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/fb.h>
14 #include <linux/init.h>
15 #include <linux/lcd.h>
16 #include <linux/module.h>
17 
18 #include <linux/spi/spi.h>
19 
20 #include <video/ili9320.h>
21 
22 #include "ili9320.h"
23 
24 /* Device initialisation sequences */
25 
26 static const struct ili9320_reg vgg_init1[] = {
27 	{
28 		.address = ILI9320_POWER1,
29 		.value	 = ILI9320_POWER1_AP(0) | ILI9320_POWER1_BT(0),
30 	}, {
31 		.address = ILI9320_POWER2,
32 		.value	 = (ILI9320_POWER2_VC(7) |
33 			    ILI9320_POWER2_DC0(0) | ILI9320_POWER2_DC1(0)),
34 	}, {
35 		.address = ILI9320_POWER3,
36 		.value	 = ILI9320_POWER3_VRH(0),
37 	}, {
38 		.address = ILI9320_POWER4,
39 		.value	 = ILI9320_POWER4_VREOUT(0),
40 	},
41 };
42 
43 static const struct ili9320_reg vgg_init2[] = {
44 	{
45 		.address = ILI9320_POWER1,
46 		.value   = (ILI9320_POWER1_AP(3) | ILI9320_POWER1_APE |
47 			    ILI9320_POWER1_BT(7) | ILI9320_POWER1_SAP),
48 	}, {
49 		.address = ILI9320_POWER2,
50 		.value   = ILI9320_POWER2_VC(7) | ILI9320_POWER2_DC0(3),
51 	}
52 };
53 
54 static const struct ili9320_reg vgg_gamma[] = {
55 	{
56 		.address = ILI9320_GAMMA1,
57 		.value	 = 0x0000,
58 	}, {
59 		.address = ILI9320_GAMMA2,
60 		.value   = 0x0505,
61 	}, {
62 		.address = ILI9320_GAMMA3,
63 		.value	 = 0x0004,
64 	}, {
65 		.address = ILI9320_GAMMA4,
66 		.value	 = 0x0006,
67 	}, {
68 		.address = ILI9320_GAMMA5,
69 		.value	 = 0x0707,
70 	}, {
71 		.address = ILI9320_GAMMA6,
72 		.value	 = 0x0105,
73 	}, {
74 		.address = ILI9320_GAMMA7,
75 		.value	 = 0x0002,
76 	}, {
77 		.address = ILI9320_GAMMA8,
78 		.value	 = 0x0707,
79 	}, {
80 		.address = ILI9320_GAMMA9,
81 		.value	 = 0x0704,
82 	}, {
83 		.address = ILI9320_GAMMA10,
84 		.value	 = 0x807,
85 	}
86 
87 };
88 
89 static const struct ili9320_reg vgg_init0[] = {
90 	[0]	= {
91 		/* set direction and scan mode gate */
92 		.address = ILI9320_DRIVER,
93 		.value	 = ILI9320_DRIVER_SS,
94 	}, {
95 		.address = ILI9320_DRIVEWAVE,
96 		.value	 = (ILI9320_DRIVEWAVE_MUSTSET |
97 			    ILI9320_DRIVEWAVE_EOR | ILI9320_DRIVEWAVE_BC),
98 	}, {
99 		.address = ILI9320_ENTRYMODE,
100 		.value	 = ILI9320_ENTRYMODE_ID(3) | ILI9320_ENTRYMODE_BGR,
101 	}, {
102 		.address = ILI9320_RESIZING,
103 		.value	 = 0x0,
104 	},
105 };
106 
107 
108 static int vgg2432a4_lcd_init(struct ili9320 *lcd,
109 			      struct ili9320_platdata *cfg)
110 {
111 	unsigned int addr;
112 	int ret;
113 
114 	/* Set VCore before anything else (VGG243237-6UFLWA) */
115 	ret = ili9320_write(lcd, 0x00e5, 0x8000);
116 	if (ret)
117 		goto err_initial;
118 
119 	/* Start the oscillator up before we can do anything else. */
120 	ret = ili9320_write(lcd, ILI9320_OSCILATION, ILI9320_OSCILATION_OSC);
121 	if (ret)
122 		goto err_initial;
123 
124 	/* must wait at-lesat 10ms after starting */
125 	mdelay(15);
126 
127 	ret = ili9320_write_regs(lcd, vgg_init0, ARRAY_SIZE(vgg_init0));
128 	if (ret != 0)
129 		goto err_initial;
130 
131 	ili9320_write(lcd, ILI9320_DISPLAY2, cfg->display2);
132 	ili9320_write(lcd, ILI9320_DISPLAY3, cfg->display3);
133 	ili9320_write(lcd, ILI9320_DISPLAY4, cfg->display4);
134 
135 	ili9320_write(lcd, ILI9320_RGB_IF1, cfg->rgb_if1);
136 	ili9320_write(lcd, ILI9320_FRAMEMAKER, 0x0);
137 	ili9320_write(lcd, ILI9320_RGB_IF2, cfg->rgb_if2);
138 
139 	ret = ili9320_write_regs(lcd, vgg_init1, ARRAY_SIZE(vgg_init1));
140 	if (ret != 0)
