[PATCH 2/3] regulator: MAX77686: Add Maxim 77686 regulator driver

From: Jonghwa Lee
Date: Fri May 18 2012 - 05:32:38 EST

Add driver for support max77686 regulator.
MAX77686 provides LDOs[1~26] and BUCKs[1~9]. It support to set or get the
volatege of regulator on max77686 chip with using regmap.

v2
- Convert get_voltage to get_voltage_sel
- Convert set_voltage to set_voltage_sel
- Implement set_voltage_time_sel
- Register regulators unconditionally
- kzalloc -> devm_kzalloc
- Remove unneccessary printk
- Keep probing whether pdata exists or not
- Use regmap API to access PMIC register.

Signed-off-by: Chiwoong Byun <woong.byun@xxxxxxxxxxx>
Signed-off-by: Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
Signed-off-by: Myungjoo Ham <myungjoo.ham@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/max77686.c | 791 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 800 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/max77686.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 36db5a4..8e2ebad 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -195,6 +195,14 @@ config REGULATOR_MAX8998
via I2C bus. The provided regulator is suitable for S3C6410
and S5PC1XX chips to control VCC_CORE and VCC_USIM voltages.

+config REGULATOR_MAX77686
+ tristate "Maxim 77686 regulator"
+ depends on MFD_MAX77686
+ help
+ This driver controls a Maxim 77686 regulator
+ via I2C bus. The provided regulator is suitable for
+ Exynos-4 chips to control VARM and VINT voltages.
+
config REGULATOR_PCAP
tristate "Motorola PCAP2 regulator driver"
depends on EZX_PCAP
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 94b5274..008931b 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_REGULATOR_MAX8925) += max8925-regulator.o
obj-$(CONFIG_REGULATOR_MAX8952) += max8952.o
obj-$(CONFIG_REGULATOR_MAX8997) += max8997.o
obj-$(CONFIG_REGULATOR_MAX8998) += max8998.o
+obj-$(CONFIG_REGULATOR_MAX77686) += max77686.o
obj-$(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/max77686.c b/drivers/regulator/max77686.c
new file mode 100644
index 0000000..8bfd061
--- /dev/null
+++ b/drivers/regulator/max77686.c
@@ -0,0 +1,791 @@
+/*
+ * max77686.c - Regulator driver for the Maxim 77686
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * Chiwoong Byun <woong.byun@xxxxxxxxxxx>
+ * Jonghwa Lee <jonghwa3.lee@xxxxxxxxxxx>
+ *
+ * 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 max8997.c
+ */
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/bug.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77686.h>
+#include <linux/mfd/max77686-private.h>
+
+#define PMIC_DEBUG KERN_INFO
+#define PMIC_REG_DEBUG KERN_DEBUG
+
+#define MAX77686_OPMODE_SHIFT 6
+#define MAX77686_OPMODE_BUCK234_SHIFT 4
+#define MAX77686_OPMODE_MASK 0x3
+
+#define MAX77686_RAMP_RATE 100
+
+#define MAX77686_REGULATORS 38
+
+struct max77686_data {
+ struct device *dev;
+ struct max77686_dev *iodev;
+ int num_regulators;
+ struct regulator_dev **rdev;
+ int ramp_delay; /* in mV/us */
+
+ struct max77686_opmode_data *opmode_data;
+
+ bool buck2_gpiodvs;
+ bool buck3_gpiodvs;
+ bool buck4_gpiodvs;
+ u8 buck2_vol[8];
+ u8 buck3_vol[8];
+ u8 buck4_vol[8];
+ int buck234_gpios_dvs[3];
+ int buck234_gpios_selb[3];
