[linux-block.git] / drivers / mfd / stmpe-spi.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ST Microelectronics MFD: stmpe's spi client specific driver
 *
 * Copyright (C) ST Microelectronics SA 2011
 *
 * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics
 */

#include <linux/spi/spi.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/types.h>
#include "stmpe.h"

#define READ_CMD	(1 << 7)

static int spi_reg_read(struct stmpe *stmpe, u8 reg)
{
	struct spi_device *spi = stmpe->client;
	int status = spi_w8r16(spi, reg | READ_CMD);

	return (status < 0) ? status : status >> 8;
}

static int spi_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
{
	struct spi_device *spi = stmpe->client;
	u16 cmd = (val << 8) | reg;

	return spi_write(spi, (const u8 *)&cmd, 2);
}

static int spi_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
{
	int ret, i;

	for (i = 0; i < length; i++) {
		ret = spi_reg_read(stmpe, reg + i);
		if (ret < 0)
			return ret;
		*(values + i) = ret;
	}

	return 0;
}

static int spi_block_write(struct stmpe *stmpe, u8 reg, u8 length,
		const u8 *values)
{
	int ret = 0, i;

	for (i = length; i > 0; i--, reg++) {
		ret = spi_reg_write(stmpe, reg, *(values + i - 1));
		if (ret < 0)
			return ret;
	}

	return ret;
}

static void spi_init(struct stmpe *stmpe)
{
	struct spi_device *spi = stmpe->client;

	spi->bits_per_word = 8;

	/* This register is only present for stmpe811 */
	if (stmpe->variant->id_val == 0x0811)
		spi_reg_write(stmpe, STMPE811_REG_SPI_CFG, spi->mode);

	if (spi_setup(spi) < 0)
		dev_dbg(&spi->dev, "spi_setup failed\n");
}

static struct stmpe_client_info spi_ci = {
	.read_byte = spi_reg_read,
	.write_byte = spi_reg_write,
	.read_block = spi_block_read,
	.write_block = spi_block_write,
	.init = spi_init,
};

static int
stmpe_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);

	/* don't exceed max specified rate - 1MHz - Limitation of STMPE */
	if (spi->max_speed_hz > 1000000) {
		dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
				(spi->max_speed_hz/1000));
		return -EINVAL;
	}

	spi_ci.irq = spi->irq;
	spi_ci.client = spi;
	spi_ci.dev = &spi->dev;

	return stmpe_probe(&spi_ci, id->driver_data);
}

static int stmpe_spi_remove(struct spi_device *spi)
{
	struct stmpe *stmpe = spi_get_drvdata(spi);

	stmpe_remove(stmpe);

	return 0;
}

static const struct of_device_id stmpe_spi_of_match[] = {
	{ .compatible = "st,stmpe610", },
	{ .compatible = "st,stmpe801", },
	{ .compatible = "st,stmpe811", },
	{ .compatible = "st,stmpe1601", },
	{ .compatible = "st,stmpe2401", },
	{ .compatible = "st,stmpe2403", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, stmpe_spi_of_match);

static const struct spi_device_id stmpe_spi_id[] = {
	{ "stmpe610", STMPE610 },
	{ "stmpe801", STMPE801 },
	{ "stmpe811", STMPE811 },
	{ "stmpe1601", STMPE1601 },
	{ "stmpe2401", STMPE2401 },
	{ "stmpe2403", STMPE2403 },
	{ }
};
MODULE_DEVICE_TABLE(spi, stmpe_id);

static struct spi_driver stmpe_spi_driver = {
	.driver = {
		.name	= "stmpe-spi",
		.of_match_table = of_match_ptr(stmpe_spi_of_match),
#ifdef CONFIG_PM
		.pm	= &stmpe_dev_pm_ops,
#endif
	},
	.probe		= stmpe_spi_probe,
	.remove		= stmpe_spi_remove,
	.id_table	= stmpe_spi_id,
};

static int __init stmpe_init(void)
{
	return spi_register_driver(&stmpe_spi_driver);
}
subsys_initcall(stmpe_init);

