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Message-Id: <1269634292-29686-4-git-send-email-todd.fischer@ridgerun.com>
Date: Fri, 26 Mar 2010 14:11:30 -0600
From: Todd Fischer <todd.fischer@...gerun.com>
To: linux-kernel@...r.kernel.org,
davinci-linux-open-source@...ux.davincidsp.com,
sameo@...ux.intel.com, lrg@...mlogic.co.uk,
broonie@...nsource.wolfsonmicro.com, todd.fischer@...gerun.com
Subject: [PATCH 3/5] Add MFD driver for TPS6507x family of multi-function chips
MFD driver for TPS6507x family of multi-function chips.
Signed-off-by: Todd Fischer <todd.fischer@...gerun.com>
---
drivers/mfd/Kconfig | 11 +++
drivers/mfd/Makefile | 3 +-
drivers/mfd/tps6507x.c | 186 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/tps6507x.h | 20 +++++
4 files changed, 219 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/tps6507x.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 951fa9b..8853cab 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -111,6 +111,17 @@ config TPS65010
This driver can also be built as a module. If so, the module
will be called tps65010.
+config TPS6507X
+ tristate "TPS6507x Power Management / Touch Screen chips"
+ depends on I2C
+ help
+ If you say yes here you get support for the TPS6507x series of
+ Power Management / Touch Screen chips. These include voltage
+ regulators, lithium ion/polymer battery charging, touch screen
+ and other features that are often used in portable devices.
+ This driver can also be built as a module. If so, the module
+ will be called tps6507x.
+
config MENELAUS
bool "Texas Instruments TWL92330/Menelaus PM chip"
depends on I2C=y && ARCH_OMAP2
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 22715ad..2bebc95 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_MFD_WM8350_I2C) += wm8350-i2c.o
obj-$(CONFIG_MFD_WM8994) += wm8994-core.o
obj-$(CONFIG_TPS65010) += tps65010.o
+obj-$(CONFIG_TPS6507X) += tps6507x.o
obj-$(CONFIG_MENELAUS) += menelaus.o
obj-$(CONFIG_TWL4030_CORE) += twl-core.o twl4030-irq.o twl6030-irq.o
@@ -62,4 +63,4 @@ obj-$(CONFIG_AB3100_OTP) += ab3100-otp.o
obj-$(CONFIG_AB4500_CORE) += ab4500-core.o
obj-$(CONFIG_MFD_TIMBERDALE) += timberdale.o
obj-$(CONFIG_PMIC_ADP5520) += adp5520.o
-obj-$(CONFIG_LPC_SCH) += lpc_sch.o
\ No newline at end of file
+obj-$(CONFIG_LPC_SCH) += lpc_sch.o
diff --git a/drivers/mfd/tps6507x.c b/drivers/mfd/tps6507x.c
new file mode 100644
index 0000000..f0c2695
--- /dev/null
+++ b/drivers/mfd/tps6507x.c
@@ -0,0 +1,186 @@
+/*
+ * tps6507x.c -- TPS6507x chip family multi-function driver
+ *
+ * Copyright (c) 2010 RidgeRun (todd.fischer@...gerun.com)
+ *
+ * Author: Todd Fischer
+ * todd.fischer@...gerun.com
+ *
+ * Credits:
+ *
+ * Using code from wm8350-i2c.c, Wolfson Microelectronics PLC.
+ *
+ * For licencing details see kernel-base/COPYING
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/tps6507x.h>
+
+struct tps_sub_devices {
+ const char *name;
+ struct platform_device *pdev;
+};
+
+static struct tps_sub_devices tps6507x_sub_devices[] = {
+ { NULL, NULL }
+};
+
+static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
+ int bytes, void *dest)
+{
+ int ret;
+
+ ret = i2c_master_send(tps6507x->i2c_client, ®, 1);
+ if (ret < 0)
+ return ret;
+ ret = i2c_master_recv(tps6507x->i2c_client, dest, bytes);
+ if (ret < 0)
+ return ret;
+ if (ret != bytes)
+ return -EIO;
+ return 0;
+}
+
+static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
+ int bytes, void *src)
+{
+ /* we add 1 byte for device register */
+ u8 msg[(TPS6507X_MAX_REGISTER << 1) + 1];
+ int ret;
+
+ if (bytes > ((TPS6507X_MAX_REGISTER << 1) + 1))
+ return -EINVAL;
+
+ msg[0] = reg;
+ memcpy(&msg[1], src, bytes);
+ ret = i2c_master_send(tps6507x->i2c_client, msg, bytes + 1);
+ if (ret < 0)
+ return ret;
+ if (ret != bytes + 1)
+ return -EIO;
+ return 0;
+}
+
+/*
+ * Register a client device. This is non-fatal since there is no need to
+ * fail the entire device init due to a single platform device failing.
