Merge branch 'master' into for-next

35 files changed, 521 insertions, 5 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index d16af6a423fb..2191c8d896a0 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -268,6 +268,16 @@ config ISL29003
 	  This driver can also be built as a module.  If so, the module
 	  will be called isl29003.
 
+config SENSORS_TSL2550
+	tristate "Taos TSL2550 ambient light sensor"
+	depends on I2C && SYSFS
+	help
+	  If you say yes here you get support for the Taos TSL2550
+	  ambient light sensor.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called tsl2550.
+
 config EP93XX_PWM
 	tristate "EP93xx PWM support"
 	depends on ARCH_EP93XX
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 049ff2482f30..27c484355414 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_SGI_GRU)		+= sgi-gru/
 obj-$(CONFIG_CS5535_MFGPT)	+= cs5535-mfgpt.o
 obj-$(CONFIG_HP_ILO)		+= hpilo.o
 obj-$(CONFIG_ISL29003)		+= isl29003.o
+obj-$(CONFIG_SENSORS_TSL2550)	+= tsl2550.o
 obj-$(CONFIG_EP93XX_PWM)	+= ep93xx_pwm.o
 obj-$(CONFIG_DS1682)		+= ds1682.o
 obj-$(CONFIG_TI_DAC7512)	+= ti_dac7512.o
diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index 558bf3f2c276..4afffe610f99 100644
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/spinlock.h>
 #include <linux/atmel-ssc.h>
+#include <linux/slab.h>
 
 /* Serialize access to ssc_list and user count */
 static DEFINE_SPINLOCK(user_lock);
diff --git a/drivers/misc/atmel_pwm.c b/drivers/misc/atmel_pwm.c
index 6aa5294dfec4..0f3fb4f03bdf 100644
--- a/drivers/misc/atmel_pwm.c
+++ b/drivers/misc/atmel_pwm.c
@@ -1,6 +1,7 @@
 #include <linux/module.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index 05dc8a31f280..3891124001f2 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -6,6 +6,7 @@
 #include <linux/ioport.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 
 /* Number of bytes to reserve for the iomem resource */
 #define ATMEL_TC_IOMEM_SIZE	256
diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
index b5346b4db91a..ed090e77c9cd 100644
--- a/drivers/misc/c2port/core.c
+++ b/drivers/misc/c2port/core.c
@@ -20,6 +20,7 @@
 #include <linux/delay.h>
 #include <linux/idr.h>
 #include <linux/sched.h>
+#include <linux/slab.h>
 
 #include <linux/c2port.h>
 
@@ -912,8 +913,8 @@ struct c2port_device *c2port_device_register(char *name,
 
 	c2dev->dev = device_create(c2port_class, NULL, 0, c2dev,
 					"c2port%d", id);
-	if (unlikely(!c2dev->dev)) {
-		ret = -ENOMEM;
+	if (unlikely(IS_ERR(c2dev->dev))) {
+		ret = PTR_ERR(c2dev->dev);
 		goto error_device_create;
 	}
 	dev_set_drvdata(c2dev->dev, c2dev);
diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
index b14eab0f2ba5..efec4139c3f6 100644
--- a/drivers/misc/cb710/core.c
+++ b/drivers/misc/cb710/core.c
@@ -9,11 +9,11 @@
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/spinlock.h>
 #include <linux/idr.h>
 #include <linux/cb710.h>
+#include <linux/gfp.h>
 
 static DEFINE_IDA(cb710_ida);
 static DEFINE_SPINLOCK(cb710_ida_lock);
diff --git a/drivers/misc/cb710/debug.c b/drivers/misc/cb710/debug.c
index 02358d086e03..fcb3b8e30c52 100644
--- a/drivers/misc/cb710/debug.c
+++ b/drivers/misc/cb710/debug.c
@@ -10,7 +10,6 @@
 #include <linux/cb710.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/slab.h>
 
