[PATCH 1/3] mfd: add a core driver for TI TPS61050/TPS61052 chips v2

From: Linus Walleij
Date: Wed Mar 09 2011 - 07:03:19 EST

From: Linus Walleij <linus.walleij@xxxxxxxxxx>

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

Cc: Liam Girdwood <lrg@xxxxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: Jonas Aberg <jonas.aberg@xxxxxxxxxxxxxx>
Cc: Ola Lilja <ola.o.lilja@xxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/mfd/Kconfig | 9 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/tps6105x.c | 244 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/tps6105x.h | 95 ++++++++++++++++
4 files changed, 349 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/tps6105x.c
create mode 100644 include/linux/mfd/tps6105x.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fd01836..35b085a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -118,6 +118,15 @@ 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 a54e2c7..6eb8372 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -32,6 +32,7 @@ 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 0000000..d5c9507
--- /dev/null
+++ b/drivers/mfd/tps6105x.c
@@ -0,0 +1,244 @@
+/*
+ * 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@xxxxxxxxxx>
+ *
+ * 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;
+}
+
+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;
+}
+
+/*
+ * 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;
+}
+
+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].driver_data = tps6105x;
+ }
+
+ ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
+ ARRAY_SIZE(tps6105x_cells), NULL, 0);
+ if (ret)
+ goto fail;
+
+ return 0;
+
+fail:
+ i2c_set_clientdata(client, NULL);
+ 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");
diff --git a/include/linux/mfd/tps6105x.h b/include/linux/mfd/tps6105x.h
new file mode 100644
index 0000000..f259244
--- /dev/null
+++ b/include/linux/mfd/tps6105x.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ *
+ * Author: Linus Walleij <linus.walleij@xxxxxxxxxx>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef MFD_TPS6105X_H
+#define MFD_TPS6105X_H
+
+#include <linux/i2c.h>
+
+/*
+ * Register definitions to all subdrivers
+ */
+#define TPS6105X_REG_0 0x00
+#define TPS6105X_REG0_MODE_SHIFT 6
+#define TPS6105X_REG0_MODE_MASK (0x03<<6)
+/* These defines for both reg0 and reg1 */
+#define TPS6105X_REG0_MODE_SHUTDOWN 0x00
+#define TPS6105X_REG0_MODE_TORCH 0x01
+#define TPS6105X_REG0_MODE_TORCH_FLASH 0x02
+#define TPS6105X_REG0_MODE_VOLTAGE 0x03
+#define TPS6105X_REG0_VOLTAGE_SHIFT 4
+#define TPS6105X_REG0_VOLTAGE_MASK (3<<4)
+#define TPS6105X_REG0_VOLTAGE_450 0
+#define TPS6105X_REG0_VOLTAGE_500 1
+#define TPS6105X_REG0_VOLTAGE_525 2
+#define TPS6105X_REG0_VOLTAGE_500_2 3
+#define TPS6105X_REG0_DIMMING_SHIFT 3
+#define TPS6105X_REG0_TORCHC_SHIFT 0
+#define TPS6105X_REG0_TORCHC_MASK (7<<0)
+#define TPS6105X_REG0_TORCHC_0 0x00
+#define TPS6105X_REG0_TORCHC_50 0x01
+#define TPS6105X_REG0_TORCHC_75 0x02
+#define TPS6105X_REG0_TORCHC_100 0x03
+#define TPS6105X_REG0_TORCHC_150 0x04
+#define TPS6105X_REG0_TORCHC_200 0x05
+#define TPS6105X_REG0_TORCHC_250_400 0x06
+#define TPS6105X_REG0_TORCHC_250_500 0x07
+#define TPS6105X_REG_1 0x01
+#define TPS6105X_REG1_MODE_SHIFT 6
+#define TPS6105X_REG1_MODE_MASK (0x03<<6)
+#define TPS6105X_REG1_MODE_SHUTDOWN 0x00
+#define TPS6105X_REG1_MODE_TORCH 0x01
+#define TPS6105X_REG1_MODE_TORCH_FLASH 0x02
+#define TPS6105X_REG1_MODE_VOLTAGE 0x03
+#define TPS6105X_REG_2 0x02
+#define TPS6105X_REG_3 0x03
+
+/**
+ * enum tps6105x_mode - desired mode for the TPS6105x
+ * @TPS6105X_MODE_SHUTDOWN: this instance is inactive, not used for anything
+ * @TPS61905X_MODE_TORCH: this instance is used as a LED, usually a while
+ * LED, for example as backlight or flashlight. If this is set, the
+ * TPS6105X will register to the LED framework
+ * @TPS6105X_MODE_TORCH_FLASH: this instance is used as a flashgun, usually
+ * in a camera
+ * @TPS6105X_MODE_VOLTAGE: this instance is used as a voltage regulator and
+ * will register to the regulator framework
+ */
+enum tps6105x_mode {
+ TPS6105X_MODE_SHUTDOWN,
+ TPS6105X_MODE_TORCH,
+ TPS6105X_MODE_TORCH_FLASH,
+ TPS6105X_MODE_VOLTAGE,
+};
+
+/**
+ * struct tps6105x_platform_data - TPS61905x platform data
+ * @mode: what mode this instance shall be operated in,
+ * this is not selectable at runtime
+ */
+struct tps6105x_platform_data {
+ enum tps6105x_mode mode;
+};
+
+/**
+ * struct tps6105x - state holder for the TPS6105x drivers
+ * @mutex: mutex to serialize I2C accesses
+ * @i2c_client: corresponding I2C client
+ */
+struct tps6105x {
+ struct tps6105x_platform_data *pdata;
+ struct mutex lock;
+ struct i2c_client *client;
+};
+
+extern int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value);
+extern int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf);
+extern int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
+ u8 bitmask, u8 bitvalues);
+
+#endif
--
1.7.3.2

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