+ int buck234_gpioindex;
+ bool ignore_gpiodvs_side_effect;
+
+ u8 saved_states[MAX77686_REG_MAX];
+};
+
+static inline void max77686_set_gpio(struct max77686_data *max77686)
+{
+ int set3 = (max77686->buck234_gpioindex) & 0x1;
+ int set2 = ((max77686->buck234_gpioindex) >> 1) & 0x1;
+ int set1 = ((max77686->buck234_gpioindex) >> 2) & 0x1;
+
+ if (max77686->buck234_gpios_dvs[0])
+ gpio_set_value(max77686->buck234_gpios_dvs[0], set1);
+ if (max77686->buck234_gpios_dvs[1])
+ gpio_set_value(max77686->buck234_gpios_dvs[1], set2);
+ if (max77686->buck234_gpios_dvs[2])
+ gpio_set_value(max77686->buck234_gpios_dvs[2], set3);
+}
+
+struct voltage_map_desc {
+ int min;
+ int max;
+ int step;
+ unsigned int n_bits;
+};
+
+/* LDO3 ~ 5, 9 ~ 14, 16 ~ 26 (uV) */
+static const struct voltage_map_desc ldo_voltage_map_desc = {
+ .min = 800000, .max = 3950000, .step = 50000, .n_bits = 6,
+};
+
+/* LDO1 ~ 2, 6 ~ 8, 15 (uV) */
+static const struct voltage_map_desc ldo_low_voltage_map_desc = {
+ .min = 800000, .max = 2375000, .step = 25000, .n_bits = 6,
+};
+
+/* Buck2, 3, 4 (uV) */
+static const struct voltage_map_desc buck_dvs_voltage_map_desc = {
+ .min = 600000, .max = 3787500, .step = 12500, .n_bits = 8,
+};
+
+/* Buck1, 5 ~ 9 (uV) */
+static const struct voltage_map_desc buck_voltage_map_desc = {
+ .min = 750000, .max = 3900000, .step = 50000, .n_bits = 6,
+};
+
+static const struct voltage_map_desc *reg_voltage_map[] = {
+ [MAX77686_LDO1] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO2] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO3] = &ldo_voltage_map_desc,
+ [MAX77686_LDO4] = &ldo_voltage_map_desc,
+ [MAX77686_LDO5] = &ldo_voltage_map_desc,
+ [MAX77686_LDO6] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO7] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO8] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO9] = &ldo_voltage_map_desc,
+ [MAX77686_LDO10] = &ldo_voltage_map_desc,
+ [MAX77686_LDO11] = &ldo_voltage_map_desc,
+ [MAX77686_LDO12] = &ldo_voltage_map_desc,
+ [MAX77686_LDO13] = &ldo_voltage_map_desc,
+ [MAX77686_LDO14] = &ldo_voltage_map_desc,
+ [MAX77686_LDO15] = &ldo_low_voltage_map_desc,
+ [MAX77686_LDO16] = &ldo_voltage_map_desc,
+ [MAX77686_LDO17] = &ldo_voltage_map_desc,
+ [MAX77686_LDO18] = &ldo_voltage_map_desc,
+ [MAX77686_LDO19] = &ldo_voltage_map_desc,
+ [MAX77686_LDO20] = &ldo_voltage_map_desc,
+ [MAX77686_LDO21] = &ldo_voltage_map_desc,
+ [MAX77686_LDO22] = &ldo_voltage_map_desc,
+ [MAX77686_LDO23] = &ldo_voltage_map_desc,
+ [MAX77686_LDO24] = &ldo_voltage_map_desc,
+ [MAX77686_LDO25] = &ldo_voltage_map_desc,
+ [MAX77686_LDO26] = &ldo_voltage_map_desc,
+ [MAX77686_BUCK1] = &buck_voltage_map_desc,
+ [MAX77686_BUCK2] = &buck_dvs_voltage_map_desc,
+ [MAX77686_BUCK3] = &buck_dvs_voltage_map_desc,
+ [MAX77686_BUCK4] = &buck_dvs_voltage_map_desc,
+ [MAX77686_BUCK5] = &buck_voltage_map_desc,
+ [MAX77686_BUCK6] = &buck_voltage_map_desc,
+ [MAX77686_BUCK7] = &buck_voltage_map_desc,
+ [MAX77686_BUCK8] = &buck_voltage_map_desc,
+ [MAX77686_BUCK9] = &buck_voltage_map_desc,
+ [MAX77686_EN32KHZ_AP] = NULL,
+ [MAX77686_EN32KHZ_CP] = NULL,
+ [MAX77686_P32KH] = NULL,
+};
+
