[deliverable/linux.git] / drivers / net / phy / spi_ks8995.c

/*
 * SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
 *
 * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
 *
 * This file was based on: drivers/spi/at25.c
 *     Copyright (C) 2006 David Brownell
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>

#include <linux/spi/spi.h>

#define DRV_VERSION		"0.1.1"
#define DRV_DESC		"Micrel KS8995 Ethernet switch SPI driver"

/* ------------------------------------------------------------------------ */

#define KS8995_REG_ID0		0x00    /* Chip ID0 */
#define KS8995_REG_ID1		0x01    /* Chip ID1 */

#define KS8995_REG_GC0		0x02    /* Global Control 0 */
#define KS8995_REG_GC1		0x03    /* Global Control 1 */
#define KS8995_REG_GC2		0x04    /* Global Control 2 */
#define KS8995_REG_GC3		0x05    /* Global Control 3 */
#define KS8995_REG_GC4		0x06    /* Global Control 4 */
#define KS8995_REG_GC5		0x07    /* Global Control 5 */
#define KS8995_REG_GC6		0x08    /* Global Control 6 */
#define KS8995_REG_GC7		0x09    /* Global Control 7 */
#define KS8995_REG_GC8		0x0a    /* Global Control 8 */
#define KS8995_REG_GC9		0x0b    /* Global Control 9 */

#define KS8995_REG_PC(p, r)	((0x10 * p) + r)	 /* Port Control */
#define KS8995_REG_PS(p, r)	((0x10 * p) + r + 0xe)  /* Port Status */

#define KS8995_REG_TPC0		0x60    /* TOS Priority Control 0 */
#define KS8995_REG_TPC1		0x61    /* TOS Priority Control 1 */
#define KS8995_REG_TPC2		0x62    /* TOS Priority Control 2 */
#define KS8995_REG_TPC3		0x63    /* TOS Priority Control 3 */
#define KS8995_REG_TPC4		0x64    /* TOS Priority Control 4 */
#define KS8995_REG_TPC5		0x65    /* TOS Priority Control 5 */
#define KS8995_REG_TPC6		0x66    /* TOS Priority Control 6 */
#define KS8995_REG_TPC7		0x67    /* TOS Priority Control 7 */

#define KS8995_REG_MAC0		0x68    /* MAC address 0 */
#define KS8995_REG_MAC1		0x69    /* MAC address 1 */
#define KS8995_REG_MAC2		0x6a    /* MAC address 2 */
#define KS8995_REG_MAC3		0x6b    /* MAC address 3 */
#define KS8995_REG_MAC4		0x6c    /* MAC address 4 */
#define KS8995_REG_MAC5		0x6d    /* MAC address 5 */

#define KS8995_REG_IAC0		0x6e    /* Indirect Access Control 0 */
#define KS8995_REG_IAC1		0x6f    /* Indirect Access Control 0 */
#define KS8995_REG_IAD7		0x70    /* Indirect Access Data 7 */
#define KS8995_REG_IAD6		0x71    /* Indirect Access Data 6 */
#define KS8995_REG_IAD5		0x72    /* Indirect Access Data 5 */
#define KS8995_REG_IAD4		0x73    /* Indirect Access Data 4 */
#define KS8995_REG_IAD3		0x74    /* Indirect Access Data 3 */
#define KS8995_REG_IAD2		0x75    /* Indirect Access Data 2 */
#define KS8995_REG_IAD1		0x76    /* Indirect Access Data 1 */
#define KS8995_REG_IAD0		0x77    /* Indirect Access Data 0 */

#define KSZ8864_REG_ID1		0xfe	/* Chip ID in bit 7 */

#define KS8995_REGS_SIZE	0x80
#define KSZ8864_REGS_SIZE	0x100

#define ID1_CHIPID_M		0xf
#define ID1_CHIPID_S		4
#define ID1_REVISION_M		0x7
#define ID1_REVISION_S		1
#define ID1_START_SW		1	/* start the switch */

#define FAMILY_KS8995		0x95
#define CHIPID_M		0
#define KS8995_CHIP_ID		0x00
#define KSZ8864_CHIP_ID		0x01

