868 lines
25 KiB
C
Executable File
868 lines
25 KiB
C
Executable File
/*
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* I2C multiplexer
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*
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* Copyright (C) 2014 Accton Technology Corporation.
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*
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* This module supports the accton cpld that hold the channel select
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* mechanism for other i2c slave devices, such as SFP.
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* This includes the:
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* Accton as6712_32x CPLD1/CPLD2/CPLD3
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*
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* Based on:
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* pca954x.c from Kumar Gala <galak@kernel.crashing.org>
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* Copyright (C) 2006
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*
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* Based on:
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* pca954x.c from Ken Harrenstien
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* Copyright (C) 2004 Google, Inc. (Ken Harrenstien)
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*
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* Based on:
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* i2c-virtual_cb.c from Brian Kuschak <bkuschak@yahoo.com>
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* and
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* pca9540.c from Jean Delvare <khali@linux-fr.org>.
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/i2c.h>
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#include <linux/i2c-mux.h>
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#include <linux/version.h>
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#include <linux/stat.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/delay.h>
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#define I2C_RW_RETRY_COUNT 10
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#define I2C_RW_RETRY_INTERVAL 60 /* ms */
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#define NUM_OF_CPLD1_CHANS 0x0
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#define NUM_OF_CPLD2_CHANS 0x10
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#define NUM_OF_CPLD3_CHANS 0x10
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#define CPLD_CHANNEL_SELECT_REG 0x2
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#define CPLD_DESELECT_CHANNEL 0xFF
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#define ACCTON_I2C_CPLD_MUX_MAX_NCHANS NUM_OF_CPLD3_CHANS
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static LIST_HEAD(cpld_client_list);
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static struct mutex list_lock;
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struct cpld_client_node {
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struct i2c_client *client;
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struct list_head list;
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};
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enum cpld_mux_type {
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as6712_32x_cpld2,
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as6712_32x_cpld3,
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as6712_32x_cpld1
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};
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struct as6712_32x_cpld_data {
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enum cpld_mux_type type;
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struct i2c_client *client;
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u8 last_chan; /* last register value */
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struct device *hwmon_dev;
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struct mutex update_lock;
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};
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struct chip_desc {
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u8 nchans;
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u8 deselectChan;
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};
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/* Provide specs for the PCA954x types we know about */
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static const struct chip_desc chips[] = {
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[as6712_32x_cpld1] = {
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.nchans = NUM_OF_CPLD1_CHANS,
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.deselectChan = NUM_OF_CPLD1_CHANS,
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},
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[as6712_32x_cpld2] = {
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.nchans = NUM_OF_CPLD2_CHANS,
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.deselectChan = NUM_OF_CPLD2_CHANS,
