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path: root/drivers/video/backlight
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-rw-r--r--drivers/video/backlight/Kconfig14
-rw-r--r--drivers/video/backlight/Makefile1
-rw-r--r--drivers/video/backlight/jbt6k74.c896
3 files changed, 911 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index c025c84601b..88db009f3b3 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -107,6 +107,20 @@ config LCD_HP700
If you have an HP Jornada 700 series handheld (710/720/728)
say Y to enable LCD control driver.
+config LCD_JBT6K74
+ tristate "TPO JBT6K74-AS TFT display ASIC control interface"
+ depends on SPI_MASTER && SYSFS && LCD_CLASS_DEVICE
+ help
+ SPI driver for the control interface of TFT panels containing
+ the TPO JBT6K74-AS controller ASIC, such as the TPO TD028TTEC1
+ TFT diplay module used in the Openmoko Freerunner GSM phone.
+
+ The control interface is required for display operation, as it
+ controls power management, display timing and gamma calibration.
+
+ This driver can also be build as a module, if so it will be called
+ jbt6k74.
+
#
# Backlight
#
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 09d1f14d625..54c2cdac583 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
obj-$(CONFIG_LCD_VGG2432A4) += vgg2432a4.o
obj-$(CONFIG_LCD_TDO24M) += tdo24m.o
obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
+obj-$(CONFIG_LCD_JBT6K74) += jbt6k74.o
obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
diff --git a/drivers/video/backlight/jbt6k74.c b/drivers/video/backlight/jbt6k74.c
new file mode 100644
index 00000000000..8450904d585
--- /dev/null
+++ b/drivers/video/backlight/jbt6k74.c
@@ -0,0 +1,896 @@
+/* Linux kernel driver for the tpo JBT6K74-AS LCM ASIC
+ *
+ * Copyright (C) 2006-2007 by Openmoko, Inc.
+ * Author: Harald Welte <laforge@openmoko.org>,
+ * Stefan Schmidt <stefan@openmoko.org>
+ * Copyright (C) 2008 by Harald Welte <laforge@openmoko.org>
+ * Copyright (C) 2009 by Lars-Peter Clausen <lars@metafoo.de>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/jbt6k74.h>
+#include <linux/fb.h>
+#include <linux/lcd.h>
+#include <linux/time.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
+
+enum jbt_register {
+ JBT_REG_SLEEP_IN = 0x10,
+ JBT_REG_SLEEP_OUT = 0x11,
+
+ JBT_REG_DISPLAY_OFF = 0x28,
+ JBT_REG_DISPLAY_ON = 0x29,
+
+ JBT_REG_RGB_FORMAT = 0x3a,
+ JBT_REG_QUAD_RATE = 0x3b,
+
+ JBT_REG_POWER_ON_OFF = 0xb0,
+ JBT_REG_BOOSTER_OP = 0xb1,
+ JBT_REG_BOOSTER_MODE = 0xb2,
+ JBT_REG_BOOSTER_FREQ = 0xb3,
+ JBT_REG_OPAMP_SYSCLK = 0xb4,
+ JBT_REG_VSC_VOLTAGE = 0xb5,
+ JBT_REG_VCOM_VOLTAGE = 0xb6,
+ JBT_REG_EXT_DISPL = 0xb7,
+ JBT_REG_OUTPUT_CONTROL = 0xb8,
+ JBT_REG_DCCLK_DCEV = 0xb9,
+ JBT_REG_DISPLAY_MODE1 = 0xba,
+ JBT_REG_DISPLAY_MODE2 = 0xbb,
+ JBT_REG_DISPLAY_MODE = 0xbc,
+ JBT_REG_ASW_SLEW = 0xbd,
+ JBT_REG_DUMMY_DISPLAY = 0xbe,
+ JBT_REG_DRIVE_SYSTEM = 0xbf,
+
+ JBT_REG_SLEEP_OUT_FR_A = 0xc0,
+ JBT_REG_SLEEP_OUT_FR_B = 0xc1,
+ JBT_REG_SLEEP_OUT_FR_C = 0xc2,
+ JBT_REG_SLEEP_IN_LCCNT_D = 0xc3,
+ JBT_REG_SLEEP_IN_LCCNT_E = 0xc4,
+ JBT_REG_SLEEP_IN_LCCNT_F = 0xc5,
+ JBT_REG_SLEEP_IN_LCCNT_G = 0xc6,
+
+ JBT_REG_GAMMA1_FINE_1 = 0xc7,
+ JBT_REG_GAMMA1_FINE_2 = 0xc8,
+ JBT_REG_GAMMA1_INCLINATION = 0xc9,
+ JBT_REG_GAMMA1_BLUE_OFFSET = 0xca,
+
+ /* VGA */
+ JBT_REG_BLANK_CONTROL = 0xcf,
+ JBT_REG_BLANK_TH_TV = 0xd0,
+ JBT_REG_CKV_ON_OFF = 0xd1,
+ JBT_REG_CKV_1_2 = 0xd2,
+ JBT_REG_OEV_TIMING = 0xd3,
+ JBT_REG_ASW_TIMING_1 = 0xd4,
+ JBT_REG_ASW_TIMING_2 = 0xd5,
+
+ /* QVGA */
+ JBT_REG_BLANK_CONTROL_QVGA = 0xd6,
+ JBT_REG_BLANK_TH_TV_QVGA = 0xd7,
