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9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/dmi.h>
13#include <linux/pci.h>
14#include <linux/cec.h>
15#include <linux/slab.h>
16#include <linux/interrupt.h>
17#include <linux/platform_data/cros_ec_commands.h>
18#include <linux/platform_data/cros_ec_proto.h>
19#include <media/cec.h>
20#include <media/cec-notifier.h>
21
22#define DRV_NAME "cros-ec-cec"
23
24
25
26
27
28
29
30
31
32
33struct cros_ec_cec {
34 struct cros_ec_device *cros_ec;
35 struct notifier_block notifier;
36 struct cec_adapter *adap;
37 struct cec_notifier *notify;
38 struct cec_msg rx_msg;
39};
40
41static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
42{
43 struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
44 uint8_t *cec_message = cros_ec->event_data.data.cec_message;
45 unsigned int len = cros_ec->event_size;
46
47 cros_ec_cec->rx_msg.len = len;
48 memcpy(cros_ec_cec->rx_msg.msg, cec_message, len);
49
50 cec_received_msg(cros_ec_cec->adap, &cros_ec_cec->rx_msg);
51}
52
53static void handle_cec_event(struct cros_ec_cec *cros_ec_cec)
54{
55 struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
56 uint32_t events = cros_ec->event_data.data.cec_events;
57
58 if (events & EC_MKBP_CEC_SEND_OK)
59 cec_transmit_attempt_done(cros_ec_cec->adap,
60 CEC_TX_STATUS_OK);
61
62
63 if (events & EC_MKBP_CEC_SEND_FAILED)
64 cec_transmit_attempt_done(cros_ec_cec->adap,
65 CEC_TX_STATUS_MAX_RETRIES |
66 CEC_TX_STATUS_NACK);
67}
68
69static int cros_ec_cec_event(struct notifier_block *nb,
70 unsigned long queued_during_suspend,
71 void *_notify)
72{
73 struct cros_ec_cec *cros_ec_cec;
74 struct cros_ec_device *cros_ec;
75
76 cros_ec_cec = container_of(nb, struct cros_ec_cec, notifier);
77 cros_ec = cros_ec_cec->cros_ec;
78
79 if (cros_ec->event_data.event_type == EC_MKBP_EVENT_CEC_EVENT) {
80 handle_cec_event(cros_ec_cec);
81 return NOTIFY_OK;
82 }
83
84 if (cros_ec->event_data.event_type == EC_MKBP_EVENT_CEC_MESSAGE) {
85 handle_cec_message(cros_ec_cec);
86 return NOTIFY_OK;
87 }
88
89 return NOTIFY_DONE;
90}
91
92static int cros_ec_cec_set_log_addr(struct cec_adapter *adap, u8 logical_addr)
93{
94 struct cros_ec_cec *cros_ec_cec = adap->priv;
95 struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
96 struct {
97 struct cros_ec_command msg;
98 struct ec_params_cec_set data;
99 } __packed msg = {};
100 int ret;
101
102 msg.msg.command = EC_CMD_CEC_SET;
103 msg.msg.outsize = sizeof(msg.data);
104 msg.data.cmd = CEC_CMD_LOGICAL_ADDRESS;
105 msg.data.val = logical_addr;
106
107 ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
108 if (ret < 0) {
109 dev_err(cros_ec->dev,
110 "error setting CEC logical address on EC: %d\n", ret);
111 return ret;
112 }
113
114 return 0;
115}
116
117static int cros_ec_cec_transmit(struct cec_adapter *adap, u8 attempts,
118 u32 signal_free_time, struct cec_msg *cec_msg)
119{
120 struct cros_ec_cec *cros_ec_cec = adap->priv;
121 struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
122 struct {
123 struct cros_ec_command msg;
124 struct ec_params_cec_write data;
125 } __packed msg = {};
126 int ret;
127
128 msg.msg.command = EC_CMD_CEC_WRITE_MSG;
129 msg.msg.outsize = cec_msg->len;
130 memcpy(msg.data.msg, cec_msg->msg, cec_msg->len);
131
132 ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
133 if (ret < 0) {
134 dev_err(cros_ec->dev,
135 "error writing CEC msg on EC: %d\n", ret);
136 return ret;
137 }
138
139 return 0;
140}
141
142static int cros_ec_cec_adap_enable(struct cec_adapter *adap, bool enable)
143{
144 struct cros_ec_cec *cros_ec_cec = adap->priv;
145 struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
146 struct {
147 struct cros_ec_command msg;
148 struct ec_params_cec_set data;
149 } __packed msg = {};
150 int ret;
151
152 msg.msg.command = EC_CMD_CEC_SET;
153 msg.msg.outsize = sizeof(msg.data);
154 msg.data.cmd = CEC_CMD_ENABLE;
155 msg.data.val = enable;
156
157 ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
158 if (ret < 0) {
159 dev_err(cros_ec->dev,
160 "error %sabling CEC on EC: %d\n",
161 (enable ? "en" : "dis"), ret);
162 return ret;
163 }
164
165 return 0;
166}
167
168static const struct cec_adap_ops cros_ec_cec_ops = {
169 .adap_enable = cros_ec_cec_adap_enable,
170 .adap_log_addr = cros_ec_cec_set_log_addr,
171 .adap_transmit = cros_ec_cec_transmit,
172};
173
174#ifdef CONFIG_PM_SLEEP
175static int cros_ec_cec_suspend(struct device *dev)
176{
177 struct platform_device *pdev = to_platform_device(dev);