#define KS8995_CMD_WRITE	0x02U
#define KS8995_CMD_READ		0x03U

#define KS8995_RESET_DELAY	10 /* usec */

enum ks8995_chip_variant {
	ks8995,
	ksz8864,
	max_variant
};

struct ks8995_chip_params {
	char *name;
	int family_id;
	int chip_id;
	int regs_size;
};

static const struct ks8995_chip_params ks8995_chip[] = {
	[ks8995] = {
		.name = "KS8995MA",
		.family_id = FAMILY_KS8995,
		.chip_id = KS8995_CHIP_ID,
		.regs_size = KS8995_REGS_SIZE,
	},
	[ksz8864] = {
		.name = "KSZ8864RMN",
		.family_id = FAMILY_KS8995,
		.chip_id = KSZ8864_CHIP_ID,
		.regs_size = KSZ8864_REGS_SIZE,
	},
};

struct ks8995_pdata {
	/* not yet implemented */
};

struct ks8995_switch {
	struct spi_device	*spi;
	struct mutex		lock;
	struct ks8995_pdata	*pdata;
	struct bin_attribute	regs_attr;
	const struct ks8995_chip_params	*chip;
	int			revision_id;
};

static const struct spi_device_id ks8995_id[] = {
	{"ks8995", ks8995},
	{"ksz8864", ksz8864},
	{ }
};
MODULE_DEVICE_TABLE(spi, ks8995_id);

static inline u8 get_chip_id(u8 val)
{
	return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
}

static inline u8 get_chip_rev(u8 val)
{
	return (val >> ID1_REVISION_S) & ID1_REVISION_M;
}

/* ------------------------------------------------------------------------ */
static int ks8995_read(struct ks8995_switch *ks, char *buf,
		 unsigned offset, size_t count)
{
	u8 cmd[2];
	struct spi_transfer t[2];
	struct spi_message m;
	int err;

	spi_message_init(&m);

	memset(&t, 0, sizeof(t));

	t[0].tx_buf = cmd;
	t[0].len = sizeof(cmd);
	spi_message_add_tail(&t[0], &m);

	t[1].rx_buf = buf;
	t[1].len = count;
	spi_message_add_tail(&t[1], &m);

	cmd[0] = KS8995_CMD_READ;
	cmd[1] = offset;

	mutex_lock(&ks->lock);
	err = spi_sync(ks->spi, &m);
	mutex_unlock(&ks->lock);

	return err ? err : count;
}


static int ks8995_write(struct ks8995_switch *ks, char *buf,
		 unsigned offset, size_t count)
{
	u8 cmd[2];
	struct spi_transfer t[2];
	struct spi_message m;
	int err;

	spi_message_init(&m);

	memset(&t, 0, sizeof(t));

	t[0].tx_buf = cmd;
	t[0].len = sizeof(cmd);
	spi_message_add_tail(&t[0], &m);

	t[1].tx_buf = buf;
	t[1].len = count;
	spi_message_add_tail(&t[1], &m);

	cmd[0] = KS8995_CMD_WRITE;
	cmd[1] = offset;

	mutex_lock(&ks->lock);
	err = spi_sync(ks->spi, &m);
	mutex_unlock(&ks->lock);

	return err ? err : count;
}

static inline int ks8995_read_reg(struct ks8995_switch *ks, u8 addr, u8 *buf)
{
	return ks8995_read(ks, buf, addr, 1) != 1;
}

static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
{
	char buf = val;

	return ks8995_write(ks, &buf, addr, 1) != 1;
}

/* ------------------------------------------------------------------------ */

static int ks8995_stop(struct ks8995_switch *ks)
{
	return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
}

static int ks8995_start(struct ks8995_switch *ks)
{
	return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
}

static int ks8995_reset(struct ks8995_switch *ks)
{
	int err;

	err = ks8995_stop(ks);
	if (err)
		return err;

	udelay(KS8995_RESET_DELAY);

	return ks8995_start(ks);
}

static ssize_t ks8995_registers_read(struct file *filp, struct kobject *kobj,
	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
{
	struct device *dev;
	struct ks8995_switch *ks8995;

	dev = container_of(kobj, struct device, kobj);
	ks8995 = dev_get_drvdata(dev);

	return ks8995_read(ks8995, buf, off, count);
}

static ssize_t ks8995_registers_write(struct file *filp, struct kobject *kobj,
	struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count)
{
	struct device *dev;
	struct ks8995_switch *ks8995;

	dev = container_of(kobj, struct device, kobj);
	ks8995 = dev_get_drvdata(dev);

	return ks8995_write(ks8995, buf, off, count);
}

/* ks8995_get_revision - get chip revision
 * @ks: pointer to switch instance
 *
 * Verify chip family and id and get chip revision.
 */
static int ks8995_get_revision(struct ks8995_switch *ks)
{
	int err;
	u8 id0, id1, ksz8864_id;

