mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-03-22 07:27:12 +08:00
bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
519 lines
13 KiB
C
519 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the Diolan u2c-12 USB-I2C adapter
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*
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* Copyright (c) 2010-2011 Ericsson AB
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*
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* Derived from:
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* i2c-tiny-usb.c
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* Copyright (C) 2006-2007 Till Harbaum (Till@Harbaum.org)
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/i2c.h>
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#define DRIVER_NAME "i2c-diolan-u2c"
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#define USB_VENDOR_ID_DIOLAN 0x0abf
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#define USB_DEVICE_ID_DIOLAN_U2C 0x3370
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/* commands via USB, must match command ids in the firmware */
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#define CMD_I2C_READ 0x01
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#define CMD_I2C_WRITE 0x02
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#define CMD_I2C_SCAN 0x03 /* Returns list of detected devices */
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#define CMD_I2C_RELEASE_SDA 0x04
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#define CMD_I2C_RELEASE_SCL 0x05
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#define CMD_I2C_DROP_SDA 0x06
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#define CMD_I2C_DROP_SCL 0x07
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#define CMD_I2C_READ_SDA 0x08
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#define CMD_I2C_READ_SCL 0x09
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#define CMD_GET_FW_VERSION 0x0a
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#define CMD_GET_SERIAL 0x0b
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#define CMD_I2C_START 0x0c
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#define CMD_I2C_STOP 0x0d
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#define CMD_I2C_REPEATED_START 0x0e
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#define CMD_I2C_PUT_BYTE 0x0f
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#define CMD_I2C_GET_BYTE 0x10
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#define CMD_I2C_PUT_ACK 0x11
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#define CMD_I2C_GET_ACK 0x12
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#define CMD_I2C_PUT_BYTE_ACK 0x13
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#define CMD_I2C_GET_BYTE_ACK 0x14
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#define CMD_I2C_SET_SPEED 0x1b
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#define CMD_I2C_GET_SPEED 0x1c
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#define CMD_I2C_SET_CLK_SYNC 0x24
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#define CMD_I2C_GET_CLK_SYNC 0x25
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#define CMD_I2C_SET_CLK_SYNC_TO 0x26
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#define CMD_I2C_GET_CLK_SYNC_TO 0x27
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#define RESP_OK 0x00
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#define RESP_FAILED 0x01
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#define RESP_BAD_MEMADDR 0x04
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#define RESP_DATA_ERR 0x05
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#define RESP_NOT_IMPLEMENTED 0x06
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#define RESP_NACK 0x07
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#define RESP_TIMEOUT 0x09
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#define U2C_I2C_SPEED_FAST 0 /* 400 kHz */
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#define U2C_I2C_SPEED_STD 1 /* 100 kHz */
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#define U2C_I2C_SPEED_2KHZ 242 /* 2 kHz, minimum speed */
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#define U2C_I2C_SPEED(f) ((DIV_ROUND_UP(1000000, (f)) - 10) / 2 + 1)
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#define U2C_I2C_FREQ(s) (1000000 / (2 * (s - 1) + 10))
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#define DIOLAN_USB_TIMEOUT 100 /* in ms */
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#define DIOLAN_SYNC_TIMEOUT 20 /* in ms */
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#define DIOLAN_OUTBUF_LEN 128
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#define DIOLAN_FLUSH_LEN (DIOLAN_OUTBUF_LEN - 4)
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#define DIOLAN_INBUF_LEN 256 /* Maximum supported receive length */
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/* Structure to hold all of our device specific stuff */
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struct i2c_diolan_u2c {
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u8 obuffer[DIOLAN_OUTBUF_LEN]; /* output buffer */
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u8 ibuffer[DIOLAN_INBUF_LEN]; /* input buffer */
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int ep_in, ep_out; /* Endpoints */
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struct usb_device *usb_dev; /* the usb device for this device */
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struct usb_interface *interface;/* the interface for this device */
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struct i2c_adapter adapter; /* i2c related things */
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int olen; /* Output buffer length */
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int ocount; /* Number of enqueued messages */
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};
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static uint frequency = I2C_MAX_STANDARD_MODE_FREQ; /* I2C clock frequency in Hz */
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module_param(frequency, uint, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(frequency, "I2C clock frequency in hertz");
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/* usb layer */
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/* Send command to device, and get response. */
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static int diolan_usb_transfer(struct i2c_diolan_u2c *dev)
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{
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int ret = 0;
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int actual;
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int i;
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if (!dev->olen || !dev->ocount)
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return -EINVAL;
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ret = usb_bulk_msg(dev->usb_dev,
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usb_sndbulkpipe(dev->usb_dev, dev->ep_out),
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dev->obuffer, dev->olen, &actual,
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DIOLAN_USB_TIMEOUT);
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if (!ret) {
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for (i = 0; i < dev->ocount; i++) {
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int tmpret;
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tmpret = usb_bulk_msg(dev->usb_dev,
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usb_rcvbulkpipe(dev->usb_dev,
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dev->ep_in),
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dev->ibuffer,
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sizeof(dev->ibuffer), &actual,
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DIOLAN_USB_TIMEOUT);
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/*
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* Stop command processing if a previous command
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* returned an error.
