--- /dev/null
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * 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/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/isl29023.h>
+#include <linux/fsl_devices.h>
+
+#define ISL29023_DRV_NAME "isl29023"
+#define DRIVER_VERSION "1.0"
+
+#define ISL29023_COMMAND1 0x00
+#define ISL29023_MODE_SHIFT (5)
+#define ISL29023_MODE_MASK (0x7 << ISL29023_MODE_SHIFT)
+#define ISL29023_INT_FLAG_SHIFT (2)
+#define ISL29023_INT_FLAG_MASK (0x1 << ISL29023_INT_FLAG_SHIFT)
+#define ISL29023_INT_PERSISTS_SHIFT (0)
+#define ISL29023_INT_PERSISTS_MASK (0x3 << ISL29023_INT_PERSISTS_SHIFT)
+
+#define ISL29023_COMMAND2 0x01
+#define ISL29023_RES_SHIFT (2)
+#define ISL29023_RES_MASK (0x3 << ISL29023_RES_SHIFT)
+#define ISL29023_RANGE_SHIFT (0)
+#define ISL29023_RANGE_MASK (0x3 << ISL29023_RANGE_SHIFT)
+
+#define ISL29023_REG_LSB_SENSOR 0x02
+#define ISL29023_REG_MSB_SENSOR 0x03
+#define ISL29023_REG_IRQ_TH_LO_LSB 0x04
+#define ISL29023_REG_IRQ_TH_LO_MSB 0x05
+#define ISL29023_REG_IRQ_TH_HI_LSB 0x06
+#define ISL29023_REG_IRQ_TH_HI_MSB 0x07
+
+#define ISL29023_NUM_CACHABLE_REGS 8
+#define DEF_RANGE 2
+
+struct isl29023_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ struct input_dev *input;
+ struct work_struct work;
+ struct workqueue_struct *workqueue;
+ char phys[32];
+ u8 reg_cache[ISL29023_NUM_CACHABLE_REGS];
+ u8 mode_before_suspend;
+ u8 mode_before_interrupt;
+ u16 rext;
+};
+
+static int gain_range[] = {
+ 1000, 4000, 16000, 64000
+};
+
+/*
+ * register access helpers
+ */
+static int __isl29023_read_reg(struct i2c_client *client,
+ u32 reg, u8 mask, u8 shift)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ return (data->reg_cache[reg] & mask) >> shift;
+}
+
+static int __isl29023_write_reg(struct i2c_client *client,
+ u32 reg, u8 mask, u8 shift, u8 val)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int ret = 0;
+ u8 tmp;
+
+ if (reg >= ISL29023_NUM_CACHABLE_REGS)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+
+ tmp = data->reg_cache[reg];
+ tmp &= ~mask;
+ tmp |= val << shift;
+
+ ret = i2c_smbus_write_byte_data(client, reg, tmp);
+ if (!ret)
+ data->reg_cache[reg] = tmp;
+
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+/*
+ * internally used functions
+ */
+
+/* interrupt persists */
+static int isl29023_get_int_persists(struct i2c_client *client)
+{
+ return __isl29023_read_reg(client, ISL29023_COMMAND1,
+ ISL29023_INT_PERSISTS_MASK, ISL29023_INT_PERSISTS_SHIFT);
+}
+
+static int isl29023_set_int_persists(struct i2c_client *client,
+ int int_persists)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND1,
+ ISL29023_INT_PERSISTS_MASK, ISL29023_INT_PERSISTS_SHIFT,
+ int_persists);
+}
+
+/* interrupt flag */
+static int isl29023_get_int_flag(struct i2c_client *client)
+{
+ return __isl29023_read_reg(client, ISL29023_COMMAND1,
+ ISL29023_INT_FLAG_MASK, ISL29023_INT_FLAG_SHIFT);
+}
+
+static int isl29023_set_int_flag(struct i2c_client *client, int flag)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND1,
+ ISL29023_INT_FLAG_MASK, ISL29023_INT_FLAG_SHIFT, flag);
+}
+
+/* interrupt lt */
