diff options
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/video/display/jbt6k74.c')
| -rw-r--r-- | target/linux/s3c24xx/files-2.6.30/drivers/video/display/jbt6k74.c | 772 |
1 files changed, 772 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/video/display/jbt6k74.c b/target/linux/s3c24xx/files-2.6.30/drivers/video/display/jbt6k74.c new file mode 100644 index 0000000000..eb4e46d13c --- /dev/null +++ b/target/linux/s3c24xx/files-2.6.30/drivers/video/display/jbt6k74.c @@ -0,0 +1,772 @@ +/* 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> + * 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/jbt6k74.h> +#include <linux/fb.h> +#include <linux/time.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_state { + JBT_STATE_DEEP_STANDBY, + JBT_STATE_SLEEP, + JBT_STATE_NORMAL, + JBT_STATE_QVGA_NORMAL, +}; + +static const char *jbt_state_names[] = { + [JBT_STATE_DEEP_STANDBY] = "deep-standby", + [JBT_STATE_SLEEP] = "sleep", + [JBT_STATE_NORMAL] = "normal", + [JBT_STATE_QVGA_NORMAL] = "qvga-normal", +}; + +struct jbt_info { + enum jbt_state state, normal_state; + struct spi_device *spi_dev; + struct mutex lock; /* protects tx_buf and reg_cache */ + struct notifier_block fb_notif; + u16 tx_buf[8]; + u16 reg_cache[0xEE]; + struct timespec last_sleep; +}; + +#define JBT_COMMAND 0x000 +#define JBT_DATA 0x100 + +static inline unsigned int timespec_sub_ms(struct timespec lhs, + struct timespec rhs) +{ + struct timespec ts = timespec_sub(lhs, rhs); + return (ts.tv_sec * MSEC_PER_SEC) + (ts.tv_nsec / NSEC_PER_MSEC); +} + +static int jbt_reg_write_nodata(struct jbt_info *jbt, u8 reg) +{ + int rc; + + jbt->tx_buf[0] = JBT_COMMAND | reg; + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf, + 1*sizeof(u16)); + if (rc == 0) + jbt->reg_cache[reg] = 0; + else + printk(KERN_ERR"jbt_reg_write_nodata spi_write ret %d\n", + rc); + + return rc; +} + + +static int jbt_reg_write(struct jbt_info *jbt, u8 reg, u8 data) +{ + int rc; + + jbt->tx_buf[0] = JBT_COMMAND | reg; + jbt->tx_buf[1] = JBT_DATA | data; + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf, + 2*sizeof(u16)); + if (rc == 0) + jbt->reg_cache[reg] = data; + else + printk(KERN_ERR"jbt_reg_write spi_write ret %d\n", rc); + + return rc; +} + +static int jbt_reg_write16(struct jbt_info *jbt, u8 reg, u16 data) +{ + int rc; + + jbt->tx_buf[0] = JBT_COMMAND | reg; + jbt->tx_buf[1] = JBT_DATA | (data >> 8); + jbt->tx_buf[2] = JBT_DATA | (data & 0xff); + + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf, + 3*sizeof(u16)); + if (rc == 0) + jbt->reg_cache[reg] = data; + else + printk(KERN_ERR"jbt_reg_write16 spi_write ret %d\n", rc); + + return rc; +} + +static int jbt_init_regs(struct jbt_info *jbt) +{ + int rc; + + dev_dbg(&jbt->spi_dev->dev, "entering %cVGA mode\n", + jbt->normal_state == JBT_STATE_QVGA_NORMAL ? 'Q' : ' '); + + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01); + rc |= jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00); + rc |= jbt_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60); + rc |= jbt_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10); + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56); + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33); + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11); + rc |= jbt_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02); + rc |= jbt_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b); + rc |= jbt_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40); + rc |= jbt_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03); + rc |= 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 + */ + rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04); + rc |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00); + + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11); + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11); + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11); + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040); + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0); + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020); + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0); + + rc |= jbt_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533); + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00); + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00); + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00); + + if (jbt->normal_state != JBT_STATE_QVGA_NORMAL) { + rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0); + rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02); + rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804); + + rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01); + rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000); + + rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e); + rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4); + rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e); + } else { + rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff); + rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02); + rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804); + + rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01); + rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008); + + rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a); + rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19); + rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a); + } + + return rc ? -EIO : 0; +} + +static int standby_to_sleep(struct jbt_info *jbt) +{ + int rc; + + /* three times command zero */ + rc = jbt_reg_write_nodata(jbt, 0x00); + mdelay(1); + rc |= jbt_reg_write_nodata(jbt, 0x00); + mdelay(1); + rc |= jbt_reg_write_nodata(jbt, 0x00); + mdelay(1); + + /* deep standby out */ + rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x11); + mdelay(1); + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x28); + + /* (re)initialize register set */ + rc |= jbt_init_regs(jbt); + + return rc ? -EIO : 0; +} + +static int sleep_to_normal(struct jbt_info *jbt) +{ + int rc; + + /* Make sure we are 120 ms after SLEEP_OUT */ + unsigned int sleep_time = timespec_sub_ms(current_kernel_time(), + jbt->last_sleep); + if (sleep_time < 120) + mdelay(120 - sleep_time); + + if (jbt->normal_state == JBT_STATE_NORMAL) { + /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */ + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80); + + /* Quad mode off */ + rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00); + } else { + /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */ + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81); + + /* Quad mode on */ + rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22); + } + + /* AVDD on, XVDD on */ + rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16); + + /* Output control */ + rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xfff9); + + /* Turn on display */ + rc |= jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON); + + /* Sleep mode off */ + rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT); + jbt->last_sleep = current_kernel_time(); + + /* Allow the booster and display controller to restart stably */ + mdelay(5); + + return rc ? -EIO : 0; +} + +static int normal_to_sleep(struct jbt_info *jbt) +{ + int rc; + + /* Make sure we are 120 ms after SLEEP_OUT */ + unsigned int sleep_time = timespec_sub_ms(current_kernel_time(), + jbt->last_sleep); + if (sleep_time < 120) + mdelay(120 - sleep_time); + + rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF); + rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8002); + rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN); + jbt->last_sleep = current_kernel_time(); + + /* Allow the internal circuits to stop automatically */ + mdelay(5); + + return rc ? -EIO : 0; +} + +static int sleep_to_standby(struct jbt_info *jbt) +{ + return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00); +} + +/* frontend function */ +int jbt6k74_enter_state(struct jbt_info *jbt, enum jbt_state new_state) +{ + int rc = -EINVAL; + +/* dev_dbg(&jbt->spi_dev->dev, "entering (old_state=%s, new_state=%s)\n", + jbt_state_names[jbt->state], + jbt_state_names[new_state]);*/ + +/* printk("entering (old_state=%s, new_state=%s)\n", + jbt_state_names[jbt->state], + jbt_state_names[new_state]);*/ + + mutex_lock(&jbt->lock); + + if (new_state == JBT_STATE_NORMAL || + new_state == JBT_STATE_QVGA_NORMAL) + jbt->normal_state = new_state; + + switch (jbt->state) { + case JBT_STATE_DEEP_STANDBY: + switch (new_state) { + case JBT_STATE_DEEP_STANDBY: + rc = 0; + break; + case JBT_STATE_SLEEP: + rc = standby_to_sleep(jbt); + break; + case JBT_STATE_NORMAL: + /* first transition into sleep */ + rc = standby_to_sleep(jbt); + /* then transition into normal */ + rc |= sleep_to_normal(jbt); + break; + case JBT_STATE_QVGA_NORMAL: + /* first transition into sleep */ + rc = standby_to_sleep(jbt); + /* then transition into normal */ + rc |= sleep_to_normal(jbt); + break; + } + break; + case JBT_STATE_SLEEP: + switch (new_state) { + case JBT_STATE_SLEEP: + rc = 0; + break; + case JBT_STATE_DEEP_STANDBY: + rc = sleep_to_standby(jbt); + break; + case JBT_STATE_NORMAL: + case JBT_STATE_QVGA_NORMAL: + rc = sleep_to_normal(jbt); + break; + } + break; + case JBT_STATE_NORMAL: + switch (new_state) { + case JBT_STATE_NORMAL: + rc = 0; + break; + case JBT_STATE_DEEP_STANDBY: + /* first transition into sleep */ + rc = normal_to_sleep(jbt); + /* then transition into deep standby */ + rc |= sleep_to_standby(jbt); + break; + case JBT_STATE_SLEEP: + rc = normal_to_sleep(jbt); + break; + case JBT_STATE_QVGA_NORMAL: + /* first transition into sleep */ + rc = normal_to_sleep(jbt); + /* second transition into deep standby */ + rc |= sleep_to_standby(jbt); + /* third transition into sleep */ + rc |= standby_to_sleep(jbt); + /* fourth transition into normal */ + rc |= sleep_to_normal(jbt); + break; + } + break; + case JBT_STATE_QVGA_NORMAL: + switch (new_state) { + case JBT_STATE_QVGA_NORMAL: + rc = 0; + break; + case JBT_STATE_DEEP_STANDBY: + /* first transition into sleep */ + rc = normal_to_sleep(jbt); + /* then transition into deep standby */ + rc |= sleep_to_standby(jbt); + break; + case JBT_STATE_SLEEP: + rc = normal_to_sleep(jbt); + break; + case JBT_STATE_NORMAL: + /* first transition into sleep */ + rc = normal_to_sleep(jbt); + /* second transition into deep standby */ + rc |= sleep_to_standby(jbt); + /* third transition into sleep */ + rc |= standby_to_sleep(jbt); + /* fourth transition into normal */ + rc |= sleep_to_normal(jbt); + break; + } + break; + } + + if (rc == 0) + jbt->state = new_state; + else + dev_err(&jbt->spi_dev->dev, "Failed enter state '%s')\n", + jbt_state_names[new_state]); + + mutex_unlock(&jbt->lock); + + return rc; +} +EXPORT_SYMBOL_GPL(jbt6k74_enter_state); + +static ssize_t state_read(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct jbt_info *jbt = dev_get_drvdata(dev); + + if (jbt->state >= ARRAY_SIZE(jbt_state_names)) + return -EIO; + + return sprintf(buf, "%s\n", jbt_state_names[jbt->state]); +} + +static ssize_t state_write(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct jbt_info *jbt = dev_get_drvdata(dev); + int i, rc; + + for (i = 0; i < ARRAY_SIZE(jbt_state_names); i++) { + if (!strncmp(buf, jbt_state_names[i], + strlen(jbt_state_names[i]))) { + rc = jbt6k74_enter_state(jbt, i); + if (rc) + return rc; + return count; + } + } + + return -EINVAL; +} + +static DEVICE_ATTR(state, 0644, state_read, state_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); + u16 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) +{ + struct jbt_info *jbt = dev_get_drvdata(dev); + int reg = reg_by_string(attr->attr.name); + unsigned long val = simple_strtoul(buf, NULL, 10); + + dev_info(dev, "writing gama %lu\n", val & 0xff); + + 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 rc; + struct jbt_info *jbt = dev_get_drvdata(dev); + struct jbt6k74_platform_data *pdata = jbt->spi_dev->dev.platform_data; + + dev_info(dev, "reset\n"); + + mutex_lock(&jbt->lock); + + jbt->state = JBT_STATE_DEEP_STANDBY; + + /* hard reset the jbt6k74 */ + (pdata->reset)(0, 0); + mdelay(1); + (pdata->reset)(0, 1); + mdelay(120); + + rc = jbt_reg_write_nodata(jbt, 0x01); + if (rc < 0) + dev_err(&jbt->spi_dev->dev, "cannot soft reset\n"); + mdelay(120); + + mutex_unlock(&jbt->lock); + + jbt6k74_enter_state(jbt, jbt->normal_state); + + 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_state.