@@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/sysfs.h>
#include <linux/regmap.h>
+#include <linux/thermal.h>
/* ASPEED PWM & FAN Tach Register Definition */
#define ASPEED_PTCR_CTRL 0x00
@@ -166,6 +167,18 @@
/* How long we sleep in us while waiting for an RPM result. */
#define ASPEED_RPM_STATUS_SLEEP_USEC 500
+#define MAX_CDEV_NAME_LEN 16
+
+struct aspeed_cooling_device {
+ char name[16];
+ struct aspeed_pwm_tacho_data *priv;
+ struct thermal_cooling_device *tcdev;
+ int pwm_port;
+ u8 *cooling_levels;
+ u8 max_state;
+ u8 cur_state;
+};
+
struct aspeed_pwm_tacho_data {
struct regmap *regmap;
unsigned long clk_freq;
@@ -180,6 +193,7 @@ struct aspeed_pwm_tacho_data {
u8 pwm_port_type[8];
u8 pwm_port_fan_ctrl[8];
u8 fan_tach_ch_source[16];
+ struct aspeed_cooling_device *cdev[8];
const struct attribute_group *groups[3];
};
@@ -765,6 +779,94 @@ static void aspeed_create_fan_tach_channel(struct aspeed_pwm_tacho_data *priv,
}
}
+static int
+aspeed_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
+ unsigned long *state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ *state = cdev->max_state;
+
+ return 0;
+}
+
+static int
+aspeed_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
+ unsigned long *state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ *state = cdev->cur_state;
+
+ return 0;
+}
+
+static int
+aspeed_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
+ unsigned long state)
+{
+ struct aspeed_cooling_device *cdev = tcdev->devdata;
+
+ if (state > cdev->max_state)
+ return -EINVAL;
+
+ cdev->cur_state = state;
+ cdev->priv->pwm_port_fan_ctrl[cdev->pwm_port] =
+ cdev->cooling_levels[cdev->cur_state];
+ aspeed_set_pwm_port_fan_ctrl(cdev->priv, cdev->pwm_port,
+ cdev->cooling_levels[cdev->cur_state]);
+
+ return 0;
+}
+
+static const struct thermal_cooling_device_ops aspeed_pwm_cool_ops = {
+ .get_max_state = aspeed_pwm_cz_get_max_state,
+ .get_cur_state = aspeed_pwm_cz_get_cur_state,
+ .set_cur_state = aspeed_pwm_cz_set_cur_state,
+};
+
+static int aspeed_create_pwm_cooling(struct device *dev,
+ struct device_node *child,
+ struct aspeed_pwm_tacho_data *priv,
+ u32 pwm_port, u8 num_levels)
+{
+ int ret;
+ struct aspeed_cooling_device *cdev;
+
+ cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
+
+ if (!cdev)
+ return -ENOMEM;
+
+ cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
+ if (!cdev->cooling_levels)
+ return -ENOMEM;
+
+ cdev->max_state = num_levels - 1;
+ ret = of_property_read_u8_array(child, "cooling-levels",
+ cdev->cooling_levels,
+ num_levels);
+ if (ret) {
+ dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
+ return ret;
+ }
+ snprintf(cdev->name, MAX_CDEV_NAME_LEN, "%s%d", child->name, pwm_port);
+
+ cdev->tcdev = thermal_of_cooling_device_register(child,
+ cdev->name,
+ cdev,
+ &aspeed_pwm_cool_ops);
+ if (IS_ERR(cdev->tcdev))
+ return PTR_ERR(cdev->tcdev);
+
+ cdev->priv = priv;
+ cdev->pwm_port = pwm_port;
+
+ priv->cdev[pwm_port] = cdev;
+
+ return 0;
+}
+
static int aspeed_create_fan(struct device *dev,
struct device_node *child,
struct aspeed_pwm_tacho_data *priv)
@@ -778,6 +880,15 @@ static int aspeed_create_fan(struct device *dev,
return ret;
aspeed_create_pwm_port(priv, (u8)pwm_port);
+ ret = of_property_count_u8_elems(child, "cooling-levels");
+
+ if (ret > 0) {
+ ret = aspeed_create_pwm_cooling(dev, child, priv, pwm_port,
+ ret);
+ if (ret)
+ return ret;
+ }
+
count = of_property_count_u8_elems(child, "aspeed,fan-tach-ch");
if (count < 1)
return -EINVAL;
@@ -834,9 +945,10 @@ static int aspeed_pwm_tacho_probe(struct platform_device *pdev)
for_each_child_of_node(np, child) {
ret = aspeed_create_fan(dev, child, priv);
- of_node_put(child);
- if (ret)
+ if (ret) {
+ of_node_put(child);
return ret;
+ }
}
priv->groups[0] = &pwm_dev_group;