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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 00:56:40 +07:00
55692af5eb
Currently the MFD core supports remapping MFD cell interrupts using an irqdomain but only if the MFD is being instantiated using device tree and only if the device tree bindings use the pattern of registering IPs in the device tree with compatible properties. This will be actively harmful for drivers which support non-DT platforms and use this pattern for their DT bindings as it will mean that the core will silently change remapping behaviour and it is also limiting for drivers which don't do DT with this particular pattern. There is also a potential fragility if there are interrupts not associated with MFD cells and all the cells are omitted from the device tree for some reason. Instead change the code to take an IRQ domain as an optional argument, allowing drivers to take the decision about the parent domain for their interrupts. The one current user of this feature is ab8500-core, it has the domain lookup pushed out into the driver. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
158 lines
3.2 KiB
C
158 lines
3.2 KiB
C
/*
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* tps6507x.c -- TPS6507x chip family multi-function driver
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*
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* Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
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*
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* Author: Todd Fischer
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* todd.fischer@ridgerun.com
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*
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* Credits:
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*
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* Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
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*
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* For licencing details see kernel-base/COPYING
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*
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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/slab.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps6507x.h>
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static struct mfd_cell tps6507x_devs[] = {
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{
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.name = "tps6507x-pmic",
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},
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{
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.name = "tps6507x-ts",
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},
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};
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static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
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int bytes, void *dest)
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{
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struct i2c_client *i2c = tps6507x->i2c_client;
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struct i2c_msg xfer[2];
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int ret;
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/* Write register */
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xfer[0].addr = i2c->addr;
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xfer[0].flags = 0;
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xfer[0].len = 1;
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xfer[0].buf = ®
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/* Read data */
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xfer[1].addr = i2c->addr;
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xfer[1].flags = I2C_M_RD;
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xfer[1].len = bytes;
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xfer[1].buf = dest;
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ret = i2c_transfer(i2c->adapter, xfer, 2);
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if (ret == 2)
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ret = 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 tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
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int bytes, void *src)
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{
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struct i2c_client *i2c = tps6507x->i2c_client;
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/* we add 1 byte for device register */
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u8 msg[TPS6507X_MAX_REGISTER + 1];
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int ret;
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if (bytes > TPS6507X_MAX_REGISTER)
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return -EINVAL;
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msg[0] = reg;
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memcpy(&msg[1], src, bytes);
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ret = i2c_master_send(i2c, msg, bytes + 1);
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if (ret < 0)
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return ret;
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if (ret != bytes + 1)
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return -EIO;
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return 0;
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}
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static int tps6507x_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct tps6507x_dev *tps6507x;
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int ret = 0;
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tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
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if (tps6507x == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, tps6507x);
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tps6507x->dev = &i2c->dev;
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tps6507x->i2c_client = i2c;
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tps6507x->read_dev = tps6507x_i2c_read_device;
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tps6507x->write_dev = tps6507x_i2c_write_device;
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ret = mfd_add_devices(tps6507x->dev, -1,
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tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
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NULL, 0, NULL);
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if (ret < 0)
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goto err;
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return ret;
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err:
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mfd_remove_devices(tps6507x->dev);
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kfree(tps6507x);
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return ret;
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}
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static int tps6507x_i2c_remove(struct i2c_client *i2c)
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{
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struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
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mfd_remove_devices(tps6507x->dev);
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kfree(tps6507x);
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return 0;
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}
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static const struct i2c_device_id tps6507x_i2c_id[] = {
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{ "tps6507x", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
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static struct i2c_driver tps6507x_i2c_driver = {
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.driver = {
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.name = "tps6507x",
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.owner = THIS_MODULE,
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},
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.probe = tps6507x_i2c_probe,
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.remove = tps6507x_i2c_remove,
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.id_table = tps6507x_i2c_id,
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};
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static int __init tps6507x_i2c_init(void)
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{
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return i2c_add_driver(&tps6507x_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(tps6507x_i2c_init);
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static void __exit tps6507x_i2c_exit(void)
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{
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i2c_del_driver(&tps6507x_i2c_driver);
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}
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module_exit(tps6507x_i2c_exit);
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MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
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MODULE_LICENSE("GPL");
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