Looks good to me, Acked-by: Jonathan Cameron <jic23@xxxxxxxxx> On 04/14/10 16:19, Alan Cox wrote: > Ripping it out of hwmon and applying the hedge trimmers to everything not > needed and we get this for drivers/misc. I've also swapped the command > codes to characters as the datasheet specifies them in ascii. > > --------------------------------8<------------------------------ > > hmc6352: Add driver for the HMC6352 compass > > From: Kalhan Trisal <kalhan.trisal@xxxxxxxxx> > > This driver will report the heading values in degrees to the sysfs interface. > The values returned are headings . e.g. 245.6 > > (Some cleanups from Alan Cox) > > Signed-off-by: Kalhan Trisal <kalhan.trisal@xxxxxxxxx> > Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx> > --- > > drivers/misc/Kconfig | 7 ++ > drivers/misc/Makefile | 1 > drivers/misc/hmc6352.c | 199 ++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 207 insertions(+), 0 deletions(-) > create mode 100644 drivers/misc/hmc6352.c > > > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig > index 2191c8d..e626bac 100644 > --- a/drivers/misc/Kconfig > +++ b/drivers/misc/Kconfig > @@ -278,6 +278,13 @@ config SENSORS_TSL2550 > This driver can also be built as a module. If so, the module > will be called tsl2550. > > +config HMC6352 > + tristate "Honeywell HMC6352 compass" > + depends on I2C > + help > + This driver provides support for the Honeywell HMC6352 compass, > + providing configuration and heading data via sysfs. > + > config EP93XX_PWM > tristate "EP93xx PWM support" > depends on ARCH_EP93XX > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile > index 208ae30..620cf0b 100644 > --- a/drivers/misc/Makefile > +++ b/drivers/misc/Makefile > @@ -26,5 +26,6 @@ obj-$(CONFIG_DS1682) += ds1682.o > obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o > obj-$(CONFIG_C2PORT) += c2port/ > obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/ > +obj-$(CONFIG_HMC6352) += hmc6352.o > obj-y += eeprom/ > obj-y += cb710/ > diff --git a/drivers/misc/hmc6352.c b/drivers/misc/hmc6352.c > new file mode 100644 > index 0000000..f4162ea > --- /dev/null > +++ b/drivers/misc/hmc6352.c > @@ -0,0 +1,199 @@ > +/* > + * hmc6352.c - Honeywell Compass Driver > + * > + * Copyright (C) 2009 Intel Corp > + * > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; version 2 of the License. > + * > + * 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., > + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. > + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > + * > + */ > + > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/slab.h> > +#include <linux/i2c.h> > +#include <linux/err.h> > +#include <linux/delay.h> > +#include <linux/sysfs.h> > + > +static ssize_t compass_calibration_store(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + struct i2c_client *client = to_i2c_client(dev); > + int ret; > + unsigned long val; > + char cmd = 'C'; /* Calibrate */ > + char cmd1 = 'E'; /* Exit calibration mode */ > + struct i2c_msg msg[] = { > + { client->addr, 0, 1, &cmd }, > + }; > + struct i2c_msg msg1[] = { > + { client->addr, 0, 1, &cmd1 }, > + }; > + > + if (strict_strtoul(buf, 10, &val)) > + return -EINVAL; > + if (val == 1) { > + ret = i2c_transfer(client->adapter, msg, 1); > + if (ret != 1) { > + dev_warn(dev, "hmc6352_comp: i2c calib start cmd failed\n"); > + return ret; > + } > + } else if (val == 2) { > + ret = i2c_transfer(client->adapter, msg1, 1); > + if (ret != 1) { > + dev_warn(dev, "hmc6352_comp: i2c calib stop cmd failed\n"); > + return ret; > + } > + } else > + return -EINVAL; > + > + return count; > +} > + > +static ssize_t compass_heading_data_show(struct