1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/init.h>
20#include <linux/gpio.h>
21#include <linux/delay.h>
22
23#include "fbtft.h"
24
25#define DRVNAME "fb_watterott"
26#define WIDTH 320
27#define HEIGHT 240
28#define FPS 5
29#define TXBUFLEN 1024
30#define DEFAULT_BRIGHTNESS 50
31
32#define CMD_VERSION 0x01
33#define CMD_LCD_LED 0x10
34#define CMD_LCD_RESET 0x11
35#define CMD_LCD_ORIENTATION 0x20
36#define CMD_LCD_DRAWIMAGE 0x27
37#define COLOR_RGB323 8
38#define COLOR_RGB332 9
39#define COLOR_RGB233 10
40#define COLOR_RGB565 16
41
42static short mode = 565;
43module_param(mode, short, 0000);
44MODULE_PARM_DESC(mode, "RGB color transfer mode: 332, 565 (default)");
45
46static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
47{
48 va_list args;
49 int i, ret;
50 u8 *buf = par->buf;
51
52 va_start(args, len);
53 for (i = 0; i < len; i++)
54 *buf++ = (u8)va_arg(args, unsigned int);
55 va_end(args);
56
57 fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par,
58 par->info->device, u8, par->buf, len, "%s: ", __func__);
59
60 ret = par->fbtftops.write(par, par->buf, len);
61 if (ret < 0) {
62 dev_err(par->info->device,
63 "write() failed and returned %d\n", ret);
64 return;
65 }
66}
67
68static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
69{
70 unsigned int start_line, end_line;
71 u16 *vmem16 = (u16 *)(par->info->screen_buffer + offset);
72 __be16 *pos = par->txbuf.buf + 1;
73 __be16 *buf16 = par->txbuf.buf + 10;
74 int i, j;
75 int ret = 0;
76
77 start_line = offset / par->info->fix.line_length;
78 end_line = start_line + (len / par->info->fix.line_length) - 1;
79
80
81 ((u8 *)par->txbuf.buf)[0] = CMD_LCD_DRAWIMAGE;
82 pos[0] = 0;
83 pos[2] = cpu_to_be16(par->info->var.xres);
84 pos[3] = cpu_to_be16(1);
85 ((u8 *)par->txbuf.buf)[9] = COLOR_RGB565;
86
87 for (i = start_line; i <= end_line; i++) {
88 pos[1] = cpu_to_be16(i);
89 for (j = 0; j < par->info->var.xres; j++)
90 buf16[j] = cpu_to_be16(*vmem16++);
91 ret = par->fbtftops.write(par,
92 par->txbuf.buf, 10 + par->info->fix.line_length);
93 if (ret < 0)
94 return ret;
95 udelay(300);
96 }
97
98 return 0;
99}
100
101#define RGB565toRGB323(c) (((c&0xE000)>>8) | ((c&0600)>>6) | ((c&0x001C)>>2))
102#define RGB565toRGB332(c) (((c&0xE000)>>8) | ((c&0700)>>6) | ((c&0x0018)>>3))
103#define RGB565toRGB233(c) (((c&0xC000)>>8) | ((c&0700)>>5) | ((c&0x001C)>>2))
104
105static int write_vmem_8bit(struct fbtft_par *par, size_t offset, size_t len)
106{
107 unsigned int start_line, end_line;
108 u16 *vmem16 = (u16 *)(par->info->screen_buffer + offset);
109 __be16 *pos = par->txbuf.buf + 1;
110 u8 *buf8 = par->txbuf.buf + 10;
111 int i, j;
112 int ret = 0;
113
114 start_line = offset / par->info->fix.line_length;
115 end_line = start_line + (len / par->info->fix.line_length) - 1;
116
117
118 ((u8 *)par->txbuf.buf)[0] = CMD_LCD_DRAWIMAGE;
119 pos[0] = 0;
120 pos[2] = cpu_to_be16(par->info->var.xres);
121 pos[3] = cpu_to_be16(1);
122 ((u8 *)par->txbuf.buf)[9] = COLOR_RGB332;
123
124 for (i = start_line; i <= end_line; i++) {
125 pos[1] = cpu_to_be16(i);
126 for (j = 0; j < par->info->var.xres; j++) {
127 buf8[j] = RGB565toRGB332(*vmem16);
128 vmem16++;
129 }
130 ret = par->fbtftops.write(par,
131 par->txbuf.buf, 10 + par->info->var.xres);
132 if (ret < 0)
133 return ret;
134 udelay(700);
135 }
136
137 return 0;
138}
139
140static unsigned int firmware_version(struct fbtft_par *par)
141{
142 u8 rxbuf[4] = {0, };
143
144 write_reg(par, CMD_VERSION);
145 par->fbtftops.read(par, rxbuf, 4);
146 if (rxbuf[1] != '.')
