--- /dev/null
+/*
+ * da9211-regulator.c - Regulator device driver for DA9211/DA9213
+ * Copyright (C) 2014 Dialog Semiconductor Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library 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/of_gpio.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/da9211.h>
+#include "da9211-regulator.h"
+
+/* DEVICE IDs */
+#define DA9211_DEVICE_ID 0x22
+#define DA9213_DEVICE_ID 0x23
+
+#define DA9211_BUCK_MODE_SLEEP 1
+#define DA9211_BUCK_MODE_SYNC 2
+#define DA9211_BUCK_MODE_AUTO 3
+
+/* DA9211 REGULATOR IDs */
+#define DA9211_ID_BUCKA 0
+#define DA9211_ID_BUCKB 1
+
+struct da9211 {
+ struct device *dev;
+ struct regmap *regmap;
+ struct da9211_pdata *pdata;
+ struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
+ int num_regulator;
+ int chip_irq;
+ int chip_id;
+};
+
+static const struct regmap_range_cfg da9211_regmap_range[] = {
+ {
+ .selector_reg = DA9211_REG_PAGE_CON,
+ .selector_mask = DA9211_REG_PAGE_MASK,
+ .selector_shift = DA9211_REG_PAGE_SHIFT,
+ .window_start = 0,
+ .window_len = 256,
+ .range_min = 0,
+ .range_max = 5*128,
+ },
+};
+
+static const struct regmap_config da9211_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 5 * 128,
+ .ranges = da9211_regmap_range,
+ .num_ranges = ARRAY_SIZE(da9211_regmap_range),
+};
+
+/* Default limits measured in millivolts and milliamps */
+#define DA9211_MIN_MV 300
+#define DA9211_MAX_MV 1570
+#define DA9211_STEP_MV 10
+
+/* Current limits for DA9211 buck (uA) indices
+ * corresponds with register values
+ */
+static const int da9211_current_limits[] = {
+ 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
+ 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
+};
+/* Current limits for DA9213 buck (uA) indices
+ * corresponds with register values
+ */
+static const int da9213_current_limits[] = {
+ 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
+ 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
+};
+
+static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
+{
+ int id = rdev_get_id(rdev);
+ struct da9211 *chip = rdev_get_drvdata(rdev);
+ unsigned int data;
+ int ret, mode = 0;
+
+ ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
+ if (ret < 0)
+ return ret;
+
+ switch (data & 0x03) {
+ case DA9211_BUCK_MODE_SYNC:
+ mode = REGULATOR_MODE_FAST;
+ break;
+ case DA9211_BUCK_MODE_AUTO:
+ mode = REGULATOR_MODE_NORMAL;
+ break;
+ case DA9211_BUCK_MODE_SLEEP:
+ mode = REGULATOR_MODE_STANDBY;
+ break;
+ }
+
+ return mode;
+}
+
+static int da9211_buck_set_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ int id = rdev_get_id(rdev);
+ struct da9211 *chip = rdev_get_drvdata(rdev);
+ int val = 0;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ val = DA9211_BUCK_MODE_SYNC;
+ break;
+ case REGULATOR_MODE_NORMAL:
+ val = DA9211_BUCK_MODE_AUTO;
+ break;
+ case REGULATOR_MODE_STANDBY:
+ val = DA9211_BUCK_MODE_SLEEP;
+ break;
+ }
+
+ return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
+ 0x03, val);
+}
+
+static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
+ int max)
+{
+ int id = rdev_get_id(rdev);
+ struct da9211 *chip = rdev_get_drvdata(rdev);
+ int i, max_size;
+ const int *current_limits;
+
+ switch (chip->chip_id) {
+ case DA9211:
+ current_limits = da9211_current_limits;
+ max_size = ARRAY_SIZE(da9211_current_limits)-1;
+ break;
+ case DA9213:
+ current_limits = da9213_current_limits;
+ max_size = ARRAY_SIZE(da9213_current_limits)-1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* search for closest to maximum */
+ for (i = max_size; i >= 0; i--) {
+ if (min <= current_limits[i] &&
+ max >= current_limits[i]) {
+ return regmap_update_bits(chip->regmap,
+ DA9211_REG_BUCK_ILIM,
+ (0x0F << id*4), (i << id*4));
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int da9211_get_current_limit(struct regulator_dev *rdev)
+{
+ int id = rdev_get_id(rdev);
+ struct da9211 *chip = rdev_get_drvdata(rdev);
+ unsigned int data;
+ int ret;
+ const int *current_limits;
+
+ switch (chip->chip_id) {
+ case DA9211:
+ current_limits = da9211_current_limits;
+ break;
+ case DA9213:
+ current_limits = da9213_current_limits;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
+ if (ret < 0)
+ return ret;
+
+ /* select one of 16 values: 0000 (2000mA or 3000mA)
+ * to 1111 (5000mA or 6000mA).