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* Note that we still need to retrieve all messages.
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*/
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if (ret < 0)
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continue;
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ret = tmpret;
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if (ret == 0 && actual > 0) {
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switch (dev->ibuffer[actual - 1]) {
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case RESP_NACK:
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/*
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* Return ENXIO if NACK was received as
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* response to the address phase,
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* EIO otherwise
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*/
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ret = i == 1 ? -ENXIO : -EIO;
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break;
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case RESP_TIMEOUT:
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ret = -ETIMEDOUT;
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break;
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case RESP_OK:
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/* strip off return code */
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ret = actual - 1;
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break;
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default:
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ret = -EIO;
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break;
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}
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}
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}
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}
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dev->olen = 0;
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dev->ocount = 0;
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return ret;
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}
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static int diolan_write_cmd(struct i2c_diolan_u2c *dev, bool flush)
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{
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if (flush || dev->olen >= DIOLAN_FLUSH_LEN)
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return diolan_usb_transfer(dev);
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return 0;
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}
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/* Send command (no data) */
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static int diolan_usb_cmd(struct i2c_diolan_u2c *dev, u8 command, bool flush)
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{
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dev->obuffer[dev->olen++] = command;
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dev->ocount++;
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return diolan_write_cmd(dev, flush);
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}
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/* Send command with one byte of data */
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static int diolan_usb_cmd_data(struct i2c_diolan_u2c *dev, u8 command, u8 data,
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bool flush)
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{
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dev->obuffer[dev->olen++] = command;
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dev->obuffer[dev->olen++] = data;
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dev->ocount++;
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return diolan_write_cmd(dev, flush);
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}
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/* Send command with two bytes of data */
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static int diolan_usb_cmd_data2(struct i2c_diolan_u2c *dev, u8 command, u8 d1,
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u8 d2, bool flush)
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{
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dev->obuffer[dev->olen++] = command;
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dev->obuffer[dev->olen++] = d1;
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dev->obuffer[dev->olen++] = d2;
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dev->ocount++;
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return diolan_write_cmd(dev, flush);
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}
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/*
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* Flush input queue.
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* If we don't do this at startup and the controller has queued up
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* messages which were not retrieved, it will stop responding
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* at some point.
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*/
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static void diolan_flush_input(struct i2c_diolan_u2c *dev)
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{
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int i;
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for (i = 0; i < 10; i++) {
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int actual = 0;
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int ret;
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ret = usb_bulk_msg(dev->usb_dev,
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usb_rcvbulkpipe(dev->usb_dev, dev->ep_in),
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dev->ibuffer, sizeof(dev->ibuffer), &actual,
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DIOLAN_USB_TIMEOUT);
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if (ret < 0 || actual == 0)
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break;
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}
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if (i == 10)
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dev_err(&dev->interface->dev, "Failed to flush input buffer\n");
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}
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static int diolan_i2c_start(struct i2c_diolan_u2c *dev)
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{
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return diolan_usb_cmd(dev, CMD_I2C_START, false);
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}
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static int diolan_i2c_repeated_start(struct i2c_diolan_u2c *dev)
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{
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return diolan_usb_cmd(dev, CMD_I2C_REPEATED_START, false);
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}
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static int diolan_i2c_stop(struct i2c_diolan_u2c *dev)
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{
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return diolan_usb_cmd(dev, CMD_I2C_STOP, true);
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}
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static int diolan_i2c_get_byte_ack(struct i2c_diolan_u2c *dev, bool ack,
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u8 *byte)
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{
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int ret;
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ret = diolan_usb_cmd_data(dev, CMD_I2C_GET_BYTE_ACK, ack, true);
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if (ret > 0)
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*byte = dev->ibuffer[0];
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else if (ret == 0)
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ret = -EIO;
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return ret;
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}
