mfd: Add a core driver for TI TPS61050/TPS61052 chips v2

The TPS61050/TPS61052 are boost converters, LED drivers, LED flash
drivers and a simple GPIO pin chips.

Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Jonas Aberg <jonas.aberg@stericsson.com>
Cc: Ola Lilja <ola.o.lilja@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 256 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 500a130857d8..bc99288f8f39 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -129,6 +129,15 @@ config UCB1400_CORE
           To compile this driver as a module, choose M here: the
           module will be called ucb1400_core.
 
+config TPS6105X
+        tristate "TPS61050/61052 Boost Converters"
+        depends on I2C
+        help
+          This option enables a driver for the TP61050/TPS61052
+          high-power "white LED driver". This boost converter is
+          sometimes used for other things than white LEDs, and
+          also contains a GPIO pin.
+
 config TPS65010
         tristate "TPS6501x Power Management chips"
         depends on I2C && GPIOLIB
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0e9f0c51449d..47f5709f3828 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_MFD_WM8350)	+= wm8350.o
 obj-$(CONFIG_MFD_WM8350_I2C)    += wm8350-i2c.o
 obj-$(CONFIG_MFD_WM8994)        += wm8994-core.o wm8994-irq.o
 
+obj-$(CONFIG_TPS6105X)          += tps6105x.o
 obj-$(CONFIG_TPS65010)          += tps65010.o
 obj-$(CONFIG_TPS6507X)          += tps6507x.o
 obj-$(CONFIG_MENELAUS)          += menelaus.o
diff --git a/drivers/mfd/tps6105x.c b/drivers/mfd/tps6105x.c
new file mode 100644
index 000000000000..46d8205646b6
--- /dev/null
+++ b/drivers/mfd/tps6105x.c
@@ -0,0 +1,246 @@
+/*
+ * Core driver for TPS61050/61052 boost converters, used for while LED
+ * driving, audio power amplification, white LED flash, and generic
+ * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
+ * and a flash synchronization pin to synchronize flash events when used as
+ * flashgun.
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/gpio.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/regulator/driver.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps6105x.h>
+
+int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
+{
+        int ret;
+
+        ret = mutex_lock_interruptible(&tps6105x->lock);
+        if (ret)
+                return ret;
+        ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
+        mutex_unlock(&tps6105x->lock);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+EXPORT_SYMBOL(tps6105x_set);
+
+int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
+{
+        int ret;
+
+        ret = mutex_lock_interruptible(&tps6105x->lock);
+        if (ret)
+                return ret;
+        ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
+        mutex_unlock(&tps6105x->lock);
+        if (ret < 0)
+                return ret;
+
+        *buf = ret;
+        return 0;
+}
+EXPORT_SYMBOL(tps6105x_get);
+
+/*
+ * Masks off the bits in the mask and sets the bits in the bitvalues
+ * parameter in one atomic operation
+ */
+int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
+                          u8 bitmask, u8 bitvalues)
+{
+        int ret;
+        u8 regval;
+
+        ret = mutex_lock_interruptible(&tps6105x->lock);
+        if (ret)
+                return ret;
+        ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
+        if (ret < 0)
+                goto fail;
+        regval = ret;
+        regval = (~bitmask & regval) | (bitmask & bitvalues);
+        ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
+fail:
+        mutex_unlock(&tps6105x->lock);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+EXPORT_SYMBOL(tps6105x_mask_and_set);
+
+static int __devinit tps6105x_startup(struct tps6105x *tps6105x)
+{
+        int ret;
+        u8 regval;
+
+        ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
+        if (ret)
+                return ret;
+        switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
+        case TPS6105X_REG0_MODE_SHUTDOWN:
+                dev_info(&tps6105x->client->dev,
+                         "TPS6105x found in SHUTDOWN mode\n");
+                break;
+        case TPS6105X_REG0_MODE_TORCH:
