mfd: Add TPS6586x driver
authorMike Rapoport <mike@compulab.co.il>
Tue, 10 Aug 2010 23:11:04 +0000 (01:11 +0200)
committerSamuel Ortiz <sameo@linux.intel.com>
Thu, 12 Aug 2010 09:28:12 +0000 (11:28 +0200)
Add mfd core driver for TPS6586x PMICs family.
The driver provides I/O access for the sub-device drivers and performs
regstration of the sub-devices based on the platform requirements.
In addition it implements GPIOlib interface for the chip GPIOs.

TODO:
        - add interrupt support
        - add platform data for PWM, backlight leds and charger

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
drivers/mfd/Kconfig
drivers/mfd/Makefile
drivers/mfd/tps6586x.c [new file with mode: 0644]
include/linux/mfd/tps6586x.h [new file with mode: 0644]

index 23a891f396e42db2a8c60c26b13c8c20269840f8..d75909e7cf2f1ce23b1d49e3df42d08d26051802 100644 (file)
@@ -531,6 +531,20 @@ config MFD_JZ4740_ADC
          Say yes here if you want support for the ADC unit in the JZ4740 SoC.
          This driver is necessary for jz4740-battery and jz4740-hwmon driver.
 
+config MFD_TPS6586X
+       tristate "TPS6586x Power Management chips"
+       depends on I2C && GPIOLIB
+       select MFD_CORE
+       help
+         If you say yes here you get support for the TPS6586X series of
+         Power Management chips.
+         This driver provides common support for accessing the device,
+         additional drivers must be enabled in order to use the
+         functionality of the device.
+
+         This driver can also be built as a module.  If so, the module
+         will be called tps6586x.
+
 endif # MFD_SUPPORT
 
