hwmon: New SMSC DME1737 driver

Add support for the hardware monitoring and fan control
capabilities of the SMSC DME1737 and Asus A8000 Super-I/O chips.

The hardware monitoring logic of this chip is similar to the LM85 but
has some additional features that this driver supports. Even though
it's a Super-I/O chip, the hardware monitoring logic can only be
accessed via SMBus.

Signed-off-by: Juerg Haefliger <juergh at gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

3 files changed, 2093 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 13eea47dceb..f848e343b6a 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -442,6 +442,18 @@ config SENSORS_SIS5595
 	  This driver can also be built as a module.  If so, the module
 	  will be called sis5595.
 
+config SENSORS_DME1737
+	tristate "SMSC DME1737 and compatibles"
+	depends on I2C && EXPERIMENTAL
+	select HWMON_VID
+	help
+	  If you say yes here you get support for the hardware monitoring
+	  and fan control features of the SMSC DME1737 (and compatibles
+	  like the Asus A8000) Super-I/O chip.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called dme1737.
+
 config SENSORS_SMSC47M1
 	tristate "SMSC LPC47M10x and compatibles"
 	help
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index cfaf338919d..3618773bf4d 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_SENSORS_APPLESMC)	+= applesmc.o
 obj-$(CONFIG_SENSORS_AMS)	+= ams/
 obj-$(CONFIG_SENSORS_ATXP1)	+= atxp1.o
 obj-$(CONFIG_SENSORS_CORETEMP)	+= coretemp.o
+obj-$(CONFIG_SENSORS_DME1737)	+= dme1737.o
 obj-$(CONFIG_SENSORS_DS1621)	+= ds1621.o
 obj-$(CONFIG_SENSORS_F71805F)	+= f71805f.o
 obj-$(CONFIG_SENSORS_FSCHER)	+= fscher.o
diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
new file mode 100644
index 00000000000..be3aaa5d0b9
--- /dev/null
+++ b/drivers/hwmon/dme1737.c
@@ -0,0 +1,2080 @@
+/*
+ * dme1737.c - driver for the SMSC DME1737 and Asus A8000 Super-I/O chips
+ *             integrated hardware monitoring features.
+ * Copyright (c) 2007 Juerg Haefliger <juergh@gmail.com>
+ *
+ * This driver is based on the LM85 driver. The hardware monitoring
+ * capabilities of the DME1737 are very similar to the LM85 with some
+ * additional features. Even though the DME1737 is a Super-I/O chip, the
+ * hardware monitoring registers are only accessible via SMBus.
+ *
+ * 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/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <asm/io.h>
+
+/* Module load parameters */
+static int force_start;
+module_param(force_start, bool, 0);
+MODULE_PARM_DESC(force_start, "Force the chip to start monitoring inputs");
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = {0x2c, 0x2d, 0x2e, I2C_CLIENT_END};
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(dme1737);
+
+/* ---------------------------------------------------------------------
+ * Registers
+ *
+ * The sensors are defined as follows:
+ *
+ * Voltages                          Temperatures
+ * --------                          ------------
+ * in0   +5VTR (+5V stdby)           temp1   Remote diode 1
+ * in1   Vccp  (proc core)           temp2   Internal temp
+ * in2   VCC   (internal +3.3V)      temp3   Remote diode 2
+ * in3   +5V
+ * in4   +12V
+ * in5   VTR   (+3.3V stby)
+ * in6   Vbat
+ *
+ * --------------------------------------------------------------------- */
+
+/* Voltages (in) numbered 0-6 (ix) */
+#define	DME1737_REG_IN(ix)		((ix) < 5 ? 0x20 + (ix) \
+						  : 0x94 + (ix))
+#define	DME1737_REG_IN_MIN(ix)		((ix) < 5 ? 0x44 + (ix) * 2 \
+						  : 0x91 + (ix) * 2)
+#define	DME1737_REG_IN_MAX(ix)		((ix) < 5 ? 0x45 + (ix) * 2 \
+						  : 0x92 + (ix) * 2)
+
+/* Temperatures (temp) numbered 0-2 (ix) */
+#define DME1737_REG_TEMP(ix)		(0x25 + (ix))
+#define DME1737_REG_TEMP_MIN(ix)	(0x4e + (ix) * 2)
+#define DME1737_REG_TEMP_MAX(ix)	(0x4f + (ix) * 2)
+#define DME1737_REG_TEMP_OFFSET(ix)	((ix) == 0 ? 0x1f \
+						   : 0x1c + (ix))
+
+/* Voltage and temperature LSBs
+ * The LSBs (4 bits each) are stored in 5 registers with the following layouts:
+ *    IN_TEMP_LSB(0) = [in5, in6]
+ *    IN_TEMP_LSB(1) = [temp3, temp1]
+ *    IN_TEMP_LSB(2) = [in4, temp2]
+ *    IN_TEMP_LSB(3) = [in3, in0]
+ *    IN_TEMP_LSB(4) = [in2, in1] */
+#define DME1737_REG_IN_TEMP_LSB(ix)	(0x84 + (ix))
+static const u8 DME1737_REG_IN_LSB[] = {3, 4, 4, 3, 2, 0, 0};
+static const u8 DME1737_REG_IN_LSB_SHL[] = {4, 4, 0, 0, 0, 0, 4};
+static const u8 DME1737_REG_TEMP_LSB[] = {1, 2, 1};
+static const u8 DME1737_REG_TEMP_LSB_SHL[] = {4, 4, 0};
+
+/* Fans numbered 0-5 (ix) */
+#define DME1737_REG_FAN(ix)		((ix) < 4 ? 0x28 + (ix) * 2 \
+						  : 0xa1 + (ix) * 2)
+#define DME1737_REG_FAN_MIN(ix)		((ix) < 4 ? 0x54 + (ix) * 2 \
+						  : 0xa5 + (ix) * 2)
+#define DME1737_REG_FAN_OPT(ix)		((ix) < 4 ? 0x90 + (ix) \
+						  : 0xb2 + (ix))
+#define DME1737_REG_FAN_MAX(ix)		(0xb4 + (ix)) /* only for fan[4-5] */
+
+/* PWMs numbered 0-2, 4-5 (ix) */
+#define DME1737_REG_PWM(ix)		((ix) < 3 ? 0x30 + (ix) \
+						  : 0xa1 + (ix))
+#define DME1737_REG_PWM_CONFIG(ix)	(0x5c + (ix)) /* only for pwm[0-2] */
+#define DME1737_REG_PWM_MIN(ix)		(0x64 + (ix)) /* only for pwm[0-2] */
+#define DME1737_REG_PWM_FREQ(ix)	((ix) < 3 ? 0x5f + (ix) \
+						  : 0xa3 + (ix))
+/* The layout of the ramp rate registers is different from the other pwm
+ * registers. The bits for the 3 PWMs are stored in 2 registers:
+ *    PWM_RR(0) = [OFF3, OFF2,  OFF1,  RES,   RR1E, RR1-2, RR1-1, RR1-0]
+ *    PWM_RR(1) = [RR2E, RR2-2, RR2-1, RR2-0, RR3E, RR3-2, RR3-1, RR3-0] */
+#define DME1737_REG_PWM_RR(ix)		(0x62 + (ix)) /* only for pwm[0-2] */
+
+/* Thermal zones 0-2 */
+#define DME1737_REG_ZONE_LOW(ix)	(0x67 + (ix))
+#define DME1737_REG_ZONE_ABS(ix)	(0x6a + (ix))
+/* The layout of the hysteresis registers is different from the other zone
+ * registers. The bits for the 3 zones are stored in 2 registers:
+ *    ZONE_HYST(0) = [H1-3,  H1-2,  H1-1, H1-0, H2-3, H2-2, H2-1, H2-0]
+ *    ZONE_HYST(1) = [H3-3,  H3-2,  H3-1, H3-0, RES,  RES,  RES,  RES] */
+#define DME1737_REG_ZONE_HYST(ix)	(0x6d + (ix))
+
+/* Alarm registers and bit mapping
+ * The 3 8-bit alarm registers will be concatenated to a single 32-bit
+ * alarm value [0, ALARM3, ALARM2, ALARM1]. */
+#define DME1737_REG_ALARM1		0x41
+#define DME1737_REG_ALARM2		0x42
+#define DME1737_REG_ALARM3		0x83
+static const u8 DME1737_BIT_ALARM_IN[] = {0, 1, 2, 3, 8, 16, 17};
+static const u8 DME1737_BIT_ALARM_TEMP[] = {4, 5, 6};
+static const u8 DME1737_BIT_ALARM_FAN[] = {10, 11, 12, 13, 22, 23};
+
+/* Miscellaneous registers */
+#define DME1737_REG_COMPANY		0x3e
+#define DME1737_REG_VERSTEP		0x3f
+#define DME1737_REG_CONFIG		0x40
+#define DME1737_REG_CONFIG2		0x7f
+#define DME1737_REG_VID			0x43
+#define DME1737_REG_TACH_PWM		0x81
+
+/* ---------------------------------------------------------------------
+ * Misc defines
+ * --------------------------------------------------------------------- */
+
+/* Chip identification */
+#define DME1737_COMPANY_SMSC	0x5c
+#define DME1737_VERSTEP		0x88
+#define DME1737_VERSTEP_MASK	0xf8
+
+/* ---------------------------------------------------------------------
+ * Data structures and manipulation thereof
+ * --------------------------------------------------------------------- */
+
+struct dme1737_data {
+	struct i2c_client client;
+	struct class_device *class_dev;
+
+	struct mutex update_lock;
+	int valid;			/* !=0 if following fields are valid */
+	unsigned long last_update;	/* in jiffies */
+	unsigned long last_vbat;	/* in jiffies */
+
+	u8 vid;
+	u8 pwm_rr_en;
+	u8 has_pwm;
+	u8 has_fan;
+
+	/* Register values */
+	u16 in[7];
+	u8  in_min[7];
+	u8  in_max[7];
+	s16 temp[3];
+	s8  temp_min[3];
+	s8  temp_max[3];
+	s8  temp_offset[3];
+	u8  config;
+	u8  config2;
+	u8  vrm;
+	u16 fan[6];
+	u16 fan_min[6];
