regulator: new drivers for AD5398 and AD5821

The AD5398 and AD5821 are single 10-bit DAC with 120 mA output current
sink capability. They feature an internal reference and operates from
a single 2.7 V to 5.5 V supply.

This driver supports both the AD5398 and the AD5821.  It adapts into the
voltage and current framework.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 04f2e08..679ea37 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -201,5 +201,11 @@ config REGULATOR_88PM8607
        help
          This driver supports 88PM8607 voltage regulator chips.
 
+config REGULATOR_AD5398
+       tristate "Analog Devices AD5398/AD5821 regulators"
+       depends on I2C
+       help
+         This driver supports AD5398 and AD5821 current regulator chips.
+         If building into module, its name is ad5398.ko.
 endif
 

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 4e7feec..c256668 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
 obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
 obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
+obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
 obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o

diff --git a/drivers/regulator/ad5398.c b/drivers/regulator/ad5398.c
new file mode 100644 (file)
index 0000000..6de6bda
--- /dev/null
+++ b/drivers/regulator/ad5398.c
@@ -0,0 +1,288 @@
+/*
+ * Voltage and current regulation for AD5398 and AD5821
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+#define AD5398_CURRENT_EN_MASK 0x8000
+
+struct ad5398_chip_info {
+       struct i2c_client *client;
+       int min_uA;
+       int max_uA;
+       unsigned int current_level;
+       unsigned int current_mask;
+       unsigned int current_offset;
+       struct regulator_dev rdev;
+};
+
+static int ad5398_calc_current(struct ad5398_chip_info *chip,
+       unsigned selector)
+{
+       unsigned range_uA = chip->max_uA - chip->min_uA;
+
+       return chip->min_uA + (selector * range_uA / chip->current_level);
+}
+
+static int ad5398_read_reg(struct i2c_client *client, unsigned short *data)
+{
+       unsigned short val;
+       int ret;
+
+       ret = i2c_master_recv(client, (char *)&val, 2);
+       if (ret < 0) {
+               dev_err(&client->dev, "I2C read error\n");
+               return ret;
+       }
+       *data = be16_to_cpu(val);
+
+       return ret;
+}
+
+static int ad5398_write_reg(struct i2c_client *client, const unsigned short data)
+{
+       unsigned short val;
+       int ret;
+
+       val = cpu_to_be16(data);
+       ret = i2c_master_send(client, (char *)&val, 2);
+       if (ret < 0)
+               dev_err(&client->dev, "I2C write error\n");
+
+       return ret;
+}
+
+static int ad5398_get_current_limit(struct regulator_dev *rdev)
+{
+       struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
+       struct i2c_client *client = chip->client;
+       unsigned short data;
+       int ret;
+
+       ret = ad5398_read_reg(client, &data);
+       if (ret < 0)
+               return ret;
+
+       ret = (data & chip->current_mask) >> chip->current_offset;
+
+       return ad5398_calc_current(chip, ret);
+}
+
+static int ad5398_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
+{
+       struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
+       struct i2c_client *client = chip->client;
+       unsigned range_uA = chip->max_uA - chip->min_uA;
+       unsigned selector;
+       unsigned short data;
+       int ret;
+
+       if (min_uA > chip->max_uA || min_uA < chip->min_uA)
+               return -EINVAL;
+       if (max_uA > chip->max_uA || max_uA < chip->min_uA)
+               return -EINVAL;
+
+       selector = ((min_uA - chip->min_uA) * chip->current_level +
+                       range_uA - 1) / range_uA;
+       if (ad5398_calc_current(chip, selector) > max_uA)
+               return -EINVAL;
+
+       dev_dbg(&client->dev, "changing current %dmA\n",
+               ad5398_calc_current(chip, selector) / 1000);
+
+       /* read chip enable bit */
+       ret = ad5398_read_reg(client, &data);
+       if (ret < 0)
+               return ret;
+
+       /* prepare register data */
+       selector = (selector << chip->current_offset) & chip->current_mask;
+       data = (unsigned short)selector | (data & AD5398_CURRENT_EN_MASK);
+
+       /* write the new current value back as well as enable bit */
+       ret = ad5398_write_reg(client, data);
+
+       return ret;
+}
+
+static int ad5398_is_enabled(struct regulator_dev *rdev)
+{
