[thirdparty/kernel/stable.git] / drivers / media / pci / ngene / ngene-i2c.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
 *
 * Copyright (C) 2005-2007 Micronas
 *
 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
 *                         Modifications for new nGene firmware,
 *                         support for EEPROM-copying,
 *                         support for new dual DVB-S2 card prototype
 */

/* FIXME - some of these can probably be removed */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <asm/div64.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/timer.h>
#include <linux/byteorder/generic.h>
#include <linux/firmware.h>
#include <linux/vmalloc.h>

#include "ngene.h"

/* Firmware command for i2c operations */
static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
			   u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
{
	struct ngene_command com;

	com.cmd.hdr.Opcode = CMD_I2C_READ;
	com.cmd.hdr.Length = outlen + 3;
	com.cmd.I2CRead.Device = adr << 1;
	memcpy(com.cmd.I2CRead.Data, out, outlen);
	com.cmd.I2CRead.Data[outlen] = inlen;
	com.cmd.I2CRead.Data[outlen + 1] = 0;
	com.in_len = outlen + 3;
	com.out_len = inlen + 1;

	if (ngene_command(dev, &com) < 0)
		return -EIO;

	if ((com.cmd.raw8[0] >> 1) != adr)
		return -EIO;

	if (flag)
		memcpy(in, com.cmd.raw8, inlen + 1);
	else
		memcpy(in, com.cmd.raw8 + 1, inlen);
	return 0;
}

static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
				   u8 *out, u8 outlen)
{
	struct ngene_command com;


	com.cmd.hdr.Opcode = CMD_I2C_WRITE;
	com.cmd.hdr.Length = outlen + 1;
	com.cmd.I2CRead.Device = adr << 1;
	memcpy(com.cmd.I2CRead.Data, out, outlen);
	com.in_len = outlen + 1;
	com.out_len = 1;

	if (ngene_command(dev, &com) < 0)
		return -EIO;

	if (com.cmd.raw8[0] == 1)
		return -EIO;

	return 0;
}

static void ngene_i2c_set_bus(struct ngene *dev, int bus)
{
	if (!(dev->card_info->i2c_access & 2))
		return;
	if (dev->i2c_current_bus == bus)
		return;

	switch (bus) {
	case 0:
		ngene_command_gpio_set(dev, 3, 0);
		ngene_command_gpio_set(dev, 2, 1);
		break;

	case 1:
		ngene_command_gpio_set(dev, 2, 0);
		ngene_command_gpio_set(dev, 3, 1);
		break;
	}
	dev->i2c_current_bus = bus;
}

static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
				 struct i2c_msg msg[], int num)
{
	struct ngene_channel *chan =
		(struct ngene_channel *)i2c_get_adapdata(adapter);
	struct ngene *dev = chan->dev;

	mutex_lock(&dev->i2c_switch_mutex);
	ngene_i2c_set_bus(dev, chan->number);

	if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
		if (!ngene_command_i2c_read(dev, msg[0].addr,
					    msg[0].buf, msg[0].len,
					    msg[1].buf, msg[1].len, 0))
			goto done;

	if (num == 1 && !(msg[0].flags & I2C_M_RD))
		if (!ngene_command_i2c_write(dev, msg[0].addr,
					     msg[0].buf, msg[0].len))
			goto done;
	if (num == 1 && (msg[0].flags & I2C_M_RD))
		if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
					    msg[0].buf, msg[0].len, 0))
			goto done;

	mutex_unlock(&dev->i2c_switch_mutex);
	return -EIO;

done:
	mutex_unlock(&dev->i2c_switch_mutex);
	return num;
}


static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}

static const struct i2c_algorithm ngene_i2c_algo = {
	.master_xfer = ngene_i2c_master_xfer,
	.functionality = ngene_i2c_functionality,
};

int ngene_i2c_init(struct ngene *dev, int dev_nr)
{
	struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);

	i2c_set_adapdata(adap, &(dev->channel[dev_nr]));

	strscpy(adap->name, "nGene", sizeof(adap->name));

	adap->algo = &ngene_i2c_algo;
	adap->algo_data = (void *)&(dev->channel[dev_nr]);
	adap->dev.parent = &dev->pci_dev->dev;