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},
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[as6712_32x_cpld3] = {
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.nchans = NUM_OF_CPLD3_CHANS,
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.deselectChan = NUM_OF_CPLD3_CHANS,
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}
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};
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static const struct i2c_device_id as6712_32x_cpld_mux_id[] = {
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{ "as6712_32x_cpld1", as6712_32x_cpld1 },
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{ "as6712_32x_cpld2", as6712_32x_cpld2 },
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{ "as6712_32x_cpld3", as6712_32x_cpld3 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, as6712_32x_cpld_mux_id);
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#define TRANSCEIVER_PRESENT_ATTR_ID(index) MODULE_PRESENT_##index
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#define TRANSCEIVER_TXDISABLE_ATTR_ID(index) MODULE_TXDISABLE_##index
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#define TRANSCEIVER_RXLOS_ATTR_ID(index) MODULE_RXLOS_##index
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#define TRANSCEIVER_TXFAULT_ATTR_ID(index) MODULE_TXFAULT_##index
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#define TRANSCEIVER_LPMODE_ATTR_ID(index) MODULE_LPMODE_##index
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#define TRANSCEIVER_RESET_ATTR_ID(index) MODULE_RESET_##index
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enum as6712_32x_cpld_sysfs_attributes {
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CPLD_VERSION,
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ACCESS,
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MODULE_PRESENT_ALL,
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MODULE_RXLOS_ALL,
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/* transceiver attributes */
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TRANSCEIVER_PRESENT_ATTR_ID(1),
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TRANSCEIVER_PRESENT_ATTR_ID(2),
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TRANSCEIVER_PRESENT_ATTR_ID(3),
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TRANSCEIVER_PRESENT_ATTR_ID(4),
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TRANSCEIVER_PRESENT_ATTR_ID(5),
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TRANSCEIVER_PRESENT_ATTR_ID(6),
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TRANSCEIVER_PRESENT_ATTR_ID(7),
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TRANSCEIVER_PRESENT_ATTR_ID(8),
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TRANSCEIVER_PRESENT_ATTR_ID(9),
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TRANSCEIVER_PRESENT_ATTR_ID(10),
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TRANSCEIVER_PRESENT_ATTR_ID(11),
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TRANSCEIVER_PRESENT_ATTR_ID(12),
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TRANSCEIVER_PRESENT_ATTR_ID(13),
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TRANSCEIVER_PRESENT_ATTR_ID(14),
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TRANSCEIVER_PRESENT_ATTR_ID(15),
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TRANSCEIVER_PRESENT_ATTR_ID(16),
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TRANSCEIVER_PRESENT_ATTR_ID(17),
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TRANSCEIVER_PRESENT_ATTR_ID(18),
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TRANSCEIVER_PRESENT_ATTR_ID(19),
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TRANSCEIVER_PRESENT_ATTR_ID(20),
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TRANSCEIVER_PRESENT_ATTR_ID(21),
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TRANSCEIVER_PRESENT_ATTR_ID(22),
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TRANSCEIVER_PRESENT_ATTR_ID(23),
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TRANSCEIVER_PRESENT_ATTR_ID(24),
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TRANSCEIVER_PRESENT_ATTR_ID(25),
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TRANSCEIVER_PRESENT_ATTR_ID(26),
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TRANSCEIVER_PRESENT_ATTR_ID(27),
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TRANSCEIVER_PRESENT_ATTR_ID(28),
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TRANSCEIVER_PRESENT_ATTR_ID(29),
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TRANSCEIVER_PRESENT_ATTR_ID(30),
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TRANSCEIVER_PRESENT_ATTR_ID(31),
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TRANSCEIVER_PRESENT_ATTR_ID(32),
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/*Reset*/
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TRANSCEIVER_RESET_ATTR_ID(1),
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TRANSCEIVER_RESET_ATTR_ID(2),
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TRANSCEIVER_RESET_ATTR_ID(3),
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TRANSCEIVER_RESET_ATTR_ID(4),