+static int isl29023_get_int_lt(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int lsb, msb, lt;
+
+ mutex_lock(&data->lock);
+ lsb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_LO_LSB);
+
+ if (lsb < 0) {
+ mutex_unlock(&data->lock);
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_LO_MSB);
+ mutex_unlock(&data->lock);
+
+ if (msb < 0)
+ return msb;
+
+ lt = ((msb << 8) | lsb);
+
+ return lt;
+}
+
+static int isl29023_set_int_lt(struct i2c_client *client, int lt)
+{
+ int ret = 0;
+ struct isl29023_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_LO_LSB,
+ lt & 0xff);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_LO_MSB,
+ (lt >> 8) & 0xff);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ data->reg_cache[ISL29023_REG_IRQ_TH_LO_MSB] = (lt >> 8) & 0xff;
+ data->reg_cache[ISL29023_REG_IRQ_TH_LO_LSB] = lt & 0xff;
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+/* interrupt ht */
+static int isl29023_get_int_ht(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int lsb, msb, ht;
+
+ mutex_lock(&data->lock);
+ lsb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_HI_LSB);
+
+ if (lsb < 0) {
+ mutex_unlock(&data->lock);
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_HI_MSB);
+ mutex_unlock(&data->lock);
+
+ if (msb < 0)
+ return msb;
+
+ ht = ((msb << 8) | lsb);
+
+ return ht;
+}
+
+static int isl29023_set_int_ht(struct i2c_client *client, int ht)
+{
+ int ret = 0;
+ struct isl29023_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_HI_LSB,
+ ht & 0xff);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_HI_MSB,
+ (ht >> 8) & 0xff);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ data->reg_cache[ISL29023_REG_IRQ_TH_HI_MSB] = (ht >> 8) & 0xff;
+ data->reg_cache[ISL29023_REG_IRQ_TH_HI_LSB] = ht & 0xff;
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+/* range */
+static int isl29023_get_range(struct i2c_client *client)
+{
+ return __isl29023_read_reg(client, ISL29023_COMMAND2,
+ ISL29023_RANGE_MASK, ISL29023_RANGE_SHIFT);
+}
+
+static int isl29023_set_range(struct i2c_client *client, int range)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND2,
+ ISL29023_RANGE_MASK, ISL29023_RANGE_SHIFT, range);
+}
+
+/* resolution */
+static int isl29023_get_resolution(struct i2c_client *client)
+{
+ return __isl29023_read_reg(client, ISL29023_COMMAND2,
+ ISL29023_RES_MASK, ISL29023_RES_SHIFT);
+}
+
+static int isl29023_set_resolution(struct i2c_client *client, int res)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND2,
+ ISL29023_RES_MASK, ISL29023_RES_SHIFT, res);
+}
+
+/* mode */
+static int isl29023_get_mode(struct i2c_client *client)
+{
+ return __isl29023_read_reg(client, ISL29023_COMMAND1,
+ ISL29023_MODE_MASK, ISL29023_MODE_SHIFT);
+}
+
+static int isl29023_set_mode(struct i2c_client *client, int mode)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND1,
+ ISL29023_MODE_MASK, ISL29023_MODE_SHIFT, mode);
+}
+
+/* power_state */
+static int isl29023_set_power_state(struct i2c_client *client, int state)
+{
+ return __isl29023_write_reg(client, ISL29023_COMMAND1,
+ ISL29023_MODE_MASK, ISL29023_MODE_SHIFT,
+ state ?