+ JBT_REG_CKV_ON_OFF_QVGA = 0xd8,
+ JBT_REG_CKV_1_2_QVGA = 0xd9,
+ JBT_REG_OEV_TIMING_QVGA = 0xde,
+ JBT_REG_ASW_TIMING_1_QVGA = 0xdf,
+ JBT_REG_ASW_TIMING_2_QVGA = 0xe0,
+
+
+ JBT_REG_HCLOCK_VGA = 0xec,
+ JBT_REG_HCLOCK_QVGA = 0xed,
+};
+
+enum jbt_resolution {
+ JBT_RESOLUTION_VGA,
+ JBT_RESOLUTION_QVGA,
+};
+
+enum jbt_power_mode {
+ JBT_POWER_MODE_DEEP_STANDBY,
+ JBT_POWER_MODE_SLEEP,
+ JBT_POWER_MODE_NORMAL,
+};
+
+static const char *jbt_power_mode_names[] = {
+ [JBT_POWER_MODE_DEEP_STANDBY] = "deep-standby",
+ [JBT_POWER_MODE_SLEEP] = "sleep",
+ [JBT_POWER_MODE_NORMAL] = "normal",
+};
+
+static const char *jbt_resolution_names[] = {
+ [JBT_RESOLUTION_VGA] = "vga",
+ [JBT_RESOLUTION_QVGA] = "qvga",
+};
+
+struct jbt_info {
+ struct mutex lock; /* protects this structure */
+ enum jbt_resolution resolution;
+ enum jbt_power_mode power_mode;
+ enum jbt_power_mode suspend_mode;
+ int suspended;
+
+ struct spi_device *spi;
+ struct lcd_device *lcd_dev;
+
+ unsigned long next_sleep;
+ struct delayed_work blank_work;
+ int blank_mode;
+ struct regulator_bulk_data supplies[2];
+ uint16_t tx_buf[3];
+ uint16_t reg_cache[0xEE];
+};
+
+#define JBT_COMMAND 0x000
+#define JBT_DATA 0x100
+
+static int jbt_reg_write_nodata(struct jbt_info *jbt, uint8_t reg)
+{
+ int ret;
+
+ jbt->tx_buf[0] = JBT_COMMAND | reg;
+ ret = spi_write(jbt->spi, (uint8_t *)jbt->tx_buf,
+ sizeof(uint16_t));
+ if (ret == 0)
+ jbt->reg_cache[reg] = 0;
+ else
+ dev_err(&jbt->spi->dev, "Write failed: %d\n", ret);
+
+ return ret;
+}
+
+
+static int jbt_reg_write(struct jbt_info *jbt, uint8_t reg, uint8_t data)
+{
+ int ret;
+
+ jbt->tx_buf[0] = JBT_COMMAND | reg;
+ jbt->tx_buf[1] = JBT_DATA | data;
+ ret = spi_write(jbt->spi, (uint8_t *)jbt->tx_buf,
+ 2*sizeof(uint16_t));
+ if (ret == 0)
+ jbt->reg_cache[reg] = data;
+ else
+ dev_err(&jbt->spi->dev, "Write failed: %d\n", ret);
+
+ return ret;
+}
+
+static int jbt_reg_write16(struct jbt_info *jbt, uint8_t reg, uint16_t data)
+{
+ int ret;
+
+ jbt->tx_buf[0] = JBT_COMMAND | reg;
+ jbt->tx_buf[1] = JBT_DATA | (data >> 8);
+ jbt->tx_buf[2] = JBT_DATA | (data & 0xff);
+
+ ret = spi_write(jbt->spi, (uint8_t *)jbt->tx_buf,
+ 3*sizeof(uint16_t));
+ if (ret == 0)
+ jbt->reg_cache[reg] = data;
+ else
+ dev_err(&jbt->spi->dev, "Write failed: %d\n", ret);
+
+ return ret;
+}
+
+static int jbt_init_regs(struct jbt_info *jbt)
+{
+ int ret;
+
+ dev_dbg(&jbt->spi->dev, "entering %cVGA mode\n",
+ jbt->resolution == JBT_RESOLUTION_QVGA ? 'Q' : ' ');
+
+ ret = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01);
+ ret |= jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00);
+ ret |= jbt_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60);
+ ret |= jbt_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10);
+ ret |= jbt_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56);
+ ret |= jbt_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33);
+ ret |= jbt_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11);
+ ret |= jbt_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02);
+ ret |= jbt_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b);
+ ret |= jbt_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40);
+ ret |= jbt_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03);
+ ret |= jbt_reg_write(jbt, JBT_REG_DCCLK_DCEV, 0x04);
+ /*
+ * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
+ * to avoid red / blue flicker
+ */
+ ret |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x00 | (1 << 5));
+ ret |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00);
+
+ ret |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11);