+	u8  fan_max[2];
+	u8  fan_opt[6];
+	u8  pwm[6];
+	u8  pwm_min[3];
+	u8  pwm_config[3];
+	u8  pwm_acz[3];
+	u8  pwm_freq[6];
+	u8  pwm_rr[2];
+	u8  zone_low[3];
+	u8  zone_abs[3];
+	u8  zone_hyst[2];
+	u32 alarms;
+};
+
+/* Nominal voltage values */
+static const int IN_NOMINAL[] = {5000, 2250, 3300, 5000, 12000, 3300, 3300};
+
+/* Voltage input
+ * Voltage inputs have 16 bits resolution, limit values have 8 bits
+ * resolution. */
+static inline int IN_FROM_REG(int reg, int ix, int res)
+{
+	return (reg * IN_NOMINAL[ix] + (3 << (res - 3))) / (3 << (res - 2));
+}
+
+static inline int IN_TO_REG(int val, int ix)
+{
+	return SENSORS_LIMIT((val * 192 + IN_NOMINAL[ix] / 2) /
+			     IN_NOMINAL[ix], 0, 255);
+}
+
+/* Temperature input
+ * The register values represent temperatures in 2's complement notation from
+ * -127 degrees C to +127 degrees C. Temp inputs have 16 bits resolution, limit
+ * values have 8 bits resolution. */
+static inline int TEMP_FROM_REG(int reg, int res)
+{
+	return (reg * 1000) >> (res - 8);
+}
+
+static inline int TEMP_TO_REG(int val)
+{
+	return SENSORS_LIMIT((val < 0 ? val - 500 : val + 500) / 1000,
+			     -128, 127);
+}
+
+/* Temperature range */
+static const int TEMP_RANGE[] = {2000, 2500, 3333, 4000, 5000, 6666, 8000,
+				 10000, 13333, 16000, 20000, 26666, 32000,
+				 40000, 53333, 80000};
+
+static inline int TEMP_RANGE_FROM_REG(int reg)
+{
+	return TEMP_RANGE[(reg >> 4) & 0x0f];
+}
+
+static int TEMP_RANGE_TO_REG(int val, int reg)
+{
+	int i;
+
+	for (i = 15; i > 0; i--) {
+		if (val > (TEMP_RANGE[i] + TEMP_RANGE[i - 1] + 1) / 2) {
+			break;
+		}
+	}
+
+	return (reg & 0x0f) | (i << 4);
+}
+
+/* Temperature hysteresis
+ * Register layout:
+ *    reg[0] = [H1-3, H1-2, H1-1, H1-0, H2-3, H2-2, H2-1, H2-0]
+ *    reg[1] = [H3-3, H3-2, H3-1, H3-0, xxxx, xxxx, xxxx, xxxx] */
+static inline int TEMP_HYST_FROM_REG(int reg, int ix)
+{
+	return (((ix == 1) ? reg : reg >> 4) & 0x0f) * 1000;
+}
+
+static inline int TEMP_HYST_TO_REG(int val, int ix, int reg)
+{
+	int hyst = SENSORS_LIMIT((val + 500) / 1000, 0, 15);
+
+	return (ix == 1) ? (reg & 0xf0) | hyst : (reg & 0x0f) | (hyst << 4);
+}
+
+/* Fan input RPM */
+static inline int FAN_FROM_REG(int reg, int tpc)
+{
+	return (reg == 0 || reg == 0xffff) ? 0 :
+		(tpc == 0) ? 90000 * 60 / reg : tpc * reg;
+}
+
+static inline int FAN_TO_REG(int val, int tpc)
+{
+	return SENSORS_LIMIT((tpc == 0) ? 90000 * 60 / val : val / tpc,
+			     0, 0xffff);
+}
+
+/* Fan TPC (tach pulse count)
+ * Converts a register value to a TPC multiplier or returns 0 if the tachometer
+ * is configured in legacy (non-tpc) mode */
+static inline int FAN_TPC_FROM_REG(int reg)
+{
+	return (reg & 0x20) ? 0 : 60 >> (reg & 0x03);
+}
+
+/* Fan type
+ * The type of a fan is expressed in number of pulses-per-revolution that it
+ * emits */
+static inline int FAN_TYPE_FROM_REG(int reg)
+{
+	int edge = (reg >> 1) & 0x03;
+
+	return (edge > 0) ? 1 << (edge - 1) : 0;
+}
+
+static inline int FAN_TYPE_TO_REG(int val, int reg)
+{
+	int edge = (val == 4) ? 3 : val;
+
+	return (reg & 0xf9) | (edge << 1);
+}
+
+/* Fan max RPM */
+static const int FAN_MAX[] = {0x54, 0x38, 0x2a, 0x21, 0x1c, 0x18, 0x15, 0x12,
+			      0x11, 0x0f, 0x0e};
+
+static int FAN_MAX_FROM_REG(int reg)
+{
+	int i;
+
+	for (i = 10; i > 0; i--) {
+		if (reg == FAN_MAX[i]) {
+			break;
+		}
+	}
+
+	return 1000 + i * 500;
+}
+
+static int FAN_MAX_TO_REG(int val)
+{
+	int i;
+
+	for (i = 10; i > 0; i--) {
+		if (val > (1000 + (i - 1) * 500)) {
+			break;
+		}
+	}
+
+	return FAN_MAX[i];
+}
+
+/* PWM enable
+ * Register to enable mapping:
+ * 000:  2  fan on zone 1 auto
+ * 001:  2  fan on zone 2 auto
+ * 010:  2  fan on zone 3 auto
+ * 011:  0  fan full on
+ * 100: -1  fan disabled
+ * 101:  2  fan on hottest of zones 2,3 auto
+ * 110:  2  fan on hottest of zones 1,2,3 auto
+ * 111:  1  fan in manual mode */
+static inline int PWM_EN_FROM_REG(int reg)
+{
+	static const int en[] = {2, 2, 2, 0, -1, 2, 2, 1};
+
+	return en[(reg >> 5) & 0x07];
+}
+
+static inline int PWM_EN_TO_REG(int val, int reg)
+{
+	int en = (val == 1) ? 7 : 3;
+
+	return (reg & 0x1f) | ((en & 0x07) << 5);
+}
+
+/* PWM auto channels zone
+ * Register to auto channels zone mapping (ACZ is a bitfield with bit x
+ * corresponding to zone x+1):
+ * 000: 001  fan on zone 1 auto
+ * 001: 010  fan on zone 2 auto
+ * 010: 100  fan on zone 3 auto
+ * 011: 000  fan full on
+ * 100: 000  fan disabled
+ * 101: 110  fan on hottest of zones 2,3 auto
+ * 110: 111  fan on hottest of zones 1,2,3 auto
+ * 111: 000  fan in manual mode */
+static inline int PWM_ACZ_FROM_REG(int reg)
+{
+	static const int acz[] = {1, 2, 4, 0, 0, 6, 7, 0};
+
+	return acz[(reg >> 5) & 0x07];
+}
+
+static inline int PWM_ACZ_TO_REG(int val, int reg)
+{
+	int acz = (val == 4) ? 2 : val - 1;
+
+	return (reg & 0x1f) | ((acz & 0x07) << 5);
+}
+
+/* PWM frequency */
+static const int PWM_FREQ[] = {11, 15, 22, 29, 35, 44, 59, 88,
+			       15000, 20000, 30000, 25000, 0, 0, 0, 0};
+
+static inline int PWM_FREQ_FROM_REG(int reg)
+{
+	return PWM_FREQ[reg & 0x0f];
+}
+
+static int PWM_FREQ_TO_REG(int val, int reg)
+{
+	int i;
+
+	/* the first two cases are special - stupid chip design! */
+	if (val > 27500) {
+		i = 10;
+	} else if (val > 22500) {
+		i = 11;
+	} else {
+		for (i = 9; i > 0; i--) {
+			if (val > (PWM_FREQ[i] + PWM_FREQ[i - 1] + 1) / 2) {
+				break;
+			}
+		}
+	}
+
+	return (reg & 0xf0) | i;
+}
+
+/* PWM ramp rate
+ * Register layout:
+ *    reg[0] = [OFF3,  OFF2,  OFF1,  RES,   RR1-E, RR1-2, RR1-1, RR1-0]
+ *    reg[1] = [RR2-E, RR2-2, RR2-1, RR2-0, RR3-E, RR3-2, RR3-1, RR3-0] */
+static const u8 PWM_RR[] = {206, 104, 69, 41, 26, 18, 10, 5};
+
+static inline int PWM_RR_FROM_REG(int reg, int ix)
+{
+	int rr = (ix == 1) ? reg >> 4 : reg;
+
+	return (rr & 0x08) ? PWM_RR[rr & 0x07] : 0;
+}
+
+static int PWM_RR_TO_REG(int val, int ix, int reg)
+{
+	int i;
+
+	for (i = 0; i < 7; i++) {
+		if (val > (PWM_RR[i] + PWM_RR[i + 1] + 1) / 2) {
+			break;
+		}
+	}
+
+	return (ix == 1) ? (reg & 0x8f) | (i << 4) : (reg & 0xf8) | i;
+}
+
+/* PWM ramp rate enable */
+static inline int PWM_RR_EN_FROM_REG(int reg, int ix)
+{
+	return PWM_RR_FROM_REG(reg, ix) ? 1 : 0;
+}
+
+static inline int PWM_RR_EN_TO_REG(int val, int ix, int reg)
+{
+	int en = (ix == 1) ? 0x80 : 0x08;
+
+	return val ? reg | en : reg & ~en;
+}
+
+/* PWM min/off
+ * The PWM min/off bits are part of the PMW ramp rate register 0 (see above for
+ * the register layout). */
+static inline int PWM_OFF_FROM_REG(int reg, int ix)
+{
+	return (reg >> (ix + 5)) & 0x01;
+}
+
+static inline int PWM_OFF_TO_REG(int val, int ix, int reg)
+{
+	return (reg & ~(1 << (ix + 5))) | ((val & 0x01) << (ix + 5));
+}
+
+/* ---------------------------------------------------------------------
+ * Device I/O access
+ * --------------------------------------------------------------------- */
+
+static u8 dme1737_read(struct i2c_client *client, u8 reg)
+{
+	s32 val = i2c_smbus_read_byte_data(client, reg);
+
+	if (val < 0) {
+		dev_warn(&client->dev, "Read from register 0x%02x failed! "
+			 "Please report to the driver maintainer.\n", reg);
+	}
+
+	return val;
+}
+
+static s32 dme1737_write(struct i2c_client *client, u8 reg, u8 value)
+{
+	s32 res = i2c_smbus_write_byte_data(client, reg, value);
+
+	if (res < 0) {
+		dev_warn(&client->dev, "Write to register 0x%02x failed! "
+			 "Please report to the driver maintainer.\n", reg);
+	}
+
+	return res;
+}
+
+static struct dme1737_data *dme1737_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	int ix;
+	u8 lsb[5];
+
+	mutex_lock(&data->update_lock);
+
+	/* Enable a Vbat monitoring cycle every 10 mins */
+	if (time_after(jiffies, data->last_vbat + 600 * HZ) || !data->valid) {
+		dme1737_write(client, DME1737_REG_CONFIG, dme1737_read(client,
+						DME1737_REG_CONFIG) | 0x10);
