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panel-lgphilips-lb035q02.c
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1 /*
2  * LCD panel driver for LG.Philips LB035Q02
3  *
4  * Author: Steve Sakoman <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License version 2 as published by
8  * the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License along with
16  * this program. If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/spi/spi.h>
22 #include <linux/mutex.h>
23 
24 #include <video/omapdss.h>
25 
26 struct lb035q02_data {
27  struct mutex lock;
28 };
29 
30 static struct omap_video_timings lb035q02_timings = {
31  .x_res = 320,
32  .y_res = 240,
33 
34  .pixel_clock = 6500,
35 
36  .hsw = 2,
37  .hfp = 20,
38  .hbp = 68,
39 
40  .vsw = 2,
41  .vfp = 4,
42  .vbp = 18,
43 
44  .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
45  .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
46  .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
47  .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
48  .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
49 };
50 
51 static int lb035q02_panel_power_on(struct omap_dss_device *dssdev)
52 {
53  int r;
54 
55  if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
56  return 0;
57 
58  omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
59  omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
60 
61  r = omapdss_dpi_display_enable(dssdev);
62  if (r)
63  goto err0;
64 
65  if (dssdev->platform_enable) {
66  r = dssdev->platform_enable(dssdev);
67  if (r)
68  goto err1;
69  }
70 
71  return 0;
72 err1:
73  omapdss_dpi_display_disable(dssdev);
74 err0:
75  return r;
76 }
77 
78 static void lb035q02_panel_power_off(struct omap_dss_device *dssdev)
79 {
80  if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
81  return;
82 
83  if (dssdev->platform_disable)
84  dssdev->platform_disable(dssdev);
85 
86  omapdss_dpi_display_disable(dssdev);
87 }
88 
89 static int lb035q02_panel_probe(struct omap_dss_device *dssdev)
90 {
91  struct lb035q02_data *ld;
92  int r;
93 
94  dssdev->panel.timings = lb035q02_timings;
95 
96  ld = kzalloc(sizeof(*ld), GFP_KERNEL);
97  if (!ld) {
98  r = -ENOMEM;
99  goto err;
100  }
101  mutex_init(&ld->lock);
102  dev_set_drvdata(&dssdev->dev, ld);
103  return 0;
104 err:
105  return r;
106 }
107 
108 static void lb035q02_panel_remove(struct omap_dss_device *dssdev)
109 {
110  struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
111 
112  kfree(ld);
113 }
114 
115 static int lb035q02_panel_enable(struct omap_dss_device *dssdev)
116 {
117  struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
118  int r;
119 
120  mutex_lock(&ld->lock);
121 
122  r = lb035q02_panel_power_on(dssdev);
123  if (r)
124  goto err;
125  dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
126 
127  mutex_unlock(&ld->lock);
128  return 0;
129 err:
130  mutex_unlock(&ld->lock);
131  return r;
132 }
133 
134 static void lb035q02_panel_disable(struct omap_dss_device *dssdev)
135 {
136  struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
137 
138  mutex_lock(&ld->lock);
139 
140  lb035q02_panel_power_off(dssdev);
141  dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
142 
143  mutex_unlock(&ld->lock);
144 }
145 
146 static int lb035q02_panel_suspend(struct omap_dss_device *dssdev)
147 {
148  struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
149 
150  mutex_lock(&ld->lock);
151 
152  lb035q02_panel_power_off(dssdev);
153  dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
