mfd: pm8xxx-pwm: add two APIs
These new APIs allow a driver to specify its PWM period,
and raw PWM values separately using chip specific
parameters.
Change-Id: I3e9860f30a50d4f3d9c556133761d51858d2a2e3
Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>
diff --git a/drivers/mfd/pm8xxx-pwm.c b/drivers/mfd/pm8xxx-pwm.c
index da3d124..ca9eebb 100644
--- a/drivers/mfd/pm8xxx-pwm.c
+++ b/drivers/mfd/pm8xxx-pwm.c
@@ -110,6 +110,8 @@
/* LUT_CFG1 */
#define PM8XXX_PWM_LUT_READ 0x40
+
+
/*
* PWM Frequency = Clock Frequency / (N * T)
* or
@@ -718,6 +720,86 @@
EXPORT_SYMBOL_GPL(pwm_disable);
/**
+ * pm8xxx_pwm_config_period - change PWM period
+ *
+ * @pwm: the PWM device
+ * @pwm_p: period in struct pm8xxx_pwm_period
+ */
+int pm8xxx_pwm_config_period(struct pwm_device *pwm,
+ struct pm8xxx_pwm_period *period)
+{
+ int rc;
+
+ if (pwm == NULL || IS_ERR(pwm) || period == NULL)
+ return -EINVAL;
+ if (pwm->chip == NULL)
+ return -ENODEV;
+
+ mutex_lock(&pwm->chip->pwm_mutex);
+
+ if (!pwm->in_use) {
+ rc = -EINVAL;
+ goto out_unlock;
+ }
+
+ pwm->period.pwm_size = period->pwm_size;
+ pwm->period.clk = period->clk;
+ pwm->period.pre_div = period->pre_div;
+ pwm->period.pre_div_exp = period->pre_div_exp;
+
+ pm8xxx_pwm_save_period(pwm);
+ pm8xxx_pwm_bank_sel(pwm);
+ rc = pm8xxx_pwm_write(pwm, 4, 6);
+
+out_unlock:
+ mutex_unlock(&pwm->chip->pwm_mutex);
+ return rc;
+}
+EXPORT_SYMBOL(pm8xxx_pwm_config_period);
+
+/**
+ * pm8xxx_pwm_config_pwm_value - change a PWM device configuration
+ * @pwm: the PWM device
+ * @pwm_value: the duty cycle in raw PWM value (< 2^pwm_size)
+ */
+int pm8xxx_pwm_config_pwm_value(struct pwm_device *pwm, int pwm_value)
+{
+ int rc = 0;
+
+ if (pwm == NULL || IS_ERR(pwm))
+ return -EINVAL;
+ if (pwm->chip == NULL)
+ return -ENODEV;
+
+ mutex_lock(&pwm->chip->pwm_mutex);
+
+ if (!pwm->in_use || !pwm->pwm_period) {
+ rc = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (pwm->pwm_value == pwm_value)
+ goto out_unlock;
+
+ pwm->pwm_value = pwm_value;
+
+ pm8xxx_pwm_save_pwm_value(pwm);
+ pm8xxx_pwm_save(&pwm->pwm_ctl[1],
+ PM8XXX_PWM_BYPASS_LUT, PM8XXX_PWM_BYPASS_LUT);
+
+ pm8xxx_pwm_bank_sel(pwm);
+ rc = pm8xxx_pwm_write(pwm, 1, 6);
+
+ if (rc)
+ pr_err("[%d]: pm8xxx_pwm_write: rc=%d\n", pwm->pwm_id, rc);
+
+out_unlock:
+ mutex_unlock(&pwm->chip->pwm_mutex);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(pm8xxx_pwm_config_pwm_value);
+
+/**
* pm8xxx_pwm_lut_config - change a PWM device configuration to use LUT
* @pwm: the PWM device
* @period_us: period in microseconds
diff --git a/include/linux/mfd/pm8xxx/pwm.h b/include/linux/mfd/pm8xxx/pwm.h
index 2eca994..b15645d 100644
--- a/include/linux/mfd/pm8xxx/pwm.h
+++ b/include/linux/mfd/pm8xxx/pwm.h
@@ -78,6 +78,22 @@
};
/**
+ * pm8xxx_pwm_config_period - change PWM period
+ *
+ * @pwm: the PWM device
+ * @pwm_p: period in struct pm8xxx_pwm_period
+ */
+int pm8xxx_pwm_config_period(struct pwm_device *pwm,
+ struct pm8xxx_pwm_period *pwm_p);
+
+/**
+ * pm8xxx_pwm_config_pwm_value - change a PWM device configuration
+ * @pwm: the PWM device
+ * @pwm_value: the duty cycle in raw PWM value (< 2^pwm_size)
+ */
+int pm8xxx_pwm_config_pwm_value(struct pwm_device *pwm, int pwm_value);
+
+/**
* pm8xxx_pwm_lut_config - change a PWM device configuration to use LUT
* @pwm: the PWM device
* @period_us: period in micro second