 #define CB710_REG_COUNT		0x80
 
diff --git a/drivers/misc/cs5535-mfgpt.c b/drivers/misc/cs5535-mfgpt.c
index 8110460558ff..9bec24db4d41 100644
--- a/drivers/misc/cs5535-mfgpt.c
+++ b/drivers/misc/cs5535-mfgpt.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/cs5535.h>
+#include <linux/slab.h>
 
 #define DRV_NAME "cs5535-mfgpt"
 #define MFGPT_BAR 2
diff --git a/drivers/misc/ds1682.c b/drivers/misc/ds1682.c
index f3ee4a1abb77..9197cfc55015 100644
--- a/drivers/misc/ds1682.c
+++ b/drivers/misc/ds1682.c
@@ -33,7 +33,6 @@
 
 #include <linux/module.h>
 #include <linux/init.h>
-#include <linux/slab.h>
 #include <linux/i2c.h>
 #include <linux/string.h>
 #include <linux/list.h>
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 2cb2736d65aa..db7d0f21b65d 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -505,6 +505,7 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	 * Export the EEPROM bytes through sysfs, since that's convenient.
 	 * By default, only root should see the data (maybe passwords etc)
 	 */
+	sysfs_bin_attr_init(&at24->bin);
 	at24->bin.attr.name = "eeprom";
 	at24->bin.attr.mode = chip.flags & AT24_FLAG_IRUGO ? S_IRUGO : S_IRUSR;
 	at24->bin.read = at24_bin_read;
diff --git a/drivers/misc/eeprom/at25.c b/drivers/misc/eeprom/at25.c
index d902d81dde39..d194212a41f6 100644
--- a/drivers/misc/eeprom/at25.c
+++ b/drivers/misc/eeprom/at25.c
@@ -347,6 +347,7 @@ static int at25_probe(struct spi_device *spi)
 	 * that's sensitive for read and/or write, like ethernet addresses,
 	 * security codes, board-specific manufacturing calibrations, etc.
 	 */
+	sysfs_bin_attr_init(&at25->bin);
 	at25->bin.attr.name = "eeprom";
 	at25->bin.attr.mode = S_IRUSR;
 	at25->bin.read = at25_bin_read;
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 1eac626e710a..48c84a58163e 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -27,6 +27,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
 
 static LIST_HEAD(container_list);
 static DEFINE_MUTEX(container_list_lock);
diff --git a/drivers/misc/ep93xx_pwm.c b/drivers/misc/ep93xx_pwm.c
index ba4694169d79..46b3439673e9 100644
--- a/drivers/misc/ep93xx_pwm.c
+++ b/drivers/misc/ep93xx_pwm.c
@@ -19,6 +19,7 @@
 
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index a92a3a742b43..98ad0120aa9b 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -25,6 +25,7 @@
 #include <linux/io.h>
 #include <linux/wait.h>
 #include <linux/poll.h>
+#include <linux/slab.h>
 #include "hpilo.h"
 
 static struct class *ilo_class;
diff --git a/drivers/misc/ibmasm/command.c b/drivers/misc/ibmasm/command.c
index e2031739aa29..5c766b4fb238 100644
--- a/drivers/misc/ibmasm/command.c
+++ b/drivers/misc/ibmasm/command.c
@@ -23,6 +23,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include "ibmasm.h"
 #include "lowlevel.h"
 
diff --git a/drivers/misc/ibmasm/event.c b/drivers/misc/ibmasm/event.c
index 572d41ffc186..76bfda1ffaa9 100644
--- a/drivers/misc/ibmasm/event.c
+++ b/drivers/misc/ibmasm/event.c
@@ -23,6 +23,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/slab.h>
 #include "ibmasm.h"
 #include "lowlevel.h"
 
diff --git a/drivers/misc/ibmasm/ibmasmfs.c b/drivers/misc/ibmasm/ibmasmfs.c
index aecf40ecb3a4..8844a3f45381 100644
--- a/drivers/misc/ibmasm/ibmasmfs.c
+++ b/drivers/misc/ibmasm/ibmasmfs.c
@@ -75,6 +75,7 @@
 