	/* read family id */
	err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
	if (err) {
		err = -EIO;
		goto err_out;
	}

	/* verify family id */
	if (id0 != ks->chip->family_id) {
		dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
			ks->chip->family_id, id0);
		err = -ENODEV;
		goto err_out;
	}

	switch (ks->chip->family_id) {
	case FAMILY_KS8995:
		/* try reading chip id at CHIP ID1 */
		err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
		if (err) {
			err = -EIO;
			goto err_out;
		}

		/* verify chip id */
		if ((get_chip_id(id1) == CHIPID_M) &&
		    (get_chip_id(id1) == ks->chip->chip_id)) {
			/* KS8995MA */
			ks->revision_id = get_chip_rev(id1);
		} else if (get_chip_id(id1) != CHIPID_M) {
			/* KSZ8864RMN */
			err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
			if (err) {
				err = -EIO;
				goto err_out;
			}

			if ((ksz8864_id & 0x80) &&
			    (ks->chip->chip_id == KSZ8864_CHIP_ID)) {
				ks->revision_id = get_chip_rev(id1);
			}

		} else {
			dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
				id1);
			err = -ENODEV;
		}
		break;
	default:
		dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
		err = -ENODEV;
		break;
	}
err_out:
	return err;
}

static const struct bin_attribute ks8995_registers_attr = {
	.attr = {
		.name   = "registers",
		.mode   = S_IRUSR | S_IWUSR,
	},
	.size   = KS8995_REGS_SIZE,
	.read   = ks8995_registers_read,
	.write  = ks8995_registers_write,
};

/* ------------------------------------------------------------------------ */
static int ks8995_probe(struct spi_device *spi)
{
	struct ks8995_switch    *ks;
	struct ks8995_pdata     *pdata;
	int     err;
	int variant = spi_get_device_id(spi)->driver_data;

	/* Chip description */
	pdata = spi->dev.platform_data;

	if (variant >= max_variant) {
		dev_err(&spi->dev, "bad chip variant %d\n", variant);
		return -ENODEV;
	}

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

	mutex_init(&ks->lock);
	ks->pdata = pdata;
	ks->spi = spi_dev_get(spi);
	ks->chip = &ks8995_chip[variant];

	spi_set_drvdata(spi, ks);

	spi->mode = SPI_MODE_0;
	spi->bits_per_word = 8;
	err = spi_setup(spi);
	if (err) {
		dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
		return err;
	}

	err = ks8995_get_revision(ks);
	if (err)
		return err;

	ks->regs_attr.size = ks->chip->regs_size;
	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));

	err = ks8995_reset(ks);
	if (err)
		return err;

	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
	if (err) {
		dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
				    err);
		return err;
	}

	dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
		 ks->chip->name, ks->chip->chip_id, ks->revision_id);

	return 0;
}

static int ks8995_remove(struct spi_device *spi)
{
	struct ks8995_switch *ks = spi_get_drvdata(spi);

	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);

	return 0;
}

/* ------------------------------------------------------------------------ */

static struct spi_driver ks8995_driver = {
	.driver = {
		.name	    = "spi-ks8995",
	},
	.probe	  = ks8995_probe,
	.remove	  = ks8995_remove,
	.id_table = ks8995_id,
};

module_spi_driver(ks8995_driver);

MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
a8e510f6	1	/*
240a12d5	2	* SPI driver for Micrel/Kendin KS8995M and KSZ8864RMN ethernet switches
a8e510f6 FL	3	*
	4	* Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
	5	*
	6	* This file was based on: drivers/spi/at25.c
	7	* Copyright (C) 2006 David Brownell
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License version 2 as published
	11	* by the Free Software Foundation.
	12	*/
	13
8d242488 JP	14	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8d242488 JP	15
a8e510f6 FL	16	#include <linux/types.h>
a8e510f6 FL	17	#include <linux/kernel.h>
a8e510f6 FL	18	#include <linux/module.h>
	19	#include <linux/delay.h>
	20	#include <linux/device.h>
	21
	22	#include <linux/spi/spi.h>
	23
	24	#define DRV_VERSION "0.1.1"
	25	#define DRV_DESC "Micrel KS8995 Ethernet switch SPI driver"
	26
	27	/* ------------------------------------------------------------------------ */
	28
	29	#define KS8995_REG_ID0 0x00 /* Chip ID0 */
	30	#define KS8995_REG_ID1 0x01 /* Chip ID1 */
	31
	32	#define KS8995_REG_GC0 0x02 /* Global Control 0 */
	33	#define KS8995_REG_GC1 0x03 /* Global Control 1 */
	34	#define KS8995_REG_GC2 0x04 /* Global Control 2 */
	35	#define KS8995_REG_GC3 0x05 /* Global Control 3 */
	36	#define KS8995_REG_GC4 0x06 /* Global Control 4 */
	37	#define KS8995_REG_GC5 0x07 /* Global Control 5 */
	38	#define KS8995_REG_GC6 0x08 /* Global Control 6 */
	39	#define KS8995_REG_GC7 0x09 /* Global Control 7 */
	40	#define KS8995_REG_GC8 0x0a /* Global Control 8 */
	41	#define KS8995_REG_GC9 0x0b /* Global Control 9 */
	42
	43	#define KS8995_REG_PC(p, r) ((0x10 * p) + r) /* Port Control */
	44	#define KS8995_REG_PS(p, r) ((0x10 * p) + r + 0xe) /* Port Status */
	45
	46	#define KS8995_REG_TPC0 0x60 /* TOS Priority Control 0 */
	47	#define KS8995_REG_TPC1 0x61 /* TOS Priority Control 1 */
	48	#define KS8995_REG_TPC2 0x62 /* TOS Priority Control 2 */
	49	#define KS8995_REG_TPC3 0x63 /* TOS Priority Control 3 */
	50	#define KS8995_REG_TPC4 0x64 /* TOS Priority Control 4 */
	51	#define KS8995_REG_TPC5 0x65 /* TOS Priority Control 5 */
	52	#define KS8995_REG_TPC6 0x66 /* TOS Priority Control 6 */
	53	#define KS8995_REG_TPC7 0x67 /* TOS Priority Control 7 */
	54
	55	#define KS8995_REG_MAC0 0x68 /* MAC address 0 */
	56	#define KS8995_REG_MAC1 0x69 /* MAC address 1 */
	57	#define KS8995_REG_MAC2 0x6a /* MAC address 2 */
	58	#define KS8995_REG_MAC3 0x6b /* MAC address 3 */
	59	#define KS8995_REG_MAC4 0x6c /* MAC address 4 */
	60	#define KS8995_REG_MAC5 0x6d /* MAC address 5 */
	61
	62	#define KS8995_REG_IAC0 0x6e /* Indirect Access Control 0 */
	63	#define KS8995_REG_IAC1 0x6f /* Indirect Access Control 0 */
	64	#define KS8995_REG_IAD7 0x70 /* Indirect Access Data 7 */
	65	#define KS8995_REG_IAD6 0x71 /* Indirect Access Data 6 */
	66	#define KS8995_REG_IAD5 0x72 /* Indirect Access Data 5 */
	67	#define KS8995_REG_IAD4 0x73 /* Indirect Access Data 4 */
	68	#define KS8995_REG_IAD3 0x74 /* Indirect Access Data 3 */
	69	#define KS8995_REG_IAD2 0x75 /* Indirect Access Data 2 */
	70	#define KS8995_REG_IAD1 0x76 /* Indirect Access Data 1 */
	71	#define KS8995_REG_IAD0 0x77 /* Indirect Access Data 0 */
	72
240a12d5 PZ	73	#define KSZ8864_REG_ID1 0xfe /* Chip ID in bit 7 */
240a12d5 PZ	74
