#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pwm.h>
+#include <linux/gpio/consumer.h>
+
+struct pwm_continuous_reg_data {
+ unsigned int min_uV_dutycycle;
+ unsigned int max_uV_dutycycle;
+ unsigned int dutycycle_unit;
+};
struct pwm_regulator_data {
/* Shared */
/* Voltage table */
struct pwm_voltages *duty_cycle_table;
+
+ /* Continuous mode info */
+ struct pwm_continuous_reg_data continuous;
+
+ /* regulator descriptor */
+ struct regulator_desc desc;
+
+ /* Regulator ops */
+ struct regulator_ops ops;
+
int state;
- /* Continuous voltage */
- int volt_uV;
+ /* Enable GPIO */
+ struct gpio_desc *enb_gpio;
};
struct pwm_voltages {
/**
* Voltage table call-backs
*/
+static void pwm_regulator_init_state(struct regulator_dev *rdev)
+{
+ struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
+ struct pwm_state pwm_state;
+ unsigned int dutycycle;
+ int i;
+
+ pwm_get_state(drvdata->pwm, &pwm_state);
+ dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);
+
+ for (i = 0; i < rdev->desc->n_voltages; i++) {
+ if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {
+ drvdata->state = i;
+ return;
+ }
+ }
+}
+
static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
+ if (drvdata->state < 0)
+ pwm_regulator_init_state(rdev);
+
return drvdata->state;
}
unsigned selector)
{
struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
- unsigned int pwm_reg_period;
- int dutycycle;
+ struct pwm_state pstate;
int ret;
- pwm_reg_period = pwm_get_period(drvdata->pwm);
-
- dutycycle = (pwm_reg_period *
- drvdata->duty_cycle_table[selector].dutycycle) / 100;
+ pwm_init_state(drvdata->pwm, &pstate);
+ pwm_set_relative_duty_cycle(&pstate,
+ drvdata->duty_cycle_table[selector].dutycycle, 100);
- ret = pwm_config(drvdata->pwm, dutycycle, pwm_reg_period);
+ ret = pwm_apply_state(drvdata->pwm, &pstate);
if (ret) {
- dev_err(&rdev->dev, "Failed to configure PWM\n");
+ dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
return ret;
}
{
struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
+ if (drvdata->enb_gpio)
+ gpiod_set_value_cansleep(drvdata->enb_gpio, 1);
+
return pwm_enable(drvdata->pwm);
}
pwm_disable(drvdata->pwm);
+ if (drvdata->enb_gpio)
+ gpiod_set_value_cansleep(drvdata->enb_gpio, 0);
+
return 0;
}
{
struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
+ if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio))
+ return false;
+
return pwm_is_enabled(drvdata->pwm);
}
-/**
- * Continuous voltage call-backs
- */
-static int pwm_voltage_to_duty_cycle_percentage(struct regulator_dev *rdev, int req_uV)
+static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
{
+ struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
+ unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
+ unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
+ unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
int min_uV = rdev->constraints->min_uV;
int max_uV = rdev->constraints->max_uV;
- int diff = max_uV - min_uV;
+ int diff_uV = max_uV - min_uV;
+ struct pwm_state pstate;
+ unsigned int diff_duty;
+ unsigned int voltage;
+
+ pwm_get_state(drvdata->pwm, &pstate);
+
+ voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
+
+ /*
+ * The dutycycle for min_uV might be greater than the one for max_uV.
+ * This is happening when the user needs an inversed polarity, but the
+ * PWM device does not support inversing it in hardware.
+ */
+ if (max_uV_duty < min_uV_duty) {
+ voltage = min_uV_duty - voltage;
+ diff_duty = min_uV_duty - max_uV_duty;
+ } else {
+ voltage = voltage - min_uV_duty;
+ diff_duty = max_uV_duty - min_uV_duty;
+ }
- return 100 - (((req_uV * 100) - (min_uV * 100)) / diff);
-}
+ voltage = DIV_ROUND_CLOSEST_ULL((u64)voltage * diff_uV, diff_duty);
-static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
-{
- struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
-
- return drvdata->volt_uV;
+ return voltage + min_uV;
}
static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
- int min_uV, int max_uV,
- unsigned *selector)
+ int req_min_uV, int req_max_uV,
+ unsigned int *selector)
{
struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
+ unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
+ unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
+ unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
unsigned int ramp_delay = rdev->constraints->ramp_delay;
- unsigned int period = pwm_get_period(drvdata->pwm);
- int duty_cycle;
+ int min_uV = rdev->constraints->min_uV;
+ int max_uV = rdev->constraints->max_uV;
+ int diff_uV = max_uV - min_uV;
+ struct pwm_state pstate;
+ int old_uV = pwm_regulator_get_voltage(rdev);
+ unsigned int diff_duty;
+ unsigned int dutycycle;
int ret;
- duty_cycle = pwm_voltage_to_duty_cycle_percentage(rdev, min_uV);
+ pwm_init_state(drvdata->pwm, &pstate);
- ret = pwm_config(drvdata->pwm, (period / 100) * duty_cycle, period);
- if (ret) {
- dev_err(&rdev->dev, "Failed to configure PWM\n");
- return ret;
- }
+ /*
+ * The dutycycle for min_uV might be greater than the one for max_uV.
+ * This is happening when the user needs an inversed polarity, but the
+ * PWM device does not support inversing it in hardware.
