regulator: max77693: Add max77693 regualtor driver.
authorJonghwa Lee <jonghwa3.lee@samsung.com>
Tue, 25 Jun 2013 01:08:38 +0000 (10:08 +0900)
committerMark Brown <broonie@linaro.org>
Tue, 25 Jun 2013 10:31:29 +0000 (11:31 +0100)
This patch adds new regulator driver to support max77693 chip's regulators.
max77693 has two linear voltage regulators and one current regulator which
can be controlled through I2C bus. This driver also supports device tree.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Documentation/devicetree/bindings/mfd/max77693.txt [new file with mode: 0644]
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/max77693.c [new file with mode: 0644]
include/linux/mfd/max77693-private.h
include/linux/mfd/max77693.h

diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
new file mode 100644 (file)
index 0000000..11921cc
--- /dev/null
@@ -0,0 +1,55 @@
+Maxim MAX77693 multi-function device
+
+MAX77693 is a Multifunction device with the following submodules:
+- PMIC,
+- CHARGER,
+- LED,
+- MUIC,
+- HAPTIC
+
+It is interfaced to host controller using i2c.
+This document describes the bindings for the mfd device.
+
+Required properties:
+- compatible : Must be "maxim,max77693".
+- reg : Specifies the i2c slave address of PMIC block.
+- interrupts : This i2c device has an IRQ line connected to the main SoC.
+- interrupt-parent :  The parent interrupt controller.
+
+Optional properties:
+- regulators : The regulators of max77693 have to be instantiated under subnod
+  named "regulators" using the following format.
+
+       regulators {
+               regualtor-compatible = ESAFEOUT1/ESAFEOUT2/CHARGER
+               standard regulator constratints[*].
+       };
+
+       [*] refer Documentation/devicetree/bindings/regulator/regulator.txt
+
+Example:
+       max77693@66 {
+               compatible = "maxim,max77693";
+               reg = <0x66>;
+               interrupt-parent = <&gpx1>;
+               interrupts = <5 2>;
+
+               regulators {
+                       esafeout@1 {
+                               regulator-compatible = "ESAFEOUT1";
+                               regulator-name = "ESAFEOUT1";
+                               regulator-boot-on;
+                       };
+                       esafeout@2 {
+                               regulator-compatible = "ESAFEOUT2";
+                               regulator-name = "ESAFEOUT2";
+                               };
+                       charger@0 {
+                               regulator-compatible = "CHARGER";
+                               regulator-name = "CHARGER";
+                               regulator-min-microamp = <60000>;
+                               regulator-max-microamp = <2580000>;
+                                       regulator-boot-on;
+                       };
+               };
+       };
index 8bb26446037e297ff974200bf3c81e993ff62a47..9744437afe32424e5a86eff4b0810f61c35dff9e 100644 (file)
@@ -250,6 +250,15 @@ config REGULATOR_MAX77686
          via I2C bus. The provided regulator is suitable for
          Exynos-4 chips to control VARM and VINT voltages.
 
+config REGULATOR_MAX77693
+       tristate "Maxim MAX77693 regulator"
+       depends on MFD_MAX77693
+       help
+         This driver controls a Maxim 77693 regulator via I2C bus.
+         The regulators include two LDOs, 'SAFEOUT1', 'SAFEOUT2'
+         and one current regulator 'CHARGER'. This is suitable for
+         Exynos-4x12 chips.
+
 config REGULATOR_PCAP
        tristate "Motorola PCAP2 regulator driver"
        depends on EZX_PCAP
index 47a34ff88f981e6f0c96012940bbf24597a47c22..a4094cd274be56e54e36a3ca82b00f13904e2870 100644 (file)
@@ -41,6 +41,7 @@ obj-$(CONFIG_REGULATOR_MAX8973) += max8973-regulator.o
 obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
 obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
 obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
+obj-$(CONFIG_REGULATOR_MAX77693) += max77693.o
 obj-$(CONFIG_REGULATOR_MC13783) += mc13783-regulator.o
 obj-$(CONFIG_REGULATOR_MC13892) += mc13892-regulator.o
 obj-$(CONFIG_REGULATOR_MC13XXX_CORE) +=  mc13xxx-regulator-core.o
diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
new file mode 100644 (file)
index 0000000..674ece7
--- /dev/null
@@ -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");
index 1aa4f13cdfa6a4f2b0ceec56a689600f8d53626c..244fb0d51589ffc9d92ed440bed1cb8f56084ae0 100644 (file)
@@ -85,6 +85,19 @@ enum max77693_pmic_reg {
        MAX77693_PMIC_REG_END,
 };
 
+/* MAX77693 CHG_CNFG_00 register */
+#define CHG_CNFG_00_CHG_MASK           0x1
+#define CHG_CNFG_00_BUCK_MASK          0x4
+
+/* MAX77693 CHG_CNFG_09 Register */
+#define CHG_CNFG_09_CHGIN_ILIM_MASK    0x7F
+
+/* MAX77693 CHG_CTRL Register */
+#define SAFEOUT_CTRL_SAFEOUT1_MASK     0x3
+#define SAFEOUT_CTRL_SAFEOUT2_MASK     0xC
+#define SAFEOUT_CTRL_ENSAFEOUT1_MASK   0x40
+#define SAFEOUT_CTRL_ENSAFEOUT2_MASK   0x80
+
 /* Slave addr = 0x4A: MUIC */
 enum max77693_muic_reg {
        MAX77693_MUIC_REG_ID            = 0x00,
index 3109a6c5c9489ff0d4b4615c081d823e88c2238a..676f0f388992410fe0b7ac918a08bfe992d1ca91 100644 (file)
 #ifndef __LINUX_MFD_MAX77693_H
 #define __LINUX_MFD_MAX77693_H
 
+/* MAX77686 regulator IDs */
+enum max77693_regulators {
+       MAX77693_ESAFEOUT1 = 0,
+       MAX77693_ESAFEOUT2,
+       MAX77693_CHARGER,
+       MAX77693_REG_MAX,
+};
+
+struct max77693_regulator_data {
+       int id;
+       struct regulator_init_data *initdata;
+       struct device_node *of_node;
+};
+
 struct max77693_reg_data {
        u8 addr;
        u8 data;
@@ -52,6 +66,10 @@ struct max77693_muic_platform_data {
 struct max77693_platform_data {
        int wakeup;
 
+       /* regulator data */
+       struct max77693_regulator_data *regulators;
+       int num_regulators;
+
        /* muic data */
        struct max77693_muic_platform_data *muic_data;
 };