drivers: regulator: add Maxim 8998 driver
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This patch adds voltage regulator driver for Maxim 8998 chip. This chip
is used on Samsung Aquila and GONI boards and provides following
functionalities:
- 4 BUCK voltage converters, 17 LDO power regulators and 5 other power
controllers
- battery charger
This patch adds basic driver for voltage regulators and MAX 8998 MFD core.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
new file mode 100644
index 0000000..174fd19
--- /dev/null
+++ b/drivers/regulator/max8998.c
@@ -0,0 +1,610 @@
+/*
+ * max8998.c - Voltage regulator driver for the Maxim 8998
+ *
+ * Copyright (C) 2009-2010 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ * Marek Szyprowski <m.szyprowski@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
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/max8998.h>
+#include <linux/mfd/max8998-private.h>
+
+struct max8998_data {
+ struct device *dev;
+ struct max8998_dev *iodev;
+ int num_regulators;
+ struct regulator_dev **rdev;
+};
+
+struct voltage_map_desc {
+ int min;
+ int max;
+ int step;
+};
+
+/* Voltage maps */
+static const struct voltage_map_desc ldo23_voltage_map_desc = {
+ .min = 800, .step = 50, .max = 1300,
+};
+static const struct voltage_map_desc ldo456711_voltage_map_desc = {
+ .min = 1600, .step = 100, .max = 3600,
+};
+static const struct voltage_map_desc ldo8_voltage_map_desc = {
+ .min = 3000, .step = 100, .max = 3600,
+};
+static const struct voltage_map_desc ldo9_voltage_map_desc = {
+ .min = 2800, .step = 100, .max = 3100,
+};
+static const struct voltage_map_desc ldo10_voltage_map_desc = {
+ .min = 950, .step = 50, .max = 1300,
+};
+static const struct voltage_map_desc ldo1213_voltage_map_desc = {
+ .min = 800, .step = 100, .max = 3300,
+};
+static const struct voltage_map_desc ldo1415_voltage_map_desc = {
+ .min = 1200, .step = 100, .max = 3300,
+};
+static const struct voltage_map_desc ldo1617_voltage_map_desc = {
+ .min = 1600, .step = 100, .max = 3600,
+};
+static const struct voltage_map_desc buck12_voltage_map_desc = {
+ .min = 750, .step = 25, .max = 1525,
+};
+static const struct voltage_map_desc buck3_voltage_map_desc = {
+ .min = 1600, .step = 100, .max = 3600,
+};
+static const struct voltage_map_desc buck4_voltage_map_desc = {
+ .min = 800, .step = 100, .max = 2300,
+};
+
+static const struct voltage_map_desc *ldo_voltage_map[] = {
+ NULL,
+ NULL,
+ &ldo23_voltage_map_desc, /* LDO2 */
+ &ldo23_voltage_map_desc, /* LDO3 */
+ &ldo456711_voltage_map_desc, /* LDO4 */
+ &ldo456711_voltage_map_desc, /* LDO5 */
+ &ldo456711_voltage_map_desc, /* LDO6 */
+ &ldo456711_voltage_map_desc, /* LDO7 */
+ &ldo8_voltage_map_desc, /* LDO8 */
+ &ldo9_voltage_map_desc, /* LDO9 */
+ &ldo10_voltage_map_desc, /* LDO10 */
+ &ldo456711_voltage_map_desc, /* LDO11 */
+ &ldo1213_voltage_map_desc, /* LDO12 */
+ &ldo1213_voltage_map_desc, /* LDO13 */
+ &ldo1415_voltage_map_desc, /* LDO14 */
+ &ldo1415_voltage_map_desc, /* LDO15 */
+ &ldo1617_voltage_map_desc, /* LDO16 */
+ &ldo1617_voltage_map_desc, /* LDO17 */
+ &buck12_voltage_map_desc, /* BUCK1 */
+ &buck12_voltage_map_desc, /* BUCK2 */
+ &buck3_voltage_map_desc, /* BUCK3 */
+ &buck4_voltage_map_desc, /* BUCK4 */
+};
+
+static inline int max8998_get_ldo(struct regulator_dev *rdev)
+{
