diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/leds/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/leds/Makefile | 1 | ||||
| -rw-r--r-- | drivers/leds/leds-renesas-tpu.c | 337 | ||||
| -rw-r--r-- | drivers/video/backlight/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/video/backlight/Makefile | 3 | ||||
| -rw-r--r-- | drivers/video/backlight/bd6107.c | 213 | ||||
| -rw-r--r-- | drivers/video/backlight/gpio_backlight.c | 133 | ||||
| -rw-r--r-- | drivers/video/backlight/lv5207lp.c | 171 |
8 files changed, 539 insertions, 350 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index e43402dd1dea..074bcb3892b5 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -429,18 +429,6 @@ config LEDS_ASIC3 cannot be used. This driver supports hardware blinking with an on+off period from 62ms to 125s. Say Y to enable LEDs on the HP iPAQ hx4700. -config LEDS_RENESAS_TPU - bool "LED support for Renesas TPU" - depends on LEDS_CLASS=y && HAVE_CLK && GPIOLIB - help - This option enables build of the LED TPU platform driver, - suitable to drive any TPU channel on newer Renesas SoCs. - The driver controls the GPIO pin connected to the LED via - the GPIO framework and expects the LED to be connected to - a pin that can be driven in both GPIO mode and using TPU - pin function. The latter to support brightness control. - Brightness control is supported but hardware blinking is not. - config LEDS_TCA6507 tristate "LED Support for TCA6507 I2C chip" depends on LEDS_CLASS && I2C diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index ac2897732b02..ae4b6135f665 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -49,7 +49,6 @@ obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o obj-$(CONFIG_LEDS_NS2) += leds-ns2.o obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o -obj-$(CONFIG_LEDS_RENESAS_TPU) += leds-renesas-tpu.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o diff --git a/drivers/leds/leds-renesas-tpu.c b/drivers/leds/leds-renesas-tpu.c deleted file mode 100644 index adebf4931e1e..000000000000 --- a/drivers/leds/leds-renesas-tpu.c +++ /dev/null @@ -1,337 +0,0 @@ -/* - * LED control using Renesas TPU - * - * Copyright (C) 2011 Magnus Damm - * - * 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 - * - * 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/module.h> -#include <linux/init.h> -#include <linux/platform_device.h> -#include <linux/spinlock.h> -#include <linux/printk.h> -#include <linux/ioport.h> -#include <linux/io.h> -#include <linux/clk.h> -#include <linux/leds.h> -#include <linux/platform_data/leds-renesas-tpu.h> -#include <linux/gpio.h> -#include <linux/err.h> -#include <linux/slab.h> -#include <linux/pm_runtime.h> -#include <linux/workqueue.h> - -enum r_tpu_pin { R_TPU_PIN_UNUSED, R_TPU_PIN_GPIO, R_TPU_PIN_GPIO_FN }; -enum r_tpu_timer { R_TPU_TIMER_UNUSED, R_TPU_TIMER_ON }; - -struct r_tpu_priv { - struct led_classdev ldev; - void __iomem *mapbase; - struct clk *clk; - struct platform_device *pdev; - enum r_tpu_pin pin_state; - enum r_tpu_timer timer_state; - unsigned long min_rate; - unsigned int refresh_rate; - struct work_struct work; - enum led_brightness new_brightness; -}; - -static DEFINE_SPINLOCK(r_tpu_lock); - -#define TSTR -1 /* Timer start register (shared register) */ -#define TCR 0 /* Timer control register (+0x00) */ -#define TMDR 1 /* Timer mode register (+0x04) */ -#define TIOR 2 /* Timer I/O control register (+0x08) */ -#define TIER 3 /* Timer interrupt enable register (+0x0c) */ -#define TSR 4 /* Timer status register (+0x10) */ -#define TCNT 5 /* Timer counter (+0x14) */ -#define TGRA 6 /* Timer general register A (+0x18) */ -#define TGRB 7 /* Timer general register B (+0x1c) */ -#define TGRC 8 /* Timer general register C (+0x20) */ -#define TGRD 9 /* Timer general register D (+0x24) */ - -static inline u16 r_tpu_read(struct r_tpu_priv *p, int reg_nr) -{ - struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data; - void __iomem *base = p->mapbase; - unsigned long offs = reg_nr << 2; - - if (reg_nr == TSTR) - return ioread16(base - cfg->channel_offset); - - return ioread16(base + offs); -} - -static inline void r_tpu_write(struct r_tpu_priv *p, int reg_nr, u16 value) -{ - struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data; - void __iomem *base = p->mapbase; - unsigned long offs = reg_nr << 2; - - if (reg_nr == TSTR) { - iowrite16(value, base - cfg->channel_offset); - return; - } - - iowrite16(value, base + offs); -} - -static void r_tpu_start_stop_ch(struct r_tpu_priv *p, int start) -{ - struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data; - unsigned long flags; - u16 value; - - /* start stop register shared by multiple timer channels */ - spin_lock_irqsave(&r_tpu_lock, flags); - value = r_tpu_read(p, TSTR); - - if (start) - value |= 1 << cfg->timer_bit; - else - value &= ~(1 << cfg->timer_bit); - - r_tpu_write(p, TSTR, value); - spin_unlock_irqrestore(&r_tpu_lock, flags); -} - -static int r_tpu_enable(struct r_tpu_priv *p, enum led_brightness brightness) -{ - struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data; - int prescaler[] = { 1, 4, 16, 64 }; - int k, ret; - unsigned long rate, tmp; - - if (p->timer_state == R_TPU_TIMER_ON) - return 0; - - /* wake up device and enable clock */ - pm_runtime_get_sync(&p->pdev->dev); - ret = clk_enable(p->clk); - if (ret) { - dev_err(&p->pdev->dev, "cannot enable clock\n"); - return ret; - } - - /* make sure channel is disabled */ - r_tpu_start_stop_ch(p, 0); - - /* get clock rate after enabling it */ - rate = clk_get_rate(p->clk); - - /* pick the lowest acceptable rate */ - for (k = ARRAY_SIZE(prescaler) - 1; k >= 0; k--) - if ((rate / prescaler[k]) >= p->min_rate) - break; - - if (k < 0) { - dev_err(&p->pdev->dev, "clock rate mismatch\n"); - goto err0; - } - dev_dbg(&p->pdev->dev, "rate = %lu, prescaler %u\n", - rate, prescaler[k]); - - /* clear TCNT on TGRB match, count on rising edge, set prescaler */ - r_tpu_write(p, TCR, 0x0040 | k); - - /* output 0 until TGRA, output 1 until TGRB */ - r_tpu_write(p, TIOR, 0x0002); - - rate /= prescaler[k] * p->refresh_rate; - r_tpu_write(p, TGRB, rate); - dev_dbg(&p->pdev->dev, "TRGB = 0x%04lx\n", rate); - - tmp = (cfg->max_brightness - brightness) * rate; - r_tpu_write(p, TGRA, tmp / cfg->max_brightness); - dev_dbg(&p->pdev->dev, "TRGA = 0x%04lx\n", tmp / cfg->max_brightness); - - /* PWM mode */ - r_tpu_write(p, TMDR, 0x0002); - - /* enable channel */ - r_tpu_start_stop_ch(p, 1); - - p->timer_state = R_TPU_TIMER_ON; - return 0; - err0: - clk_disable(p->clk); - pm_runtime_put_sync(&p->pdev->dev); - return -ENOTSUPP; -} - -static void r_tpu_disable(struct r_tpu_priv *p) -{ - if (p->timer_state == R_TPU_TIMER_UNUSED) - return; - - /* disable channel */ - r_tpu_start_stop_ch(p, 0); - - /* stop clock and mark device as idle */ - clk_disable(p->clk); - pm_runtime_put_sync(&p->pdev->dev); - - p->timer_state = R_TPU_TIMER_UNUSED; -} - -static void r_tpu_set_pin(struct r_tpu_priv *p, enum r_tpu_pin new_state, - enum led_brightness brightness) -{ - struct led_renesas_tpu_config *cfg = p->pdev->dev.platform_data; - - if (p->pin_state == new_state) { - if (p->pin_state == R_TPU_PIN_GPIO) - gpio_set_value(cfg->pin_gpio, brightness); - return; - } - - if (p->pin_state == R_TPU_PIN_GPIO) - gpio_free(cfg->pin_gpio); - - if (p->pin_state == R_TPU_PIN_GPIO_FN) - gpio_free(cfg->pin_gpio_fn); - - if (new_state == R_TPU_PIN_GPIO) - gpio_request_one(cfg->pin_gpio, !!brightness ? - GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW, - cfg->name); - - if (new_state == R_TPU_PIN_GPIO_FN) - gpio_request(cfg->pin_gpio_fn, cfg->name); - - p->pin_state = new_state; -} - -static void r_tpu_work(struct work_struct *work) -{ - struct r_tpu_priv *p = container_of(work, struct r_tpu_priv, work); - enum led_brightness brightness = p->new_brightness; - - r_tpu_disable(p); - - /* off and maximum are handled as GPIO pins, in between PWM */ - if ((brightness == 0) || (brightness == p->ldev.max_brightness)) - r_tpu_set_pin(p, R_TPU_PIN_GPIO, brightness); - else { - r_tpu_set_pin(p, R_TPU_PIN_GPIO_FN, 0); - r_tpu_enable(p, brightness); - } -} - -static void r_tpu_set_brightness(struct led_classdev *ldev, - enum led_brightness brightness) -{ - struct r_tpu_priv *p = container_of(ldev, struct r_tpu_priv, ldev); - p->new_brightness = brightness; - schedule_work(&p->work); -} - -static int r_tpu_probe(struct platform_device *pdev) -{ - struct led_renesas_tpu_config *cfg = pdev->dev.platform_data; - struct r_tpu_priv *p; - struct resource *res; - int ret; - - if (!cfg) { - dev_err(&pdev->dev, "missing platform data\n"); - return -ENODEV; - } - - p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL); - if (p == NULL) { - dev_err(&pdev->dev, "failed to allocate driver data\n"); - return -ENOMEM; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "failed to get I/O memory\n"); - return -ENXIO; - } - - /* map memory, let mapbase point to our channel */ - p->mapbase = devm_ioremap_nocache(&pdev->dev, res->start, - resource_size(res)); - if (p->mapbase == NULL) { - dev_err(&pdev->dev, "failed to remap I/O memory\n"); - return -ENXIO; - } - - /* get hold of clock */ - p->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(p->clk)) { - dev_err(&pdev->dev, "cannot get clock\n"); - return PTR_ERR(p->clk); - } - - p->pdev = pdev; - p->pin_state = R_TPU_PIN_UNUSED; - p->timer_state = R_TPU_TIMER_UNUSED; - p->refresh_rate = cfg->refresh_rate ? cfg->refresh_rate : 100; - r_tpu_set_pin(p, R_TPU_PIN_GPIO, LED_OFF); - platform_set_drvdata(pdev, p); - - INIT_WORK(&p->work, r_tpu_work); - - p->ldev.name = cfg->name; - p->ldev.brightness = LED_OFF; - p->ldev.max_brightness = cfg->max_brightness; - p->ldev.brightness_set = r_tpu_set_brightness; - p->ldev.flags |= LED_CORE_SUSPENDRESUME; - ret = led_classdev_register(&pdev->dev, &p->ldev); - if (ret < 0) - goto err0; - - /* max_brightness may be updated by the LED core code */ - p->min_rate = p->ldev.max_brightness * p->refresh_rate; - - pm_runtime_enable(&pdev->dev); - return 0; - - err0: - r_tpu_set_pin(p, R_TPU_PIN_UNUSED, LED_OFF); - return ret; -} - -static int r_tpu_remove(struct platform_device *pdev) -{ - struct r_tpu_priv *p = platform_get_drvdata(pdev); - - r_tpu_set_brightness(&p->ldev, LED_OFF); - led_classdev_unregister(&p->ldev); - cancel_work_sync(&p->work); - r_tpu_disable(p); - r_tpu_set_pin(p, R_TPU_PIN_UNUSED, LED_OFF); - - pm_runtime_disable(&pdev->dev); - - return 0; -} - -static struct platform_driver r_tpu_device_driver = { - .probe = r_tpu_probe, - .remove = r_tpu_remove, - .driver = { - .name = "leds-renesas-tpu", - } -}; - -module_platform_driver(r_tpu_device_driver); - -MODULE_AUTHOR("Magnus Damm"); -MODULE_DESCRIPTION("Renesas TPU LED Driver"); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index d5ab6583f440..d4a7a351d67c 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -425,6 +425,25 @@ config BACKLIGHT_AS3711 If you