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TRANSCEIVER_RESET_ATTR_ID(5),
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TRANSCEIVER_RESET_ATTR_ID(6),
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TRANSCEIVER_RESET_ATTR_ID(7),
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TRANSCEIVER_RESET_ATTR_ID(8),
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TRANSCEIVER_RESET_ATTR_ID(9),
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TRANSCEIVER_RESET_ATTR_ID(10),
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TRANSCEIVER_RESET_ATTR_ID(11),
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TRANSCEIVER_RESET_ATTR_ID(12),
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TRANSCEIVER_RESET_ATTR_ID(13),
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TRANSCEIVER_RESET_ATTR_ID(14),
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TRANSCEIVER_RESET_ATTR_ID(15),
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TRANSCEIVER_RESET_ATTR_ID(16),
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TRANSCEIVER_RESET_ATTR_ID(17),
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TRANSCEIVER_RESET_ATTR_ID(18),
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TRANSCEIVER_RESET_ATTR_ID(19),
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TRANSCEIVER_RESET_ATTR_ID(20),
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TRANSCEIVER_RESET_ATTR_ID(21),
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TRANSCEIVER_RESET_ATTR_ID(22),
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TRANSCEIVER_RESET_ATTR_ID(23),
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TRANSCEIVER_RESET_ATTR_ID(24),
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TRANSCEIVER_RESET_ATTR_ID(25),
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TRANSCEIVER_RESET_ATTR_ID(26),
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TRANSCEIVER_RESET_ATTR_ID(27),
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TRANSCEIVER_RESET_ATTR_ID(28),
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TRANSCEIVER_RESET_ATTR_ID(29),
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TRANSCEIVER_RESET_ATTR_ID(30),
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TRANSCEIVER_RESET_ATTR_ID(31),
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TRANSCEIVER_RESET_ATTR_ID(32),
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TRANSCEIVER_LPMODE_ATTR_ID(1),
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TRANSCEIVER_LPMODE_ATTR_ID(2),
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TRANSCEIVER_LPMODE_ATTR_ID(3),
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TRANSCEIVER_LPMODE_ATTR_ID(4),
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TRANSCEIVER_LPMODE_ATTR_ID(5),
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TRANSCEIVER_LPMODE_ATTR_ID(6),
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TRANSCEIVER_LPMODE_ATTR_ID(7),
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TRANSCEIVER_LPMODE_ATTR_ID(8),
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TRANSCEIVER_LPMODE_ATTR_ID(9),
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TRANSCEIVER_LPMODE_ATTR_ID(10),
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TRANSCEIVER_LPMODE_ATTR_ID(11),
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TRANSCEIVER_LPMODE_ATTR_ID(12),
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TRANSCEIVER_LPMODE_ATTR_ID(13),
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TRANSCEIVER_LPMODE_ATTR_ID(14),
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TRANSCEIVER_LPMODE_ATTR_ID(15),
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TRANSCEIVER_LPMODE_ATTR_ID(16),
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TRANSCEIVER_LPMODE_ATTR_ID(17),
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TRANSCEIVER_LPMODE_ATTR_ID(18),
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TRANSCEIVER_LPMODE_ATTR_ID(19),
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TRANSCEIVER_LPMODE_ATTR_ID(20),
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TRANSCEIVER_LPMODE_ATTR_ID(21),
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TRANSCEIVER_LPMODE_ATTR_ID(22),
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TRANSCEIVER_LPMODE_ATTR_ID(23),
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TRANSCEIVER_LPMODE_ATTR_ID(24),
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TRANSCEIVER_LPMODE_ATTR_ID(25),
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TRANSCEIVER_LPMODE_ATTR_ID(26),
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TRANSCEIVER_LPMODE_ATTR_ID(27),
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TRANSCEIVER_LPMODE_ATTR_ID(28),
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TRANSCEIVER_LPMODE_ATTR_ID(29),
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TRANSCEIVER_LPMODE_ATTR_ID(30),
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TRANSCEIVER_LPMODE_ATTR_ID(31),
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TRANSCEIVER_LPMODE_ATTR_ID(32),
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};
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/* sysfs attributes for hwmon
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*/