+		data->last_vbat = jiffies;
+	}
+
+	/* Sample register contents every 1 sec */
+	if (time_after(jiffies, data->last_update + HZ) || !data->valid) {
+		data->vid = dme1737_read(client, DME1737_REG_VID) & 0x3f;
+
+		/* In (voltage) registers */
+		for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
+			/* Voltage inputs are stored as 16 bit values even
+			 * though they have only 12 bits resolution. This is
+			 * to make it consistent with the temp inputs. */
+			data->in[ix] = dme1737_read(client,
+					DME1737_REG_IN(ix)) << 8;
+			data->in_min[ix] = dme1737_read(client,
+					DME1737_REG_IN_MIN(ix));
+			data->in_max[ix] = dme1737_read(client,
+					DME1737_REG_IN_MAX(ix));
+		}
+
+		/* Temp registers */
+		for (ix = 0; ix < ARRAY_SIZE(data->temp); ix++) {
+			/* Temp inputs are stored as 16 bit values even
+			 * though they have only 12 bits resolution. This is
+			 * to take advantage of implicit conversions between
+			 * register values (2's complement) and temp values
+			 * (signed decimal). */
+			data->temp[ix] = dme1737_read(client,
+					DME1737_REG_TEMP(ix)) << 8;
+			data->temp_min[ix] = dme1737_read(client,
+					DME1737_REG_TEMP_MIN(ix));
+			data->temp_max[ix] = dme1737_read(client,
+					DME1737_REG_TEMP_MAX(ix));
+			data->temp_offset[ix] = dme1737_read(client,
+					DME1737_REG_TEMP_OFFSET(ix));
+		}
+
+		/* In and temp LSB registers
+		 * The LSBs are latched when the MSBs are read, so the order in
+		 * which the registers are read (MSB first, then LSB) is
+		 * important! */
+		for (ix = 0; ix < ARRAY_SIZE(lsb); ix++) {
+			lsb[ix] = dme1737_read(client,
+					DME1737_REG_IN_TEMP_LSB(ix));
+		}
+		for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
+			data->in[ix] |= (lsb[DME1737_REG_IN_LSB[ix]] <<
+					DME1737_REG_IN_LSB_SHL[ix]) & 0xf0;
+		}
+		for (ix = 0; ix < ARRAY_SIZE(data->temp); ix++) {
+			data->temp[ix] |= (lsb[DME1737_REG_TEMP_LSB[ix]] <<
+					DME1737_REG_TEMP_LSB_SHL[ix]) & 0xf0;
+		}
+
+		/* Fan registers */
+		for (ix = 0; ix < ARRAY_SIZE(data->fan); ix++) {
+			/* Skip reading registers if optional fans are not
+			 * present */
+			if (!(data->has_fan & (1 << ix))) {
+				continue;
+			}
+			data->fan[ix] = dme1737_read(client,
+					DME1737_REG_FAN(ix));
+			data->fan[ix] |= dme1737_read(client,
+					DME1737_REG_FAN(ix) + 1) << 8;
+			data->fan_min[ix] = dme1737_read(client,
+					DME1737_REG_FAN_MIN(ix));
+			data->fan_min[ix] |= dme1737_read(client,
+					DME1737_REG_FAN_MIN(ix) + 1) << 8;
+			data->fan_opt[ix] = dme1737_read(client,
+					DME1737_REG_FAN_OPT(ix));
+			/* fan_max exists only for fan[5-6] */
+			if (ix > 3) {
+				data->fan_max[ix - 4] = dme1737_read(client,
+					DME1737_REG_FAN_MAX(ix));
+			}
+		}
+
+		/* PWM registers */
+		for (ix = 0; ix < ARRAY_SIZE(data->pwm); ix++) {
+			/* Skip reading registers if optional PWMs are not
+			 * present */
+			if (!(data->has_pwm & (1 << ix))) {
+				continue;
+			}
+			data->pwm[ix] = dme1737_read(client,
+					DME1737_REG_PWM(ix));
+			data->pwm_freq[ix] = dme1737_read(client,
+					DME1737_REG_PWM_FREQ(ix));
+			/* pwm_config and pwm_min exist only for pwm[1-3] */
+			if (ix < 3) {
+				data->pwm_config[ix] = dme1737_read(client,
+						DME1737_REG_PWM_CONFIG(ix));
+				data->pwm_min[ix] = dme1737_read(client,
+						DME1737_REG_PWM_MIN(ix));
+			}
+		}
+		for (ix = 0; ix < ARRAY_SIZE(data->pwm_rr); ix++) {
+			data->pwm_rr[ix] = dme1737_read(client,
+						DME1737_REG_PWM_RR(ix));
+		}
+
+		/* Thermal zone registers */
+		for (ix = 0; ix < ARRAY_SIZE(data->zone_low); ix++) {
+			data->zone_low[ix] = dme1737_read(client,
+					DME1737_REG_ZONE_LOW(ix));
+			data->zone_abs[ix] = dme1737_read(client,
+					DME1737_REG_ZONE_ABS(ix));
+		}
+		for (ix = 0; ix < ARRAY_SIZE(data->zone_hyst); ix++) {
+			data->zone_hyst[ix] = dme1737_read(client,
+						DME1737_REG_ZONE_HYST(ix));
+		}
+
+		/* Alarm registers */
+		data->alarms = dme1737_read(client,
+						DME1737_REG_ALARM1);
+		/* Bit 7 tells us if the other alarm registers are non-zero and
+		 * therefore also need to be read */
+		if (data->alarms & 0x80) {
+			data->alarms |= dme1737_read(client,
+						DME1737_REG_ALARM2) << 8;
+			data->alarms |= dme1737_read(client,
+						DME1737_REG_ALARM3) << 16;
+		}
+
+		data->last_update = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->update_lock);
+
+	return data;
+}
+
+/* ---------------------------------------------------------------------
+ * Voltage sysfs attributes
+ * ix = [0-5]
+ * --------------------------------------------------------------------- */
+
+#define SYS_IN_INPUT	0
+#define SYS_IN_MIN	1
+#define SYS_IN_MAX	2
+#define SYS_IN_ALARM	3
+
+static ssize_t show_in(struct device *dev, struct device_attribute *attr,
+		       char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	int res;
+
+	switch (fn) {
+	case SYS_IN_INPUT:
+		res = IN_FROM_REG(data->in[ix], ix, 16);
+		break;
+	case SYS_IN_MIN:
+		res = IN_FROM_REG(data->in_min[ix], ix, 8);
+		break;
+	case SYS_IN_MAX:
+		res = IN_FROM_REG(data->in_max[ix], ix, 8);
+		break;
+	case SYS_IN_ALARM:
+		res = (data->alarms >> DME1737_BIT_ALARM_IN[ix]) & 0x01;
+		break;
+	default:
+		res = 0;
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+
+	return sprintf(buf, "%d\n", res);
+}
+
+static ssize_t set_in(struct device *dev, struct device_attribute *attr,
+		      const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	long val = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->update_lock);
+	switch (fn) {
+	case SYS_IN_MIN:
+		data->in_min[ix] = IN_TO_REG(val, ix);
+		dme1737_write(client, DME1737_REG_IN_MIN(ix),
+			      data->in_min[ix]);
+		break;
+	case SYS_IN_MAX:
+		data->in_max[ix] = IN_TO_REG(val, ix);
+		dme1737_write(client, DME1737_REG_IN_MAX(ix),
+			      data->in_max[ix]);
+		break;
+	default:
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/* ---------------------------------------------------------------------
+ * Temperature sysfs attributes
+ * ix = [0-2]
+ * --------------------------------------------------------------------- */
+
+#define SYS_TEMP_INPUT			0
+#define SYS_TEMP_MIN			1
+#define SYS_TEMP_MAX			2
+#define SYS_TEMP_OFFSET			3
+#define SYS_TEMP_ALARM			4
+#define SYS_TEMP_FAULT			5
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	int res;
+
+	switch (fn) {
+	case SYS_TEMP_INPUT:
+		res = TEMP_FROM_REG(data->temp[ix], 16);
+		break;
+	case SYS_TEMP_MIN:
+		res = TEMP_FROM_REG(data->temp_min[ix], 8);
+		break;
+	case SYS_TEMP_MAX:
+		res = TEMP_FROM_REG(data->temp_max[ix], 8);
+		break;
+	case SYS_TEMP_OFFSET:
+		res = TEMP_FROM_REG(data->temp_offset[ix], 8);
+		break;
+	case SYS_TEMP_ALARM:
+		res = (data->alarms >> DME1737_BIT_ALARM_TEMP[ix]) & 0x01;
+		break;
+	case SYS_TEMP_FAULT:
+		res = (data->temp[ix] == 0x0800);
+		break;
+	default:
+		res = 0;
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+
+	return sprintf(buf, "%d\n", res);
+}
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	long val = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->update_lock);
+	switch (fn) {
+	case SYS_TEMP_MIN:
+		data->temp_min[ix] = TEMP_TO_REG(val);
+		dme1737_write(client, DME1737_REG_TEMP_MIN(ix),
+			      data->temp_min[ix]);
+		break;
+	case SYS_TEMP_MAX:
+		data->temp_max[ix] = TEMP_TO_REG(val);
+		dme1737_write(client, DME1737_REG_TEMP_MAX(ix),
+			      data->temp_max[ix]);
+		break;
+	case SYS_TEMP_OFFSET:
+		data->temp_offset[ix] = TEMP_TO_REG(val);
+		dme1737_write(client, DME1737_REG_TEMP_OFFSET(ix),
+			      data->temp_offset[ix]);
+		break;
+	default:
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/* ---------------------------------------------------------------------
+ * Zone sysfs attributes
+ * ix = [0-2]
+ * --------------------------------------------------------------------- */
