[mirror_ubuntu-jammy-kernel.git] / drivers / platform / mellanox / mlxreg-io.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Mellanox register access driver
 *
 * Copyright (C) 2018 Mellanox Technologies
 * Copyright (C) 2018 Vadim Pasternak <vadimp@mellanox.com>
 */

#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_data/mlxreg.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

/* Attribute parameters. */
#define MLXREG_IO_ATT_SIZE	10
#define MLXREG_IO_ATT_NUM	48

/**
 * struct mlxreg_io_priv_data - driver's private data:
 *
 * @pdev: platform device;
 * @pdata: platform data;
 * @hwmon: hwmon device;
 * @mlxreg_io_attr: sysfs attributes array;
 * @mlxreg_io_dev_attr: sysfs sensor device attribute array;
 * @group: sysfs attribute group;
 * @groups: list of sysfs attribute group for hwmon registration;
 */
struct mlxreg_io_priv_data {
	struct platform_device *pdev;
	struct mlxreg_core_platform_data *pdata;
	struct device *hwmon;
	struct attribute *mlxreg_io_attr[MLXREG_IO_ATT_NUM + 1];
	struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM];
	struct attribute_group group;
	const struct attribute_group *groups[2];
};

static int
mlxreg_io_get_reg(void *regmap, struct mlxreg_core_data *data, u32 in_val,
		  bool rw_flag, u32 *regval)
{
	int ret;

	ret = regmap_read(regmap, data->reg, regval);
	if (ret)
		goto access_error;

	/*
	 * There are three kinds of attributes: single bit, full register's
	 * bits and bit sequence. For the first kind field mask indicates which
	 * bits are not related and field bit is set zero. For the second kind
	 * field mask is set to zero and field bit is set with all bits one.
	 * No special handling for such kind of attributes - pass value as is.
	 * For the third kind, field mask indicates which bits are related and
	 * field bit is set to the first bit number (from 1 to 32) is the bit
	 * sequence.
	 */
	if (!data->bit) {
		/* Single bit. */
		if (rw_flag) {
			/* For show: expose effective bit value as 0 or 1. */
			*regval = !!(*regval & ~data->mask);
		} else {
			/* For store: set effective bit value. */
			*regval &= data->mask;
			if (in_val)
				*regval |= ~data->mask;
		}
	} else if (data->mask) {
		/* Bit sequence. */
		if (rw_flag) {
			/* For show: mask and shift right. */
			*regval = ror32(*regval & data->mask, (data->bit - 1));
		} else {
			/* For store: shift to the position and mask. */
			in_val = rol32(in_val, data->bit - 1) & data->mask;
			/* Clear relevant bits and set them to new value. */
			*regval = (*regval & ~data->mask) | in_val;
		}
	}

access_error:
	return ret;
}

static ssize_t
mlxreg_io_attr_show(struct device *dev, struct device_attribute *attr,
		    char *buf)
{
	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	struct mlxreg_core_data *data = priv->pdata->data + index;
	u32 regval = 0;
	int ret;

	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, &regval);
	if (ret)
		goto access_error;

	return sprintf(buf, "%u\n", regval);

access_error:
	return ret;
}

static ssize_t
mlxreg_io_attr_store(struct device *dev, struct device_attribute *attr,
		     const char *buf, size_t len)
{
	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
	int index = to_sensor_dev_attr(attr)->index;
	struct mlxreg_core_data *data = priv->pdata->data + index;
	u32 input_val, regval;
	int ret;

	if (len > MLXREG_IO_ATT_SIZE)
		return -EINVAL;

	/* Convert buffer to input value. */
	ret = kstrtou32(buf, len, &input_val);
	if (ret)
		return ret;