 #include <linux/fs.h>
 #include <linux/pagemap.h>
+#include <linux/slab.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include "ibmasm.h"
diff --git a/drivers/misc/ibmasm/module.c b/drivers/misc/ibmasm/module.c
index dc14b0b9cbfa..a234d965243b 100644
--- a/drivers/misc/ibmasm/module.c
+++ b/drivers/misc/ibmasm/module.c
@@ -52,6 +52,7 @@
 
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/slab.h>
 #include "ibmasm.h"
 #include "lowlevel.h"
 #include "remote.h"
diff --git a/drivers/misc/ics932s401.c b/drivers/misc/ics932s401.c
index 395a4ea64e9c..152e9d93eecb 100644
--- a/drivers/misc/ics932s401.c
+++ b/drivers/misc/ics932s401.c
@@ -26,6 +26,7 @@
 #include <linux/mutex.h>
 #include <linux/delay.h>
 #include <linux/log2.h>
+#include <linux/slab.h>
 
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = { 0x69, I2C_CLIENT_END };
diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c
index 09dcb699e667..193206602d88 100644
--- a/drivers/misc/ioc4.c
+++ b/drivers/misc/ioc4.c
@@ -30,6 +30,7 @@
 #include <linux/pci.h>
 #include <linux/ioc4.h>
 #include <linux/ktime.h>
+#include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/time.h>
 #include <asm/io.h>
diff --git a/drivers/misc/iwmc3200top/debugfs.c b/drivers/misc/iwmc3200top/debugfs.c
index 0c8ea0a1c8a3..e9eda471f6e0 100644
--- a/drivers/misc/iwmc3200top/debugfs.c
+++ b/drivers/misc/iwmc3200top/debugfs.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/mmc/sdio_func.h>
diff --git a/drivers/misc/iwmc3200top/fw-download.c b/drivers/misc/iwmc3200top/fw-download.c
index 9dbaeb574e63..e27afde6e99f 100644
--- a/drivers/misc/iwmc3200top/fw-download.c
+++ b/drivers/misc/iwmc3200top/fw-download.c
@@ -26,6 +26,7 @@
 
 #include <linux/firmware.h>
 #include <linux/mmc/sdio_func.h>
+#include <linux/slab.h>
 #include <asm/unaligned.h>
 
 #include "iwmc3200top.h"
diff --git a/drivers/misc/iwmc3200top/log.c b/drivers/misc/iwmc3200top/log.c
index d569279698f6..a36a55a49cac 100644
--- a/drivers/misc/iwmc3200top/log.c
+++ b/drivers/misc/iwmc3200top/log.c
@@ -26,6 +26,7 @@
 
 #include <linux/kernel.h>
 #include <linux/mmc/sdio_func.h>
+#include <linux/slab.h>
 #include <linux/ctype.h>
 #include "fw-msg.h"
 #include "iwmc3200top.h"
diff --git a/drivers/misc/iwmc3200top/main.c b/drivers/misc/iwmc3200top/main.c
index 3b7292a5cea9..c73cef2c3c5e 100644
--- a/drivers/misc/iwmc3200top/main.c
+++ b/drivers/misc/iwmc3200top/main.c
@@ -25,6 +25,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index fcb6ec1af173..72450237a0f4 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -295,6 +295,10 @@ static int check_and_rewind_pc(char *put_str, char *arg)
 	/* On x86 a breakpoint stop requires it to be decremented */
 	if (addr + 1 == kgdbts_regs.ip)
 		offset = -1;
+#elif defined(CONFIG_SUPERH)
+	/* On SUPERH a breakpoint stop requires it to be decremented */
+	if (addr + 2 == kgdbts_regs.pc)
+		offset = -2;
 #endif
 	if (strcmp(arg, "silent") &&
 		instruction_pointer(&kgdbts_regs) + offset != addr) {
@@ -305,6 +309,8 @@ static int check_and_rewind_pc(char *put_str, char *arg)
 #ifdef CONFIG_X86
 	/* On x86 adjust the instruction pointer if needed */
 	kgdbts_regs.ip += offset;
+#elif defined(CONFIG_SUPERH)
+	kgdbts_regs.pc += offset;
 #endif
 	return 0;
 }
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 4a0648301fdf..31a991161f0a 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -40,6 +40,7 @@
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/hrtimer.h>
+#include <linux/slab.h>
 #include <scsi/scsi_cmnd.h>
 #include <linux/debugfs.h>
 
diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
index 779aa8ebe4cf..75ee0d3f6f45 100644
--- a/drivers/misc/phantom.c
+++ b/drivers/misc/phantom.c
@@ -21,6 +21,7 @@
 #include <linux/poll.h>
 #include <linux/interrupt.h>
 #include <linux/cdev.h>
+#include <linux/slab.h>
 #include <linux/phantom.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>
diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
index 832ed4c88cf7..8d082b46426b 100644
--- a/drivers/misc/sgi-xp/xpc_main.c
+++ b/drivers/misc/sgi-xp/xpc_main.c
@@ -44,6 +44,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/device.h>
 #include <linux/delay.h>
diff --git a/drivers/misc/sgi-xp/xpc_partition.c b/drivers/misc/sgi-xp/xpc_partition.c
index 9a6268c89fdd..d551f09ccb79 100644
--- a/drivers/misc/sgi-xp/xpc_partition.c
+++ b/drivers/misc/sgi-xp/xpc_partition.c
@@ -17,6 +17,7 @@
 
 #include <linux/device.h>
 #include <linux/hardirq.h>
+#include <linux/slab.h>
 #include "xpc.h"
 #include <asm/uv/uv_hub.h>
 
diff --git a/drivers/misc/sgi-xp/xpc_sn2.c b/drivers/misc/sgi-xp/xpc_sn2.c
index 8b70e03f939f..7d71c04fc938 100644
--- a/drivers/misc/sgi-xp/xpc_sn2.c
+++ b/drivers/misc/sgi-xp/xpc_sn2.c
@@ -14,6 +14,7 @@
  */
 
 #include <linux/delay.h>
+#include <linux/slab.h>
 #include <asm/uncached.h>
 #include <asm/sn/mspec.h>
 #include <asm/sn/sn_sal.h>
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 8725d5e8ab0c..1f59ee2226ca 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -19,6 +19,7 @@
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/slab.h>
 #include <asm/uv/uv_hub.h>
 #if defined CONFIG_X86_64
 #include <asm/uv/bios.h>
diff --git a/drivers/misc/sgi-xp/xpnet.c b/drivers/misc/sgi-xp/xpnet.c
index 57b152f8d1b9..ee5109a3cd98 100644
--- a/drivers/misc/sgi-xp/xpnet.c
+++ b/drivers/misc/sgi-xp/xpnet.c
@@ -20,6 +20,7 @@
  *
  */
 
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
diff --git a/drivers/misc/tifm_core.c b/drivers/misc/tifm_core.c
index 98bcba521da2..5f6852dff40b 100644
--- a/drivers/misc/tifm_core.c
+++ b/drivers/misc/tifm_core.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/tifm.h>
+#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/idr.h>
 
