1cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal/* 2cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * hmc6352.c - Honeywell Compass Driver 3cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 4cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * Copyright (C) 2009 Intel Corp 5cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 6cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 8cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * This program is free software; you can redistribute it and/or modify 9cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * it under the terms of the GNU General Public License as published by 10cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * the Free Software Foundation; version 2 of the License. 11cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 12cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * This program is distributed in the hope that it will be useful, but 13cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * WITHOUT ANY WARRANTY; without even the implied warranty of 14cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * General Public License for more details. 16cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 17cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * You should have received a copy of the GNU General Public License along 18cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * with this program; if not, write to the Free Software Foundation, Inc., 19cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 20cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 21cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal * 22cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal */ 23cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 24cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/module.h> 25cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/slab.h> 26cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/i2c.h> 27cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/err.h> 28cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/delay.h> 29cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal#include <linux/sysfs.h> 30cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 31cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic DEFINE_MUTEX(compass_mutex); 32cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 33cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic int compass_command(struct i2c_client *c, u8 cmd) 34cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 35cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal int ret = i2c_master_send(c, &cmd, 1); 36cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal if (ret < 0) 37cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal dev_warn(&c->dev, "command '%c' failed.\n", cmd); 38cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return ret; 39cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 40cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 41cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic int compass_store(struct device *dev, const char *buf, size_t count, 42cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal const char *map) 43cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 44cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal struct i2c_client *c = to_i2c_client(dev); 45cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal int ret; 46cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal unsigned long val; 47cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 48f7b41276b6b07f47c5f5212fa244385b0e3aaa30Jingoo Han ret = kstrtoul(buf, 10, &val); 49f7b41276b6b07f47c5f5212fa244385b0e3aaa30Jingoo Han if (ret) 50f7b41276b6b07f47c5f5212fa244385b0e3aaa30Jingoo Han return ret; 51cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal if (val >= strlen(map)) 52cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return -EINVAL; 53cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal mutex_lock(&compass_mutex); 54cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal ret = compass_command(c, map[val]); 55cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal mutex_unlock(&compass_mutex); 56cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal if (ret < 0) 57cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return ret; 58cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return count; 59cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 60cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 61cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic ssize_t compass_calibration_store(struct device *dev, 62cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal struct device_attribute *attr, const char *buf, size_t count) 63cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 64cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return compass_store(dev, buf, count, "EC"); 65cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 66cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 67cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic ssize_t compass_power_mode_store(struct device *dev, 68cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal struct device_attribute *attr, const char *buf, size_t count) 69cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 70cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return compass_store(dev, buf, count, "SW"); 71cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 72cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 73cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic ssize_t compass_heading_data_show(struct device *dev, 74cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal struct device_attribute *attr, char *buf) 75cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 76cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal struct i2c_client *client = to_i2c_client(dev); 77cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal unsigned char i2c_data[2]; 786f7d485e13c6c07348cf9cfd1b735fe1bcf3caa9Axel Lin int ret; 79cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 80cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal mutex_lock(&compass_mutex); 81cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal ret = compass_command(client, 'A'); 82cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal if (ret != 1) { 83cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal mutex_unlock(&compass_mutex); 84cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return ret; 85cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal } 86cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal msleep(10); /* sending 'A' cmd we need to wait for 7-10 millisecs */ 87cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal ret = i2c_master_recv(client, i2c_data, 2); 88cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal mutex_unlock(&compass_mutex); 896f7d485e13c6c07348cf9cfd1b735fe1bcf3caa9Axel Lin if (ret < 0) { 90cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal dev_warn(dev, "i2c read data cmd failed\n"); 91cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return ret; 92cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal } 93cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal ret = (i2c_data[0] << 8) | i2c_data[1]; 94cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return sprintf(buf, "%d.%d\n", ret/10, ret%10); 95cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 96cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 97cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 98cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic DEVICE_ATTR(heading0_input, S_IRUGO, compass_heading_data_show, NULL); 99cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic DEVICE_ATTR(calibration, S_IWUSR, NULL, compass_calibration_store); 100cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic DEVICE_ATTR(power_state, S_IWUSR, NULL, compass_power_mode_store); 101cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 102cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic struct attribute *mid_att_compass[] = { 103cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal &dev_attr_heading0_input.attr, 104cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal &dev_attr_calibration.attr, 105cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal &dev_attr_power_state.attr, 106cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal NULL 107cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal}; 108cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 109cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic const struct attribute_group m_compass_gr = { 110cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .name = "hmc6352", 111cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .attrs = mid_att_compass 112cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal}; 113cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 114cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic int hmc6352_probe(struct i2c_client *client, 115cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal const struct i2c_device_id *id) 116cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 117cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal int res; 118cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 119cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal res = sysfs_create_group(&client->dev.kobj, &m_compass_gr); 120cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal if (res) { 121cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal dev_err(&client->dev, "device_create_file failed\n"); 122cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return res; 123cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal } 124cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal dev_info(&client->dev, "%s HMC6352 compass chip found\n", 125cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal client->name); 126cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return 0; 127cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 128cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 129cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic int hmc6352_remove(struct i2c_client *client) 130cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal{ 131cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal sysfs_remove_group(&client->dev.kobj, &m_compass_gr); 132cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal return 0; 133cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal} 134cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 135cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic struct i2c_device_id hmc6352_id[] = { 136cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal { "hmc6352", 0 }, 137cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal { } 138cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal}; 139cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 140cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan TrisalMODULE_DEVICE_TABLE(i2c, hmc6352_id); 141cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 142cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisalstatic struct i2c_driver hmc6352_driver = { 143cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .driver = { 144cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .name = "hmc6352", 145cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal }, 146cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .probe = hmc6352_probe, 147cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .remove = hmc6352_remove, 148cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal .id_table = hmc6352_id, 149cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal}; 150cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 151a64fe2ed76614d37abb6966a67f4f39d10efba3cAxel Linmodule_i2c_driver(hmc6352_driver); 152cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan Trisal 153cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan TrisalMODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com"); 154cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan TrisalMODULE_DESCRIPTION("hmc6352 Compass Driver"); 155cfa3b24c38b58cb6acabe6441b4668e530e957afKalhan TrisalMODULE_LICENSE("GPL v2"); 156