+ ISL29023_ALS_ONCE_MODE : ISL29023_PD_MODE);
+}
+
+static int isl29023_get_power_state(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ u8 cmdreg = data->reg_cache[ISL29023_COMMAND1];
+
+ if (cmdreg & ISL29023_MODE_MASK)
+ return 1;
+ else
+ return 0;
+}
+
+static int isl29023_get_adc_value(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int lsb, msb, range, bitdepth;
+
+ mutex_lock(&data->lock);
+ lsb = i2c_smbus_read_byte_data(client, ISL29023_REG_LSB_SENSOR);
+
+ if (lsb < 0) {
+ mutex_unlock(&data->lock);
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29023_REG_MSB_SENSOR);
+ mutex_unlock(&data->lock);
+
+ if (msb < 0)
+ return msb;
+
+ range = isl29023_get_range(client);
+ bitdepth = (4 - isl29023_get_resolution(client)) * 4;
+ return (((msb << 8) | lsb) * ((gain_range[range] * 499) / data->rext))
+ >> bitdepth;
+}
+
+static int isl29023_get_int_lt_value(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int lsb, msb, range, bitdepth;
+
+ mutex_lock(&data->lock);
+ lsb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_LO_LSB);
+
+ if (lsb < 0) {
+ mutex_unlock(&data->lock);
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_LO_MSB);
+ mutex_unlock(&data->lock);
+
+ if (msb < 0)
+ return msb;
+
+ range = isl29023_get_range(client);
+ bitdepth = (4 - isl29023_get_resolution(client)) * 4;
+ return (((msb << 8) | lsb) * ((gain_range[range] * 499) / data->rext))
+ >> bitdepth;
+}
+
+static int isl29023_get_int_ht_value(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int lsb, msb, range, bitdepth;
+
+ mutex_lock(&data->lock);
+ lsb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_HI_LSB);
+
+ if (lsb < 0) {
+ mutex_unlock(&data->lock);
+ return lsb;
+ }
+
+ msb = i2c_smbus_read_byte_data(client, ISL29023_REG_IRQ_TH_HI_MSB);
+ mutex_unlock(&data->lock);
+
+ if (msb < 0)
+ return msb;
+
+ range = isl29023_get_range(client);
+ bitdepth = (4 - isl29023_get_resolution(client)) * 4;
+ return (((msb << 8) | lsb) * ((gain_range[range] * 499) / data->rext))
+ >> bitdepth;
+}
+
+/*
+ * sysfs layer
+ */
+
+/* interrupt persists */
+static ssize_t isl29023_show_int_persists(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%i\n", isl29023_get_int_persists(client));
+}
+
+static ssize_t isl29023_store_int_persists(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) ||
+ (val > ISL29023_INT_PERSISTS_16))
+ return -EINVAL;
+
+ ret = isl29023_set_int_persists(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(int_persists, S_IWUSR | S_IRUGO,
+ isl29023_show_int_persists, isl29023_store_int_persists);
+
+/* interrupt flag */
+static ssize_t isl29023_show_int_flag(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%i\n", isl29023_get_int_flag(client));
+}
+
+static ssize_t isl29023_store_int_flag(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) || (val > 1))
+ return -EINVAL;
+
+ ret = isl29023_set_int_flag(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(int_flag, S_IWUSR | S_IRUGO,
+ isl29023_show_int_flag, isl29023_store_int_flag);
+
+/* interrupt lt */
+static ssize_t isl29023_show_int_lt(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%i\n", isl29023_get_int_lt(client));
+}
+
+static ssize_t isl29023_store_int_lt(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 16, &val) < 0) || (val > 0xffff))
+ return -EINVAL;
+
+ ret = isl29023_set_int_lt(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(int_lt, S_IWUSR | S_IRUGO,
+ isl29023_show_int_lt, isl29023_store_int_lt);
+
+/* interrupt ht */
+static ssize_t isl29023_show_int_ht(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%i\n", isl29023_get_int_ht(client));
+}
+