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static ssize_t show_status(struct device *dev, struct device_attribute *da,
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char *buf);
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static ssize_t show_present_all(struct device *dev, struct device_attribute *da,
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char *buf);
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static ssize_t set_status(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count);
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static ssize_t access(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count);
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static ssize_t show_version(struct device *dev, struct device_attribute *da,
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char *buf);
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static int as6712_32x_cpld_read_internal(struct i2c_client *client, u8 reg);
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static int as6712_32x_cpld_write_internal(struct i2c_client *client, u8 reg, u8 value);
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/* transceiver attributes */
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#define DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(index) \
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static SENSOR_DEVICE_ATTR(module_present_##index, S_IRUGO, show_status, NULL, MODULE_PRESENT_##index); \
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static SENSOR_DEVICE_ATTR(module_reset_##index, S_IWUSR|S_IRUGO, show_status, set_status, MODULE_RESET_##index); \
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static SENSOR_DEVICE_ATTR(module_lp_mode_##index, S_IRUGO | S_IWUSR, show_status, set_status, MODULE_LPMODE_##index)
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#define DECLARE_TRANSCEIVER_ATTR(index) \
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&sensor_dev_attr_module_present_##index.dev_attr.attr, \
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&sensor_dev_attr_module_reset_##index.dev_attr.attr, \
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&sensor_dev_attr_module_lp_mode_##index.dev_attr.attr
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static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, CPLD_VERSION);
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static SENSOR_DEVICE_ATTR(access, S_IWUSR, NULL, access, ACCESS);
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/* transceiver attributes */
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static SENSOR_DEVICE_ATTR(module_present_all, S_IRUGO, show_present_all, NULL, MODULE_PRESENT_ALL);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(1);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(2);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(3);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(4);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(5);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(6);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(7);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(8);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(9);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(10);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(11);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(12);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(13);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(14);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(15);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(16);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(17);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(18);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(19);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(20);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(21);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(22);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(23);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(24);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(25);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(26);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(27);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(28);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(29);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(30);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(31);
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DECLARE_TRANSCEIVER_SENSOR_DEVICE_ATTR(32);
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static struct attribute *as6712_32x_cpld1_attributes[] = {
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&sensor_dev_attr_version.dev_attr.attr,
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&sensor_dev_attr_access.dev_attr.attr,
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NULL
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};
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static const struct attribute_group as6712_32x_cpld1_group = {
