hwmon: (lm85) Add support for ADT7468 high-frequency PWM mode

The ADT7468 supports a high-frequency PWM output mode where all PWM
outputs are driven by a 22.5 kHz clock. Add support for this mode, and
document it, as it may surprise the user that setting one PWM output
frequency also affects the other PWM outputs.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>

2 files changed, 35 insertions, 7 deletions

diff --git a/Documentation/hwmon/lm85 b/Documentation/hwmon/lm85
index 83cd5bb1ac7..239258a63c8 100644
--- a/Documentation/hwmon/lm85
+++ b/Documentation/hwmon/lm85
@@ -101,6 +101,13 @@ Devices has confirmed this "bug". The ADT7463 is reported to work as
 described in the documentation. The current lm85 driver does not show the
 offset register.
 
+The ADT7468 has a high-frequency PWM mode, where all PWM outputs are
+driven by a 22.5 kHz clock. This is a global mode, not per-PWM output,
+which means that setting any PWM frequency above 11.3 kHz will switch
+all 3 PWM outputs to a 22.5 kHz frequency. Conversely, setting any PWM
+frequency below 11.3 kHz will switch all 3 PWM outputs to a frequency
+between 10 and 100 Hz, which can then be tuned separately.
+
 See the vendor datasheets for more information. There is application note
 from National (AN-1260) with some additional information about the LM85.
 The Analog Devices datasheet is very detailed and describes a procedure for
diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 2e8f0c9458d..1e229847f37 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -64,9 +64,12 @@ enum chips {
 #define LM85_REG_VERSTEP                0x3f
 
 #define ADT7468_REG_CFG5                0x7c
-#define         ADT7468_OFF64           0x01
+#define         ADT7468_OFF64           (1 << 0)
+#define         ADT7468_HFPWM           (1 << 1)
 #define IS_ADT7468_OFF64(data)          \
         ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_OFF64))
+#define IS_ADT7468_HFPWM(data)          \
+        ((data)->type == adt7468 && !((data)->cfg5 & ADT7468_HFPWM))
 
 /* These are the recognized values for the above regs */
 #define LM85_COMPANY_NATIONAL           0x01
@@ -567,8 +570,14 @@ static ssize_t show_pwm_freq(struct device *dev,
 {
         int nr = to_sensor_dev_attr(attr)->index;
         struct lm85_data *data = lm85_update_device(dev);
-        return sprintf(buf, "%d\n", FREQ_FROM_REG(data->freq_map,
-                                                  data->pwm_freq[nr]));
+        int freq;
+
+        if (IS_ADT7468_HFPWM(data))
+                freq = 22500;
+        else
+                freq = FREQ_FROM_REG(data->freq_map, data->pwm_freq[nr]);
+
+        return sprintf(buf, "%d\n", freq);
 }
 
 static ssize_t set_pwm_freq(struct device *dev,
@@ -580,10 +589,22 @@ static ssize_t set_pwm_freq(struct device *dev,
         long val = simple_strtol(buf, NULL, 10);
 
         mutex_lock(&data->update_lock);
-        data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map, val);
-        lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
-                (data->zone[nr].range << 4)
-                | data->pwm_freq[nr]);
+        /* The ADT7468 has a special high-frequency PWM output mode,
+         * where all PWM outputs are driven by a 22.5 kHz clock.
+         * This might confuse the user, but there's not much we can do. */
+        if (data->type == adt7468 && val >= 11300) {    /* High freq. mode */
+                data->cfg5 &= ~ADT7468_HFPWM;
+                lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5);
+        } else {                                        /* Low freq. mode */
+                data->pwm_freq[nr] = FREQ_TO_REG(data->freq_map, val);
+                lm85_write_value(client, LM85_REG_AFAN_RANGE(nr),
+                                 (data->zone[nr].range << 4)
+                                 | data->pwm_freq[nr]);
+                if (data->type == adt7468) {
+                        data->cfg5 |= ADT7468_HFPWM;
+                        lm85_write_value(client, ADT7468_REG_CFG5, data->cfg5);
+                }
+        }
         mutex_unlock(&data->update_lock);
         return count;
 }