static void __exit stmpe_exit(void)
{
	spi_unregister_driver(&stmpe_spi_driver);
}
module_exit(stmpe_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STMPE MFD SPI Interface Driver");
MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
Commit	Line	Data
1f67b599	1	// SPDX-License-Identifier: GPL-2.0-only
e789995d VK	2	/*
	3	* ST Microelectronics MFD: stmpe's spi client specific driver
	4	*
	5	* Copyright (C) ST Microelectronics SA 2011
	6	*
da89947b	7	* Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics
e789995d VK	8	*/
	9
	10	#include <linux/spi/spi.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
1e955bec	14	#include <linux/of.h>
e789995d VK	15	#include <linux/types.h>
	16	#include "stmpe.h"
	17
	18	#define READ_CMD (1 << 7)
	19
	20	static int spi_reg_read(struct stmpe *stmpe, u8 reg)
	21	{
	22	struct spi_device *spi = stmpe->client;
	23	int status = spi_w8r16(spi, reg \| READ_CMD);
	24
	25	return (status < 0) ? status : status >> 8;
	26	}
	27
	28	static int spi_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
	29	{
	30	struct spi_device *spi = stmpe->client;
	31	u16 cmd = (val << 8) \| reg;
	32
	33	return spi_write(spi, (const u8 *)&cmd, 2);
	34	}
	35
	36	static int spi_block_read(struct stmpe stmpe, u8 reg, u8 length, u8 values)
	37	{
	38	int ret, i;
	39
	40	for (i = 0; i < length; i++) {
	41	ret = spi_reg_read(stmpe, reg + i);
	42	if (ret < 0)
	43	return ret;
	44	*(values + i) = ret;
	45	}
	46
	47	return 0;
	48	}
	49
	50	static int spi_block_write(struct stmpe *stmpe, u8 reg, u8 length,
	51	const u8 *values)
	52	{
	53	int ret = 0, i;
	54
	55	for (i = length; i > 0; i--, reg++) {
	56	ret = spi_reg_write(stmpe, reg, *(values + i - 1));
	57	if (ret < 0)
	58	return ret;
	59	}
	60
	61	return ret;
	62	}
	63
	64	static void spi_init(struct stmpe *stmpe)
	65	{
	66	struct spi_device *spi = stmpe->client;
	67
	68	spi->bits_per_word = 8;
	69
	70	/* This register is only present for stmpe811 */
	71	if (stmpe->variant->id_val == 0x0811)
	72	spi_reg_write(stmpe, STMPE811_REG_SPI_CFG, spi->mode);
	73
	74	if (spi_setup(spi) < 0)
	75	dev_dbg(&spi->dev, "spi_setup failed\n");
	76	}
	77
	78	static struct stmpe_client_info spi_ci = {
79	.read_byte = spi_reg_read,
80	.write_byte = spi_reg_write,
81	.read_block = spi_block_read,
82	.write_block = spi_block_write,
83	.init = spi_init,
84	};
85
f791be49	86	static int
e789995d VK	87	stmpe_spi_probe(struct spi_device *spi)
	88	{
	89	const struct spi_device_id *id = spi_get_device_id(spi);
	90
	91	/* don't exceed max specified rate - 1MHz - Limitation of STMPE */
	92	if (spi->max_speed_hz > 1000000) {
	93	dev_dbg(&spi->dev, "f(sample) %d KHz?\n",
	94	(spi->max_speed_hz/1000));
	95	return -EINVAL;
	96	}
	97
	98	spi_ci.irq = spi->irq;
	99	spi_ci.client = spi;
	100	spi_ci.dev = &spi->dev;
	101
	102	return stmpe_probe(&spi_ci, id->driver_data);
	103	}
	104
4740f73f	105	static int stmpe_spi_remove(struct spi_device *spi)
e789995d	106	{
e65ad41e	107	struct stmpe *stmpe = spi_get_drvdata(spi);
e789995d	108
356bbaba UKK	109	stmpe_remove(stmpe);
	110
	111	return 0;
e789995d VK	112	}
e789995d VK	113
1e955bec JMC	114	static const struct of_device_id stmpe_spi_of_match[] = {
	115	{ .compatible = "st,stmpe610", },
	116	{ .compatible = "st,stmpe801", },
	117	{ .compatible = "st,stmpe811", },
	118	{ .compatible = "st,stmpe1601", },
	119	{ .compatible = "st,stmpe2401", },
	120	{ .compatible = "st,stmpe2403", },
	121	{ /* sentinel */ },
	122	};
	123	MODULE_DEVICE_TABLE(of, stmpe_spi_of_match);
	124
e789995d	125	static const struct spi_device_id stmpe_spi_id[] = {
1cda2394	126	{ "stmpe610", STMPE610 },
7f7f4ea1	127	{ "stmpe801", STMPE801 },
e789995d VK	128	{ "stmpe811", STMPE811 },
	129	{ "stmpe1601", STMPE1601 },
	130	{ "stmpe2401", STMPE2401 },
	131	{ "stmpe2403", STMPE2403 },
	132	{ }
	133	};
	134	MODULE_DEVICE_TABLE(spi, stmpe_id);
	135
	136	static struct spi_driver stmpe_spi_driver = {
	137	.driver = {
	138	.name = "stmpe-spi",
1e955bec	139	.of_match_table = of_match_ptr(stmpe_spi_of_match),
e789995d VK	140	#ifdef CONFIG_PM
	141	.pm = &stmpe_dev_pm_ops,
	142	#endif
	143	},
	144	.probe = stmpe_spi_probe,
84449216	145	.remove = stmpe_spi_remove,
e789995d VK	146	.id_table = stmpe_spi_id,
	147	};
	148
	149	static int __init stmpe_init(void)
	150	{
	151	return spi_register_driver(&stmpe_spi_driver);
	152	}
	153	subsys_initcall(stmpe_init);
	154
	155	static void __exit stmpe_exit(void)
	156	{
	157	spi_unregister_driver(&stmpe_spi_driver);
	158	}
	159	module_exit(stmpe_exit);
	160
	161	MODULE_LICENSE("GPL v2");
	162	MODULE_DESCRIPTION("STMPE MFD SPI Interface Driver");
da89947b	163	MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");