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d8f4a9ed TR |
1 | /* |
2 | * Copyright (C) 2012 Avionic Design GmbH | |
3 | * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/of_gpio.h> | |
12 | #include <linux/of_i2c.h> | |
13 | ||
14 | #include "drm.h" | |
15 | ||
16 | static int tegra_connector_get_modes(struct drm_connector *connector) | |
17 | { | |
18 | struct tegra_output *output = connector_to_output(connector); | |
19 | struct edid *edid = NULL; | |
20 | int err = 0; | |
21 | ||
22 | if (output->edid) | |
23 | edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL); | |
24 | else if (output->ddc) | |
25 | edid = drm_get_edid(connector, output->ddc); | |
26 | ||
27 | drm_mode_connector_update_edid_property(connector, edid); | |
28 | ||
29 | if (edid) { | |
30 | err = drm_add_edid_modes(connector, edid); | |
31 | kfree(edid); | |
32 | } | |
33 | ||
34 | return err; | |
35 | } | |
36 | ||
37 | static int tegra_connector_mode_valid(struct drm_connector *connector, | |
38 | struct drm_display_mode *mode) | |
39 | { | |
40 | struct tegra_output *output = connector_to_output(connector); | |
41 | enum drm_mode_status status = MODE_OK; | |
42 | int err; | |
43 | ||
44 | err = tegra_output_check_mode(output, mode, &status); | |
45 | if (err < 0) | |
46 | return MODE_ERROR; | |
47 | ||
48 | return status; | |
49 | } | |
50 | ||
51 | static struct drm_encoder * | |
52 | tegra_connector_best_encoder(struct drm_connector *connector) | |
53 | { | |
54 | struct tegra_output *output = connector_to_output(connector); | |
55 | ||
56 | return &output->encoder; | |
57 | } | |
58 | ||
59 | static const struct drm_connector_helper_funcs connector_helper_funcs = { | |
60 | .get_modes = tegra_connector_get_modes, | |
61 | .mode_valid = tegra_connector_mode_valid, | |
62 | .best_encoder = tegra_connector_best_encoder, | |
63 | }; | |
64 | ||
65 | static enum drm_connector_status | |
66 | tegra_connector_detect(struct drm_connector *connector, bool force) | |
67 | { | |
68 | struct tegra_output *output = connector_to_output(connector); | |
69 | enum drm_connector_status status = connector_status_unknown; | |
70 | ||
71 | if (gpio_is_valid(output->hpd_gpio)) { | |
72 | if (gpio_get_value(output->hpd_gpio) == 0) | |
73 | status = connector_status_disconnected; | |
74 | else | |
75 | status = connector_status_connected; | |
76 | } else { | |
77 | if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) | |
78 | status = connector_status_connected; | |
79 | } | |
80 | ||
81 | return status; | |
82 | } | |
83 | ||
84 | static void tegra_connector_destroy(struct drm_connector *connector) | |
85 | { | |
86 | drm_sysfs_connector_remove(connector); | |
87 | drm_connector_cleanup(connector); | |
88 | } | |
89 | ||
90 | static const struct drm_connector_funcs connector_funcs = { | |
91 | .dpms = drm_helper_connector_dpms, | |
92 | .detect = tegra_connector_detect, | |
93 | .fill_modes = drm_helper_probe_single_connector_modes, | |
94 | .destroy = tegra_connector_destroy, | |
95 | }; | |
96 | ||
97 | static void tegra_encoder_destroy(struct drm_encoder *encoder) | |
98 | { | |
99 | drm_encoder_cleanup(encoder); | |
100 | } | |
101 | ||
102 | static const struct drm_encoder_funcs encoder_funcs = { | |
103 | .destroy = tegra_encoder_destroy, | |
104 | }; | |
105 | ||
106 | static void tegra_encoder_dpms(struct drm_encoder *encoder, int mode) | |
107 | { | |
108 | } | |
109 | ||
110 | static bool tegra_encoder_mode_fixup(struct drm_encoder *encoder, | |
111 | const struct drm_display_mode *mode, | |
112 | struct drm_display_mode *adjusted) | |
113 | { | |
114 | return true; | |
115 | } | |
116 | ||
117 | static void tegra_encoder_prepare(struct drm_encoder *encoder) | |
118 | { | |
119 | } | |
120 | ||
121 | static void tegra_encoder_commit(struct drm_encoder *encoder) | |
122 | { | |
123 | } | |
124 | ||
125 | static void tegra_encoder_mode_set(struct drm_encoder *encoder, | |
126 | struct drm_display_mode *mode, | |
127 | struct drm_display_mode *adjusted) | |
128 | { | |
129 | struct tegra_output *output = encoder_to_output(encoder); | |
130 | int err; | |
131 | ||
132 | err = tegra_output_enable(output); | |
133 | if (err < 0) | |
134 | dev_err(encoder->dev->dev, "tegra_output_enable(): %d\n", err); | |
