From: Jonas Fonseca <[email protected]>
Signed-off-by: Vivien Didelot <[email protected]> --- MAINTAINERS | 1 + drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/ts5500-adc.c | 481 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 493 insertions(+), 0 deletions(-) create mode 100644 drivers/hwmon/ts5500-adc.c diff --git a/MAINTAINERS b/MAINTAINERS index c0a646d..aace74a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6062,6 +6062,7 @@ F: drivers/gpio/ts5500-gpio.c F: include/linux/ts5500-gpio.h F: drivers/tty/serial/ts5500-auto485.c F: drivers/leds/leds-ts5500.c +F: drivers/hwmon/ts5500-adc.c TEGRA SUPPORT M: Colin Cross <[email protected]> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 060ef63..5070530 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1286,6 +1286,16 @@ config SENSORS_MC13783_ADC help Support for the A/D converter on MC13783 PMIC. +config SENSORS_TS5500_ADC + tristate "Technologic Systems TS-5500 ADC" + depends on TS5500_SBC + help + Support for the A/D converter on Technologic Systems TS-5500 + SBCs. + + This driver can also be built as a module. If so, the module + will be called ts5500-adc. + if ACPI comment "ACPI drivers" diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 967d0ea..9c8563d 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -114,6 +114,7 @@ obj-$(CONFIG_SENSORS_W83L785TS) += w83l785ts.o obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o +obj-$(CONFIG_SENSORS_TS5500_ADC)+= ts5500-adc.o # PMBus drivers obj-$(CONFIG_PMBUS) += pmbus_core.o diff --git a/drivers/hwmon/ts5500-adc.c b/drivers/hwmon/ts5500-adc.c new file mode 100644 index 0000000..6568e9e --- /dev/null +++ b/drivers/hwmon/ts5500-adc.c @@ -0,0 +1,481 @@ +/* + * Technologic Systems TS-5500 boards - MAX197 ADC driver + * + * Copyright (c) 2010 Savoir-faire Linux Inc. + * Jonas Fonseca <[email protected]> + * + * Portions Copyright (C) 2008 Marc Pignat <[email protected]> + * + * The driver uses direct access for communication with the ADC. + * Should work unchanged with the MAX199 chip. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/sysfs.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/mutex.h> +#include <linux/ts5xxx-sbcinfo.h> +#include <linux/slab.h> +#include <linux/io.h> + +#define MODULE_NAME "ts5500-max197" + +/* + * Control bits of A/D command + * bits 0-2: selected channel (0 - 7) + * bits 3: uni/bipolar (0 = unipolar (ie 0 to +5V)) + * (1 = bipolar (ie -5 to +5V)) + * bit 4: selected range (0 = 5v range, 1 = 10V range) + * bit 5-7: padded zero (unused) + */ +#define TS5500_MAX197_BIPOLAR 0x08 +#define TS5500_MAX197_UNIPOLAR 0x00 +#define TS5500_MAX197_RANGE_5V 0x00 /* 0 to 5V range */ +#define TS5500_MAX197_RANGE_10V 0x10 /* 0 to 10V range */ + +#define TS5500_MAX197_READ_DELAY 15 /* usec */ +#define TS5500_MAX197_READ_BUSY_MASK 0x01 +#define TS5500_MAX197_NAME "MAX197 (8 channels)" + +#define MAX197_CHANNELS_MAX 8 /* 0 to 7 channels on device */ + +#define max197_test_bit(bit, map) (test_bit(bit, map) != 0) + +/** + * struct max197_platform_data + * @name: Name of the device. + * @ioaddr: I/O address containing: + * .data: Data register for conversion reading. + * .ctrl: A/D Control Register (bit 0 = 0 when + * conversion completed). + * @read: Information about conversion reading, with: + * .delay: Delay before