diff --git a/drivers/misc/tsl2550.c b/drivers/misc/tsl2550.c
new file mode 100644
index 000000000000..483ae5f7f68e
--- /dev/null
+++ b/drivers/misc/tsl2550.c
@@ -0,0 +1,473 @@
+/*
+ *  tsl2550.c - Linux kernel modules for ambient light sensor
+ *
+ *  Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it>
+ *  Copyright (C) 2007 Eurotech S.p.A. <info@eurotech.it>
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+#define TSL2550_DRV_NAME	"tsl2550"
+#define DRIVER_VERSION		"1.2"
+
+/*
+ * Defines
+ */
+
+#define TSL2550_POWER_DOWN		0x00
+#define TSL2550_POWER_UP		0x03
+#define TSL2550_STANDARD_RANGE		0x18
+#define TSL2550_EXTENDED_RANGE		0x1d
+#define TSL2550_READ_ADC0		0x43
+#define TSL2550_READ_ADC1		0x83
+
+/*
+ * Structs
+ */
+
+struct tsl2550_data {
+	struct i2c_client *client;
+	struct mutex update_lock;
+
+	unsigned int power_state:1;
+	unsigned int operating_mode:1;
+};
+
+/*
+ * Global data
+ */
+
+static const u8 TSL2550_MODE_RANGE[2] = {
+	TSL2550_STANDARD_RANGE, TSL2550_EXTENDED_RANGE,
+};
+
+/*
+ * Management functions
+ */
+
+static int tsl2550_set_operating_mode(struct i2c_client *client, int mode)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+
+	int ret = i2c_smbus_write_byte(client, TSL2550_MODE_RANGE[mode]);
+
+	data->operating_mode = mode;
+
+	return ret;
+}
+
+static int tsl2550_set_power_state(struct i2c_client *client, int state)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	int ret;
+
+	if (state == 0)
+		ret = i2c_smbus_write_byte(client, TSL2550_POWER_DOWN);
+	else {
+		ret = i2c_smbus_write_byte(client, TSL2550_POWER_UP);
+
+		/* On power up we should reset operating mode also... */
+		tsl2550_set_operating_mode(client, data->operating_mode);
+	}
+
+	data->power_state = state;
+
+	return ret;
+}
+
+static int tsl2550_get_adc_value(struct i2c_client *client, u8 cmd)
+{
+	int ret;
+
+	ret = i2c_smbus_read_byte_data(client, cmd);
+	if (ret < 0)
+		return ret;
+	if (!(ret & 0x80))
+		return -EAGAIN;
+	return ret & 0x7f;	/* remove the "valid" bit */
+}
+
+/*
+ * LUX calculation
+ */
+
+#define	TSL2550_MAX_LUX		1846
+
+static const u8 ratio_lut[] = {
+	100, 100, 100, 100, 100, 100, 100, 100,
+	100, 100, 100, 100, 100, 100, 99, 99,
+	99, 99, 99, 99, 99, 99, 99, 99,
+	99, 99, 99, 98, 98, 98, 98, 98,
+	98, 98, 97, 97, 97, 97, 97, 96,
+	96, 96, 96, 95, 95, 95, 94, 94,
+	93, 93, 93, 92, 92, 91, 91, 90,
+	89, 89, 88, 87, 87, 86, 85, 84,
+	83, 82, 81, 80, 79, 78, 77, 75,
+	74, 73, 71, 69, 68, 66, 64, 62,
+	60, 58, 56, 54, 52, 49, 47, 44,
+	42, 41, 40, 40, 39, 39, 38, 38,
+	37, 37, 37, 36, 36, 36, 35, 35,
+	35, 35, 34, 34, 34, 34, 33, 33,
+	33, 33, 32, 32, 32, 32, 32, 31,
+	31, 31, 31, 31, 30, 30, 30, 30,
+	30,
+};
+
+static const u16 count_lut[] = {
+	0, 1, 2, 3, 4, 5, 6, 7,
+	8, 9, 10, 11, 12, 13, 14, 15,
+	16, 18, 20, 22, 24, 26, 28, 30,
+	32, 34, 36, 38, 40, 42, 44, 46,
+	49, 53, 57, 61, 65, 69, 73, 77,
+	81, 85, 89, 93, 97, 101, 105, 109,
+	115, 123, 131, 139, 147, 155, 163, 171,
+	179, 187, 195, 203, 211, 219, 227, 235,
+	247, 263, 279, 295, 311, 327, 343, 359,
+	375, 391, 407, 423, 439, 455, 471, 487,
+	511, 543, 575, 607, 639, 671, 703, 735,
+	767, 799, 831, 863, 895, 927, 959, 991,
+	1039, 1103, 1167, 1231, 1295, 1359, 1423, 1487,
+	1551, 1615, 1679, 1743, 1807, 1871, 1935, 1999,
+	2095, 2223, 2351, 2479, 2607, 2735, 2863, 2991,
