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- // SPDX-License-Identifier: GPL-2.0+
- #include <common.h>
- #include <cros_ec.h>
- #include <dm.h>
- #include <errno.h>
- #include <log.h>
- #include <pwm.h>
- struct cros_ec_pwm_priv {
- bool enabled;
- uint duty;
- };
- static int cros_ec_pwm_set_config(struct udevice *dev, uint channel,
- uint period_ns, uint duty_ns)
- {
- struct cros_ec_pwm_priv *priv = dev_get_priv(dev);
- uint duty;
- int ret;
- debug("%s: period_ns=%u, duty_ns=%u asked\n", __func__,
- period_ns, duty_ns);
- /* No way to set the period, only a relative duty cycle */
- duty = EC_PWM_MAX_DUTY * duty_ns / period_ns;
- if (duty > EC_PWM_MAX_DUTY)
- duty = EC_PWM_MAX_DUTY;
- if (!priv->enabled) {
- priv->duty = duty;
- debug("%s: duty=%#x to-be-set\n", __func__, duty);
- return 0;
- }
- ret = cros_ec_set_pwm_duty(dev->parent, channel, duty);
- if (ret) {
- debug("%s: duty=%#x failed\n", __func__, duty);
- return ret;
- }
- priv->duty = duty;
- debug("%s: duty=%#x set\n", __func__, duty);
- return 0;
- }
- static int cros_ec_pwm_set_enable(struct udevice *dev, uint channel,
- bool enable)
- {
- struct cros_ec_pwm_priv *priv = dev_get_priv(dev);
- int ret;
- ret = cros_ec_set_pwm_duty(dev->parent, channel,
- enable ? priv->duty : 0);
- if (ret) {
- debug("%s: enable=%d failed\n", __func__, enable);
- return ret;
- }
- priv->enabled = enable;
- debug("%s: enable=%d (duty=%#x) set\n", __func__,
- enable, priv->duty);
- return 0;
- }
- static const struct pwm_ops cros_ec_pwm_ops = {
- .set_config = cros_ec_pwm_set_config,
- .set_enable = cros_ec_pwm_set_enable,
- };
- static const struct udevice_id cros_ec_pwm_ids[] = {
- { .compatible = "google,cros-ec-pwm" },
- { }
- };
- U_BOOT_DRIVER(cros_ec_pwm) = {
- .name = "cros_ec_pwm",
- .id = UCLASS_PWM,
- .of_match = cros_ec_pwm_ids,
- .ops = &cros_ec_pwm_ops,
- .priv_auto = sizeof(struct cros_ec_pwm_priv),
- };
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