next conversion. + * .busy_mask: Control register bit 0 equals 1 means + * conversion is not completed yet. + * @ctrl: Data tables addressable by [polarity][range]. + * @ranges: Ranges. + * .min: Min value. + * .max: Max value. + * @scale: Polarity/Range coefficients to scale raw conversion reading. + */ +struct max197_platform_data { + const char *name; + struct { + int data; + int ctrl; + } ioaddr; + struct { + u8 delay; + u8 busy_mask; + } read; + u8 ctrl[2][2]; + struct { + int min[2][2]; + int max[2][2]; + } ranges; + int scale[2][2]; +}; + +/** + * struct max197_chip + * @hwmon_dev: The hwmon device. + * @lock: Read/Write mutex. + * @spec: The MAX197 platform data. + * @polarity: bitmap for polarity. + * @range: bitmap for range. + */ +struct max197_chip { + struct device *hwmon_dev; + struct mutex lock; + struct max197_platform_data spec; + DECLARE_BITMAP(polarity, MAX197_CHANNELS_MAX); + DECLARE_BITMAP(range, MAX197_CHANNELS_MAX); +}; + +static inline s32 max197_scale(struct max197_chip *chip, s16 raw, + int polarity, int range) +{ + s32 scaled = raw; + + scaled *= chip->spec.scale[polarity][range]; + scaled /= 10000; + + return scaled; +} + +static inline int max197_range(struct max197_chip *chip, int is_min, + int polarity, int range) +{ + if (is_min) + return chip->spec.ranges.min[polarity][range]; + return chip->spec.ranges.max[polarity][range]; +} + +static inline int max197_strtol(const char *buf, long *value, int range1, + int range2) +{ + if (strict_strtol(buf, 10, value)) + return -EINVAL; + + if (range1 < range2) + *value = SENSORS_LIMIT(*value, range1, range2); + else + *value = SENSORS_LIMIT(*value, range2, range1); + + return 0; +} + +static inline struct max197_chip *max197_get_drvdata(struct device *dev) +{ + return platform_get_drvdata(to_platform_device(dev)); +} + +/** + * max197_show_range() - Display range on user output + * + * Function called on read access on + * /sys/devices/platform/ts5500-max197/in{0,1,2,3,4,5,6,7}_{min,max} + */ +static ssize_t max197_show_range(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct max197_chip *chip = max197_get_drvdata(dev); + struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); + int is_min = attr->nr != 0; + int polarity, range; + + if (mutex_lock_interruptible(&chip->lock)) + return -ERESTARTSYS; + + polarity = max197_test_bit(attr->index, chip->polarity); + range = max197_test_bit(attr->index, chip->range); + + mutex_unlock(&chip->lock); + + return sprintf(buf, "%d\n", + max197_range(chip, is_min, polarity, range)); +} + +/** + * max197_store_range() - Write range from user input + * + * Function called on write access on + * /sys/devices/platform/ts5500-max197/in{0,1,2,3,4,5,6,7}_{min,max} + */ +static ssize_t max197_store_range(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct max197_chip *chip = max197_get_drvdata(dev); + struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr); + int is_min = attr->nr != 0; + int range1 = max197_range(chip, is_min, 0, 0); + int range2 = max197_range(chip, is_min, 1, 1); + long value; + + if (max197_strtol(buf, &value, range1, range2)) + return -EINVAL; + + if (mutex_lock_interruptible(&chip->lock)) + return -ERESTARTSYS; + + if (abs(value) > 5000) + set_bit(attr->index, chip->range); + else + clear_bit(attr->index, chip->range); + + if (is_min) { + if (value < 0) + set_bit(attr->index, chip->polarity); + else + clear_bit(attr->index, chip->polarity); + } + + mutex_unlock(&chip->lock); + + return count; +} + +/** + * max197_show_input() - Show channel input + * + * Function called on read access on + * /sys/devices/platform/ts5500-max197/in{0,1,2,3,4,5,6,7}_input + */ +static ssize_t max197_show_input(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct max197_chip *chip = max197_get_drvdata(dev); + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); + int polarity, range; + int ret; + u8 command; + + if (mutex_lock_interruptible(&chip->lock)) + return -ERESTARTSYS; + + polarity = max197_test_bit(attr->index, chip->polarity); + range = max197_test_bit(attr->index, chip->range); + + command = attr->index | chip->spec.ctrl[polarity][range]; + + outb(command, chip->spec.ioaddr.data); + + udelay(chip->spec.read.delay); + ret = inb(chip->spec.ioaddr.ctrl); + + if (ret & chip->spec.read.busy_mask) { + dev_err(dev, "device not ready (ret=0x0%x, try=%d)\n", ret, + range); + ret = -EIO; + } else { + /* LSB of conversion is at 0x196 and MSB is at 0x197 */ + u8 lsb = inb(chip->spec.ioaddr.data); + u8 msb = inb(chip->spec.ioaddr.data + 1); + s16 raw = (msb << 8) | lsb; + s32 scaled = max197_scale(chip, raw, polarity, range); + + ret = sprintf(buf, "%d\n", scaled); + } + + mutex_unlock(&chip->lock); + return ret; +} + +static ssize_t max197_show_name(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + return sprintf(buf, "%s\n", max197_get_drvdata(dev)->spec.name); +} + +#define MAX197_HWMON_CHANNEL(chan) \ + SENSOR_DEVICE_ATTR(in##chan##_input, S_IRUGO, \ + max197_show_input, NULL, chan); \ + SENSOR_DEVICE_ATTR_2(in##chan##_max, S_IRUGO | S_IWUSR, \ + max197_show_range, \ + max197_store_range, 0, chan); \ + SENSOR_DEVICE_ATTR_2(in##chan##_min, S_IRUGO | S_IWUSR, \ + max197_show_range, \ + max197_store_range, 1, chan) \ + +#define MAX197_SYSFS_CHANNEL(chan) \ + &sensor_dev_attr_in##chan##_input.dev_attr.attr, \ + &sensor_dev_attr_in##chan##_max.dev_attr.attr, \ + &sensor_dev_attr_in##chan##_min.dev_attr.attr + +static DEVICE_ATTR(name, S_IRUGO, max197_show_name, NULL); + +static MAX197_HWMON_CHANNEL(0); +static MAX197_HWMON_CHANNEL(1); +static MAX197_HWMON_CHANNEL(2); +static MAX197_HWMON_CHANNEL(3); +static MAX197_HWMON_CHANNEL(4); +static MAX197_HWMON_CHANNEL(5); +static MAX197_HWMON_CHANNEL(6); +static MAX197_HWMON_CHANNEL(7); + +static const struct attribute_group max197_sysfs_group = { + .attrs = (struct attribute *[]) { + &dev_attr_name.attr, + MAX197_SYSFS_CHANNEL(0), + MAX197_SYSFS_CHANNEL(1), + MAX197_SYSFS_CHANNEL(2), + MAX197_SYSFS_CHANNEL(3), + MAX197_SYSFS_CHANNEL(4), + MAX197_SYSFS_CHANNEL(5), + MAX197_SYSFS_CHANNEL(6), + MAX197_SYSFS_CHANNEL(7), + NULL + } +}; + +static int __devinit max197_probe(struct platform_device *pdev) +{ + struct max197_platform_data *pdata = pdev->dev.platform_data; + struct max197_chip *chip; + int ret; + + if (pdata == NULL) + return -ENODEV; + + chip = kzalloc(sizeof *chip, GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->spec = *pdata; + + mutex_init(&chip->lock); + mutex_lock(&chip->lock); + + ret = sysfs_create_group(&pdev->dev.kobj, &max197_sysfs_group); + if (ret) { + dev_err(&pdev->dev, "sysfs_create_group failed.