1 /* drivers/video/msm_fb/mddi_client_nt35399.c
2  *
3  * Support for Novatek NT35399 MDDI client of Sapphire
4  *
5  * Copyright (C) 2008 HTC Incorporated
6  * Author: Solomon Chiu (solomon_chiu@htc.com)
7  *
8  * This software is licensed under the terms of the GNU General Public
9  * License version 2, as published by the Free Software Foundation, and
10  * may be copied, distributed, and modified under those terms.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17 
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/platform_device.h>
21 #include <linux/interrupt.h>
22 #include <linux/sched.h>
23 #include <linux/gpio.h>
24 #include <linux/slab.h>
25 #include <mach/msm_fb.h>
26 
27 static DECLARE_WAIT_QUEUE_HEAD(nt35399_vsync_wait);
28 
29 struct panel_info {
30 	struct msm_mddi_client_data *client_data;
31 	struct platform_device pdev;
32 	struct msm_panel_data panel_data;
33 	struct msmfb_callback *fb_callback;
34 	struct work_struct panel_work;
35 	struct workqueue_struct *fb_wq;
36 	int nt35399_got_int;
37 };
38 
39 static void
nt35399_request_vsync(struct msm_panel_data * panel_data,struct msmfb_callback * callback)40 nt35399_request_vsync(struct msm_panel_data *panel_data,
41 		      struct msmfb_callback *callback)
42 {
43 	struct panel_info *panel = container_of(panel_data, struct panel_info,
44 						panel_data);
45 	struct msm_mddi_client_data *client_data = panel->client_data;
46 
47 	panel->fb_callback = callback;
48 	if (panel->nt35399_got_int) {
49 		panel->nt35399_got_int = 0;
50 		client_data->activate_link(client_data); /* clears interrupt */
51 	}
52 }
53 
nt35399_wait_vsync(struct msm_panel_data * panel_data)54 static void nt35399_wait_vsync(struct msm_panel_data *panel_data)
55 {
56 	struct panel_info *panel = container_of(panel_data, struct panel_info,
57 						panel_data);
58 	struct msm_mddi_client_data *client_data = panel->client_data;
59 
60 	if (panel->nt35399_got_int) {
61 		panel->nt35399_got_int = 0;
62 		client_data->activate_link(client_data); /* clears interrupt */
63 	}
64 
65 	if (wait_event_timeout(nt35399_vsync_wait, panel->nt35399_got_int,
66 				HZ/2) == 0)
67 		printk(KERN_ERR "timeout waiting for VSYNC\n");
68 
69 	panel->nt35399_got_int = 0;
70 	/* interrupt clears when screen dma starts */
71 }
72 
nt35399_suspend(struct msm_panel_data * panel_data)73 static int nt35399_suspend(struct msm_panel_data *panel_data)
74 {
75 	struct panel_info *panel = container_of(panel_data, struct panel_info,
76 						panel_data);
77 	struct msm_mddi_client_data *client_data = panel->client_data;
78 
79 	struct msm_mddi_bridge_platform_data *bridge_data =
80 		client_data->private_client_data;
81 	int ret;
82 
83 	ret = bridge_data->uninit(bridge_data, client_data);
84 	if (ret) {
85 		printk(KERN_INFO "mddi nt35399 client: non zero return from "
86 			"uninit\n");
87 		return ret;
88 	}
89 	client_data->suspend(client_data);
90 	return 0;
91 }
92 
nt35399_resume(struct msm_panel_data * panel_data)93 static int nt35399_resume(struct msm_panel_data *panel_data)
94 {
95 	struct panel_info *panel = container_of(panel_data, struct panel_info,
96 						panel_data);
97 	struct msm_mddi_client_data *client_data = panel->client_data;
98 
99 	struct msm_mddi_bridge_platform_data *bridge_data =
100 		client_data->private_client_data;
101 	int ret;
102 
103 	client_data->resume(client_data);
104 	ret = bridge_data->init(bridge_data, client_data);
105 	if (ret)
106 		return ret;
107 	return 0;
108 }
109 
nt35399_blank(struct msm_panel_data * panel_data)110 static int nt35399_blank(struct msm_panel_data *panel_data)
111 {
112 	struct panel_info *panel = container_of(panel_data, struct panel_info,
113 						panel_data);
114 	struct msm_mddi_client_data *client_data = panel->client_data;
115 	struct msm_mddi_bridge_platform_data *bridge_data =
116 		client_data->private_client_data;
117 
118 	return bridge_data->blank(bridge_data, client_data);
119 }
120 
nt35399_unblank(struct msm_panel_data * panel_data)121 static int nt35399_unblank(struct msm_panel_data *panel_data)