+static ssize_t isl29023_store_int_ht(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 16, &val) < 0) || (val > 0xffff))
+ return -EINVAL;
+
+ ret = isl29023_set_int_ht(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(int_ht, S_IWUSR | S_IRUGO,
+ isl29023_show_int_ht, isl29023_store_int_ht);
+
+/* range */
+static ssize_t isl29023_show_range(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%i\n", isl29023_get_range(client));
+}
+
+static ssize_t isl29023_store_range(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) || (val > ISL29023_RANGE_64K))
+ return -EINVAL;
+
+ ret = isl29023_set_range(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(range, S_IWUSR | S_IRUGO,
+ isl29023_show_range, isl29023_store_range);
+
+
+/* resolution */
+static ssize_t isl29023_show_resolution(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%d\n", isl29023_get_resolution(client));
+}
+
+static ssize_t isl29023_store_resolution(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) || (val > ISL29023_RES_4))
+ return -EINVAL;
+
+ ret = isl29023_set_resolution(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(resolution, S_IWUSR | S_IRUGO,
+ isl29023_show_resolution, isl29023_store_resolution);
+
+/* mode */
+static ssize_t isl29023_show_mode(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%d\n", isl29023_get_mode(client));
+}
+
+static ssize_t isl29023_store_mode(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) ||
+ (val > ISL29023_IR_CONT_MODE))
+ return -EINVAL;
+
+ ret = isl29023_set_mode(client, val);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
+ isl29023_show_mode, isl29023_store_mode);
+
+
+/* power state */
+static ssize_t isl29023_show_power_state(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%d\n", isl29023_get_power_state(client));
+}
+
+static ssize_t isl29023_store_power_state(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long val;
+ int ret;
+
+ if ((strict_strtoul(buf, 10, &val) < 0) || (val > 1))
+ return -EINVAL;
+
+ ret = isl29023_set_power_state(client, val);
+ return ret ? ret : count;
+}
+
+static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
+ isl29023_show_power_state, isl29023_store_power_state);
+
+/* lux */
+static ssize_t isl29023_show_lux(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ /* No LUX data if not operational */
+ if (!isl29023_get_power_state(client))
+ return -EBUSY;
+
+ return sprintf(buf, "%d\n", isl29023_get_adc_value(client));
+}
+
+static DEVICE_ATTR(lux, S_IRUGO, isl29023_show_lux, NULL);
+
+/* lux interrupt low threshold */
+static ssize_t isl29023_show_int_lt_lux(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ /* No LUX data if not operational */
+ if (isl29023_get_mode(client) != ISL29023_ALS_ONCE_MODE &&
+ isl29023_get_mode(client) != ISL29023_ALS_CONT_MODE)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", isl29023_get_int_lt_value(client));
+}
+
+static ssize_t isl29023_store_int_lt_lux(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ unsigned long val, lux_data;
+ int range, bitdepth, ret;
+ u8 lsb, msb;
+
+ if ((strict_strtoul(buf, 10, &val) < 0))
+ return -EINVAL;
+
+ /* No LUX data if not operational */
+ if (isl29023_get_mode(client) != ISL29023_ALS_ONCE_MODE &&
+ isl29023_get_mode(client) != ISL29023_ALS_CONT_MODE)
+ return -EIO;
+
+ if (val > (gain_range[isl29023_get_range(client)]*499/data->rext))
+ return -EINVAL;
+
+ range = isl29023_get_range(client);
+ bitdepth = (4 - isl29023_get_resolution(client)) * 4;
+ lux_data = ((unsigned long)(val << bitdepth)) /
+ ((gain_range[range] * 499) / data->rext);
+ lux_data &= 0xffff;
+
+ msb = lux_data >> 8;
+ lsb = lux_data & 0xff;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_LO_LSB,