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, +}; + +static int fb_notifier_callback(struct notifier_block *self, + unsigned long event, void *data) +{ + struct jbt_info *jbt; + struct fb_event *evdata = data; + int fb_blank; + + jbt = container_of(self, struct jbt_info, fb_notif); + + dev_dbg(&jbt->spi_dev->dev, "event=%lu\n", event); + + if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK) + return 0; + + fb_blank = *(int *)evdata->data; + switch (fb_blank) { + case FB_BLANK_UNBLANK: + dev_dbg(&jbt->spi_dev->dev, "unblank\n"); + jbt6k74_enter_state(jbt, jbt->normal_state); + break; + case FB_BLANK_NORMAL: + dev_dbg(&jbt->spi_dev->dev, "blank\n"); + break; + case FB_BLANK_VSYNC_SUSPEND: + dev_dbg(&jbt->spi_dev->dev, "vsync suspend\n"); + break; + case FB_BLANK_HSYNC_SUSPEND: + dev_dbg(&jbt->spi_dev->dev, "hsync suspend\n"); + break; + case FB_BLANK_POWERDOWN: + dev_dbg(&jbt->spi_dev->dev, "powerdown\n"); + jbt6k74_enter_state(jbt, JBT_STATE_SLEEP); + break; + } + + return 0; +} + +/* linux device model infrastructure */ + +static int __devinit jbt_probe(struct spi_device *spi) +{ + int rc; + 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; + + rc = spi_setup(spi); + if (rc < 0) { + dev_err(&spi->dev, + "error during spi_setup of jbt6k74 driver\n"); + return rc; + } + + jbt = kzalloc(sizeof(*jbt), GFP_KERNEL); + if (!jbt) + return -ENOMEM; + + jbt->spi_dev = spi; + jbt->normal_state = JBT_STATE_NORMAL; + jbt->state = JBT_STATE_DEEP_STANDBY; + jbt->last_sleep = current_kernel_time(); + mutex_init(&jbt->lock); + + dev_set_drvdata(&spi->dev, jbt); + + rc = jbt6k74_enter_state(jbt, JBT_STATE_NORMAL); + if (rc < 0) { + dev_err(&spi->dev, "cannot enter NORMAL state\n"); + goto err_free_drvdata; + } + + rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group); + if (rc < 0) { + dev_err(&spi->dev, "cannot create sysfs group\n"); + goto err_standby; + } + + jbt->fb_notif.notifier_call = fb_notifier_callback; + rc = fb_register_client(&jbt->fb_notif); + if (rc < 0) { + dev_err(&spi->dev, "cannot register notifier\n"); + goto err_sysfs; + } + + if (pdata->probe_completed) + (pdata->probe_completed)(&spi->dev); + + return 0; + +err_sysfs: + sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group); +err_standby: + jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY); +err_free_drvdata: + dev_set_drvdata(&spi->dev, NULL); + kfree(jbt); + + return rc; +} + +static int __devexit jbt_remove(struct spi_device *spi) +{ + struct jbt_info *jbt = dev_get_drvdata(&spi->dev); + + /* We don't want to switch off the display in case the user + * accidentially onloads the module (whose use count normally is 0) */ + jbt6k74_enter_state(jbt, jbt->normal_state); + + fb_unregister_client(&jbt->fb_notif); + sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group); + dev_set_drvdata(&spi->dev, NULL); + 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); + + jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY); + + dev_info(&spi->dev, "suspended\n"); + + return 0; +} + +int jbt6k74_resume(struct spi_device *spi) +{ + struct jbt_info *jbt = dev_get_drvdata(&spi->dev); + struct jbt6k74_platform_data *pdata = spi->dev.platform_data; + + jbt6k74_enter_state(jbt, jbt->normal_state); + + if (pdata->resuming) + (pdata->resuming)(0); + + dev_info(&spi->dev, "resumed\n"); + + 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); +} + +static void __exit jbt_exit(void) +{ + spi_unregister_driver(&jbt6k74_driver); +} + +MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface"); +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>"); +MODULE_LICENSE("GPL"); + +module_init(jbt_init); +module_exit(jbt_exit); |