--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+
+enum {
+ RTQ6752_IDX_PAVDD = 0,
+ RTQ6752_IDX_NAVDD = 1,
+ RTQ6752_IDX_MAX
+};
+
+#define RTQ6752_REG_PAVDD 0x00
+#define RTQ6752_REG_NAVDD 0x01
+#define RTQ6752_REG_PAVDDONDLY 0x07
+#define RTQ6752_REG_PAVDDSSTIME 0x07
+#define RTQ6752_REG_NAVDDONDLY 0x0D
+#define RTQ6752_REG_NAVDDSSTIME 0x0E
+#define RTQ6752_REG_OPTION1 0x12
+#define RTQ6752_REG_CHSWITCH 0x16
+#define RTQ6752_REG_FAULT 0x1D
+
+#define RTQ6752_VOUT_MASK GENMASK(5, 0)
+#define RTQ6752_NAVDDEN_MASK BIT(3)
+#define RTQ6752_PAVDDEN_MASK BIT(0)
+#define RTQ6752_PAVDDAD_MASK BIT(4)
+#define RTQ6752_NAVDDAD_MASK BIT(3)
+#define RTQ6752_PAVDDF_MASK BIT(3)
+#define RTQ6752_NAVDDF_MASK BIT(0)
+#define RTQ6752_ENABLE_MASK (BIT(RTQ6752_IDX_MAX) - 1)
+
+#define RTQ6752_VOUT_MINUV 5000000
+#define RTQ6752_VOUT_STEPUV 50000
+#define RTQ6752_VOUT_NUM 47
+#define RTQ6752_I2CRDY_TIMEUS 1000
+#define RTQ6752_MINSS_TIMEUS 5000
+
+struct rtq6752_priv {
+ struct regmap *regmap;
+ struct gpio_desc *enable_gpio;
+ struct mutex lock;
+ unsigned char enable_flag;
+};
+
+static int rtq6752_set_vdd_enable(struct regulator_dev *rdev)
+{
+ struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
+ int rid = rdev_get_id(rdev), ret;
+
+ mutex_lock(&priv->lock);
+ if (!priv->enable_flag && priv->enable_gpio) {
+ gpiod_set_value(priv->enable_gpio, 1);
+
+ usleep_range(RTQ6752_I2CRDY_TIMEUS,
+ RTQ6752_I2CRDY_TIMEUS + 100);
+
+ regcache_cache_only(priv->regmap, false);
+ ret = regcache_sync(priv->regmap);
+ if (ret) {
+ mutex_unlock(&priv->lock);
+ return ret;
+ }
+ }
+
+ priv->enable_flag |= BIT(rid);
+ mutex_unlock(&priv->lock);
+
+ return regulator_enable_regmap(rdev);
+}
+
+static int rtq6752_set_vdd_disable(struct regulator_dev *rdev)
+{
+ struct rtq6752_priv *priv = rdev_get_drvdata(rdev);
+ int rid = rdev_get_id(rdev), ret;
+
+ ret = regulator_disable_regmap(rdev);
+ if (ret)
+ return ret;
+
+ mutex_lock(&priv->lock);
+ priv->enable_flag &= ~BIT(rid);
+
+ if (!priv->enable_flag && priv->enable_gpio) {
+ regcache_cache_only(priv->regmap, true);
+ regcache_mark_dirty(priv->regmap);
+
+ gpiod_set_value(priv->enable_gpio, 0);
+ }
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static int rtq6752_get_error_flags(struct regulator_dev *rdev,
+ unsigned int *flags)
+{
+ unsigned int val, events = 0;
+ const unsigned int fault_mask[] = {
+ RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK };
+ int rid = rdev_get_id(rdev), ret;
+
+ ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val);
+ if (ret)
+ return ret;
+
+ if (val & fault_mask[rid])
+ events = REGULATOR_ERROR_REGULATION_OUT;
+
+ *flags = events;
+ return 0;
+}
+
+static const struct regulator_ops rtq6752_regulator_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = rtq6752_set_vdd_enable,
+ .disable = rtq6752_set_vdd_disable,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_active_discharge = regulator_set_active_discharge_regmap,
+ .get_error_flags = rtq6752_get_error_flags,
+};
+
+static const struct regulator_desc rtq6752_regulator_descs[] = {
+ {
+ .name = "rtq6752-pavdd",
+ .of_match = of_match_ptr("pavdd"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = RTQ6752_IDX_PAVDD,
+ .n_voltages = RTQ6752_VOUT_NUM,
+ .ops = &rtq6752_regulator_ops,
+ .owner = THIS_MODULE,
+ .min_uV = RTQ6752_VOUT_MINUV,
+ .uV_step = RTQ6752_VOUT_STEPUV,
+ .enable_time = RTQ6752_MINSS_TIMEUS,
+ .vsel_reg = RTQ6752_REG_PAVDD,
+ .vsel_mask = RTQ6752_VOUT_MASK,
+ .enable_reg = RTQ6752_REG_CHSWITCH,
+ .enable_mask = RTQ6752_PAVDDEN_MASK,
+ .active_discharge_reg = RTQ6752_REG_OPTION1,
+ .active_discharge_mask = RTQ6752_PAVDDAD_MASK,
+ .active_discharge_off = RTQ6752_PAVDDAD_MASK,
