[linux-2.6-block.git] / drivers / pinctrl / pinctrl-mcp23s08_spi.c

// SPDX-License-Identifier: GPL-2.0-only
/* MCP23S08 SPI GPIO driver */

#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

#include "pinctrl-mcp23s08.h"

#define MCP_MAX_DEV_PER_CS	8

/*
 * A given spi_device can represent up to eight mcp23sxx chips
 * sharing the same chipselect but using different addresses
 * (e.g. chips #0 and #3 might be populated, but not #1 or #2).
 * Driver data holds all the per-chip data.
 */
struct mcp23s08_driver_data {
	unsigned		ngpio;
	struct mcp23s08		*mcp[8];
	struct mcp23s08		chip[];
};

static int mcp23sxx_spi_write(void *context, const void *data, size_t count)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	struct spi_message m;
	struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
				     { .tx_buf = data, .len = count, }, };

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);

	return spi_sync(spi, &m);
}

static int mcp23sxx_spi_gather_write(void *context,
				const void *reg, size_t reg_size,
				const void *val, size_t val_size)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	struct spi_message m;
	struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
				     { .tx_buf = reg, .len = reg_size, },
				     { .tx_buf = val, .len = val_size, }, };

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);
	spi_message_add_tail(&t[2], &m);

	return spi_sync(spi, &m);
}

static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
				void *val, size_t val_size)
{
	struct mcp23s08 *mcp = context;
	struct spi_device *spi = to_spi_device(mcp->dev);
	u8 tx[2];

	if (reg_size != 1)
		return -EINVAL;

	tx[0] = mcp->addr | 0x01;
	tx[1] = *((u8 *) reg);

	return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
}

static const struct regmap_bus mcp23sxx_spi_regmap = {
	.write = mcp23sxx_spi_write,
	.gather_write = mcp23sxx_spi_gather_write,
	.read = mcp23sxx_spi_read,
};

static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
				    unsigned int addr, unsigned int type)
{
	const struct regmap_config *config;
	struct regmap_config *copy;
	const char *name;

	switch (type) {
	case MCP_TYPE_S08:
		mcp->reg_shift = 0;
		mcp->chip.ngpio = 8;
		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d", addr);
		if (!mcp->chip.label)
			return -ENOMEM;

		config = &mcp23x08_regmap;
		name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
		if (!name)
			return -ENOMEM;

		break;

	case MCP_TYPE_S17:
		mcp->reg_shift = 1;
		mcp->chip.ngpio = 16;
		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d", addr);
		if (!mcp->chip.label)
			return -ENOMEM;

		config = &mcp23x17_regmap;
		name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
		if (!name)
			return -ENOMEM;

		break;

	case MCP_TYPE_S18:
		mcp->reg_shift = 1;
		mcp->chip.ngpio = 16;
		mcp->chip.label = "mcp23s18";

		config = &mcp23x17_regmap;
		name = config->name;
		break;

	default:
		dev_err(dev, "invalid device type (%d)\n", type);
		return -EINVAL;
	}

	copy = devm_kmemdup(dev, config, sizeof(*config), GFP_KERNEL);
	if (!copy)
		return -ENOMEM;

	copy->name = name;

	mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);
	if (IS_ERR(mcp->regmap))
		dev_err(dev, "regmap init failed for %s\n", mcp->chip.label);
	return PTR_ERR_OR_ZERO(mcp->regmap);
}

static int mcp23s08_probe(struct spi_device *spi)
{
	struct device *dev = &spi->dev;
	struct mcp23s08_driver_data *data;
	unsigned long spi_present_mask;
	const void *match;
	unsigned int addr;
	unsigned int ngpio = 0;
	int chips;
	int type;
	int ret;
	u32 v;

	match = device_get_match_data(dev);
	if (match)
		type = (int)(uintptr_t)match;
	else
		type = spi_get_device_id(spi)->driver_data;

	ret = device_property_read_u32(dev, "microchip,spi-present-mask", &v);
	if (ret) {
		ret = device_property_read_u32(dev, "mcp,spi-present-mask", &v);
		if (ret) {
			dev_err(dev, "missing spi-present-mask");
			return ret;
		}
	}
	spi_present_mask = v;