+ */
+ data = (data >> id*4) & 0x0F;
+ return current_limits[data];
+}
+
+static struct regulator_ops da9211_buck_ops = {
+ .get_mode = da9211_buck_get_mode,
+ .set_mode = da9211_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 = da9211_set_current_limit,
+ .get_current_limit = da9211_get_current_limit,
+};
+
+#define DA9211_BUCK(_id) \
+{\
+ .name = #_id,\
+ .ops = &da9211_buck_ops,\
+ .type = REGULATOR_VOLTAGE,\
+ .id = DA9211_ID_##_id,\
+ .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
+ .min_uV = (DA9211_MIN_MV * 1000),\
+ .uV_step = (DA9211_STEP_MV * 1000),\
+ .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
+ .enable_mask = DA9211_BUCKA_EN,\
+ .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
+ .vsel_mask = DA9211_VBUCK_MASK,\
+ .owner = THIS_MODULE,\
+}
+
+static struct regulator_desc da9211_regulators[] = {
+ DA9211_BUCK(BUCKA),
+ DA9211_BUCK(BUCKB),
+};
+
+#ifdef CONFIG_OF
+static struct of_regulator_match da9211_matches[] = {
+ [DA9211_ID_BUCKA] = { .name = "BUCKA" },
+ [DA9211_ID_BUCKB] = { .name = "BUCKB" },
+ };
+
+static struct da9211_pdata *da9211_parse_regulators_dt(
+ struct device *dev)
+{
+ struct da9211_pdata *pdata;
+ struct device_node *node;
+ int i, num, n;
+
+ node = of_get_child_by_name(dev->of_node, "regulators");
+ if (!node) {
+ dev_err(dev, "regulators node not found\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ num = of_regulator_match(dev, node, da9211_matches,
+ ARRAY_SIZE(da9211_matches));
+ of_node_put(node);
+ if (num < 0) {
+ dev_err(dev, "Failed to match regulators\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->num_buck = num;
+
+ n = 0;
+ for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
+ if (!da9211_matches[i].init_data)
+ continue;
+
+ pdata->init_data[n] = da9211_matches[i].init_data;
+ pdata->reg_node[n] = da9211_matches[i].of_node;
+ pdata->gpio_ren[n] =
+ of_get_named_gpio(da9211_matches[i].of_node,
+ "enable-gpios", 0);
+ n++;
+ }
+
+ return pdata;
+}
+#else
+static struct da9211_pdata *da9211_parse_regulators_dt(
+ struct device *dev)
+{
+ return ERR_PTR(-ENODEV);
+}
+#endif
+
+static irqreturn_t da9211_irq_handler(int irq, void *data)
+{
+ struct da9211 *chip = data;
+ int reg_val, err, ret = IRQ_NONE;
+
+ err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val);
+ if (err < 0)
+ goto error_i2c;
+
+ if (reg_val & DA9211_E_OV_CURR_A) {
+ regulator_notifier_call_chain(chip->rdev[0],
+ REGULATOR_EVENT_OVER_CURRENT, NULL);
+
+ err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
+ DA9211_E_OV_CURR_A);
+ if (err < 0)
+ goto error_i2c;
+
+ ret = IRQ_HANDLED;
+ }
+
+ if (reg_val & DA9211_E_OV_CURR_B) {
+ regulator_notifier_call_chain(chip->rdev[1],
+ REGULATOR_EVENT_OVER_CURRENT, NULL);
+
+ err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
+ DA9211_E_OV_CURR_B);
+ 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;
+}
+
+static int da9211_regulator_init(struct da9211 *chip)
+{
+ struct regulator_config config = { };
+ int i, ret;
+ unsigned int data;
+
+ ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
+ return ret;
+ }
+
+ data &= DA9211_SLAVE_SEL;
+ /* If configuration for 1/2 bucks is different between platform data
+ * and the register, driver should exit.