have an Austrian Microsystems AS3711 say Y to enable the backlight driver. +config BACKLIGHT_GPIO + tristate "Generic GPIO based Backlight Driver" + depends on GPIOLIB + help + If you have a LCD backlight adjustable by GPIO, say Y to enable + this driver. + +config BACKLIGHT_LV5207LP + tristate "Sanyo LV5207LP Backlight" + depends on I2C + help + If you have a Sanyo LV5207LP say Y to enable the backlight driver. + +config BACKLIGHT_BD6107 + tristate "Rohm BD6107 Backlight" + depends on I2C + help + If you have a Rohm BD6107 say Y to enable the backlight driver. + endif # BACKLIGHT_CLASS_DEVICE endif # BACKLIGHT_LCD_SUPPORT diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 92711fe60464..38e1babb1946 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -26,12 +26,14 @@ obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o obj-$(CONFIG_BACKLIGHT_APPLE) += apple_bl.o obj-$(CONFIG_BACKLIGHT_AS3711) += as3711_bl.o obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o +obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o obj-$(CONFIG_BACKLIGHT_DA9052) += da9052_bl.o obj-$(CONFIG_BACKLIGHT_EP93XX) += ep93xx_bl.o obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o +obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o @@ -40,6 +42,7 @@ obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o +obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o diff --git a/drivers/video/backlight/bd6107.c b/drivers/video/backlight/bd6107.c new file mode 100644 index 000000000000..15e3294b29fe --- /dev/null +++ b/drivers/video/backlight/bd6107.c @@ -0,0 +1,213 @@ +/* + * ROHM Semiconductor BD6107 LED Driver + * + * Copyright (C) 2013 Ideas on board SPRL + * + * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/fb.h> +#include <linux/gpio.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/platform_data/bd6107.h> +#include <linux/slab.h> + +#define BD6107_PSCNT1 0x00 +#define BD6107_PSCNT1_PSCNTREG2 (1 << 2) +#define BD6107_PSCNT1_PSCNTREG1 (1 << 0) +#define BD6107_REGVSET 0x02 +#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) +#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) +#define BD6107_LEDCNT1 0x03 +#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) +#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) +#define BD6107_PORTSEL 0x04 +#define BD6107_PORTSEL_LEDM(n) (1 << (n)) +#define BD6107_RGB1CNT1 0x05 +#define BD6107_RGB1CNT2 0x06 +#define BD6107_RGB1CNT3 0x07 +#define BD6107_RGB1CNT4 0x08 +#define BD6107_RGB1CNT5 0x09 +#define BD6107_RGB1FLM 0x0a +#define BD6107_RGB2CNT1 0x0b +#define BD6107_RGB2CNT2 0x0c +#define BD6107_RGB2CNT3 0x0d +#define BD6107_RGB2CNT4 0x0e +#define BD6107_RGB2CNT5 0x0f +#define BD6107_RGB2FLM 0x10 +#define BD6107_PSCONT3 0x11 +#define BD6107_SMMONCNT 0x12 +#define BD6107_DCDCCNT 0x13 +#define BD6107_IOSEL 0x14 +#define BD6107_OUT1 0x15 +#define BD6107_OUT2 0x16 +#define BD6107_MASK1 0x17 +#define BD6107_MASK2 0x18 +#define BD6107_FACTOR1 0x19 +#define BD6107_FACTOR2 0x1a +#define BD6107_CLRFACT1 0x1b +#define BD6107_CLRFACT2 0x1c +#define BD6107_STATE1 0x1d +#define BD6107_LSIVER 0x1e +#define BD6107_GRPSEL 0x1f +#define BD6107_LEDCNT2 0x20 +#define BD6107_LEDCNT3 0x21 +#define BD6107_MCURRENT 0x22 +#define BD6107_MAINCNT1 0x23 +#define BD6107_MAINCNT2 0x24 +#define BD6107_SLOPECNT 0x25 +#define BD6107_MSLOPE 0x26 +#define BD6107_RGBSLOPE 0x27 +#define BD6107_TEST 0x29 +#define BD6107_SFTRST 0x2a +#define BD6107_SFTRSTGD 0x2b + +struct bd6107 { + struct i2c_client *client; + struct backlight_device *backlight; + struct bd6107_platform_data *pdata; +}; + +static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) +{ + return i2c_smbus_write_byte_data(bd->client, reg, data); +} + +static int bd6107_backlight_update_status(struct backlight_device *backlight) +{ + struct bd6107 *bd = bl_get_data(backlight); + int brightness = backlight->props.brightness; + + if (backlight->props.power != FB_BLANK_UNBLANK || + backlight->props.fb_blank != FB_BLANK_UNBLANK || + backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + if (brightness) { + bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | + BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); + bd6107_write(bd, BD6107_MAINCNT1, brightness); + bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); + } else { + gpio_set_value(bd->pdata->reset, 0); + msleep(24); + gpio_set_value(bd->pdata->reset, 1); + } + + return 0; +} + +static int bd6107_backlight_get_brightness(struct backlight_device *backlight) +{ + return backlight->props.brightness; +} + +static int bd6107_backlight_check_fb(struct backlight_device *backlight, + struct fb_info *info) +{ + struct bd6107 *bd = bl_get_data(backlight); + + return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; +} + +static const struct backlight_ops bd6107_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = bd6107_backlight_update_status, + .get_brightness = bd6107_backlight_get_brightness, + .check_fb = bd6107_backlight_check_fb, +}; + +static int bd6107_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct bd6107_platform_data *pdata = client->dev.platform_data; + struct backlight_device *backlight; + struct backlight_properties props; + struct bd6107 *bd; + int ret; + + if (pdata == NULL || !pdata->reset) { + dev_err(&client->dev, "No reset GPIO in platform data\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_warn(&client->dev, + "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); + return -EIO; + } + + bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); + if (!bd) + return -ENOMEM; + + bd->client = client; + bd->pdata = pdata; + + ret = devm_gpio_request_one(&client->dev, pdata->reset, + GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset"); + if (ret < 0) { + dev_err(&client->dev, "unable to request reset GPIO\n"); + return ret; + } + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = 128; + props.brightness = clamp_t(unsigned int, pdata->def_value, 0, + props.max_brightness); + + backlight = backlight_device_register(dev_name(&client->dev), + &bd->client->dev, bd, + &bd6107_backlight_ops, &props); + if (IS_ERR(backlight)) { + dev_err(&client->dev, "failed to register backlight\n"); + return PTR_ERR(backlight); + } + + backlight_update_status(backlight); + i2c_set_clientdata(client, backlight); + + return 0; +} + +static int bd6107_remove(struct i2c_client *client) +{ + struct backlight_device *backlight = i2c_get_clientdata(client); + + backlight->props.brightness = 0; + backlight_update_status(backlight); + backlight_device_unregister(backlight); + + return 0; +} + +static const struct i2c_device_id bd6107_ids[] = { + { "bd6107", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, bd6107_ids); + +static struct i2c_driver bd6107_driver = { + .driver = { + .name = "bd6107", + }, + .probe = bd6107_probe, + .remove = bd6107_remove, + .id_table = bd6107_ids, +}; + +module_i2c_driver(bd6107_driver); + +MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c new file mode 100644 index 000000000000..5fa217f9f445 --- /dev/null +++ b/drivers/video/backlight/gpio_backlight.c @@ -0,0 +1,133 @@ +/* + * gpio_backlight.c - Simple GPIO-controlled backlight + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/backlight.h> +#include <linux/err.h> +#include <linux/fb.h> +#include <linux/gpio.