+ */
+ if (max_uV_duty < min_uV_duty)
+ diff_duty = min_uV_duty - max_uV_duty;
+ else
+ diff_duty = max_uV_duty - min_uV_duty;
+
+ dutycycle = DIV_ROUND_CLOSEST_ULL((u64)(req_min_uV - min_uV) *
+ diff_duty,
+ diff_uV);
+
+ if (max_uV_duty < min_uV_duty)
+ dutycycle = min_uV_duty - dutycycle;
+ else
+ dutycycle = min_uV_duty + dutycycle;
+
+ pwm_set_relative_duty_cycle(&pstate, dutycycle, duty_unit);
- ret = pwm_enable(drvdata->pwm);
+ ret = pwm_apply_state(drvdata->pwm, &pstate);
if (ret) {
- dev_err(&rdev->dev, "Failed to enable PWM\n");
+ dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
return ret;
}
- drvdata->volt_uV = min_uV;
- /* Delay required by PWM regulator to settle to the new voltage */
- usleep_range(ramp_delay, ramp_delay + 1000);
+ if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev))
+ return 0;
+
+ /* Ramp delay is in uV/uS. Adjust to uS and delay */
+ ramp_delay = DIV_ROUND_UP(abs(req_min_uV - old_uV), ramp_delay);
+ usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));
return 0;
}
if ((length < sizeof(*duty_cycle_table)) ||
(length % sizeof(*duty_cycle_table))) {
- dev_err(&pdev->dev,
- "voltage-table length(%d) is invalid\n",
+ dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
length);
return -EINVAL;
}
(u32 *)duty_cycle_table,
length / sizeof(u32));
if (ret) {
- dev_err(&pdev->dev, "Failed to read voltage-table\n");
+ dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);
return ret;
}
+ drvdata->state = -EINVAL;
drvdata->duty_cycle_table = duty_cycle_table;
- pwm_regulator_desc.ops = &pwm_regulator_voltage_table_ops;
- pwm_regulator_desc.n_voltages = length / sizeof(*duty_cycle_table);
+ memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops,
+ sizeof(drvdata->ops));
+ drvdata->desc.ops = &drvdata->ops;
+ drvdata->desc.n_voltages = length / sizeof(*duty_cycle_table);
return 0;
}
static int pwm_regulator_init_continuous(struct platform_device *pdev,
struct pwm_regulator_data *drvdata)
{
- pwm_regulator_desc.ops = &pwm_regulator_voltage_continuous_ops;
- pwm_regulator_desc.continuous_voltage_range = true;
+ u32 dutycycle_range[2] = { 0, 100 };
+ u32 dutycycle_unit = 100;
+
+ memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops,
+ sizeof(drvdata->ops));
+ drvdata->desc.ops = &drvdata->ops;
+ drvdata->desc.continuous_voltage_range = true;
+
+ of_property_read_u32_array(pdev->dev.of_node,
+ "pwm-dutycycle-range",
+ dutycycle_range, 2);
+ of_property_read_u32(pdev->dev.of_node, "pwm-dutycycle-unit",
+ &dutycycle_unit);
+
+ if (dutycycle_range[0] > dutycycle_unit ||
+ dutycycle_range[1] > dutycycle_unit)
+ return -EINVAL;
+
+ drvdata->continuous.dutycycle_unit = dutycycle_unit;
+ drvdata->continuous.min_uV_dutycycle = dutycycle_range[0];
+ drvdata->continuous.max_uV_dutycycle = dutycycle_range[1];
return 0;
}
struct regulator_dev *regulator;
struct regulator_config config = { };
struct device_node *np = pdev->dev.of_node;
+ enum gpiod_flags gpio_flags;
int ret;
if (!np) {
if (!drvdata)
return -ENOMEM;
+ memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));
+
if (of_find_property(np, "voltage-table", NULL))
ret = pwm_regulator_init_table(pdev, drvdata);
else
return ret;
init_data = of_get_regulator_init_data(&pdev->dev, np,
- &pwm_regulator_desc);
+ &drvdata->desc);
if (!init_data)
return -ENOMEM;
drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(drvdata->pwm)) {
- dev_err(&pdev->dev, "Failed to get PWM\n");
- return PTR_ERR(drvdata->pwm);
+ ret = PTR_ERR(drvdata->pwm);
+ dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
+ return ret;
}
+ if (init_data->constraints.boot_on || init_data->constraints.always_on)
+ gpio_flags = GPIOD_OUT_HIGH;
+ else
+ gpio_flags = GPIOD_OUT_LOW;
+ drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+ gpio_flags);
+ if (IS_ERR(drvdata->enb_gpio)) {
+ ret = PTR_ERR(drvdata->enb_gpio);
+ dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret);
+ return ret;
+ }
+
+ ret = pwm_adjust_config(drvdata->pwm);
+ if (ret)
+ return ret;
+
regulator = devm_regulator_register(&pdev->dev,
- &pwm_regulator_desc, &config);
+ &drvdata->desc, &config);
if (IS_ERR(regulator)) {
- dev_err(&pdev->dev, "Failed to register regulator %s\n",
- pwm_regulator_desc.name);
- return PTR_ERR(regulator);
+ ret = PTR_ERR(regulator);
+ dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
+ drvdata->desc.name, ret);
+ return ret;
}
return 0;
projects / firefly-linux-kernel-4.4.55.git / blobdiff