[PATCH v4 1/2] mfd: add stmpe-i2c driver
Steffen Trumtrar
s.trumtrar at pengutronix.de
Wed Sep 5 04:23:52 EDT 2012
The stmpe mfds can be connected via i2c and spi. This driver provides the basic
infrastructure for the i2c kind. It can be added as a normal i2c-device in the
board code. To enable functions a platform_data struct has to be provided, that
describes what parts of the chip are to be used.
Signed-off-by: Steffen Trumtrar <s.trumtrar at pengutronix.de>
---
drivers/mfd/Kconfig | 4 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/stmpe-i2c.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++
include/mfd/stmpe-i2c.h | 53 ++++++++++++++++
4 files changed, 211 insertions(+)
create mode 100644 drivers/mfd/stmpe-i2c.c
create mode 100644 include/mfd/stmpe-i2c.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index af67935..20eef86 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -33,4 +33,8 @@ config I2C_TWL6030
select I2C_TWLCORE
bool "TWL6030 driver"
+config I2C_STMPE
+ depends on I2C
+ bool "STMPE-i2c driver"
+
endmenu
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e11223b..792ae2d 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_I2C_LP3972) += lp3972.o
obj-$(CONFIG_I2C_TWLCORE) += twl-core.o
obj-$(CONFIG_I2C_TWL4030) += twl4030.o
obj-$(CONFIG_I2C_TWL6030) += twl6030.o
+obj-$(CONFIG_I2C_STMPE) += stmpe-i2c.o
diff --git a/drivers/mfd/stmpe-i2c.c b/drivers/mfd/stmpe-i2c.c
new file mode 100644
index 0000000..4af8b7b
--- /dev/null
+++ b/drivers/mfd/stmpe-i2c.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 2012 Pengutronix
+ * Steffen Trumtrar <s.trumtrar at pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+
+#include <i2c/i2c.h>
+#include <mfd/stmpe-i2c.h>
+
+#define DRIVERNAME "stmpe-i2c"
+
+#define to_stmpe(a) container_of(a, struct stmpe, cdev)
+
+int stmpe_reg_read(struct stmpe *stmpe, u32 reg, u8 *val)
+{
+ int ret;
+
+ ret = i2c_read_reg(stmpe->client, reg, val, 1);
+
+ return ret == 1 ? 0 : ret;
+}
+EXPORT_SYMBOL(stmpe_reg_read)
+
+int stmpe_reg_write(struct stmpe *stmpe, u32 reg, u8 val)
+{
+ int ret;
+
+ ret = i2c_write_reg(stmpe->client, reg, &val, 1);
+
+ return ret == 1 ? 0 : ret;
+}
+EXPORT_SYMBOL(stmpe_reg_write)
+
+int stmpe_set_bits(struct stmpe *stmpe, u32 reg, u8 mask, u8 val)
+{
+ u8 tmp;
+ int err;
+
+ err = stmpe_reg_read(stmpe, reg, &tmp);
+ tmp = (tmp & ~mask) | val;
+
+ if (!err)
+ err = stmpe_reg_write(stmpe, reg, tmp);
+
+ return err;
+}
+EXPORT_SYMBOL(stmpe_set_bits);
+
+static ssize_t stmpe_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
+{
+ struct stmpe *stmpe = to_stmpe(cdev);
+ u8 *buf = _buf;
+ size_t i = count;
+ int err;
+
+ while (i) {
+ err = stmpe_reg_read(stmpe, offset, buf);
+ if (err)
+ return (ssize_t)err;
+ buf++;
+ i--;
+ offset++;
+ }
+
+ return count;
+}
+
+static ssize_t stmpe_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
+{