	if (!spi_present_mask || spi_present_mask >= BIT(MCP_MAX_DEV_PER_CS)) {
		dev_err(dev, "invalid spi-present-mask");
		return -ENODEV;
	}

	chips = hweight_long(spi_present_mask);

	data = devm_kzalloc(dev, struct_size(data, chip, chips), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	spi_set_drvdata(spi, data);

	for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
		data->mcp[addr] = &data->chip[--chips];
		data->mcp[addr]->irq = spi->irq;

		ret = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, type);
		if (ret)
			return ret;

		data->mcp[addr]->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
								    "mcp23xxx-pinctrl.%d",
								    addr);
		if (!data->mcp[addr]->pinctrl_desc.name)
			return -ENOMEM;

		ret = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 | (addr << 1), type, -1);
		if (ret < 0)
			return ret;

		ngpio += data->mcp[addr]->chip.ngpio;
	}
	data->ngpio = ngpio;

	return 0;
}

static const struct spi_device_id mcp23s08_ids[] = {
	{ "mcp23s08", MCP_TYPE_S08 },
	{ "mcp23s17", MCP_TYPE_S17 },
	{ "mcp23s18", MCP_TYPE_S18 },
	{ }
};
MODULE_DEVICE_TABLE(spi, mcp23s08_ids);

static const struct of_device_id mcp23s08_spi_of_match[] = {
	{
		.compatible = "microchip,mcp23s08",
		.data = (void *) MCP_TYPE_S08,
	},
	{
		.compatible = "microchip,mcp23s17",
		.data = (void *) MCP_TYPE_S17,
	},
	{
		.compatible = "microchip,mcp23s18",
		.data = (void *) MCP_TYPE_S18,
	},
/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
	{
		.compatible = "mcp,mcp23s08",
		.data = (void *) MCP_TYPE_S08,
	},
	{
		.compatible = "mcp,mcp23s17",
		.data = (void *) MCP_TYPE_S17,
	},
	{ }
};
MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);

static struct spi_driver mcp23s08_driver = {
	.probe		= mcp23s08_probe,
	.id_table	= mcp23s08_ids,
	.driver = {
		.name	= "mcp23s08",
		.of_match_table = mcp23s08_spi_of_match,
	},
};

static int __init mcp23s08_spi_init(void)
{
	return spi_register_driver(&mcp23s08_driver);
}

/*
 * Register after SPI postcore initcall and before
 * subsys initcalls that may rely on these GPIOs.
 */
subsys_initcall(mcp23s08_spi_init);