	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, input_val, false,
				&regval);
	if (ret)
		goto access_error;

	ret = regmap_write(priv->pdata->regmap, data->reg, regval);
	if (ret)
		goto access_error;

	return len;

access_error:
	dev_err(&priv->pdev->dev, "Bus access error\n");
	return ret;
}

static struct device_attribute mlxreg_io_devattr_rw = {
	.show	= mlxreg_io_attr_show,
	.store	= mlxreg_io_attr_store,
};

static int mlxreg_io_attr_init(struct mlxreg_io_priv_data *priv)
{
	int i;

	priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
					 priv->pdata->counter,
					 sizeof(struct attribute *),
					 GFP_KERNEL);
	if (!priv->group.attrs)
		return -ENOMEM;

	for (i = 0; i < priv->pdata->counter; i++) {
		priv->mlxreg_io_attr[i] =
				&priv->mlxreg_io_dev_attr[i].dev_attr.attr;
		memcpy(&priv->mlxreg_io_dev_attr[i].dev_attr,
		       &mlxreg_io_devattr_rw, sizeof(struct device_attribute));

		/* Set attribute name as a label. */
		priv->mlxreg_io_attr[i]->name =
				devm_kasprintf(&priv->pdev->dev, GFP_KERNEL,
					       priv->pdata->data[i].label);

		if (!priv->mlxreg_io_attr[i]->name) {
			dev_err(&priv->pdev->dev, "Memory allocation failed for sysfs attribute %d.\n",
				i + 1);
			return -ENOMEM;
		}

		priv->mlxreg_io_dev_attr[i].dev_attr.attr.mode =
						priv->pdata->data[i].mode;
		priv->mlxreg_io_dev_attr[i].dev_attr.attr.name =
					priv->mlxreg_io_attr[i]->name;
		priv->mlxreg_io_dev_attr[i].index = i;
		sysfs_attr_init(&priv->mlxreg_io_dev_attr[i].dev_attr.attr);
	}

	priv->group.attrs = priv->mlxreg_io_attr;
	priv->groups[0] = &priv->group;
	priv->groups[1] = NULL;

	return 0;
}

static int mlxreg_io_probe(struct platform_device *pdev)
{
	struct mlxreg_io_priv_data *priv;
	int err;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->pdata = dev_get_platdata(&pdev->dev);
	if (!priv->pdata) {
		dev_err(&pdev->dev, "Failed to get platform data.\n");
		return -EINVAL;
	}

	priv->pdev = pdev;

	err = mlxreg_io_attr_init(priv);
	if (err) {
		dev_err(&priv->pdev->dev, "Failed to allocate attributes: %d\n",
			err);
		return err;
	}

	priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
							     "mlxreg_io",
							      priv,
							      priv->groups);
	if (IS_ERR(priv->hwmon)) {
		dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
			PTR_ERR(priv->hwmon));
		return PTR_ERR(priv->hwmon);
	}

	dev_set_drvdata(&pdev->dev, priv);

	return 0;
}

static struct platform_driver mlxreg_io_driver = {
	.driver = {
	    .name = "mlxreg-io",
	},
	.probe = mlxreg_io_probe,
};

module_platform_driver(mlxreg_io_driver);

MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox regmap I/O access driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mlxreg-io");
Commit	Line	Data
5ec4a8ac VP	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Mellanox register access driver
	4	*
	5	* Copyright (C) 2018 Mellanox Technologies
	6	* Copyright (C) 2018 Vadim Pasternak <vadimp@mellanox.com>
	7	*/
	8
	9	#include <linux/bitops.h>
	10	#include <linux/device.h>
	11	#include <linux/hwmon.h>
	12	#include <linux/hwmon-sysfs.h>
	13	#include <linux/module.h>
	14	#include <linux/of_device.h>
	15	#include <linux/platform_data/mlxreg.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regmap.h>
	18
	19	/* Attribute parameters. */
	20	#define MLXREG_IO_ATT_SIZE 10
	21	#define MLXREG_IO_ATT_NUM 48
	22
	23	/**
	24	* struct mlxreg_io_priv_data - driver's private data:
	25	*
	26	* @pdev: platform device;
	27	* @pdata: platform data;
	28	* @hwmon: hwmon device;
	29	* @mlxreg_io_attr: sysfs attributes array;
	30	* @mlxreg_io_dev_attr: sysfs sensor device attribute array;
	31	* @group: sysfs attribute group;
	32	* @groups: list of sysfs attribute group for hwmon registration;
	33	*/
	34	struct mlxreg_io_priv_data {
	35	struct platform_device *pdev;
	36	struct mlxreg_core_platform_data *pdata;
	37	struct device *hwmon;
	38	struct attribute *mlxreg_io_attr[MLXREG_IO_ATT_NUM + 1];
	39	struct sensor_device_attribute mlxreg_io_dev_attr[MLXREG_IO_ATT_NUM];
	40	struct attribute_group group;
	41	const struct attribute_group *groups[2];
	42	};
	43
	44	static int
	45	mlxreg_io_get_reg(void regmap, struct mlxreg_core_data data, u32 in_val,
	46	bool rw_flag, u32 *regval)
	47	{
	48	int ret;
	49
	50	ret = regmap_read(regmap, data->reg, regval);
	51	if (ret)
	52	goto access_error;
	53
	54	/*
	55	* There are three kinds of attributes: single bit, full register's
	56	* bits and bit sequence. For the first kind field mask indicates which
	57	* bits are not related and field bit is set zero. For the second kind
	58	* field mask is set to zero and field bit is set with all bits one.
	59	* No special handling for such kind of attributes - pass value as is.
	60	* For the third kind, field mask indicates which bits are related and
	61	* field bit is set to the first bit number (from 1 to 32) is the bit
	62	* sequence.
	63	*/
	64	if (!data->bit) {
65	/* Single bit. */
66	if (rw_flag) {
67	/* For show: expose effective bit value as 0 or 1. */
68	regval = !!(regval & ~data->mask);
69	} else {
70	/* For store: set effective bit value. */
71	*regval &= data->mask;
72	if (in_val)
73	*regval \|= ~data->mask;
74	}
75	} else if (data->mask) {
76	/* Bit sequence. */
77	if (rw_flag) {
78	/* For show: mask and shift right. */
79	regval = ror32(regval & data->mask, (data->bit - 1));
80	} else {
81	/* For store: shift to the position and mask. */
82	in_val = rol32(in_val, data->bit - 1) & data->mask;
83	/* Clear relevant bits and set them to new value. */
84	regval = (regval & ~data->mask) \| in_val;
85	}
86	}
87
88	access_error:
89	return ret;
90	}
91
92	static ssize_t
93	mlxreg_io_attr_show(struct device dev, struct device_attribute attr,
94	char *buf)
95	{
96	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
97	int index = to_sensor_dev_attr(attr)->index;
98	struct mlxreg_core_data *data = priv->pdata->data + index;
99	u32 regval = 0;
100	int ret;
101
102	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, 0, true, &regval);
103	if (ret)
104	goto access_error;
105
106	return sprintf(buf, "%u\n", regval);
107
108	access_error:
109	return ret;
110	}
111
112	static ssize_t
113	mlxreg_io_attr_store(struct device dev, struct device_attribute attr,