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.attrs = as6712_32x_cpld1_attributes,
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};
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static struct attribute *as6712_32x_cpld2_attributes[] = {
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&sensor_dev_attr_version.dev_attr.attr,
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&sensor_dev_attr_access.dev_attr.attr,
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/* transceiver attributes */
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&sensor_dev_attr_module_present_all.dev_attr.attr,
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DECLARE_TRANSCEIVER_ATTR(1),
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DECLARE_TRANSCEIVER_ATTR(2),
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DECLARE_TRANSCEIVER_ATTR(3),
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DECLARE_TRANSCEIVER_ATTR(4),
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DECLARE_TRANSCEIVER_ATTR(5),
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DECLARE_TRANSCEIVER_ATTR(6),
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DECLARE_TRANSCEIVER_ATTR(7),
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DECLARE_TRANSCEIVER_ATTR(8),
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DECLARE_TRANSCEIVER_ATTR(9),
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DECLARE_TRANSCEIVER_ATTR(10),
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DECLARE_TRANSCEIVER_ATTR(11),
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DECLARE_TRANSCEIVER_ATTR(12),
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DECLARE_TRANSCEIVER_ATTR(13),
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DECLARE_TRANSCEIVER_ATTR(14),
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DECLARE_TRANSCEIVER_ATTR(15),
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DECLARE_TRANSCEIVER_ATTR(16),
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NULL
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};
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static const struct attribute_group as6712_32x_cpld2_group = {
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.attrs = as6712_32x_cpld2_attributes,
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};
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static struct attribute *as6712_32x_cpld3_attributes[] = {
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&sensor_dev_attr_version.dev_attr.attr,
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&sensor_dev_attr_access.dev_attr.attr,
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/* transceiver attributes */
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&sensor_dev_attr_module_present_all.dev_attr.attr,
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DECLARE_TRANSCEIVER_ATTR(17),
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DECLARE_TRANSCEIVER_ATTR(18),
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DECLARE_TRANSCEIVER_ATTR(19),
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DECLARE_TRANSCEIVER_ATTR(20),
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DECLARE_TRANSCEIVER_ATTR(21),
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DECLARE_TRANSCEIVER_ATTR(22),
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DECLARE_TRANSCEIVER_ATTR(23),
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DECLARE_TRANSCEIVER_ATTR(24),
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DECLARE_TRANSCEIVER_ATTR(25),
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DECLARE_TRANSCEIVER_ATTR(26),
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DECLARE_TRANSCEIVER_ATTR(27),
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DECLARE_TRANSCEIVER_ATTR(28),
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DECLARE_TRANSCEIVER_ATTR(29),
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DECLARE_TRANSCEIVER_ATTR(30),
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DECLARE_TRANSCEIVER_ATTR(31),
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DECLARE_TRANSCEIVER_ATTR(32),
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NULL
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};
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static const struct attribute_group as6712_32x_cpld3_group = {
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.attrs = as6712_32x_cpld3_attributes,
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};
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static ssize_t show_present_all(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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int i, status;
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u8 values[2] = {0};
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u8 regs[] = {0xA, 0xB};
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_mux_core *muxc = i2c_get_clientdata(client);
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struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
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|
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mutex_lock(&data->update_lock);
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|