154 
155  mutex_unlock(&ld->lock);
156  return 0;
157 }
158 
159 static int lb035q02_panel_resume(struct omap_dss_device *dssdev)
160 {
161  struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
162  int r;
163 
164  mutex_lock(&ld->lock);
165 
166  r = lb035q02_panel_power_on(dssdev);
167  if (r)
168  goto err;
169  dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
170 
171  mutex_unlock(&ld->lock);
172  return 0;
173 err:
174  mutex_unlock(&ld->lock);
175  return r;
176 }
177 
178 static struct omap_dss_driver lb035q02_driver = {
179  .probe = lb035q02_panel_probe,
180  .remove = lb035q02_panel_remove,
181 
182  .enable = lb035q02_panel_enable,
183  .disable = lb035q02_panel_disable,
184  .suspend = lb035q02_panel_suspend,
185  .resume = lb035q02_panel_resume,
186 
187  .driver = {
188  .name = "lgphilips_lb035q02_panel",
189  .owner = THIS_MODULE,
190  },
191 };
192 
193 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
194 {
195  struct spi_message msg;
196  struct spi_transfer index_xfer = {
197  .len = 3,
198  .cs_change = 1,
199  };
200  struct spi_transfer value_xfer = {
201  .len = 3,
202  };
203  u8 buffer[16];
204 
205  spi_message_init(&msg);
206 
207  /* register index */
208  buffer[0] = 0x70;
209  buffer[1] = 0x00;
210  buffer[2] = reg & 0x7f;
211  index_xfer.tx_buf = buffer;
212  spi_message_add_tail(&index_xfer, &msg);
213 
214  /* register value */
215  buffer[4] = 0x72;
216  buffer[5] = val >> 8;
217  buffer[6] = val;
218  value_xfer.tx_buf = buffer + 4;
219  spi_message_add_tail(&value_xfer, &msg);
220 
221  return spi_sync(spi, &msg);
222 }
223 
224 static void init_lb035q02_panel(struct spi_device *spi)
225 {
226  /* Init sequence from page 28 of the lb035q02 spec */
227  lb035q02_write_reg(spi, 0x01, 0x6300);
228  lb035q02_write_reg(spi, 0x02, 0x0200);
229  lb035q02_write_reg(spi, 0x03, 0x0177);
230  lb035q02_write_reg(spi, 0x04, 0x04c7);
231  lb035q02_write_reg(spi, 0x05, 0xffc0);
232  lb035q02_write_reg(spi, 0x06, 0xe806);
233  lb035q02_write_reg(spi, 0x0a, 0x4008);
234  lb035q02_write_reg(spi, 0x0b, 0x0000);
235  lb035q02_write_reg(spi, 0x0d, 0x0030);
236  lb035q02_write_reg(spi, 0x0e, 0x2800);
237  lb035q02_write_reg(spi, 0x0f, 0x0000);
238  lb035q02_write_reg(spi, 0x16, 0x9f80);
239  lb035q02_write_reg(spi, 0x17, 0x0a0f);
240  lb035q02_write_reg(spi, 0x1e, 0x00c1);
241  lb035q02_write_reg(spi, 0x30, 0x0300);
242  lb035q02_write_reg(spi, 0x31, 0x0007);
243  lb035q02_write_reg(spi, 0x32, 0x0000);
244  lb035q02_write_reg(spi, 0x33, 0x0000);
245  lb035q02_write_reg(spi, 0x34, 0x0707);
246  lb035q02_write_reg(spi, 0x35, 0x0004);
247  lb035q02_write_reg(spi, 0x36, 0x0302);
248  lb035q02_write_reg(spi, 0x37, 0x0202);
249  lb035q02_write_reg(spi, 0x3a, 0x0a0d);
250  lb035q02_write_reg(spi, 0x3b, 0x0806);
251 }
252 
253 static int __devinit lb035q02_panel_spi_probe(struct spi_device *spi)
254 {
255  init_lb035q02_panel(spi);
256  return omap_dss_register_driver(&lb035q02_driver);
257 }
258 
259 static int __devexit lb035q02_panel_spi_remove(struct spi_device *spi)
260 {
261  omap_dss_unregister_driver(&lb035q02_driver);
262  return 0;
263 }
264 
265 static struct spi_driver lb035q02_spi_driver = {
266  .driver = {
267  .name = "lgphilips_lb035q02_panel-spi",
268  .owner = THIS_MODULE,
269  },
270  .probe = lb035q02_panel_spi_probe,
271  .remove = __devexit_p(lb035q02_panel_spi_remove),
272 };
273 
274 module_spi_driver(lb035q02_spi_driver);
275 
276 MODULE_LICENSE("GPL");
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