
+ * Copyright (c) 2013, Capella Microsystems Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#if 0 /* ChromeOS still uses old API */
+#include "../iio.h"
+#include "../sysfs.h"
+#define IIO_DEVICE_ALLOC iio_allocate_device
+#define IIO_DEVICE_FREE iio_free_device
+#else
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#define IIO_DEVICE_ALLOC iio_device_alloc
+#define IIO_DEVICE_FREE iio_device_free
+#endif /* 0 */
+
+/*
+ * SMBus ARA address
+ */
+#define CM3218_ADDR_ARA 0x0C
+
+/*
+ * CM3218 CMD Registers
+ */
+#define CM3218_REG_ADDR_CMD 0x00
+#define CM3218_CMD_ALS_SD 0x0001
+#define CM3218_CMD_ALS_INT_EN 0x0002
+#define CM3218_CMD_ALS_IT_SHIFT 6
+#define CM3218_CMD_ALS_IT_MASK (3 << CM3218_CMD_ALS_IT_SHIFT)
+#define CM3218_CMD_ALS_IT_05T (0 << CM3218_CMD_ALS_IT_SHIFT)
+#define CM3218_CMD_ALS_IT_1T (1 << CM3218_CMD_ALS_IT_SHIFT)
+#define CM3218_CMD_ALS_IT_2T (2 << CM3218_CMD_ALS_IT_SHIFT)
+#define CM3218_CMD_ALS_IT_4T (3 << CM3218_CMD_ALS_IT_SHIFT)
+#define CM3218_DEFAULT_CMD (CM3218_CMD_ALS_IT_1T)
+
+#define CM3218_REG_ADDR_ALS_WH 0x01
+#define CM3218_DEFAULT_ALS_WH 0xFFFF
+
+#define CM3218_REG_ADDR_ALS_WL 0x02
+#define CM3218_DEFAULT_ALS_WL 0x0000
+
+#define CM3218_REG_ADDR_ALS 0x04
+
+#define CM3218_REG_ADDR_STATUS 0x06
+
+#define CM3218_REG_ADDR_ID 0x07
+
+/*
+ * Software Parameters
+ */
+#define CM3218_MAX_CACHE_REGS (0x03+1) /* Reg.0x00 to 0x03 */
+
+/*
+ * Features
+ */
+#define CM3218_DEBUG
+
+static const unsigned short normal_i2c[] = {
+ 0x10, 0x48, I2C_CLIENT_END };
+
+struct cm3218_chip {
+ struct i2c_client *client;
+ struct mutex lock;
+ unsigned int lensfactor;
+ bool suspended;
+ u16 reg_cache[CM3218_MAX_CACHE_REGS];
+};
+
+static int cm3218_read_ara(struct i2c_client *client)
+{
+ int status;
+ unsigned short addr;
+
+ addr = client->addr;
+ client->addr = CM3218_ADDR_ARA;
+ status = i2c_smbus_read_byte(client);
+ client->addr = addr;
+
+ if (status < 0)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int cm3218_write(struct i2c_client *client, u8 reg, u16 value)
+{
+ int ret;
+ struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
+
+#ifdef CM3218_DEBUG
+ dev_err(&client->dev,
+ "Write to device register 0x%02X with 0x%04X\n", reg, value);
+#endif /* CM3218_DEBUG */
+ ret = i2c_smbus_write_word_data(client, reg, value);
+ if (ret) {
+ dev_err(&client->dev, "Write to device fails: 0x%x\n", ret);
+ } else {
+ /* Update cache */
+ if (reg < CM3218_MAX_CACHE_REGS)
+ chip->reg_cache[reg] = value;
+ }
+
+ return ret;
+}
+
+static int cm3218_read(struct i2c_client *client, u8 reg)
+{
+ int status;
+ struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
+
+ if (reg < CM3218_MAX_CACHE_REGS) {
+ status = chip->reg_cache[reg];
+ } else {
+ status = i2c_smbus_read_word_data(client, reg);
+ if (status < 0) {
+ dev_err(&client->dev,
+ "Error in reading Reg.0x%02X\n", reg);
+ return status;
+ }
+#ifdef CM3218_DEBUG
+ dev_err(&client->dev,
+ "Read from device register 0x%02X = 0x%04X\n",
+ reg, status);
+#endif /* CM3218_DEBUG */
+ }
+
+ return status;
+}
+
+static int cm3218_read_sensor_input(struct i2c_client *client)
+{
+ int status;
+
+ status = cm3218_read(client, CM3218_REG_ADDR_ALS);
+ if (status < 0)
+ return status;
+
+ dev_vdbg(&client->dev, "lux = %u\n", status);
+
+ return status;
+}
+
+static int cm3218_read_lux(struct i2c_client *client, int *lux)
+{
+ struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
+ int lux_data;
+
+ lux_data = cm3218_read_sensor_input(client);
+
+ if (lux_data < 0)
+ return lux_data;
+
+ *lux = lux_data * chip->lensfactor;
+ *lux /= 1000;
+ return 0;
+}
+
+/* Sysfs interface */
+/* lensfactor */
+static ssize_t show_lensfactor(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n", chip->lensfactor);
+}
+
+static ssize_t store_lensfactor(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ unsigned long lval;
+
+ if (kstrtoul(buf, 10, &lval))
+ return -EINVAL;
+
+ mutex_lock(&chip->lock);
+ chip->lensfactor = lval;
