diff options
| -rw-r--r-- | Documentation/hwmon/twl4030-madc-hwmon | 45 | ||||
| -rw-r--r-- | drivers/hwmon/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/twl4030-madc-hwmon.c | 157 |
4 files changed, 213 insertions, 0 deletions
diff --git a/Documentation/hwmon/twl4030-madc-hwmon b/Documentation/hwmon/twl4030-madc-hwmon new file mode 100644 index 000000000000..ef7984317cec --- /dev/null +++ b/Documentation/hwmon/twl4030-madc-hwmon @@ -0,0 +1,45 @@ +Kernel driver twl4030-madc +========================= + +Supported chips: + * Texas Instruments TWL4030 + Prefix: 'twl4030-madc' + + +Authors: + J Keerthy <j-keerthy@ti.com> + +Description +----------- + +The Texas Instruments TWL4030 is a Power Management and Audio Circuit. Among +other things it contains a 10-bit A/D converter MADC. The converter has 16 +channels which can be used in different modes. + + +See this table for the meaning of the different channels + +Channel Signal +------------------------------------------ +0 Battery type(BTYPE) +1 BCI: Battery temperature (BTEMP) +2 GP analog input +3 GP analog input +4 GP analog input +5 GP analog input +6 GP analog input +7 GP analog input +8 BCI: VBUS voltage(VBUS) +9 Backup Battery voltage (VBKP) +10 BCI: Battery charger current (ICHG) +11 BCI: Battery charger voltage (VCHG) +12 BCI: Main battery voltage (VBAT) +13 Reserved +14 Reserved +15 VRUSB Supply/Speaker left/Speaker right polarization level + + +The Sysfs nodes will represent the voltage in the units of mV, +the temperature channel shows the converted temperature in +degree celcius. The Battery charging current channel represents +battery charging current in mA. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index e4bd13b3cd8b..81131eda5544 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1047,6 +1047,16 @@ config SENSORS_TMP421 This driver can also be built as a module. If so, the module will be called tmp421. +config SENSORS_TWL4030_MADC + tristate "Texas Instruments TWL4030 MADC Hwmon" + depends on TWL4030_MADC + help + If you say yes here you get hwmon support for triton + TWL4030-MADC. + + This driver can also be built as a module. If so it will be called + twl4030-madc-hwmon. + config SENSORS_VIA_CPUTEMP tristate "VIA CPU temperature sensor" depends on X86 diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 54ca5939d028..967d0ea9447f 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -104,6 +104,7 @@ obj-$(CONFIG_SENSORS_THMC50) += thmc50.o obj-$(CONFIG_SENSORS_TMP102) += tmp102.o obj-$(CONFIG_SENSORS_TMP401) += tmp401.o obj-$(CONFIG_SENSORS_TMP421) += tmp421.o +obj-$(CONFIG_SENSORS_TWL4030_MADC)+= twl4030-madc-hwmon.o obj-$(CONFIG_SENSORS_VIA_CPUTEMP)+= via-cputemp.o obj-$(CONFIG_SENSORS_VIA686A) += via686a.o obj-$(CONFIG_SENSORS_VT1211) += vt1211.o diff --git a/drivers/hwmon/twl4030-madc-hwmon.c b/drivers/hwmon/twl4030-madc-hwmon.c new file mode 100644 index 000000000000..97e22bef85ab --- /dev/null +++ b/drivers/hwmon/twl4030-madc-hwmon.c @@ -0,0 +1,157 @@ +/* + * + * TWL4030 MADC Hwmon driver-This driver monitors the real time + * conversion of analog signals like battery temperature, + * battery type, battery level etc. User can ask for the conversion on a + * particular channel using the sysfs nodes. + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ + * J Keerthy <j-keerthy@ti.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/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/i2c/twl.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/i2c/twl4030-madc.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/stddef.h> +#include <linux/sysfs.h> +#include <linux/err.h> +#include <linux/types.h> + +/* + * sysfs hook function + */ +static ssize_t madc_read(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + struct twl4030_madc_request req; + long val; + + req.channels = (1 << attr->index); + req.method = TWL4030_MADC_SW2; + req.func_cb = NULL; + val = twl4030_madc_conversion(&req); + if (val < 0) + return val; + + return sprintf(buf, "%d\n", req.rbuf[attr->index]); +} + +/* sysfs nodes to read individual channels from user side */ +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, madc_read, NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, madc_read, NULL, 1); +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, madc_read, NULL, 2); +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, madc_read, NULL, 3); +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, madc_read, NULL, 4); +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, madc_read, NULL, 5); +static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, madc_read, NULL, 6); +static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, madc_read, NULL, 7); +static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, madc_read, NULL, 8); +static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, madc_read, NULL, 9); +static SENSOR_DEVICE_ATTR(curr10_input, S_IRUGO, madc_read, NULL, 10); +static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, madc_read, NULL, 11); +static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, madc_read, NULL, 12); +static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, madc_read, NULL, 15); + +static struct attribute *twl4030_madc_attributes[] = { + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + &sensor_dev_attr_in6_input.dev_attr.attr, + &sensor_dev_attr_in7_input.dev_attr.attr, + &sensor_dev_attr_in8_input.dev_attr.attr, + &sensor_dev_attr_in9_input.dev_attr.attr, + &sensor_dev_attr_curr10_input.dev_attr.attr, + &sensor_dev_attr_in11_input.dev_attr.attr, + &sensor_dev_attr_in12_input.dev_attr.attr, + &sensor_dev_attr_in15_input.dev_attr.attr, + NULL +}; + +static const struct attribute_group twl4030_madc_group = { + .attrs = twl4030_madc_attributes, +}; + +static int __devinit twl4030_madc_hwmon_probe(struct platform_device *pdev) +{ + int ret; + int status; + struct device *hwmon; + + ret = sysfs_create_group(&pdev->dev.kobj, &twl4030_madc_group); + if (ret) + goto err_sysfs; + hwmon = hwmon_device_register(&pdev->dev); + if (IS_ERR(hwmon)) { + dev_err(&pdev->dev, "hwmon_device_register failed.\n"); + status = PTR_ERR(hwmon); + goto err_reg; + } + + return 0; + +err_reg: + sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); +err_sysfs: + + return ret; +} + +static int __devexit twl4030_madc_hwmon_remove(struct platform_device *pdev) +{ + hwmon_device_unregister(&pdev->dev); + sysfs_remove_group(&pdev->dev.kobj, &twl4030_madc_group); + + return 0; +} + +static struct platform_driver twl4030_madc_hwmon_driver = { + .probe = twl4030_madc_hwmon_probe, + .remove = __exit_p(twl4030_madc_hwmon_remove), + .driver = { + .name = "twl4030_madc_hwmon", + .owner = THIS_MODULE, + }, +}; + +static int __init twl4030_madc_hwmon_init(void) +{ + return platform_driver_register(&twl4030_madc_hwmon_driver); +} + +module_init(twl4030_madc_hwmon_init); + +static void __exit twl4030_madc_hwmon_exit(void) +{ + platform_driver_unregister(&twl4030_madc_hwmon_driver); +} + +module_exit(twl4030_madc_hwmon_exit); + +MODULE_DESCRIPTION("TWL4030 ADC Hwmon driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("J Keerthy"); +MODULE_ALIAS("twl4030_madc_hwmon"); |