+static int max77686_list_voltage(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ const struct voltage_map_desc *desc;
+ int rid = rdev_get_id(rdev);
+ int val;
+
+ if (rid >= ARRAY_SIZE(reg_voltage_map) ||
+ rid < 0)
+ return -EINVAL;
+
+ desc = reg_voltage_map[rid];
+ if (desc == NULL)
+ return -EINVAL;
+
+ val = desc->min + desc->step * selector;
+ if (val > desc->max)
+ return -EINVAL;
+
+ return val;
+}
+
+unsigned int max77686_opmode_reg[][3] = {
+ /* LDO1 ... LDO26 */
+ /* {NORMAL, LP, STANDBY} */
+ {0x3, 0x2, 0x2}, /* LDO1 */
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1}, /* LDO11 */
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2}, /* LDO21 */
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ {0x3, 0x2, 0x2},
+ /* BUCK1 ... BUCK9 */
+ {0x3, 0x2, 0x1}, /* BUCK1 */
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x2, 0x1},
+ {0x3, 0x3, 0x3},
+ {0x3, 0x3, 0x3},
+ {0x3, 0x3, 0x3},
+ {0x3, 0x3, 0x3},
+ {0x3, 0x3, 0x3},
+ /* 32KHZ */
+ {0x1, 0x1, 0x1},
+ {0x1, 0x1, 0x1},
+ {0x1, 0x1, 0x1},
+};
+
+static int max77686_get_enable_register(struct regulator_dev *rdev,
+ int *reg, int *mask, int *pattern)
+{
+ unsigned int rid = rdev_get_id(rdev);
+ unsigned int mode;
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+
+ if (rid > ARRAY_SIZE(max77686_opmode_reg))
+ return -EINVAL;
+
+ mode = max77686->opmode_data[rid].mode;
+ printk(KERN_INFO "rid=%d, mode=%d, size=%d\n",
+ rid, mode, ARRAY_SIZE(max77686_opmode_reg));
+
+ switch (rid) {
+ case MAX77686_LDO1 ... MAX77686_LDO26:
+ *reg = MAX77686_REG_LDO1CTRL1 + (rid - MAX77686_LDO1);
+ *mask = MAX77686_OPMODE_MASK << MAX77686_OPMODE_SHIFT;
+ *pattern = max77686_opmode_reg[rid][mode]
+ << MAX77686_OPMODE_SHIFT;
+ break;
+ case MAX77686_BUCK1:
+ *reg = MAX77686_REG_BUCK1CTRL;
+ *mask = MAX77686_OPMODE_MASK;
+ *pattern = max77686_opmode_reg[rid][mode];
+ break;
+ case MAX77686_BUCK2:
+ case MAX77686_BUCK3:
+ case MAX77686_BUCK4:
+ *reg = MAX77686_REG_BUCK2CTRL1 + (rid - MAX77686_BUCK2)*10;
+ *mask = MAX77686_OPMODE_MASK << MAX77686_OPMODE_BUCK234_SHIFT;
+ *pattern = max77686_opmode_reg[rid][mode]
+ << MAX77686_OPMODE_BUCK234_SHIFT;
+ break;
+ case MAX77686_BUCK5 ... MAX77686_BUCK9:
+ *reg = MAX77686_REG_BUCK5CTRL + (rid - MAX77686_BUCK5) * 2;
+ *mask = MAX77686_OPMODE_MASK;
+ *pattern = max77686_opmode_reg[rid][mode];
+ break;
+ case MAX77686_EN32KHZ_AP ... MAX77686_P32KH:
+ *reg = MAX77686_REG_32KHZ;
+ *mask = 0x01 << (rid - MAX77686_EN32KHZ_AP);
+ *pattern = 0x01 << (rid - MAX77686_EN32KHZ_AP);
+ break;
+ default:
+ /* Not controllable or not exists */
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max77686_reg_is_enabled(struct regulator_dev *rdev)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int ret, reg, mask, pattern;
+ unsigned int val;
+
+ ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(max77686->iodev->regmap, reg, &val);
+
+ if (ret)
+ return ret;
+
+ printk(PMIC_DEBUG "id=%d, ret=%d, val=%x, mask=%x, pattern=%x\n",
+ rdev_get_id(rdev), (val & mask) == pattern,
+ val, mask, pattern);
+
+ return (val & mask) == pattern;
+}
+
+static int max77686_reg_enable(struct regulator_dev *rdev)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int ret, reg, mask, pattern;
+
+ ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+ if (ret < 0)
+ return ret;
+
+ printk(PMIC_DEBUG "%s: id=%d, pattern=%x\n",
+ __func__, rdev_get_id(rdev), pattern);
+
+ return regmap_update_bits(max77686->iodev->regmap, reg, mask, pattern);
+}
+
+static int max77686_reg_disable(struct regulator_dev *rdev)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int ret, reg, mask, pattern;
+
+ ret = max77686_get_enable_register(rdev, &reg, &mask, &pattern);
+ if (ret < 0)
+ return ret;
+
+ printk(PMIC_DEBUG "%s: id=%d, pattern=%x\n",
+ __func__, rdev_get_id(rdev), pattern);
+
+ return regmap_update_bits(max77686->iodev->regmap, reg, mask, ~mask);
+}
+
+static int max77686_get_voltage_register(struct regulator_dev *rdev,
+ int *_reg, int *_shift, int *_mask)
+{
+ int rid = rdev_get_id(rdev);
+ int reg, shift = 0, mask = 0x3f;
+
+ switch (rid) {
+ case MAX77686_LDO1 ... MAX77686_LDO26:
+ reg = MAX77686_REG_LDO1CTRL1 + (rid - MAX77686_LDO1);
+ break;
+ case MAX77686_BUCK1:
+ reg = MAX77686_REG_BUCK1OUT;
+ break;
+ case MAX77686_BUCK2:
+ reg = MAX77686_REG_BUCK2DVS1;
+ mask = 0xff;
+ break;
+ case MAX77686_BUCK3:
+ reg = MAX77686_REG_BUCK3DVS1;
+ mask = 0xff;
+ break;
+ case MAX77686_BUCK4:
+ reg = MAX77686_REG_BUCK4DVS1;
+ mask = 0xff;
+ break;
+ case MAX77686_BUCK5 ... MAX77686_BUCK9:
+ reg = MAX77686_REG_BUCK5OUT + (rid - MAX77686_BUCK5) * 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ *_reg = reg;
+ *_shift = shift;
+ *_mask = mask;
+
+ return 0;
+}
+
+static inline int max77686_get_voltage_proper_val(
+ const struct voltage_map_desc *desc,
+ int min_vol, int max_vol)
+{
+ int i = 0;
+
+ if (desc == NULL)
+ return -EINVAL;
+
+ if (max_vol < desc->min || min_vol > desc->max)
+ return -EINVAL;
+
+ while (desc->min + desc->step * i < min_vol &&
+ desc->min + desc->step * i < desc->max)
+ i++;
+
+ if (desc->min + desc->step * i > max_vol)
+ return -EINVAL;
+
+ if (i >= (1 << desc->n_bits))
+ return -EINVAL;
+
+ return i;
+}
+
+static int max77686_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int reg, shift, mask, ret;
+ int rid = rdev_get_id(rdev);
+ unsigned int selector;
+
+ ret = max77686_get_voltage_register(rdev, &reg, &shift, &mask);
+ if (ret)
+ return ret;
+
+ if ((rid == MAX77686_BUCK2 && max77686->buck2_gpiodvs) ||
+ (rid == MAX77686_BUCK3 && max77686->buck3_gpiodvs) ||
+ (rid == MAX77686_BUCK4 && max77686->buck4_gpiodvs))
+ reg += max77686->buck234_gpioindex;
+
+ ret = regmap_read(max77686->iodev->regmap, reg, &selector);
+ if (ret)
+ return ret;
+
+ selector >>= shift;
+ selector &= mask;
+
+ return selector;
+}
+
+static int max77686_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ int reg, shift, mask, ret;
+
+ ret = max77686_get_voltage_register(rdev, &reg, &shift, &mask);
+ if (ret)
+ return ret;
+
+ ret = regmap_update_bits(max77686->iodev->regmap, reg,
+ mask << shift, selector << shift);
+
+ return ret;
+}
+
+static int max77686_set_voltage_time_sel(struct regulator_dev *rdev,
+ unsigned int old_selector, unsigned int new_selector)
+{
+ struct max77686_data *max77686 = rdev_get_drvdata(rdev);
+ const struct voltage_map_desc *desc;
+ int rid = rdev_get_id(rdev);
+
+ desc = reg_voltage_map[rid];
+
+ switch (rid) {
