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Based on 3 normalized pattern(s): 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 either version 2 of the license or at your option any later version 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 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 either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the NXP SAA7164 PCIe bridge
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*
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* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include "saa7164.h"
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static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
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{
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struct saa7164_i2c *bus = i2c_adap->algo_data;
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struct saa7164_dev *dev = bus->dev;
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int i, retval = 0;
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dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
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for (i = 0 ; i < num; i++) {
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dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
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__func__, num, msgs[i].addr, msgs[i].len);
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if (msgs[i].flags & I2C_M_RD) {
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retval = saa7164_api_i2c_read(bus,
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msgs[i].addr,
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0 /* reglen */,
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NULL /* reg */, msgs[i].len, msgs[i].buf);
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} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
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msgs[i].addr == msgs[i + 1].addr) {
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/* write then read from same address */
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retval = saa7164_api_i2c_read(bus, msgs[i].addr,
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msgs[i].len, msgs[i].buf,
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msgs[i+1].len, msgs[i+1].buf
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);
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i++;
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if (retval < 0)
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goto err;
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} else {
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/* write */
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retval = saa7164_api_i2c_write(bus, msgs[i].addr,
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msgs[i].len, msgs[i].buf);
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}
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if (retval < 0)
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goto err;
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}
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return num;
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err:
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return retval;
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}
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static u32 saa7164_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm saa7164_i2c_algo_template = {
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.master_xfer = i2c_xfer,
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.functionality = saa7164_functionality,
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};
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/* ----------------------------------------------------------------------- */
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static const struct i2c_adapter saa7164_i2c_adap_template = {
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.name = "saa7164",
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.owner = THIS_MODULE,
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.algo = &saa7164_i2c_algo_template,
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};
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static const struct i2c_client saa7164_i2c_client_template = {
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.name = "saa7164 internal",
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};
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int saa7164_i2c_register(struct saa7164_i2c *bus)
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{
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struct saa7164_dev *dev = bus->dev;
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dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
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bus->i2c_adap = saa7164_i2c_adap_template;
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bus->i2c_client = saa7164_i2c_client_template;
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bus->i2c_adap.dev.parent = &dev->pci->dev;
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strscpy(bus->i2c_adap.name, bus->dev->name,
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sizeof(bus->i2c_adap.name));
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bus->i2c_adap.algo_data = bus;
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i2c_set_adapdata(&bus->i2c_adap, bus);
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i2c_add_adapter(&bus->i2c_adap);
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bus->i2c_client.adapter = &bus->i2c_adap;
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if (0 != bus->i2c_rc)
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printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
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dev->name, bus->nr);
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return bus->i2c_rc;
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}
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int saa7164_i2c_unregister(struct saa7164_i2c *bus)
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{
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i2c_del_adapter(&bus->i2c_adap);
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return 0;
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}
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