174 lines
3.8 KiB
C
Executable File
174 lines
3.8 KiB
C
Executable File
/*
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* STMicroelectronics LIS2DS driver
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*
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* Copyright 2015 STMicroelectronics Inc.
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*
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* Giuseppe Barba <giuseppe.barba@st.com>
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* v.1.1.0
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* Licensed under the GPL-2.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/hrtimer.h>
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#include <linux/input.h>
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#include <linux/types.h>
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#include "lis2ds_core.h"
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static int lis2ds_i2c_read(struct lis2ds_data *cdata, u8 reg_addr, int len,
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u8 *data, bool b_lock)
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{
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int err = 0;
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struct i2c_msg msg[2];
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struct i2c_client *client = to_i2c_client(cdata->dev);
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msg[0].addr = client->addr;
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msg[0].flags = client->flags;
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msg[0].len = 1;
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msg[0].buf = ®_addr;
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msg[1].addr = client->addr;
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msg[1].flags = client->flags | I2C_M_RD;
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msg[1].len = len;
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msg[1].buf = data;
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if (b_lock) {
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mutex_lock(&cdata->bank_registers_lock);
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err = i2c_transfer(client->adapter, msg, 2);
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mutex_unlock(&cdata->bank_registers_lock);
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} else
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err = i2c_transfer(client->adapter, msg, 2);
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return err;
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}
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static int lis2ds_i2c_write(struct lis2ds_data *cdata, u8 reg_addr, int len,
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u8 *data, bool b_lock)
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{
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int err = 0;
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u8 send[len + 1];
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struct i2c_msg msg;
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struct i2c_client *client = to_i2c_client(cdata->dev);
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send[0] = reg_addr;
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memcpy(&send[1], data, len * sizeof(u8));
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len++;
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msg.addr = client->addr;
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msg.flags = client->flags;
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msg.len = len;
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msg.buf = send;
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if (b_lock) {
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mutex_lock(&cdata->bank_registers_lock);
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err = i2c_transfer(client->adapter, &msg, 1);
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mutex_unlock(&cdata->bank_registers_lock);
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} else
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err = i2c_transfer(client->adapter, &msg, 1);
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return err;
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}
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static const struct lis2ds_transfer_function lis2ds_tf_i2c = {
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.write = lis2ds_i2c_write,
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.read = lis2ds_i2c_read,
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};
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static int lis2ds_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 err;
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struct lis2ds_data *cdata;
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cdata = kzalloc(sizeof(*cdata), GFP_KERNEL);
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if (!cdata)
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return -ENOMEM;
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cdata->dev = &client->dev;
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cdata->name = client->name;
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cdata->tf = &lis2ds_tf_i2c;
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i2c_set_clientdata(client, cdata);
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err = lis2ds_common_probe(cdata, client->irq, BUS_I2C);
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if (err < 0)
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goto free_data;
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return 0;
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free_data:
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kfree(cdata);
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return err;
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}
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static int lis2ds_i2c_remove(struct i2c_client *client)
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{
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struct lis2ds_data *cdata = i2c_get_clientdata(client);
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lis2ds_common_remove(cdata, client->irq);
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dev_info(cdata->dev, "%s: removed\n", LIS2DS_DEV_NAME);
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kfree(cdata);
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return 0;
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}
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static void lis2ds_i2c_shutdown(struct i2c_client *client)
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{
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struct lis2ds_data *cdata = i2c_get_clientdata(client);
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lis2ds_common_shutdown(cdata);
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dev_info(cdata->dev, "%s: shutdowned\n", LIS2DS_DEV_NAME);
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}
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static int lis2ds_suspend(struct device *dev)
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{
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struct lis2ds_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
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return lis2ds_common_suspend(cdata);
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}
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static int lis2ds_resume(struct device *dev)
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{
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struct lis2ds_data *cdata = i2c_get_clientdata(to_i2c_client(dev));
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return lis2ds_common_resume(cdata);
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}
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static const struct dev_pm_ops lis2ds_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(lis2ds_suspend, lis2ds_resume)
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};
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#define LIS2DS_PM_OPS (&lis2ds_pm_ops)
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static const struct i2c_device_id lis2ds_ids[] = {
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{ LIS2DS_DEV_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lis2ds_ids);
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static const struct of_device_id lis2ds_id_table[] = {
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{ .compatible = "st,lis2ds", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, lis2ds_id_table);
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static struct i2c_driver lis2ds_i2c_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = LIS2DS_DEV_NAME,
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.pm = LIS2DS_PM_OPS,
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.of_match_table = lis2ds_id_table,
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},
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.probe = lis2ds_i2c_probe,
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.remove = lis2ds_i2c_remove,
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.shutdown = lis2ds_i2c_shutdown,
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.id_table = lis2ds_ids,
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};
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module_i2c_driver(lis2ds_i2c_driver);
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MODULE_DESCRIPTION("STMicroelectronics lis2ds i2c driver");
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MODULE_AUTHOR("Giuseppe Barba");
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MODULE_LICENSE("GPL v2");
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