+
+#define SYS_ZONE_AUTO_CHANNELS_TEMP	0
+#define SYS_ZONE_AUTO_POINT1_TEMP_HYST	1
+#define SYS_ZONE_AUTO_POINT1_TEMP	2
+#define SYS_ZONE_AUTO_POINT2_TEMP	3
+#define SYS_ZONE_AUTO_POINT3_TEMP	4
+
+static ssize_t show_zone(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	int res;
+
+	switch (fn) {
+	case SYS_ZONE_AUTO_CHANNELS_TEMP:
+		/* check config2 for non-standard temp-to-zone mapping */
+		if ((ix == 1) && (data->config2 & 0x02)) {
+			res = 4;
+		} else {
+			res = 1 << ix;
+		}
+		break;
+	case SYS_ZONE_AUTO_POINT1_TEMP_HYST:
+		res = TEMP_FROM_REG(data->zone_low[ix], 8) -
+		      TEMP_HYST_FROM_REG(data->zone_hyst[ix == 2], ix);
+		break;
+	case SYS_ZONE_AUTO_POINT1_TEMP:
+		res = TEMP_FROM_REG(data->zone_low[ix], 8);
+		break;
+	case SYS_ZONE_AUTO_POINT2_TEMP:
+		/* pwm_freq holds the temp range bits in the upper nibble */
+		res = TEMP_FROM_REG(data->zone_low[ix], 8) +
+		      TEMP_RANGE_FROM_REG(data->pwm_freq[ix]);
+		break;
+	case SYS_ZONE_AUTO_POINT3_TEMP:
+		res = TEMP_FROM_REG(data->zone_abs[ix], 8);
+		break;
+	default:
+		res = 0;
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+
+	return sprintf(buf, "%d\n", res);
+}
+
+static ssize_t set_zone(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	long val = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->update_lock);
+	switch (fn) {
+	case SYS_ZONE_AUTO_POINT1_TEMP_HYST:
+		/* Refresh the cache */
+		data->zone_low[ix] = dme1737_read(client,
+						  DME1737_REG_ZONE_LOW(ix));
+		/* Modify the temp hyst value */
+		data->zone_hyst[ix == 2] = TEMP_HYST_TO_REG(
+					TEMP_FROM_REG(data->zone_low[ix], 8) -
+					val, ix, dme1737_read(client,
+					DME1737_REG_ZONE_HYST(ix == 2)));
+		dme1737_write(client, DME1737_REG_ZONE_HYST(ix == 2),
+			      data->zone_hyst[ix == 2]);
+		break;
+	case SYS_ZONE_AUTO_POINT1_TEMP:
+		data->zone_low[ix] = TEMP_TO_REG(val);
+		dme1737_write(client, DME1737_REG_ZONE_LOW(ix),
+			      data->zone_low[ix]);
+		break;
+	case SYS_ZONE_AUTO_POINT2_TEMP:
+		/* Refresh the cache */
+		data->zone_low[ix] = dme1737_read(client,
+						  DME1737_REG_ZONE_LOW(ix));
+		/* Modify the temp range value (which is stored in the upper
+		 * nibble of the pwm_freq register) */
+		data->pwm_freq[ix] = TEMP_RANGE_TO_REG(val -
+					TEMP_FROM_REG(data->zone_low[ix], 8),
+					dme1737_read(client,
+					DME1737_REG_PWM_FREQ(ix)));
+		dme1737_write(client, DME1737_REG_PWM_FREQ(ix),
+			      data->pwm_freq[ix]);
+		break;
+	case SYS_ZONE_AUTO_POINT3_TEMP:
+		data->zone_abs[ix] = TEMP_TO_REG(val);
+		dme1737_write(client, DME1737_REG_ZONE_ABS(ix),
+			      data->zone_abs[ix]);
+		break;
+	default:
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/* ---------------------------------------------------------------------
+ * Fan sysfs attributes
+ * ix = [0-5]
+ * --------------------------------------------------------------------- */
+
+#define SYS_FAN_INPUT	0
+#define SYS_FAN_MIN	1
+#define SYS_FAN_MAX	2
+#define SYS_FAN_ALARM	3
+#define SYS_FAN_TYPE	4
+
+static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	int res;
+
+	switch (fn) {
+	case SYS_FAN_INPUT:
+		res = FAN_FROM_REG(data->fan[ix],
+				   ix < 4 ? 0 :
+				   FAN_TPC_FROM_REG(data->fan_opt[ix]));
+		break;
+	case SYS_FAN_MIN:
+		res = FAN_FROM_REG(data->fan_min[ix],
+				   ix < 4 ? 0 :
+				   FAN_TPC_FROM_REG(data->fan_opt[ix]));
+		break;
+	case SYS_FAN_MAX:
+		/* only valid for fan[5-6] */
+		res = FAN_MAX_FROM_REG(data->fan_max[ix - 4]);
+		break;
+	case SYS_FAN_ALARM:
+		res = (data->alarms >> DME1737_BIT_ALARM_FAN[ix]) & 0x01;
+		break;
+	case SYS_FAN_TYPE:
+		/* only valid for fan[1-4] */
+		res = FAN_TYPE_FROM_REG(data->fan_opt[ix]);
+		break;
+	default:
+		res = 0;
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+
+	return sprintf(buf, "%d\n", res);
+}
+
+static ssize_t set_fan(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	long val = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->update_lock);
+	switch (fn) {
+	case SYS_FAN_MIN:
+		if (ix < 4) {
+			data->fan_min[ix] = FAN_TO_REG(val, 0);
+		} else {
+			/* Refresh the cache */
+			data->fan_opt[ix] = dme1737_read(client,
+						DME1737_REG_FAN_OPT(ix));
+			/* Modify the fan min value */
+			data->fan_min[ix] = FAN_TO_REG(val,
+					FAN_TPC_FROM_REG(data->fan_opt[ix]));
+		}
+		dme1737_write(client, DME1737_REG_FAN_MIN(ix),
+			      data->fan_min[ix] & 0xff);
+		dme1737_write(client, DME1737_REG_FAN_MIN(ix) + 1,
+			      data->fan_min[ix] >> 8);
+		break;
+	case SYS_FAN_MAX:
+		/* Only valid for fan[5-6] */
+		data->fan_max[ix - 4] = FAN_MAX_TO_REG(val);
+		dme1737_write(client, DME1737_REG_FAN_MAX(ix),
+			      data->fan_max[ix - 4]);
+		break;
+	case SYS_FAN_TYPE:
+		/* Only valid for fan[1-4] */
+		if (!(val == 1 || val == 2 || val == 4)) {
+			count = -EINVAL;
+			dev_warn(&client->dev, "Fan type value %ld not "
+				 "supported. Choose one of 1, 2, or 4.\n",
+				 val);
+			goto exit;
+		}
+		data->fan_opt[ix] = FAN_TYPE_TO_REG(val, dme1737_read(client,
+					DME1737_REG_FAN_OPT(ix)));
+		dme1737_write(client, DME1737_REG_FAN_OPT(ix),
+			      data->fan_opt[ix]);
+		break;
+	default:
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+exit:
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/* ---------------------------------------------------------------------
+ * PWM sysfs attributes
+ * ix = [0-4]
+ * --------------------------------------------------------------------- */
+
+#define SYS_PWM				0
+#define SYS_PWM_FREQ			1
+#define SYS_PWM_ENABLE			2
+#define SYS_PWM_RAMP_RATE		3
+#define SYS_PWM_AUTO_CHANNELS_ZONE	4
+#define SYS_PWM_AUTO_PWM_MIN		5
+#define SYS_PWM_AUTO_POINT1_PWM		6
+#define SYS_PWM_AUTO_POINT2_PWM		7
+
+static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	int res;
+
+	switch (fn) {
+	case SYS_PWM:
+		if (PWM_EN_FROM_REG(data->pwm_config[ix]) == 0) {
+			res = 255;
+		} else {
+			res = data->pwm[ix];
+		}
+		break;
+	case SYS_PWM_FREQ:
+		res = PWM_FREQ_FROM_REG(data->pwm_freq[ix]);
+		break;
+	case SYS_PWM_ENABLE:
+		if (ix > 3) {
+			res = 1; /* pwm[5-6] hard-wired to manual mode */
+		} else {
+			res = PWM_EN_FROM_REG(data->pwm_config[ix]);
+		}
+		break;
+	case SYS_PWM_RAMP_RATE:
+		/* Only valid for pwm[1-3] */
+		res = PWM_RR_FROM_REG(data->pwm_rr[ix > 0], ix);
+		break;
+	case SYS_PWM_AUTO_CHANNELS_ZONE:
+		/* Only valid for pwm[1-3] */
+		if (PWM_EN_FROM_REG(data->pwm_config[ix]) == 2) {
+			res = PWM_ACZ_FROM_REG(data->pwm_config[ix]);
+		} else {
+			res = data->pwm_acz[ix];
+		}
+		break;
+	case SYS_PWM_AUTO_PWM_MIN:
+		/* Only valid for pwm[1-3] */
+		if (PWM_OFF_FROM_REG(data->pwm_rr[0], ix)) {
+			res = data->pwm_min[ix];
+		} else {
+			res = 0;
+		}
+		break;
+	case SYS_PWM_AUTO_POINT1_PWM:
+		/* Only valid for pwm[1-3] */
+		res = data->pwm_min[ix];
+		break;
+	case SYS_PWM_AUTO_POINT2_PWM:
+		/* Only valid for pwm[1-3] */
+		res = 255; /* hard-wired */
+		break;
+	default:
+		res = 0;
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+
+	return sprintf(buf, "%d\n", res);
+}
+
+static struct attribute *dme1737_attr_pwm[];
+static void dme1737_chmod_file(struct i2c_client*, struct attribute*, mode_t);
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	struct sensor_device_attribute_2
+		*sensor_attr_2 = to_sensor_dev_attr_2(attr);
+	int ix = sensor_attr_2->index;
+	int fn = sensor_attr_2->nr;
+	long val = simple_strtol(buf, NULL, 10);
+
+	mutex_lock(&data->update_lock);
+	switch (fn) {
+	case SYS_PWM:
+		data->pwm[ix] = SENSORS_LIMIT(val, 0, 255);
+		dme1737_write(client, DME1737_REG_PWM(ix), data->pwm[ix]);
+		break;
+	case SYS_PWM_FREQ:
+		data->pwm_freq[ix] = PWM_FREQ_TO_REG(val, dme1737_read(client,
+						DME1737_REG_PWM_FREQ(ix)));
+		dme1737_write(client, DME1737_REG_PWM_FREQ(ix),
+			      data->pwm_freq[ix]);
+		break;
