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path: root/drivers/regulator/max77693.c
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Diffstat (limited to 'drivers/regulator/max77693.c')
-rw-r--r--drivers/regulator/max77693.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
new file mode 100644
index 0000000..674ece7
--- /dev/null
+++ b/drivers/regulator/max77693.c
@@ -0,0 +1,324 @@
+/*
+ * max77693.c - Regulator driver for the Maxim 77693
+ *
+ * Copyright (C) 2013 Samsung Electronics
+ * Jonghwa Lee <jonghwa3.lee@samsung.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * This driver is based on max77686.c
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+#include <linux/regulator/of_regulator.h>
+
+#define CHGIN_ILIM_STEP_20mA 20000
+
+struct max77693_pmic_dev {
+ struct device *dev;
+ struct max77693_dev *iodev;
+ int num_regulators;
+ struct regulator_dev **rdev;
+};
+
+/* CHARGER regulator ops */
+/* CHARGER regulator uses two bits for enabling */
+static int max77693_chg_is_enabled(struct regulator_dev *rdev)
+{
+ int ret;
+ u8 val;
+
+ ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
+ if (ret)
+ return ret;
+
+ return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
+}
+
+/*
+ * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
+ * 0x00, 0x01, 0x2, 0x03 = 60 mA
+ * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
+ */
+static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
+{
+ unsigned int chg_min_uA = rdev->constraints->min_uA;
+ unsigned int chg_max_uA = rdev->constraints->max_uA;
+ u8 reg, sel;
+ unsigned int val;
+ int ret;
+
+ ret = max77693_read_reg(rdev->regmap,
+ MAX77693_CHG_REG_CHG_CNFG_09, &reg);
+ if (ret < 0)
+ return ret;
+
+ sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
+
+ /* the first four codes for charger current are all 60mA */
+ if (sel <= 3)
+ sel = 0;
+ else
+ sel -= 3;
+
+ val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
+ if (val > chg_max_uA)
+ return -EINVAL;
+
+ return val;
+}
+
+static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
+ int min_uA, int max_uA)
+{
+ unsigned int chg_min_uA = rdev->constraints->min_uA;
+ int sel = 0;
+
+ while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
+ sel++;
+
+ if (chg_min_uA * CHGIN_ILIM_STEP_20mA * sel > max_uA)
+ return -EINVAL;
+
+ /* the first four codes for charger current are all 60mA */
+ sel += 3;
+
+ return max77693_write_reg(rdev->regmap,
+ MAX77693_CHG_REG_CHG_CNFG_09, sel);
+}
+/* end of CHARGER regulator ops */
+
+static const unsigned int max77693_safeout_table[] = {
+ 4850000,
+ 4900000,
+ 4950000,
+ 3300000,
+};
+
+static struct regulator_ops max77693_safeout_ops = {
+ .list_voltage = regulator_list_voltage_table,
+ .is_enabled = regulator_is_enabled_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static struct regulator_ops max77693_charger_ops = {
+ .is_enabled = max77693_chg_is_enabled,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .get_current_limit = max77693_chg_get_current_limit,
+ .set_current_limit = max77693_chg_set_current_limit,
+};
+
+#define regulator_desc_esafeout(_num) { \
+ .name = "ESAFEOUT"#_num, \
+ .id = MAX77693_ESAFEOUT##_num, \
+ .n_voltages = 4, \
+ .ops = &max77693_safeout_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .volt_table = max77693_safeout_table, \
+ .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
+ .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
+ .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
+ .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
+}
+
+static struct regulator_desc regulators[] = {
+ regulator_desc_esafeout(1),
+ regulator_desc_esafeout(2),
+ {
+ .name = "CHARGER",
+ .id = MAX77693_CHARGER,
+ .ops = &max77693_charger_ops,
+ .type = REGULATOR_CURRENT,
+ .owner = THIS_MODULE,
+ .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
+ .enable_mask = CHG_CNFG_00_CHG_MASK |
+ CHG_CNFG_00_BUCK_MASK,
+ },
+};
+
+#ifdef CONFIG_OF
+static int max77693_pmic_dt_parse_rdata(struct device *dev,
