Release 4.11 drivers/media/pci/pt3/pt3_i2c.c

Directory: drivers/media/pci/pt3
/*
 * Earthsoft PT3 driver
 *
 * Copyright (C) 2014 Akihiro Tsukada <tskd08@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/pci.h>

#include "pt3.h"


#define PT3_I2C_BASE  2048

#define PT3_CMD_ADDR_NORMAL 0

#define PT3_CMD_ADDR_INIT_DEMOD  4096

#define PT3_CMD_ADDR_INIT_TUNER  (4096 + 2042)

/* masks for I2C status register */

#define STAT_SEQ_RUNNING 0x1

#define STAT_SEQ_ERROR   0x6

#define STAT_NO_SEQ      0x8


#define PT3_I2C_RUN   (1 << 16)

#define PT3_I2C_RESET (1 << 17)


enum ctl_cmd {
	
I_END,
	
I_ADDRESS,
	
I_CLOCK_L,
	
I_CLOCK_H,
	
I_DATA_L,
	
I_DATA_H,
	
I_RESET,
	
I_SLEEP,
	
I_DATA_L_NOP  = 0x08,
	
I_DATA_H_NOP  = 0x0c,
	
I_DATA_H_READ = 0x0d,
	
I_DATA_H_ACK0 = 0x0e,
	
I_DATA_H_ACK1 = 0x0f,
};




static void cmdbuf_add(struct pt3_i2cbuf *cbuf, enum ctl_cmd cmd)
{
	int buf_idx;

	if ((cbuf->num_cmds % 2) == 0)
		cbuf->tmp = cmd;
	else {
		cbuf->tmp |= cmd << 4;
		buf_idx = cbuf->num_cmds / 2;
		if (buf_idx < ARRAY_SIZE(cbuf->data))
			cbuf->data[buf_idx] = cbuf->tmp;
	}
	cbuf->num_cmds++;
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 82 100.00% 1 100.00%
Total 82 100.00% 1 100.00%



static void put_end(struct pt3_i2cbuf *cbuf)
{
	cmdbuf_add(cbuf, I_END);
	if (cbuf->num_cmds % 2)
		cmdbuf_add(cbuf, I_END);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static void put_start(struct pt3_i2cbuf *cbuf)
{
	cmdbuf_add(cbuf, I_DATA_H);
	cmdbuf_add(cbuf, I_CLOCK_H);
	cmdbuf_add(cbuf, I_DATA_L);
	cmdbuf_add(cbuf, I_CLOCK_L);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%



static void put_byte_write(struct pt3_i2cbuf *cbuf, u8 val)
{
	u8 mask;

	mask = 0x80;
	for (mask = 0x80; mask > 0; mask >>= 1)
		cmdbuf_add(cbuf, (val & mask) ? I_DATA_H_NOP : I_DATA_L_NOP);
	cmdbuf_add(cbuf, I_DATA_H_ACK0);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%



static void put_byte_read(struct pt3_i2cbuf *cbuf, u32 size)
{
	int i, j;

	for (i = 0; i < size; i++) {
		for (j = 0; j < 8; j++)
			cmdbuf_add(cbuf, I_DATA_H_READ);
		cmdbuf_add(cbuf, (i == size - 1) ? I_DATA_H_NOP : I_DATA_L_NOP);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 71 100.00% 1 100.00%
Total 71 100.00% 1 100.00%



static void put_stop(struct pt3_i2cbuf *cbuf)
{
	cmdbuf_add(cbuf, I_DATA_L);
	cmdbuf_add(cbuf, I_CLOCK_H);
	cmdbuf_add(cbuf, I_DATA_H);
}


Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%

/* translates msgs to internal commands for bit-banging */


static void translate(struct pt3_i2cbuf *cbuf, struct i2c_msg *msgs, int num)
{
	int i, j;
	bool rd;

	cbuf->num_cmds = 0;
	for (i = 0; i < num; i++) {
		rd = !!(msgs[i].flags & I2C_M_RD);
		put_start(cbuf);
		put_byte_write(cbuf, msgs[i].addr << 1 | rd);
		if (rd)
			put_byte_read(cbuf, msgs[i].len);
		else
			for (j = 0; j < msgs[i].len; j++)
				put_byte_write(cbuf, msgs[i].buf[j]);
	}
	if (num > 0) {
		put_stop(cbuf);
		put_end(cbuf);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 152 100.00% 1 100.00%
Total 152 100.00% 1 100.00%



static int wait_i2c_result(struct pt3_board *pt3, u32 *result, int max_wait)
{
	int i;
	u32 v;

	for (i = 0; i < max_wait; i++) {
		v = ioread32(pt3->regs[0] + REG_I2C_R);
		if (!(v & STAT_SEQ_RUNNING))
			break;
		usleep_range(500, 750);
	}
	if (i >= max_wait)
		return -EIO;
	if (result)
		*result = v;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 92 100.00% 1 100.00%
Total 92 100.00% 1 100.00%

/* send [pre-]translated i2c msgs stored at addr */


static int send_i2c_cmd(struct pt3_board *pt3, u32 addr)
{
	u32 ret;

	/* make sure that previous transactions had finished */
	if (wait_i2c_result(pt3, NULL, 50)) {
		dev_warn(&pt3->pdev->dev, "(%s) prev. transaction stalled\n",
				__func__);
		return -EIO;
	}

	iowrite32(PT3_I2C_RUN | addr, pt3->regs[0] + REG_I2C_W);
	usleep_range(200, 300);
	/* wait for the current transaction to finish */
	if (wait_i2c_result(pt3, &ret, 500) || (ret & STAT_SEQ_ERROR)) {
		dev_warn(&pt3->pdev->dev, "(%s) failed.\n", __func__);
		return -EIO;
	}
	return 0;
}


Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 114 100.00% 1 100.00%
Total 114 100.00% 1 100.00%

/* init commands for each demod are combined into one transaction
 *  and hidden in ROM with the address PT3_CMD_ADDR_INIT_DEMOD.
 */


int  pt3_init_all_demods(struct pt3_board *pt3)
{
	ioread32(pt3->regs[0] + REG_I2C_R);
	return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_DEMOD);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%

/* init commands for two ISDB-T tuners are hidden in ROM. */


int  pt3_init_all_mxl301rf(struct pt3_board *pt3)
{
	usleep_range(1000, 2000);
	return send_i2c_cmd(pt3, PT3_CMD_ADDR_INIT_TUNER);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



void pt3_i2c_reset(struct pt3_board *pt3)
{
	iowrite32(PT3_I2C_RESET, pt3->regs[0] + REG_I2C_W);
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%

/*
 * I2C algorithm
 */

int

pt3_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
	struct pt3_board *pt3;
	struct pt3_i2cbuf *cbuf;
	int i;
	void __iomem *p;

	pt3 = i2c_get_adapdata(adap);
	cbuf = pt3->i2c_buf;

	for (i = 0; i < num; i++)
		if (msgs[i].flags & I2C_M_RECV_LEN) {
			dev_warn(&pt3->pdev->dev,
				"(%s) I2C_M_RECV_LEN not supported.\n",
				__func__);
			return -EINVAL;
		}

	translate(cbuf, msgs, num);
	memcpy_toio(pt3->regs[1] + PT3_I2C_BASE + PT3_CMD_ADDR_NORMAL / 2,
			cbuf->data, cbuf->num_cmds);

	if (send_i2c_cmd(pt3, PT3_CMD_ADDR_NORMAL) < 0)
		return -EIO;

	p = pt3->regs[1] + PT3_I2C_BASE;
	for (i = 0; i < num; i++)
		if ((msgs[i].flags & I2C_M_RD) && msgs[i].len > 0) {
			memcpy_fromio(msgs[i].buf, p, msgs[i].len);
			p += msgs[i].len;
		}

	return num;
}

Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 220 100.00% 1 100.00%
Total 220 100.00% 1 100.00%



u32 pt3_i2c_functionality(struct i2c_adapter *adap)
{
	return I2C_FUNC_I2C;
}
Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 13 100.00% 1 100.00%
Total 13 100.00% 1 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Akihiro Tsukada 1085 100.00% 1 100.00%
Total 1085 100.00% 1 100.00%
Directory: drivers/media/pci/pt3

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Akihiro Tsukada	82	100.00%	1	100.00%
Total	82	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/media/pci/pt3/pt3_i2c.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