	return i2c_add_adapter(adap);
}
Commit	Line	Data
89ee7f4f	1	// SPDX-License-Identifier: GPL-2.0-only
cb1c0f8e DH	2	/*
	3	* ngene-i2c.c: nGene PCIe bridge driver i2c functions
	4	*
	5	* Copyright (C) 2005-2007 Micronas
	6	*
	7	* Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
	8	* Modifications for new nGene firmware,
	9	* support for EEPROM-copying,
	10	* support for new dual DVB-S2 card prototype
cb1c0f8e DH	11	*/
	12
	13	/* FIXME - some of these can probably be removed */
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/delay.h>
	17	#include <linux/slab.h>
	18	#include <linux/poll.h>
	19	#include <linux/io.h>
	20	#include <asm/div64.h>
	21	#include <linux/pci.h>
	22	#include <linux/pci_ids.h>
cb1c0f8e	23	#include <linux/timer.h>
cb1c0f8e DH	24	#include <linux/byteorder/generic.h>
	25	#include <linux/firmware.h>
	26	#include <linux/vmalloc.h>
	27
	28	#include "ngene.h"
	29
	30	/* Firmware command for i2c operations */
	31	static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
	32	u8 out, u8 outlen, u8 in, u8 inlen, int flag)
	33	{
	34	struct ngene_command com;
	35
	36	com.cmd.hdr.Opcode = CMD_I2C_READ;
	37	com.cmd.hdr.Length = outlen + 3;
	38	com.cmd.I2CRead.Device = adr << 1;
	39	memcpy(com.cmd.I2CRead.Data, out, outlen);
	40	com.cmd.I2CRead.Data[outlen] = inlen;
	41	com.cmd.I2CRead.Data[outlen + 1] = 0;
	42	com.in_len = outlen + 3;
	43	com.out_len = inlen + 1;
	44
	45	if (ngene_command(dev, &com) < 0)
	46	return -EIO;
	47
	48	if ((com.cmd.raw8[0] >> 1) != adr)
	49	return -EIO;
	50
	51	if (flag)
	52	memcpy(in, com.cmd.raw8, inlen + 1);
	53	else
	54	memcpy(in, com.cmd.raw8 + 1, inlen);
	55	return 0;
	56	}
	57
	58	static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
	59	u8 *out, u8 outlen)
	60	{
	61	struct ngene_command com;
	62
	63
	64	com.cmd.hdr.Opcode = CMD_I2C_WRITE;
	65	com.cmd.hdr.Length = outlen + 1;
	66	com.cmd.I2CRead.Device = adr << 1;
	67	memcpy(com.cmd.I2CRead.Data, out, outlen);
	68	com.in_len = outlen + 1;
	69	com.out_len = 1;
	70
	71	if (ngene_command(dev, &com) < 0)
	72	return -EIO;
	73
	74	if (com.cmd.raw8[0] == 1)
	75	return -EIO;
	76
	77	return 0;
	78	}
	79
	80	static void ngene_i2c_set_bus(struct ngene *dev, int bus)
	81	{
	82	if (!(dev->card_info->i2c_access & 2))
	83	return;
	84	if (dev->i2c_current_bus == bus)
	85	return;
	86
	87	switch (bus) {
88	case 0:
89	ngene_command_gpio_set(dev, 3, 0);
90	ngene_command_gpio_set(dev, 2, 1);
91	break;
92
93	case 1:
94	ngene_command_gpio_set(dev, 2, 0);
95	ngene_command_gpio_set(dev, 3, 1);
96	break;
97	}
98	dev->i2c_current_bus = bus;
99	}
100
101	static int ngene_i2c_master_xfer(struct i2c_adapter *adapter,
102	struct i2c_msg msg[], int num)
103	{
104	struct ngene_channel *chan =
105	(struct ngene_channel *)i2c_get_adapdata(adapter);
106	struct ngene *dev = chan->dev;
107
bd7a85d3	108	mutex_lock(&dev->i2c_switch_mutex);
cb1c0f8e DH	109	ngene_i2c_set_bus(dev, chan->number);
	110
	111	if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD))
	112	if (!ngene_command_i2c_read(dev, msg[0].addr,
	113	msg[0].buf, msg[0].len,
	114	msg[1].buf, msg[1].len, 0))
	115	goto done;
	116
	117	if (num == 1 && !(msg[0].flags & I2C_M_RD))
	118	if (!ngene_command_i2c_write(dev, msg[0].addr,
	119	msg[0].buf, msg[0].len))
	120	goto done;
	121	if (num == 1 && (msg[0].flags & I2C_M_RD))
	122	if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0,
	123	msg[0].buf, msg[0].len, 0))
	124	goto done;
	125
bd7a85d3	126	mutex_unlock(&dev->i2c_switch_mutex);
cb1c0f8e DH	127	return -EIO;
	128
	129	done:
bd7a85d3	130	mutex_unlock(&dev->i2c_switch_mutex);
cb1c0f8e DH	131	return num;
	132	}
	133
	134
	135	static u32 ngene_i2c_functionality(struct i2c_adapter *adap)
	136	{
643f06fb	137	return I2C_FUNC_I2C \| I2C_FUNC_SMBUS_EMUL;
cb1c0f8e DH	138	}
cb1c0f8e DH	139
62055056	140	static const struct i2c_algorithm ngene_i2c_algo = {
cb1c0f8e DH	141	.master_xfer = ngene_i2c_master_xfer,
	142	.functionality = ngene_i2c_functionality,
	143	};
	144
	145	int ngene_i2c_init(struct ngene *dev, int dev_nr)
	146	{
	147	struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter);
	148
	149	i2c_set_adapdata(adap, &(dev->channel[dev_nr]));
cb1c0f8e	150
cc1e6315	151	strscpy(adap->name, "nGene", sizeof(adap->name));
cb1c0f8e DH	152
	153	adap->algo = &ngene_i2c_algo;
	154	adap->algo_data = (void *)&(dev->channel[dev_nr]);
	155	adap->dev.parent = &dev->pci_dev->dev;
	156
	157	return i2c_add_adapter(adap);
	158	}
	159