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authorJean Delvare <khali@linux-fr.org>2006-12-12 12:18:27 -0500
committerJean Delvare <khali@arrakis.delvare>2006-12-12 12:18:27 -0500
commit6e2bc17b0793297b38aef1bba39f2cb634d66208 (patch)
treea0e1f9391c3347072bbd4eb1ba05fafc1e3b6031 /drivers/hwmon/f71805f.c
parent95e353127dfcd86df56a742a96ccf56369929b95 (diff)
hwmon/f71805f: Let the user adjust the PWM base frequency
Different frequencies can give better results depending on the exact fan model used. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon/f71805f.c')
-rw-r--r--drivers/hwmon/f71805f.c63
1 files changed, 62 insertions, 1 deletions
diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c
index 6e6542036c6a..173e2d2cb49c 100644
--- a/drivers/hwmon/f71805f.c
+++ b/drivers/hwmon/f71805f.c
@@ -112,6 +112,7 @@ superio_exit(int base)
112#define F71805F_REG_FAN(nr) (0x20 + 2 * (nr)) 112#define F71805F_REG_FAN(nr) (0x20 + 2 * (nr))
113#define F71805F_REG_FAN_LOW(nr) (0x28 + 2 * (nr)) 113#define F71805F_REG_FAN_LOW(nr) (0x28 + 2 * (nr))
114#define F71805F_REG_FAN_CTRL(nr) (0x60 + 16 * (nr)) 114#define F71805F_REG_FAN_CTRL(nr) (0x60 + 16 * (nr))
115#define F71805F_REG_PWM_FREQ(nr) (0x63 + 16 * (nr))
115#define F71805F_REG_PWM_DUTY(nr) (0x6B + 16 * (nr)) 116#define F71805F_REG_PWM_DUTY(nr) (0x6B + 16 * (nr))
116/* temp nr from 0 to 2 (8-bit values) */ 117/* temp nr from 0 to 2 (8-bit values) */
117#define F71805F_REG_TEMP(nr) (0x1B + (nr)) 118#define F71805F_REG_TEMP(nr) (0x1B + (nr))
@@ -153,6 +154,7 @@ struct f71805f_data {
153 u16 fan_low[3]; 154 u16 fan_low[3];
154 u8 fan_ctrl[3]; 155 u8 fan_ctrl[3];
155 u8 pwm[3]; 156 u8 pwm[3];
157 u8 pwm_freq[3];
156 u8 temp[3]; 158 u8 temp[3];
157 u8 temp_high[3]; 159 u8 temp_high[3];
158 u8 temp_hyst[3]; 160 u8 temp_hyst[3];
@@ -209,6 +211,28 @@ static inline u16 fan_to_reg(long rpm)
209 return (1500000 / rpm); 211 return (1500000 / rpm);
210} 212}
211 213
214static inline unsigned long pwm_freq_from_reg(u8 reg)
215{
216 unsigned long clock = (reg & 0x80) ? 48000000UL : 1000000UL;
217
218 reg &= 0x7f;
219 if (reg == 0)
220 reg++;
221 return clock / (reg << 8);
222}
223
224static inline u8 pwm_freq_to_reg(unsigned long val)
225{
226 if (val >= 187500) /* The highest we can do */
227 return 0x80;
228 if (val >= 1475) /* Use 48 MHz clock */
229 return 0x80 | (48000000UL / (val << 8));
230 if (val < 31) /* The lowest we can do */
231 return 0x7f;
232 else /* Use 1 MHz clock */
233 return 1000000UL / (val << 8);
234}
235
212static inline long temp_from_reg(u8 reg) 236static inline long temp_from_reg(u8 reg)
213{ 237{
214 return (reg * 1000); 238 return (reg * 1000);
@@ -294,6 +318,8 @@ static struct f71805f_data *f71805f_update_device(struct device *dev)
294 continue; 318 continue;
295 data->fan_low[nr] = f71805f_read16(data, 319 data->fan_low[nr] = f71805f_read16(data,
296 F71805F_REG_FAN_LOW(nr)); 320 F71805F_REG_FAN_LOW(nr));
321 data->pwm_freq[nr] = f71805f_read8(data,
322 F71805F_REG_PWM_FREQ(nr));
297 } 323 }
298 for (nr = 0; nr < 3; nr++) { 324 for (nr = 0; nr < 3; nr++) {
299 data->temp_high[nr] = f71805f_read8(data, 325 data->temp_high[nr] = f71805f_read8(data,
@@ -526,6 +552,16 @@ static ssize_t show_pwm_enable(struct device *dev, struct device_attribute
526 return sprintf(buf, "%d\n", mode); 552 return sprintf(buf, "%d\n", mode);
527} 553}
528 554
555static ssize_t show_pwm_freq(struct device *dev, struct device_attribute
556 *devattr, char *buf)
557{
558 struct f71805f_data *data = f71805f_update_device(dev);
559 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
560 int nr = attr->index;
561
562 return sprintf(buf, "%lu\n", pwm_freq_from_reg(data->pwm_freq[nr]));
563}
564
529static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, 565static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr,
530 const char *buf, size_t count) 566 const char *buf, size_t count)
531{ 567{
@@ -592,6 +628,22 @@ static ssize_t set_pwm_enable(struct device *dev, struct device_attribute
592 return count; 628 return count;
593} 629}
594 630
631static ssize_t set_pwm_freq(struct device *dev, struct device_attribute
632 *devattr, const char *buf, size_t count)
633{
634 struct f71805f_data *data = dev_get_drvdata(dev);
635 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
