1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (c) 2012 Savoir-faire Linux Inc.
21 #include <linux/hwmon-sysfs.h>
28 #define MAX197_NUM_CH	8		/* 8 Analog Input Channels */
40  * struct max197_data - device instance specific data
46  * @ctrl_bytes:		Channels control byte.
59 	data->ctrl_bytes[channel] &= ~MAX197_BIP;  in max197_set_unipolarity()
64 	data->ctrl_bytes[channel] |= MAX197_BIP;  in max197_set_bipolarity()
69 	data->ctrl_bytes[channel] &= ~MAX197_RNG;  in max197_set_half_range()
74 	data->ctrl_bytes[channel] |= MAX197_RNG;  in max197_set_full_range()
79 	return data->ctrl_bytes[channel] & MAX197_BIP;  in max197_is_bipolar()
84 	return data->ctrl_bytes[channel] & MAX197_RNG;  in max197_is_full_range()
93 	int channel = attr->index;  in max197_show_range()
94 	bool is_min = attr->nr;  in max197_show_range()
97 	if (mutex_lock_interruptible(&data->lock))  in max197_show_range()
98 		return -ERESTARTSYS;  in max197_show_range()
101 		data->limit : data->limit / 2;  in max197_show_range()
104 			range = -range;  in max197_show_range()
109 	mutex_unlock(&data->lock);  in max197_show_range()
121 	int channel = attr->index;  in max197_store_range()
122 	bool is_min = attr->nr;  in max197_store_range()
124 	int half = data->limit / 2;  in max197_store_range()
125 	int full = data->limit;  in max197_store_range()
128 		return -EINVAL;  in max197_store_range()
131 		if (value <= -full)  in max197_store_range()
132 			value = -full;  in max197_store_range()
134 			value = -half;  in max197_store_range()
144 	if (mutex_lock_interruptible(&data->lock))  in max197_store_range()
145 		return -ERESTARTSYS;  in max197_store_range()
150 	} else if (value == -half) {  in max197_store_range()
153 	} else if (value == -full) {  in max197_store_range()
164 	mutex_unlock(&data->lock);  in max197_store_range()
176 	int channel = attr->index;  in max197_show_input()
180 	if (mutex_lock_interruptible(&data->lock))  in max197_show_input()
181 		return -ERESTARTSYS;  in max197_show_input()
183 	ret = data->pdata->convert(data->ctrl_bytes[channel]);  in max197_show_input()
194 	if (data->scale) {  in max197_show_input()
204 	mutex_unlock(&data->lock);  in max197_show_input()
212 	return sprintf(buf, "%s\n", pdev->name);  in name_show()
262 	struct max197_platform_data *pdata = dev_get_platdata(&pdev->dev);  in max197_probe()
263 	enum max197_chips chip = platform_get_device_id(pdev)->driver_data;  in max197_probe()
266 		dev_err(&pdev->dev, "no platform data supplied\n");  in max197_probe()
267 		return -EINVAL;  in max197_probe()
270 	if (pdata->convert == NULL) {  in max197_probe()
271 		dev_err(&pdev->dev, "no convert function supplied\n");  in max197_probe()
272 		return -EINVAL;  in max197_probe()
275 	data = devm_kzalloc(&pdev->dev, sizeof(struct max197_data), GFP_KERNEL);  in max197_probe()
277 		return -ENOMEM;  in max197_probe()
279 	data->pdata = pdata;  in max197_probe()
280 	mutex_init(&data->lock);  in max197_probe()
283 		data->limit = MAX197_LIMIT;  in max197_probe()
284 		data->scale = true;  in max197_probe()
286 		data->limit = MAX199_LIMIT;  in max197_probe()
287 		data->scale = false;  in max197_probe()
291 		data->ctrl_bytes[ch] = (u8) ch;  in max197_probe()
295 	ret = sysfs_create_group(&pdev->dev.kobj, &max197_sysfs_group);  in max197_probe()
297 		dev_err(&pdev->dev, "sysfs create group failed\n");  in max197_probe()
301 	data->hwmon_dev = hwmon_device_register(&pdev->dev);  in max197_probe()
302 	if (IS_ERR(data->hwmon_dev)) {  in max197_probe()
303 		ret = PTR_ERR(data->hwmon_dev);  in max197_probe()
304 		dev_err(&pdev->dev, "hwmon device register failed\n");  in max197_probe()
311 	sysfs_remove_group(&pdev->dev.kobj, &max197_sysfs_group);  in max197_probe()
319 	hwmon_device_unregister(data->hwmon_dev);  in max197_remove()
320 	sysfs_remove_group(&pdev->dev.kobj, &max197_sysfs_group);  in max197_remove()
341 MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");