a8e510f6	75	#define KS8995_REGS_SIZE 0x80
240a12d5	76	#define KSZ8864_REGS_SIZE 0x100
a8e510f6 FL	77
	78	#define ID1_CHIPID_M 0xf
	79	#define ID1_CHIPID_S 4
	80	#define ID1_REVISION_M 0x7
	81	#define ID1_REVISION_S 1
	82	#define ID1_START_SW 1 /* start the switch */
	83
	84	#define FAMILY_KS8995 0x95
	85	#define CHIPID_M 0
484e36ff HB	86	#define KS8995_CHIP_ID 0x00
484e36ff HB	87	#define KSZ8864_CHIP_ID 0x01
a8e510f6 FL	88
	89	#define KS8995_CMD_WRITE 0x02U
	90	#define KS8995_CMD_READ 0x03U
	91
	92	#define KS8995_RESET_DELAY 10 /* usec */
	93
aa54c8da HB	94	enum ks8995_chip_variant {
	95	ks8995,
	96	ksz8864,
	97	max_variant
	98	};
	99
	100	struct ks8995_chip_params {
	101	char *name;
484e36ff HB	102	int family_id;
484e36ff HB	103	int chip_id;
aa54c8da HB	104	int regs_size;
	105	};
	106
	107	static const struct ks8995_chip_params ks8995_chip[] = {
	108	[ks8995] = {
	109	.name = "KS8995MA",
484e36ff HB	110	.family_id = FAMILY_KS8995,
484e36ff HB	111	.chip_id = KS8995_CHIP_ID,
aa54c8da HB	112	.regs_size = KS8995_REGS_SIZE,
	113	},
	114	[ksz8864] = {
	115	.name = "KSZ8864RMN",
484e36ff HB	116	.family_id = FAMILY_KS8995,
484e36ff HB	117	.chip_id = KSZ8864_CHIP_ID,
aa54c8da HB	118	.regs_size = KSZ8864_REGS_SIZE,
	119	},
	120	};
	121
a8e510f6 FL	122	struct ks8995_pdata {
	123	/* not yet implemented */
	124	};
	125
	126	struct ks8995_switch {
	127	struct spi_device *spi;
	128	struct mutex lock;
	129	struct ks8995_pdata *pdata;
240a12d5	130	struct bin_attribute regs_attr;
aa54c8da	131	const struct ks8995_chip_params *chip;
484e36ff	132	int revision_id;
a8e510f6 FL	133	};
a8e510f6 FL	134
aa54c8da HB	135	static const struct spi_device_id ks8995_id[] = {
	136	{"ks8995", ks8995},
	137	{"ksz8864", ksz8864},
	138	{ }
	139	};
	140	MODULE_DEVICE_TABLE(spi, ks8995_id);
	141
a8e510f6 FL	142	static inline u8 get_chip_id(u8 val)
	143	{
	144	return (val >> ID1_CHIPID_S) & ID1_CHIPID_M;
	145	}
	146
	147	static inline u8 get_chip_rev(u8 val)
	148	{
	149	return (val >> ID1_REVISION_S) & ID1_REVISION_M;
	150	}
	151
	152	/* ------------------------------------------------------------------------ */
	153	static int ks8995_read(struct ks8995_switch ks, char buf,
	154	unsigned offset, size_t count)
	155	{
	156	u8 cmd[2];
	157	struct spi_transfer t[2];
	158	struct spi_message m;
	159	int err;
	160
	161	spi_message_init(&m);
	162
	163	memset(&t, 0, sizeof(t));
	164
	165	t[0].tx_buf = cmd;
	166	t[0].len = sizeof(cmd);
	167	spi_message_add_tail(&t[0], &m);
	168
	169	t[1].rx_buf = buf;
	170	t[1].len = count;
	171	spi_message_add_tail(&t[1], &m);
	172
	173	cmd[0] = KS8995_CMD_READ;
	174	cmd[1] = offset;
	175
	176	mutex_lock(&ks->lock);
	177	err = spi_sync(ks->spi, &m);
	178	mutex_unlock(&ks->lock);
	179
	180	return err ? err : count;
	181	}
	182
	183
	184	static int ks8995_write(struct ks8995_switch ks, char buf,
	185	unsigned offset, size_t count)
	186	{
	187	u8 cmd[2];
	188	struct spi_transfer t[2];
	189	struct spi_message m;
	190	int err;
	191
	192	spi_message_init(&m);
	193
	194	memset(&t, 0, sizeof(t));
	195
	196	t[0].tx_buf = cmd;
	197	t[0].len = sizeof(cmd);
	198	spi_message_add_tail(&t[0], &m);
	199
	200	t[1].tx_buf = buf;
	201	t[1].len = count;
	202	spi_message_add_tail(&t[1], &m);
	203
	204	cmd[0] = KS8995_CMD_WRITE;
	205	cmd[1] = offset;