device *dev, > + struct device_attribute *attr, char *buf) > +{ > + > + struct i2c_client *client = to_i2c_client(dev); > + static char cmd = 'A'; /* Get Data */ > + unsigned char i2c_data[2]; > + unsigned int ret, ret_val; > + struct i2c_msg msg[] = { > + { client->addr, 0, 1, &cmd }, > + }; > + struct i2c_msg msg1[] = { > + { client->addr, I2C_M_RD, 2, i2c_data }, > + }; > + > + ret = i2c_transfer(client->adapter, msg, 1); > + if (ret != 1) { > + dev_warn(dev, "hmc6352: i2c cmd 0x41 failed\n"); > + return ret; > + } > + msleep(10); /* sending 0x41 cmd we need to wait for 7-10 milli second*/ > + ret = i2c_transfer(client->adapter, msg1, 1); > + if (ret != 1) { > + dev_warn(dev, "hmc6352: i2c read data cmd failed\n"); > + return ret; > + } > + ret_val = i2c_data[0]; > + ret_val = ((ret_val << 8) | i2c_data[1]); > + return sprintf(buf, "%d.%d\n", ret_val/10, ret_val%10); > +} > + > +static ssize_t compass_power_mode_store(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t count) > +{ > + > + struct i2c_client *client = to_i2c_client(dev); > + unsigned long val; > + unsigned int ret; > + static char cmd = 'S'; /* Sleep mode */ > + static char cmd1 = 'W'; /* Wake up */ > + struct i2c_msg msg[] = { > + { client->addr, 0, 1, &cmd }, > + }; > + struct i2c_msg msg1[] = { > + { client->addr, 0, 1, &cmd1 }, > + }; > + > + if (strict_strtoul(buf, 10, &val)) > + return -EINVAL; > + > + if (val == 0) { > + ret = i2c_transfer(client->adapter, msg, 1); > + if (ret != 1) > + dev_warn(dev, "hmc6352: i2c cmd sleep mode failed\n"); > + } else if (val == 1) { > + ret = i2c_transfer(client->adapter, msg1, 1); > + if (ret != 1) > + dev_warn(dev, "hmc6352: i2c cmd active mode failed\n"); > + } else > + return -EINVAL; > + > + return count; > +} > + > +static DEVICE_ATTR(heading, S_IRUGO, compass_heading_data_show, NULL); > +static DEVICE_ATTR(calibration, S_IWUSR, NULL, compass_calibration_store); > +static DEVICE_ATTR(power_state, S_IWUSR, NULL, compass_power_mode_store); > + > +static struct attribute *mid_att_compass[] = { > + &dev_attr_heading.attr, > + &dev_attr_calibration.attr, > + &dev_attr_power_state.attr, > + NULL > +}; > + > +static struct attribute_group m_compass_gr = { > + .name = "hmc6352", > + .attrs = mid_att_compass > +}; > + > +static int hmc6352_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + int res; > + > + res = sysfs_create_group(&client->dev.kobj, &m_compass_gr); > + if (res) { > + dev_err(&client->dev, "hmc6352: device_create_file failed\n"); > + return res; > + } > + dev_info(&client->dev, "%s HMC6352 compass chip found\n", > + client->name); > + return 0; > +} > + > +static int hmc6352_remove(struct i2c_client *client) > +{ > + sysfs_remove_group(&client->dev.kobj, &m_compass_gr); > + return 0; > +} > + > +static struct i2c_device_id hmc6352_id[] = { > + { "hmc6352", 0 }, > + { } > +}; > + > +MODULE_DEVICE_TABLE(i2c, hmc6352_id); > + > +static struct i2c_driver hmc6352_driver = { > + .driver = { > + .name = "hmc6352", > + }, > + .probe = hmc6352_probe, > + .remove = hmc6352_remove, > + .id_table = hmc6352_id, > +}; > + > +static int __init sensor_hmc6352_init(void) > +{ > + return i2c_add_driver(&hmc6352_driver); > +} > + > +static void __exit sensor_hmc6352_exit(void) > +{ > + i2c_del_driver(&hmc6352_driver); > +} > + > +module_init(sensor_hmc6352_init); > +module_exit(sensor_hmc6352_exit); > + > +MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@xxxxxxxxx"); > +MODULE_DESCRIPTION("hmc6352 Compass Driver"); > +MODULE_LICENSE("GPL v2"); > -- > To unsubscribe from this list: send the line "unsubscribe linux-i2c" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html