+                dev_info(&tps6105x->client->dev,
+                         "TPS6105x found in TORCH mode\n");
+                break;
+        case TPS6105X_REG0_MODE_TORCH_FLASH:
+                dev_info(&tps6105x->client->dev,
+                         "TPS6105x found in FLASH mode\n");
+                break;
+        case TPS6105X_REG0_MODE_VOLTAGE:
+                dev_info(&tps6105x->client->dev,
+                         "TPS6105x found in VOLTAGE mode\n");
+                break;
+        default:
+                break;
+        }
+
+        return ret;
+}
+
+/*
+ * MFD cells - we have one cell which is selected operation
+ * mode, and we always have a GPIO cell.
+ */
+static struct mfd_cell tps6105x_cells[] = {
+        {
+                /* name will be runtime assigned */
+                .id = -1,
+        },
+        {
+                .name = "tps6105x-gpio",
+                .id = -1,
+        },
+};
+
+static int __devinit tps6105x_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct tps6105x                 *tps6105x;
+        struct tps6105x_platform_data   *pdata;
+        int ret;
+        int i;
+
+        tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL);
+        if (!tps6105x)
+                return -ENOMEM;
+
+        i2c_set_clientdata(client, tps6105x);
+        tps6105x->client = client;
+        pdata = client->dev.platform_data;
+        tps6105x->pdata = pdata;
+        mutex_init(&tps6105x->lock);
+
+        ret = tps6105x_startup(tps6105x);
+        if (ret) {
+                dev_err(&client->dev, "chip initialization failed\n");
+                goto fail;
+        }
+
+        /* Remove warning texts when you implement new cell drivers */
+        switch (pdata->mode) {
+        case TPS6105X_MODE_SHUTDOWN:
+                dev_info(&client->dev,
+                         "present, not used for anything, only GPIO\n");
+                break;
+        case TPS6105X_MODE_TORCH:
+                tps6105x_cells[0].name = "tps6105x-leds";
+                dev_warn(&client->dev,
+                         "torch mode is unsupported\n");
+                break;
+        case TPS6105X_MODE_TORCH_FLASH:
+                tps6105x_cells[0].name = "tps6105x-flash";
+                dev_warn(&client->dev,
+                         "flash mode is unsupported\n");
+                break;
+        case TPS6105X_MODE_VOLTAGE:
+                tps6105x_cells[0].name ="tps6105x-regulator";
+                break;
+        default:
+                break;
+        }
+
+        /* Set up and register the platform devices. */
+        for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
+                /* One state holder for all drivers, this is simple */
+                tps6105x_cells[i].mfd_data = tps6105x;
+        }
+
+        ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
+                ARRAY_SIZE(tps6105x_cells), NULL, 0);
+        if (ret)
+                goto fail;
+
+        return 0;
+
+fail:
+        kfree(tps6105x);
+        return ret;
+}
+
+static int __devexit tps6105x_remove(struct i2c_client *client)
+{
+        struct tps6105x *tps6105x = i2c_get_clientdata(client);
+
+        mfd_remove_devices(&client->dev);
+
+        /* Put chip in shutdown mode */
+        tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
+                TPS6105X_REG0_MODE_MASK,
+                TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
+
+        kfree(tps6105x);
+        return 0;
+}
+
+static const struct i2c_device_id tps6105x_id[] = {
+        { "tps61050", 0 },
+        { "tps61052", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, tps6105x_id);
+
+static struct i2c_driver tps6105x_driver = {
+        .driver = {
+                .name   = "tps6105x",
+        },
+        .probe          = tps6105x_probe,
+        .remove         = __devexit_p(tps6105x_remove),
+        .id_table       = tps6105x_id,
+};
+
+static int __init tps6105x_init(void)
+{
+        return i2c_add_driver(&tps6105x_driver);
+}
+subsys_initcall(tps6105x_init);
+
+static void __exit tps6105x_exit(void)
+{
+        i2c_del_driver(&tps6105x_driver);
+}
+module_exit(tps6105x_exit);
+
+MODULE_AUTHOR("Linus Walleij");
+MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
+MODULE_LICENSE("GPL v2");