 menu "Multimedia Capabilities Port drivers"
index cc7cce0976f3de0e3b810b602f9cd55ab1052266..1e48d7e3e8849dbc160b89e29a96e3336e7571b6 100644 (file)
@@ -74,3 +74,4 @@ obj-$(CONFIG_LPC_SCH)         += lpc_sch.o
 obj-$(CONFIG_MFD_RDC321X)      += rdc321x-southbridge.o
 obj-$(CONFIG_MFD_JANZ_CMODIO)  += janz-cmodio.o
 obj-$(CONFIG_MFD_JZ4740_ADC)   += jz4740-adc.o
+obj-$(CONFIG_MFD_TPS6586X)     += tps6586x.o
diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
new file mode 100644 (file)
index 0000000..4cde31e
--- /dev/null
@@ -0,0 +1,375 @@
+/*
+ * Core driver for TI TPS6586x PMIC family
+ *
+ * Copyright (c) 2010 CompuLab Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on da903x.c.
+ * Copyright (C) 2008 Compulab, Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ * Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps6586x.h>
+
+/* GPIO control registers */
+#define TPS6586X_GPIOSET1      0x5d
+#define TPS6586X_GPIOSET2      0x5e
+
+/* device id */
+#define TPS6586X_VERSIONCRC    0xcd
+#define TPS658621A_VERSIONCRC  0x15
+
+struct tps6586x {
+       struct mutex            lock;
+       struct device           *dev;
+       struct i2c_client       *client;
+
+       struct gpio_chip        gpio;
+};
+
+static inline int __tps6586x_read(struct i2c_client *client,
+                                 int reg, uint8_t *val)
+{
+       int ret;
+
+       ret = i2c_smbus_read_byte_data(client, reg);
+       if (ret < 0) {
+               dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
+               return ret;
+       }
+
+       *val = (uint8_t)ret;
+
+       return 0;
+}
+
+static inline int __tps6586x_reads(struct i2c_client *client, int reg,
+                                  int len, uint8_t *val)
+{
+       int ret;
+
+       ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
+       if (ret < 0) {
+               dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
+               return ret;
+       }
+
+       return 0;
+}
+
+static inline int __tps6586x_write(struct i2c_client *client,
+                                int reg, uint8_t val)
+{
+       int ret;
+
+       ret = i2c_smbus_write_byte_data(client, reg, val);
+       if (ret < 0) {
+               dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
+                               val, reg);
+               return ret;
+       }
+
+       return 0;
+}
+
+static inline int __tps6586x_writes(struct i2c_client *client, int reg,
+                                 int len, uint8_t *val)
+{
+       int ret;
+
+       ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
+       if (ret < 0) {
+               dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
+               return ret;
+       }
+
+       return 0;
+}
+
+int tps6586x_write(struct device *dev, int reg, uint8_t val)
+{
+       return __tps6586x_write(to_i2c_client(dev), reg, val);
+}
+EXPORT_SYMBOL_GPL(tps6586x_write);
+
+int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
+{
+       return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
+}
+EXPORT_SYMBOL_GPL(tps6586x_writes);
+
+int tps6586x_read(struct device *dev, int reg, uint8_t *val)
+{
+       return __tps6586x_read(to_i2c_client(dev), reg, val);
+}
+EXPORT_SYMBOL_GPL(tps6586x_read);
+
+int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
+{
+       return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
+}
+EXPORT_SYMBOL_GPL(tps6586x_reads);
+
+int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
+{
+       struct tps6586x *tps6586x = dev_get_drvdata(dev);
+       uint8_t reg_val;
+       int ret = 0;
+
+       mutex_lock(&tps6586x->lock);
+
+       ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
+       if (ret)
+               goto out;
+
+       if ((reg_val & bit_mask) == 0) {
+               reg_val |= bit_mask;
+               ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
+       }
+out:
+       mutex_unlock(&tps6586x->lock);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(tps6586x_set_bits);
+
+int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
+{
+       struct tps6586x *tps6586x = dev_get_drvdata(dev);
+       uint8_t reg_val;
+       int ret = 0;
+
+       mutex_lock(&tps6586x->lock);
+
+       ret = __tps6586x_read(to_i2c_client(dev), reg, &reg_val);
+       if (ret)
+               goto out;
+
+       if (reg_val & bit_mask) {
+               reg_val &= ~bit_mask;
+               ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
+       }
+out:
+       mutex_unlock(&tps6586x->lock);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
+
+int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
+{
+       struct tps6586x *tps6586x = dev_get_drvdata(dev);
+       uint8_t reg_val;
+       int ret = 0;
+
+       mutex_lock(&tps6586x->lock);
+
+       ret = __tps6586x_read(tps6586x->client, reg, &reg_val);
+       if (ret)
+               goto out;
+
+       if ((reg_val & mask) != val) {
+               reg_val = (reg_val & ~mask) | val;
+               ret = __tps6586x_write(tps6586x->client, reg, reg_val);
+       }
+out:
+       mutex_unlock(&tps6586x->lock);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(tps6586x_update);
+
+static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+       struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
+       uint8_t val;
+       int ret;
+
+       ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
+       if (ret)
+               return ret;
+
+       return !!(val & (1 << offset));
+}
+
+
+static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
+                             int value)
+{
+       struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
+
+       __tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
+                        value << offset);
+}
+
+static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
+                               int value)
+{
+       struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