+ ret |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11);
+ ret |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11);
+ ret |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040);
+ ret |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0);
+ ret |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020);
+ ret |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0);
+
+ ret |= jbt_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533);
+ ret |= jbt_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00);
+ ret |= jbt_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00);
+ ret |= jbt_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00);
+
+ if (jbt->resolution != JBT_RESOLUTION_QVGA) {
+ ret |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0);
+ ret |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02);
+ ret |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804);
+
+ ret |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01);
+ ret |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000);
+
+ ret |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e);
+ ret |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4);
+ ret |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e);
+ } else {
+ ret |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff);
+ ret |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02);
+ ret |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804);
+
+ ret |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01);
+ ret |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008);
+
+ ret |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a);
+ ret |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19);
+ ret |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a);
+ }
+
+ return ret ? -EIO : 0;
+}
+
+static int jbt_standby_to_sleep(struct jbt_info *jbt)
+{
+ int ret;
+ struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data;
+
+ gpio_set_value_cansleep(pdata->gpio_reset, 1);
+ ret = regulator_bulk_enable(ARRAY_SIZE(jbt->supplies), jbt->supplies);
+
+ /* three times command zero */
+ ret |= jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+ ret |= jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+ ret |= jbt_reg_write_nodata(jbt, 0x00);
+ mdelay(1);
+
+ /* deep standby out */
+ ret |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x11);
+ mdelay(1);
+ ret = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x28);
+
+ /* (re)initialize register set */
+ ret |= jbt_init_regs(jbt);
+
+ return ret ? -EIO : 0;
+}
+
+static int jbt_sleep_to_normal(struct jbt_info *jbt)
+{
+ int ret;
+
+ /* Make sure we are 120 ms after SLEEP_OUT */
+ if (time_before(jiffies, jbt->next_sleep))
+ mdelay(jiffies_to_msecs(jbt->next_sleep - jiffies));
+
+ if (jbt->resolution == JBT_RESOLUTION_VGA) {
+ /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
+ ret = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80);
+
+ /* Quad mode off */
+ ret |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00);
+ } else {
+ /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
+ ret = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81);
+
+ /* Quad mode on */
+ ret |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22);
+ }
+
+ /* AVDD on, XVDD on */
+ ret |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16);
+
+ /* Output control */
+ ret |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xdff9);
+
+ /* Turn on display */
+ ret |= jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
+
+ /* Sleep mode off */