+	case SYS_PWM_ENABLE:
+		/* Only valid for pwm[1-3] */
+		if (val < 0 || val > 2) {
+			count = -EINVAL;
+			dev_warn(&client->dev, "PWM enable %ld not "
+				 "supported. Choose one of 0, 1, or 2.\n",
+				 val);
+			goto exit;
+		}
+		/* Refresh the cache */
+		data->pwm_config[ix] = dme1737_read(client,
+						DME1737_REG_PWM_CONFIG(ix));
+		if (val == PWM_EN_FROM_REG(data->pwm_config[ix])) {
+			/* Bail out if no change */
+			goto exit;
+		}
+		/* Do some housekeeping if we are currently in auto mode */
+		if (PWM_EN_FROM_REG(data->pwm_config[ix]) == 2) {
+			/* Save the current zone channel assignment */
+			data->pwm_acz[ix] = PWM_ACZ_FROM_REG(
+							data->pwm_config[ix]);
+			/* Save the current ramp rate state and disable it */
+			data->pwm_rr[ix > 0] = dme1737_read(client,
+						DME1737_REG_PWM_RR(ix > 0));
+			data->pwm_rr_en &= ~(1 << ix);
+			if (PWM_RR_EN_FROM_REG(data->pwm_rr[ix > 0], ix)) {
+				data->pwm_rr_en |= (1 << ix);
+				data->pwm_rr[ix > 0] = PWM_RR_EN_TO_REG(0, ix,
+							data->pwm_rr[ix > 0]);
+				dme1737_write(client,
+					      DME1737_REG_PWM_RR(ix > 0),
+					      data->pwm_rr[ix > 0]);
+			}
+		}
+		/* Set the new PWM mode */
+		switch (val) {
+		case 0:
+			/* Change permissions of pwm[ix] to read-only */
+			dme1737_chmod_file(client, dme1737_attr_pwm[ix],
+					   S_IRUGO);
+			/* Turn fan fully on */
+			data->pwm_config[ix] = PWM_EN_TO_REG(0,
+							data->pwm_config[ix]);
+			dme1737_write(client, DME1737_REG_PWM_CONFIG(ix),
+				      data->pwm_config[ix]);
+			break;
+		case 1:
+			/* Turn on manual mode */
+			data->pwm_config[ix] = PWM_EN_TO_REG(1,
+							data->pwm_config[ix]);
+			dme1737_write(client, DME1737_REG_PWM_CONFIG(ix),
+				      data->pwm_config[ix]);
+			/* Change permissions of pwm[ix] to read-writeable */
+			dme1737_chmod_file(client, dme1737_attr_pwm[ix],
+					   S_IRUGO | S_IWUSR);
+			break;
+		case 2:
+			/* Change permissions of pwm[ix] to read-only */
+			dme1737_chmod_file(client, dme1737_attr_pwm[ix],
+					   S_IRUGO);
+			/* Turn on auto mode using the saved zone channel
+			 * assignment */
+			data->pwm_config[ix] = PWM_ACZ_TO_REG(
+							data->pwm_acz[ix],
+							data->pwm_config[ix]);
+			dme1737_write(client, DME1737_REG_PWM_CONFIG(ix),
+				      data->pwm_config[ix]);
+			/* Enable PWM ramp rate if previously enabled */
+			if (data->pwm_rr_en & (1 << ix)) {
+				data->pwm_rr[ix > 0] = PWM_RR_EN_TO_REG(1, ix,
+						dme1737_read(client,
+						DME1737_REG_PWM_RR(ix > 0)));
+				dme1737_write(client,
+					      DME1737_REG_PWM_RR(ix > 0),
+					      data->pwm_rr[ix > 0]);
+			}
+			break;
+		}
+		break;
+	case SYS_PWM_RAMP_RATE:
+		/* Only valid for pwm[1-3] */
+		/* Refresh the cache */
+		data->pwm_config[ix] = dme1737_read(client,
+						DME1737_REG_PWM_CONFIG(ix));
+		data->pwm_rr[ix > 0] = dme1737_read(client,
+						DME1737_REG_PWM_RR(ix > 0));
+		/* Set the ramp rate value */
+		if (val > 0) {
+			data->pwm_rr[ix > 0] = PWM_RR_TO_REG(val, ix,
+							data->pwm_rr[ix > 0]);
+		}
+		/* Enable/disable the feature only if the associated PWM
+		 * output is in automatic mode. */
+		if (PWM_EN_FROM_REG(data->pwm_config[ix]) == 2) {
+			data->pwm_rr[ix > 0] = PWM_RR_EN_TO_REG(val > 0, ix,
+							data->pwm_rr[ix > 0]);
+		}
+		dme1737_write(client, DME1737_REG_PWM_RR(ix > 0),
+			      data->pwm_rr[ix > 0]);
+		break;
+	case SYS_PWM_AUTO_CHANNELS_ZONE:
+		/* Only valid for pwm[1-3] */
+		if (!(val == 1 || val == 2 || val == 4 ||
+		      val == 6 || val == 7)) {
+			count = -EINVAL;
+			dev_warn(&client->dev, "PWM auto channels zone %ld "
+				 "not supported. Choose one of 1, 2, 4, 6, "
+				 "or 7.\n", val);
+			goto exit;
+		}
+		/* Refresh the cache */
+		data->pwm_config[ix] = dme1737_read(client,
+						DME1737_REG_PWM_CONFIG(ix));
+		if (PWM_EN_FROM_REG(data->pwm_config[ix]) == 2) {
+			/* PWM is already in auto mode so update the temp
+			 * channel assignment */
+			data->pwm_config[ix] = PWM_ACZ_TO_REG(val,
+						data->pwm_config[ix]);
+			dme1737_write(client, DME1737_REG_PWM_CONFIG(ix),
+				      data->pwm_config[ix]);
+		} else {
+			/* PWM is not in auto mode so we save the temp
+			 * channel assignment for later use */
+			data->pwm_acz[ix] = val;
+		}
+		break;
+	case SYS_PWM_AUTO_PWM_MIN:
+		/* Only valid for pwm[1-3] */
+		/* Refresh the cache */
+		data->pwm_min[ix] = dme1737_read(client,
+						DME1737_REG_PWM_MIN(ix));
+		/* There are only 2 values supported for the auto_pwm_min
+		 * value: 0 or auto_point1_pwm. So if the temperature drops
+		 * below the auto_point1_temp_hyst value, the fan either turns
+		 * off or runs at auto_point1_pwm duty-cycle. */
+		if (val > ((data->pwm_min[ix] + 1) / 2)) {
+			data->pwm_rr[0] = PWM_OFF_TO_REG(1, ix,
+						dme1737_read(client,
+						DME1737_REG_PWM_RR(0)));
+
+		} else {
+			data->pwm_rr[0] = PWM_OFF_TO_REG(0, ix,
+						dme1737_read(client,
+						DME1737_REG_PWM_RR(0)));
+
+		}
+		dme1737_write(client, DME1737_REG_PWM_RR(0),
+			      data->pwm_rr[0]);
+		break;
+	case SYS_PWM_AUTO_POINT1_PWM:
+		/* Only valid for pwm[1-3] */
+		data->pwm_min[ix] = SENSORS_LIMIT(val, 0, 255);
+		dme1737_write(client, DME1737_REG_PWM_MIN(ix),
+			      data->pwm_min[ix]);
+		break;
+	default:
+		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
+	}
+exit:
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
+/* ---------------------------------------------------------------------
+ * Miscellaneous sysfs attributes
+ * --------------------------------------------------------------------- */
+
+static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+
+	return sprintf(buf, "%d\n", data->vrm);
+}
+
+static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
+		       const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	long val = simple_strtol(buf, NULL, 10);
+
+	data->vrm = val;
+	return count;
+}
+
+static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	struct dme1737_data *data = dme1737_update_device(dev);
+
+	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
+}
+
+/* ---------------------------------------------------------------------
+ * Sysfs device attribute defines and structs
+ * --------------------------------------------------------------------- */
+
+/* Voltages 0-6 */
+
+#define SENSOR_DEVICE_ATTR_IN(ix) \
+static SENSOR_DEVICE_ATTR_2(in##ix##_input, S_IRUGO, \
+        show_in, NULL, SYS_IN_INPUT, ix); \
+static SENSOR_DEVICE_ATTR_2(in##ix##_min, S_IRUGO | S_IWUSR, \
+        show_in, set_in, SYS_IN_MIN, ix); \
+static SENSOR_DEVICE_ATTR_2(in##ix##_max, S_IRUGO | S_IWUSR, \
+        show_in, set_in, SYS_IN_MAX, ix); \
+static SENSOR_DEVICE_ATTR_2(in##ix##_alarm, S_IRUGO, \
+        show_in, NULL, SYS_IN_ALARM, ix)
+
+SENSOR_DEVICE_ATTR_IN(0);
+SENSOR_DEVICE_ATTR_IN(1);
+SENSOR_DEVICE_ATTR_IN(2);
+SENSOR_DEVICE_ATTR_IN(3);
+SENSOR_DEVICE_ATTR_IN(4);
+SENSOR_DEVICE_ATTR_IN(5);
+SENSOR_DEVICE_ATTR_IN(6);
+
+/* Temperatures 1-3 */
+
+#define SENSOR_DEVICE_ATTR_TEMP(ix) \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_input, S_IRUGO, \
+        show_temp, NULL, SYS_TEMP_INPUT, ix-1); \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_min, S_IRUGO | S_IWUSR, \
+        show_temp, set_temp, SYS_TEMP_MIN, ix-1); \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_max, S_IRUGO | S_IWUSR, \
+        show_temp, set_temp, SYS_TEMP_MAX, ix-1); \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_offset, S_IRUGO, \
+        show_temp, set_temp, SYS_TEMP_OFFSET, ix-1); \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_alarm, S_IRUGO, \
+        show_temp, NULL, SYS_TEMP_ALARM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(temp##ix##_fault, S_IRUGO, \
+        show_temp, NULL, SYS_TEMP_FAULT, ix-1)
+
+SENSOR_DEVICE_ATTR_TEMP(1);
+SENSOR_DEVICE_ATTR_TEMP(2);