+       uint8_t val, mask;
+
+       tps6586x_gpio_set(gc, offset, value);
+
+       val = 0x1 << (offset * 2);
+       mask = 0x3 << (offset * 2);
+
+       return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
+}
+
+static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
+{
+       int ret;
+
+       if (!gpio_base)
+               return;
+
+       tps6586x->gpio.owner            = THIS_MODULE;
+       tps6586x->gpio.label            = tps6586x->client->name;
+       tps6586x->gpio.dev              = tps6586x->dev;
+       tps6586x->gpio.base             = gpio_base;
+       tps6586x->gpio.ngpio            = 4;
+       tps6586x->gpio.can_sleep        = 1;
+
+       /* FIXME: add handling of GPIOs as dedicated inputs */
+       tps6586x->gpio.direction_output = tps6586x_gpio_output;
+       tps6586x->gpio.set              = tps6586x_gpio_set;
+       tps6586x->gpio.get              = tps6586x_gpio_get;
+
+       ret = gpiochip_add(&tps6586x->gpio);
+       if (ret)
+               dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
+}
+
+static int __remove_subdev(struct device *dev, void *unused)
+{
+       platform_device_unregister(to_platform_device(dev));
+       return 0;
+}
+
+static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
+{
+       return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
+}
+
+static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
+                                         struct tps6586x_platform_data *pdata)
+{
+       struct tps6586x_subdev_info *subdev;
+       struct platform_device *pdev;
+       int i, ret = 0;
+
+       for (i = 0; i < pdata->num_subdevs; i++) {
+               subdev = &pdata->subdevs[i];
+
+               pdev = platform_device_alloc(subdev->name, subdev->id);
+
+               pdev->dev.parent = tps6586x->dev;
+               pdev->dev.platform_data = subdev->platform_data;
+
+               ret = platform_device_add(pdev);
+               if (ret)
+                       goto failed;
+       }
+       return 0;
+
+failed:
+       tps6586x_remove_subdevs(tps6586x);
+       return ret;
+}
+
+static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
+                                       const struct i2c_device_id *id)
+{
+       struct tps6586x_platform_data *pdata = client->dev.platform_data;
+       struct tps6586x *tps6586x;
+       int ret;
+
+       if (!pdata) {
+               dev_err(&client->dev, "tps6586x requires platform data\n");
+               return -ENOTSUPP;
+       }
+
+       ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
+       if (ret < 0) {
+               dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
+               return -EIO;
+       }
+
+       if (ret != TPS658621A_VERSIONCRC) {
+               dev_err(&client->dev, "Unsupported chip ID: %x\n", ret);
+               return -ENODEV;
+       }
+
+       tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
+       if (tps6586x == NULL)
+               return -ENOMEM;
+
+       tps6586x->client = client;
+       tps6586x->dev = &client->dev;
+       i2c_set_clientdata(client, tps6586x);
+
+       mutex_init(&tps6586x->lock);
+
+       ret = tps6586x_add_subdevs(tps6586x, pdata);
+       if (ret) {
+               dev_err(&client->dev, "add devices failed: %d\n", ret);
+               goto err_add_devs;
+       }
+
+       tps6586x_gpio_init(tps6586x, pdata->gpio_base);
+
+       return 0;
+
+err_add_devs:
+       kfree(tps6586x);
+       return ret;
+}
+
+static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
+{
+       return 0;
+}
+
+static const struct i2c_device_id tps6586x_id_table[] = {
+       { "tps6586x", 0 },
+       { },
+};
+MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
+
+static struct i2c_driver tps6586x_driver = {
+       .driver = {
+               .name   = "tps6586x",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = tps6586x_i2c_probe,
+       .remove         = __devexit_p(tps6586x_i2c_remove),
+       .id_table       = tps6586x_id_table,
+};
+
+static int __init tps6586x_init(void)
+{
+       return i2c_add_driver(&tps6586x_driver);
+}
+subsys_initcall(tps6586x_init);
+
+static void __exit tps6586x_exit(void)
+{
+       i2c_del_driver(&tps6586x_driver);
+}
+module_exit(tps6586x_exit);
+
+MODULE_DESCRIPTION("TPS6586X core driver");
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_LICENSE("GPL");
+
diff --git a/include/linux/mfd/tps6586x.h b/include/linux/mfd/tps6586x.h
new file mode 100644 (file)
index 0000000..772b3ae
--- /dev/null
@@ -0,0 +1,47 @@
+#ifndef __LINUX_MFD_TPS6586X_H
+#define __LINUX_MFD_TPS6586X_H
+
+enum {
+       TPS6586X_ID_SM_0,
+       TPS6586X_ID_SM_1,
+       TPS6586X_ID_SM_2,
+       TPS6586X_ID_LDO_0,
+       TPS6586X_ID_LDO_1,
+       TPS6586X_ID_LDO_2,
+       TPS6586X_ID_LDO_3,
+       TPS6586X_ID_LDO_4,
+       TPS6586X_ID_LDO_5,
+       TPS6586X_ID_LDO_6,
+       TPS6586X_ID_LDO_7,
+       TPS6586X_ID_LDO_8,
+       TPS6586X_ID_LDO_9,
+       TPS6586X_ID_LDO_RTC,
+};
+
+struct tps6586x_subdev_info {
+       int             id;
+       const char      *name;
+       void            *platform_data;
+};
+
+struct tps6586x_platform_data {
+       int num_subdevs;
+       struct tps6586x_subdev_info *subdevs;
+
+       int gpio_base;
+};
+
+/*
+ * NOTE: the functions below are not intended for use outside
+ * of the TPS6586X sub-device drivers
+ */
+extern int tps6586x_write(struct device *dev, int reg, uint8_t val);
+extern int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val);
+extern int tps6586x_read(struct device *dev, int reg, uint8_t *val);
+extern int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val);
+extern int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask);
+extern int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask);
+extern int tps6586x_update(struct device *dev, int reg, uint8_t val,
+                          uint8_t mask);
+
+#endif /*__LINUX_MFD_TPS6586X_H */