4 files changed, 47 insertions, 166 deletions

diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index fa8776ab9b18..84d46c0c71a3 100644
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -35,13 +35,6 @@ the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 All Sysfs entries are named with their core_id (represented here by 'X').
 tempX_input      - Core temperature (in millidegrees Celsius).
 tempX_max        - All cooling devices should be turned on (on Core2).
-                   Initialized with IA32_THERM_INTERRUPT. When the CPU
-                   temperature reaches this temperature, an interrupt is
-                   generated and tempX_max_alarm is set.
-tempX_max_hyst   - If the CPU temperature falls below than temperature,
-                   an interrupt is generated and tempX_max_alarm is reset.
-tempX_max_alarm  - Set if the temperature reaches or exceeds tempX_max.
-                   Reset if the temperature drops to or below tempX_max_hyst.
 tempX_crit       - Maximum junction temperature (in millidegrees Celsius).
 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
                    Correct CPU operation is no longer guaranteed.
@@ -49,9 +42,10 @@ tempX_label	 - Contains string "Core X", where X is processor
                    number. For Package temp, this will be "Physical id Y",
                    where Y is the package number.
 
-The TjMax temperature is set to 85 degrees C if undocumented model specific
-register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as
-(sometimes) documented in processor datasheet.
+On CPU models which support it, TjMax is read from a model-specific register.
+On other models, it is set to an arbitrary value based on weak heuristics.
+If these heuristics don't work for you, you can pass the correct TjMax value
+as a module parameter (tjmax).
 
 Appendix A. Known TjMax lists (TBD):
 Some information comes from ark.intel.com
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 411257676133..44b23917d4cc 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -36,17 +36,25 @@
 #include <linux/cpu.h>
 #include <linux/pci.h>
 #include <linux/smp.h>
+#include <linux/moduleparam.h>
 #include <asm/msr.h>
 #include <asm/processor.h>
 
 #define DRVNAME "coretemp"
 
+/*
+ * force_tjmax only matters when TjMax can't be read from the CPU itself.
+ * When set, it replaces the driver's suboptimal heuristic.
+ */
+static int force_tjmax;
+module_param_named(tjmax, force_tjmax, int, 0444);
+MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
+
 #define BASE_SYSFS_ATTR_NO      2       /* Sysfs Base attr no for coretemp */
 #define NUM_REAL_CORES          16      /* Number of Real cores per cpu */
 #define CORETEMP_NAME_LENGTH    17      /* String Length of attrs */
 #define MAX_CORE_ATTRS          4       /* Maximum no of basic attrs */
-#define MAX_THRESH_ATTRS        3       /* Maximum no of Threshold attrs */
-#define TOTAL_ATTRS             (MAX_CORE_ATTRS + MAX_THRESH_ATTRS)
+#define TOTAL_ATTRS             (MAX_CORE_ATTRS + 1)
 #define MAX_CORE_DATA           (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
 
 #ifdef CONFIG_SMP
@@ -69,8 +77,6 @@
  *              This value is passed as "id" field to rdmsr/wrmsr functions.
  * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
  *              from where the temperature values should be read.
- * @intrpt_reg: One of IA32_THERM_INTERRUPT or IA32_PACKAGE_THERM_INTERRUPT,
- *              from where the thresholds are read.
  * @attr_size:  Total number of pre-core attrs displayed in the sysfs.
  * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
  *              Otherwise, temp_data holds coretemp data.
@@ -79,13 +85,11 @@
 struct temp_data {
         int temp;
         int ttarget;
-        int tmin;
         int tjmax;
         unsigned long last_updated;
         unsigned int cpu;
         u32 cpu_core_id;
         u32 status_reg;
-        u32 intrpt_reg;
         int attr_size;
         bool is_pkg_data;
         bool valid;
@@ -143,19 +147,6 @@ static ssize_t show_crit_alarm(struct device *dev,
         return sprintf(buf, "%d\n", (eax >> 5) & 1);
 }
 