+ struct stmpe *stmpe = to_stmpe(cdev);
+ const u8 *buf = _buf;
+ size_t i = count;
+ int err;
+
+ while (i) {
+ err = stmpe_reg_write(stmpe, offset, *buf);
+ if (err)
+ return (ssize_t)err;
+ buf++;
+ i--;
+ offset++;
+ }
+
+ return count;
+}
+
+static struct file_operations stmpe_fops = {
+ .lseek = dev_lseek_default,
+ .read = stmpe_read,
+ .write = stmpe_write,
+};
+
+static int stmpe_probe(struct device_d *dev)
+{
+ struct stmpe_platform_data *pdata = dev->platform_data;
+ struct stmpe *stmpe_dev;
+ struct stmpe_client_info *i2c_ci;
+
+ if (!pdata) {
+ dev_dbg(dev, "no platform data\n");
+ return -ENODEV;
+ }
+
+ stmpe_dev = xzalloc(sizeof(struct stmpe));
+ stmpe_dev->cdev.name = DRIVERNAME;
+ stmpe_dev->client = to_i2c_client(dev);
+ stmpe_dev->cdev.size = 191; /* 191 known registers */
+ stmpe_dev->cdev.dev = dev;
+ stmpe_dev->cdev.ops = &stmpe_fops;
+ stmpe_dev->pdata = pdata;
+ dev->priv = stmpe_dev;
+
+ i2c_ci = xzalloc(sizeof(struct stmpe_client_info));
+ i2c_ci->stmpe = stmpe_dev;
+ i2c_ci->read_reg = stmpe_reg_read;
+ i2c_ci->write_reg = stmpe_reg_write;
+
+ if (pdata->blocks &= STMPE_BLOCK_GPIO)
+ add_generic_device("stmpe-gpio", DEVICE_ID_DYNAMIC, NULL, 0, 0, IORESOURCE_MEM, i2c_ci);
+
+ devfs_create(&stmpe_dev->cdev);
+
+ return 0;
+}
+
+static struct driver_d stmpe_driver = {
+ .name = DRIVERNAME,
+ .probe = stmpe_probe,
+};
+
+static int stmpe_init(void)
+{
+ register_driver(&stmpe_driver);
+ return 0;
+}
+
+device_initcall(stmpe_init);
diff --git a/include/mfd/stmpe-i2c.h b/include/mfd/stmpe-i2c.h
new file mode 100644
index 0000000..5f073d2
--- /dev/null
+++ b/include/mfd/stmpe-i2c.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2012 Pengutronix
+ * Steffen Trumtrar <s.trumtrar at pengutronix.de>
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#ifndef __ASM_ARCH_STMPE_H
+#define __ASM_ARCH_STMPE_H
+
+enum stmpe_revision {
+ STMPE610,
+ STMPE801,
+ STMPE811,
+ STMPE1601,
+ STMPE2401,
+ STMPE2403,
+ STMPE_NBR_PARTS
+};
+
+enum stmpe_blocks {
+ STMPE_BLOCK_GPIO = 1 << 0,
+ STMPE_BLOCK_KEYPAD = 1 << 1,
+ STMPE_BLOCK_TOUCHSCREEN = 1 << 2,
+ STMPE_BLOCK_ADC = 1 << 3,
+ STMPE_BLOCK_PWM = 1 << 4,
+ STMPE_BLOCK_ROTATOR = 1 << 5,
+};
+
+struct stmpe_platform_data {
+ enum stmpe_revision revision;
+ enum stmpe_blocks blocks;
+ int gpio_base;
+};
+
+struct stmpe {
+ struct cdev cdev;
+ struct i2c_client *client;
+ struct stmpe_platform_data *pdata;
+};
+
+struct stmpe_client_info {
+ struct stmpe *stmpe;
+ int (*read_reg)(struct stmpe *stmpe, u32 reg, u8 *val);
+ int (*write_reg)(struct stmpe *stmpe, u32 reg, u8 val);
+};
+
+int stmpe_reg_read(struct stmpe *priv, u32 reg, u8 *val);
+int stmpe_reg_write(struct stmpe *priv, u32 reg, u8 val);
+int stmpe_set_bits(struct stmpe *priv, u32 reg, u8 mask, u8 val);
+
+#endif /* __ASM_ARCH_STMPE_H */
--
1.7.10.4
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