+       struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
+       struct i2c_client *client = chip->client;
+       unsigned short data;
+       int ret;
+
+       ret = ad5398_read_reg(client, &data);
+       if (ret < 0)
+               return ret;
+
+       if (data & AD5398_CURRENT_EN_MASK)
+               return 1;
+       else
+               return 0;
+}
+
+static int ad5398_enable(struct regulator_dev *rdev)
+{
+       struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
+       struct i2c_client *client = chip->client;
+       unsigned short data;
+       int ret;
+
+       ret = ad5398_read_reg(client, &data);
+       if (ret < 0)
+               return ret;
+
+       if (data & AD5398_CURRENT_EN_MASK)
+               return 0;
+
+       data |= AD5398_CURRENT_EN_MASK;
+
+       ret = ad5398_write_reg(client, data);
+
+       return ret;
+}
+
+static int ad5398_disable(struct regulator_dev *rdev)
+{
+       struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
+       struct i2c_client *client = chip->client;
+       unsigned short data;
+       int ret;
+
+       ret = ad5398_read_reg(client, &data);
+       if (ret < 0)
+               return ret;
+
+       if (!(data & AD5398_CURRENT_EN_MASK))
+               return 0;
+
+       data &= ~AD5398_CURRENT_EN_MASK;
+
+       ret = ad5398_write_reg(client, data);
+
+       return ret;
+}
+
+static struct regulator_ops ad5398_ops = {
+       .get_current_limit = ad5398_get_current_limit,
+       .set_current_limit = ad5398_set_current_limit,
+       .enable = ad5398_enable,
+       .disable = ad5398_disable,
+       .is_enabled = ad5398_is_enabled,
+};
+
+static struct regulator_desc ad5398_reg = {
+       .name = "isink",
+       .id = 0,
+       .ops = &ad5398_ops,
+       .type = REGULATOR_CURRENT,
+       .owner = THIS_MODULE,
+};
+
+struct ad5398_current_data_format {
+       int current_bits;
+       int current_offset;
+       int min_uA;
+       int max_uA;
+};
+
+static const struct ad5398_current_data_format df_10_4_120 = {10, 4, 0, 120000};
+
+static const struct i2c_device_id ad5398_id[] = {
+       { "ad5398", (kernel_ulong_t)&df_10_4_120 },
+       { "ad5821", (kernel_ulong_t)&df_10_4_120 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, ad5398_id);
+
+static int __devinit ad5398_probe(struct i2c_client *client,
+                               const struct i2c_device_id *id)
+{
+       struct regulator_dev *rdev;
+       struct regulator_init_data *init_data = client->dev.platform_data;
+       struct ad5398_chip_info *chip;
+       const struct ad5398_current_data_format *df =
+                       (struct ad5398_current_data_format *)id->driver_data;
+       int ret;
+
+       if (!init_data)
+               return -EINVAL;
+
+       chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+       if (!chip)
+               return -ENOMEM;
+
+       chip->client = client;
+
+       chip->min_uA = df->min_uA;
+       chip->max_uA = df->max_uA;
+       chip->current_level = 1 << df->current_bits;
+       chip->current_offset = df->current_offset;
+       chip->current_mask = (chip->current_level - 1) << chip->current_offset;
+
+       rdev = regulator_register(&ad5398_reg, &client->dev, init_data, chip);
+       if (IS_ERR(rdev)) {
+               ret = PTR_ERR(rdev);
+               dev_err(&client->dev, "failed to register %s %s\n",
+                       id->name, ad5398_reg.name);
+               goto err;
+       }
+
+       i2c_set_clientdata(client, chip);
+       dev_dbg(&client->dev, "%s regulator driver is registered.\n", id->name);
+       return 0;
+
+err:
+       kfree(chip);
+       return ret;
+}
+
+static int __devexit ad5398_remove(struct i2c_client *client)
+{
+       struct ad5398_chip_info *chip = i2c_get_clientdata(client);
+
+       regulator_unregister(&chip->rdev);
+       kfree(chip);
+       i2c_set_clientdata(client, NULL);
+
+       return 0;
+}
+
+static struct i2c_driver ad5398_driver = {
+       .probe = ad5398_probe,
+       .remove = __devexit_p(ad5398_remove),
+       .driver         = {
+               .name   = "ad5398",
+       },
+       .id_table       = ad5398_id,
+};
+
+static int __init ad5398_init(void)
+{
+       return i2c_add_driver(&ad5398_driver);
+}
+module_init(ad5398_init);
+
+static void __exit ad5398_exit(void)
+{
+       i2c_del_driver(&ad5398_driver);
+}
+module_exit(ad5398_exit);
+
+MODULE_DESCRIPTION("AD5398 and AD5821 current regulator driver");
+MODULE_AUTHOR("Sonic Zhang");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i2c:ad5398-regulator");