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3fc87cb94f
The KSZ DSA driver starts a timer to read MIB counters periodically to avoid count overrun. During system suspend this will give an error for not able to write to register as the SPI system returns an error when it is in suspend state. This implementation stops the timer when the system goes into suspend and restarts it when resumed. Signed-off-by: Tristram Ha <tristram.ha@microchip.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20241218020311.70628-1-Tristram.Ha@microchip.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Microchip KSZ9477 series register access through I2C
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*
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* Copyright (C) 2018-2024 Microchip Technology Inc.
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*/
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include "ksz_common.h"
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KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0);
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static int ksz9477_i2c_probe(struct i2c_client *i2c)
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{
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const struct ksz_chip_data *chip;
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struct device *ddev = &i2c->dev;
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struct regmap_config rc;
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struct ksz_device *dev;
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int i, ret;
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dev = ksz_switch_alloc(&i2c->dev, i2c);
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if (!dev)
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return -ENOMEM;
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chip = device_get_match_data(ddev);
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if (!chip)
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return -EINVAL;
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/* Save chip id to do special initialization when probing. */
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dev->chip_id = chip->chip_id;
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for (i = 0; i < __KSZ_NUM_REGMAPS; i++) {
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rc = ksz9477_regmap_config[i];
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rc.lock_arg = &dev->regmap_mutex;
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dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
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if (IS_ERR(dev->regmap[i])) {
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return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]),
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"Failed to initialize regmap%i\n",
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ksz9477_regmap_config[i].val_bits);
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}
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}
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if (i2c->dev.platform_data)
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dev->pdata = i2c->dev.platform_data;
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dev->irq = i2c->irq;
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ret = ksz_switch_register(dev);
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/* Main DSA driver may not be started yet. */
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if (ret)
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return ret;
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i2c_set_clientdata(i2c, dev);
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return 0;
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}
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static void ksz9477_i2c_remove(struct i2c_client *i2c)
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{
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struct ksz_device *dev = i2c_get_clientdata(i2c);
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if (dev)
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ksz_switch_remove(dev);
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}
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static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
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{
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struct ksz_device *dev = i2c_get_clientdata(i2c);
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if (!dev)
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return;
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ksz_switch_shutdown(dev);
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i2c_set_clientdata(i2c, NULL);
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}
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static const struct i2c_device_id ksz9477_i2c_id[] = {
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{ "ksz9477-switch" },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
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static const struct of_device_id ksz9477_dt_ids[] = {
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{
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.compatible = "microchip,ksz9477",
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.data = &ksz_switch_chips[KSZ9477]
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},
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{
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.compatible = "microchip,ksz9896",
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.data = &ksz_switch_chips[KSZ9896]
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},
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{
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.compatible = "microchip,ksz9897",
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.data = &ksz_switch_chips[KSZ9897]
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},
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{
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.compatible = "microchip,ksz9893",
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.data = &ksz_switch_chips[KSZ9893]
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},
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{
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.compatible = "microchip,ksz9563",
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.data = &ksz_switch_chips[KSZ9563]
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},
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{
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.compatible = "microchip,ksz8563",
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.data = &ksz_switch_chips[KSZ8563]
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},
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{
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.compatible = "microchip,ksz8567",
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.data = &ksz_switch_chips[KSZ8567]
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},
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{
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.compatible = "microchip,ksz9567",
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.data = &ksz_switch_chips[KSZ9567]
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},
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{
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.compatible = "microchip,lan9646",
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.data = &ksz_switch_chips[LAN9646]
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
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static DEFINE_SIMPLE_DEV_PM_OPS(ksz_i2c_pm_ops,
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ksz_switch_suspend, ksz_switch_resume);
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static struct i2c_driver ksz9477_i2c_driver = {
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.driver = {
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.name = "ksz9477-switch",
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.of_match_table = ksz9477_dt_ids,
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.pm = &ksz_i2c_pm_ops,
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},
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.probe = ksz9477_i2c_probe,
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.remove = ksz9477_i2c_remove,
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.shutdown = ksz9477_i2c_shutdown,
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.id_table = ksz9477_i2c_id,
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};
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module_i2c_driver(ksz9477_i2c_driver);
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MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
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MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
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MODULE_LICENSE("GPL v2");
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