+ struct max77693_regulator_data **rdata)
+{
+ struct device_node *np;
+ struct of_regulator_match *rmatch;
+ struct max77693_regulator_data *tmp;
+ int i, matched = 0;
+
+ np = of_find_node_by_name(dev->parent->of_node, "regulators");
+ if (!np)
+ return -EINVAL;
+
+ rmatch = devm_kzalloc(dev,
+ sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
+ if (!rmatch)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(regulators); i++)
+ rmatch[i].name = regulators[i].name;
+
+ matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
+ if (matched <= 0)
+ return matched;
+ *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
+ if (!(*rdata))
+ return -ENOMEM;
+
+ tmp = *rdata;
+
+ for (i = 0; i < ARRAY_SIZE(regulators); i++) {
+ if (!rmatch[i].init_data)
+ continue;
+ tmp->initdata = rmatch[i].init_data;
+ tmp->of_node = rmatch[i].of_node;
+ tmp->id = regulators[i].id;
+ tmp++;
+ }
+
+ return matched;
+}
+#else
+static int max77693_pmic_dt_parse_rdata(struct device *dev,
+ struct max77693_regulator_data **rdata)
+{
+ return 0;
+}
+#endif /* CONFIG_OF */
+
+static int max77693_pmic_init_rdata(struct device *dev,
+ struct max77693_regulator_data **rdata)
+{
+ struct max77693_platform_data *pdata;
+ int num_regulators = 0;
+
+ pdata = dev_get_platdata(dev->parent);
+ if (pdata) {
+ *rdata = pdata->regulators;
+ num_regulators = pdata->num_regulators;
+ }
+
+ if (!(*rdata) && dev->parent->of_node)
+ num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
+
+ return num_regulators;
+}
+
+static int max77693_pmic_probe(struct platform_device *pdev)
+{
+ struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct max77693_pmic_dev *max77693_pmic;
+ struct max77693_regulator_data *rdata = NULL;
+ int num_rdata, i, ret;
+ struct regulator_config config;
+
+ num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
+ if (!rdata || num_rdata <= 0) {
+ dev_err(&pdev->dev, "No init data supplied.\n");
+ return -ENODEV;
+ }
+
+ max77693_pmic = devm_kzalloc(&pdev->dev,
+ sizeof(struct max77693_pmic_dev),
+ GFP_KERNEL);
+ if (!max77693_pmic)
+ return -ENOMEM;
+
+ max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
+ sizeof(struct regulator_dev *) * num_rdata,
+ GFP_KERNEL);
+ if (!max77693_pmic->rdev)
+ return -ENOMEM;
+
+ max77693_pmic->dev = &pdev->dev;
+ max77693_pmic->iodev = iodev;
+ max77693_pmic->num_regulators = num_rdata;
+
+ config.dev = &pdev->dev;
+ config.regmap = iodev->regmap;
+ config.driver_data = max77693_pmic;
+ platform_set_drvdata(pdev, max77693_pmic);
+
+ for (i = 0; i < max77693_pmic->num_regulators; i++) {
+ int id = rdata[i].id;
+
+ config.init_data = rdata[i].initdata;
+ config.of_node = rdata[i].of_node;
+
+ max77693_pmic->rdev[i] = regulator_register(&regulators[id],
+ &config);
+ if (IS_ERR(max77693_pmic->rdev[i])) {
+ ret = PTR_ERR(max77693_pmic->rdev[i]);
+ dev_err(max77693_pmic->dev,
+ "Failed to initialize regulator-%d\n", id);
+ max77693_pmic->rdev[i] = NULL;
+ goto err;
+ }
+ }
+
+ return 0;
+ err:
+ while (--i >= 0)
+ regulator_unregister(max77693_pmic->rdev[i]);
+
+ return ret;
+}
+
+static int max77693_pmic_remove(struct platform_device *pdev)
+{
+ struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev);
+ struct regulator_dev **rdev = max77693_pmic->rdev;
+ int i;
+
+ for (i = 0; i < max77693_pmic->num_regulators; i++)
+ if (rdev[i])
+ regulator_unregister(rdev[i]);
+
+ return 0;
+}
+
+static const struct platform_device_id max77693_pmic_id[] = {
+ {"max77693-pmic", 0},
+ {},
+};
+
+MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
+
+static struct platform_driver max77693_pmic_driver = {
+ .driver = {
+ .name = "max77693-pmic",
+ .owner = THIS_MODULE,
+ },
+ .probe = max77693_pmic_probe,
+ .remove = max77693_pmic_remove,
+ .id_table = max77693_pmic_id,
+};
+
+module_platform_driver(max77693_pmic_driver);
+
+MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
+MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
+MODULE_LICENSE("GPL");
generated by cgit v0.10.2 at 2024-11-11 23:36:33 (GMT)