1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2022 Microchip Technology Inc.
3
4#include <linux/mfd/core.h>
5#include <linux/module.h>
6#include <linux/pci.h>
7#include <linux/spinlock.h>
8#include <linux/gpio/driver.h>
9#include <linux/interrupt.h>
10#include <linux/io.h>
11#include <linux/idr.h>
12#include "mchp_pci1xxxx_gp.h"
13
14struct aux_bus_device {
15	struct auxiliary_device_wrapper *aux_device_wrapper[2];
16};
17
18static DEFINE_IDA(gp_client_ida);
19static const char aux_dev_otp_e2p_name[15] = "gp_otp_e2p";
20static const char aux_dev_gpio_name[15] = "gp_gpio";
21
22static void gp_auxiliary_device_release(struct device *dev)
23{
24	struct auxiliary_device_wrapper *aux_device_wrapper =
25		(struct auxiliary_device_wrapper *)container_of(dev,
26				struct auxiliary_device_wrapper, aux_dev.dev);
27
28	ida_free(&gp_client_ida, aux_device_wrapper->aux_dev.id);
29	kfree(aux_device_wrapper);
30}
31
32static int gp_aux_bus_probe(struct pci_dev *pdev, const struct pci_device_id *id)
33{
34	struct aux_bus_device *aux_bus;
35	int retval;
36
37	retval = pcim_enable_device(pdev);
38	if (retval)
39		return retval;
40
41	aux_bus = devm_kzalloc(&pdev->dev, sizeof(*aux_bus), GFP_KERNEL);
42	if (!aux_bus)
43		return -ENOMEM;
44
45	aux_bus->aux_device_wrapper[0] = kzalloc(sizeof(*aux_bus->aux_device_wrapper[0]),
46						 GFP_KERNEL);
47	if (!aux_bus->aux_device_wrapper[0])
48		return -ENOMEM;
49
50	retval = ida_alloc(&gp_client_ida, GFP_KERNEL);
51	if (retval < 0)
52		goto err_ida_alloc_0;
53
54	aux_bus->aux_device_wrapper[0]->aux_dev.name = aux_dev_otp_e2p_name;
55	aux_bus->aux_device_wrapper[0]->aux_dev.dev.parent = &pdev->dev;
56	aux_bus->aux_device_wrapper[0]->aux_dev.dev.release = gp_auxiliary_device_release;
57	aux_bus->aux_device_wrapper[0]->aux_dev.id = retval;
58
59	aux_bus->aux_device_wrapper[0]->gp_aux_data.region_start = pci_resource_start(pdev, 0);
60	aux_bus->aux_device_wrapper[0]->gp_aux_data.region_length = pci_resource_end(pdev, 0);
61
62	retval = auxiliary_device_init(&aux_bus->aux_device_wrapper[0]->aux_dev);
63	if (retval < 0)
64		goto err_aux_dev_init_0;
65
66	retval = auxiliary_device_add(&aux_bus->aux_device_wrapper[0]->aux_dev);
67	if (retval)
68		goto err_aux_dev_add_0;
69
70	aux_bus->aux_device_wrapper[1] = kzalloc(sizeof(*aux_bus->aux_device_wrapper[1]),
71						 GFP_KERNEL);
72	if (!aux_bus->aux_device_wrapper[1])
73		return -ENOMEM;
74
75	retval = ida_alloc(&gp_client_ida, GFP_KERNEL);
76	if (retval < 0)
77		goto err_ida_alloc_1;
78
79	aux_bus->aux_device_wrapper[1]->aux_dev.name = aux_dev_gpio_name;
80	aux_bus->aux_device_wrapper[1]->aux_dev.dev.parent = &pdev->dev;
81	aux_bus->aux_device_wrapper[1]->aux_dev.dev.release = gp_auxiliary_device_release;
82	aux_bus->aux_device_wrapper[1]->aux_dev.id = retval;
83
84	aux_bus->aux_device_wrapper[1]->gp_aux_data.region_start = pci_resource_start(pdev, 0);
85	aux_bus->aux_device_wrapper[1]->gp_aux_data.region_length = pci_resource_end(pdev, 0);
86
87	retval = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
88
89	if (retval < 0)
90		goto err_aux_dev_init_1;
91
92	retval = pci_irq_vector(pdev, 0);
93	if (retval < 0)
94		goto err_aux_dev_init_1;
95
96	pdev->irq = retval;
97	aux_bus->aux_device_wrapper[1]->gp_aux_data.irq_num = pdev->irq;
98
99	retval = auxiliary_device_init(&aux_bus->aux_device_wrapper[1]->aux_dev);
100	if (retval < 0)
101		goto err_aux_dev_init_1;
102
103	retval = auxiliary_device_add(&aux_bus->aux_device_wrapper[1]->aux_dev);
104	if (retval)
105		goto err_aux_dev_add_1;
106
107	pci_set_drvdata(pdev, aux_bus);
108	pci_set_master(pdev);
109
110	return 0;
111
112err_aux_dev_add_1:
113	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[1]->aux_dev);
114
115err_aux_dev_init_1:
116	ida_free(&gp_client_ida, aux_bus->aux_device_wrapper[1]->aux_dev.id);
117
118err_ida_alloc_1:
119	kfree(aux_bus->aux_device_wrapper[1]);
120
121err_aux_dev_add_0:
122	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[0]->aux_dev);
123
124err_aux_dev_init_0:
125	ida_free(&gp_client_ida, aux_bus->aux_device_wrapper[0]->aux_dev.id);
126
127err_ida_alloc_0:
128	kfree(aux_bus->aux_device_wrapper[0]);
129
130	return retval;
131}
132
133static void gp_aux_bus_remove(struct pci_dev *pdev)
134{
135	struct aux_bus_device *aux_bus = pci_get_drvdata(pdev);
136
137	auxiliary_device_delete(&aux_bus->aux_device_wrapper[0]->aux_dev);
138	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[0]->aux_dev);
139	auxiliary_device_delete(&aux_bus->aux_device_wrapper[1]->aux_dev);
140	auxiliary_device_uninit(&aux_bus->aux_device_wrapper[1]->aux_dev);
141}
142
143static const struct pci_device_id pci1xxxx_tbl[] = {
144	{ PCI_DEVICE(0x1055, 0xA005) },
145	{ PCI_DEVICE(0x1055, 0xA015) },
146	{ PCI_DEVICE(0x1055, 0xA025) },
147	{ PCI_DEVICE(0x1055, 0xA035) },
148	{ PCI_DEVICE(0x1055, 0xA045) },
149	{ PCI_DEVICE(0x1055, 0xA055) },
150	{0,}
151};
152MODULE_DEVICE_TABLE(pci, pci1xxxx_tbl);
153
154static struct pci_driver pci1xxxx_gp_driver = {
155	.name = "PCI1xxxxGP",
156	.id_table = pci1xxxx_tbl,
157	.probe = gp_aux_bus_probe,
158	.remove = gp_aux_bus_remove,
159};
160
161module_pci_driver(pci1xxxx_gp_driver);
162
163MODULE_DESCRIPTION("Microchip Technology Inc. PCI1xxxx GP expander");
164MODULE_AUTHOR("Kumaravel Thiagarajan <kumaravel.thiagarajan@microchip.com>");
165MODULE_LICENSE("GPL");
166