+ */
+static void tps6507x_client_dev_register(struct tps6507x_dev *tps6507x,
+ const char *name,
+ struct platform_device **pdev)
+{
+ int ret;
+
+ *pdev = platform_device_alloc(name, -1);
+ if (*pdev == NULL) {
+ dev_err(tps6507x->dev, "Failed to allocate %s\n", name);
+ return;
+ }
+
+ (*pdev)->dev.parent = tps6507x->dev;
+ platform_set_drvdata(*pdev, tps6507x);
+ ret = platform_device_add(*pdev);
+ if (ret != 0) {
+ dev_err(tps6507x->dev, "Failed to register %s: %d\n",
+ name, ret);
+ platform_device_put(*pdev);
+ *pdev = NULL;
+ }
+}
+
+int tps6507x_device_init(struct tps6507x_dev *tps6507x, int irq,
+ struct tps6507x_board *pdata)
+{
+ int ret = 0;
+ struct tps_sub_devices *d = &tps6507x_sub_devices[0];
+
+ while (d->name) {
+ tps6507x_client_dev_register(tps6507x, d->name, &(d->pdev));
+ d++;
+ }
+
+ return ret;
+}
+
+static int tps6507x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct tps6507x_dev *tps6507x;
+ int ret = 0;
+
+ tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
+ if (tps6507x == NULL) {
+ kfree(i2c);
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(i2c, tps6507x);
+ tps6507x->dev = &i2c->dev;
+ tps6507x->i2c_client = i2c;
+ tps6507x->read_dev = tps6507x_i2c_read_device;
+ tps6507x->write_dev = tps6507x_i2c_write_device;
+ mutex_init(&tps6507x->adc_mutex);
+
+ ret = tps6507x_device_init(tps6507x, i2c->irq, i2c->dev.platform_data);
+ if (ret < 0)
+ goto err;
+
+ return ret;
+
+err:
+ kfree(tps6507x);
+ return ret;
+}
+
+static int tps6507x_i2c_remove(struct i2c_client *i2c)
+{
+ struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
+ struct tps_sub_devices *d = &tps6507x_sub_devices[0];
+
+ while (d->name) {
+ platform_device_unregister(d->pdev);
+ d++;
+ }
+
+ kfree(tps6507x);
+
+ return 0;
+}
+
+static const struct i2c_device_id tps6507x_i2c_id[] = {
+ { "tps6507x", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
+
+
+static struct i2c_driver tps6507x_i2c_driver = {
+ .driver = {
+ .name = "tps6507x",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps6507x_i2c_probe,
+ .remove = tps6507x_i2c_remove,
+ .id_table = tps6507x_i2c_id,
+};
+
+static int __init tps6507x_i2c_init(void)
+{
+ return i2c_add_driver(&tps6507x_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(tps6507x_i2c_init);
+
+static void __exit tps6507x_i2c_exit(void)
+{
+ i2c_del_driver(&tps6507x_i2c_driver);
+}
+module_exit(tps6507x_i2c_exit);
+
+MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/tps6507x.h b/include/linux/mfd/tps6507x.h
index fd73af5..46c3331 100644
--- a/include/linux/mfd/tps6507x.h
+++ b/include/linux/mfd/tps6507x.h
@@ -131,6 +131,8 @@
/* VDCDC MASK */
#define TPS6507X_DEFDCDCX_DCDC_MASK 0X3F
+#define TPS6507X_MAX_REGISTER 0X19
+
/**
* struct tps6507x_board - packages regulator and touchscreen init data
* @tps6507x_regulator_data: regulator initialization values
@@ -142,4 +144,22 @@ struct tps6507x_board {
struct regulator_init_data *tps6507x_pmic_init_data;
};
+/**
+ * struct tps6507x_dev - tps6507x sub-driver chip access routines
+ * @read_dev() - I2C register read function
+ * @write_dev() - I2C register write function
+ *
+ * Device data may be used to access the TPS6507x chip
+ */
+
+struct tps6507x_dev {
+ struct device *dev;
+ struct i2c_client *i2c_client;
+ int (*read_dev)(struct tps6507x_dev *tps6507x, char reg, int size,
+ void *dest);
+ int (*write_dev)(struct tps6507x_dev *tps6507x, char reg, int size,
+ void *src);
+ struct mutex adc_mutex;
+};
+
#endif /* __LINUX_MFD_TPS6507X_H */
--
1.6.0.4
--
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