+ },
+ {
+ .name = "rtq6752-navdd",
+ .of_match = of_match_ptr("navdd"),
+ .regulators_node = of_match_ptr("regulators"),
+ .id = RTQ6752_IDX_NAVDD,
+ .n_voltages = RTQ6752_VOUT_NUM,
+ .ops = &rtq6752_regulator_ops,
+ .owner = THIS_MODULE,
+ .min_uV = RTQ6752_VOUT_MINUV,
+ .uV_step = RTQ6752_VOUT_STEPUV,
+ .enable_time = RTQ6752_MINSS_TIMEUS,
+ .vsel_reg = RTQ6752_REG_NAVDD,
+ .vsel_mask = RTQ6752_VOUT_MASK,
+ .enable_reg = RTQ6752_REG_CHSWITCH,
+ .enable_mask = RTQ6752_NAVDDEN_MASK,
+ .active_discharge_reg = RTQ6752_REG_OPTION1,
+ .active_discharge_mask = RTQ6752_NAVDDAD_MASK,
+ .active_discharge_off = RTQ6752_NAVDDAD_MASK,
+ }
+};
+
+static int rtq6752_init_device_properties(struct rtq6752_priv *priv)
+{
+ u8 raw_vals[] = { 0, 0 };
+ int ret;
+
+ /* Configure PAVDD on and softstart delay time to the minimum */
+ ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals,
+ ARRAY_SIZE(raw_vals));
+ if (ret)
+ return ret;
+
+ /* Configure NAVDD on and softstart delay time to the minimum */
+ return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals,
+ ARRAY_SIZE(raw_vals));
+}
+
+static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ if (reg == RTQ6752_REG_FAULT)
+ return true;
+ return false;
+}
+
+static const struct reg_default rtq6752_reg_defaults[] = {
+ { RTQ6752_REG_PAVDD, 0x14 },
+ { RTQ6752_REG_NAVDD, 0x14 },
+ { RTQ6752_REG_PAVDDONDLY, 0x01 },
+ { RTQ6752_REG_PAVDDSSTIME, 0x01 },
+ { RTQ6752_REG_NAVDDONDLY, 0x01 },
+ { RTQ6752_REG_NAVDDSSTIME, 0x01 },
+ { RTQ6752_REG_OPTION1, 0x07 },
+ { RTQ6752_REG_CHSWITCH, 0x29 },
+};
+
+static const struct regmap_config rtq6752_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_RBTREE,
+ .max_register = RTQ6752_REG_FAULT,
+ .reg_defaults = rtq6752_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults),
+ .volatile_reg = rtq6752_is_volatile_reg,
+};
+
+static int rtq6752_probe(struct i2c_client *i2c)
+{
+ struct rtq6752_priv *priv;
+ struct regulator_config reg_cfg = {};
+ struct regulator_dev *rdev;
+ int i, ret;
+
+ priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mutex_init(&priv->lock);
+
+ priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->enable_gpio)) {
+ dev_err(&i2c->dev, "Failed to get 'enable' gpio\n");
+ return PTR_ERR(priv->enable_gpio);
+ }
+
+ usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100);
+ /* Default EN pin to high, PAVDD and NAVDD will be on */
+ priv->enable_flag = RTQ6752_ENABLE_MASK;
+
+ priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ dev_err(&i2c->dev, "Failed to init regmap\n");
+ return PTR_ERR(priv->regmap);
+ }
+
+ ret = rtq6752_init_device_properties(priv);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to init device properties\n");
+ return ret;
+ }
+
+ reg_cfg.dev = &i2c->dev;
+ reg_cfg.regmap = priv->regmap;
+ reg_cfg.driver_data = priv;
+
+ for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) {
+ rdev = devm_regulator_register(&i2c->dev,
+ rtq6752_regulator_descs + i,
+ ®_cfg);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev, "Failed to init %d regulator\n", i);
+ return PTR_ERR(rdev);
+ }
+ }
+
+ return 0;
+}
+
+static const struct of_device_id __maybe_unused rtq6752_device_table[] = {
+ { .compatible = "richtek,rtq6752", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rtq6752_device_table);
+
+static struct i2c_driver rtq6752_driver = {
+ .driver = {
+ .name = "rtq6752",
+ .of_match_table = rtq6752_device_table,
+ },
+ .probe_new = rtq6752_probe,
+};
+module_i2c_driver(rtq6752_driver);
+
+MODULE_AUTHOR("ChiYuan Hwang <cy_huang@richtek.com>");
+MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver");
+MODULE_LICENSE("GPL v2");
projects / linux-2.6-microblaze.git / commitdiff