122 {
123 	struct panel_info *panel = container_of(panel_data, struct panel_info,
124 						panel_data);
125 	struct msm_mddi_client_data *client_data = panel->client_data;
126 	struct msm_mddi_bridge_platform_data *bridge_data =
127 		client_data->private_client_data;
128 
129 	return bridge_data->unblank(bridge_data, client_data);
130 }
131 
nt35399_vsync_interrupt(int irq,void * data)132 irqreturn_t nt35399_vsync_interrupt(int irq, void *data)
133 {
134 	struct panel_info *panel = data;
135 
136 	panel->nt35399_got_int = 1;
137 
138 	if (panel->fb_callback) {
139 		panel->fb_callback->func(panel->fb_callback);
140 		panel->fb_callback = NULL;
141 	}
142 
143 	wake_up(&nt35399_vsync_wait);
144 
145 	return IRQ_HANDLED;
146 }
147 
setup_vsync(struct panel_info * panel,int init)148 static int setup_vsync(struct panel_info *panel, int init)
149 {
150 	int ret;
151 	int gpio = 97;
152 	unsigned int irq;
153 
154 	if (!init) {
155 		ret = 0;
156 		goto uninit;
157 	}
158 	ret = gpio_request(gpio, "vsync");
159 	if (ret)
160 		goto err_request_gpio_failed;
161 
162 	ret = gpio_direction_input(gpio);
163 	if (ret)
164 		goto err_gpio_direction_input_failed;
165 
166 	ret = irq = gpio_to_irq(gpio);
167 	if (ret < 0)
168 		goto err_get_irq_num_failed;
169 
170 	ret = request_irq(irq, nt35399_vsync_interrupt, IRQF_TRIGGER_RISING,
171 			  "vsync", panel);
172 	if (ret)
173 		goto err_request_irq_failed;
174 
175 	printk(KERN_INFO "vsync on gpio %d now %d\n",
176 	       gpio, gpio_get_value(gpio));
177 	return 0;
178 
179 uninit:
180 	free_irq(gpio_to_irq(gpio), panel->client_data);
181 err_request_irq_failed:
182 err_get_irq_num_failed:
183 err_gpio_direction_input_failed:
184 	gpio_free(gpio);
185 err_request_gpio_failed:
186 	return ret;
187 }
188 
mddi_nt35399_probe(struct platform_device * pdev)189 static int mddi_nt35399_probe(struct platform_device *pdev)
190 {
191 	struct msm_mddi_client_data *client_data = pdev->dev.platform_data;
192 	struct msm_mddi_bridge_platform_data *bridge_data =
193 		client_data->private_client_data;
194 
195 	int ret;
196 
197 	struct panel_info *panel = kzalloc(sizeof(struct panel_info),
198 					   GFP_KERNEL);
199 
200 	printk(KERN_DEBUG "%s: enter.\n", __func__);
201 
202 	if (!panel)
203 		return -ENOMEM;
204 	platform_set_drvdata(pdev, panel);
205 
206 	ret = setup_vsync(panel, 1);
207 	if (ret) {
208 		dev_err(&pdev->dev, "mddi_nt35399_setup_vsync failed\n");
209 		return ret;
210 	}
211 
212 	panel->client_data = client_data;
213 	panel->panel_data.suspend = nt35399_suspend;
214 	panel->panel_data.resume = nt35399_resume;
215 	panel->panel_data.wait_vsync = nt35399_wait_vsync;
216 	panel->panel_data.request_vsync = nt35399_request_vsync;
217 	panel->panel_data.blank = nt35399_blank;
218 	panel->panel_data.unblank = nt35399_unblank;
219 	panel->panel_data.fb_data = &bridge_data->fb_data;
220 	panel->panel_data.caps = 0;
221 
222 	panel->pdev.name = "msm_panel";
223 	panel->pdev.id = pdev->id;
224 	panel->pdev.resource = client_data->fb_resource;
225 	panel->pdev.num_resources = 1;
226 	panel->pdev.dev.platform_data = &panel->panel_data;
227 
228 	if (bridge_data->init)
229 		bridge_data->init(bridge_data, client_data);
230 
231 	platform_device_register(&panel->pdev);
232 
233 	return 0;
234 }
235 
mddi_nt35399_remove(struct platform_device * pdev)236 static int mddi_nt35399_remove(struct platform_device *pdev)
237 {
238 	struct panel_info *panel = platform_get_drvdata(pdev);
239 
240 	setup_vsync(panel, 0);
241 	kfree(panel);
242 	return 0;
243 }
244 
245 static struct platform_driver mddi_client_0bda_8a47 = {
246 	.probe = mddi_nt35399_probe,
247 	.remove = mddi_nt35399_remove,
248 	.driver = { .name = "mddi_c_0bda_8a47" },
249 };
250 
mddi_client_nt35399_init(void)251 static int __init mddi_client_nt35399_init(void)
252 {
253 	return platform_driver_register(&mddi_client_0bda_8a47);
254 }
255 
256 module_init(mddi_client_nt35399_init);
257 
258