114	const char *buf, size_t len)
115	{
116	struct mlxreg_io_priv_data *priv = dev_get_drvdata(dev);
117	int index = to_sensor_dev_attr(attr)->index;
118	struct mlxreg_core_data *data = priv->pdata->data + index;
119	u32 input_val, regval;
120	int ret;
121
122	if (len > MLXREG_IO_ATT_SIZE)
123	return -EINVAL;
124
125	/* Convert buffer to input value. */
126	ret = kstrtou32(buf, len, &input_val);
127	if (ret)
128	return ret;
129
130	ret = mlxreg_io_get_reg(priv->pdata->regmap, data, input_val, false,
131	&regval);
132	if (ret)
133	goto access_error;
134
135	ret = regmap_write(priv->pdata->regmap, data->reg, regval);
136	if (ret)
137	goto access_error;
138
139	return len;
140
141	access_error:
142	dev_err(&priv->pdev->dev, "Bus access error\n");
143	return ret;
144	}
145
146	static struct device_attribute mlxreg_io_devattr_rw = {
147	.show = mlxreg_io_attr_show,
148	.store = mlxreg_io_attr_store,
149	};
150
151	static int mlxreg_io_attr_init(struct mlxreg_io_priv_data *priv)
152	{
153	int i;
154
e78fd3c3 KC	155	priv->group.attrs = devm_kcalloc(&priv->pdev->dev,
e78fd3c3 KC	156	priv->pdata->counter,
5ec4a8ac VP	157	sizeof(struct attribute *),
	158	GFP_KERNEL);
	159	if (!priv->group.attrs)
	160	return -ENOMEM;
	161
	162	for (i = 0; i < priv->pdata->counter; i++) {
	163	priv->mlxreg_io_attr[i] =
	164	&priv->mlxreg_io_dev_attr[i].dev_attr.attr;
	165	memcpy(&priv->mlxreg_io_dev_attr[i].dev_attr,
	166	&mlxreg_io_devattr_rw, sizeof(struct device_attribute));
	167
	168	/* Set attribute name as a label. */
	169	priv->mlxreg_io_attr[i]->name =
	170	devm_kasprintf(&priv->pdev->dev, GFP_KERNEL,
	171	priv->pdata->data[i].label);
	172
	173	if (!priv->mlxreg_io_attr[i]->name) {
	174	dev_err(&priv->pdev->dev, "Memory allocation failed for sysfs attribute %d.\n",
	175	i + 1);
	176	return -ENOMEM;
	177	}
	178
	179	priv->mlxreg_io_dev_attr[i].dev_attr.attr.mode =
	180	priv->pdata->data[i].mode;
	181	priv->mlxreg_io_dev_attr[i].dev_attr.attr.name =
	182	priv->mlxreg_io_attr[i]->name;
	183	priv->mlxreg_io_dev_attr[i].index = i;
	184	sysfs_attr_init(&priv->mlxreg_io_dev_attr[i].dev_attr.attr);
	185	}
	186
	187	priv->group.attrs = priv->mlxreg_io_attr;
	188	priv->groups[0] = &priv->group;
	189	priv->groups[1] = NULL;
	190
	191	return 0;
	192	}
	193
	194	static int mlxreg_io_probe(struct platform_device *pdev)
	195	{
	196	struct mlxreg_io_priv_data *priv;
	197	int err;
	198
	199	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	200	if (!priv)
	201	return -ENOMEM;
	202
	203	priv->pdata = dev_get_platdata(&pdev->dev);
	204	if (!priv->pdata) {
	205	dev_err(&pdev->dev, "Failed to get platform data.\n");
	206	return -EINVAL;
	207	}
	208
	209	priv->pdev = pdev;
	210
	211	err = mlxreg_io_attr_init(priv);
	212	if (err) {
	213	dev_err(&priv->pdev->dev, "Failed to allocate attributes: %d\n",
	214	err);
	215	return err;
	216	}
	217
	218	priv->hwmon = devm_hwmon_device_register_with_groups(&pdev->dev,
	219	"mlxreg_io",
	220	priv,
221	priv->groups);
222	if (IS_ERR(priv->hwmon)) {
223	dev_err(&pdev->dev, "Failed to register hwmon device %ld\n",
224	PTR_ERR(priv->hwmon));
225	return PTR_ERR(priv->hwmon);
226	}
227
228	dev_set_drvdata(&pdev->dev, priv);
229
230	return 0;
231	}
232
233	static struct platform_driver mlxreg_io_driver = {
234	.driver = {
235	.name = "mlxreg-io",
236	},
237	.probe = mlxreg_io_probe,
238	};
239
240	module_platform_driver(mlxreg_io_driver);
241
242	MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
243	MODULE_DESCRIPTION("Mellanox regmap I/O access driver");
244	MODULE_LICENSE("GPL");
245	MODULE_ALIAS("platform:mlxreg-io");