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Message-Id: <20160623192104.18720-8-megous@megous.com>
Date: Thu, 23 Jun 2016 21:20:57 +0200
From: megous@...ous.com
To: dev@...ux-sunxi.org
Cc: linux-arm-kernel@...ts.infradead.org,
Ondrej Jirman <megous@...ous.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 07/14] regulator: SY8106A regulator driver
From: Ondrej Jirman <megous@...ous.com>
SY8106A is I2C attached single output voltage regulator
made by Silergy.
Signed-off-by: Ondrej Jirman <megous@...ous.com>
---
drivers/regulator/Kconfig | 8 +-
drivers/regulator/Makefile | 2 +-
drivers/regulator/sy8106a-regulator.c | 153 ++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+), 2 deletions(-)
create mode 100644 drivers/regulator/sy8106a-regulator.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 144cbf5..fc3fae2 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -860,5 +860,11 @@ config REGULATOR_WM8994
This driver provides support for the voltage regulators on the
WM8994 CODEC.
-endif
+config REGULATOR_SY8106A
+ tristate "Silergy SY8106A"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ This driver provides support for the voltage regulator SY8106A.
+endif
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 85a1d44..f382095 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -110,6 +110,6 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
-
+obj-$(CONFIG_REGULATOR_SY8106A) += sy8106a-regulator.o
ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/sy8106a-regulator.c b/drivers/regulator/sy8106a-regulator.c
new file mode 100644
index 0000000..34bd69c
--- /dev/null
+++ b/drivers/regulator/sy8106a-regulator.c
@@ -0,0 +1,153 @@
+/*
+ * sy8106a-regulator.c - Regulator device driver for SY8106A
+ *
+ * Copyright (C) 2016 Ondřej Jirman <megous@...ous.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regmap.h>
+
+#define SY8106A_REG_VOUT1_SEL 0x01
+#define SY8106A_REG_VOUT_COM 0x02
+#define SY8106A_REG_VOUT1_SEL_MASK 0x7f
+#define SY8106A_DISABLE_REG 0x01
+
+struct sy8106a {
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+};
+
+static const struct regmap_config sy8106a_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int sy8106a_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
+{
+ return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
+ 0xff, sel | 0x80);
+}
+
+static const struct regulator_ops sy8106a_ops = {
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_voltage_sel = sy8106a_set_voltage_sel,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+};
+
+/* Default limits measured in millivolts and milliamps */
+#define SY8106A_MIN_MV 680
+#define SY8106A_MAX_MV 1950
+#define SY8106A_STEP_MV 10
+
+static const struct regulator_desc sy8106a_reg = {
+ .name = "SY8106A",
+ .id = 0,
+ .ops = &sy8106a_ops,
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,
+ .min_uV = (SY8106A_MIN_MV * 1000),
+ .uV_step = (SY8106A_STEP_MV * 1000),
+ .vsel_reg = SY8106A_REG_VOUT1_SEL,
+ .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,
+ .enable_reg = SY8106A_REG_VOUT_COM,
+ .enable_mask = SY8106A_DISABLE_REG,
+ .disable_val = SY8106A_DISABLE_REG,
+ .enable_is_inverted = 1,
+ .owner = THIS_MODULE,
+};
+
+/*
+ * I2C driver interface functions
+ */
+static int sy8106a_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct sy8106a *chip;
+ struct device *dev = &i2c->dev;
+ struct regulator_dev *rdev = NULL;
+ struct regulator_config config = { };
+ unsigned int selector;
+ int error;
+
+ chip = devm_kzalloc(&i2c->dev, sizeof(struct sy8106a), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);
+ if (IS_ERR(chip->regmap)) {
+ error = PTR_ERR(chip->regmap);
+ dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
+ error);
+ return error;
+ }
+
+ config.dev = &i2c->dev;
+ config.init_data = of_get_regulator_init_data(dev, dev->of_node, &sy8106a_reg);
+ config.driver_data = chip;
+ config.regmap = chip->regmap;
+ config.of_node = dev->of_node;
+
+ /* Probe regulator */
+ error = regmap_read(chip->regmap, SY8106A_REG_VOUT1_SEL, &selector);
+ dev_info(&i2c->dev, "SY8106A voltage at boot: %u mV\n", SY8106A_MIN_MV + SY8106A_STEP_MV * (selector & SY8106A_REG_VOUT1_SEL_MASK));
+ if (error) {
+ dev_err(&i2c->dev, "Failed to read voltage at probe time: %d\n", error);
+ return error;
+ }
+
+ rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev, "Failed to register SY8106A regulator\n");
+ return PTR_ERR(rdev);
+ }
+
+ chip->rdev = rdev;
+
+ i2c_set_clientdata(i2c, chip);
+
+ return 0;
+}
+
+static const struct i2c_device_id sy8106a_i2c_id[] = {
+ {"sy8106a", 0},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);
+
+static struct i2c_driver sy8106a_regulator_driver = {
+ .driver = {
+ .name = "sy8106a",
+ },
+ .probe = sy8106a_i2c_probe,
+ .id_table = sy8106a_i2c_id,
+};
+
+module_i2c_driver(sy8106a_regulator_driver);
+
+MODULE_AUTHOR("Ondřej Jirman <megous@...ous.com>");
+MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");
+MODULE_LICENSE("GPL v2");
--
2.9.0
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