+ ret |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT);
+ jbt->next_sleep = jiffies + msecs_to_jiffies(120);
+
+ /* Allow the booster and display controller to restart stably */
+ mdelay(5);
+
+ return ret ? -EIO : 0;
+}
+
+static int jbt_normal_to_sleep(struct jbt_info *jbt)
+{
+ int ret;
+
+ /* Make sure we are 120 ms after SLEEP_OUT */
+ while (time_before(jiffies, jbt->next_sleep))
+ cpu_relax();
+
+ ret = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
+ ret |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8000 | 1 << 3);
+ ret |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
+ jbt->next_sleep = jiffies + msecs_to_jiffies(120);
+
+ /* Allow the internal circuits to stop automatically */
+ mdelay(5);
+
+ return ret ? -EIO : 0;
+}
+
+static int jbt_sleep_to_standby(struct jbt_info *jbt)
+{
+ int ret;
+ struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data;
+
+ ret = jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
+
+ if (!ret)
+ ret = regulator_bulk_disable(ARRAY_SIZE(jbt->supplies), jbt->supplies);
+
+ if (!ret)
+ gpio_set_value_cansleep(pdata->gpio_reset, 0);
+
+ return ret;
+}
+
+static int jbt6k74_enter_power_mode(struct jbt_info *jbt,
+ enum jbt_power_mode new_mode)
+{
+ struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data;
+ int ret = -EINVAL;
+
+ dev_dbg(&jbt->spi->dev, "entering (old_state=%s, new_state=%s)\n",
+ jbt_power_mode_names[jbt->power_mode],
+ jbt_power_mode_names[new_mode]);
+
+ mutex_lock(&jbt->lock);
+
+ if (jbt->suspended) {
+ switch (new_mode) {
+ case JBT_POWER_MODE_DEEP_STANDBY:
+ case JBT_POWER_MODE_SLEEP:
+ case JBT_POWER_MODE_NORMAL:
+ ret = 0;
+ jbt->suspend_mode = new_mode;
+ break;
+ default:
+ break;
+ }
+ } else if (new_mode == JBT_POWER_MODE_NORMAL &&
+ pdata->enable_pixel_clock) {
+ pdata->enable_pixel_clock(&jbt->spi->dev, 1);
+ }
+
+ switch (jbt->power_mode) {
+ case JBT_POWER_MODE_DEEP_STANDBY:
+ switch (new_mode) {
+ case JBT_POWER_MODE_DEEP_STANDBY:
+ ret = 0;
+ break;
+ case JBT_POWER_MODE_SLEEP:
+ ret = jbt_standby_to_sleep(jbt);
+ break;
+ case JBT_POWER_MODE_NORMAL:
+ /* first transition into sleep */
+ ret = jbt_standby_to_sleep(jbt);
+ /* then transition into normal */
+ ret |= jbt_sleep_to_normal(jbt);
+ break;
+ }
+ break;
+ case JBT_POWER_MODE_SLEEP:
+ switch (new_mode) {
+ case JBT_POWER_MODE_SLEEP:
+ ret = 0;
+ break;
+ case JBT_POWER_MODE_DEEP_STANDBY:
+ ret = jbt_sleep_to_standby(jbt);
+ break;
+ case JBT_POWER_MODE_NORMAL:
+ ret = jbt_sleep_to_normal(jbt);
+ break;
+ }
+ break;
+ case JBT_POWER_MODE_NORMAL:
+ switch (new_mode) {
+ case JBT_POWER_MODE_NORMAL:
+ ret = 0;
+ break;
+ case JBT_POWER_MODE_DEEP_STANDBY:
+ /* first transition into sleep */
+ ret = jbt_normal_to_sleep(jbt);
+ /* then transition into deep standby */
+ ret |= jbt_sleep_to_standby(jbt);
+ break;
+ case JBT_POWER_MODE_SLEEP:
+ ret = jbt_normal_to_sleep(jbt);
+ break;
+ }
+ }
+
+ if (ret == 0) {
+ jbt->power_mode = new_mode;
+ if (new_mode != JBT_POWER_MODE_NORMAL &&
+ pdata->enable_pixel_clock)
+ pdata->enable_pixel_clock(&jbt->spi->dev, 0);
+ } else {
+ dev_err(&jbt->spi->dev, "Failed enter state '%s': %d\n",
+ jbt_power_mode_names[new_mode], ret);
+ }
+
+ mutex_unlock(&jbt->lock);
+
+ return ret;
+}
+
+static int jbt6k74_set_resolution(struct jbt_info *jbt,
+ enum jbt_resolution new_resolution)
+{
+ int ret = 0;
+ enum jbt_resolution old_resolution;
+
+ mutex_lock(&jbt->lock);
+
+ if (jbt->resolution == new_resolution)
+ goto out_unlock;
+
+ old_resolution = jbt->resolution;
+ jbt->resolution = new_resolution;
+
+ if (jbt->power_mode == JBT_POWER_MODE_NORMAL) {
