/* * Driver for the Freescale Semiconductor MC13783 adc. * * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright (C) 2009 Sascha Hauer, Pengutronix * * 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., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #define MC13783_ADC_NAME "mc13783-adc" struct mc13783_adc_priv { struct mc13783 *mc13783; struct device *hwmon_dev; }; static ssize_t mc13783_adc_show_name(struct device *dev, struct device_attribute *devattr, char *buf) { return sprintf(buf, "mc13783_adc\n"); } static int mc13783_adc_read(struct device *dev, struct device_attribute *devattr, unsigned int *val) { struct platform_device *pdev = to_platform_device(dev); struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); unsigned int channel = attr->index; unsigned int sample[4]; int ret; ret = mc13783_adc_do_conversion(priv->mc13783, MC13783_ADC_MODE_MULT_CHAN, channel, sample); if (ret) return ret; channel &= 0x7; *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; return 0; } static ssize_t mc13783_adc_read_bp(struct device *dev, struct device_attribute *devattr, char *buf) { unsigned val; int ret = mc13783_adc_read(dev, devattr, &val); if (ret) return ret; /* * BP (channel 2) reports with offset 2.4V to the actual value to fit * the input range of the ADC. unit = 2.25mV = 9/4 mV. */ val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400; return sprintf(buf, "%u\n", val); } static ssize_t mc13783_adc_read_gp(struct device *dev, struct device_attribute *devattr, char *buf) { unsigned val; int ret = mc13783_adc_read(dev, devattr, &val); if (ret) return ret; /* * input range is [0, 2.3V], val has 10 bits, so each bit * is worth 9/4 mV. */ val = DIV_ROUND_CLOSEST(val * 9, 4); return sprintf(buf, "%u\n", val); } static DEVICE_ATTR(name, S_IRUGO, mc13783_adc_show_name, NULL); static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2); static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5); static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6); static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7); static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8); static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9); static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10); static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11); static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12); static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13); static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14); static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15); static struct attribute *mc13783_attr[] = { &dev_attr_name.attr, &sensor_dev_attr_in2_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_in10_input.dev_attr.attr, &sensor_dev_attr_in11_input.dev_attr.attr, NULL }; static const struct attribute_group mc13783_group = { .attrs = mc13783_attr, }; /* last four channels may be occupied by the touchscreen */ static struct attribute *mc13783_attr_ts[] = { &sensor_dev_attr_in12_input.dev_attr.attr, &sensor_dev_attr_in13_input.dev_attr.attr, &sensor_dev_attr_in14_input.dev_attr.attr, &sensor_dev_attr_in15_input.dev_attr.attr, NULL }; static const struct attribute_group mc13783_group_ts = { .attrs = mc13783_attr_ts, }; static int mc13783_adc_use_touchscreen(struct platform_device *pdev) { struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); unsigned flags = mc13783_get_flags(priv->mc13783); return flags & MC13783_USE_TOUCHSCREEN; } static int __init mc13783_adc_probe(struct platform_device *pdev) { struct mc13783_adc_priv *priv; int ret; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->mc13783 = dev_get_drvdata(pdev->dev.parent); platform_set_drvdata(pdev, priv); /* Register sysfs hooks */ ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group); if (ret) goto out_err_create1; if (!mc13783_adc_use_touchscreen(pdev)) { ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); if (ret) goto out_err_create2; } priv->hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(priv->hwmon_dev)) { ret = PTR_ERR(priv->hwmon_dev); dev_err(&pdev->dev, "hwmon_device_register failed with %d.\n", ret); goto out_err_register; } return 0; out_err_register: if (!mc13783_adc_use_touchscreen(pdev)) sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); out_err_create2: sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); out_err_create1: platform_set_drvdata(pdev, NULL); kfree(priv); return ret; } static int __devexit mc13783_adc_remove(struct platform_device *pdev) { struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); hwmon_device_unregister(priv->hwmon_dev); if (!mc13783_adc_use_touchscreen(pdev)) sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); sysfs_remove_group(&pdev->dev.kobj, &mc13783_group); platform_set_drvdata(pdev, NULL); kfree(priv); return 0; } static struct platform_driver mc13783_adc_driver = { .remove = __devexit_p(mc13783_adc_remove), .driver = { .owner = THIS_MODULE, .name = MC13783_ADC_NAME, }, }; static int __init mc13783_adc_init(void) { return platform_driver_probe(&mc13783_adc_driver, mc13783_adc_probe); } static void __exit mc13783_adc_exit(void) { platform_driver_unregister(&mc13783_adc_driver); } module_init(mc13783_adc_init); module_exit(mc13783_adc_exit); MODULE_DESCRIPTION("MC13783 ADC driver"); MODULE_AUTHOR("Luotao Fu "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" MC13783_ADC_NAME);