|
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for (i = 0; i < ARRAY_SIZE(regs); i++) {
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status = as6712_32x_cpld_read_internal(client, regs[i]);
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|
|
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if (status < 0) {
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goto exit;
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}
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|
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values[i] = ~(u8)status;
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}
|
|
|
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mutex_unlock(&data->update_lock);
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|
|
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/* Return values 1 -> 32 in order */
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return sprintf(buf, "%.2x %.2x\n", values[0], values[1]);
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|
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exit:
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mutex_unlock(&data->update_lock);
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return status;
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|
}
|
|
|
|
static ssize_t set_status(struct device *dev, struct device_attribute *da,
|
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const char *buf, size_t count)
|
|
{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct i2c_client *client = to_i2c_client(dev);
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struct i2c_mux_core *muxc = i2c_get_clientdata(client);
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struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
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|
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int status = 0, reverse = 0;
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u8 reg = 0, mask = 0;
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u32 val, para;
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if (sscanf(buf, "%d", ¶) != 1) {
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return -EINVAL;
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}
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|
|
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switch (attr->index) {
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case MODULE_RESET_1 ... MODULE_RESET_32:
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reg = 0x4 + (((attr->index - MODULE_RESET_1)/8)%2);
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mask = 0x1 << ((attr->index - MODULE_RESET_1)%8);
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reverse = 1;
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break;
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case MODULE_LPMODE_1 ... MODULE_LPMODE_32:
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reg = 0xC + (((attr->index - MODULE_LPMODE_1)/8)%2);
|
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mask = 0x1 << ((attr->index - MODULE_LPMODE_1)%8);
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break;
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default:
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return 0;
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}
|
|
|
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mutex_lock(&data->update_lock);
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status = as6712_32x_cpld_read_internal(client, reg);
|
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if (unlikely(status < 0)) {
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goto exit;
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}
|
|
|
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val = status & ~mask;
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if (!para && reverse) { /*0 means reset*/
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val |= mask;
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}
|
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|
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status = as6712_32x_cpld_write_internal(client, reg, val);
|
|
if (unlikely(status < 0)) {
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goto exit;
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|
}
|
|
mutex_unlock(&data->update_lock);
|
|
return count;
|
|
|
|
exit:
|
|
mutex_unlock(&data->update_lock);
|
|
return status;
|
|
}
|
|
static ssize_t show_status(struct device *dev, struct device_attribute *da,
|
|
char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
|
|
struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
|
|
int status = 0;
|
|
u8 reg = 0, mask = 0;
|
|
|
|
switch (attr->index) {
|
|
case MODULE_PRESENT_1 ... MODULE_PRESENT_8:
|
|
reg = 0xA;
|
|
mask = 0x1 << (attr->index - MODULE_PRESENT_1);
|
|
break;
|
|
case MODULE_PRESENT_9 ... MODULE_PRESENT_16:
|
|
reg = 0xB;
|
|
mask = 0x1 << (attr->index - MODULE_PRESENT_9);
|
|
break;
|
|
case MODULE_PRESENT_17 ... MODULE_PRESENT_24:
|
|
reg = 0xA;
|
|
mask = 0x1 << (attr->index - MODULE_PRESENT_17);