+	3119, 3247, 3375, 3503, 3631, 3759, 3887, 4015,
+};
+
+/*
+ * This function is described into Taos TSL2550 Designer's Notebook
+ * pages 2, 3.
+ */
+static int tsl2550_calculate_lux(u8 ch0, u8 ch1)
+{
+	unsigned int lux;
+
+	/* Look up count from channel values */
+	u16 c0 = count_lut[ch0];
+	u16 c1 = count_lut[ch1];
+
+	/*
+	 * Calculate ratio.
+	 * Note: the "128" is a scaling factor
+	 */
+	u8 r = 128;
+
+	/* Avoid division by 0 and count 1 cannot be greater than count 0 */
+	if (c1 <= c0)
+		if (c0) {
+			r = c1 * 128 / c0;
+
+			/* Calculate LUX */
+			lux = ((c0 - c1) * ratio_lut[r]) / 256;
+		} else
+			lux = 0;
+	else
+		return -EAGAIN;
+
+	/* LUX range check */
+	return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux;
+}
+
+/*
+ * SysFS support
+ */
+
+static ssize_t tsl2550_show_power_state(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+	return sprintf(buf, "%u\n", data->power_state);
+}
+
+static ssize_t tsl2550_store_power_state(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	unsigned long val = simple_strtoul(buf, NULL, 10);
+	int ret;
+
+	if (val < 0 || val > 1)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	ret = tsl2550_set_power_state(client, val);
+	mutex_unlock(&data->update_lock);
+
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO,
+		   tsl2550_show_power_state, tsl2550_store_power_state);
+
+static ssize_t tsl2550_show_operating_mode(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+	return sprintf(buf, "%u\n", data->operating_mode);
+}
+
+static ssize_t tsl2550_store_operating_mode(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	unsigned long val = simple_strtoul(buf, NULL, 10);
+	int ret;
+
+	if (val < 0 || val > 1)
+		return -EINVAL;
+
+	if (data->power_state == 0)
+		return -EBUSY;
+
+	mutex_lock(&data->update_lock);
+	ret = tsl2550_set_operating_mode(client, val);
+	mutex_unlock(&data->update_lock);
+
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR(operating_mode, S_IWUSR | S_IRUGO,
+		   tsl2550_show_operating_mode, tsl2550_store_operating_mode);
+
+static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	u8 ch0, ch1;
+	int ret;
+
+	ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC0);
+	if (ret < 0)
+		return ret;
+	ch0 = ret;
+
+	ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC1);
+	if (ret < 0)
+		return ret;
+	ch1 = ret;
+
+	/* Do the job */
+	ret = tsl2550_calculate_lux(ch0, ch1);
+	if (ret < 0)
+		return ret;
+	if (data->operating_mode == 1)
+		ret *= 5;
+
+	return sprintf(buf, "%d\n", ret);
+}
+
+static ssize_t tsl2550_show_lux1_input(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	int ret;
+
+	/* No LUX data if not operational */
+	if (!data->power_state)
+		return -EBUSY;
+
+	mutex_lock(&data->update_lock);
+	ret = __tsl2550_show_lux(client, buf);
+	mutex_unlock(&data->update_lock);
+
+	return ret;
+}
+
+static DEVICE_ATTR(lux1_input, S_IRUGO,
+		   tsl2550_show_lux1_input, NULL);
+
+static struct attribute *tsl2550_attributes[] = {
+	&dev_attr_power_state.attr,
+	&dev_attr_operating_mode.attr,
+	&dev_attr_lux1_input.attr,
+	NULL
+};
+
+static const struct attribute_group tsl2550_attr_group = {
+	.attrs = tsl2550_attributes,
+};
+
+/*
+ * Initialization function
+ */
+
+static int tsl2550_init_client(struct i2c_client *client)
+{
+	struct tsl2550_data *data = i2c_get_clientdata(client);
