1 /* Linux kernel driver for the tpo JBT6K74-AS LCM ASIC
3 * Copyright (C) 2006-2007 by Openmoko, Inc.
4 * Author: Harald Welte <laforge@openmoko.org>,
5 * Stefan Schmidt <stefan@openmoko.org>
6 * Copyright (C) 2008 by Harald Welte <laforge@openmoko.org>
7 * Copyright (C) 2009 by Lars-Peter Clausen <lars@metafoo.de>
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
27 #include <linux/kernel.h>
28 #include <linux/types.h>
29 #include <linux/module.h>
30 #include <linux/device.h>
31 #include <linux/platform_device.h>
32 #include <linux/delay.h>
33 #include <linux/workqueue.h>
34 #include <linux/jbt6k74.h>
36 #include <linux/lcd.h>
37 #include <linux/time.h>
40 JBT_REG_SLEEP_IN = 0x10,
41 JBT_REG_SLEEP_OUT = 0x11,
43 JBT_REG_DISPLAY_OFF = 0x28,
44 JBT_REG_DISPLAY_ON = 0x29,
46 JBT_REG_RGB_FORMAT = 0x3a,
47 JBT_REG_QUAD_RATE = 0x3b,
49 JBT_REG_POWER_ON_OFF = 0xb0,
50 JBT_REG_BOOSTER_OP = 0xb1,
51 JBT_REG_BOOSTER_MODE = 0xb2,
52 JBT_REG_BOOSTER_FREQ = 0xb3,
53 JBT_REG_OPAMP_SYSCLK = 0xb4,
54 JBT_REG_VSC_VOLTAGE = 0xb5,
55 JBT_REG_VCOM_VOLTAGE = 0xb6,
56 JBT_REG_EXT_DISPL = 0xb7,
57 JBT_REG_OUTPUT_CONTROL = 0xb8,
58 JBT_REG_DCCLK_DCEV = 0xb9,
59 JBT_REG_DISPLAY_MODE1 = 0xba,
60 JBT_REG_DISPLAY_MODE2 = 0xbb,
61 JBT_REG_DISPLAY_MODE = 0xbc,
62 JBT_REG_ASW_SLEW = 0xbd,
63 JBT_REG_DUMMY_DISPLAY = 0xbe,
64 JBT_REG_DRIVE_SYSTEM = 0xbf,
66 JBT_REG_SLEEP_OUT_FR_A = 0xc0,
67 JBT_REG_SLEEP_OUT_FR_B = 0xc1,
68 JBT_REG_SLEEP_OUT_FR_C = 0xc2,
69 JBT_REG_SLEEP_IN_LCCNT_D = 0xc3,
70 JBT_REG_SLEEP_IN_LCCNT_E = 0xc4,
71 JBT_REG_SLEEP_IN_LCCNT_F = 0xc5,
72 JBT_REG_SLEEP_IN_LCCNT_G = 0xc6,
74 JBT_REG_GAMMA1_FINE_1 = 0xc7,
75 JBT_REG_GAMMA1_FINE_2 = 0xc8,
76 JBT_REG_GAMMA1_INCLINATION = 0xc9,
77 JBT_REG_GAMMA1_BLUE_OFFSET = 0xca,
80 JBT_REG_BLANK_CONTROL = 0xcf,
81 JBT_REG_BLANK_TH_TV = 0xd0,
82 JBT_REG_CKV_ON_OFF = 0xd1,
83 JBT_REG_CKV_1_2 = 0xd2,
84 JBT_REG_OEV_TIMING = 0xd3,
85 JBT_REG_ASW_TIMING_1 = 0xd4,
86 JBT_REG_ASW_TIMING_2 = 0xd5,
89 JBT_REG_BLANK_CONTROL_QVGA = 0xd6,
90 JBT_REG_BLANK_TH_TV_QVGA = 0xd7,
91 JBT_REG_CKV_ON_OFF_QVGA = 0xd8,
92 JBT_REG_CKV_1_2_QVGA = 0xd9,
93 JBT_REG_OEV_TIMING_QVGA = 0xde,
94 JBT_REG_ASW_TIMING_1_QVGA = 0xdf,
95 JBT_REG_ASW_TIMING_2_QVGA = 0xe0,
98 JBT_REG_HCLOCK_VGA = 0xec,
99 JBT_REG_HCLOCK_QVGA = 0xed,
103 enum jbt_resolution {
108 enum jbt_power_mode {
109 JBT_POWER_MODE_DEEP_STANDBY,
110 JBT_POWER_MODE_SLEEP,
111 JBT_POWER_MODE_NORMAL,
114 static const char *jbt_power_mode_names[] = {
115 [JBT_POWER_MODE_DEEP_STANDBY] = "deep-standby",
116 [JBT_POWER_MODE_SLEEP] = "sleep",
117 [JBT_POWER_MODE_NORMAL] = "normal",
120 static const char *jbt_resolution_names[] = {
121 [JBT_RESOLUTION_VGA] = "vga",
122 [JBT_RESOLUTION_QVGA] = "qvga",
126 struct mutex lock; /* protects this structure */
127 enum jbt_resolution resolution;
128 enum jbt_power_mode power_mode;
129 enum jbt_power_mode suspend_mode;
131 struct spi_device *spi_dev;
132 struct lcd_device *lcd_dev;
133 unsigned long last_sleep;
134 struct delayed_work blank_work;
140 #define JBT_COMMAND 0x000
141 #define JBT_DATA 0x100
143 static int jbt_reg_write_nodata(struct jbt_info *jbt, u8 reg)
147 jbt->tx_buf[0] = JBT_COMMAND | reg;
148 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
151 jbt->reg_cache[reg] = 0;
153 dev_err(&jbt->spi_dev->dev, "jbt_reg_write_nodata spi_write ret %d\n",
160 static int jbt_reg_write(struct jbt_info *jbt, u8 reg, u8 data)
164 jbt->tx_buf[0] = JBT_COMMAND | reg;
165 jbt->tx_buf[1] = JBT_DATA | data;
166 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
169 jbt->reg_cache[reg] = data;
171 dev_err(&jbt->spi_dev->dev, "jbt_reg_write spi_write ret %d\n", rc);
176 static int jbt_reg_write16(struct jbt_info *jbt, u8 reg, u16 data)
180 jbt->tx_buf[0] = JBT_COMMAND | reg;
181 jbt->tx_buf[1] = JBT_DATA | (data >> 8);