+SENSOR_DEVICE_ATTR_TEMP(3);
+
+/* Zones 1-3 */
+
+#define SENSOR_DEVICE_ATTR_ZONE(ix) \
+static SENSOR_DEVICE_ATTR_2(zone##ix##_auto_channels_temp, S_IRUGO, \
+        show_zone, NULL, SYS_ZONE_AUTO_CHANNELS_TEMP, ix-1); \
+static SENSOR_DEVICE_ATTR_2(zone##ix##_auto_point1_temp_hyst, S_IRUGO, \
+        show_zone, set_zone, SYS_ZONE_AUTO_POINT1_TEMP_HYST, ix-1); \
+static SENSOR_DEVICE_ATTR_2(zone##ix##_auto_point1_temp, S_IRUGO, \
+        show_zone, set_zone, SYS_ZONE_AUTO_POINT1_TEMP, ix-1); \
+static SENSOR_DEVICE_ATTR_2(zone##ix##_auto_point2_temp, S_IRUGO, \
+        show_zone, set_zone, SYS_ZONE_AUTO_POINT2_TEMP, ix-1); \
+static SENSOR_DEVICE_ATTR_2(zone##ix##_auto_point3_temp, S_IRUGO, \
+        show_zone, set_zone, SYS_ZONE_AUTO_POINT3_TEMP, ix-1)
+
+SENSOR_DEVICE_ATTR_ZONE(1);
+SENSOR_DEVICE_ATTR_ZONE(2);
+SENSOR_DEVICE_ATTR_ZONE(3);
+
+/* Fans 1-4 */
+
+#define SENSOR_DEVICE_ATTR_FAN_1TO4(ix) \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_input, S_IRUGO, \
+        show_fan, NULL, SYS_FAN_INPUT, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_min, S_IRUGO | S_IWUSR, \
+        show_fan, set_fan, SYS_FAN_MIN, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_alarm, S_IRUGO, \
+        show_fan, NULL, SYS_FAN_ALARM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_type, S_IRUGO | S_IWUSR, \
+        show_fan, set_fan, SYS_FAN_TYPE, ix-1)
+
+SENSOR_DEVICE_ATTR_FAN_1TO4(1);
+SENSOR_DEVICE_ATTR_FAN_1TO4(2);
+SENSOR_DEVICE_ATTR_FAN_1TO4(3);
+SENSOR_DEVICE_ATTR_FAN_1TO4(4);
+
+/* Fans 5-6 */
+
+#define SENSOR_DEVICE_ATTR_FAN_5TO6(ix) \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_input, S_IRUGO, \
+        show_fan, NULL, SYS_FAN_INPUT, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_min, S_IRUGO | S_IWUSR, \
+        show_fan, set_fan, SYS_FAN_MIN, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_alarm, S_IRUGO, \
+        show_fan, NULL, SYS_FAN_ALARM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(fan##ix##_max, S_IRUGO | S_IWUSR, \
+        show_fan, set_fan, SYS_FAN_MAX, ix-1)
+
+SENSOR_DEVICE_ATTR_FAN_5TO6(5);
+SENSOR_DEVICE_ATTR_FAN_5TO6(6);
+
+/* PWMs 1-3 */
+
+#define SENSOR_DEVICE_ATTR_PWM_1TO3(ix) \
+static SENSOR_DEVICE_ATTR_2(pwm##ix, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_freq, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_FREQ, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_enable, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_ENABLE, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_ramp_rate, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_RAMP_RATE, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_auto_channels_zone, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_AUTO_CHANNELS_ZONE, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_auto_pwm_min, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_AUTO_PWM_MIN, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_auto_point1_pwm, S_IRUGO, \
+        show_pwm, set_pwm, SYS_PWM_AUTO_POINT1_PWM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_auto_point2_pwm, S_IRUGO, \
+        show_pwm, NULL, SYS_PWM_AUTO_POINT2_PWM, ix-1)
+
+SENSOR_DEVICE_ATTR_PWM_1TO3(1);
+SENSOR_DEVICE_ATTR_PWM_1TO3(2);
+SENSOR_DEVICE_ATTR_PWM_1TO3(3);
+
+/* PWMs 5-6 */
+
+#define SENSOR_DEVICE_ATTR_PWM_5TO6(ix) \
+static SENSOR_DEVICE_ATTR_2(pwm##ix, S_IRUGO | S_IWUSR, \
+        show_pwm, set_pwm, SYS_PWM, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_freq, S_IRUGO | S_IWUSR, \
+        show_pwm, set_pwm, SYS_PWM_FREQ, ix-1); \
+static SENSOR_DEVICE_ATTR_2(pwm##ix##_enable, S_IRUGO, \
+        show_pwm, NULL, SYS_PWM_ENABLE, ix-1)
+
+SENSOR_DEVICE_ATTR_PWM_5TO6(5);
+SENSOR_DEVICE_ATTR_PWM_5TO6(6);
+
+/* Misc */
+
+static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
+static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
+
+#define SENSOR_DEV_ATTR_IN(ix) \
+&sensor_dev_attr_in##ix##_input.dev_attr.attr, \
+&sensor_dev_attr_in##ix##_min.dev_attr.attr, \
+&sensor_dev_attr_in##ix##_max.dev_attr.attr, \
+&sensor_dev_attr_in##ix##_alarm.dev_attr.attr
+
+/* These attributes are read-writeable only if the chip is *not* locked */
+#define SENSOR_DEV_ATTR_TEMP_LOCK(ix) \
+&sensor_dev_attr_temp##ix##_offset.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_TEMP(ix) \
+SENSOR_DEV_ATTR_TEMP_LOCK(ix), \
+&sensor_dev_attr_temp##ix##_input.dev_attr.attr, \
+&sensor_dev_attr_temp##ix##_min.dev_attr.attr, \
+&sensor_dev_attr_temp##ix##_max.dev_attr.attr, \
+&sensor_dev_attr_temp##ix##_alarm.dev_attr.attr, \
+&sensor_dev_attr_temp##ix##_fault.dev_attr.attr
+
+/* These attributes are read-writeable only if the chip is *not* locked */
+#define SENSOR_DEV_ATTR_ZONE_LOCK(ix) \
+&sensor_dev_attr_zone##ix##_auto_point1_temp_hyst.dev_attr.attr, \
+&sensor_dev_attr_zone##ix##_auto_point1_temp.dev_attr.attr, \
+&sensor_dev_attr_zone##ix##_auto_point2_temp.dev_attr.attr, \
+&sensor_dev_attr_zone##ix##_auto_point3_temp.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_ZONE(ix) \
+SENSOR_DEV_ATTR_ZONE_LOCK(ix), \
+&sensor_dev_attr_zone##ix##_auto_channels_temp.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_FAN_1TO4(ix) \
+&sensor_dev_attr_fan##ix##_input.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_min.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_alarm.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_type.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_FAN_5TO6(ix) \
+&sensor_dev_attr_fan##ix##_input.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_min.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_alarm.dev_attr.attr, \
+&sensor_dev_attr_fan##ix##_max.dev_attr.attr
+
+/* These attributes are read-writeable only if the chip is *not* locked */
+#define SENSOR_DEV_ATTR_PWM_1TO3_LOCK(ix) \
+&sensor_dev_attr_pwm##ix##_freq.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_enable.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_ramp_rate.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_auto_channels_zone.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_auto_pwm_min.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_auto_point1_pwm.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_PWM_1TO3(ix) \
+SENSOR_DEV_ATTR_PWM_1TO3_LOCK(ix), \
+&sensor_dev_attr_pwm##ix.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_auto_point2_pwm.dev_attr.attr
+
+/* These attributes are read-writeable only if the chip is *not* locked */
+#define SENSOR_DEV_ATTR_PWM_5TO6_LOCK(ix) \
+&sensor_dev_attr_pwm##ix.dev_attr.attr, \
+&sensor_dev_attr_pwm##ix##_freq.dev_attr.attr
+
+#define SENSOR_DEV_ATTR_PWM_5TO6(ix) \
+SENSOR_DEV_ATTR_PWM_5TO6_LOCK(ix), \
+&sensor_dev_attr_pwm##ix##_enable.dev_attr.attr
+
+/* This struct holds all the attributes that are always present and need to be
+ * created unconditionally. The attributes that need modification of their
+ * permissions are created read-only and write permissions are added or removed
+ * on the fly when required */
+static struct attribute *dme1737_attr[] ={
+        /* Voltages */
+        SENSOR_DEV_ATTR_IN(0),
+        SENSOR_DEV_ATTR_IN(1),
+        SENSOR_DEV_ATTR_IN(2),
+        SENSOR_DEV_ATTR_IN(3),
+        SENSOR_DEV_ATTR_IN(4),
+        SENSOR_DEV_ATTR_IN(5),
+        SENSOR_DEV_ATTR_IN(6),
+        /* Temperatures */
+        SENSOR_DEV_ATTR_TEMP(1),
+        SENSOR_DEV_ATTR_TEMP(2),
+        SENSOR_DEV_ATTR_TEMP(3),
+        /* Zones */
+        SENSOR_DEV_ATTR_ZONE(1),
+        SENSOR_DEV_ATTR_ZONE(2),
+        SENSOR_DEV_ATTR_ZONE(3),
+        /* Misc */
+        &dev_attr_vrm.attr,
+        &dev_attr_cpu0_vid.attr,
+	NULL
+};
+
+static const struct attribute_group dme1737_group = {
+        .attrs = dme1737_attr,
+};
+
+/* The following structs hold the PWM attributes, some of which are optional.