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static int diolan_i2c_put_byte_ack(struct i2c_diolan_u2c *dev, u8 byte)
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{
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return diolan_usb_cmd_data(dev, CMD_I2C_PUT_BYTE_ACK, byte, false);
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}
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static int diolan_set_speed(struct i2c_diolan_u2c *dev, u8 speed)
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{
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return diolan_usb_cmd_data(dev, CMD_I2C_SET_SPEED, speed, true);
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}
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/* Enable or disable clock synchronization (stretching) */
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static int diolan_set_clock_synch(struct i2c_diolan_u2c *dev, bool enable)
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{
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return diolan_usb_cmd_data(dev, CMD_I2C_SET_CLK_SYNC, enable, true);
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}
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/* Set clock synchronization timeout in ms */
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static int diolan_set_clock_synch_timeout(struct i2c_diolan_u2c *dev, int ms)
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{
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int to_val = ms * 10;
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return diolan_usb_cmd_data2(dev, CMD_I2C_SET_CLK_SYNC_TO,
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to_val & 0xff, (to_val >> 8) & 0xff, true);
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}
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static void diolan_fw_version(struct i2c_diolan_u2c *dev)
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{
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int ret;
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ret = diolan_usb_cmd(dev, CMD_GET_FW_VERSION, true);
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if (ret >= 2)
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dev_info(&dev->interface->dev,
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"Diolan U2C firmware version %u.%u\n",
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(unsigned int)dev->ibuffer[0],
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(unsigned int)dev->ibuffer[1]);
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}
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static void diolan_get_serial(struct i2c_diolan_u2c *dev)
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{
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int ret;
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u32 serial;
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ret = diolan_usb_cmd(dev, CMD_GET_SERIAL, true);
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if (ret >= 4) {
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serial = le32_to_cpu(*(u32 *)dev->ibuffer);
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dev_info(&dev->interface->dev,
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"Diolan U2C serial number %u\n", serial);
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}
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}
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static int diolan_init(struct i2c_diolan_u2c *dev)
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{
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int speed, ret;
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if (frequency >= 2 * I2C_MAX_STANDARD_MODE_FREQ) {
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speed = U2C_I2C_SPEED_FAST;
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frequency = I2C_MAX_FAST_MODE_FREQ;
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} else if (frequency >= I2C_MAX_STANDARD_MODE_FREQ || frequency == 0) {
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speed = U2C_I2C_SPEED_STD;
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frequency = I2C_MAX_STANDARD_MODE_FREQ;
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} else {
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speed = U2C_I2C_SPEED(frequency);
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if (speed > U2C_I2C_SPEED_2KHZ)
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speed = U2C_I2C_SPEED_2KHZ;
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frequency = U2C_I2C_FREQ(speed);
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}
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dev_info(&dev->interface->dev,
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"Diolan U2C at USB bus %03d address %03d speed %d Hz\n",
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dev->usb_dev->bus->busnum, dev->usb_dev->devnum, frequency);
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diolan_flush_input(dev);
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diolan_fw_version(dev);
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diolan_get_serial(dev);
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/* Set I2C speed */
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ret = diolan_set_speed(dev, speed);
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if (ret < 0)
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return ret;
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/* Configure I2C clock synchronization */
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ret = diolan_set_clock_synch(dev, speed != U2C_I2C_SPEED_FAST);
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if (ret < 0)
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return ret;
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if (speed != U2C_I2C_SPEED_FAST)
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ret = diolan_set_clock_synch_timeout(dev, DIOLAN_SYNC_TIMEOUT);
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return ret;
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}
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/* i2c layer */
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static int diolan_usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
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int num)
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{
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struct i2c_diolan_u2c *dev = i2c_get_adapdata(adapter);
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struct i2c_msg *pmsg;
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int i, j;
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int ret, sret;
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ret = diolan_i2c_start(dev);
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if (ret < 0)
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return ret;
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for (i = 0; i < num; i++) {
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pmsg = &msgs[i];
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if (i) {
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ret = diolan_i2c_repeated_start(dev);
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if (ret < 0)
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goto abort;
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}
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ret = diolan_i2c_put_byte_ack(dev,
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i2c_8bit_addr_from_msg(pmsg));
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if (ret < 0)
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goto abort;
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if (pmsg->flags & I2C_M_RD) {
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for (j = 0; j < pmsg->len; j++) {
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u8 byte;
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bool ack = j < pmsg->len - 1;
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/*
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* Don't send NACK if this is the first byte
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* of a SMBUS_BLOCK message.