206
207	mutex_lock(&ks->lock);
208	err = spi_sync(ks->spi, &m);
209	mutex_unlock(&ks->lock);
210
211	return err ? err : count;
212	}
213
214	static inline int ks8995_read_reg(struct ks8995_switch ks, u8 addr, u8 buf)
215	{
7aff9675	216	return ks8995_read(ks, buf, addr, 1) != 1;
a8e510f6 FL	217	}
	218
	219	static inline int ks8995_write_reg(struct ks8995_switch *ks, u8 addr, u8 val)
	220	{
	221	char buf = val;
	222
7aff9675	223	return ks8995_write(ks, &buf, addr, 1) != 1;
a8e510f6 FL	224	}
	225
	226	/* ------------------------------------------------------------------------ */
	227
	228	static int ks8995_stop(struct ks8995_switch *ks)
	229	{
	230	return ks8995_write_reg(ks, KS8995_REG_ID1, 0);
	231	}
	232
	233	static int ks8995_start(struct ks8995_switch *ks)
	234	{
	235	return ks8995_write_reg(ks, KS8995_REG_ID1, 1);
	236	}
	237
	238	static int ks8995_reset(struct ks8995_switch *ks)
	239	{
	240	int err;
	241
	242	err = ks8995_stop(ks);
	243	if (err)
	244	return err;
	245
	246	udelay(KS8995_RESET_DELAY);
	247
	248	return ks8995_start(ks);
	249	}
	250
a8e510f6 FL	251	static ssize_t ks8995_registers_read(struct file filp, struct kobject kobj,
	252	struct bin_attribute bin_attr, char buf, loff_t off, size_t count)
	253	{
	254	struct device *dev;
	255	struct ks8995_switch *ks8995;
	256
	257	dev = container_of(kobj, struct device, kobj);
	258	ks8995 = dev_get_drvdata(dev);
	259
a8e510f6 FL	260	return ks8995_read(ks8995, buf, off, count);
	261	}
	262
a8e510f6 FL	263	static ssize_t ks8995_registers_write(struct file filp, struct kobject kobj,
	264	struct bin_attribute bin_attr, char buf, loff_t off, size_t count)
	265	{
	266	struct device *dev;
	267	struct ks8995_switch *ks8995;
	268
	269	dev = container_of(kobj, struct device, kobj);
	270	ks8995 = dev_get_drvdata(dev);
	271
a8e510f6 FL	272	return ks8995_write(ks8995, buf, off, count);
	273	}
	274
484e36ff HB	275	/* ks8995_get_revision - get chip revision
	276	* @ks: pointer to switch instance
	277	*
	278	* Verify chip family and id and get chip revision.
	279	*/
	280	static int ks8995_get_revision(struct ks8995_switch *ks)
	281	{
	282	int err;
	283	u8 id0, id1, ksz8864_id;
	284
	285	/* read family id */
	286	err = ks8995_read_reg(ks, KS8995_REG_ID0, &id0);
	287	if (err) {
	288	err = -EIO;
	289	goto err_out;
	290	}
	291
	292	/* verify family id */
	293	if (id0 != ks->chip->family_id) {
	294	dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",
	295	ks->chip->family_id, id0);
	296	err = -ENODEV;
	297	goto err_out;
	298	}
	299
	300	switch (ks->chip->family_id) {
	301	case FAMILY_KS8995:
	302	/* try reading chip id at CHIP ID1 */
	303	err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);
	304	if (err) {
	305	err = -EIO;
	306	goto err_out;
	307	}
	308
	309	/* verify chip id */
	310	if ((get_chip_id(id1) == CHIPID_M) &&
	311	(get_chip_id(id1) == ks->chip->chip_id)) {
	312	/* KS8995MA */
	313	ks->revision_id = get_chip_rev(id1);
	314	} else if (get_chip_id(id1) != CHIPID_M) {
	315	/* KSZ8864RMN */
	316	err = ks8995_read_reg(ks, KS8995_REG_ID1, &ksz8864_id);
	317	if (err) {
	318	err = -EIO;
	319	goto err_out;
	320	}
	321
	322	if ((ksz8864_id & 0x80) &&
	323	(ks->chip->chip_id == KSZ8864_CHIP_ID)) {
	324	ks->revision_id = get_chip_rev(id1);
	325	}
	326
	327	} else {
