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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2021, Intel Corporation. All rights reserved. | |
4 | * Intel Management Engine Interface (Intel MEI) Linux driver | |
5 | */ | |
6 | #include <linux/acpi.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/gpio.h> | |
9 | #include <linux/interrupt.h> | |
10 | #include <linux/irq.h> | |
11 | #include <linux/mei.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/pm_runtime.h> | |
14 | #include <linux/spi/spi.h> | |
15 | ||
16 | #include "client.h" | |
17 | #include "hw-vsc.h" | |
18 | #include "mei_dev.h" | |
19 | ||
20 | /* gpio resources*/ | |
21 | static const struct acpi_gpio_params wakeuphost_gpio = { 0, 0, false }; | |
22 | static const struct acpi_gpio_params wakeuphostint_gpio = { 1, 0, false }; | |
23 | static const struct acpi_gpio_params resetfw_gpio = { 2, 0, false }; | |
24 | static const struct acpi_gpio_params wakeupfw = { 3, 0, false }; | |
25 | static const struct acpi_gpio_mapping mei_vsc_acpi_gpios[] = { | |
26 | { "wakeuphost-gpios", &wakeuphost_gpio, 1 }, | |
27 | { "wakeuphostint-gpios", &wakeuphostint_gpio, 1 }, | |
28 | { "resetfw-gpios", &resetfw_gpio, 1 }, | |
29 | { "wakeupfw-gpios", &wakeupfw, 1 }, | |
30 | {} | |
31 | }; | |
32 | ||
33 | static int mei_vsc_probe(struct spi_device *spi) | |
34 | { | |
35 | struct mei_vsc_hw *hw; | |
36 | struct mei_device *dev; | |
37 | int ret; | |
38 | ||
39 | dev = mei_vsc_dev_init(&spi->dev); | |
40 | if (!dev) | |
41 | return -ENOMEM; | |
42 | ||
43 | hw = to_vsc_hw(dev); | |
44 | mutex_init(&hw->mutex); | |
45 | init_waitqueue_head(&hw->xfer_wait); | |
46 | hw->spi = spi; | |
47 | spi_set_drvdata(spi, dev); | |
48 | ||
49 | ret = devm_acpi_dev_add_driver_gpios(&spi->dev, mei_vsc_acpi_gpios); | |
50 | if (ret) { | |
51 | dev_err(&spi->dev, "%s: fail to add gpio\n", __func__); | |
52 | return -EBUSY; | |
53 | } | |
54 | ||
55 | hw->wakeuphost = devm_gpiod_get(&spi->dev, "wakeuphost", GPIOD_IN); | |
56 | if (IS_ERR(hw->wakeuphost)) { | |
57 | dev_err(&spi->dev, "gpio get irq failed\n"); | |
58 | return -EINVAL; | |
59 | } | |
60 | hw->resetfw = devm_gpiod_get(&spi->dev, "resetfw", GPIOD_OUT_HIGH); | |
61 | if (IS_ERR(hw->resetfw)) { | |
62 | dev_err(&spi->dev, "gpio get resetfw failed\n"); | |
63 | return -EINVAL; | |
64 | } | |
65 | hw->wakeupfw = devm_gpiod_get(&spi->dev, "wakeupfw", GPIOD_OUT_HIGH); | |
66 | if (IS_ERR(hw->wakeupfw)) { | |
67 | dev_err(&spi->dev, "gpio get wakeupfw failed\n"); | |
68 | return -EINVAL; | |
69 | } | |
70 | ||
71 | ret = acpi_dev_gpio_irq_get_by(ACPI_COMPANION(&spi->dev), | |
72 | "wakeuphostint-gpios", 0); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
76 | hw->wakeuphostint = ret; | |
77 | irq_set_status_flags(hw->wakeuphostint, IRQ_DISABLE_UNLAZY); | |
78 | ret = request_threaded_irq(hw->wakeuphostint, mei_vsc_irq_quick_handler, | |
79 | mei_vsc_irq_thread_handler, | |
80 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
81 | KBUILD_MODNAME, dev); | |
82 | if (mei_start(dev)) { | |
83 | dev_err(&spi->dev, "init hw failure.\n"); | |
84 | ret = -ENODEV; | |
85 | goto release_irq; | |
86 | } | |
87 | ||
88 | ret = mei_register(dev, &spi->dev); | |
89 | if (ret) | |
90 | goto stop; | |
91 | ||
92 | pm_runtime_enable(dev->dev); | |
93 | dev_dbg(&spi->dev, "initialization successful.\n"); | |
94 | return 0; | |
95 | ||
96 | stop: | |
97 | mei_stop(dev); | |
98 | release_irq: | |
99 | mei_cancel_work(dev); | |
100 | mei_disable_interrupts(dev); | |
101 | free_irq(hw->wakeuphostint, dev); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | static int __maybe_unused mei_vsc_suspend(struct device *device) | |
106 | { | |
107 | struct spi_device *spi = to_spi_device(device); | |