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*/
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if (j == 0 && (pmsg->flags & I2C_M_RECV_LEN))
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ack = true;
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ret = diolan_i2c_get_byte_ack(dev, ack, &byte);
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if (ret < 0)
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goto abort;
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/*
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* Adjust count if first received byte is length
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*/
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if (j == 0 && (pmsg->flags & I2C_M_RECV_LEN)) {
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if (byte == 0
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|| byte > I2C_SMBUS_BLOCK_MAX) {
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ret = -EPROTO;
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goto abort;
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}
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pmsg->len += byte;
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}
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pmsg->buf[j] = byte;
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}
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} else {
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for (j = 0; j < pmsg->len; j++) {
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ret = diolan_i2c_put_byte_ack(dev,
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pmsg->buf[j]);
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if (ret < 0)
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goto abort;
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}
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}
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}
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ret = num;
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abort:
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sret = diolan_i2c_stop(dev);
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if (sret < 0 && ret >= 0)
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ret = sret;
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return ret;
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}
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/*
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* Return list of supported functionality.
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*/
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static u32 diolan_usb_func(struct i2c_adapter *a)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
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I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
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}
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static const struct i2c_algorithm diolan_usb_algorithm = {
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.xfer = diolan_usb_xfer,
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.functionality = diolan_usb_func,
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};
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/* device layer */
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static const struct usb_device_id diolan_u2c_table[] = {
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{ USB_DEVICE(USB_VENDOR_ID_DIOLAN, USB_DEVICE_ID_DIOLAN_U2C) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, diolan_u2c_table);
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static void diolan_u2c_free(struct i2c_diolan_u2c *dev)
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{
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usb_put_dev(dev->usb_dev);
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kfree(dev);
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}
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static int diolan_u2c_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct usb_host_interface *hostif = interface->cur_altsetting;
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struct i2c_diolan_u2c *dev;
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int ret;
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if (hostif->desc.bInterfaceNumber != 0
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|| hostif->desc.bNumEndpoints < 2)
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return -ENODEV;
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/* allocate memory for our device state and initialize it */
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dev = kzalloc_obj(*dev);
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if (dev == NULL) {
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ret = -ENOMEM;
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goto error;
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}
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dev->ep_out = hostif->endpoint[0].desc.bEndpointAddress;
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dev->ep_in = hostif->endpoint[1].desc.bEndpointAddress;
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dev->usb_dev = usb_get_dev(interface_to_usbdev(interface));
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dev->interface = interface;
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/* save our data pointer in this interface device */
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usb_set_intfdata(interface, dev);
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/* setup i2c adapter description */
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dev->adapter.owner = THIS_MODULE;
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dev->adapter.class = I2C_CLASS_HWMON;
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dev->adapter.algo = &diolan_usb_algorithm;
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i2c_set_adapdata(&dev->adapter, dev);
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snprintf(dev->adapter.name, sizeof(dev->adapter.name),
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DRIVER_NAME " at bus %03d device %03d",
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dev->usb_dev->bus->busnum, dev->usb_dev->devnum);
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dev->adapter.dev.parent = &dev->interface->dev;
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|
|
|
/* initialize diolan i2c interface */
|
|
ret = diolan_init(dev);
|
|
if (ret < 0) {
|
|
dev_err(&interface->dev, "failed to initialize adapter\n");
|
|
goto error_free;
|
|
}
|
|
|
|
/* and finally attach to i2c layer */
|
|
ret = i2c_add_adapter(&dev->adapter);
|
|
if (ret < 0)
|
|
goto error_free;
|
|
|
|
dev_dbg(&interface->dev, "connected " DRIVER_NAME "\n");
|
|
|
|
return 0;
|
|
|
|
error_free:
|
|
usb_set_intfdata(interface, NULL);
|
|
diolan_u2c_free(dev);
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
static void diolan_u2c_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct i2c_diolan_u2c *dev = usb_get_intfdata(interface);
|
|
|
|
i2c_del_adapter(&dev->adapter);
|
|
usb_set_intfdata(interface, NULL);
|
|
diolan_u2c_free(dev);
|
|
|
|
dev_dbg(&interface->dev, "disconnected\n");
|
|
}
|
|
|
|
static struct usb_driver diolan_u2c_driver = {
|
|
.name = DRIVER_NAME,
|
|
.probe = diolan_u2c_probe,
|
|
.disconnect = diolan_u2c_disconnect,
|
|
.id_table = diolan_u2c_table,
|
|
};
|
|
|
|
module_usb_driver(diolan_u2c_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION(DRIVER_NAME " driver");
|
|
MODULE_LICENSE("GPL");
|