	328	dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",
	329	id1);
	330	err = -ENODEV;
	331	}
	332	break;
	333	default:
	334	dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);
	335	err = -ENODEV;
	336	break;
	337	}
	338	err_out:
339	return err;
340	}
341
240a12d5	342	static const struct bin_attribute ks8995_registers_attr = {
a8e510f6 FL	343	.attr = {
	344	.name = "registers",
	345	.mode = S_IRUSR \| S_IWUSR,
	346	},
	347	.size = KS8995_REGS_SIZE,
	348	.read = ks8995_registers_read,
	349	.write = ks8995_registers_write,
	350	};
	351
	352	/* ------------------------------------------------------------------------ */
633d1594	353	static int ks8995_probe(struct spi_device *spi)
a8e510f6 FL	354	{
	355	struct ks8995_switch *ks;
	356	struct ks8995_pdata *pdata;
a8e510f6	357	int err;
aa54c8da	358	int variant = spi_get_device_id(spi)->driver_data;
a8e510f6 FL	359
	360	/* Chip description */
	361	pdata = spi->dev.platform_data;
	362
aa54c8da HB	363	if (variant >= max_variant) {
	364	dev_err(&spi->dev, "bad chip variant %d\n", variant);
	365	return -ENODEV;
	366	}
	367
b32a8b64	368	ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);
e68ed8f0	369	if (!ks)
a8e510f6	370	return -ENOMEM;
a8e510f6 FL	371
	372	mutex_init(&ks->lock);
	373	ks->pdata = pdata;
	374	ks->spi = spi_dev_get(spi);
aa54c8da HB	375	ks->chip = &ks8995_chip[variant];
aa54c8da HB	376
5d5f1846	377	spi_set_drvdata(spi, ks);
a8e510f6 FL	378
	379	spi->mode = SPI_MODE_0;
	380	spi->bits_per_word = 8;
	381	err = spi_setup(spi);
	382	if (err) {
	383	dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);
b32a8b64	384	return err;
a8e510f6 FL	385	}
a8e510f6 FL	386
484e36ff HB	387	err = ks8995_get_revision(ks);
484e36ff HB	388	if (err)
b32a8b64	389	return err;
a8e510f6	390
aa54c8da	391	ks->regs_attr.size = ks->chip->regs_size;
240a12d5	392	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));
240a12d5	393
a8e510f6 FL	394	err = ks8995_reset(ks);
a8e510f6 FL	395	if (err)
b32a8b64	396	return err;
a8e510f6	397
240a12d5	398	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);
a8e510f6 FL	399	if (err) {
	400	dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",
	401	err);
b32a8b64	402	return err;
a8e510f6 FL	403	}
a8e510f6 FL	404
484e36ff HB	405	dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",
484e36ff HB	406	ks->chip->name, ks->chip->chip_id, ks->revision_id);
a8e510f6 FL	407
a8e510f6 FL	408	return 0;
a8e510f6 FL	409	}
a8e510f6 FL	410
633d1594	411	static int ks8995_remove(struct spi_device *spi)
a8e510f6	412	{
30349bdb VZ	413	struct ks8995_switch *ks = spi_get_drvdata(spi);
	414
	415	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
a8e510f6	416
a8e510f6 FL	417	return 0;
	418	}
	419
	420	/* ------------------------------------------------------------------------ */
	421
	422	static struct spi_driver ks8995_driver = {
	423	.driver = {
	424	.name = "spi-ks8995",
a8e510f6 FL	425	},
a8e510f6 FL	426	.probe = ks8995_probe,
633d1594	427	.remove = ks8995_remove,
aa54c8da	428	.id_table = ks8995_id,
a8e510f6 FL	429	};
a8e510f6 FL	430
1a9561a3	431	module_spi_driver(ks8995_driver);
a8e510f6 FL	432
	433	MODULE_DESCRIPTION(DRV_DESC);
	434	MODULE_VERSION(DRV_VERSION);
	435	MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
	436	MODULE_LICENSE("GPL v2");