-static ssize_t show_max_alarm(struct device *dev,
-                                struct device_attribute *devattr, char *buf)
-{
-        u32 eax, edx;
-        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-        struct platform_data *pdata = dev_get_drvdata(dev);
-        struct temp_data *tdata = pdata->core_data[attr->index];
-
-        rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
-
-        return sprintf(buf, "%d\n", !!(eax & THERM_STATUS_THRESHOLD1));
-}
-
 static ssize_t show_tjmax(struct device *dev,
                         struct device_attribute *devattr, char *buf)
 {
@@ -174,83 +165,6 @@ static ssize_t show_ttarget(struct device *dev,
         return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
 }
 
-static ssize_t store_ttarget(struct device *dev,
-                                struct device_attribute *devattr,
-                                const char *buf, size_t count)
-{
-        struct platform_data *pdata = dev_get_drvdata(dev);
-        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-        struct temp_data *tdata = pdata->core_data[attr->index];
-        u32 eax, edx;
-        unsigned long val;
-        int diff;
-
-        if (strict_strtoul(buf, 10, &val))
-                return -EINVAL;
-
-        /*
-         * THERM_MASK_THRESHOLD1 is 7 bits wide. Values are entered in terms
-         * of milli degree celsius. Hence don't accept val > (127 * 1000)
-         */
-        if (val > tdata->tjmax || val > 127000)
-                return -EINVAL;
-
-        diff = (tdata->tjmax - val) / 1000;
-
-        mutex_lock(&tdata->update_lock);
-        rdmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, &eax, &edx);
-        eax = (eax & ~THERM_MASK_THRESHOLD1) |
-                                (diff << THERM_SHIFT_THRESHOLD1);
-        wrmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, eax, edx);
-        tdata->ttarget = val;
-        mutex_unlock(&tdata->update_lock);
-
-        return count;
-}
-
-static ssize_t show_tmin(struct device *dev,
-                        struct device_attribute *devattr, char *buf)
-{
-        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-        struct platform_data *pdata = dev_get_drvdata(dev);
-
-        return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tmin);
-}
-
-static ssize_t store_tmin(struct device *dev,
-                                struct device_attribute *devattr,
-                                const char *buf, size_t count)
-{
-        struct platform_data *pdata = dev_get_drvdata(dev);
-        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
-        struct temp_data *tdata = pdata->core_data[attr->index];
-        u32 eax, edx;
-        unsigned long val;
-        int diff;
-
-        if (strict_strtoul(buf, 10, &val))
-                return -EINVAL;
-
-        /*
-         * THERM_MASK_THRESHOLD0 is 7 bits wide. Values are entered in terms
-         * of milli degree celsius. Hence don't accept val > (127 * 1000)
-         */
-        if (val > tdata->tjmax || val > 127000)
-                return -EINVAL;
-
-        diff = (tdata->tjmax - val) / 1000;
-
-        mutex_lock(&tdata->update_lock);
-        rdmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, &eax, &edx);
-        eax = (eax & ~THERM_MASK_THRESHOLD0) |
-                                (diff << THERM_SHIFT_THRESHOLD0);
-        wrmsr_on_cpu(tdata->cpu, tdata->intrpt_reg, eax, edx);
-        tdata->tmin = val;
-        mutex_unlock(&tdata->update_lock);
-
-        return count;
-}
-
 static ssize_t show_temp(struct device *dev,
                         struct device_attribute *devattr, char *buf)
 {
@@ -374,7 +288,6 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 
 static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 {
-        /* The 100C is default for both mobile and non mobile CPUs */
         int err;
         u32 eax, edx;
         u32 val;
@@ -385,7 +298,8 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
          */
         err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
         if (err) {
-                dev_warn(dev, "Unable to read TjMax from CPU.\n");
+                if (c->x86_model > 0xe && c->x86_model != 0x1c)
+                        dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
         } else {
                 val = (eax >> 16) & 0xff;
                 /*
@@ -393,11 +307,17 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
                  * will be used
                  */
                 if (val) {
-                        dev_info(dev, "TjMax is %d C.\n", val);
+                        dev_dbg(dev, "TjMax is %d degrees C\n", val);
                         return val * 1000;
                 }
         }
 
+        if (force_tjmax) {
+                dev_notice(dev, "TjMax forced to %d degrees C by user\n",
+                           force_tjmax);
+                return force_tjmax * 1000;
+        }
+
         /*
          * An assumption is made for early CPUs and unreadable MSR.
          * NOTE: the calculated value may not be correct.
@@ -414,21 +334,6 @@ static void __devinit get_ucode_rev_on_cpu(void *edx)
         rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx);
 }
 
-static int get_pkg_tjmax(unsigned int cpu, struct device *dev)
-{
-        int err;
-        u32 eax, edx, val;
-
-        err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
-        if (!err) {
-                val = (eax >> 16) & 0xff;
-                if (val)
-                        return val * 1000;
-        }
-        dev_warn(dev, "Unable to read Pkg-TjMax from CPU:%u\n", cpu);
-        return 100000; /* Default TjMax: 100 degree celsius */
-}
-
 static int create_name_attr(struct platform_data *pdata, struct device *dev)
 {
         sysfs_attr_init(&pdata->name_attr.attr);
@@ -442,19 +347,14 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
                                 int attr_no)
 {
         int err, i;
-        static ssize_t (*rd_ptr[TOTAL_ATTRS]) (struct device *dev,
+        static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
                         struct device_attribute *devattr, char *buf) = {
                         show_label, show_crit_alarm, show_temp, show_tjmax,
-                        show_max_alarm, show_ttarget, show_tmin };
-        static ssize_t (*rw_ptr[TOTAL_ATTRS]) (struct device *dev,
-                        struct device_attribute *devattr, const char *buf,
-                        size_t count) = { NULL, NULL, NULL, NULL, NULL,
-                                        store_ttarget, store_tmin };
-        static const char *names[TOTAL_ATTRS] = {
+                        show_ttarget };
+        static const char *const names[TOTAL_ATTRS] = {
                                         "temp%d_label", "temp%d_crit_alarm",
                                         "temp%d_input", "temp%d_crit",
-                                        "temp%d_max_alarm", "temp%d_max",
-                                        "temp%d_max_hyst" };
+                                        "temp%d_max" };
 
         for (i = 0; i < tdata->attr_size; i++) {
                 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i],
@@ -462,10 +362,6 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
                 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
                 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
                 tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
-                if (rw_ptr[i]) {
-                        tdata->sd_attrs[i].dev_attr.attr.mode |= S_IWUSR;
-                        tdata->sd_attrs[i].dev_attr.store = rw_ptr[i];
-                }
                 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
                 tdata->sd_attrs[i].index = attr_no;
                 err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr);
@@ -538,8 +434,6 @@ static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
 
         tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
                                                         MSR_IA32_THERM_STATUS;
-        tdata->intrpt_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_INTERRUPT :
-                                                MSR_IA32_THERM_INTERRUPT;
         tdata->is_pkg_data = pkg_flag;
         tdata->cpu = cpu;
         tdata->cpu_core_id = TO_CORE_ID(cpu);
@@ -548,11 +442,11 @@ static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
         return tdata;
 }
 
-static int create_core_data(struct platform_data *pdata,
-                                struct platform_device *pdev,
+static int create_core_data(struct platform_device *pdev,
                                 unsigned int cpu, int pkg_flag)
 {
         struct temp_data *tdata;
+        struct platform_data *pdata = platform_get_drvdata(pdev);
         struct cpuinfo_x86 *c = &cpu_data(cpu);
         u32 eax, edx;
         int err, attr_no;
@@ -588,25 +482,21 @@ static int create_core_data(struct platform_data *pdata,
                 goto exit_free;
 
         /* We can access status register. Get Critical Temperature */
-        if (pkg_flag)
-                tdata->tjmax = get_pkg_tjmax(pdev->id, &pdev->dev);
-        else
-                tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
+        tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
 
         /*
-         * Test if we can access the intrpt register. If so, increase the
-         * 'size' enough to have ttarget/tmin/max_alarm interfaces.
-         * Initialize ttarget with bits 16:22 of MSR_IA32_THERM_INTERRUPT
+         * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
+         * The target temperature is available on older CPUs but not in this
+         * register. Atoms don't have the register at all.
          */
-        err = rdmsr_safe_on_cpu(cpu, tdata->intrpt_reg, &eax, &edx);
-        if (!err) {
-                tdata->attr_size += MAX_THRESH_ATTRS;
-                tdata->tmin = tdata->tjmax -
-                              ((eax & THERM_MASK_THRESHOLD0) >>
-                               THERM_SHIFT_THRESHOLD0) * 1000;
-                tdata->ttarget = tdata->tjmax -
-                                 ((eax & THERM_MASK_THRESHOLD1) >>
-                                  THERM_SHIFT_THRESHOLD1) * 1000;
+        if (c->x86_model > 0xe && c->x86_model != 0x1c) {
+                err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
+                                        &eax, &edx);
+                if (!err) {
+                        tdata->ttarget
+                          = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
+                        tdata->attr_size++;
+                }
         }
 
         pdata->core_data[attr_no] = tdata;
@@ -624,16 +514,13 @@ exit_free:
 
 static void coretemp_add_core(unsigned int cpu, int pkg_flag)
 {
-        struct platform_data *pdata;
         struct platform_device *pdev = coretemp_get_pdev(cpu);
         int err;
 
         if (!pdev)
                 return;
 
-        pdata = platform_get_drvdata(pdev);
-
-        err = create_core_data(pdata, pdev, cpu, pkg_flag);
+        err = create_core_data(pdev, cpu, pkg_flag);
         if (err)
                 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
 }
@@ -671,7 +558,7 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
         if (err)
                 goto exit_free;
 
-        pdata->phys_proc_id = TO_PHYS_ID(pdev->id);
+        pdata->phys_proc_id = pdev->id;
         platform_set_drvdata(pdev, pdata);
 
         pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
@@ -723,7 +610,7 @@ static int __cpuinit coretemp_device_add(unsigned int cpu)
 
         mutex_lock(&pdev_list_mutex);
 
-        pdev = platform_device_alloc(DRVNAME, cpu);
+        pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu));
         if (!pdev) {
                 err = -ENOMEM;
                 pr_err("Device allocation failed\n");
diff --git a/drivers/hwmon/ds620.c b/drivers/hwmon/ds620.c
index 257957c69d92..4f7c3fc40a89 100644
--- a/drivers/hwmon/ds620.c
+++ b/drivers/hwmon/ds620.c
@@ -72,7 +72,7 @@ struct ds620_data {
         char valid;             /* !=0 if following fields are valid */
         unsigned long last_updated;     /* In jiffies */
 
-        u16 temp[3];            /* Register values, word */
+        s16 temp[3];            /* Register values, word */
 };
 
 /*
diff --git a/drivers/hwmon/w83791d.c b/drivers/hwmon/w83791d.c
index 17cf1ab95521..8c2844e5691c 100644
--- a/drivers/hwmon/w83791d.c
+++ b/drivers/hwmon/w83791d.c
@@ -329,8 +329,8 @@ static int w83791d_detect(struct i2c_client *client,
                           struct i2c_board_info *info);
 static int w83791d_remove(struct i2c_client *client);
 
-static int w83791d_read(struct i2c_client *client, u8 register);
-static int w83791d_write(struct i2c_client *client, u8 register, u8 value);
+static int w83791d_read(struct i2c_client *client, u8 reg);
+static int w83791d_write(struct i2c_client *client, u8 reg, u8 value);
 static struct w83791d_data *w83791d_update_device(struct device *dev);
 
 #ifdef DEBUG