+ mutex_unlock(&chip->lock);
+
+ return count;
+}
+
+static ssize_t get_sensor_data(struct device *dev, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+ int value = 0;
+ int status;
+
+ mutex_lock(&chip->lock);
+ if (chip->suspended) {
+ mutex_unlock(&chip->lock);
+ return -EBUSY;
+ }
+
+ status = cm3218_read_lux(client, &value);
+
+ if (status < 0) {
+ dev_err(&client->dev, "Error in Reading data");
+ mutex_unlock(&chip->lock);
+ return status;
+ }
+
+ mutex_unlock(&chip->lock);
+
+ return sprintf(buf, "%d\n", value);
+}
+
+
+/* Read lux */
+static ssize_t show_lux(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ return get_sensor_data(dev, buf);
+}
+
+#ifdef CM3218_DEBUG
+/* windows_high */
+static ssize_t show_cmd(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+ int status;
+
+ status = cm3218_read(client, CM3218_REG_ADDR_CMD);
+ if (status < 0) {
+ dev_err(dev, "Error in getting CM3218_REG_ADDR_CMD\n");
+ return status;
+ }
+
+ return sprintf(buf, "%u\n", status);
+}
+
+static ssize_t store_cmd(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+ int status;
+ unsigned long lval;
+
+ if (kstrtoul(buf, 10, &lval))
+ return -EINVAL;
+
+ mutex_lock(&chip->lock);
+ if (lval > 0x10000)
+ lval = 0xFFFF;
+ status = cm3218_write(client, CM3218_REG_ADDR_CMD, (u16)lval);
+ if (status < 0) {
+ mutex_unlock(&chip->lock);
+ dev_err(dev, "Error in setting CM3218_REG_ADDR_CMD\n");
+ return status;
+ }
+ mutex_unlock(&chip->lock);
+
+ return count;
+}
+
+/* status */
+static ssize_t show_status(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+ int status;
+
+ status = cm3218_read(client, CM3218_REG_ADDR_STATUS);
+ if (status < 0) {
+ dev_err(dev, "Error in getting CM3218_REG_ADDR_STATUS\n");
+ return status;
+ }
+
+ return sprintf(buf, "%u\n", status);
+}
+
+#endif /* CM3218_DEBUG */
+
+/* Channel IO */
+static int cm3218_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ mutex_lock(&chip->lock);
+ if (mask == IIO_CHAN_INFO_CALIBSCALE && chan->type == IIO_LIGHT) {
+ chip->lensfactor = val;
+ ret = 0;
+ }
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+static int cm3218_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ int ret = -EINVAL;
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+
+ mutex_lock(&chip->lock);
+ if (chip->suspended) {
+ mutex_unlock(&chip->lock);
+ return -EBUSY;
+ }
+ switch (mask) {
+ case 0:
+ ret = cm3218_read_lux(client, val);
+ if (!ret)
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_CALIBSCALE:
+ *val = chip->lensfactor;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ break;
+ }
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+#define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1)
+#define IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT \
+ IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_CALIBSCALE)
+
+static const struct iio_chan_spec cm3218_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask = IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT,
+ }
+};
+
+static IIO_DEVICE_ATTR(illuminance0_input, S_IRUGO, show_lux, NULL, 0);
+static IIO_DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR,
+ show_lensfactor, store_lensfactor, 0);
+#ifdef CM3218_DEBUG
+static IIO_DEVICE_ATTR(cmd, S_IRUGO | S_IWUSR, show_cmd, store_cmd, 0);
+static IIO_DEVICE_ATTR(status, S_IRUGO, show_status, NULL, 0);
+#endif /* CM3218_DEBUG */
+
+#define CM3218_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr)
+#define CM3218_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
+static struct attribute *cm3218_attributes[] = {
+ CM3218_DEV_ATTR(illuminance0_input),
+ CM3218_DEV_ATTR(illuminance0_calibscale),
+#ifdef CM3218_DEBUG
+ CM3218_DEV_ATTR(cmd),
+ CM3218_DEV_ATTR(status),
+#endif /* CM3218_DEBUG */
+ NULL
+};
+
+static const struct attribute_group cm3218_group = {
+ .attrs = cm3218_attributes,
+};
+
+static int cm3218_chip_init(struct i2c_client *client)
+{
+ struct cm3218_chip *chip = iio_priv(i2c_get_clientdata(client));