+ * Their creation depends on the chip configuration which is determined during
+ * module load. */
+static struct attribute *dme1737_attr_pwm1[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3(1),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm2[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3(2),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm3[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3(3),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm5[] = {
+        SENSOR_DEV_ATTR_PWM_5TO6(5),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm6[] = {
+        SENSOR_DEV_ATTR_PWM_5TO6(6),
+	NULL
+};
+
+static const struct attribute_group dme1737_pwm_group[] = {
+	{ .attrs = dme1737_attr_pwm1 },
+	{ .attrs = dme1737_attr_pwm2 },
+	{ .attrs = dme1737_attr_pwm3 },
+	{ .attrs = NULL },
+	{ .attrs = dme1737_attr_pwm5 },
+	{ .attrs = dme1737_attr_pwm6 },
+};
+
+/* The following structs hold the fan attributes, some of which are optional.
+ * Their creation depends on the chip configuration which is determined during
+ * module load. */
+static struct attribute *dme1737_attr_fan1[] = {
+        SENSOR_DEV_ATTR_FAN_1TO4(1),
+	NULL
+};
+static struct attribute *dme1737_attr_fan2[] = {
+        SENSOR_DEV_ATTR_FAN_1TO4(2),
+	NULL
+};
+static struct attribute *dme1737_attr_fan3[] = {
+        SENSOR_DEV_ATTR_FAN_1TO4(3),
+	NULL
+};
+static struct attribute *dme1737_attr_fan4[] = {
+        SENSOR_DEV_ATTR_FAN_1TO4(4),
+	NULL
+};
+static struct attribute *dme1737_attr_fan5[] = {
+        SENSOR_DEV_ATTR_FAN_5TO6(5),
+	NULL
+};
+static struct attribute *dme1737_attr_fan6[] = {
+        SENSOR_DEV_ATTR_FAN_5TO6(6),
+	NULL
+};
+
+static const struct attribute_group dme1737_fan_group[] = {
+	{ .attrs = dme1737_attr_fan1 },
+	{ .attrs = dme1737_attr_fan2 },
+	{ .attrs = dme1737_attr_fan3 },
+	{ .attrs = dme1737_attr_fan4 },
+	{ .attrs = dme1737_attr_fan5 },
+	{ .attrs = dme1737_attr_fan6 },
+};
+
+/* The permissions of all of the following attributes are changed to read-
+ * writeable if the chip is *not* locked. Otherwise they stay read-only. */
+static struct attribute *dme1737_attr_lock[] = {
+	/* Temperatures */
+	SENSOR_DEV_ATTR_TEMP_LOCK(1),
+	SENSOR_DEV_ATTR_TEMP_LOCK(2),
+	SENSOR_DEV_ATTR_TEMP_LOCK(3),
+	/* Zones */
+	SENSOR_DEV_ATTR_ZONE_LOCK(1),
+	SENSOR_DEV_ATTR_ZONE_LOCK(2),
+	SENSOR_DEV_ATTR_ZONE_LOCK(3),
+	NULL
+};
+
+static const struct attribute_group dme1737_lock_group = {
+	.attrs = dme1737_attr_lock,
+};
+
+/* The permissions of the following PWM attributes are changed to read-
+ * writeable if the chip is *not* locked and the respective PWM is available.
+ * Otherwise they stay read-only. */
+static struct attribute *dme1737_attr_pwm1_lock[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3_LOCK(1),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm2_lock[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3_LOCK(2),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm3_lock[] = {
+        SENSOR_DEV_ATTR_PWM_1TO3_LOCK(3),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm5_lock[] = {
+        SENSOR_DEV_ATTR_PWM_5TO6_LOCK(5),
+	NULL
+};
+static struct attribute *dme1737_attr_pwm6_lock[] = {
+        SENSOR_DEV_ATTR_PWM_5TO6_LOCK(6),
+	NULL
+};
+
+static const struct attribute_group dme1737_pwm_lock_group[] = {
+	{ .attrs = dme1737_attr_pwm1_lock },
+	{ .attrs = dme1737_attr_pwm2_lock },
+	{ .attrs = dme1737_attr_pwm3_lock },
+	{ .attrs = NULL },
+	{ .attrs = dme1737_attr_pwm5_lock },
+	{ .attrs = dme1737_attr_pwm6_lock },
+};
+
+/* Pwm[1-3] are read-writeable if the associated pwm is in manual mode and the
+ * chip is not locked. Otherwise they are read-only. */
+static struct attribute *dme1737_attr_pwm[] = {
+	&sensor_dev_attr_pwm1.dev_attr.attr,
+	&sensor_dev_attr_pwm2.dev_attr.attr,
+	&sensor_dev_attr_pwm3.dev_attr.attr,
+};
+
+/* ---------------------------------------------------------------------
+ * Super-IO functions
+ * --------------------------------------------------------------------- */
+
+static inline int dme1737_sio_inb(int sio_cip, int reg)
+{
+	outb(reg, sio_cip);
+	return inb(sio_cip + 1);
+}
+
+static inline void dme1737_sio_outb(int sio_cip, int reg, int val)
+{
+	outb(reg, sio_cip);
+	outb(val, sio_cip + 1);
+}
+
+static int dme1737_sio_get_features(int sio_cip, struct i2c_client *client)
+{
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	int err = 0, reg;
+	u16 addr;
+
+	/* Enter configuration mode */
+	outb(0x55, sio_cip);
+
+	/* Check device ID
+	 * The DME1737 can return either 0x78 or 0x77 as its device ID. */
+	reg = dme1737_sio_inb(sio_cip, 0x20);
+	if (!(reg == 0x77 || reg == 0x78)) {
+		err = -ENODEV;
+		goto exit;
+	}
+
+	/* Select logical device A (runtime registers) */
+	dme1737_sio_outb(sio_cip, 0x07, 0x0a);
+
+	/* Get the base address of the runtime registers */
+	if (!(addr = (dme1737_sio_inb(sio_cip, 0x60) << 8) |
+		      dme1737_sio_inb(sio_cip, 0x61))) {
+		err = -ENODEV;
+		goto exit;
+	}
+
+	/* Read the runtime registers to determine which optional features
+	 * are enabled and available. Bits [3:2] of registers 0x43-0x46 are set
+	 * to '10' if the respective feature is enabled. */
+	if ((inb(addr + 0x43) & 0x0c) == 0x08) { /* fan6 */
+		data->has_fan |= (1 << 5);
+	}
+	if ((inb(addr + 0x44) & 0x0c) == 0x08) { /* pwm6 */
+		data->has_pwm |= (1 << 5);
+	}
+	if ((inb(addr + 0x45) & 0x0c) == 0x08) { /* fan5 */
+		data->has_fan |= (1 << 4);
+	}
+	if ((inb(addr + 0x46) & 0x0c) == 0x08) { /* pwm5 */
+		data->has_pwm |= (1 << 4);
+	}
+
+exit:
+	/* Exit configuration mode */
+	outb(0xaa, sio_cip);
+
+	return err;
+}
+
+/* ---------------------------------------------------------------------
+ * Device detection, registration and initialization
+ * --------------------------------------------------------------------- */
+
+static struct i2c_driver dme1737_driver;
+
+static void dme1737_chmod_file(struct i2c_client *client,
+			       struct attribute *attr, mode_t mode)
+{
+	if (sysfs_chmod_file(&client->dev.kobj, attr, mode)) {
+		dev_warn(&client->dev, "Failed to change permissions of %s.\n",
+			 attr->name);
+	}
+}
+
+static void dme1737_chmod_group(struct i2c_client *client,
+				const struct attribute_group *group,
+				mode_t mode)
+{
+	struct attribute **attr;
+
+	for (attr = group->attrs; *attr; attr++) {
+		dme1737_chmod_file(client, *attr, mode);
+	}
+}
+
+static int dme1737_init_client(struct i2c_client *client)
+{
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	int ix;
+	u8 reg;
+
+        data->config = dme1737_read(client, DME1737_REG_CONFIG);
+        /* Inform if part is not monitoring/started */
+        if (!(data->config & 0x01)) {
+                if (!force_start) {
+                        dev_err(&client->dev, "Device is not monitoring. "
+                                "Use the force_start load parameter to "
+                                "override.\n");
+                        return -EFAULT;
+                }
+
+                /* Force monitoring */
+                data->config |= 0x01;
+                dme1737_write(client, DME1737_REG_CONFIG, data->config);
+        }
+	/* Inform if part is not ready */
+	if (!(data->config & 0x04)) {
+		dev_err(&client->dev, "Device is not ready.\n");
+		return -EFAULT;
+	}
+
+	data->config2 = dme1737_read(client, DME1737_REG_CONFIG2);
+	/* Check if optional fan3 input is enabled */
+	if (data->config2 & 0x04) {
+		data->has_fan |= (1 << 2);
+	}
+
+	/* Fan4 and pwm3 are only available if the client's I2C address
+	 * is the default 0x2e. Otherwise the I/Os associated with these
+	 * functions are used for addr enable/select. */
+	if (client->addr == 0x2e) {
+		data->has_fan |= (1 << 3);
+		data->has_pwm |= (1 << 2);
+	}
+
+	/* Determine if the optional fan[5-6] and/or pwm[5-6] are enabled.