108 | struct mei_device *dev = spi_get_drvdata(spi); | |
109 | struct mei_vsc_hw *hw = to_vsc_hw(dev); | |
110 | ||
111 | if (!dev) | |
112 | return -ENODEV; | |
113 | ||
114 | dev_dbg(dev->dev, "%s\n", __func__); | |
115 | ||
116 | hw->disconnect = true; | |
117 | mei_stop(dev); | |
118 | mei_disable_interrupts(dev); | |
119 | free_irq(hw->wakeuphostint, dev); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static int __maybe_unused mei_vsc_resume(struct device *device) | |
124 | { | |
125 | struct spi_device *spi = to_spi_device(device); | |
126 | struct mei_device *dev = spi_get_drvdata(spi); | |
127 | struct mei_vsc_hw *hw = to_vsc_hw(dev); | |
128 | int ret; | |
129 | ||
130 | dev_dbg(dev->dev, "%s\n", __func__); | |
131 | irq_set_status_flags(hw->wakeuphostint, IRQ_DISABLE_UNLAZY); | |
132 | ret = request_threaded_irq(hw->wakeuphostint, mei_vsc_irq_quick_handler, | |
133 | mei_vsc_irq_thread_handler, | |
134 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
135 | KBUILD_MODNAME, dev); | |
136 | if (ret) { | |
137 | dev_err(device, "request_threaded_irq failed: irq = %d.\n", | |
138 | hw->wakeuphostint); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | hw->disconnect = false; | |
143 | ret = mei_restart(dev); | |
144 | if (ret) | |
145 | return ret; | |
146 | ||
147 | /* Start timer if stopped in suspend */ | |
148 | schedule_delayed_work(&dev->timer_work, HZ); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int mei_vsc_remove(struct spi_device *spi) | |
153 | { | |
154 | struct mei_device *dev = spi_get_drvdata(spi); | |
155 | struct mei_vsc_hw *hw = to_vsc_hw(dev); | |
156 | ||
157 | dev_info(&spi->dev, "%s %d", __func__, hw->wakeuphostint); | |
158 | ||
159 | pm_runtime_disable(dev->dev); | |
160 | hw->disconnect = true; | |
161 | mei_stop(dev); | |
162 | mei_disable_interrupts(dev); | |
163 | free_irq(hw->wakeuphostint, dev); | |
164 | mei_deregister(dev); | |
165 | mutex_destroy(&hw->mutex); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | /** | |
170 | * mei_vsc_shutdown - Device Removal Routine | |
171 | * | |
172 | * @spi: SPI device structure | |
173 | * | |
174 | * mei_vsc_shutdown is called from the reboot notifier | |
175 | * it's a simplified version of remove so we go down | |
176 | * faster. | |
177 | */ | |
178 | static void mei_vsc_shutdown(struct spi_device *spi) | |
179 | { | |
180 | struct mei_device *dev = spi_get_drvdata(spi); | |
181 | struct mei_vsc_hw *hw = to_vsc_hw(dev); | |
182 | ||
183 | dev_dbg(dev->dev, "shutdown\n"); | |
184 | hw->disconnect = true; | |
185 | mei_stop(dev); | |
186 | ||
187 | mei_disable_interrupts(dev); | |
188 | free_irq(hw->wakeuphostint, dev); | |
189 | } | |
190 | ||
191 | static const struct dev_pm_ops mei_vsc_pm_ops = { | |
192 | ||
193 | SET_SYSTEM_SLEEP_PM_OPS(mei_vsc_suspend, mei_vsc_resume) | |
194 | }; | |
195 | ||
196 | static const struct acpi_device_id mei_vsc_acpi_ids[] = { | |
197 | { "INTC1058", 1 }, | |
abcd3530 | 198 | { "INTC1094", 1 }, |
8857f00d WW |
199 | {}, |
200 | }; | |
201 | MODULE_DEVICE_TABLE(acpi, mei_vsc_acpi_ids); | |
202 | ||
203 | static struct spi_driver mei_vsc_driver = { | |
204 | .driver = { | |
205 | .name = KBUILD_MODNAME, | |
206 | .acpi_match_table = ACPI_PTR(mei_vsc_acpi_ids), | |
207 | .pm = &mei_vsc_pm_ops, | |
208 | }, | |
209 | .probe = mei_vsc_probe, | |
210 | .remove = mei_vsc_remove, | |
211 | .shutdown = mei_vsc_shutdown, | |
212 | .driver.probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
213 | }; | |
214 | module_spi_driver(mei_vsc_driver); | |
215 | ||
216 | MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>"); | |
217 | MODULE_DESCRIPTION("Intel MEI VSC driver"); | |
218 | MODULE_LICENSE("GPL v2"); |