+
+ /* first transition into sleep */
+ ret = jbt_normal_to_sleep(jbt);
+ ret |= jbt_sleep_to_normal(jbt);
+
+ if (ret) {
+ jbt->resolution = old_resolution;
+ dev_err(&jbt->spi->dev, "Failed to set resolution '%s')\n",
+ jbt_resolution_names[new_resolution]);
+ }
+ }
+
+out_unlock:
+ mutex_unlock(&jbt->lock);
+
+ return ret;
+}
+
+static ssize_t resolution_read(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct jbt_info *jbt = dev_get_drvdata(dev);
+
+ if (jbt->resolution >= ARRAY_SIZE(jbt_resolution_names))
+ return -EIO;
+
+ return sprintf(buf, "%s\n", jbt_resolution_names[jbt->resolution]);
+}
+
+static ssize_t resolution_write(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct jbt_info *jbt = dev_get_drvdata(dev);
+ int i, ret;
+
+ for (i = 0; i < ARRAY_SIZE(jbt_resolution_names); i++) {
+ if (!strncmp(buf, jbt_resolution_names[i],
+ strlen(jbt_resolution_names[i]))) {
+ ret = jbt6k74_set_resolution(jbt, i);
+ if (ret)
+ return ret;
+ return count;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static DEVICE_ATTR(resolution, 0644, resolution_read, resolution_write);
+
+static int reg_by_string(const char *name)
+{
+ if (!strcmp(name, "gamma_fine1"))
+ return JBT_REG_GAMMA1_FINE_1;
+ else if (!strcmp(name, "gamma_fine2"))
+ return JBT_REG_GAMMA1_FINE_2;
+ else if (!strcmp(name, "gamma_inclination"))
+ return JBT_REG_GAMMA1_INCLINATION;
+ else
+ return JBT_REG_GAMMA1_BLUE_OFFSET;
+}
+
+static ssize_t gamma_read(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct jbt_info *jbt = dev_get_drvdata(dev);
+ int reg = reg_by_string(attr->attr.name);
+ uint16_t val;
+
+ mutex_lock(&jbt->lock);
+ val = jbt->reg_cache[reg];
+ mutex_unlock(&jbt->lock);
+
+ return sprintf(buf, "0x%04x\n", val);
+}
+
+static ssize_t gamma_write(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ struct jbt_info *jbt = dev_get_drvdata(dev);
+ int reg = reg_by_string(attr->attr.name);
+ unsigned long val;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&jbt->lock);
+ jbt_reg_write(jbt, reg, val & 0xff);
+ mutex_unlock(&jbt->lock);
+
+ return count;
+}
+
+static ssize_t reset_write(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+ struct jbt_info *jbt = dev_get_drvdata(dev);
+ struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data;
+ enum jbt_power_mode old_power_mode = jbt->power_mode;
+
+ mutex_lock(&jbt->lock);
+
+ if (gpio_is_valid(pdata->gpio_reset)) {
+ /* hard reset the jbt6k74 */
+ gpio_set_value_cansleep(pdata->gpio_reset, 0);
+ mdelay(120);
+ gpio_set_value_cansleep(pdata->gpio_reset, 1);
+ mdelay(120);
+ }
+
+ ret = jbt_reg_write_nodata(jbt, 0x01);
+ if (ret < 0)
+ dev_err(&jbt->spi->dev, "cannot soft reset\n");
+ mdelay(120);
+
+ mutex_unlock(&jbt->lock);
+
+ jbt->power_mode = JBT_POWER_MODE_DEEP_STANDBY;
+ jbt6k74_enter_power_mode(jbt, old_power_mode);
+
+ return count;
+}
+
+static DEVICE_ATTR(gamma_fine1, 0644, gamma_read, gamma_write);
+static DEVICE_ATTR(gamma_fine2, 0644, gamma_read, gamma_write);
+static DEVICE_ATTR(gamma_inclination, 0644, gamma_read, gamma_write);
+static DEVICE_ATTR(gamma_blue_offset, 0644, gamma_read, gamma_write);
+static DEVICE_ATTR(reset, 0600, NULL, reset_write);
+
+static struct attribute *jbt_sysfs_entries[] = {
+ &dev_attr_resolution.attr,
+ &dev_attr_gamma_fine1.attr,
+ &dev_attr_gamma_fine2.attr,
+ &dev_attr_gamma_inclination.attr,
+ &dev_attr_gamma_blue_offset.attr,
+ &dev_attr_reset.attr,
+ NULL,
+};
+
+static struct attribute_group jbt_attr_group = {
+ .name = NULL,
+ .attrs = jbt_sysfs_entries,
+};
+
+/* FIXME: This in an ugly hack to delay display blanking.