\n"); + goto error_unlock_and_free; + } + + chip->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(chip->hwmon_dev)) { + dev_err(&pdev->dev, "hwmon_device_register failed.\n"); + ret = PTR_ERR(chip->hwmon_dev); + goto error_unregister_device; + } + + platform_set_drvdata(pdev, chip); + mutex_unlock(&chip->lock); + return 0; + +error_unregister_device: + sysfs_remove_group(&pdev->dev.kobj, &max197_sysfs_group); + +error_unlock_and_free: + mutex_unlock(&chip->lock); + kfree(chip); + return ret; +} + +static int __devexit max197_remove(struct platform_device *pdev) +{ + struct max197_chip *chip = platform_get_drvdata(pdev); + + mutex_lock(&chip->lock); + hwmon_device_unregister(chip->hwmon_dev); + sysfs_remove_group(&pdev->dev.kobj, &max197_sysfs_group); + platform_set_drvdata(pdev, NULL); + mutex_unlock(&chip->lock); + kfree(chip); + + return 0; +} + +static struct platform_driver max197_driver = { + .driver = { + .name = MODULE_NAME, + .owner = THIS_MODULE, + }, + .probe = max197_probe, + .remove = __devexit_p(max197_remove), +}; + +static void ts5500_max197_release(struct device *dev) +{ + /* noop */ +} + +static struct resource ts5500_max197_resources[] = { + { + .name = MODULE_NAME "-data", + .start = 0x196, + .end = 0x197, + .flags = IORESOURCE_IO, + }, + { + .name = MODULE_NAME "-ctrl", + .start = 0x195, + .end = 0x195, + .flags = IORESOURCE_IO, + } +}; + +static struct max197_platform_data ts5500_max197_platform_data = { + .name = TS5500_MAX197_NAME, + .ioaddr = { + .data = 0x196, + .ctrl = 0x195, + }, + .read = { + .delay = TS5500_MAX197_READ_DELAY, + .busy_mask = TS5500_MAX197_READ_BUSY_MASK, + }, + .ctrl = { + { TS5500_MAX197_UNIPOLAR | TS5500_MAX197_RANGE_5V, + TS5500_MAX197_UNIPOLAR | TS5500_MAX197_RANGE_10V }, + { TS5500_MAX197_BIPOLAR | TS5500_MAX197_RANGE_5V, + TS5500_MAX197_BIPOLAR | TS5500_MAX197_RANGE_10V }, + }, + .ranges = { + .min = { + { 0, 0 }, + { -5000, -10000 }, + }, + .max = { + { 5000, 10000 }, + { 5000, 10000 }, + }, + }, + .scale = { + { 12207, 24414 }, + { 24414, 48828 }, + }, +}; + +static struct platform_device ts5500_max197_device = { + .name = MODULE_NAME, + .id = -1, + .resource = ts5500_max197_resources, + .num_resources = ARRAY_SIZE(ts5500_max197_resources), + .dev = { + .platform_data = &ts5500_max197_platform_data, + .release = ts5500_max197_release, + }, +}; + +static int __init ts5500_max197_init(void) +{ + struct ts5xxx_sbcinfo sbcinfo; + int ret; + + ts5xxx_sbcinfo_set(&sbcinfo); + if (5500 != sbcinfo.board_id && !sbcinfo.adc) { + printk(MODULE_NAME ": Incompatible TS Board.\n"); + return -ENODEV; + } + + ret = platform_driver_register(&max197_driver); + if (ret) + goto error_out; + + ret = platform_device_register(&ts5500_max197_device); + if (ret) + goto error_device_register; + + return 0; + +error_device_register: + platform_driver_unregister(&max197_driver); +error_out: + return ret; +} +module_init(ts5500_max197_init); + +static void __exit ts5500_max197_exit(void) +{ + platform_device_unregister(&ts5500_max197_device); + platform_driver_unregister(&max197_driver); +} +module_exit(ts5500_max197_exit); + +MODULE_DESCRIPTION("TS5500 MAX197 ADC device driver"); +MODULE_AUTHOR("Jonas Fonseca <[email protected]>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ts5500-max197"); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