static void mcp23s08_spi_exit(void)
{
	spi_unregister_driver(&mcp23s08_driver);
}
module_exit(mcp23s08_spi_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
0f04a817 AS	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/* MCP23S08 SPI GPIO driver */
	3
	4	#include <linux/mod_devicetable.h>
	5	#include <linux/module.h>
	6	#include <linux/property.h>
	7	#include <linux/regmap.h>
	8	#include <linux/spi/spi.h>
	9
	10	#include "pinctrl-mcp23s08.h"
	11
	12	#define MCP_MAX_DEV_PER_CS 8
	13
	14	/*
	15	* A given spi_device can represent up to eight mcp23sxx chips
	16	* sharing the same chipselect but using different addresses
	17	* (e.g. chips #0 and #3 might be populated, but not #1 or #2).
	18	* Driver data holds all the per-chip data.
	19	*/
	20	struct mcp23s08_driver_data {
	21	unsigned ngpio;
	22	struct mcp23s08 *mcp[8];
	23	struct mcp23s08 chip[];
	24	};
	25
	26	static int mcp23sxx_spi_write(void context, const void data, size_t count)
	27	{
	28	struct mcp23s08 *mcp = context;
	29	struct spi_device *spi = to_spi_device(mcp->dev);
	30	struct spi_message m;
	31	struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },
	32	{ .tx_buf = data, .len = count, }, };
	33
	34	spi_message_init(&m);
	35	spi_message_add_tail(&t[0], &m);
	36	spi_message_add_tail(&t[1], &m);
	37
	38	return spi_sync(spi, &m);
	39	}
	40
	41	static int mcp23sxx_spi_gather_write(void *context,
	42	const void *reg, size_t reg_size,
	43	const void *val, size_t val_size)
	44	{
	45	struct mcp23s08 *mcp = context;
	46	struct spi_device *spi = to_spi_device(mcp->dev);
	47	struct spi_message m;
	48	struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },
	49	{ .tx_buf = reg, .len = reg_size, },
	50	{ .tx_buf = val, .len = val_size, }, };
	51
	52	spi_message_init(&m);
	53	spi_message_add_tail(&t[0], &m);
	54	spi_message_add_tail(&t[1], &m);
	55	spi_message_add_tail(&t[2], &m);
	56
	57	return spi_sync(spi, &m);
	58	}
	59
	60	static int mcp23sxx_spi_read(void context, const void reg, size_t reg_size,
	61	void *val, size_t val_size)
	62	{
	63	struct mcp23s08 *mcp = context;
	64	struct spi_device *spi = to_spi_device(mcp->dev);
65	u8 tx[2];
66
67	if (reg_size != 1)
68	return -EINVAL;
69
70	tx[0] = mcp->addr \| 0x01;
71	tx[1] = ((u8 ) reg);
72
73	return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
74	}
75
76	static const struct regmap_bus mcp23sxx_spi_regmap = {
77	.write = mcp23sxx_spi_write,
78	.gather_write = mcp23sxx_spi_gather_write,
79	.read = mcp23sxx_spi_read,
80	};
81
82	static int mcp23s08_spi_regmap_init(struct mcp23s08 mcp, struct device dev,
83	unsigned int addr, unsigned int type)
84	{
85	const struct regmap_config *config;
86	struct regmap_config *copy;
87	const char *name;
88
89	switch (type) {
90	case MCP_TYPE_S08:
91	mcp->reg_shift = 0;
92	mcp->chip.ngpio = 8;
93	mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d", addr);
f941714a CB	94	if (!mcp->chip.label)
f941714a CB	95	return -ENOMEM;
0f04a817 AS	96
	97	config = &mcp23x08_regmap;
	98	name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
f941714a CB	99	if (!name)
	100	return -ENOMEM;
	101
0f04a817 AS	102	break;
	103
	104	case MCP_TYPE_S17:
	105	mcp->reg_shift = 1;
	106	mcp->chip.ngpio = 16;
	107	mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d", addr);
f941714a CB	108	if (!mcp->chip.label)
f941714a CB	109	return -ENOMEM;
0f04a817 AS	110
	111	config = &mcp23x17_regmap;
	112	name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
f941714a CB	113	if (!name)
	114	return -ENOMEM;
	115
0f04a817 AS	116	break;
	117
	118	case MCP_TYPE_S18:
	119	mcp->reg_shift = 1;
	120	mcp->chip.ngpio = 16;
	121	mcp->chip.label = "mcp23s18";
	122
	123	config = &mcp23x17_regmap;
	124	name = config->name;
	125	break;
	126
	127	default:
	128	dev_err(dev, "invalid device type (%d)\n", type);