+ When the jbt is in sleep mode it displays an all white screen and thus one
+ will a see a short flash.
+ By delaying the blanking we will give the backlight a chance to turn off and
+ thus avoid getting the flash */
+static void jbt_blank_worker(struct work_struct *work)
+{
+ struct jbt_info *jbt = container_of(work, struct jbt_info,
+ blank_work.work);
+
+ switch (jbt->blank_mode) {
+ case FB_BLANK_NORMAL:
+ jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
+ break;
+ case FB_BLANK_POWERDOWN:
+ jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
+ break;
+ default:
+ break;
+ }
+}
+
+static int jbt6k74_set_mode(struct lcd_device *ld, struct fb_videomode *m)
+{
+ int ret = -EINVAL;
+ struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
+
+ if (m->xres == 240 && m->yres == 320) {
+ ret = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_QVGA);
+ } else if (m->xres == 480 && m->yres == 640) {
+ ret = jbt6k74_set_resolution(jbt, JBT_RESOLUTION_VGA);
+ } else {
+ dev_err(&jbt->spi->dev, "Unknown resolution.\n");
+ jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_SLEEP);
+ }
+
+ return ret;
+}
+
+static int jbt6k74_set_power(struct lcd_device *ld, int power)
+{
+ int ret = -EINVAL;
+ struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
+
+ jbt->blank_mode = power;
+ cancel_rearming_delayed_work(&jbt->blank_work);
+
+ switch (power) {
+ case FB_BLANK_UNBLANK:
+ dev_dbg(&jbt->spi->dev, "unblank\n");
+ mdelay(20);
+ ret = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
+ break;
+ case FB_BLANK_NORMAL:
+ dev_dbg(&jbt->spi->dev, "blank\n");
+ ret = schedule_delayed_work(&jbt->blank_work, HZ);
+ break;
+ case FB_BLANK_POWERDOWN:
+ dev_dbg(&jbt->spi->dev, "powerdown\n");
+ ret = schedule_delayed_work(&jbt->blank_work, HZ);
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int jbt6k74_get_power(struct lcd_device *ld)
+{
+ struct jbt_info *jbt = dev_get_drvdata(&ld->dev);
+
+ switch (jbt->power_mode) {
+ case JBT_POWER_MODE_NORMAL:
+ return FB_BLANK_UNBLANK;
+ case JBT_POWER_MODE_SLEEP:
+ return FB_BLANK_NORMAL;
+ default:
+ return JBT_POWER_MODE_DEEP_STANDBY;
+ }
+}
+
+struct lcd_ops jbt6k74_lcd_ops = {
+ .set_power = jbt6k74_set_power,
+ .get_power = jbt6k74_get_power,
+ .set_mode = jbt6k74_set_mode,
+};
+
+/* linux device model infrastructure */
+
+static int __devinit jbt_probe(struct spi_device *spi)
+{
+ int ret;
+ struct jbt_info *jbt;
+ struct jbt6k74_platform_data *pdata = spi->dev.platform_data;
+
+ /* the controller doesn't have a MISO pin; we can't do detection */
+
+ spi->mode = SPI_CPOL | SPI_CPHA;
+ spi->bits_per_word = 9;
+
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(&spi->dev,
+ "Failed to setup spi\n");
+ return ret;
+ }
+
+ jbt = kzalloc(sizeof(*jbt), GFP_KERNEL);
+ if (!jbt)
+ return -ENOMEM;
+
+ jbt->spi = spi;
+
+ jbt->lcd_dev = lcd_device_register("jbt6k74-lcd", &spi->dev, jbt,
+ &jbt6k74_lcd_ops);
+
+ if (IS_ERR(jbt->lcd_dev)) {
+ ret = PTR_ERR(jbt->lcd_dev);
+ goto err_free_drvdata;
+ }
+
+ INIT_DELAYED_WORK(&jbt->blank_work, jbt_blank_worker);
+
+ jbt->resolution = JBT_RESOLUTION_VGA;
+ jbt->power_mode = JBT_POWER_MODE_DEEP_STANDBY;
+ jbt->next_sleep = jiffies + msecs_to_jiffies(120);
+ mutex_init(&jbt->lock);
+
+ dev_set_drvdata(&spi->dev, jbt);
+
+ jbt->supplies[0].supply = "VDC";
+ jbt->supplies[1].supply = "VDDIO";
+
+ ret = regulator_bulk_get(&spi->dev, ARRAY_SIZE(jbt->supplies),