|
|
break;
|
|
case MODULE_PRESENT_25 ... MODULE_PRESENT_32:
|
|
reg = 0xB;
|
|
mask = 0x1 << (attr->index - MODULE_PRESENT_25);
|
|
break;
|
|
case MODULE_RESET_1 ... MODULE_RESET_32:
|
|
reg = 0x4 + (((attr->index - MODULE_RESET_1)/8)%2);
|
|
mask = 0x1 << ((attr->index - MODULE_RESET_1)%8);
|
|
break;
|
|
case MODULE_LPMODE_1 ... MODULE_LPMODE_32:
|
|
reg = 0xC + (((attr->index - MODULE_LPMODE_1)/8)%2);
|
|
mask = 0x1 << ((attr->index - MODULE_LPMODE_1)%8);
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
mutex_lock(&data->update_lock);
|
|
status = as6712_32x_cpld_read_internal(client, reg);
|
|
if (unlikely(status < 0)) {
|
|
goto exit;
|
|
}
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return sprintf(buf, "%d\n", !(status & mask));
|
|
|
|
exit:
|
|
mutex_unlock(&data->update_lock);
|
|
return status;
|
|
}
|
|
|
|
static ssize_t access(struct device *dev, struct device_attribute *da,
|
|
const char *buf, size_t count)
|
|
{
|
|
int status;
|
|
u32 addr, val;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
|
|
struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
|
|
|
|
if (sscanf(buf, "0x%x 0x%x", &addr, &val) != 2) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (addr > 0xFF || val > 0xFF) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&data->update_lock);
|
|
status = as6712_32x_cpld_write_internal(client, addr, val);
|
|
if (unlikely(status < 0)) {
|
|
goto exit;
|
|
}
|
|
mutex_unlock(&data->update_lock);
|
|
return count;
|
|
|
|
exit:
|
|
mutex_unlock(&data->update_lock);
|
|
return status;
|
|
}
|
|
|
|
/* Write to mux register. Don't use i2c_transfer()/i2c_smbus_xfer()
|
|
for this as they will try to lock adapter a second time */
|
|
static int as6712_32x_cpld_mux_reg_write(struct i2c_adapter *adap,
|
|
struct i2c_client *client, u8 val)
|
|
{
|
|
unsigned long orig_jiffies;
|
|
unsigned short flags;
|
|
union i2c_smbus_data data;
|
|
int try;
|
|
s32 res = -EIO;
|
|
|
|
data.byte = val;
|
|
flags = client->flags;
|
|
flags &= I2C_M_TEN | I2C_CLIENT_PEC;
|
|
|
|
if (adap->algo->smbus_xfer) {
|
|
/* Retry automatically on arbitration loss */
|
|
orig_jiffies = jiffies;
|
|
for (res = 0, try = 0; try <= adap->retries; try++) {
|
|
res = adap->algo->smbus_xfer(adap, client->addr, flags,
|
|
I2C_SMBUS_WRITE, CPLD_CHANNEL_SELECT_REG,
|
|
I2C_SMBUS_BYTE_DATA, &data);
|
|
if (res != -EAGAIN)
|
|
break;
|
|
if (time_after(jiffies,
|
|
orig_jiffies + adap->timeout))
|
|
break;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int as6712_32x_cpld_mux_select_chan(struct i2c_mux_core *muxc,
|
|
u32 chan)
|
|
{
|
|
struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
|
|
struct i2c_client *client = data->client;
|
|
u8 regval;
|
|
int ret = 0;
|
|
regval = chan;
|
|
|
|
/* Only select the channel if its different from the last channel */
|
|
if (data->last_chan != regval) {
|
|
ret = as6712_32x_cpld_mux_reg_write(muxc->parent, client, regval);
|
|
data->last_chan = regval;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int as6712_32x_cpld_mux_deselect_mux(struct i2c_mux_core *muxc,
|
|
u32 chan)
|
|
{
|
|
struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
|
|
struct i2c_client *client = data->client;
|
|
|
|
/* Deselect active channel */
|
|
data->last_chan = chips[data->type].deselectChan;
|
|
|
|
return as6712_32x_cpld_mux_reg_write(muxc->parent, client, data->last_chan);
|
|
}
|
|
|
|
static void as6712_32x_cpld_add_client(struct i2c_client *client)
|
|
{
|
|
struct cpld_client_node *node = kzalloc(sizeof(struct cpld_client_node), GFP_KERNEL);
|
|
|
|
if (!node) {
|
|
dev_dbg(&client->dev, "Can't allocate cpld_client_node (0x%x)\n", client->addr);
|
|
return;
|
|
}
|
|
|
|
node->client = client;
|
|
|
|
mutex_lock(&list_lock);
|
|
list_add(&node->list, &cpld_client_list);
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
|
|
static void as6712_32x_cpld_remove_client(struct i2c_client *client)
|
|
{
|
|
struct list_head *list_node = NULL;
|
|
struct cpld_client_node *cpld_node = NULL;
|
|
int found = 0;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_for_each(list_node, &cpld_client_list)
|
|
{
|
|
cpld_node = list_entry(list_node, struct cpld_client_node, list);
|
|
|
|
if (cpld_node->client == client) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
list_del(list_node);
|
|
kfree(cpld_node);
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
|
|
static ssize_t show_version(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
int val = 0;
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
val = i2c_smbus_read_byte_data(client, 0x1);
|
|
|
|
if (val < 0) {
|
|
dev_dbg(&client->dev, "cpld(0x%x) reg(0x1) err %d\n", client->addr, val);
|
|
}
|
|
|
|
return sprintf(buf, "%d", val);
|
|
}
|
|
|
|
/*
|
|
* I2C init/probing/exit functions
|
|
*/
|
|
static int as6712_32x_cpld_mux_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
|
|
int force, class;
|
|
struct i2c_mux_core *muxc;
|
|
struct as6712_32x_cpld_data *data;
|
|
int chan = 0;
|
|
int ret = -ENODEV;
|
|
const struct attribute_group *group = NULL;
|
|
|
|
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE))
|
|
return -ENODEV;
|
|
|
|
muxc = i2c_mux_alloc(adap, &client->dev,
