1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
/*
* am300epd.c -- Platform device for AM300 EPD kit
*
* Copyright (C) 2008, Jaya Kumar
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
* This work was made possible by help and equipment support from E-Ink
* Corporation. http://support.eink.com/community
*
* This driver is written to be used with the Broadsheet display controller.
* on the AM300 EPD prototype kit/development kit with an E-Ink 800x600
* Vizplex EPD on a Gumstix board using the Broadsheet interface board.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/gumstix.h>
#include <mach/mfp-pxa25x.h>
#include <mach/pxafb.h>
#include "generic.h"
#include <video/broadsheetfb.h>
static unsigned int panel_type = 6;
static struct platform_device *am300_device;
static struct broadsheet_board am300_board;
static unsigned long am300_pin_config[] __initdata = {
GPIO16_GPIO,
GPIO17_GPIO,
GPIO32_GPIO,
GPIO48_GPIO,
GPIO49_GPIO,
GPIO51_GPIO,
GPIO74_GPIO,
GPIO75_GPIO,
GPIO76_GPIO,
GPIO77_GPIO,
/* this is the 16-bit hdb bus 58-73 */
GPIO58_GPIO,
GPIO59_GPIO,
GPIO60_GPIO,
GPIO61_GPIO,
GPIO62_GPIO,
GPIO63_GPIO,
GPIO64_GPIO,
GPIO65_GPIO,
GPIO66_GPIO,
GPIO67_GPIO,
GPIO68_GPIO,
GPIO69_GPIO,
GPIO70_GPIO,
GPIO71_GPIO,
GPIO72_GPIO,
GPIO73_GPIO,
};
/* register offsets for gpio control */
#define PWR_GPIO_PIN 16
#define CFG_GPIO_PIN 17
#define RDY_GPIO_PIN 32
#define DC_GPIO_PIN 48
#define RST_GPIO_PIN 49
#define LED_GPIO_PIN 51
#define RD_GPIO_PIN 74
#define WR_GPIO_PIN 75
#define CS_GPIO_PIN 76
#define IRQ_GPIO_PIN 77
/* hdb bus */
#define DB0_GPIO_PIN 58
#define DB15_GPIO_PIN 73
static int gpios[] = { PWR_GPIO_PIN, CFG_GPIO_PIN, RDY_GPIO_PIN, DC_GPIO_PIN,
RST_GPIO_PIN, RD_GPIO_PIN, WR_GPIO_PIN, CS_GPIO_PIN,
IRQ_GPIO_PIN, LED_GPIO_PIN };
static char *gpio_names[] = { "PWR", "CFG", "RDY", "DC", "RST", "RD", "WR",
"CS", "IRQ", "LED" };
static int am300_wait_event(struct broadsheetfb_par *par)
{
/* todo: improve err recovery */
wait_event(par->waitq, gpio_get_value(RDY_GPIO_PIN));
return 0;
}
static int am300_init_gpio_regs(struct broadsheetfb_par *par)
{
int i;
int err;
char dbname[8];
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
err = gpio_request(gpios[i], gpio_names[i]);
if (err) {
dev_err(&am300_device->dev, "failed requesting "
"gpio %s, err=%d\n", gpio_names[i], err);
goto err_req_gpio;
}
}
/* we also need to take care of the hdb bus */
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++) {
sprintf(dbname, "DB%d", i);
err = gpio_request(i, dbname);
if (err) {
dev_err(&am300_device->dev, "failed requesting "
"gpio %d, err=%d\n", i, err);
goto err_req_gpio2;
}
}
/* setup the outputs and init values */
gpio_direction_output(PWR_GPIO_PIN, 0);
gpio_direction_output(CFG_GPIO_PIN, 1);
gpio_direction_output(DC_GPIO_PIN, 0);
gpio_direction_output(RD_GPIO_PIN, 1);
gpio_direction_output(WR_GPIO_PIN, 1);
gpio_direction_output(CS_GPIO_PIN, 1);
gpio_direction_output(RST_GPIO_PIN, 0);
/* setup the inputs */
gpio_direction_input(RDY_GPIO_PIN);
gpio_direction_input(IRQ_GPIO_PIN);
