1 // SPDX-License-Identifier: GPL-2.0-only
2 /* drivers/video/backlight/vgg2432a4.c
3 *
4 * VGG2432A4 (ILI9320) LCD controller driver.
5 *
6 * Copyright 2007 Simtec Electronics
7 * http://armlinux.simtec.co.uk/
8 * Ben Dooks <ben@simtec.co.uk>
9 */
10
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/lcd.h>
15 #include <linux/module.h>
16
17 #include <linux/spi/spi.h>
18
19 #include <video/ili9320.h>
20
21 #include "ili9320.h"
22
23 /* Device initialisation sequences */
24
25 static const struct ili9320_reg vgg_init1[] = {
26 {
27 .address = ILI9320_POWER1,
28 .value = ILI9320_POWER1_AP(0) | ILI9320_POWER1_BT(0),
29 }, {
30 .address = ILI9320_POWER2,
31 .value = (ILI9320_POWER2_VC(7) |
32 ILI9320_POWER2_DC0(0) | ILI9320_POWER2_DC1(0)),
33 }, {
34 .address = ILI9320_POWER3,
35 .value = ILI9320_POWER3_VRH(0),
36 }, {
37 .address = ILI9320_POWER4,
38 .value = ILI9320_POWER4_VREOUT(0),
39 },
40 };
41
42 static const struct ili9320_reg vgg_init2[] = {
43 {
44 .address = ILI9320_POWER1,
45 .value = (ILI9320_POWER1_AP(3) | ILI9320_POWER1_APE |
46 ILI9320_POWER1_BT(7) | ILI9320_POWER1_SAP),
47 }, {
48 .address = ILI9320_POWER2,
49 .value = ILI9320_POWER2_VC(7) | ILI9320_POWER2_DC0(3),
50 }
51 };
52
53 static const struct ili9320_reg vgg_gamma[] = {
54 {
55 .address = ILI9320_GAMMA1,
56 .value = 0x0000,
57 }, {
58 .address = ILI9320_GAMMA2,
59 .value = 0x0505,
60 }, {
61 .address = ILI9320_GAMMA3,
62 .value = 0x0004,
63 }, {
64 .address = ILI9320_GAMMA4,
65 .value = 0x0006,
66 }, {
67 .address = ILI9320_GAMMA5,
68 .value = 0x0707,
69 }, {
70 .address = ILI9320_GAMMA6,
71 .value = 0x0105,
72 }, {
73 .address = ILI9320_GAMMA7,
74 .value = 0x0002,
75 }, {
76 .address = ILI9320_GAMMA8,
77 .value = 0x0707,
78 }, {
79 .address = ILI9320_GAMMA9,
80 .value = 0x0704,
81 }, {
82 .address = ILI9320_GAMMA10,
83 .value = 0x807,
84 }
85
86 };
87
88 static const struct ili9320_reg vgg_init0[] = {
89 [0] = {
90 /* set direction and scan mode gate */
91 .address = ILI9320_DRIVER,
92 .value = ILI9320_DRIVER_SS,
93 }, {
94 .address = ILI9320_DRIVEWAVE,
95 .value = (ILI9320_DRIVEWAVE_MUSTSET |
96 ILI9320_DRIVEWAVE_EOR | ILI9320_DRIVEWAVE_BC),
97 }, {
98 .address = ILI9320_ENTRYMODE,
99 .value = ILI9320_ENTRYMODE_ID(3) | ILI9320_ENTRYMODE_BGR,
100 }, {
101 .address = ILI9320_RESIZING,
102 .value = 0x0,
103 },
104 };
105
106
vgg2432a4_lcd_init(struct ili9320 * lcd,struct ili9320_platdata * cfg)107 static int vgg2432a4_lcd_init(struct ili9320 *lcd,
108 struct ili9320_platdata *cfg)
109 {
110 unsigned int addr;
111 int ret;
112
113 /* Set VCore before anything else (VGG243237-6UFLWA) */
114 ret = ili9320_write(lcd, 0x00e5, 0x8000);
115 if (ret)
116 goto err_initial;
117
118 /* Start the oscillator up before we can do anything else. */
119 ret = ili9320_write(lcd, ILI9320_OSCILATION, ILI9320_OSCILATION_OSC);
120 if (ret)
121 goto err_initial;
122
123 /* must wait at-lesat 10ms after starting */
124 mdelay(15);
125
126 ret = ili9320_write_regs(lcd, vgg_init0, ARRAY_SIZE(vgg_init0));
127 if (ret != 0)
128 goto err_initial;
129
130 ili9320_write(lcd, ILI9320_DISPLAY2, cfg->display2);
131 ili9320_write(lcd, ILI9320_DISPLAY3, cfg->display3);
132 ili9320_write(lcd, ILI9320_DISPLAY4, cfg->display4);
133
134 ili9320_write(lcd, ILI9320_RGB_IF1, cfg->rgb_if1);
135 ili9320_write(lcd, ILI9320_FRAMEMAKER, 0x0);
136 ili9320_write(lcd, ILI9320_RGB_IF2, cfg->rgb_if2);
137
138 ret = ili9320_write_regs(lcd, vgg_init1, ARRAY_SIZE(vgg_init1));
139 if (ret != 0)