178 struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
179
180 if (device_may_wakeup(dev))
181 enable_irq_wake(cros_ec_cec->cros_ec->irq);
182
183 return 0;
184}
185
186static int cros_ec_cec_resume(struct device *dev)
187{
188 struct platform_device *pdev = to_platform_device(dev);
189 struct cros_ec_cec *cros_ec_cec = dev_get_drvdata(&pdev->dev);
190
191 if (device_may_wakeup(dev))
192 disable_irq_wake(cros_ec_cec->cros_ec->irq);
193
194 return 0;
195}
196#endif
197
198static SIMPLE_DEV_PM_OPS(cros_ec_cec_pm_ops,
199 cros_ec_cec_suspend, cros_ec_cec_resume);
200
201#if IS_ENABLED(CONFIG_PCI) && IS_ENABLED(CONFIG_DMI)
202
203
204
205
206
207
208struct cec_dmi_match {
209 const char *sys_vendor;
210 const char *product_name;
211 const char *devname;
212 const char *conn;
213};
214
215static const struct cec_dmi_match cec_dmi_match_table[] = {
216
217 { "Google", "Fizz", "0000:00:02.0", "Port B" },
218
219 { "Google", "Brask", "0000:00:02.0", "Port B" },
220};
221
222static struct device *cros_ec_cec_find_hdmi_dev(struct device *dev,
223 const char **conn)
224{
225 int i;
226
227 for (i = 0 ; i < ARRAY_SIZE(cec_dmi_match_table) ; ++i) {
228 const struct cec_dmi_match *m = &cec_dmi_match_table[i];
229
230 if (dmi_match(DMI_SYS_VENDOR, m->sys_vendor) &&
231 dmi_match(DMI_PRODUCT_NAME, m->product_name)) {
232 struct device *d;
233
234
235 d = bus_find_device_by_name(&pci_bus_type, NULL,
236 m->devname);
237 if (!d)
238 return ERR_PTR(-EPROBE_DEFER);
239 put_device(d);
240 *conn = m->conn;
241 return d;
242 }
243 }
244
245
246 dev_warn(dev, "CEC notifier not configured for this hardware\n");
247
248 return ERR_PTR(-ENODEV);
249}
250
251#else
252
253static struct device *cros_ec_cec_find_hdmi_dev(struct device *dev,
254 const char **conn)
255{
256 return ERR_PTR(-ENODEV);
257}
258
259#endif
260
261static int cros_ec_cec_probe(struct platform_device *pdev)
262{
263 struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
264 struct cros_ec_device *cros_ec = ec_dev->ec_dev;
265 struct cros_ec_cec *cros_ec_cec;
266 struct device *hdmi_dev;
267 const char *conn = NULL;
268 int ret;
269
270 hdmi_dev = cros_ec_cec_find_hdmi_dev(&pdev->dev, &conn);
271 if (IS_ERR(hdmi_dev))
272 return PTR_ERR(hdmi_dev);
273
274 cros_ec_cec = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_cec),
275 GFP_KERNEL);
276 if (!cros_ec_cec)
277 return -ENOMEM;
278
279 platform_set_drvdata(pdev, cros_ec_cec);
280 cros_ec_cec->cros_ec = cros_ec;
281
282 device_init_wakeup(&pdev->dev, 1);
283
284 cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
285 DRV_NAME,
286 CEC_CAP_DEFAULTS |
287 CEC_CAP_CONNECTOR_INFO, 1);
288 if (IS_ERR(cros_ec_cec->adap))
289 return PTR_ERR(cros_ec_cec->adap);
290
291 cros_ec_cec->notify = cec_notifier_cec_adap_register(hdmi_dev, conn,
292 cros_ec_cec->adap);
293 if (!cros_ec_cec->notify) {
294 ret = -ENOMEM;
295 goto out_probe_adapter;
296 }
297
298
299 cros_ec_cec->notifier.notifier_call = cros_ec_cec_event;
300 ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
301 &cros_ec_cec->notifier);
302 if (ret) {
303 dev_err(&pdev->dev, "failed to register notifier\n");
304 goto out_probe_notify;
305 }
306
307 ret = cec_register_adapter(cros_ec_cec->adap, &pdev->dev);
308 if (ret < 0)
309 goto out_probe_notify;
310
311 return 0;
312
313out_probe_notify:
314 cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
315 cros_ec_cec->adap);
316out_probe_adapter:
317 cec_delete_adapter(cros_ec_cec->adap);
318 return ret;
319}
320
321static int cros_ec_cec_remove(struct platform_device *pdev)
322{
323 struct cros_ec_cec *cros_ec_cec = platform_get_drvdata(pdev);
324 struct device *dev = &pdev->dev;
325 int ret;
326
327 ret = blocking_notifier_chain_unregister(
328 &cros_ec_cec->cros_ec->event_notifier,
329 &cros_ec_cec->notifier);
330
331 if (ret) {
332 dev_err(dev, "failed to unregister notifier\n");
333 return ret;
334 }
335
336 cec_notifier_cec_adap_unregister(cros_ec_cec->notify,
337 cros_ec_cec->adap);
338 cec_unregister_adapter(cros_ec_cec->adap);
339
340 return 0;
341}
342
343static struct platform_driver cros_ec_cec_driver = {
344 .probe = cros_ec_cec_probe,
345 .remove = cros_ec_cec_remove,
346 .driver = {
347 .name = DRV_NAME,
348 .pm = &cros_ec_cec_pm_ops,
349 },
350};
351
352module_platform_driver(cros_ec_cec_driver);
353
354MODULE_DESCRIPTION("CEC driver for ChromeOS ECs");
355MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
356MODULE_LICENSE("GPL");
357MODULE_ALIAS("platform:" DRV_NAME);
358
