This patch exposes fan speed reading and speed selection when possible:
a list of fan speeds is provided by the DSDT and exposed, a particular
speed can be selected using its sequence number, while 0 corresponds to
auto fan control.
Signed-off-by: Marco Chiappero <marco@xxxxxxxxxx>
---
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -2484,6 +2484,149 @@ static int sony_nc_touchpad_cleanup(stru
return 0;
}
+#define SONY_FAN_HANDLE 0x0149
+#define FAN_SPEEDS_NUM 4 /* leave some more room */
+#define FAN_ATTRS_NUM 3
+
+struct fan_control {
+ unsigned int speeds_num;
+ unsigned int speeds[4];
+ struct device_attribute attrs[3];
+};
+static struct fan_control *fan_handle;
+
+static ssize_t sony_nc_fan_control_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buffer, size_t count)
+{
+ unsigned int result;
+ unsigned long value;
+
+ if (count > 31)
+ return -EINVAL;
+ if (strict_strtoul(buffer, 10, &value)
+ || value > fan_handle->speeds_num)
+ return -EINVAL;
+
+ if (sony_call_snc_handle(SONY_FAN_HANDLE,
+ (value << 0x10) | 0x0200, &result))
+ return -EIO;
+
+ return count;
+}
+
+static ssize_t sony_nc_fan_control_show(struct device *dev,
+ struct device_attribute *attr, char *buffer)
+{
+ ssize_t count = 0;
+ unsigned int result;
+
+ if (sony_call_snc_handle(SONY_FAN_HANDLE, 0x0100, &result))
+ return -EINVAL;
+
+ count = snprintf(buffer, PAGE_SIZE, "%d\n", result & 0xff);
+ return count;
+}
+
+static ssize_t sony_nc_fan_profiles_show(struct device *dev,
+ struct device_attribute *attr, char *buffer)
+{
+ ssize_t count = 0;
+ unsigned int i;
+
+ for (i = 0; i < fan_handle->speeds_num; i++)
+ count += snprintf(buffer + count, PAGE_SIZE - count,
+ "%.4u ", fan_handle->speeds[i] * 100);
+
+ count += snprintf(buffer + count, PAGE_SIZE - count, "\n");
+
+ return count;
+}
+
+static ssize_t sony_nc_fan_speed_show(struct device *dev,
+ struct device_attribute *attr, char *buffer)
+{
+ ssize_t count = 0;
+ unsigned int result;
+
+ if (sony_call_snc_handle(SONY_FAN_HANDLE, 0x0300, &result))
+ return -EINVAL;
+
+ count = snprintf(buffer, PAGE_SIZE, "%d\n",
+ (result & 0xff) * 100);
+ return count;
+}
+
+static int sony_nc_fan_setup(struct platform_device *pd)
+{
+ int ret;
+ unsigned int i, found;
+ u8 list[FAN_SPEEDS_NUM * 2] = { 0 };
+
+ fan_handle = kzalloc(sizeof(struct fan_control), GFP_KERNEL);
+ if (!fan_handle)
+ return -ENOMEM;
+
+ ret = sony_call_snc_handle_buffer(SONY_FAN_HANDLE, 0x0000,
+ list, FAN_SPEEDS_NUM * 2);
+ if (ret < 0)
+ pr_info("unable to retrieve fan profiles table\n");
+
+ for (i = 0, found = 0;
+ list[i] != 0 && found < FAN_SPEEDS_NUM; i += 2, found++) {
+
+ fan_handle->speeds[found] = list[i+1];
+ }
+ fan_handle->speeds_num = found;
+
+ sysfs_attr_init(&fan_handle->attrs[0].attr);
+ fan_handle->attrs[0].attr.name = "fan_speed";
+ fan_handle->attrs[0].attr.mode = S_IRUGO;
+ fan_handle->attrs[0].show = sony_nc_fan_speed_show;
+
+ sysfs_attr_init(&fan_handle->attrs[1].attr);
+ fan_handle->attrs[1].attr.name = "fan_profiles";
+ fan_handle->attrs[1].attr.mode = S_IRUGO;
+ fan_handle->attrs[1].show = sony_nc_fan_profiles_show;
+
+ sysfs_attr_init(&fan_handle->attrs[2].attr);
+ fan_handle->attrs[2].attr.name = "fan_control";
+ fan_handle->attrs[2].attr.mode = S_IRUGO | S_IWUSR;
+ fan_handle->attrs[2].show = sony_nc_fan_control_show;
+ fan_handle->attrs[2].store = sony_nc_fan_control_store;
+
+ for (i = 0; i < FAN_ATTRS_NUM; i++) {
+ if (device_create_file(&pd->dev, &fan_handle->attrs[i]))
+ goto attrserror;
+ }
+
+ return 0;
+
+attrserror:
+ for (; i > 0; i--)
+ device_remove_file(&pd->dev, &fan_handle->attrs[i]);
+
+ kfree(fan_handle);
+ fan_handle = NULL;
+
+ return -1;
+}
+
+static int sony_nc_fan_cleanup(struct platform_device *pd)
+{
+ if (fan_handle) {
+ int i;
+
+ for (i = 0; i < FAN_ATTRS_NUM; i++)
+ device_remove_file(&pd->dev, &fan_handle->attrs[i]);
+
+ kfree(fan_handle);
+ fan_handle = NULL;
+ }
+
+ return 0;
+}
+
static void sony_nc_backlight_ng_read_limits(int handle,
struct sony_backlight_props *props)
@@ -2650,6 +2793,9 @@ static void sony_nc_snc_setup_handles(st
sony_gs_handle = handle;
ret = sony_nc_gsensor_setup(pd);
break;
+ case 0x0149:
+ ret = sony_nc_fan_setup(pd);
+ break;
case 0x0124:
case 0x0135:
sony_rfkill_handle = handle;
@@ -2708,6 +2854,9 @@ static void sony_nc_snc_cleanup_handles(
case 0x0147:
sony_nc_gsensor_cleanup(pd);
break;
+ case 0x0149:
+ sony_nc_fan_cleanup(pd);
+ break;
case 0x0124:
case 0x0135:
sony_nc_rfkill_cleanup();
--
To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