+ case MAX77686_BUCK2 ... MAX77686_BUCK4:
+ if (old_selector < new_selector)
+ return (DIV_ROUND_UP(desc->step
+ * (new_selector - old_selector),
+ max77686->ramp_delay * 1000));
+ case MAX77686_BUCK1:
+ case MAX77686_BUCK5 ... MAX77686_BUCK9:
+ /* Unconditionally 100 mV/us */
+ if (old_selector < new_selector)
+ return (DIV_ROUND_UP(desc->step
+ * (new_selector - old_selector), 100000));
+ default:
+ return 0;
+ }
+}
+
+static struct regulator_ops max77686_ldo_ops = {
+ .list_voltage = max77686_list_voltage,
+ .is_enabled = max77686_reg_is_enabled,
+ .enable = max77686_reg_enable,
+ .disable = max77686_reg_disable,
+ .get_voltage_sel = max77686_get_voltage_sel,
+ .set_voltage_sel = max77686_set_voltage_sel,
+ .set_voltage_time_sel = max77686_set_voltage_time_sel,
+};
+
+static struct regulator_ops max77686_buck_ops = {
+ .list_voltage = max77686_list_voltage,
+ .is_enabled = max77686_reg_is_enabled,
+ .enable = max77686_reg_enable,
+ .disable = max77686_reg_disable,
+ .get_voltage_sel = max77686_get_voltage_sel,
+ .set_voltage_sel = max77686_set_voltage_sel,
+ .set_voltage_time_sel = max77686_set_voltage_time_sel,
+};
+
+static struct regulator_ops max77686_fixedvolt_ops = {
+ .list_voltage = max77686_list_voltage,
+ .is_enabled = max77686_reg_is_enabled,
+ .enable = max77686_reg_enable,
+ .disable = max77686_reg_disable,
+};
+
+#define regulator_desc_ldo(num) { \
+ .name = "LDO"#num, \
+ .id = MAX77686_LDO##num, \
+ .ops = &max77686_ldo_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+}
+#define regulator_desc_buck(num) { \
+ .name = "BUCK"#num, \
+ .id = MAX77686_BUCK##num, \
+ .ops = &max77686_buck_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+}
+
+static struct regulator_desc regulators[] = {
+ regulator_desc_ldo(1),
+ regulator_desc_ldo(2),
+ regulator_desc_ldo(3),
+ regulator_desc_ldo(4),
+ regulator_desc_ldo(5),
+ regulator_desc_ldo(6),
+ regulator_desc_ldo(7),
+ regulator_desc_ldo(8),
+ regulator_desc_ldo(9),
+ regulator_desc_ldo(10),
+ regulator_desc_ldo(11),
+ regulator_desc_ldo(12),
+ regulator_desc_ldo(13),
+ regulator_desc_ldo(14),
+ regulator_desc_ldo(15),
+ regulator_desc_ldo(16),
+ regulator_desc_ldo(17),
+ regulator_desc_ldo(18),
+ regulator_desc_ldo(19),
+ regulator_desc_ldo(20),
+ regulator_desc_ldo(21),
+ regulator_desc_ldo(22),
+ regulator_desc_ldo(23),
+ regulator_desc_ldo(24),
+ regulator_desc_ldo(25),
+ regulator_desc_ldo(26),
+ regulator_desc_buck(1),
+ regulator_desc_buck(2),
+ regulator_desc_buck(3),
+ regulator_desc_buck(4),
+ regulator_desc_buck(5),
+ regulator_desc_buck(6),
+ regulator_desc_buck(7),
+ regulator_desc_buck(8),
+ regulator_desc_buck(9),
+ {
+ .name = "EN32KHz AP",
+ .id = MAX77686_EN32KHZ_AP,
+ .ops = &max77686_fixedvolt_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz CP",
+ .id = MAX77686_EN32KHZ_CP,
+ .ops = &max77686_fixedvolt_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ }, {
+ .name = "EN32KHz PMIC",
+ .id = MAX77686_P32KH,
+ .ops = &max77686_fixedvolt_ops,
+ .type = REGULATOR_VOLTAGE,
+ .owner = THIS_MODULE,
+ },
+};
+
+static __devinit int max77686_pmic_probe(struct platform_device *pdev)
+{
+ struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+ struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
