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authorJames Ban <James.Ban.opensource@diasemi.com>2016-04-15 07:34:22 +0300
committerMark Brown <broonie@kernel.org>2016-04-18 19:53:57 +0300
commit99cf3af5e2d5c74e016ae9517a4dced3f1dbcf6a (patch)
tree7a67c55efa3e847d4d981ac256ddadbed68e1685 /drivers/regulator/pv88080-regulator.c
parentf55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff)
downloadlinux-99cf3af5e2d5c74e016ae9517a4dced3f1dbcf6a.tar.xz
regulator: pv88080: new regulator driver
This is the driver for the Powerventure PV88080 BUCKs regulator. It communicates via an I2C bus to the device. Signed-off-by: James Ban <James.Ban..opensource@diasemi.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/pv88080-regulator.c')
-rw-r--r--drivers/regulator/pv88080-regulator.c419
1 files changed, 419 insertions, 0 deletions
diff --git a/drivers/regulator/pv88080-regulator.c b/drivers/regulator/pv88080-regulator.c
new file mode 100644
index 000000000000..d7107566c429
--- /dev/null
+++ b/drivers/regulator/pv88080-regulator.c
@@ -0,0 +1,419 @@
+/*
+ * pv88080-regulator.c - Regulator device driver for PV88080
+ * Copyright (C) 2016 Powerventure Semiconductor Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regmap.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include "pv88080-regulator.h"
+
+#define PV88080_MAX_REGULATORS 3
+
+/* PV88080 REGULATOR IDs */
+enum {
+ /* BUCKs */
+ PV88080_ID_BUCK1,
+ PV88080_ID_BUCK2,
+ PV88080_ID_BUCK3,
+};
+
+struct pv88080_regulator {
+ struct regulator_desc desc;
+ /* Current limiting */
+ unsigned int n_current_limits;
+ const int *current_limits;
+ unsigned int limit_mask;
+ unsigned int conf;
+ unsigned int conf2;
+ unsigned int conf5;
+};
+
+struct pv88080 {
+ struct device *dev;
+ struct regmap *regmap;
+ struct regulator_dev *rdev[PV88080_MAX_REGULATORS];
+};
+
+struct pv88080_buck_voltage {
+ int min_uV;
+ int max_uV;
+ int uV_step;
+};
+
+static const struct regmap_config pv88080_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
+ * Entry indexes corresponds to register values.
+ */
+
+static const int pv88080_buck1_limits[] = {
+ 3230000, 5130000, 6960000, 8790000
+};
+
+static const int pv88080_buck23_limits[] = {
+ 1496000, 2393000, 3291000, 4189000
+};
+
+static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {
+ {
+ .min_uV = 600000,
+ .max_uV = 1393750,
+ .uV_step = 6250,
+ },
+ {
+ .min_uV = 1400000,
+ .max_uV = 2193750,
+ .uV_step = 6250,
+ },
+};
+
+static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)
+{
+ struct pv88080_regulator *info = rdev_get_drvdata(rdev);
+ unsigned int data;
+ int ret, mode = 0;
+
+ ret = regmap_read(rdev->regmap, info->conf, &data);
+ if (ret < 0)
+ return ret;
+
+ switch (data & PV88080_BUCK1_MODE_MASK) {
+ case PV88080_BUCK_MODE_SYNC:
+ mode = REGULATOR_MODE_FAST;
+ break;
+ case PV88080_BUCK_MODE_AUTO:
+ mode = REGULATOR_MODE_NORMAL;
+ break;
+ case PV88080_BUCK_MODE_SLEEP:
+ mode = REGULATOR_MODE_STANDBY;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return mode;
+}
+
+static int pv88080_buck_set_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ struct pv88080_regulator *info = rdev_get_drvdata(rdev);
+ int val = 0;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = PV88080_BUCK_MODE_SYNC;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = PV88080_BUCK_MODE_AUTO;
+ break;
+ case REGULATOR_MODE_STANDBY:
