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12#include <linux/clk.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/mfd/syscon.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/of_platform.h>
19#include <linux/platform_device.h>
20#include <linux/pm_runtime.h>
21#include <linux/timer.h>
22#include <linux/workqueue.h>
23#include <media/cec.h>
24#include <media/cec-notifier.h>
25
26#include "exynos_hdmi_cec.h"
27#include "regs-cec.h"
28#include "s5p_cec.h"
29
30#define CEC_NAME "s5p-cec"
31
32static int debug;
33module_param(debug, int, 0644);
34MODULE_PARM_DESC(debug, "debug level (0-2)");
35
36static int s5p_cec_adap_enable(struct cec_adapter *adap, bool enable)
37{
38 int ret;
39 struct s5p_cec_dev *cec = cec_get_drvdata(adap);
40
41 if (enable) {
42 ret = pm_runtime_resume_and_get(cec->dev);
43 if (ret < 0)
44 return ret;
45
46 s5p_cec_reset(cec);
47
48 s5p_cec_set_divider(cec);
49 s5p_cec_threshold(cec);
50
51 s5p_cec_unmask_tx_interrupts(cec);
52 s5p_cec_unmask_rx_interrupts(cec);
53 s5p_cec_enable_rx(cec);
54 } else {
55 s5p_cec_mask_tx_interrupts(cec);
56 s5p_cec_mask_rx_interrupts(cec);
57 pm_runtime_put(cec->dev);
58 }
59
60 return 0;
61}
62
63static int s5p_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
64{
65 struct s5p_cec_dev *cec = cec_get_drvdata(adap);
66
67 s5p_cec_set_addr(cec, addr);
68 return 0;
69}
70
71static int s5p_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
72 u32 signal_free_time, struct cec_msg *msg)
73{
74 struct s5p_cec_dev *cec = cec_get_drvdata(adap);
75
76
77
78
79
80 s5p_cec_copy_packet(cec, msg->msg, msg->len, max(1, attempts - 1));
81 return 0;
82}
83
84static irqreturn_t s5p_cec_irq_handler(int irq, void *priv)
85{
86 struct s5p_cec_dev *cec = priv;
87 u32 status = 0;
88
89 status = s5p_cec_get_status(cec);
90
91 dev_dbg(cec->dev, "irq received\n");
92
93 if (status & CEC_STATUS_TX_DONE) {
94 if (status & CEC_STATUS_TX_NACK) {
95 dev_dbg(cec->dev, "CEC_STATUS_TX_NACK set\n");
96 cec->tx = STATE_NACK;
97 } else if (status & CEC_STATUS_TX_ERROR) {
98 dev_dbg(cec->dev, "CEC_STATUS_TX_ERROR set\n");
99 cec->tx = STATE_ERROR;
100 } else {
101 dev_dbg(cec->dev, "CEC_STATUS_TX_DONE\n");
102 cec->tx = STATE_DONE;
103 }
104 s5p_clr_pending_tx(cec);
105 }
106
107 if (status & CEC_STATUS_RX_DONE) {
108 if (status & CEC_STATUS_RX_ERROR) {
109 dev_dbg(cec->dev, "CEC_STATUS_RX_ERROR set\n");
110 s5p_cec_rx_reset(cec);
111 s5p_cec_enable_rx(cec);
112 } else {
113 dev_dbg(cec->dev, "CEC_STATUS_RX_DONE set\n");
114 if (cec->rx != STATE_IDLE)
115 dev_dbg(cec->dev, "Buffer overrun (worker did not process previous message)\n");
116 cec->rx = STATE_BUSY;
117 cec->msg.len = status >> 24;
118 cec->msg.rx_status = CEC_RX_STATUS_OK;
119 s5p_cec_get_rx_buf(cec, cec->msg.len,
120 cec->msg.msg);
121 cec->rx = STATE_DONE;
122 s5p_cec_enable_rx(cec);
123 }
124
125 s5p_clr_pending_rx(cec);
126 }
127 return IRQ_WAKE_THREAD;
128}
129
130static irqreturn_t s5p_cec_irq_handler_thread(int irq, void *priv)
131{
132 struct s5p_cec_dev *cec = priv;
133
134 dev_dbg(cec->dev, "irq processing thread\n");
135 switch (cec->tx) {
136 case STATE_DONE:
137 cec_transmit_done(cec->adap, CEC_TX_STATUS_OK, 0, 0, 0, 0);
138 cec->tx = STATE_IDLE;
139 break;
140 case STATE_NACK:
141 cec_transmit_done(cec->adap,
142 CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_NACK,
143 0, 1, 0, 0);
144 cec->tx = STATE_IDLE;
145 break;
146 case STATE_ERROR:
147 cec_transmit_done(cec->adap,
148 CEC_TX_STATUS_MAX_RETRIES | CEC_TX_STATUS_ERROR,
149 0, 0, 0, 1);
150 cec->tx = STATE_IDLE;
151 break;
152 case STATE_BUSY:
153 dev_err(cec->dev, "state set to busy, this should not occur here\n");
154 break;
155 default:
156 break;
157 }
158
159 switch (cec->rx) {
160 case STATE_DONE:
161 cec_received_msg(cec->adap, &cec->msg);