	129	return -EINVAL;
	130	}
	131
2b12c136	132	copy = devm_kmemdup(dev, config, sizeof(*config), GFP_KERNEL);
0f04a817 AS	133	if (!copy)
	134	return -ENOMEM;
	135
	136	copy->name = name;
	137
	138	mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);
a835d3a1 AS	139	if (IS_ERR(mcp->regmap))
a835d3a1 AS	140	dev_err(dev, "regmap init failed for %s\n", mcp->chip.label);
3e5b8f87	141	return PTR_ERR_OR_ZERO(mcp->regmap);
0f04a817 AS	142	}
	143
	144	static int mcp23s08_probe(struct spi_device *spi)
	145	{
	146	struct device *dev = &spi->dev;
	147	struct mcp23s08_driver_data *data;
	148	unsigned long spi_present_mask;
	149	const void *match;
	150	unsigned int addr;
	151	unsigned int ngpio = 0;
	152	int chips;
	153	int type;
	154	int ret;
	155	u32 v;
	156
	157	match = device_get_match_data(dev);
	158	if (match)
	159	type = (int)(uintptr_t)match;
	160	else
	161	type = spi_get_device_id(spi)->driver_data;
	162
	163	ret = device_property_read_u32(dev, "microchip,spi-present-mask", &v);
	164	if (ret) {
	165	ret = device_property_read_u32(dev, "mcp,spi-present-mask", &v);
	166	if (ret) {
	167	dev_err(dev, "missing spi-present-mask");
	168	return ret;
	169	}
	170	}
	171	spi_present_mask = v;
	172
	173	if (!spi_present_mask \|\| spi_present_mask >= BIT(MCP_MAX_DEV_PER_CS)) {
	174	dev_err(dev, "invalid spi-present-mask");
	175	return -ENODEV;
	176	}
	177
	178	chips = hweight_long(spi_present_mask);
	179
	180	data = devm_kzalloc(dev, struct_size(data, chip, chips), GFP_KERNEL);
	181	if (!data)
	182	return -ENOMEM;
	183
	184	spi_set_drvdata(spi, data);
	185
	186	for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
	187	data->mcp[addr] = &data->chip[--chips];
	188	data->mcp[addr]->irq = spi->irq;
	189
	190	ret = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, type);
	191	if (ret)
	192	return ret;
	193
	194	data->mcp[addr]->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,
	195	"mcp23xxx-pinctrl.%d",
	196	addr);
	197	if (!data->mcp[addr]->pinctrl_desc.name)
	198	return -ENOMEM;
	199
	200	ret = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 \| (addr << 1), type, -1);
	201	if (ret < 0)
	202	return ret;
	203
	204	ngpio += data->mcp[addr]->chip.ngpio;
	205	}
206	data->ngpio = ngpio;
207
208	return 0;
209	}
210
211	static const struct spi_device_id mcp23s08_ids[] = {
212	{ "mcp23s08", MCP_TYPE_S08 },
213	{ "mcp23s17", MCP_TYPE_S17 },
214	{ "mcp23s18", MCP_TYPE_S18 },
215	{ }
216	};
217	MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
218
219	static const struct of_device_id mcp23s08_spi_of_match[] = {
220	{
221	.compatible = "microchip,mcp23s08",
222	.data = (void *) MCP_TYPE_S08,
223	},
224	{
225	.compatible = "microchip,mcp23s17",
226	.data = (void *) MCP_TYPE_S17,
227	},
228	{
229	.compatible = "microchip,mcp23s18",
230	.data = (void *) MCP_TYPE_S18,
231	},
232	/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
233	{
234	.compatible = "mcp,mcp23s08",
235	.data = (void *) MCP_TYPE_S08,
236	},
237	{
238	.compatible = "mcp,mcp23s17",
239	.data = (void *) MCP_TYPE_S17,
240	},
241	{ }
242	};
243	MODULE_DEVICE_TABLE(of, mcp23s08_spi_of_match);
244
245	static struct spi_driver mcp23s08_driver = {
246	.probe = mcp23s08_probe,
247	.id_table = mcp23s08_ids,
248	.driver = {
249	.name = "mcp23s08",
250	.of_match_table = mcp23s08_spi_of_match,
251	},
252	};
253
254	static int __init mcp23s08_spi_init(void)
255	{
256	return spi_register_driver(&mcp23s08_driver);
257	}
258
259	/*
260	* Register after SPI postcore initcall and before
261	* subsys initcalls that may rely on these GPIOs.
262	*/
263	subsys_initcall(mcp23s08_spi_init);
264
265	static void mcp23s08_spi_exit(void)
266	{
267	spi_unregister_driver(&mcp23s08_driver);
268	}
269	module_exit(mcp23s08_spi_exit);
270
271	MODULE_LICENSE("GPL");