+ val = PV88080_BUCK_MODE_SLEEP;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(rdev->regmap, info->conf,
+ PV88080_BUCK1_MODE_MASK, val);
+}
+
+static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,
+ int max)
+{
+ struct pv88080_regulator *info = rdev_get_drvdata(rdev);
+ int i;
+
+ /* search for closest to maximum */
+ for (i = info->n_current_limits; i >= 0; i--) {
+ if (min <= info->current_limits[i]
+ && max >= info->current_limits[i]) {
+ return regmap_update_bits(rdev->regmap,
+ info->conf,
+ info->limit_mask,
+ i << PV88080_BUCK1_ILIM_SHIFT);
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int pv88080_get_current_limit(struct regulator_dev *rdev)
+{
+ struct pv88080_regulator *info = rdev_get_drvdata(rdev);
+ unsigned int data;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, info->conf, &data);
+ if (ret < 0)
+ return ret;
+
+ data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;
+ return info->current_limits[data];
+}
+
+static struct regulator_ops pv88080_buck_ops = {
+ .get_mode = pv88080_buck_get_mode,
+ .set_mode = pv88080_buck_set_mode,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+ .set_current_limit = pv88080_set_current_limit,
+ .get_current_limit = pv88080_get_current_limit,
+};
+
+#define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \
+{\
+ .desc = {\
+ .id = chip##_ID_##regl_name,\
+ .name = __stringify(chip##_##regl_name),\
+ .of_match = of_match_ptr(#regl_name),\
+ .regulators_node = of_match_ptr("regulators"),\
+ .type = REGULATOR_VOLTAGE,\
+ .owner = THIS_MODULE,\
+ .ops = &pv88080_buck_ops,\
+ .min_uV = min, \
+ .uV_step = step, \
+ .n_voltages = ((max) - (min))/(step) + 1, \
+ .enable_reg = PV88080_REG_##regl_name##_CONF0, \
+ .enable_mask = PV88080_##regl_name##_EN, \
+ .vsel_reg = PV88080_REG_##regl_name##_CONF0, \
+ .vsel_mask = PV88080_V##regl_name##_MASK, \
+ },\
+ .current_limits = limits_array, \
+ .n_current_limits = ARRAY_SIZE(limits_array), \
+ .limit_mask = PV88080_##regl_name##_ILIM_MASK, \
+ .conf = PV88080_REG_##regl_name##_CONF1, \
+ .conf2 = PV88080_REG_##regl_name##_CONF2, \
+ .conf5 = PV88080_REG_##regl_name##_CONF5, \
+}
+
+static struct pv88080_regulator pv88080_regulator_info[] = {
+ PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,
+ pv88080_buck1_limits),
+ PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,
+ pv88080_buck23_limits),
+ PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,
+ pv88080_buck23_limits),
+};
+
+static irqreturn_t pv88080_irq_handler(int irq, void *data)
+{
+ struct pv88080 *chip = data;
+ int i, reg_val, err, ret = IRQ_NONE;
+
+ err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, &reg_val);
+ if (err < 0)
+ goto error_i2c;
+
+ if (reg_val & PV88080_E_VDD_FLT) {
+ for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
+ if (chip->rdev[i] != NULL) {
+ regulator_notifier_call_chain(chip->rdev[i],
+ REGULATOR_EVENT_UNDER_VOLTAGE,
+ NULL);
+ }
+ }
+
+ err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
+ PV88080_E_VDD_FLT);
+ if (err < 0)
+ goto error_i2c;
+
+ ret = IRQ_HANDLED;
+ }
+
+ if (reg_val & PV88080_E_OVER_TEMP) {
+ for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
+ if (chip->rdev[i] != NULL) {
+ regulator_notifier_call_chain(chip->rdev[i],
+ REGULATOR_EVENT_OVER_TEMP,
+ NULL);
+ }
+ }
+
+ err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
+ PV88080_E_OVER_TEMP);
+ if (err < 0)
+ goto error_i2c;
+