+ struct regulator_dev **rdev;
+ struct max77686_data *max77686;
+ struct i2c_client *i2c;
+ struct regulator_init_data **init_data;
+ int i, ret, size;
+ unsigned int data = 0;
+
+ printk(PMIC_DEBUG "%s\n", __func__);
+
+ if (!pdata)
+ dev_err(pdev->dev.parent, "No platform init data supplied.\n");
+
+ max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
+ GFP_KERNEL);
+ if (!max77686)
+ return -ENOMEM;
+
+ size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS;
+ max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+ if (!max77686->rdev) {
+ devm_kfree(&pdev->dev, max77686);
+ return -ENOMEM;
+ }
+
+ rdev = max77686->rdev;
+ max77686->dev = &pdev->dev;
+ max77686->iodev = iodev;
+ if (pdata)
+ max77686->num_regulators = pdata->num_regulators;
+ platform_set_drvdata(pdev, max77686);
+ i2c = max77686->iodev->i2c;
+ init_data = devm_kzalloc(&pdev->dev,
+ sizeof(struct regulator_init_data *)
+ * MAX77686_REGULATORS, GFP_KERNEL);
+ if (pdata)
+ max77686->opmode_data = pdata->opmode_data;
+
+ max77686->ramp_delay = MAX77686_RAMP_RATE; /* Set 0x3 for RAMP */
+ regmap_update_bits(max77686->iodev->regmap,
+ MAX77686_REG_BUCK2CTRL1, 0xC0, 0xC0);
+ regmap_update_bits(max77686->iodev->regmap,
+ MAX77686_REG_BUCK3CTRL1, 0xC0, 0xC0);
+ regmap_update_bits(max77686->iodev->regmap,
+ MAX77686_REG_BUCK4CTRL1, 0xC0, 0xC0);
+
+ regmap_read(max77686->iodev->regmap, MAX77686_REG_DEVICE_ID, &data);
+
+ /*
+ * TODO
+ * This disables GPIO-DVS. Later we may need to implement GPIO-DVS..
+ * or we do not?
+ */
+ max77686->buck2_gpiodvs = false;
+ max77686->buck3_gpiodvs = false;
+ max77686->buck4_gpiodvs = false;
+ if (pdata) {
+ for (i = 0; i < 3; i++) {
+ char buf[80];
+ sprintf(buf, "MAX77686 DVS%d", i);
+ if (gpio_is_valid(pdata->buck234_gpio_dvs[i])) {
+ max77686->buck234_gpios_dvs[i] =
+ pdata->buck234_gpio_dvs[i];
+ gpio_request(pdata->buck234_gpio_dvs[i], buf);
+ gpio_direction_output(
+ pdata->buck234_gpio_dvs[i], 0);
+ } else {
+ dev_info(&pdev->dev, "GPIO %s ignored (%d)\n",
+ buf, pdata->buck234_gpio_dvs[i]);
+ }
+
+ sprintf(buf, "MAX77686 SELB%d", i);
+
+ if (gpio_is_valid(pdata->buck234_gpio_selb[i])) {
+ max77686->buck234_gpios_selb[i] =
+ pdata->buck234_gpio_selb[i];
+ gpio_request(pdata->buck234_gpio_selb[i], buf);
+ gpio_direction_output(
+ pdata->buck234_gpio_selb[i], 0);
+ } else {
+ dev_info(&pdev->dev, "GPIO %s ignored (%d)\n",
+ buf, pdata->buck234_gpio_dvs[i]);
+ }
+ }
+ }
+
+ max77686->buck234_gpioindex = 0;
+ for (i = 0; i < 8; i++) {
+ if (pdata)
+ ret = max77686_get_voltage_proper_val(
+ &buck_dvs_voltage_map_desc,
+ pdata->buck2_voltage[i],
+ pdata->buck2_voltage[i]
+ + buck_dvs_voltage_map_desc.step);
+ /* 1.1V as default for safety */
+ if (!pdata || ret < 0)
+ max77686->buck2_vol[i] = 0x28;
+ else
+ max77686->buck2_vol[i] = ret;
+
+ regmap_write(max77686->iodev->regmap,
+ MAX77686_REG_BUCK2DVS1 + i, max77686->buck2_vol[i]);
+ if (pdata)
+ ret = max77686_get_voltage_proper_val(
+ &buck_dvs_voltage_map_desc,
+ pdata->buck3_voltage[i],
+ pdata->buck3_voltage[i]
+ + buck_dvs_voltage_map_desc.step);
+ /* 1.1V as default for safety */
+ if (!pdata || ret < 0)
+ max77686->buck3_vol[i] = 0x28;