+ int status, i;
+
+ memset(chip->reg_cache, 0, sizeof(chip->reg_cache));
+
+ for (i = 0; i < 5; i++) {
+ status = cm3218_write(client, CM3218_REG_ADDR_CMD,
+ CM3218_CMD_ALS_SD);
+ if (status >= 0)
+ break;
+ cm3218_read_ara(client);
+ }
+
+ status = cm3218_write(client, CM3218_REG_ADDR_CMD, CM3218_DEFAULT_CMD);
+ if (status < 0) {
+ dev_err(&client->dev, "Init CM3218 CMD fails\n");
+ return status;
+ }
+
+
+ /* Clean interrupt status */
+ cm3218_read(client, CM3218_REG_ADDR_STATUS);
+
+ return 0;
+}
+
+static const struct iio_info cm3218_info = {
+ .attrs = &cm3218_group,
+ .driver_module = THIS_MODULE,
+ .read_raw = &cm3218_read_raw,
+ .write_raw = &cm3218_write_raw,
+};
+
+static int cm3218_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct cm3218_chip *chip;
+ struct iio_dev *indio_dev;
+ int err;
+
+ indio_dev = IIO_DEVICE_ALLOC(sizeof(*chip));
+ if (indio_dev == NULL) {
+ dev_err(&client->dev, "iio allocation fails\n");
+ err = -ENOMEM;
+ goto exit;
+ }
+ chip = iio_priv(indio_dev);
+ chip->client = client;
+ i2c_set_clientdata(client, indio_dev);
+
+ mutex_init(&chip->lock);
+
+ chip->lensfactor = 1000;
+ chip->suspended = false;
+
+ err = cm3218_chip_init(client);
+ if (err)
+ goto exit_iio_free;
+
+ indio_dev->info = &cm3218_info;
+ indio_dev->channels = cm3218_channels;
+ indio_dev->num_channels = ARRAY_SIZE(cm3218_channels);
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ err = iio_device_register(indio_dev);
+ if (err) {
+ dev_err(&client->dev, "iio registration fails\n");
+ goto exit_iio_free;
+ }
+
+ return 0;
+exit_iio_free:
+ IIO_DEVICE_FREE(indio_dev);
+exit:
+ return err;
+}
+
+static int cm3218_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ const char *name = NULL;
+ int id;
+
+ cm3218_read_ara(client);
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ id = cm3218_read(client, CM3218_REG_ADDR_ID);
+ if (id < 0)
+ return -ENODEV;
+
+ switch (id&0xFF) {
+ case 0x18:
+ name = "cm3218";
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ strlcpy(info->type, name, I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int cm3218_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ dev_dbg(&client->dev, "%s()\n", __func__);
+ iio_device_unregister(indio_dev);
+ IIO_DEVICE_FREE(indio_dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cm3218_suspend(struct device *dev)
+{
+ struct cm3218_chip *chip = iio_priv(dev_get_drvdata(dev));
+
+ mutex_lock(&chip->lock);
+
+ /* Since this driver uses only polling commands, we are by default in
+ * auto shutdown (ie, power-down) mode.
+ * So we do not have much to do here.
+ */
+ chip->suspended = true;
+
+ mutex_unlock(&chip->lock);
+ return 0;
+}
+
+static int cm3218_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct cm3218_chip *chip = iio_priv(indio_dev);
+ struct i2c_client *client = chip->client;
+ int err;
+
+ mutex_lock(&chip->lock);
+
+ err = cm3218_chip_init(client);
+ if (!err)
+ chip->suspended = false;
+
+ mutex_unlock(&chip->lock);
+ return err;
+}
+
+static SIMPLE_DEV_PM_OPS(cm3218_pm_ops, cm3218_suspend, cm3218_resume);
+#define CM3218_PM_OPS (&cm3218_pm_ops)
+#else
+#define CM3218_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id cm3218_id[] = {
+ {"cm3218", 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, cm3218_id);
+
+static const struct of_device_id cm3218_of_match[] = {
+ { .compatible = "invn,cm3218", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, cm3218_of_match);
+
+static struct i2c_driver cm3218_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "cm3218",
+ .pm = CM3218_PM_OPS,
+ .owner = THIS_MODULE,
+ .of_match_table = cm3218_of_match,
+ },
+ .probe = cm3218_probe,
+ .remove = cm3218_remove,
+ .id_table = cm3218_id,
+ .detect = cm3218_detect,
+ .address_list = normal_i2c,
+};
+module_i2c_driver(cm3218_driver);
+
+MODULE_DESCRIPTION("CM3218 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
--
1.8.3.1
--
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