1 files changed, 279 insertions, 0 deletions

diff --git a/drivers/misc/lis3lv02d/lis3lv02d_i2c.c b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
new file mode 100644
index 000000000000..b20dfb4522d2
--- /dev/null
+++ b/drivers/misc/lis3lv02d/lis3lv02d_i2c.c
@@ -0,0 +1,279 @@
+/*
+ * 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 <linux/pm_runtime.h>
+#include <linux/delay.h>
+#include "lis3lv02d.h"
+
+#define DRV_NAME        "lis3lv02d_i2c"
+
+static const char reg_vdd[]    = "Vdd";
+static const char reg_vdd_io[] = "Vdd_IO";
+
+static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
+{
+        int ret;
+        if (state == LIS3_REG_OFF) {
+                ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
+                                        lis3->regulators);
+        } else {
+                ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
+                                        lis3->regulators);
+                /* Chip needs time to wakeup. Not mentioned in datasheet */
+                usleep_range(10000, 20000);
+        }
+        return ret;
+}
+
+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 inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
+                                u8 *v)
+{
+        struct i2c_client *c = lis3->bus_priv;
+        reg |= (1 << 7); /* 7th bit enables address auto incrementation */
+        return i2c_smbus_read_i2c_block_data(c, reg, len, v);
+}
+
+static int lis3_i2c_init(struct lis3lv02d *lis3)
+{
+        u8 reg;
+        int ret;
+
+        if (lis3->reg_ctrl)
+                lis3_reg_ctrl(lis3, LIS3_REG_ON);
+
+        lis3->read(lis3, WHO_AM_I, &reg);
+        if (reg != lis3->whoami)
+                printk(KERN_ERR "lis3: power on failure\n");
+
+        /* power up the device */
+        ret = lis3->read(lis3, CTRL_REG1, &reg);
+        if (ret < 0)
+                return ret;
+
+        reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
+        return lis3->write(lis3, CTRL_REG1, reg);
+}
+
+/* Default axis mapping but it can be overwritten by platform data */
+static union axis_conversion lis3lv02d_axis_map =
+        { .as_array = { 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) {
+                /* Regulator control is optional */
+                if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
+                        lis3_dev.reg_ctrl = lis3_reg_ctrl;
+
+                if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
+                        (i2c_check_functionality(client->adapter,
+                                                I2C_FUNC_SMBUS_I2C_BLOCK)))
+                        lis3_dev.blkread  = lis3_i2c_blockread;
+
+                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;
+        }
+
+        if (lis3_dev.reg_ctrl) {
+                lis3_dev.regulators[0].supply = reg_vdd;
+                lis3_dev.regulators[1].supply = reg_vdd_io;
+                ret = regulator_bulk_get(&client->dev,
+                                        ARRAY_SIZE(lis3_dev.regulators),
+                                        lis3_dev.regulators);
+                if (ret < 0)
+                        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;
+        lis3_dev.pm_dev   = &client->dev;
+
+        i2c_set_clientdata(client, &lis3_dev);
+
+        /* Provide power over the init call */
+        if (lis3_dev.reg_ctrl)
+                lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
+
+        ret = lis3lv02d_init_device(&lis3_dev);
+
+        if (lis3_dev.reg_ctrl)
+                lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
+
+        if (ret == 0)
+                return 0;
+fail:
+        if (pdata && pdata->release_resources)
+                pdata->release_resources();
+        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_remove_fs(&lis3_dev);
+
+        if (lis3_dev.reg_ctrl)
+                regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
+                                lis3_dev.regulators);
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int lis3lv02d_i2c_suspend(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        if (!lis3->pdata || !lis3->pdata->wakeup_flags)
+                lis3lv02d_poweroff(lis3);
+        return 0;
+}
+
+static int lis3lv02d_i2c_resume(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        /*
+         * pm_runtime documentation says that devices should always
+         * be powered on at resume. Pm_runtime turns them off after system
+         * wide resume is complete.
+         */
+        if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
+                pm_runtime_suspended(dev))
+                lis3lv02d_poweron(lis3);
+
+        return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_RUNTIME
+static int lis3_i2c_runtime_suspend(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        lis3lv02d_poweroff(lis3);
+        return 0;
+}
+
+static int lis3_i2c_runtime_resume(struct device *dev)
+{
+        struct i2c_client *client = container_of(dev, struct i2c_client, dev);
+        struct lis3lv02d *lis3 = i2c_get_clientdata(client);
+
+        lis3lv02d_poweron(lis3);
+        return 0;
+}
+#endif /* CONFIG_PM_RUNTIME */
+
+static const struct i2c_device_id lis3lv02d_id[] = {
+        {"lis3lv02d", 0 },
+        {}
+};
+
+MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
+
+static const struct dev_pm_ops lis3_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
+                                lis3lv02d_i2c_resume)
+        SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
+                           lis3_i2c_runtime_resume,
+                           NULL)
+};
+
+static struct i2c_driver lis3lv02d_i2c_driver = {
+        .driver  = {
+                .name   = DRV_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &lis3_pm_ops,
+        },
+        .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);