182 jbt->tx_buf[2] = JBT_DATA | (data & 0xff);
184 rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
187 jbt->reg_cache[reg] = data;
189 dev_err(&jbt->spi_dev->dev, "jbt_reg_write16 spi_write ret %d\n", rc);
194 static int jbt_init_regs(struct jbt_info *jbt)
198 dev_dbg(&jbt->spi_dev->dev, "entering %cVGA mode\n",
199 jbt->resolution == JBT_RESOLUTION_QVGA ? 'Q' : ' ');
201 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01);
202 rc |= jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00);
203 rc |= jbt_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60);
204 rc |= jbt_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10);
205 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56);
206 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33);
207 rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11);
208 rc |= jbt_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02);
209 rc |= jbt_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b);
210 rc |= jbt_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40);
211 rc |= jbt_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03);
212 rc |= jbt_reg_write(jbt, JBT_REG_DCCLK_DCEV, 0x04);
214 * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
215 * to avoid red / blue flicker
217 rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04 | (1 << 5));
218 rc |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00);
220 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11);
221 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11);
222 rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11);
223 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040);
224 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0);
225 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020);
226 rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0);
228 rc |= jbt_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533);
229 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00);
230 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00);
231 rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00);
233 if (jbt->resolution != JBT_RESOLUTION_QVGA) {
234 rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0);
235 rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02);
236 rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804);
238 rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01);
239 rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000);
241 rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e);
242 rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4);
243 rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e);
245 rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff);
246 rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02);
247 rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804);
249 rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01);
250 rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008);
252 rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a);
253 rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19);
254 rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a);
257 return rc ? -EIO : 0;
260 static int standby_to_sleep(struct jbt_info *jbt)
264 /* three times command zero */
265 rc = jbt_reg_write_nodata(jbt, 0x00);
267 rc |= jbt_reg_write_nodata(jbt, 0x00);
269 rc |= jbt_reg_write_nodata(jbt, 0x00);
272 /* deep standby out */
273 rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x11);
275 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x28);
277 /* (re)initialize register set */
278 rc |= jbt_init_regs(jbt);
280 return rc ? -EIO : 0;
283 static int sleep_to_normal(struct jbt_info *jbt)
287 /* Make sure we are 120 ms after SLEEP_OUT */