147 return 0;
148
149 return (rxbuf[0] - '0') << 8 | (rxbuf[2] - '0') << 4 | (rxbuf[3] - '0');
150}
151
152static int init_display(struct fbtft_par *par)
153{
154 int ret;
155 unsigned int version;
156 u8 save_mode;
157
158
159 save_mode = par->spi->mode;
160 par->spi->mode |= SPI_CS_HIGH;
161 ret = spi_setup(par->spi);
162 if (ret) {
163 dev_err(par->info->device, "Could not set SPI_CS_HIGH\n");
164 return ret;
165 }
166 write_reg(par, 0x00);
167
168 mdelay(50);
169 par->fbtftops.reset(par);
170 mdelay(1000);
171 par->spi->mode = save_mode;
172 ret = spi_setup(par->spi);
173 if (ret) {
174 dev_err(par->info->device, "Could not restore SPI mode\n");
175 return ret;
176 }
177 write_reg(par, 0x00);
178
179 version = firmware_version(par);
180 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Firmware version: %x.%02x\n",
181 version >> 8, version & 0xFF);
182
183 if (mode == 332)
184 par->fbtftops.write_vmem = write_vmem_8bit;
185 return 0;
186}
187
188static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
189{
190
191}
192
193static int set_var(struct fbtft_par *par)
194{
195 u8 rotate;
196
197
198 switch (par->info->var.rotate) {
199 case 90:
200 rotate = 27;
201 break;
202 case 180:
203 rotate = 18;
204 break;
205 case 270:
206 rotate = 9;
207 break;
208 default:
209 rotate = 0;
210 }
211 write_reg(par, CMD_LCD_ORIENTATION, rotate);
212
213 return 0;
214}
215
216static int verify_gpios(struct fbtft_par *par)
217{
218 if (par->gpio.reset < 0) {
219 dev_err(par->info->device, "Missing 'reset' gpio. Aborting.\n");
220 return -EINVAL;
221 }
222 return 0;
223}
224
225#ifdef CONFIG_FB_BACKLIGHT
226static int backlight_chip_update_status(struct backlight_device *bd)
227{
228 struct fbtft_par *par = bl_get_data(bd);
229 int brightness = bd->props.brightness;
230
231 fbtft_par_dbg(DEBUG_BACKLIGHT, par,
232 "%s: brightness=%d, power=%d, fb_blank=%d\n",
233 __func__, bd->props.brightness, bd->props.power,
234 bd->props.fb_blank);
235
236 if (bd->props.power != FB_BLANK_UNBLANK)
237 brightness = 0;
238
239 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
240 brightness = 0;
241
242 write_reg(par, CMD_LCD_LED, brightness);
243
244 return 0;
245}
246
247static const struct backlight_ops bl_ops = {
248 .update_status = backlight_chip_update_status,
249};
250
251static void register_chip_backlight(struct fbtft_par *par)
252{
253 struct backlight_device *bd;
254 struct backlight_properties bl_props = { 0, };
255
256 bl_props.type = BACKLIGHT_RAW;
257 bl_props.power = FB_BLANK_POWERDOWN;
258 bl_props.max_brightness = 100;
259 bl_props.brightness = DEFAULT_BRIGHTNESS;
260
261 bd = backlight_device_register(dev_driver_string(par->info->device),
262 par->info->device, par, &bl_ops, &bl_props);
263 if (IS_ERR(bd)) {
264 dev_err(par->info->device,
265 "cannot register backlight device (%ld)\n",
266 PTR_ERR(bd));
267 return;
268 }
269 par->info->bl_dev = bd;
270
271 if (!par->fbtftops.unregister_backlight)
272 par->fbtftops.unregister_backlight = fbtft_unregister_backlight;
273}
274#else
275#define register_chip_backlight NULL
276#endif
277
278static struct fbtft_display display = {
279 .regwidth = 8,
280 .buswidth = 8,
281 .width = WIDTH,
282 .height = HEIGHT,
283 .fps = FPS,
284 .txbuflen = TXBUFLEN,
285 .fbtftops = {
286 .write_register = write_reg8_bus8,
287 .write_vmem = write_vmem,
288 .init_display = init_display,
289 .set_addr_win = set_addr_win,
290 .set_var = set_var,
291 .verify_gpios = verify_gpios,
292 .register_backlight = register_chip_backlight,
293 },
294};
295
296FBTFT_REGISTER_DRIVER(DRVNAME, "watterott,openlcd", &display);
297
298MODULE_ALIAS("spi:" DRVNAME);
299
300MODULE_DESCRIPTION("FB driver for the Watterott LCD Controller");
301MODULE_AUTHOR("Noralf Tronnes");
302MODULE_LICENSE("GPL");
303