135 | } | |
136 | ||
137 | static const struct drm_encoder_helper_funcs encoder_helper_funcs = { | |
138 | .dpms = tegra_encoder_dpms, | |
139 | .mode_fixup = tegra_encoder_mode_fixup, | |
140 | .prepare = tegra_encoder_prepare, | |
141 | .commit = tegra_encoder_commit, | |
142 | .mode_set = tegra_encoder_mode_set, | |
143 | }; | |
144 | ||
145 | static irqreturn_t hpd_irq(int irq, void *data) | |
146 | { | |
147 | struct tegra_output *output = data; | |
148 | ||
149 | drm_helper_hpd_irq_event(output->connector.dev); | |
150 | ||
151 | return IRQ_HANDLED; | |
152 | } | |
153 | ||
154 | int tegra_output_parse_dt(struct tegra_output *output) | |
155 | { | |
156 | enum of_gpio_flags flags; | |
157 | struct device_node *ddc; | |
158 | size_t size; | |
159 | int err; | |
160 | ||
161 | if (!output->of_node) | |
162 | output->of_node = output->dev->of_node; | |
163 | ||
164 | output->edid = of_get_property(output->of_node, "nvidia,edid", &size); | |
165 | ||
166 | ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0); | |
167 | if (ddc) { | |
168 | output->ddc = of_find_i2c_adapter_by_node(ddc); | |
169 | if (!output->ddc) { | |
170 | err = -EPROBE_DEFER; | |
171 | of_node_put(ddc); | |
172 | return err; | |
173 | } | |
174 | ||
175 | of_node_put(ddc); | |
176 | } | |
177 | ||
178 | if (!output->edid && !output->ddc) | |
179 | return -ENODEV; | |
180 | ||
181 | output->hpd_gpio = of_get_named_gpio_flags(output->of_node, | |
182 | "nvidia,hpd-gpio", 0, | |
183 | &flags); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | int tegra_output_init(struct drm_device *drm, struct tegra_output *output) | |
189 | { | |
190 | int connector, encoder, err; | |
191 | ||
192 | if (gpio_is_valid(output->hpd_gpio)) { | |
193 | unsigned long flags; | |
194 | ||
195 | err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN, | |
196 | "HDMI hotplug detect"); | |
197 | if (err < 0) { | |
198 | dev_err(output->dev, "gpio_request_one(): %d\n", err); | |
199 | return err; | |
200 | } | |
201 | ||
202 | err = gpio_to_irq(output->hpd_gpio); | |
203 | if (err < 0) { | |
204 | dev_err(output->dev, "gpio_to_irq(): %d\n", err); | |
205 | goto free_hpd; | |
206 | } | |
207 | ||
208 | output->hpd_irq = err; | |
209 | ||
210 | flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | | |
211 | IRQF_ONESHOT; | |
212 | ||
213 | err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq, | |
214 | flags, "hpd", output); | |
215 | if (err < 0) { | |
216 | dev_err(output->dev, "failed to request IRQ#%u: %d\n", | |
217 | output->hpd_irq, err); | |
218 | goto free_hpd; | |
219 | } | |
220 | ||
221 | output->connector.polled = DRM_CONNECTOR_POLL_HPD; | |
222 | } | |
223 | ||
224 | switch (output->type) { | |
225 | case TEGRA_OUTPUT_RGB: | |
226 | connector = DRM_MODE_CONNECTOR_LVDS; | |
227 | encoder = DRM_MODE_ENCODER_LVDS; | |
228 | break; | |
229 | ||
edec4af4 TR |
230 | case TEGRA_OUTPUT_HDMI: |
231 | connector = DRM_MODE_CONNECTOR_HDMIA; | |
232 | encoder = DRM_MODE_ENCODER_TMDS; | |
233 | break; | |
234 | ||
d8f4a9ed TR |
235 | default: |
236 | connector = DRM_MODE_CONNECTOR_Unknown; | |
237 | encoder = DRM_MODE_ENCODER_NONE; | |
238 | break; | |
239 | } | |
240 | ||
241 | drm_connector_init(drm, &output->connector, &connector_funcs, | |
242 | connector); | |
243 | drm_connector_helper_add(&output->connector, &connector_helper_funcs); | |
244 | ||
245 | drm_encoder_init(drm, &output->encoder, &encoder_funcs, encoder); | |
246 | drm_encoder_helper_add(&output->encoder, &encoder_helper_funcs); | |
247 | ||
248 | drm_mode_connector_attach_encoder(&output->connector, &output->encoder); | |
249 | drm_sysfs_connector_add(&output->connector); | |
250 | ||
251 | output->encoder.possible_crtcs = 0x3; | |
252 | ||
253 | return 0; | |
254 | ||
255 | free_hpd: | |
256 | gpio_free(output->hpd_gpio); | |
257 | ||
258 | return err; | |
259 | } | |
260 | ||
261 | int tegra_output_exit(struct tegra_output *output) | |
262 | { | |
263 | if (gpio_is_valid(output->hpd_gpio)) { | |
264 | free_irq(output->hpd_irq, output); | |
265 | gpio_free(output->hpd_gpio); | |
266 | } | |
267 | ||
268 | if (output->ddc) | |
269 | put_device(&output->ddc->dev); | |
270 | ||
271 | return 0; | |
272 | } |