288 if (time_before(jiffies, jbt->last_sleep))
289 mdelay(jiffies_to_msecs(jbt->last_sleep - jiffies));
291 if (jbt->resolution == JBT_RESOLUTION_VGA) {
292 /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
293 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80);
296 rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00);
298 /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
299 rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81);
302 rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22);
305 /* AVDD on, XVDD on */
306 rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16);
309 rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xfff9);
311 /* Turn on display */
312 rc |= jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
315 rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT);
316 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
318 /* Allow the booster and display controller to restart stably */
321 return rc ? -EIO : 0;
324 static int normal_to_sleep(struct jbt_info *jbt)
328 /* Make sure we are 120 ms after SLEEP_OUT */
329 while (time_before(jiffies, jbt->last_sleep))
332 rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
333 rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8000 | 1 << 3);
334 rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
335 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
337 /* Allow the internal circuits to stop automatically */
340 return rc ? -EIO : 0;
343 static int sleep_to_standby(struct jbt_info *jbt)
345 return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
348 int jbt6k74_enter_power_mode(struct jbt_info *jbt, enum jbt_power_mode new_mode)
350 struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data;
353 dev_dbg(&jbt->spi_dev->dev, "entering (old_state=%s, new_state=%s)\n",
354 jbt_power_mode_names[jbt->power_mode],
355 jbt_power_mode_names[new_mode]);
357 mutex_lock(&jbt->lock);
359 if (jbt->suspended) {
361 case JBT_POWER_MODE_DEEP_STANDBY:
362 case JBT_POWER_MODE_SLEEP:
363 case JBT_POWER_MODE_NORMAL:
365 jbt->suspend_mode = new_mode;
370 } else if (new_mode == JBT_POWER_MODE_NORMAL &&
371 pdata->enable_pixel_clock) {
372 pdata->enable_pixel_clock(&jbt->spi_dev->dev, 1);
375 switch (jbt->power_mode) {
376 case JBT_POWER_MODE_DEEP_STANDBY:
378 case JBT_POWER_MODE_DEEP_STANDBY:
381 case JBT_POWER_MODE_SLEEP:
382 rc = standby_to_sleep(jbt);
384 case JBT_POWER_MODE_NORMAL:
385 /* first transition into sleep */
386 rc = standby_to_sleep(jbt);
387 /* then transition into normal */
388 rc |= sleep_to_normal(jbt);
392 case JBT_POWER_MODE_SLEEP:
394 case JBT_POWER_MODE_SLEEP:
397 case JBT_POWER_MODE_DEEP_STANDBY:
398 rc = sleep_to_standby(jbt);
400 case JBT_POWER_MODE_NORMAL:
401 rc = sleep_to_normal(jbt);
405 case JBT_POWER_MODE_NORMAL:
407 case JBT_POWER_MODE_NORMAL:
410 case JBT_POWER_MODE_DEEP_STANDBY:
411 /* first transition into sleep */
412 rc = normal_to_sleep(jbt);
413 /* then transition into deep standby */
414 rc |= sleep_to_standby(jbt);
416 case JBT_POWER_MODE_SLEEP:
417 rc = normal_to_sleep(jbt);
423 jbt->power_mode = new_mode;
424 if (new_mode != JBT_POWER_MODE_NORMAL &&
425 pdata->enable_pixel_clock)
426 pdata->enable_pixel_clock(&jbt->spi_dev->dev, 0);
428 dev_err(&jbt->spi_dev->dev, "Failed enter state '%s')\n",
429 jbt_power_mode_names[new_mode]);
432 mutex_unlock(&jbt->lock);
436 EXPORT_SYMBOL_GPL(jbt6k74_enter_power_mode);
438 int jbt6k74_set_resolution(struct jbt_info *jbt, enum jbt_resolution new_resolution) {
440 enum jbt_resolution old_resolution;
442 if (new_resolution != JBT_RESOLUTION_VGA &&
443 new_resolution != JBT_RESOLUTION_QVGA)
446 mutex_lock(&jbt->lock);
448 if (jbt->resolution == new_resolution)
451 old_resolution = jbt->resolution;