140 goto err_vgg;
141
142 mdelay(300);
143
144 ret = ili9320_write_regs(lcd, vgg_init2, ARRAY_SIZE(vgg_init2));
145 if (ret != 0)
146 goto err_vgg2;
147
148 mdelay(100);
149
150 ili9320_write(lcd, ILI9320_POWER3, 0x13c);
151
152 mdelay(100);
153
154 ili9320_write(lcd, ILI9320_POWER4, 0x1c00);
155 ili9320_write(lcd, ILI9320_POWER7, 0x000e);
156
157 mdelay(100);
158
159 ili9320_write(lcd, ILI9320_GRAM_HORIZ_ADDR, 0x00);
160 ili9320_write(lcd, ILI9320_GRAM_VERT_ADD, 0x00);
161
162 ret = ili9320_write_regs(lcd, vgg_gamma, ARRAY_SIZE(vgg_gamma));
163 if (ret != 0)
164 goto err_vgg3;
165
166 ili9320_write(lcd, ILI9320_HORIZ_START, 0x0);
167 ili9320_write(lcd, ILI9320_HORIZ_END, cfg->hsize - 1);
168 ili9320_write(lcd, ILI9320_VERT_START, 0x0);
169 ili9320_write(lcd, ILI9320_VERT_END, cfg->vsize - 1);
170
171 ili9320_write(lcd, ILI9320_DRIVER2,
172 ILI9320_DRIVER2_NL(((cfg->vsize - 240) / 8) + 0x1D));
173
174 ili9320_write(lcd, ILI9320_BASE_IMAGE, 0x1);
175 ili9320_write(lcd, ILI9320_VERT_SCROLL, 0x00);
176
177 for (addr = ILI9320_PARTIAL1_POSITION; addr <= ILI9320_PARTIAL2_END;
178 addr++) {
179 ili9320_write(lcd, addr, 0x0);
180 }
181
182 ili9320_write(lcd, ILI9320_INTERFACE1, 0x10);
183 ili9320_write(lcd, ILI9320_INTERFACE2, cfg->interface2);
184 ili9320_write(lcd, ILI9320_INTERFACE3, cfg->interface3);
185 ili9320_write(lcd, ILI9320_INTERFACE4, cfg->interface4);
186 ili9320_write(lcd, ILI9320_INTERFACE5, cfg->interface5);
187 ili9320_write(lcd, ILI9320_INTERFACE6, cfg->interface6);
188
189 lcd->display1 = (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_DTE |
190 ILI9320_DISPLAY1_GON | ILI9320_DISPLAY1_BASEE |
191 0x40);
192
193 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
194
195 return 0;
196
197 err_vgg3:
198 err_vgg2:
199 err_vgg:
200 err_initial:
201 return ret;
202 }
203
204 #ifdef CONFIG_PM_SLEEP
vgg2432a4_suspend(struct device * dev)205 static int vgg2432a4_suspend(struct device *dev)
206 {
207 return ili9320_suspend(dev_get_drvdata(dev));
208 }
vgg2432a4_resume(struct device * dev)209 static int vgg2432a4_resume(struct device *dev)
210 {
211 return ili9320_resume(dev_get_drvdata(dev));
212 }
213 #endif
214
215 static struct ili9320_client vgg2432a4_client = {
216 .name = "VGG2432A4",
217 .init = vgg2432a4_lcd_init,
218 };
219
220 /* Device probe */
221
vgg2432a4_probe(struct spi_device * spi)222 static int vgg2432a4_probe(struct spi_device *spi)
223 {
224 int ret;
225
226 ret = ili9320_probe_spi(spi, &vgg2432a4_client);
227 if (ret != 0) {
228 dev_err(&spi->dev, "failed to initialise ili9320\n");
229 return ret;
230 }
231
232 return 0;
233 }
234
vgg2432a4_remove(struct spi_device * spi)235 static void vgg2432a4_remove(struct spi_device *spi)
236 {
237 ili9320_remove(spi_get_drvdata(spi));
238 }
239
vgg2432a4_shutdown(struct spi_device * spi)240 static void vgg2432a4_shutdown(struct spi_device *spi)
241 {
242 ili9320_shutdown(spi_get_drvdata(spi));
243 }
244
245 static SIMPLE_DEV_PM_OPS(vgg2432a4_pm_ops, vgg2432a4_suspend, vgg2432a4_resume);
246
247 static struct spi_driver vgg2432a4_driver = {
248 .driver = {
249 .name = "VGG2432A4",
250 .pm = &vgg2432a4_pm_ops,
251 },
252 .probe = vgg2432a4_probe,
253 .remove = vgg2432a4_remove,
254 .shutdown = vgg2432a4_shutdown,
255 };
256
257 module_spi_driver(vgg2432a4_driver);
258
259 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
260 MODULE_DESCRIPTION("VGG2432A4 LCD Driver");
261 MODULE_LICENSE("GPL v2");
262 MODULE_ALIAS("spi:VGG2432A4");
263