+ lsb);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_LO_MSB,
+ msb);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ data->reg_cache[ISL29023_REG_IRQ_TH_LO_MSB] = msb;
+ data->reg_cache[ISL29023_REG_IRQ_TH_LO_LSB] = lsb;
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static DEVICE_ATTR(int_lt_lux, S_IWUSR | S_IRUGO,
+ isl29023_show_int_lt_lux, isl29023_store_int_lt_lux);
+
+/* lux interrupt high threshold */
+static ssize_t isl29023_show_int_ht_lux(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ /* No LUX data if not operational */
+ if (isl29023_get_mode(client) != ISL29023_ALS_ONCE_MODE &&
+ isl29023_get_mode(client) != ISL29023_ALS_CONT_MODE)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", isl29023_get_int_ht_value(client));
+}
+
+static ssize_t isl29023_store_int_ht_lux(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ unsigned long val, lux_data;
+ int range, bitdepth, ret;
+ u8 lsb, msb;
+
+ if ((strict_strtoul(buf, 10, &val) < 0))
+ return -EINVAL;
+
+ /* No LUX data if not operational */
+ if (isl29023_get_mode(client) != ISL29023_ALS_ONCE_MODE &&
+ isl29023_get_mode(client) != ISL29023_ALS_CONT_MODE)
+ return -EIO;
+
+ if (val > (gain_range[isl29023_get_range(client)]*499/data->rext))
+ return -EINVAL;
+
+ range = isl29023_get_range(client);
+ bitdepth = (4 - isl29023_get_resolution(client)) * 4;
+ lux_data = ((unsigned long)(val << bitdepth)) /
+ ((gain_range[range] * 499) / data->rext);
+ lux_data &= 0xffff;
+
+ msb = lux_data >> 8;
+ lsb = lux_data & 0xff;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_HI_LSB,
+ lsb);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ ret = i2c_smbus_write_byte_data(client, ISL29023_REG_IRQ_TH_HI_MSB,
+ msb);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+
+ data->reg_cache[ISL29023_REG_IRQ_TH_HI_MSB] = msb;
+ data->reg_cache[ISL29023_REG_IRQ_TH_HI_LSB] = lsb;
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static DEVICE_ATTR(int_ht_lux, S_IWUSR | S_IRUGO,
+ isl29023_show_int_ht_lux, isl29023_store_int_ht_lux);
+
+static struct attribute *isl29023_attributes[] = {
+ &dev_attr_int_persists.attr,
+ &dev_attr_range.attr,
+ &dev_attr_resolution.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_power_state.attr,
+ &dev_attr_lux.attr,
+ &dev_attr_int_lt_lux.attr,
+ &dev_attr_int_ht_lux.attr,
+ &dev_attr_int_lt.attr,
+ &dev_attr_int_ht.attr,
+ &dev_attr_int_flag.attr,
+ NULL
+};
+
+static const struct attribute_group isl29023_attr_group = {
+ .attrs = isl29023_attributes,
+};
+
+static int isl29023_init_client(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+ int i;
+
+ /* read all the registers once to fill the cache.
+ * if one of the reads fails, we consider the init failed */
+ for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++) {
+ int v = i2c_smbus_read_byte_data(client, i);
+ if (v < 0)
+ return -ENODEV;
+
+ data->reg_cache[i] = v;
+ }
+
+ /* set defaults */
+ isl29023_set_int_persists(client, ISL29023_INT_PERSISTS_8);
+ isl29023_set_int_ht(client, 0xffff);
+ isl29023_set_int_lt(client, 0x0);
+ isl29023_set_range(client, ISL29023_RANGE_16K);
+ isl29023_set_resolution(client, ISL29023_RES_16);
+ isl29023_set_mode(client, ISL29023_ALS_ONCE_MODE);
+ isl29023_set_int_flag(client, 0);
+ isl29023_set_power_state(client, 0);
+
+ return 0;
+}
+
+static void isl29023_work(struct work_struct *work)
+{
+ struct isl29023_data *data =
+ container_of(work, struct isl29023_data, work);
+ struct i2c_client *client = data->client;
+ int lux;
+
+ /* Clear interrupt flag */
+ isl29023_set_int_flag(client, 0);
+
+ /*
+ * Max threshold to avoid multiple interrupts.
+ * Let the user to reprogramme the interrupt
+ * thresholds.
