hwmon: I2C bus support for lis3lv02d and variant accelerometer chips

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Éric Piel <eric.piel@tremplin-utc.net>
Cc: Kalhan Trisal <kalhan.trisal@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 201 insertions, 0 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 95ccbe377f9c..bf28945c610d 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -998,6 +998,23 @@ config SENSORS_LIS3_SPI
           will be called lis3lv02d and a specific module for the SPI transport
           is called lis3lv02d_spi.
 
+config SENSORS_LIS3_I2C
+        tristate "STMicroeletronics LIS3LV02Dx three-axis digital accelerometer (I2C)"
+        depends on I2C && INPUT
+        select INPUT_POLLDEV
+        default n
+        help
+          This driver provides support for the LIS3LV02Dx accelerometer connected
+          via I2C. The accelerometer data is readable via
+          /sys/devices/platform/lis3lv02d.
+
+          This driver also provides an absolute input class device, allowing
+          the device to act as a pinball machine-esque joystick.
+
+          This driver can also be built as modules.  If so, the core module
+          will be called lis3lv02d and a specific module for the I2C transport
+          is called lis3lv02d_i2c.
+
 config SENSORS_APPLESMC
         tristate "Apple SMC (Motion sensor, light sensor, keyboard backlight)"
         depends on INPUT && X86
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 33c2ee105284..4131e253f96a 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_IT87)	+= it87.o
 obj-$(CONFIG_SENSORS_K8TEMP)    += k8temp.o
 obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
 obj-$(CONFIG_SENSORS_LIS3_SPI)  += lis3lv02d.o lis3lv02d_spi.o
+obj-$(CONFIG_SENSORS_LIS3_I2C)  += lis3lv02d.o lis3lv02d_i2c.o
 obj-$(CONFIG_SENSORS_LM63)      += lm63.o
 obj-$(CONFIG_SENSORS_LM70)      += lm70.o
 obj-$(CONFIG_SENSORS_LM73)      += lm73.o
diff --git a/drivers/hwmon/lis3lv02d_i2c.c b/drivers/hwmon/lis3lv02d_i2c.c
new file mode 100644
index 000000000000..dc1f5402c1d7
--- /dev/null
+++ b/drivers/hwmon/lis3lv02d_i2c.c
@@ -0,0 +1,183 @@
+/*
+ * drivers/hwmon/lis3lv02d_i2c.c
+ *
+ * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
+ * Driver is based on corresponding SPI driver written by Daniel Mack
+ * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
+ *
+ * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Samu Onkalo <samu.p.onkalo@nokia.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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include "lis3lv02d.h"
+
+#define DRV_NAME        "lis3lv02d_i2c"
+
+static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
+{
+        struct i2c_client *c = lis3->bus_priv;
+        return i2c_smbus_write_byte_data(c, reg, value);
+}
+
+static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
+{
+        struct i2c_client *c = lis3->bus_priv;
+        *v = i2c_smbus_read_byte_data(c, reg);
+        return 0;
+}
+
+static int lis3_i2c_init(struct lis3lv02d *lis3)
+{
+        u8 reg;
+        int ret;
+
+        /* power up the device */
+        ret = lis3->read(lis3, CTRL_REG1, &reg);
+        if (ret < 0)
+                return ret;
+
+        reg |= CTRL1_PD0;
+        return lis3->write(lis3, CTRL_REG1, reg);
+}
+
+/* Default axis mapping but it can be overwritten by platform data */
+static struct axis_conversion lis3lv02d_axis_map = { LIS3_DEV_X,
+                                                     LIS3_DEV_Y,
+                                                     LIS3_DEV_Z };
+
+static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        int ret = 0;
+        struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
+
+        if (pdata) {
+                if (pdata->axis_x)
+                        lis3lv02d_axis_map.x = pdata->axis_x;
+
+                if (pdata->axis_y)
+                        lis3lv02d_axis_map.y = pdata->axis_y;
+
+                if (pdata->axis_z)
+                        lis3lv02d_axis_map.z = pdata->axis_z;
+
+                if (pdata->setup_resources)
+                        ret = pdata->setup_resources();
+
+                if (ret)
+                        goto fail;
+        }
+
+        lis3_dev.pdata    = pdata;
+        lis3_dev.bus_priv = client;
+        lis3_dev.init     = lis3_i2c_init;
+        lis3_dev.read     = lis3_i2c_read;
+        lis3_dev.write    = lis3_i2c_write;
+        lis3_dev.irq      = client->irq;
+        lis3_dev.ac       = lis3lv02d_axis_map;
+
+        i2c_set_clientdata(client, &lis3_dev);
+        ret = lis3lv02d_init_device(&lis3_dev);
+fail:
+        return ret;
+}
+
+static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
+{
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+        struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
+
+        if (pdata && pdata->release_resources)
+                pdata->release_resources();
+
+        lis3lv02d_joystick_disable();
+        lis3lv02d_poweroff(lis3);
+
+        return lis3lv02d_remove_fs(&lis3_dev);
+}
+
+#ifdef CONFIG_PM
+static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        if (!lis3->pdata->wakeup_flags)
+                lis3lv02d_poweroff(lis3);
+        return 0;
+}
+
+static int lis3lv02d_i2c_resume(struct i2c_client *client)
+{
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        if (!lis3->pdata->wakeup_flags)
+                lis3lv02d_poweron(lis3);
+        return 0;
+}
+
+static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
+{
+        lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
+}
+#else
+#define lis3lv02d_i2c_suspend   NULL
+#define lis3lv02d_i2c_resume    NULL
+#define lis3lv02d_i2c_shutdown  NULL
+#endif
+
+static const struct i2c_device_id lis3lv02d_id[] = {
+        {"lis3lv02d", 0 },
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
+
+static struct i2c_driver lis3lv02d_i2c_driver = {
+        .driver  = {
+                .name   = DRV_NAME,
+                .owner  = THIS_MODULE,
+        },
+        .suspend = lis3lv02d_i2c_suspend,
+        .shutdown = lis3lv02d_i2c_shutdown,
+        .resume = lis3lv02d_i2c_resume,
+        .probe  = lis3lv02d_i2c_probe,
+        .remove = __devexit_p(lis3lv02d_i2c_remove),
+        .id_table = lis3lv02d_id,
+};
+
+static int __init lis3lv02d_init(void)
+{
+        return i2c_add_driver(&lis3lv02d_i2c_driver);
+}
+
+static void __exit lis3lv02d_exit(void)
+{
+        i2c_del_driver(&lis3lv02d_i2c_driver);
+}
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_DESCRIPTION("lis3lv02d I2C interface");
+MODULE_LICENSE("GPL");
+
+module_init(lis3lv02d_init);
+module_exit(lis3lv02d_exit);