+ return rdev_get_id(rdev);
+}
+
+static int max8998_list_voltage(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ const struct voltage_map_desc *desc;
+ int ldo = max8998_get_ldo(rdev);
+ int val;
+
+ if (ldo > ARRAY_SIZE(ldo_voltage_map))
+ return -EINVAL;
+
+ desc = ldo_voltage_map[ldo];
+ if (desc == NULL)
+ return -EINVAL;
+
+ val = desc->min + desc->step * selector;
+ if (val > desc->max)
+ return -EINVAL;
+
+ return val * 1000;
+}
+
+static int max8998_get_enable_register(struct regulator_dev *rdev,
+ int *reg, int *shift)
+{
+ int ldo = max8998_get_ldo(rdev);
+
+ switch (ldo) {
+ case MAX8998_LDO2 ... MAX8998_LDO5:
+ *reg = MAX8998_REG_ONOFF1;
+ *shift = 3 - (ldo - MAX8998_LDO2);
+ break;
+ case MAX8998_LDO6 ... MAX8998_LDO13:
+ *reg = MAX8998_REG_ONOFF2;
+ *shift = 7 - (ldo - MAX8998_LDO6);
+ break;
+ case MAX8998_LDO14 ... MAX8998_LDO17:
+ *reg = MAX8998_REG_ONOFF3;
+ *shift = 7 - (ldo - MAX8998_LDO14);
+ break;
+ case MAX8998_BUCK1 ... MAX8998_BUCK4:
+ *reg = MAX8998_REG_ONOFF1;
+ *shift = 7 - (ldo - MAX8998_BUCK1);
+ break;
+ case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
+ *reg = MAX8998_REG_ONOFF4;
+ *shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
+ break;
+ case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
+ *reg = MAX8998_REG_CHGR2;
+ *shift = 7 - (ldo - MAX8998_ESAFEOUT1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int ret, reg, shift = 8;
+ u8 val;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ ret = max8998_read_reg(max8998->iodev, reg, &val);
+ if (ret)
+ return ret;
+
+ return val & (1 << shift);
+}
+
+static int max8998_ldo_enable(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int reg, shift = 8, ret;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ return max8998_update_reg(max8998->iodev, reg, 1<<shift, 1<<shift);
+}
+
+static int max8998_ldo_disable(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int reg, shift = 8, ret;
+
+ ret = max8998_get_enable_register(rdev, ®, &shift);
+ if (ret)
+ return ret;
+
+ return max8998_update_reg(max8998->iodev, reg, 0, 1<<shift);
+}
+
+static int max8998_get_voltage_register(struct regulator_dev *rdev,
+ int *_reg, int *_shift, int *_mask)
+{
+ int ldo = max8998_get_ldo(rdev);
+ int reg, shift = 0, mask = 0xff;
+
+ switch (ldo) {
+ case MAX8998_LDO2 ... MAX8998_LDO3:
+ reg = MAX8998_REG_LDO2_LDO3;
+ mask = 0xf;
+ if (ldo == MAX8998_LDO2)
+ shift = 4;
+ else
+ shift = 0;
+ break;
+ case MAX8998_LDO4 ... MAX8998_LDO7:
+ reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
+ break;
+ case MAX8998_LDO8 ... MAX8998_LDO9:
+ reg = MAX8998_REG_LDO8_LDO9;
+ mask = 0xf;
+ if (ldo == MAX8998_LDO8)
+ shift = 4;
+ else
+ shift = 0;
+ break;
+ case MAX8998_LDO10 ... MAX8998_LDO11:
+ reg = MAX8998_REG_LDO10_LDO11;
+ if (ldo == MAX8998_LDO10) {
+ shift = 5;
+ mask = 0x7;
+ } else {
+ shift = 0;
+ mask = 0x1f;
+ }
+ break;
+ case MAX8998_LDO12 ... MAX8998_LDO17:
+ reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
+ break;
+ case MAX8998_BUCK1:
+ reg = MAX8998_REG_BUCK1_DVSARM1;
+ break;
+ case MAX8998_BUCK2:
+ reg = MAX8998_REG_BUCK2_DVSINT1;
+ break;
+ case MAX8998_BUCK3:
+ reg = MAX8998_REG_BUCK3;
+ break;
+ case MAX8998_BUCK4:
+ reg = MAX8998_REG_BUCK4;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ *_reg = reg;
+ *_shift = shift;
+ *_mask = mask;
+