+ else
+ max77686->buck3_vol[i] = ret;
+
+ regmap_write(max77686->iodev->regmap,
+ MAX77686_REG_BUCK3DVS1 + i, max77686->buck3_vol[i]);
+ if (pdata)
+ ret = max77686_get_voltage_proper_val(
+ &buck_dvs_voltage_map_desc,
+ pdata->buck4_voltage[i],
+ pdata->buck4_voltage[i]
+ + buck_dvs_voltage_map_desc.step);
+ /* 1.1V as default for safety */
+ if (!pdata || ret < 0)
+ max77686->buck4_vol[i] = 0x28;
+ else
+ max77686->buck4_vol[i] = ret;
+
+ regmap_write(max77686->iodev->regmap,
+ MAX77686_REG_BUCK4DVS1 + i, max77686->buck4_vol[i]);
+ }
+
+ for (i = 0; i < MAX77686_REGULATORS; i++) {
+ const struct voltage_map_desc *desc;
+ if (pdata)
+ init_data[pdata->regulators[i].id] =
+ pdata->regulators[i].initdata;
+
+ desc = reg_voltage_map[i];
+ if (desc) {
+ regulators[i].n_voltages =
+ (desc->max - desc->min) / desc->step + 1;
+
+ printk(PMIC_DEBUG "%s: desc=%p, id=%d, n_vol=%d, max=%d,
+ min=%d, step=%d\n", __func__, desc, i,
+ regulators[i].n_voltages, desc->max,
+ desc->min, desc->step);
+ }
+
+ rdev[i] = regulator_register(&regulators[i], max77686->dev,
+ init_data[i], max77686, NULL);
+ if (IS_ERR(rdev[i])) {
+ ret = PTR_ERR(rdev[i]);
+ dev_err(max77686->dev,
+ "regulator init failed for %d\n", i);
+ rdev[i] = NULL;
+ goto err;
+ }
+ }
+
+ devm_kfree(&pdev->dev, init_data);
+ return 0;
+err:
+ for (i = 0; i < 3; i++) {
+ if (max77686->buck234_gpios_dvs[i])
+ gpio_free(max77686->buck234_gpios_dvs[i]);
+ if (max77686->buck234_gpios_dvs[i])
+ gpio_free(max77686->buck234_gpios_selb[i]);
+ }
+
+ for (i = 0; i < MAX77686_REGULATORS; i++)
+ if (rdev[i])
+ regulator_unregister(rdev[i]);
+
+ devm_kfree(&pdev->dev, max77686->rdev);
+ devm_kfree(&pdev->dev, max77686);
+
+ return ret;
+}
+
+static int __devexit max77686_pmic_remove(struct platform_device *pdev)
+{
+ struct max77686_data *max77686 = platform_get_drvdata(pdev);
+ struct regulator_dev **rdev = max77686->rdev;
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ if (max77686->buck234_gpios_dvs[i])
+ gpio_free(max77686->buck234_gpios_dvs[i]);
+ if (max77686->buck234_gpios_dvs[i])
+ gpio_free(max77686->buck234_gpios_selb[i]);
+ }
+
+ for (i = 0; i < MAX77686_REGULATORS; i++)
+ if (rdev[i])
+ regulator_unregister(rdev[i]);
+
+ devm_kfree(&pdev->dev, max77686->rdev);
+ devm_kfree(&pdev->dev, max77686);
+
+ return 0;
+}
+
+static const struct platform_device_id max77686_pmic_id[] = {
+ { "max77686-pmic", 0},
+ { },
+};
+MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
+
+static struct platform_driver max77686_pmic_driver = {
+ .driver = {
+ .name = "max77686-pmic",
+ .owner = THIS_MODULE,
+ },
+ .probe = max77686_pmic_probe,
+ .remove = __devexit_p(max77686_pmic_remove),
+ .id_table = max77686_pmic_id,
+};
+
+static int __init max77686_pmic_init(void)
+{
+ return platform_driver_register(&max77686_pmic_driver);
+}
+subsys_initcall(max77686_pmic_init);
+
+static void __exit max77686_pmic_cleanup(void)
+{
+ platform_driver_unregister(&max77686_pmic_driver);
+}
+module_exit(max77686_pmic_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
+MODULE_AUTHOR("Chiwoong Byun <woong.byun@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
1.7.4.1

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