141 		goto err_vgg;
142 
143 	mdelay(300);
144 
145 	ret = ili9320_write_regs(lcd, vgg_init2, ARRAY_SIZE(vgg_init2));
146 	if (ret != 0)
147 		goto err_vgg2;
148 
149 	mdelay(100);
150 
151 	ili9320_write(lcd, ILI9320_POWER3, 0x13c);
152 
153 	mdelay(100);
154 
155 	ili9320_write(lcd, ILI9320_POWER4, 0x1c00);
156 	ili9320_write(lcd, ILI9320_POWER7, 0x000e);
157 
158 	mdelay(100);
159 
160 	ili9320_write(lcd, ILI9320_GRAM_HORIZ_ADDR, 0x00);
161 	ili9320_write(lcd, ILI9320_GRAM_VERT_ADD, 0x00);
162 
163 	ret = ili9320_write_regs(lcd, vgg_gamma, ARRAY_SIZE(vgg_gamma));
164 	if (ret != 0)
165 		goto err_vgg3;
166 
167 	ili9320_write(lcd, ILI9320_HORIZ_START, 0x0);
168 	ili9320_write(lcd, ILI9320_HORIZ_END, cfg->hsize - 1);
169 	ili9320_write(lcd, ILI9320_VERT_START, 0x0);
170 	ili9320_write(lcd, ILI9320_VERT_END, cfg->vsize - 1);
171 
172 	ili9320_write(lcd, ILI9320_DRIVER2,
173 		      ILI9320_DRIVER2_NL(((cfg->vsize - 240) / 8) + 0x1D));
174 
175 	ili9320_write(lcd, ILI9320_BASE_IMAGE, 0x1);
176 	ili9320_write(lcd, ILI9320_VERT_SCROLL, 0x00);
177 
178 	for (addr = ILI9320_PARTIAL1_POSITION; addr <= ILI9320_PARTIAL2_END;
179 	     addr++) {
180 		ili9320_write(lcd, addr, 0x0);
181 	}
182 
183 	ili9320_write(lcd, ILI9320_INTERFACE1, 0x10);
184 	ili9320_write(lcd, ILI9320_INTERFACE2, cfg->interface2);
185 	ili9320_write(lcd, ILI9320_INTERFACE3, cfg->interface3);
186 	ili9320_write(lcd, ILI9320_INTERFACE4, cfg->interface4);
187 	ili9320_write(lcd, ILI9320_INTERFACE5, cfg->interface5);
188 	ili9320_write(lcd, ILI9320_INTERFACE6, cfg->interface6);
189 
190 	lcd->display1 = (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_DTE |
191 			 ILI9320_DISPLAY1_GON | ILI9320_DISPLAY1_BASEE |
192 			 0x40);
193 
194 	ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);
195 
196 	return 0;
197 
198  err_vgg3:
199  err_vgg2:
200  err_vgg:
201  err_initial:
202 	return ret;
203 }
204 
205 #ifdef CONFIG_PM_SLEEP
206 static int vgg2432a4_suspend(struct device *dev)
207 {
208 	return ili9320_suspend(dev_get_drvdata(dev));
209 }
210 static int vgg2432a4_resume(struct device *dev)
211 {
212 	return ili9320_resume(dev_get_drvdata(dev));
213 }
214 #endif
215 
216 static struct ili9320_client vgg2432a4_client = {
217 	.name	= "VGG2432A4",
218 	.init	= vgg2432a4_lcd_init,
219 };
220 
221 /* Device probe */
222 
223 static int vgg2432a4_probe(struct spi_device *spi)
224 {
225 	int ret;
226 
227 	ret = ili9320_probe_spi(spi, &vgg2432a4_client);
228 	if (ret != 0) {
229 		dev_err(&spi->dev, "failed to initialise ili9320\n");
230 		return ret;
231 	}
232 
233 	return 0;
234 }
235 
236 static void vgg2432a4_remove(struct spi_device *spi)
237 {
238 	ili9320_remove(spi_get_drvdata(spi));
239 }
240 
241 static void vgg2432a4_shutdown(struct spi_device *spi)
242 {
243 	ili9320_shutdown(spi_get_drvdata(spi));
244 }
245 
246 static SIMPLE_DEV_PM_OPS(vgg2432a4_pm_ops, vgg2432a4_suspend, vgg2432a4_resume);
247 
248 static struct spi_driver vgg2432a4_driver = {
249 	.driver = {
250 		.name		= "VGG2432A4",
251 		.pm		= &vgg2432a4_pm_ops,
252 	},
253 	.probe		= vgg2432a4_probe,
254 	.remove		= vgg2432a4_remove,
255 	.shutdown	= vgg2432a4_shutdown,
256 };
257 
258 module_spi_driver(vgg2432a4_driver);
259 
260 MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
261 MODULE_DESCRIPTION("VGG2432A4 LCD Driver");
262 MODULE_LICENSE("GPL v2");
263 MODULE_ALIAS("spi:VGG2432A4");
264