+ return 0;
+}
+
+static int max8998_get_voltage(struct regulator_dev *rdev)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int reg, shift = 0, mask, ret;
+ u8 val;
+
+ ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
+ if (ret)
+ return ret;
+
+ ret = max8998_read_reg(max8998->iodev, reg, &val);
+ if (ret)
+ return ret;
+
+ val >>= shift;
+ val &= mask;
+
+ return max8998_list_voltage(rdev, val);
+}
+
+static int max8998_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV)
+{
+ struct max8998_data *max8998 = rdev_get_drvdata(rdev);
+ int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+ const struct voltage_map_desc *desc;
+ int ldo = max8998_get_ldo(rdev);
+ int reg, shift = 0, mask, ret;
+ int i = 0;
+
+ if (ldo > ARRAY_SIZE(ldo_voltage_map))
+ return -EINVAL;
+
+ desc = ldo_voltage_map[ldo];
+ if (desc == NULL)
+ return -EINVAL;
+
+ if (max_vol < desc->min || min_vol > desc->max)
+ return -EINVAL;
+
+ while (desc->min + desc->step*i < max_vol &&
+ desc->min + desc->step*i < desc->max)
+ i++;
+
+ ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
+ if (ret)
+ return ret;
+
+ return max8998_update_reg(max8998->iodev, reg, i<<shift, mask<<shift);
+}
+
+static struct regulator_ops max8998_ldo_ops = {
+ .list_voltage = max8998_list_voltage,
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+ .get_voltage = max8998_get_voltage,
+ .set_voltage = max8998_set_voltage,
+ .set_suspend_enable = max8998_ldo_enable,
+ .set_suspend_disable = max8998_ldo_disable,
+};
+
+static struct regulator_ops max8998_buck_ops = {
+ .list_voltage = max8998_list_voltage,
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+ .get_voltage = max8998_get_voltage,
+ .set_voltage = max8998_set_voltage,
+ .set_suspend_enable = max8998_ldo_enable,
+ .set_suspend_disable = max8998_ldo_disable,
+};
+
+static struct regulator_ops max8998_others_ops = {
+ .is_enabled = max8998_ldo_is_enabled,
+ .enable = max8998_ldo_enable,
+ .disable = max8998_ldo_disable,
+ .set_suspend_enable = max8998_ldo_enable,
+ .set_suspend_disable = max8998_ldo_disable,
+};
+
+static struct regulator_desc regulators[] = {
+ {
+ .name = "LDO2",
+ .id = MAX8998_LDO2,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO3",
+ .id = MAX8998_LDO3,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO4",
+ .id = MAX8998_LDO4,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO5",
+ .id = MAX8998_LDO5,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO6",
+ .id = MAX8998_LDO6,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO7",
+ .id = MAX8998_LDO7,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO8",
+ .id = MAX8998_LDO8,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO9",
+ .id = MAX8998_LDO9,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO10",
+ .id = MAX8998_LDO10,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO11",
+ .id = MAX8998_LDO11,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO12",
+ .id = MAX8998_LDO12,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO13",
+ .id = MAX8998_LDO13,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO14",
+ .id = MAX8998_LDO14,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO15",
+ .id = MAX8998_LDO15,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO16",
+ .id = MAX8998_LDO16,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "LDO17",
