From 4e11662e7b95b1a8cdee1f5af9dc5ec49ce3c129 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Sun, 4 Oct 2009 13:37:37 +0200 Subject: [PATCH 33/69] Add jbt6k74 display driver. --- drivers/video/backlight/Kconfig | 14 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/jbt6k74.c | 895 +++++++++++++++++++++++++++++++++++++ include/linux/jbt6k74.h | 18 + 4 files changed, 928 insertions(+), 0 deletions(-) create mode 100644 drivers/video/backlight/jbt6k74.c create mode 100644 include/linux/jbt6k74.h diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 0c9373b..664509e 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -117,6 +117,20 @@ config LCD_LD9040 If you have an LD9040 Panel, say Y to enable its 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. + endif # LCD_CLASS_DEVICE # diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index b9ca849..fe67e97 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_LCD_TDO24M) += tdo24m.o obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o obj-$(CONFIG_LCD_S6E63M0) += s6e63m0.o obj-$(CONFIG_LCD_LD9040) += ld9040.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 0000000..d53a366 --- /dev/null +++ b/drivers/video/backlight/jbt6k74.c @@ -0,0 +1,895 @@ +/* Linux kernel driver for the tpo JBT6K74-AS LCM ASIC + * + * Copyright (C) 2006-2007 by Openmoko, Inc. + * Author: Harald Welte , + * Stefan Schmidt + * Copyright (C) 2008 by Harald Welte + * Copyright (C) 2009 by Lars-Peter Clausen + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum jbt6k74_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 jbt6k74_resolution { + JBT_RESOLUTION_VGA, + JBT_RESOLUTION_QVGA, +}; + +enum jbt6k74_power_mode { + JBT_POWER_MODE_DEEP_STANDBY, + JBT_POWER_MODE_SLEEP, + JBT_POWER_MODE_NORMAL, +}; + +static const char * const jbt6k74_power_mode_names[] = { + [JBT_POWER_MODE_DEEP_STANDBY] = "deep-standby", + [JBT_POWER_MODE_SLEEP] = "sleep", + [JBT_POWER_MODE_NORMAL] = "normal", +}; + +static const char * const jbt6k74_resolution_names[] = { + [JBT_RESOLUTION_VGA] = "vga", + [JBT_RESOLUTION_QVGA] = "qvga", +}; + +struct jbt6k74_info { + struct mutex lock; /* protects this structure */ + enum jbt6k74_resolution resolution; + enum jbt6k74_power_mode power_mode; + enum jbt6k74_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 jbt6k74_reg_write_nodata(struct jbt6k74_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 jbt6k74_reg_write(struct jbt6k74_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 jbt6k74_reg_write16(struct jbt6k74_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 jbt6k74_init_regs(struct jbt6k74_info *jbt) +{ + int ret; + + dev_dbg(&jbt->spi->dev, "entering %cVGA mode\n", + jbt->resolution == JBT_RESOLUTION_QVGA ? 'Q' : ' '); + + ret = jbt6k74_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01); + ret |= jbt6k74_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00); + ret |= jbt6k74_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60); + ret |= jbt6k74_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10); + ret |= jbt6k74_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56); + ret |= jbt6k74_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33); + ret |= jbt6k74_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11); + ret |= jbt6k74_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02); + ret |= jbt6k74_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b); + ret |= jbt6k74_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40); + ret |= jbt6k74_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03); + ret |= jbt6k74_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 |= jbt6k74_reg_write(jbt, JBT_REG_ASW_SLEW, 0x00 | (1 << 5)); + ret |= jbt6k74_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00); + + ret |= jbt6k74_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11); + ret |= jbt6k74_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11); + ret |= jbt6k74_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0); + + ret |= jbt6k74_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533); + ret |= jbt6k74_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00); + ret |= jbt6k74_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00); + ret |= jbt6k74_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00); + + if (jbt->resolution != JBT_RESOLUTION_QVGA) { + ret |= jbt6k74_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0); + ret |= jbt6k74_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804); + + ret |= jbt6k74_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000); + + ret |= jbt6k74_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4); + ret |= jbt6k74_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e); + } else { + ret |= jbt6k74_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff); + ret |= jbt6k74_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804); + + ret |= jbt6k74_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008); + + ret |= jbt6k74_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19); + ret |= jbt6k74_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a); + } + + return ret ? -EIO : 0; +} + +static int jbt6k74_standby_to_sleep(struct jbt6k74_info *jbt) +{ + int ret; + struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data; + + ret = regulator_bulk_enable(ARRAY_SIZE(jbt->supplies), jbt->supplies); + if (ret) + return ret; + + gpio_set_value_cansleep(pdata->gpio_reset, 1); + mdelay(100); + + /* three times command zero */ + ret |= jbt6k74_reg_write_nodata(jbt, 0x00); + mdelay(1); + ret |= jbt6k74_reg_write_nodata(jbt, 0x00); + mdelay(1); + ret |= jbt6k74_reg_write_nodata(jbt, 0x00); + mdelay(1); + + /* deep standby out */ + ret |= jbt6k74_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x11); + mdelay(1); + ret = jbt6k74_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x28); + + /* (re)initialize register set */ + ret |= jbt6k74_init_regs(jbt); + + return ret ? -EIO : 0; +} + +static int jbt6k74_sleep_to_normal(struct jbt6k74_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 = jbt6k74_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80); + + /* Quad mode off */ + ret |= jbt6k74_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00); + } else { + /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */ + ret = jbt6k74_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81); + + /* Quad mode on */ + ret |= jbt6k74_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22); + } + + /* AVDD on, XVDD on */ + ret |= jbt6k74_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16); + + /* Output control */ + ret |= jbt6k74_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xdff9); + + /* Turn on display */ + ret |= jbt6k74_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON); + + /* Sleep mode off */ + ret |= jbt6k74_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 jbt6k74_normal_to_sleep(struct jbt6k74_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)); + + ret = jbt6k74_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF); + ret |= jbt6k74_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8000 | 1 << 3); + ret |= jbt6k74_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 jbt6k74_sleep_to_standby(struct jbt6k74_info *jbt) +{ + int ret; + struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data; + + ret = jbt6k74_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00); + + if (!ret) { + gpio_set_value_cansleep(pdata->gpio_reset, 0); + ret = regulator_bulk_disable(ARRAY_SIZE(jbt->supplies), + jbt->supplies); + } + + return ret; +} + +static int jbt6k74_enter_power_mode(struct jbt6k74_info *jbt, + enum jbt6k74_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", + jbt6k74_power_mode_names[jbt->power_mode], + jbt6k74_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 = jbt6k74_standby_to_sleep(jbt); + break; + case JBT_POWER_MODE_NORMAL: + /* first transition into sleep */ + ret = jbt6k74_standby_to_sleep(jbt); + /* then transition into normal */ + ret |= jbt6k74_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 = jbt6k74_sleep_to_standby(jbt); + break; + case JBT_POWER_MODE_NORMAL: + ret = jbt6k74_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 = jbt6k74_normal_to_sleep(jbt); + /* then transition into deep standby */ + ret |= jbt6k74_sleep_to_standby(jbt); + break; + case JBT_POWER_MODE_SLEEP: + ret = jbt6k74_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", + jbt6k74_power_mode_names[new_mode], ret); + } + + mutex_unlock(&jbt->lock); + + return ret; +} + +static int jbt6k74_set_resolution(struct jbt6k74_info *jbt, + enum jbt6k74_resolution new_resolution) +{ + int ret = 0; + enum jbt6k74_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 = jbt6k74_normal_to_sleep(jbt); + ret |= jbt6k74_sleep_to_normal(jbt); + + if (ret) { + jbt->resolution = old_resolution; + dev_err(&jbt->spi->dev, "Failed to set resolution '%s')\n", + jbt6k74_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 jbt6k74_info *jbt = dev_get_drvdata(dev); + + if (jbt->resolution >= ARRAY_SIZE(jbt6k74_resolution_names)) + return -EIO; + + return sprintf(buf, "%s\n", jbt6k74_resolution_names[jbt->resolution]); +} + +static ssize_t resolution_write(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct jbt6k74_info *jbt = dev_get_drvdata(dev); + int i, ret; + + for (i = 0; i < ARRAY_SIZE(jbt6k74_resolution_names); i++) { + if (!strncmp(buf, jbt6k74_resolution_names[i], + strlen(jbt6k74_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 jbt6k74_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 jbt6k74_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); + jbt6k74_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 jbt6k74_info *jbt = dev_get_drvdata(dev); + struct jbt6k74_platform_data *pdata = jbt->spi->dev.platform_data; + enum jbt6k74_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 = jbt6k74_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 *jbt6k74_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 jbt6k74_attr_group = { + .name = NULL, + .attrs = jbt6k74_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 jbt6k74_blank_worker(struct work_struct *work) +{ + struct jbt6k74_info *jbt = container_of(work, struct jbt6k74_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 jbt6k74_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 jbt6k74_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 jbt6k74_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; + } +} + +static 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 jbt6k74_probe(struct spi_device *spi) +{ + int ret; + struct jbt6k74_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, jbt6k74_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, &jbt6k74_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; + } + + return 0; + +err_sysfs_remove: + sysfs_remove_group(&spi->dev.kobj, &jbt6k74_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 jbt6k74_remove(struct spi_device *spi) +{ + struct jbt6k74_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, &jbt6k74_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 jbt6k74_suspend(struct spi_device *spi, pm_message_t state) +{ + struct jbt6k74_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; +} + +static int jbt6k74_resume(struct spi_device *spi) +{ + struct jbt6k74_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; +} + +#else +#define jbt6k74_suspend NULL +#define jbt6k74_resume NULL +#endif + +static struct spi_driver jbt6k74_driver = { + .driver = { + .name = "jbt6k74", + .owner = THIS_MODULE, + }, + + .probe = jbt6k74_probe, + .remove = __devexit_p(jbt6k74_remove), + .suspend = jbt6k74_suspend, + .resume = jbt6k74_resume, +}; + +static int __init jbt6k74_init(void) +{ + return spi_register_driver(&jbt6k74_driver); +} +module_init(jbt6k74_init); + +static void __exit jbt6k74_exit(void) +{ + spi_unregister_driver(&jbt6k74_driver); +} +module_exit(jbt6k74_exit); + +MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface"); +MODULE_AUTHOR("Harald Welte "); +MODULE_LICENSE("GPL"); diff --git a/include/linux/jbt6k74.h b/include/linux/jbt6k74.h new file mode 100644 index 0000000..3f0735d --- /dev/null +++ b/include/linux/jbt6k74.h @@ -0,0 +1,18 @@ +#ifndef __JBT6K74_H__ +#define __JBT6K74_H__ + +#include + +/* + * struct jbt6k74_platform_data - Platform data for jbt6k74 driver + * @enable_pixel_clock: Callback to enable or disable the pixelclock of the + * gpu. + * @gpio_reset: Reset gpio pin number. + */ +struct jbt6k74_platform_data { + void (*enable_pixel_clock)(struct device *dev, int enable); + + int gpio_reset; +}; + +#endif -- 1.7.2.5