280 lines
7.2 KiB
C
280 lines
7.2 KiB
C
/*
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* drivers/hwmon/lis3lv02d_i2c.c
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*
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* Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
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* Driver is based on corresponding SPI driver written by Daniel Mack
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* (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
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*
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* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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*
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* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/pm_runtime.h>
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#include <linux/delay.h>
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#include "lis3lv02d.h"
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#define DRV_NAME "lis3lv02d_i2c"
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static const char reg_vdd[] = "Vdd";
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static const char reg_vdd_io[] = "Vdd_IO";
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static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
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{
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int ret;
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if (state == LIS3_REG_OFF) {
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ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
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lis3->regulators);
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} else {
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ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
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lis3->regulators);
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/* Chip needs time to wakeup. Not mentioned in datasheet */
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usleep_range(10000, 20000);
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}
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return ret;
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}
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static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
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{
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struct i2c_client *c = lis3->bus_priv;
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return i2c_smbus_write_byte_data(c, reg, value);
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}
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static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
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{
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struct i2c_client *c = lis3->bus_priv;
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*v = i2c_smbus_read_byte_data(c, reg);
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return 0;
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}
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static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
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u8 *v)
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{
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struct i2c_client *c = lis3->bus_priv;
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reg |= (1 << 7); /* 7th bit enables address auto incrementation */
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return i2c_smbus_read_i2c_block_data(c, reg, len, v);
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}
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static int lis3_i2c_init(struct lis3lv02d *lis3)
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{
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u8 reg;
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int ret;
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if (lis3->reg_ctrl)
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lis3_reg_ctrl(lis3, LIS3_REG_ON);
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lis3->read(lis3, WHO_AM_I, ®);
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if (reg != lis3->whoami)
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printk(KERN_ERR "lis3: power on failure\n");
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/* power up the device */
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ret = lis3->read(lis3, CTRL_REG1, ®);
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if (ret < 0)
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return ret;
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reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
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return lis3->write(lis3, CTRL_REG1, reg);
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}
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/* Default axis mapping but it can be overwritten by platform data */
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static union axis_conversion lis3lv02d_axis_map =
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{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
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static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret = 0;
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struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
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if (pdata) {
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/* Regulator control is optional */
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if (pdata->driver_features & LIS3_USE_REGULATOR_CTRL)
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lis3_dev.reg_ctrl = lis3_reg_ctrl;
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if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
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(i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_I2C_BLOCK)))
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lis3_dev.blkread = lis3_i2c_blockread;
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if (pdata->axis_x)
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lis3lv02d_axis_map.x = pdata->axis_x;
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if (pdata->axis_y)
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lis3lv02d_axis_map.y = pdata->axis_y;
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if (pdata->axis_z)
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lis3lv02d_axis_map.z = pdata->axis_z;
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if (pdata->setup_resources)
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ret = pdata->setup_resources();
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if (ret)
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goto fail;
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}
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if (lis3_dev.reg_ctrl) {
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lis3_dev.regulators[0].supply = reg_vdd;
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lis3_dev.regulators[1].supply = reg_vdd_io;
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ret = regulator_bulk_get(&client->dev,
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ARRAY_SIZE(lis3_dev.regulators),
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lis3_dev.regulators);
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if (ret < 0)
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goto fail;
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}
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lis3_dev.pdata = pdata;
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lis3_dev.bus_priv = client;
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lis3_dev.init = lis3_i2c_init;
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lis3_dev.read = lis3_i2c_read;
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lis3_dev.write = lis3_i2c_write;
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lis3_dev.irq = client->irq;
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lis3_dev.ac = lis3lv02d_axis_map;
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lis3_dev.pm_dev = &client->dev;
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i2c_set_clientdata(client, &lis3_dev);
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/* Provide power over the init call */
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if (lis3_dev.reg_ctrl)
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lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
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ret = lis3lv02d_init_device(&lis3_dev);
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if (lis3_dev.reg_ctrl)
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lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
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if (ret == 0)
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return 0;
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fail:
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if (pdata && pdata->release_resources)
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pdata->release_resources();
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return ret;
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}
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static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
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{
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struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
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if (pdata && pdata->release_resources)
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pdata->release_resources();
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lis3lv02d_joystick_disable();
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lis3lv02d_remove_fs(&lis3_dev);
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if (lis3_dev.reg_ctrl)
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regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
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lis3_dev.regulators);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int lis3lv02d_i2c_suspend(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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if (!lis3->pdata || !lis3->pdata->wakeup_flags)
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lis3lv02d_poweroff(lis3);
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return 0;
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}
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static int lis3lv02d_i2c_resume(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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/*
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* pm_runtime documentation says that devices should always
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* be powered on at resume. Pm_runtime turns them off after system
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* wide resume is complete.
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*/
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if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
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pm_runtime_suspended(dev))
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lis3lv02d_poweron(lis3);
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return 0;
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}
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM_RUNTIME
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static int lis3_i2c_runtime_suspend(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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lis3lv02d_poweroff(lis3);
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return 0;
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}
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static int lis3_i2c_runtime_resume(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct lis3lv02d *lis3 = i2c_get_clientdata(client);
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lis3lv02d_poweron(lis3);
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return 0;
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}
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#endif /* CONFIG_PM_RUNTIME */
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static const struct i2c_device_id lis3lv02d_id[] = {
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{"lis3lv02d", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
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static const struct dev_pm_ops lis3_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
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lis3lv02d_i2c_resume)
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SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
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lis3_i2c_runtime_resume,
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NULL)
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};
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static struct i2c_driver lis3lv02d_i2c_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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.pm = &lis3_pm_ops,
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},
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.probe = lis3lv02d_i2c_probe,
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.remove = __devexit_p(lis3lv02d_i2c_remove),
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.id_table = lis3lv02d_id,
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};
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static int __init lis3lv02d_init(void)
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{
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return i2c_add_driver(&lis3lv02d_i2c_driver);
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}
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static void __exit lis3lv02d_exit(void)
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{
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i2c_del_driver(&lis3lv02d_i2c_driver);
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}
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MODULE_AUTHOR("Nokia Corporation");
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MODULE_DESCRIPTION("lis3lv02d I2C interface");
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MODULE_LICENSE("GPL");
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module_init(lis3lv02d_init);
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module_exit(lis3lv02d_exit);
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