452 jbt->resolution = new_resolution;
454 if (jbt->power_mode == JBT_POWER_MODE_NORMAL) {
456 /* first transition into sleep */
457 rc = normal_to_sleep(jbt);
458 /* second transition into deep standby */
459 /* rc |= sleep_to_standby(jbt);*/
460 /* third transition into sleep */
461 /* rc |= standby_to_sleep(jbt);*/
462 /* fourth transition into normal */
463 rc |= sleep_to_normal(jbt);
466 jbt->resolution = old_resolution;
467 dev_err(&jbt->spi_dev->dev, "Failed to set resolution '%s')\n",
468 jbt_resolution_names[new_resolution]);
473 mutex_unlock(&jbt->lock);
477 EXPORT_SYMBOL_GPL(jbt6k74_set_resolution);
479 static ssize_t resolution_read(struct device *dev, struct device_attribute *attr,
482 struct jbt_info *jbt = dev_get_drvdata(dev);
484 if (jbt->resolution >= ARRAY_SIZE(jbt_resolution_names))
487 return sprintf(buf, "%s\n", jbt_resolution_names[jbt->resolution]);
490 static ssize_t resolution_write(struct device *dev, struct device_attribute *attr,
491 const char *buf, size_t count)
493 struct jbt_info *jbt = dev_get_drvdata(dev);
496 for (i = 0; i < ARRAY_SIZE(jbt_resolution_names); i++) {
497 if (!strncmp(buf, jbt_resolution_names[i],
498 strlen(jbt_resolution_names[i]))) {
499 rc = jbt6k74_set_resolution(jbt, i);
509 static DEVICE_ATTR(resolution, 0644, resolution_read, resolution_write);
511 static int reg_by_string(const char *name)
513 if (!strcmp(name, "gamma_fine1"))
514 return JBT_REG_GAMMA1_FINE_1;
515 else if (!strcmp(name, "gamma_fine2"))
516 return JBT_REG_GAMMA1_FINE_2;
517 else if (!strcmp(name, "gamma_inclination"))
518 return JBT_REG_GAMMA1_INCLINATION;
520 return JBT_REG_GAMMA1_BLUE_OFFSET;
523 static ssize_t gamma_read(struct device *dev, struct device_attribute *attr,
526 struct jbt_info *jbt = dev_get_drvdata(dev);
527 int reg = reg_by_string(attr->attr.name);
530 mutex_lock(&jbt->lock);
531 val = jbt->reg_cache[reg];
532 mutex_unlock(&jbt->lock);
534 return sprintf(buf, "0x%04x\n", val);
537 static ssize_t gamma_write(struct device *dev, struct device_attribute *attr,
538 const char *buf, size_t count)
540 struct jbt_info *jbt = dev_get_drvdata(dev);
541 int reg = reg_by_string(attr->attr.name);
542 unsigned long val = simple_strtoul(buf, NULL, 10);
544 dev_info(dev, "writing gama %lu\n", val & 0xff);
546 mutex_lock(&jbt->lock);
547 jbt_reg_write(jbt, reg, val & 0xff);
548 mutex_unlock(&jbt->lock);
553 static ssize_t reset_write(struct device *dev, struct device_attribute *attr,
554 const char *buf, size_t count)
557 struct jbt_info *jbt = dev_get_drvdata(dev);
558 struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data;
560 dev_info(dev, "reset\n");
562 mutex_lock(&jbt->lock);
564 /* hard reset the jbt6k74 */
565 (pdata->reset)(0, 0);
567 (pdata->reset)(0, 1);
570 rc = jbt_reg_write_nodata(jbt, 0x01);
572 dev_err(&jbt->spi_dev->dev, "cannot soft reset\n");
575 mutex_unlock(&jbt->lock);
577 jbt6k74_enter_power_mode(jbt, jbt->power_mode);
582 static DEVICE_ATTR(gamma_fine1, 0644, gamma_read, gamma_write);
583 static DEVICE_ATTR(gamma_fine2, 0644, gamma_read, gamma_write);
584 static DEVICE_ATTR(gamma_inclination, 0644, gamma_read, gamma_write);
585 static DEVICE_ATTR(gamma_blue_offset, 0644, gamma_read, gamma_write);
586 static DEVICE_ATTR(reset, 0600, NULL, reset_write);
588 static struct attribute *jbt_sysfs_entries[] = {
589 &dev_attr_resolution.attr,
590 &dev_attr_gamma_fine1.attr,
591 &dev_attr_gamma_fine2.attr,
592 &dev_attr_gamma_inclination.attr,
593 &dev_attr_gamma_blue_offset.attr,
594 &dev_attr_reset.attr,
598 static struct attribute_group jbt_attr_group = {
600 .attrs = jbt_sysfs_entries,
603 /* FIXME: This in an ugly hack to delay display blanking.
604 When the jbt is in sleep mode it displays an all white screen and thus one
605 will a see a short flash.