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+
+error_i2c:
+ dev_err(chip->dev, "I2C error : %d\n", err);
+ return IRQ_NONE;
+}
+
+/*
+ * I2C driver interface functions
+ */
+static int pv88080_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
+ struct pv88080 *chip;
+ struct regulator_config config = { };
+ int i, error, ret;
+ unsigned int conf2, conf5;
+
+ chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &i2c->dev;
+ chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_regmap_config);
+ if (IS_ERR(chip->regmap)) {
+ error = PTR_ERR(chip->regmap);
+ dev_err(chip->dev, "Failed to allocate register map: %d\n",
+ error);
+ return error;
+ }
+
+ i2c_set_clientdata(i2c, chip);
+
+ if (i2c->irq != 0) {
+ ret = regmap_write(chip->regmap, PV88080_REG_MASK_A, 0xFF);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to mask A reg: %d\n", ret);
+ return ret;
+ }
+ ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to mask B reg: %d\n", ret);
+ return ret;
+ }
+ ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to mask C reg: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
+ pv88080_irq_handler,
+ IRQF_TRIGGER_LOW|IRQF_ONESHOT,
+ "pv88080", chip);
+ if (ret != 0) {
+ dev_err(chip->dev, "Failed to request IRQ: %d\n",
+ i2c->irq);
+ return ret;
+ }
+
+ ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A,
+ PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to update mask reg: %d\n", ret);
+ return ret;
+ }
+
+ } else {
+ dev_warn(chip->dev, "No IRQ configured\n");
+ }
+
+ config.dev = chip->dev;
+ config.regmap = chip->regmap;
+
+ for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
+ if (init_data)
+ config.init_data = &init_data[i];
+
+ ret = regmap_read(chip->regmap,
+ pv88080_regulator_info[i].conf2, &conf2);
+ if (ret < 0)
+ return ret;
+
+ conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &
+ PV88080_BUCK_VDAC_RANGE_MASK);
+
+ ret = regmap_read(chip->regmap,
+ pv88080_regulator_info[i].conf5, &conf5);
+ if (ret < 0)
+ return ret;
+
+ conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &
+ PV88080_BUCK_VRANGE_GAIN_MASK);
+
+ pv88080_regulator_info[i].desc.min_uV =
+ pv88080_buck_vol[conf2].min_uV * (conf5+1);
+ pv88080_regulator_info[i].desc.uV_step =
+ pv88080_buck_vol[conf2].uV_step * (conf5+1);
+ pv88080_regulator_info[i].desc.n_voltages =
+ ((pv88080_buck_vol[conf2].max_uV * (conf5+1))
+ - (pv88080_regulator_info[i].desc.min_uV))
+ /(pv88080_regulator_info[i].desc.uV_step) + 1;
+
+ config.driver_data = (void *)&pv88080_regulator_info[i];
+ chip->rdev[i] = devm_regulator_register(chip->dev,
+ &pv88080_regulator_info[i].desc, &config);
+ if (IS_ERR(chip->rdev[i])) {
+ dev_err(chip->dev,
+ "Failed to register PV88080 regulator\n");
+ return PTR_ERR(chip->rdev[i]);
+ }
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id pv88080_i2c_id[] = {
+ {"pv88080", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id pv88080_dt_ids[] = {
+ { .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pv88080_dt_ids);
+#endif
+
+static struct i2c_driver pv88080_regulator_driver = {
+ .driver = {
+ .name = "pv88080",
+ .of_match_table = of_match_ptr(pv88080_dt_ids),
+ },
+ .probe = pv88080_i2c_probe,
+ .id_table = pv88080_i2c_id,
+};
+
+module_i2c_driver(pv88080_regulator_driver);
+
+MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
+MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");
+MODULE_LICENSE("GPL");