636 int nr = attr->index;
637 unsigned long val = simple_strtoul(buf, NULL, 10);
638
639 mutex_lock(&data->update_lock);
640 data->pwm_freq[nr] = pwm_freq_to_reg(val);
641 f71805f_write8(data, F71805F_REG_PWM_FREQ(nr), data->pwm_freq[nr]);
642 mutex_unlock(&data->update_lock);
643
644 return count;
645}
646
595static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, 647static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
596 char *buf) 648 char *buf)
597{ 649{
@@ -785,12 +837,18 @@ static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO, show_temp_type, NULL, 2);
785static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO, show_pwm, set_pwm, 0); 837static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO, show_pwm, set_pwm, 0);
786static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, 838static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
787 show_pwm_enable, set_pwm_enable, 0); 839 show_pwm_enable, set_pwm_enable, 0);
840static SENSOR_DEVICE_ATTR(pwm1_freq, S_IRUGO | S_IWUSR,
841 show_pwm_freq, set_pwm_freq, 0);
788static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO, show_pwm, set_pwm, 1); 842static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO, show_pwm, set_pwm, 1);
789static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR, 843static SENSOR_DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR,
790 show_pwm_enable, set_pwm_enable, 1); 844 show_pwm_enable, set_pwm_enable, 1);
845static SENSOR_DEVICE_ATTR(pwm2_freq, S_IRUGO | S_IWUSR,
846 show_pwm_freq, set_pwm_freq, 1);
791static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO, show_pwm, set_pwm, 2); 847static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO, show_pwm, set_pwm, 2);
792static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR, 848static SENSOR_DEVICE_ATTR(pwm3_enable, S_IRUGO | S_IWUSR,
793 show_pwm_enable, set_pwm_enable, 2); 849 show_pwm_enable, set_pwm_enable, 2);
850static SENSOR_DEVICE_ATTR(pwm3_freq, S_IRUGO | S_IWUSR,
851 show_pwm_freq, set_pwm_freq, 2);
794 852
795static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); 853static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
796static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); 854static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
@@ -879,13 +937,14 @@ static const struct attribute_group f71805f_group = {
879 .attrs = f71805f_attributes, 937 .attrs = f71805f_attributes,
880}; 938};
881 939
882static struct attribute *f71805f_attributes_fan[3][6] = { 940static struct attribute *f71805f_attributes_fan[3][7] = {
883 { 941 {
884 &sensor_dev_attr_fan1_input.dev_attr.attr, 942 &sensor_dev_attr_fan1_input.dev_attr.attr,
885 &sensor_dev_attr_fan1_min.dev_attr.attr, 943 &sensor_dev_attr_fan1_min.dev_attr.attr,
886 &sensor_dev_attr_fan1_alarm.dev_attr.attr, 944 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
887 &sensor_dev_attr_pwm1.dev_attr.attr, 945 &sensor_dev_attr_pwm1.dev_attr.attr,
888 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 946 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
947 &sensor_dev_attr_pwm1_freq.dev_attr.attr,
889 NULL 948 NULL
890 }, { 949 }, {
891 &sensor_dev_attr_fan2_input.dev_attr.attr, 950 &sensor_dev_attr_fan2_input.dev_attr.attr,
@@ -893,6 +952,7 @@ static struct attribute *f71805f_attributes_fan[3][6] = {
893 &sensor_dev_attr_fan2_alarm.dev_attr.attr, 952 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
894 &sensor_dev_attr_pwm2.dev_attr.attr, 953 &sensor_dev_attr_pwm2.dev_attr.attr,
895 &sensor_dev_attr_pwm2_enable.dev_attr.attr, 954 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
955 &sensor_dev_attr_pwm2_freq.dev_attr.attr,
896 NULL 956 NULL
897 }, { 957 }, {
898 &sensor_dev_attr_fan3_input.dev_attr.attr, 958 &sensor_dev_attr_fan3_input.dev_attr.attr,
@@ -900,6 +960,7 @@ static struct attribute *f71805f_attributes_fan[3][6] = {
900 &sensor_dev_attr_fan3_alarm.dev_attr.attr, 960 &sensor_dev_attr_fan3_alarm.dev_attr.attr,
901 &sensor_dev_attr_pwm3.dev_attr.attr, 961 &sensor_dev_attr_pwm3.dev_attr.attr,
902 &sensor_dev_attr_pwm3_enable.dev_attr.attr, 962 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
963 &sensor_dev_attr_pwm3_freq.dev_attr.attr,
903 NULL 964 NULL
904 } 965 }
905}; 966};