|
|
chips[id->driver_data].nchans,
|
|
sizeof(*data), 0,
|
|
as6712_32x_cpld_mux_select_chan,
|
|
as6712_32x_cpld_mux_deselect_mux);
|
|
if (!muxc)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, muxc);
|
|
data = i2c_mux_priv(muxc);
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
if (data->type == as6712_32x_cpld2 || data->type == as6712_32x_cpld3) {
|
|
data->type = id->driver_data;
|
|
data->last_chan = chips[data->type].deselectChan; /* force the first selection */
|
|
|
|
/* Now create an adapter for each channel */
|
|
for (chan = 0; chan < chips[data->type].nchans; chan++) {
|
|
force = 0; /* dynamic adap number */
|
|
class = 0; /* no class by default */
|
|
|
|
ret = i2c_mux_add_adapter(muxc, force, chan, class);
|
|
|
|
if (ret) {
|
|
ret = -ENODEV;
|
|
dev_err(&client->dev, "failed to register multiplexed adapter %d\n", chan);
|
|
goto exit_mux_register;
|
|
}
|
|
}
|
|
|
|
dev_info(&client->dev, "registered %d multiplexed busses for I2C mux %s\n",
|
|
chan, client->name);
|
|
}
|
|
|
|
/* Register sysfs hooks */
|
|
switch (data->type) {
|
|
case as6712_32x_cpld1:
|
|
group = &as6712_32x_cpld1_group;
|
|
break;
|
|
case as6712_32x_cpld2:
|
|
group = &as6712_32x_cpld2_group;
|
|
break;
|
|
case as6712_32x_cpld3:
|
|
group = &as6712_32x_cpld3_group;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (group) {
|
|
ret = sysfs_create_group(&client->dev.kobj, group);
|
|
if (ret) {
|
|
goto exit_mux_register;
|
|
}
|
|
}
|
|
|
|
if (chips[data->type].nchans) {
|
|
dev_info(&client->dev,
|
|
"registered %d multiplexed busses for I2C %s\n",
|
|
chan, client->name);
|
|
}
|
|
else {
|
|
dev_info(&client->dev,
|
|
"device %s registered\n", client->name);
|
|
}
|
|
|
|
as6712_32x_cpld_add_client(client);
|
|
|
|
return 0;
|
|
|
|
exit_mux_register:
|
|
i2c_mux_del_adapters(muxc);
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
static int as6712_32x_cpld_mux_remove(struct i2c_client *client)
|
|
{
|
|
struct i2c_mux_core *muxc = i2c_get_clientdata(client);
|
|
struct as6712_32x_cpld_data *data = i2c_mux_priv(muxc);
|
|
const struct attribute_group *group = NULL;
|
|
|
|
as6712_32x_cpld_remove_client(client);
|
|
|
|
/* Remove sysfs hooks */
|
|
switch (data->type) {
|
|
case as6712_32x_cpld1:
|
|
group = &as6712_32x_cpld1_group;
|
|
break;
|
|
case as6712_32x_cpld2:
|
|
group = &as6712_32x_cpld2_group;
|
|
break;
|
|
case as6712_32x_cpld3:
|
|
group = &as6712_32x_cpld3_group;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (group) {
|
|
sysfs_remove_group(&client->dev.kobj, group);
|
|
}
|
|
|
|
i2c_mux_del_adapters(muxc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int as6712_32x_cpld_read_internal(struct i2c_client *client, u8 reg)
|
|
{
|
|
int status = 0, retry = I2C_RW_RETRY_COUNT;
|
|
|
|
while (retry) {
|
|
status = i2c_smbus_read_byte_data(client, reg);
|
|
if (unlikely(status < 0)) {
|
|
msleep(I2C_RW_RETRY_INTERVAL);
|
|
retry--;
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
static int as6712_32x_cpld_write_internal(struct i2c_client *client, u8 reg, u8 value)
|
|
{
|
|
int status = 0, retry = I2C_RW_RETRY_COUNT;
|
|
|
|
while (retry) {
|
|
status = i2c_smbus_write_byte_data(client, reg, value);
|
|
if (unlikely(status < 0)) {
|
|
msleep(I2C_RW_RETRY_INTERVAL);
|
|
retry--;
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
int as6712_32x_cpld_read(unsigned short cpld_addr, u8 reg)
|
|
{
|
|
struct list_head *list_node = NULL;
|
|
struct cpld_client_node *cpld_node = NULL;
|
|
int ret = -EPERM;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_for_each(list_node, &cpld_client_list)
|
|
{
|
|
cpld_node = list_entry(list_node, struct cpld_client_node, list);
|
|
|
|
if (cpld_node->client->addr == cpld_addr) {
|
|
ret = as6712_32x_cpld_read_internal(cpld_node->client, reg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(as6712_32x_cpld_read);
|
|
|
|
int as6712_32x_cpld_write(unsigned short cpld_addr, u8 reg, u8 value)
|
|
{
|
|
struct list_head *list_node = NULL;
|
|
struct cpld_client_node *cpld_node = NULL;
|
|
int ret = -EIO;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_for_each(list_node, &cpld_client_list)
|
|
{
|
|
cpld_node = list_entry(list_node, struct cpld_client_node, list);
|
|
|
|
if (cpld_node->client->addr == cpld_addr) {
|
|
ret = as6712_32x_cpld_write_internal(cpld_node->client, reg, value);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(as6712_32x_cpld_write);
|
|
|
|
static struct i2c_driver as6712_32x_cpld_mux_driver = {
|
|
.driver = {
|
|
.name = "as6712_32x_cpld",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = as6712_32x_cpld_mux_probe,
|
|
.remove = as6712_32x_cpld_mux_remove,
|
|
.id_table = as6712_32x_cpld_mux_id,
|
|
};
|
|
|
|
static int __init as6712_32x_cpld_mux_init(void)
|
|
{
|
|
mutex_init(&list_lock);
|
|
return i2c_add_driver(&as6712_32x_cpld_mux_driver);
|
|
}
|
|
|
|
static void __exit as6712_32x_cpld_mux_exit(void)
|
|
{
|
|
i2c_del_driver(&as6712_32x_cpld_mux_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
|
|
MODULE_DESCRIPTION("Accton as6712-32x CPLD driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(as6712_32x_cpld_mux_init);
|
|
module_exit(as6712_32x_cpld_mux_exit);
|
|
|