+ */
+ if ((chip->pdata->num_buck == 2 && data == 0x40)
+ || (chip->pdata->num_buck == 1 && data == 0x00)) {
+ if (data == 0)
+ chip->num_regulator = 1;
+ else
+ chip->num_regulator = 2;
+ } else {
+ dev_err(chip->dev, "Configuration is mismatched\n");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < chip->num_regulator; i++) {
+ config.init_data = chip->pdata->init_data[i];
+ config.dev = chip->dev;
+ config.driver_data = chip;
+ config.regmap = chip->regmap;
+ config.of_node = chip->pdata->reg_node[i];
+
+ if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
+ config.ena_gpio = chip->pdata->gpio_ren[i];
+ config.ena_gpio_initialized = true;
+ } else {
+ config.ena_gpio = -EINVAL;
+ config.ena_gpio_initialized = false;
+ }
+
+ chip->rdev[i] = devm_regulator_register(chip->dev,
+ &da9211_regulators[i], &config);
+ if (IS_ERR(chip->rdev[i])) {
+ dev_err(chip->dev,
+ "Failed to register DA9211 regulator\n");
+ return PTR_ERR(chip->rdev[i]);
+ }
+
+ if (chip->chip_irq != 0) {
+ ret = regmap_update_bits(chip->regmap,
+ DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to update mask reg: %d\n", ret);
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * I2C driver interface functions
+ */
+static int da9211_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct da9211 *chip;
+ int error, ret;
+ unsigned int data;
+
+ chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = &i2c->dev;
+ chip->regmap = devm_regmap_init_i2c(i2c, &da9211_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);
+
+ chip->pdata = i2c->dev.platform_data;
+
+ ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
+ return ret;
+ }
+
+ switch (data) {
+ case DA9211_DEVICE_ID:
+ chip->chip_id = DA9211;
+ break;
+ case DA9213_DEVICE_ID:
+ chip->chip_id = DA9213;
+ break;
+ default:
+ dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
+ return -ENODEV;
+ }
+
+ if (!chip->pdata)
+ chip->pdata = da9211_parse_regulators_dt(chip->dev);
+
+ if (IS_ERR(chip->pdata)) {
+ dev_err(chip->dev, "No regulators defined for the platform\n");
+ return PTR_ERR(chip->pdata);
+ }
+
+ chip->chip_irq = i2c->irq;
+
+ if (chip->chip_irq != 0) {
+ ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
+ da9211_irq_handler,
+ IRQF_TRIGGER_LOW|IRQF_ONESHOT,
+ "da9211", chip);
+ if (ret != 0) {
+ dev_err(chip->dev, "Failed to request IRQ: %d\n",
+ chip->chip_irq);
+ return ret;
+ }
+ } else {
+ dev_warn(chip->dev, "No IRQ configured\n");
+ }
+
+ ret = da9211_regulator_init(chip);
+
+ if (ret < 0)
+ dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
+
+ return ret;
+}
+
+static const struct i2c_device_id da9211_i2c_id[] = {
+ {"da9211", DA9211},
+ {"da9213", DA9213},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id da9211_dt_ids[] = {
+ { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
+ { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] },
+ {},
+};
+MODULE_DEVICE_TABLE(of, da9211_dt_ids);
+#endif
+
+static struct i2c_driver da9211_regulator_driver = {
+ .driver = {
+ .name = "da9211",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(da9211_dt_ids),
+ },
+ .probe = da9211_i2c_probe,
+ .id_table = da9211_i2c_id,
+};
+
+module_i2c_driver(da9211_regulator_driver);
+
+MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
+MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff