ACPI: thinkpad-acpi: cleanup thermal subdriver for sysfs conversion

Clean-up the thermal subdriver for sysfs conversion.  Make thermal_get_*
reentrancy-safe while at it, and add the missing thermal_read_mode variable
to the header file.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 61 insertions, 26 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 8829d3c6b444..e9aec87a9f09 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -1818,13 +1818,13 @@ static int __init thermal_init(struct ibm_init_struct *iibm)
 
                 ta1 = ta2 = 0;
                 for (i = 0; i < 8; i++) {
-                        if (likely(acpi_ec_read(0x78 + i, &t))) {
+                        if (acpi_ec_read(TP_EC_THERMAL_TMP0 + i, &t)) {
                                 ta1 |= t;
                         } else {
                                 ta1 = 0;
                                 break;
                         }
-                        if (likely(acpi_ec_read(0xC0 + i, &t))) {
+                        if (acpi_ec_read(TP_EC_THERMAL_TMP8 + i, &t)) {
                                 ta2 |= t;
                         } else {
                                 ta1 = 0;
@@ -1869,57 +1869,84 @@ static int __init thermal_init(struct ibm_init_struct *iibm)
         return (thermal_read_mode != TPACPI_THERMAL_NONE)? 0 : 1;
 }
 
-static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)
+/* idx is zero-based */
+static int thermal_get_sensor(int idx, s32 *value)
 {
-        int i, t;
+        int t;
         s8 tmp;
-        char tmpi[] = "TMPi";
+        char tmpi[5];
 
-        if (!s)
-                return -EINVAL;
+        t = TP_EC_THERMAL_TMP0;
 
         switch (thermal_read_mode) {
 #if TPACPI_MAX_THERMAL_SENSORS >= 16
         case TPACPI_THERMAL_TPEC_16:
-                for (i = 0; i < 8; i++) {
-                        if (!acpi_ec_read(0xC0 + i, &tmp))
-                                return -EIO;
-                        s->temp[i + 8] = tmp * 1000;
+                if (idx >= 8 && idx <= 15) {
+                        t = TP_EC_THERMAL_TMP8;
+                        idx -= 8;
                 }
                 /* fallthrough */
 #endif
         case TPACPI_THERMAL_TPEC_8:
-                for (i = 0; i < 8; i++) {
-                        if (!acpi_ec_read(0x78 + i, &tmp))
+                if (idx <= 7) {
+                        if (!acpi_ec_read(t + idx, &tmp))
                                 return -EIO;
-                        s->temp[i] = tmp * 1000;
+                        *value = tmp * 1000;
+                        return 0;
                 }
-                return (thermal_read_mode == TPACPI_THERMAL_TPEC_16) ? 16 : 8;
+                break;
 
         case TPACPI_THERMAL_ACPI_UPDT:
-                if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
-                        return -EIO;
-                for (i = 0; i < 8; i++) {
-                        tmpi[3] = '0' + i;
+                if (idx <= 7) {
+                        snprintf(tmpi, sizeof(tmpi), "TMP%c", '0' + idx);
+                        if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))
+                                return -EIO;
                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
                                 return -EIO;
-                        s->temp[i] = (t - 2732) * 100;
+                        *value = (t - 2732) * 100;
+                        return 0;
                 }
-                return 8;
+                break;
 
         case TPACPI_THERMAL_ACPI_TMP07:
-                for (i = 0; i < 8; i++) {
-                        tmpi[3] = '0' + i;
+                if (idx <= 7) {
+                        snprintf(tmpi, sizeof(tmpi), "TMP%c", '0' + idx);
                         if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
                                 return -EIO;
-                        s->temp[i] = t * 1000;
+                        *value = t * 1000;
+                        return 0;
                 }
-                return 8;
+                break;
 
         case TPACPI_THERMAL_NONE:
         default:
-                return 0;
+                return -ENOSYS;
         }
+
+        return -EINVAL;
+}
+
+static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)
+{
+        int res, i;
+        int n;
+
+        n = 8;
+        i = 0;
+
+        if (!s)
+                return -EINVAL;
+
+        if (thermal_read_mode == TPACPI_THERMAL_TPEC_16)
+                n = 16;
+
+        for(i = 0 ; i < n; i++) {
+                res = thermal_get_sensor(i, &s->temp[i]);
+                if (res)
+                        return res;
+        }
+
+        return n;
 }
 
 static int thermal_read(char *p)
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index fb0abb02a016..6432b28339af 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -427,12 +427,20 @@ enum thermal_access_mode {
         TPACPI_THERMAL_TPEC_16,         /* Use ACPI EC regs, 16 sensors */
 };
 
+enum { /* TPACPI_THERMAL_TPEC_* */
+        TP_EC_THERMAL_TMP0 = 0x78,      /* ACPI EC regs TMP 0..7 */
+        TP_EC_THERMAL_TMP8 = 0xC0,      /* ACPI EC regs TMP 8..15 */
+};
+
 #define TPACPI_MAX_THERMAL_SENSORS 16   /* Max thermal sensors supported */
 struct ibm_thermal_sensors_struct {
         s32 temp[TPACPI_MAX_THERMAL_SENSORS];
 };
 
+static enum thermal_access_mode thermal_read_mode;
+
 static int thermal_init(struct ibm_init_struct *iibm);
+static int thermal_get_sensor(int idx, s32 *value);
 static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s);
 static int thermal_read(char *p);