+	 * For this, we need to query the runtime registers through the
+	 * Super-IO LPC interface. Try both config ports 0x2e and 0x4e. */
+	if (dme1737_sio_get_features(0x2e, client) &&
+	    dme1737_sio_get_features(0x4e, client)) {
+		dev_warn(&client->dev, "Failed to query Super-IO for optional "
+			 "features.\n");
+	}
+
+	/* Fan1, fan2, pwm1, and pwm2 are always present */
+	data->has_fan |= 0x03;
+	data->has_pwm |= 0x03;
+
+	dev_info(&client->dev, "Optional features: pwm3=%s, pwm5=%s, pwm6=%s, "
+		 "fan3=%s, fan4=%s, fan5=%s, fan6=%s.\n",
+		 (data->has_pwm & (1 << 2)) ? "yes" : "no",
+		 (data->has_pwm & (1 << 4)) ? "yes" : "no",
+		 (data->has_pwm & (1 << 5)) ? "yes" : "no",
+		 (data->has_fan & (1 << 2)) ? "yes" : "no",
+		 (data->has_fan & (1 << 3)) ? "yes" : "no",
+		 (data->has_fan & (1 << 4)) ? "yes" : "no",
+		 (data->has_fan & (1 << 5)) ? "yes" : "no");
+
+	reg = dme1737_read(client, DME1737_REG_TACH_PWM);
+	/* Inform if fan-to-pwm mapping differs from the default */
+	if (reg != 0xa4) {
+		dev_warn(&client->dev, "Non-standard fan to pwm mapping: "
+			 "fan1->pwm%d, fan2->pwm%d, fan3->pwm%d, "
+			 "fan4->pwm%d. Please report to the driver "
+			 "maintainer.\n",
+			 (reg & 0x03) + 1, ((reg >> 2) & 0x03) + 1,
+			 ((reg >> 4) & 0x03) + 1, ((reg >> 6) & 0x03) + 1);
+	}
+
+	/* Switch pwm[1-3] to manual mode if they are currently disabled and
+	 * set the duty-cycles to 0% (which is identical to the PWMs being
+	 * disabled). */
+	if (!(data->config & 0x02)) {
+		for (ix = 0; ix < 3; ix++) {
+			data->pwm_config[ix] = dme1737_read(client,
+						DME1737_REG_PWM_CONFIG(ix));
+			if ((data->has_pwm & (1 << ix)) &&
+			    (PWM_EN_FROM_REG(data->pwm_config[ix]) == -1)) {
+				dev_info(&client->dev, "Switching pwm%d to "
+					 "manual mode.\n", ix + 1);
+				data->pwm_config[ix] = PWM_EN_TO_REG(1,
+							data->pwm_config[ix]);
+				dme1737_write(client, DME1737_REG_PWM(ix), 0);
+				dme1737_write(client,
+					      DME1737_REG_PWM_CONFIG(ix),
+					      data->pwm_config[ix]);
+			}
+		}
+	}
+
+	/* Initialize the default PWM auto channels zone (acz) assignments */
+	data->pwm_acz[0] = 1;	/* pwm1 -> zone1 */
+	data->pwm_acz[1] = 2;	/* pwm2 -> zone2 */
+	data->pwm_acz[2] = 4;	/* pwm3 -> zone3 */
+
+	/* Set VRM */
+	data->vrm = vid_which_vrm();
+
+	return 0;
+}
+
+static int dme1737_detect(struct i2c_adapter *adapter, int address,
+			  int kind)
+{
+	u8 company, verstep = 0;
+	struct i2c_client *client;
+	struct dme1737_data *data;
+	int ix, err = 0;
+	const char *name;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+		goto exit;
+	}
+
+	if (!(data = kzalloc(sizeof(struct dme1737_data), GFP_KERNEL))) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	client = &data->client;
+	i2c_set_clientdata(client, data);
+	client->addr = address;
+	client->adapter = adapter;
+	client->driver = &dme1737_driver;
+
+	/* A negative kind means that the driver was loaded with no force
+	 * parameter (default), so we must identify the chip. */
+	if (kind < 0) {
+		company = dme1737_read(client, DME1737_REG_COMPANY);
+		verstep = dme1737_read(client, DME1737_REG_VERSTEP);
+
+		if (!((company == DME1737_COMPANY_SMSC) &&
+		      ((verstep & DME1737_VERSTEP_MASK) == DME1737_VERSTEP))) {
+			err = -ENODEV;
+			goto exit_kfree;
+		}
+	}
+
+	kind = dme1737;
+	name = "dme1737";
+
+	/* Fill in the remaining client fields and put it into the global
+	 * list */
+	strlcpy(client->name, name, I2C_NAME_SIZE);
+	mutex_init(&data->update_lock);
+
+	/* Tell the I2C layer a new client has arrived */
+	if ((err = i2c_attach_client(client))) {
+		goto exit_kfree;
+	}
+
+	/* Initialize the DME1737 chip */
+	if ((err = dme1737_init_client(client))) {
+		goto exit_detach;
+	}
+
+	/* Create standard sysfs attributes */
+	if ((err = sysfs_create_group(&client->dev.kobj, &dme1737_group))) {
+                goto exit_detach;
+	}
+
+	/* Create fan sysfs attributes */
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
+		if (data->has_fan & (1 << ix)) {
+			if ((err = sysfs_create_group(&client->dev.kobj,
+						&dme1737_fan_group[ix]))) {
+				goto exit_remove;
+			}
+		}
+	}
+
+	/* Create PWM sysfs attributes */
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_group); ix++) {
+		if (data->has_pwm & (1 << ix)) {
+			if ((err = sysfs_create_group(&client->dev.kobj,
+						&dme1737_pwm_group[ix]))) {
+				goto exit_remove;
+			}
+		}
+	}
+
+	/* Inform if the device is locked. Otherwise change the permissions of
+	 * selected attributes from read-only to read-writeable. */
+	if (data->config & 0x02) {
+		dev_info(&client->dev, "Device is locked. Some attributes "
+			 "will be read-only.\n");
+	} else {
+		/* Change permissions of standard attributes */
+		dme1737_chmod_group(client, &dme1737_lock_group,
+				    S_IRUGO | S_IWUSR);
+
+		/* Change permissions of PWM attributes */
+		for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_lock_group); ix++) {
+			if (data->has_pwm & (1 << ix)) {
+				dme1737_chmod_group(client,
+						&dme1737_pwm_lock_group[ix],
+						S_IRUGO | S_IWUSR);
+			}
+		}
+
+		/* Change permissions of pwm[1-3] if in manual mode */
+		for (ix = 0; ix < 3; ix++) {
+			if ((data->has_pwm & (1 << ix)) &&
+			    (PWM_EN_FROM_REG(data->pwm_config[ix]) == 1)) {
+				dme1737_chmod_file(client,
+						   dme1737_attr_pwm[ix],
+						   S_IRUGO | S_IWUSR);
+			}
+		}
+	}
+
+	/* Register device */
+	data->class_dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->class_dev)) {
+		err = PTR_ERR(data->class_dev);
+		goto exit_remove;
+	}
+
+	dev_info(&adapter->dev, "Found a DME1737 chip at 0x%02x "
+		 "(rev 0x%02x)\n", client->addr, verstep);
+
+	return 0;
+
+exit_remove:
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
+		if (data->has_fan & (1 << ix)) {
+			sysfs_remove_group(&client->dev.kobj,
+					   &dme1737_fan_group[ix]);
+		}
+	}
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_group); ix++) {
+		if (data->has_pwm & (1 << ix)) {
+			sysfs_remove_group(&client->dev.kobj,
+					   &dme1737_pwm_group[ix]);
+		}
+	}
+	sysfs_remove_group(&client->dev.kobj, &dme1737_group);
+exit_detach:
+	i2c_detach_client(client);
+exit_kfree:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int dme1737_attach_adapter(struct i2c_adapter *adapter)
+{
+	if (!(adapter->class & I2C_CLASS_HWMON)) {
+		return 0;
+	}
+
+	return i2c_probe(adapter, &addr_data, dme1737_detect);
+}
+
+static int dme1737_detach_client(struct i2c_client *client)
+{
+	struct dme1737_data *data = i2c_get_clientdata(client);
+	int ix, err;
+
+	hwmon_device_unregister(data->class_dev);
+
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_fan_group); ix++) {
+		if (data->has_fan & (1 << ix)) {
+			sysfs_remove_group(&client->dev.kobj,
+					   &dme1737_fan_group[ix]);
+		}
+	}
+	for (ix = 0; ix < ARRAY_SIZE(dme1737_pwm_group); ix++) {
+		if (data->has_pwm & (1 << ix)) {
+			sysfs_remove_group(&client->dev.kobj,
+					   &dme1737_pwm_group[ix]);
+		}
+	}
+	sysfs_remove_group(&client->dev.kobj, &dme1737_group);
+
+	if ((err = i2c_detach_client(client))) {
+		return err;
+	}
+
+	kfree(data);
+	return 0;
+}
+
+static struct i2c_driver dme1737_driver = {
+	.driver = {
+		.name = "dme1737",
+	},
+	.attach_adapter	= dme1737_attach_adapter,
+	.detach_client = dme1737_detach_client,
+};
+
+static int __init dme1737_init(void)
+{
+	return i2c_add_driver(&dme1737_driver);
+}
+
+static void __exit dme1737_exit(void)
+{
+	i2c_del_driver(&dme1737_driver);
+}
+
+MODULE_AUTHOR("Juerg Haefliger <juergh@gmail.com>");
+MODULE_DESCRIPTION("DME1737 sensors");
+MODULE_LICENSE("GPL");
+
+module_init(dme1737_init);
+module_exit(dme1737_exit);