+ jbt->supplies);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to power get supplies: %d\n", ret);
+ goto err_unregister_lcd;
+ }
+
+ if (gpio_is_valid(pdata->gpio_reset)) {
+ ret = gpio_request(pdata->gpio_reset, "jbt6k74 reset");
+ if (ret) {
+ dev_err(&spi->dev, "Failed to request reset gpio: %d\n",
+ ret);
+ goto err_free_supplies;
+ }
+
+ ret = gpio_direction_output(pdata->gpio_reset, 1);
+ if (ret) {
+ dev_err(&spi->dev, "Failed to set reset gpio direction: %d\n",
+ ret);
+ goto err_gpio_free;
+ }
+ }
+
+ ret = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
+ if (ret < 0) {
+ dev_err(&spi->dev, "cannot create sysfs group\n");
+ goto err_gpio_free;
+ }
+
+ mdelay(50);
+ ret = jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
+ if (ret < 0) {
+ dev_err(&spi->dev, "cannot enter NORMAL state\n");
+ goto err_sysfs_remove;
+ }
+
+
+ if (pdata->probe_completed)
+ (pdata->probe_completed)(&spi->dev);
+
+ return 0;
+
+err_sysfs_remove:
+ sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
+err_gpio_free:
+ gpio_free(pdata->gpio_reset);
+err_free_supplies:
+ regulator_bulk_free(ARRAY_SIZE(jbt->supplies), jbt->supplies);
+err_unregister_lcd:
+ lcd_device_unregister(jbt->lcd_dev);
+err_free_drvdata:
+ dev_set_drvdata(&spi->dev, NULL);
+ kfree(jbt);
+
+ return ret;
+}
+
+static int __devexit jbt_remove(struct spi_device *spi)
+{
+ struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
+ struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data;
+
+ /* We don't want to switch off the display in case the user
+ * accidentially unloads the module (whose use count normally is 0) */
+ jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_NORMAL);
+
+ sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
+
+ if (gpio_is_valid(pdata->gpio_reset))
+ gpio_free(pdata->gpio_reset);
+
+ lcd_device_unregister(jbt->lcd_dev);
+
+ dev_set_drvdata(&spi->dev, NULL);
+
+ regulator_bulk_free(ARRAY_SIZE(jbt->supplies), jbt->supplies);
+ kfree(jbt);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int jbt_suspend(struct spi_device *spi, pm_message_t state)
+{
+ struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
+
+ jbt->suspend_mode = jbt->power_mode;
+
+ jbt6k74_enter_power_mode(jbt, JBT_POWER_MODE_DEEP_STANDBY);
+ jbt->suspended = 1;
+
+ dev_info(&spi->dev, "suspended\n");
+
+ return 0;
+}
+
+int jbt6k74_resume(struct spi_device *spi)
+{
+ struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
+ dev_info(&spi->dev, "starting resume: %d\n", jbt->suspend_mode);
+
+ mdelay(20);
+
+ jbt->suspended = 0;
+ jbt6k74_enter_power_mode(jbt, jbt->suspend_mode);
+
+ dev_info(&spi->dev, "resumed: %d\n", jbt->suspend_mode);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(jbt6k74_resume);
+
+#else
+#define jbt_suspend NULL
+#define jbt6k74_resume NULL
+#endif
+
+static struct spi_driver jbt6k74_driver = {
+ .driver = {
+ .name = "jbt6k74",
+ .owner = THIS_MODULE,
+ },
+
+ .probe = jbt_probe,
+ .remove = __devexit_p(jbt_remove),
+ .suspend = jbt_suspend,
+ .resume = jbt6k74_resume,
+};
+
+static int __init jbt_init(void)
+{
+ return spi_register_driver(&jbt6k74_driver);
+}
+module_init(jbt_init);
+
+static void __exit jbt_exit(void)
+{
+ spi_unregister_driver(&jbt6k74_driver);
+}
+module_exit(jbt_exit);
+
+MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface");
+MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 13:46:08 +0000