606 By delaying the blanking we will give the backlight a chance to turn off and
607 thus avoid getting the flash */
608 static void jbt_blank_worker(struct work_struct *work) {
609 struct jbt_info *jbt = container_of(work, struct jbt_info,
612 switch (jbt->blank_mode) {
613 case FB_BLANK_NORMAL:
614 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
616 case FB_BLANK_POWERDOWN:
617 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
624 static int jbt6k74_set_mode(struct lcd_device *ld, struct fb_videomode *m) {
626 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
628 if (m->xres == 240 && m->yres == 320) {
629 rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_QVGA);
630 } else if (m->xres == 480 && m->yres == 640) {
631 rc = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_VGA);
633 dev_err(&jbt->spi_dev->dev, "Unknown resolution. Entering sleep mode.\n");
634 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
640 static int jbt6k74_set_power(struct lcd_device *ld, int power) {
642 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
644 jbt->blank_mode = power;
645 cancel_rearming_delayed_work(&jbt->blank_work);
648 case FB_BLANK_UNBLANK:
649 dev_dbg(&jbt->spi_dev->dev, "unblank\n");
650 rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
652 case FB_BLANK_NORMAL:
653 dev_dbg(&jbt->spi_dev->dev, "blank\n");
654 rc = schedule_delayed_work(&jbt->blank_work, HZ);
656 case FB_BLANK_POWERDOWN:
657 dev_dbg(&jbt->spi_dev->dev, "powerdown\n");
658 rc = schedule_delayed_work(&jbt->blank_work, HZ);
667 static int jbt6k74_get_power(struct lcd_device *ld) {
668 struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
670 switch (jbt->power_mode) {
671 case JBT_POWER_MODE_NORMAL:
672 return FB_BLANK_UNBLANK;
673 case JBT_POWER_MODE_SLEEP:
674 return FB_BLANK_NORMAL;
676 return JBT_POWER_MODE_DEEP_STANDBY;
680 struct lcd_ops jbt6k74_lcd_ops = {
681 .set_power = jbt6k74_set_power,
682 .get_power = jbt6k74_get_power,
683 .set_mode = jbt6k74_set_mode,
686 /* linux device model infrastructure */
688 static int __devinit jbt_probe(struct spi_device *spi)
691 struct jbt_info *jbt;
692 struct jbt6k74_platform_data *pdata = spi->dev.platform_data;
694 /* the controller doesn't have a MISO pin; we can't do detection */
696 spi->mode = SPI_CPOL | SPI_CPHA;
697 spi->bits_per_word = 9;
702 "error during spi_setup of jbt6k74 driver\n");
706 jbt = kzalloc(sizeof(*jbt), GFP_KERNEL);
712 jbt->lcd_dev = lcd_device_register("jbt6k74-lcd", &spi->dev,
713 jbt, &jbt6k74_lcd_ops);
715 if (IS_ERR(jbt->lcd_dev)) {
716 rc = PTR_ERR(jbt->lcd_dev);
717 goto err_free_drvdata;
720 INIT_DELAYED_WORK(&jbt->blank_work, jbt_blank_worker);
722 jbt->resolution = JBT_RESOLUTION_VGA;
723 jbt->power_mode = JBT_POWER_MODE_DEEP_STANDBY;
724 jbt->last_sleep = jiffies + msecs_to_jiffies(120);
725 mutex_init(&jbt->lock);
727 dev_set_drvdata(&spi->dev, jbt);
729 rc = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
731 dev_err(&spi->dev, "cannot enter NORMAL state\n");
732 goto err_unregister_lcd;
735 rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
737 dev_err(&spi->dev, "cannot create sysfs group\n");
741 if (pdata->probe_completed)
742 (pdata->probe_completed)(&spi->dev);
747 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
749 lcd_device_unregister(jbt->lcd_dev);
751 dev_set_drvdata(&spi->dev, NULL);
757 static int __devexit jbt_remove(struct spi_device *spi)
759 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
761 /* We don't want to switch off the display in case the user
762 * accidentially unloads the module (whose use count normally is 0) */
763 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
765 sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
766 dev_set_drvdata(&spi->dev, NULL);
768 lcd_device_unregister(jbt->lcd_dev);
776 static int jbt_suspend(struct spi_device *spi, pm_message_t state)
778 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
780 jbt->suspend_mode = jbt->power_mode;
782 jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
785 dev_info(&spi->dev, "suspended\n");
790 int jbt6k74_resume(struct spi_device *spi)
792 struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
795 jbt6k74_enter_power_mode(jbt, jbt->suspend_mode);
797 dev_info(&spi->dev, "resumed\n");
801 EXPORT_SYMBOL_GPL(jbt6k74_resume);
804 #define jbt_suspend NULL
805 #define jbt6k74_resume NULL
808 static struct spi_driver jbt6k74_driver = {
811 .owner = THIS_MODULE,
815 .remove = __devexit_p(jbt_remove),
816 .suspend = jbt_suspend,
817 .resume = jbt6k74_resume,
820 static int __init jbt_init(void)
822 return spi_register_driver(&jbt6k74_driver);
825 static void __exit jbt_exit(void)
827 spi_unregister_driver(&jbt6k74_driver);
830 MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface");
831 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
832 MODULE_LICENSE("GPL");
834 module_init(jbt_init);
835 module_exit(jbt_exit);