+ .id = MAX8998_LDO17,
+ .ops = &max8998_ldo_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK1",
+ .id = MAX8998_BUCK1,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK2",
+ .id = MAX8998_BUCK2,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK3",
+ .id = MAX8998_BUCK3,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "BUCK4",
+ .id = MAX8998_BUCK4,
+ .ops = &max8998_buck_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz AP",
+ .id = MAX8998_EN32KHZ_AP,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz CP",
+ .id = MAX8998_EN32KHZ_CP,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ENVICHG",
+ .id = MAX8998_ENVICHG,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ESAFEOUT1",
+ .id = MAX8998_ESAFEOUT1,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "ESAFEOUT2",
+ .id = MAX8998_ESAFEOUT2,
+ .ops = &max8998_others_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }
+};
+
+static __devinit int max8998_pmic_probe(struct platform_device *pdev)
+{
+ struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
+ struct regulator_dev **rdev;
+ struct max8998_data *max8998;
+ int i, ret, size;
+
+ if (!pdata) {
+ dev_err(pdev->dev.parent, "No platform init data supplied\n");
+ return -ENODEV;
+ }
+
+ max8998 = kzalloc(sizeof(struct max8998_data), GFP_KERNEL);
+ if (!max8998)
+ return -ENOMEM;
+
+ size = sizeof(struct regulator_dev *) * (pdata->num_regulators + 1);
+ max8998->rdev = kzalloc(size, GFP_KERNEL);
+ if (!max8998->rdev) {
+ kfree(max8998);
+ return -ENOMEM;
+ }
+
+ rdev = max8998->rdev;
+ max8998->iodev = iodev;
+ platform_set_drvdata(pdev, max8998);
+
+ for (i = 0; i < pdata->num_regulators; i++) {
+ const struct voltage_map_desc *desc;
+ int id = pdata->regulators[i].id;
+ int index = id - MAX8998_LDO2;
+
+ desc = ldo_voltage_map[id];
+ if (desc && regulators[index].ops != &max8998_others_ops) {
+ int count = (desc->max - desc->min) / desc->step + 1;
+ regulators[index].n_voltages = count;
+ }
+ rdev[i] = regulator_register(®ulators[index], max8998->dev,
+ pdata->regulators[i].initdata, max8998);
+ if (IS_ERR(rdev[i])) {
+ ret = PTR_ERR(rdev[i]);
+ dev_err(max8998->dev, "regulator init failed\n");
+ rdev[i] = NULL;
+ goto err;
+ }
+ }
+
+
+ return 0;
+err:
+ for (i = 0; i <= max8998->num_regulators; i++)
+ if (rdev[i])
+ regulator_unregister(rdev[i]);
+
+ kfree(max8998->rdev);
+ kfree(max8998);
+
+ return ret;
+}
+
+static int __devexit max8998_pmic_remove(struct platform_device *pdev)
+{
+ struct max8998_data *max8998 = platform_get_drvdata(pdev);
+ struct regulator_dev **rdev = max8998->rdev;
+ int i;
+
+ for (i = 0; i <= max8998->num_regulators; i++)
+ if (rdev[i])
+ regulator_unregister(rdev[i]);
+
+ kfree(max8998->rdev);
+ kfree(max8998);
+
+ return 0;
+}
+
+static struct platform_driver max8998_pmic_driver = {
+ .driver = {
+ .name = "max8998-pmic",
+ .owner = THIS_MODULE,
+ },
+ .probe = max8998_pmic_probe,
+ .remove = __devexit_p(max8998_pmic_remove),
+};
+
+static int __init max8998_pmic_init(void)
+{
+ return platform_driver_register(&max8998_pmic_driver);
+}
+subsys_initcall(max8998_pmic_init);
+
+static void __exit max8998_pmic_cleanup(void)
+{
+ platform_driver_unregister(&max8998_pmic_driver);
+}
+module_exit(max8998_pmic_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_LICENSE("GPL");