+ */
+ isl29023_set_int_ht(client, 0xffff);
+ isl29023_set_int_lt(client, 0x0);
+
+ data->mode_before_interrupt = isl29023_get_mode(client);
+ lux = isl29023_get_adc_value(client);
+
+ /* To clear the interrpt status */
+ isl29023_set_power_state(client, ISL29023_PD_MODE);
+ isl29023_set_mode(client, data->mode_before_interrupt);
+
+ msleep(100);
+
+ input_report_abs(data->input, ABS_MISC, lux);
+ input_sync(data->input);
+}
+
+static irqreturn_t isl29023_irq_handler(int irq, void *handle)
+{
+ struct isl29023_data *data = handle;
+ queue_work(data->workqueue, &data->work);
+ return IRQ_HANDLED;
+}
+
+/*
+ * I2C layer
+ */
+
+static int __devinit isl29023_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct isl29023_data *data;
+ struct fsl_mxc_lightsensor_platform_data *ls_data;
+ struct input_dev *input_dev;
+ int err = 0;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ return -EIO;
+
+ data = kzalloc(sizeof(struct isl29023_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ls_data = (struct mxc_lightsensor_platform_data *)
+ (client->dev).platform_data;
+
+ data->client = client;
+ data->rext = ls_data->rext;
+ snprintf(data->phys, sizeof(data->phys),
+ "%s", dev_name(&client->dev));
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->lock);
+
+ /* initialize the ISL29023 chip */
+ err = isl29023_init_client(client);
+ if (err)
+ goto exit_kfree;
+
+ /* register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &isl29023_attr_group);
+ if (err)
+ goto exit_kfree;
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ err = -ENOMEM;
+ goto exit_kfree;
+ }
+
+ data->input = input_dev;
+ input_dev->name = "isl29023 light sensor";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->phys = data->phys;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ input_set_abs_params(input_dev, ABS_MISC, 0,
+ gain_range[DEF_RANGE]*499/data->rext, 0, 0);
+
+ err = input_register_device(input_dev);
+ if (err)
+ goto exit_free_input;
+
+ /* set irq type to edge falling */
+ set_irq_type(client->irq, IRQF_TRIGGER_FALLING);
+ err = request_irq(client->irq, isl29023_irq_handler, 0,
+ client->dev.driver->name, data);
+ if (err < 0) {
+ dev_err(&client->dev, "failed to register irq %d!\n",
+ client->irq);
+ goto exit_free_input;
+ }
+
+ data->workqueue = create_singlethread_workqueue("isl29023");
+ INIT_WORK(&data->work, isl29023_work);
+ if (data->workqueue == NULL) {
+ dev_err(&client->dev, "couldn't create workqueue\n");
+ err = -ENOMEM;
+ goto exit_free_interrupt;
+ }
+
+ dev_info(&client->dev, "driver version %s enabled\n", DRIVER_VERSION);
+ return 0;
+
+exit_free_interrupt:
+ free_irq(client->irq, data);
+exit_free_input:
+ input_free_device(input_dev);
+exit_kfree:
+ kfree(data);
+ return err;
+}
+
+static int __devexit isl29023_remove(struct i2c_client *client)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+
+ cancel_work_sync(&data->work);
+ destroy_workqueue(data->workqueue);
+ free_irq(client->irq, data);
+ input_unregister_device(data->input);
+ input_free_device(data->input);
+ sysfs_remove_group(&client->dev.kobj, &isl29023_attr_group);
+ isl29023_set_power_state(client, 0);
+ kfree(i2c_get_clientdata(client));
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int isl29023_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct isl29023_data *data = i2c_get_clientdata(client);
+
+ data->mode_before_suspend = isl29023_get_mode(client);
+ return isl29023_set_power_state(client, ISL29023_PD_MODE);
+}
+
+static int isl29023_resume(struct i2c_client *client)
+{
+ int i;
+ struct isl29023_data *data = i2c_get_clientdata(client);
+
+ /* restore registers from cache */
+ for (i = 0; i < ARRAY_SIZE(data->reg_cache); i++)
+ if (i2c_smbus_write_byte_data(client, i, data->reg_cache[i]))
+ return -EIO;
+
+ return isl29023_set_mode(client, data->mode_before_suspend);
+}
+
+#else
+#define isl29023_suspend NULL
+#define isl29023_resume NULL
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id isl29023_id[] = {
+ { ISL29023_DRV_NAME, 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, isl29023_id);
+
+static struct i2c_driver isl29023_driver = {
+ .driver = {
+ .name = ISL29023_DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+ .suspend = isl29023_suspend,
+ .resume = isl29023_resume,
+ .probe = isl29023_probe,
+ .remove = __devexit_p(isl29023_remove),
+ .id_table = isl29023_id,
+};
+
+static int __init isl29023_init(void)
+{
+ return i2c_add_driver(&isl29023_driver);
+}
+
+static void __exit isl29023_exit(void)
+{
+ i2c_del_driver(&isl29023_driver);
+}
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("ISL29023 ambient light sensor driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
+
+module_init(isl29023_init);
+module_exit(isl29023_exit);
projects / karo-tx-linux.git / commitdiff