162 cec->rx = STATE_IDLE;
163 break;
164 default:
165 break;
166 }
167
168 return IRQ_HANDLED;
169}
170
171static const struct cec_adap_ops s5p_cec_adap_ops = {
172 .adap_enable = s5p_cec_adap_enable,
173 .adap_log_addr = s5p_cec_adap_log_addr,
174 .adap_transmit = s5p_cec_adap_transmit,
175};
176
177static int s5p_cec_probe(struct platform_device *pdev)
178{
179 struct device *dev = &pdev->dev;
180 struct device *hdmi_dev;
181 struct resource *res;
182 struct s5p_cec_dev *cec;
183 bool needs_hpd = of_property_read_bool(pdev->dev.of_node, "needs-hpd");
184 int ret;
185
186 hdmi_dev = cec_notifier_parse_hdmi_phandle(dev);
187
188 if (IS_ERR(hdmi_dev))
189 return PTR_ERR(hdmi_dev);
190
191 cec = devm_kzalloc(&pdev->dev, sizeof(*cec), GFP_KERNEL);
192 if (!cec)
193 return -ENOMEM;
194
195 cec->dev = dev;
196
197 cec->irq = platform_get_irq(pdev, 0);
198 if (cec->irq < 0)
199 return cec->irq;
200
201 ret = devm_request_threaded_irq(dev, cec->irq, s5p_cec_irq_handler,
202 s5p_cec_irq_handler_thread, 0, pdev->name, cec);
203 if (ret)
204 return ret;
205
206 cec->clk = devm_clk_get(dev, "hdmicec");
207 if (IS_ERR(cec->clk))
208 return PTR_ERR(cec->clk);
209
210 cec->pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
211 "samsung,syscon-phandle");
212 if (IS_ERR(cec->pmu))
213 return -EPROBE_DEFER;
214
215 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
216 cec->reg = devm_ioremap_resource(dev, res);
217 if (IS_ERR(cec->reg))
218 return PTR_ERR(cec->reg);
219
220 cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec, CEC_NAME,
221 CEC_CAP_DEFAULTS | (needs_hpd ? CEC_CAP_NEEDS_HPD : 0) |
222 CEC_CAP_CONNECTOR_INFO, 1);
223 ret = PTR_ERR_OR_ZERO(cec->adap);
224 if (ret)
225 return ret;
226
227 cec->notifier = cec_notifier_cec_adap_register(hdmi_dev, NULL,
228 cec->adap);
229 if (!cec->notifier) {
230 ret = -ENOMEM;
231 goto err_delete_adapter;
232 }
233
234 ret = cec_register_adapter(cec->adap, &pdev->dev);
235 if (ret)
236 goto err_notifier;
237
238 platform_set_drvdata(pdev, cec);
239 pm_runtime_enable(dev);
240
241 dev_dbg(dev, "successfully probed\n");
242 return 0;
243
244err_notifier:
245 cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
246
247err_delete_adapter:
248 cec_delete_adapter(cec->adap);
249 return ret;
250}
251
252static int s5p_cec_remove(struct platform_device *pdev)
253{
254 struct s5p_cec_dev *cec = platform_get_drvdata(pdev);
255
256 cec_notifier_cec_adap_unregister(cec->notifier, cec->adap);
257 cec_unregister_adapter(cec->adap);
258 pm_runtime_disable(&pdev->dev);
259 return 0;
260}
261
262static int __maybe_unused s5p_cec_runtime_suspend(struct device *dev)
263{
264 struct s5p_cec_dev *cec = dev_get_drvdata(dev);
265
266 clk_disable_unprepare(cec->clk);
267 return 0;
268}
269
270static int __maybe_unused s5p_cec_runtime_resume(struct device *dev)
271{
272 struct s5p_cec_dev *cec = dev_get_drvdata(dev);
273 int ret;
274
275 ret = clk_prepare_enable(cec->clk);
276 if (ret < 0)
277 return ret;
278 return 0;
279}
280
281static const struct dev_pm_ops s5p_cec_pm_ops = {
282 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
283 pm_runtime_force_resume)
284 SET_RUNTIME_PM_OPS(s5p_cec_runtime_suspend, s5p_cec_runtime_resume,
285 NULL)
286};
287
288static const struct of_device_id s5p_cec_match[] = {
289 {
290 .compatible = "samsung,s5p-cec",
291 },
292 {},
293};
294MODULE_DEVICE_TABLE(of, s5p_cec_match);
295
296static struct platform_driver s5p_cec_pdrv = {
297 .probe = s5p_cec_probe,
298 .remove = s5p_cec_remove,
299 .driver = {
300 .name = CEC_NAME,
301 .of_match_table = s5p_cec_match,
302 .pm = &s5p_cec_pm_ops,
303 },
304};
305
306module_platform_driver(s5p_cec_pdrv);
307
308MODULE_AUTHOR("Kamil Debski <kamil@wypas.org>");
309MODULE_LICENSE("GPL");
310MODULE_DESCRIPTION("Samsung S5P CEC driver");
311