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_data/gpio_backlight.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +struct gpio_backlight { + struct device *dev; + struct device *fbdev; + + int gpio; + int active; +}; + +static int gpio_backlight_update_status(struct backlight_device *bl) +{ + struct gpio_backlight *gbl = bl_get_data(bl); + int brightness = bl->props.brightness; + + if (bl->props.power != FB_BLANK_UNBLANK || + bl->props.fb_blank != FB_BLANK_UNBLANK || + bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + gpio_set_value(gbl->gpio, brightness ? gbl->active : !gbl->active); + + return 0; +} + +static int gpio_backlight_get_brightness(struct backlight_device *bl) +{ + return bl->props.brightness; +} + +static int gpio_backlight_check_fb(struct backlight_device *bl, + struct fb_info *info) +{ + struct gpio_backlight *gbl = bl_get_data(bl); + + return gbl->fbdev == NULL || gbl->fbdev == info->dev; +} + +static const struct backlight_ops gpio_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = gpio_backlight_update_status, + .get_brightness = gpio_backlight_get_brightness, + .check_fb = gpio_backlight_check_fb, +}; + +static int gpio_backlight_probe(struct platform_device *pdev) +{ + struct gpio_backlight_platform_data *pdata = pdev->dev.platform_data; + struct backlight_properties props; + struct backlight_device *bl; + struct gpio_backlight *gbl; + int ret; + + if (!pdata) { + dev_err(&pdev->dev, "failed to find platform data\n"); + return -ENODEV; + } + + gbl = devm_kzalloc(&pdev->dev, sizeof(*gbl), GFP_KERNEL); + if (gbl == NULL) + return -ENOMEM; + + gbl->dev = &pdev->dev; + gbl->fbdev = pdata->fbdev; + gbl->gpio = pdata->gpio; + gbl->active = pdata->active_low ? 0 : 1; + + ret = devm_gpio_request_one(gbl->dev, gbl->gpio, GPIOF_DIR_OUT | + (gbl->active ? GPIOF_INIT_LOW + : GPIOF_INIT_HIGH), + pdata->name); + if (ret < 0) { + dev_err(&pdev->dev, "unable to request GPIO\n"); + return ret; + } + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = 1; + bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, gbl, + &gpio_backlight_ops, &props); + if (IS_ERR(bl)) { + dev_err(&pdev->dev, "failed to register backlight\n"); + return PTR_ERR(bl); + } + + bl->props.brightness = pdata->def_value; + backlight_update_status(bl); + + platform_set_drvdata(pdev, bl); + return 0; +} + +static int gpio_backlight_remove(struct platform_device *pdev) +{ + struct backlight_device *bl = platform_get_drvdata(pdev); + + backlight_device_unregister(bl); + return 0; +} + +static struct platform_driver gpio_backlight_driver = { + .driver = { + .name = "gpio-backlight", + .owner = THIS_MODULE, + }, + .probe = gpio_backlight_probe, + .remove = gpio_backlight_remove, +}; + +module_platform_driver(gpio_backlight_driver); + +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_DESCRIPTION("GPIO-based Backlight Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:gpio-backlight"); diff --git a/drivers/video/backlight/lv5207lp.c b/drivers/video/backlight/lv5207lp.c new file mode 100644 index 000000000000..498fd73d59b9 --- /dev/null +++ b/drivers/video/backlight/lv5207lp.c @@ -0,0 +1,171 @@ +/* + * Sanyo LV5207LP LED Driver + * + * Copyright (C) 2013 Ideas on board SPRL + * + * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/backlight.h> +#include <linux/err.h> +#include <linux/fb.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/platform_data/lv5207lp.h> +#include <linux/slab.h> + +#define LV5207LP_CTRL1 0x00 +#define LV5207LP_CPSW (1 << 7) +#define LV5207LP_SCTEN (1 << 6) +#define LV5207LP_C10 (1 << 5) +#define LV5207LP_CKSW (1 << 4) +#define LV5207LP_RSW (1 << 3) +#define LV5207LP_GSW (1 << 2) +#define LV5207LP_BSW (1 << 1) +#define LV5207LP_CTRL2 0x01 +#define LV5207LP_MSW (1 << 7) +#define LV5207LP_MLED4 (1 << 6) +#define LV5207LP_RED 0x02 +#define LV5207LP_GREEN 0x03 +#define LV5207LP_BLUE 0x04 + +#define LV5207LP_MAX_BRIGHTNESS 32 + +struct lv5207lp { + struct i2c_client *client; + struct backlight_device *backlight; + struct lv5207lp_platform_data *pdata; +}; + +static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data) +{ + return i2c_smbus_write_byte_data(lv->client, reg, data); +} + +static int lv5207lp_backlight_update_status(struct backlight_device *backlight) +{ + struct lv5207lp *lv = bl_get_data(backlight); + int brightness = backlight->props.brightness; + + if (backlight->props.power != FB_BLANK_UNBLANK || + backlight->props.fb_blank != FB_BLANK_UNBLANK || + backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + if (brightness) { + lv5207lp_write(lv, LV5207LP_CTRL1, + LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW); + lv5207lp_write(lv, LV5207LP_CTRL2, + LV5207LP_MSW | LV5207LP_MLED4 | + (brightness - 1)); + } else { + lv5207lp_write(lv, LV5207LP_CTRL1, 0); + lv5207lp_write(lv, LV5207LP_CTRL2, 0); + } + + return 0; +} + +static int lv5207lp_backlight_get_brightness(struct backlight_device *backlight) +{ + return backlight->props.brightness; +} + +static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, + struct fb_info *info) +{ + struct lv5207lp *lv = bl_get_data(backlight); + + return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev; +} + +static const struct backlight_ops lv5207lp_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = lv5207lp_backlight_update_status, + .get_brightness = lv5207lp_backlight_get_brightness, + .check_fb = lv5207lp_backlight_check_fb, +}; + +static int lv5207lp_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct lv5207lp_platform_data *pdata = client->dev.platform_data; + struct backlight_device *backlight; + struct backlight_properties props; + struct lv5207lp *lv; + + if (pdata == NULL) { + dev_err(&client->dev, "No platform data supplied\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_warn(&client->dev, + "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); + return -EIO; + } + + lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL); + if (!lv) + return -ENOMEM; + + lv->client = client; + lv->pdata = pdata; + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = min_t(unsigned int, pdata->max_value, + LV5207LP_MAX_BRIGHTNESS); + props.brightness = clamp_t(unsigned int, pdata->def_value, 0, + props.max_brightness); + + backlight = backlight_device_register(dev_name(&client->dev), + &lv->client->dev, lv, + &lv5207lp_backlight_ops, &props); + if (IS_ERR(backlight)) { + dev_err(&client->dev, "failed to register backlight\n"); + return PTR_ERR(backlight); + } + + backlight_update_status(backlight); + i2c_set_clientdata(client, backlight); + + return 0; +} + +static int lv5207lp_remove(struct i2c_client *client) +{ + struct backlight_device *backlight = i2c_get_clientdata(client); + + backlight->props.brightness = 0; + backlight_update_status(backlight); + backlight_device_unregister(backlight); + + return 0; +} + +static const struct i2c_device_id lv5207lp_ids[] = { + { "lv5207lp", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lv5207lp_ids); + +static struct i2c_driver lv5207lp_driver = { + .driver = { + .name = "lv5207lp", + }, + .probe = lv5207lp_probe, + .remove = lv5207lp_remove, + .id_table = lv5207lp_ids, +}; + +module_i2c_driver(lv5207lp_driver); + +MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_LICENSE("GPL"); |