/* start the hdb bus as an input */
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
gpio_direction_output(i, 0);
/* go into command mode */
gpio_set_value(CFG_GPIO_PIN, 1);
gpio_set_value(RST_GPIO_PIN, 0);
msleep(10);
gpio_set_value(RST_GPIO_PIN, 1);
msleep(10);
am300_wait_event(par);
return 0;
err_req_gpio2:
while (--i >= DB0_GPIO_PIN)
gpio_free(i);
i = ARRAY_SIZE(gpios);
err_req_gpio:
while (--i >= 0)
gpio_free(gpios[i]);
return err;
}
static int am300_init_board(struct broadsheetfb_par *par)
{
return am300_init_gpio_regs(par);
}
static void am300_cleanup(struct broadsheetfb_par *par)
{
int i;
free_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), par);
for (i = 0; i < ARRAY_SIZE(gpios); i++)
gpio_free(gpios[i]);
for (i = DB0_GPIO_PIN; i <= DB15_GPIO_PIN; i++)
gpio_free(i);
}
static u16 am300_get_hdb(struct broadsheetfb_par *par)
{
u16 res = 0;
int i;
for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
res |= (gpio_get_value(DB0_GPIO_PIN + i)) ? (1 << i) : 0;
return res;
}
static void am300_set_hdb(struct broadsheetfb_par *par, u16 data)
{
int i;
for (i = 0; i <= (DB15_GPIO_PIN - DB0_GPIO_PIN) ; i++)
gpio_set_value(DB0_GPIO_PIN + i, (data >> i) & 0x01);
}
static void am300_set_ctl(struct broadsheetfb_par *par, unsigned char bit,
u8 state)
{
switch (bit) {
case BS_CS:
gpio_set_value(CS_GPIO_PIN, state);
break;
case BS_DC:
gpio_set_value(DC_GPIO_PIN, state);
break;
case BS_WR:
gpio_set_value(WR_GPIO_PIN, state);
break;
}
}
static int am300_get_panel_type(void)
{
return panel_type;
}
static irqreturn_t am300_handle_irq(int irq, void *dev_id)
{
struct broadsheetfb_par *par = dev_id;
wake_up(&par->waitq);
return IRQ_HANDLED;
}
static int am300_setup_irq(struct fb_info *info)
{
int ret;
struct broadsheetfb_par *par = info->par;
ret = request_irq(PXA_GPIO_TO_IRQ(RDY_GPIO_PIN), am300_handle_irq,
IRQF_DISABLED|IRQF_TRIGGER_RISING,
"AM300", par);
if (ret)
dev_err(&am300_device->dev, "request_irq failed: %d\n", ret);
return ret;
}
static struct broadsheet_board am300_board = {
.owner = THIS_MODULE,
.init = am300_init_board,
.cleanup = am300_cleanup,
.set_hdb = am300_set_hdb,
.get_hdb = am300_get_hdb,
.set_ctl = am300_set_ctl,
.wait_for_rdy = am300_wait_event,
.get_panel_type = am300_get_panel_type,
.setup_irq = am300_setup_irq,
};
int __init am300_init(void)
{
int ret;
pxa2xx_mfp_config(ARRAY_AND_SIZE(am300_pin_config));
/* request our platform independent driver */
request_module("broadsheetfb");
am300_device = platform_device_alloc("broadsheetfb", -1);
if (!am300_device)
return -ENOMEM;
/* the am300_board that will be seen by broadsheetfb is a copy */
platform_device_add_data(am300_device, &am300_board,
sizeof(am300_board));
ret = platform_device_add(am300_device);
if (ret) {
platform_device_put(am300_device);
return ret;
}
return 0;
}
module_param(panel_type, uint, 0);
MODULE_PARM_DESC(panel_type, "Select the panel type: 37, 6, 97");
MODULE_DESCRIPTION("board driver for am300 epd kit");
MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
|