+	int err;
+
+	/*
+	 * Probe the chip. To do so we try to power up the device and then to
+	 * read back the 0x03 code
+	 */
+	err = i2c_smbus_read_byte_data(client, TSL2550_POWER_UP);
+	if (err < 0)
+		return err;
+	if (err != TSL2550_POWER_UP)
+		return -ENODEV;
+	data->power_state = 1;
+
+	/* Set the default operating mode */
+	err = i2c_smbus_write_byte(client,
+				   TSL2550_MODE_RANGE[data->operating_mode]);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+/*
+ * I2C init/probing/exit functions
+ */
+
+static struct i2c_driver tsl2550_driver;
+static int __devinit tsl2550_probe(struct i2c_client *client,
+				   const struct i2c_device_id *id)
+{
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	struct tsl2550_data *data;
+	int *opmode, err = 0;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE
+					    | I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
+		err = -EIO;
+		goto exit;
+	}
+
+	data = kzalloc(sizeof(struct tsl2550_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+	data->client = client;
+	i2c_set_clientdata(client, data);
+
+	/* Check platform data */
+	opmode = client->dev.platform_data;
+	if (opmode) {
+		if (*opmode < 0 || *opmode > 1) {
+			dev_err(&client->dev, "invalid operating_mode (%d)\n",
+					*opmode);
+			err = -EINVAL;
+			goto exit_kfree;
+		}
+		data->operating_mode = *opmode;
+	} else
+		data->operating_mode = 0;	/* default mode is standard */
+	dev_info(&client->dev, "%s operating mode\n",
+			data->operating_mode ? "extended" : "standard");
+
+	mutex_init(&data->update_lock);
+
+	/* Initialize the TSL2550 chip */
+	err = tsl2550_init_client(client);
+	if (err)
+		goto exit_kfree;
+
+	/* Register sysfs hooks */
+	err = sysfs_create_group(&client->dev.kobj, &tsl2550_attr_group);
+	if (err)
+		goto exit_kfree;
+
+	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
+
+	return 0;
+
+exit_kfree:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int __devexit tsl2550_remove(struct i2c_client *client)
+{
+	sysfs_remove_group(&client->dev.kobj, &tsl2550_attr_group);
+
+	/* Power down the device */
+	tsl2550_set_power_state(client, 0);
+
+	kfree(i2c_get_clientdata(client));
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int tsl2550_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+	return tsl2550_set_power_state(client, 0);
+}
+
+static int tsl2550_resume(struct i2c_client *client)
+{
+	return tsl2550_set_power_state(client, 1);
+}
+
+#else
+
+#define tsl2550_suspend		NULL
+#define tsl2550_resume		NULL
+
+#endif /* CONFIG_PM */
+
+static const struct i2c_device_id tsl2550_id[] = {
+	{ "tsl2550", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tsl2550_id);
+
+static struct i2c_driver tsl2550_driver = {
+	.driver = {
+		.name	= TSL2550_DRV_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.suspend = tsl2550_suspend,
+	.resume	= tsl2550_resume,
+	.probe	= tsl2550_probe,
+	.remove	= __devexit_p(tsl2550_remove),
+	.id_table = tsl2550_id,
+};
+
+static int __init tsl2550_init(void)
+{
+	return i2c_add_driver(&tsl2550_driver);
+}
+
+static void __exit tsl2550_exit(void)
+{
+	i2c_del_driver(&tsl2550_driver);
+}
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("TSL2550 ambient light sensor driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRIVER_VERSION);
+
+module_init(tsl2550_init);
+module_exit(tsl2550_exit);