diff options
Diffstat (limited to 'target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c')
| -rw-r--r-- | target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c | 399 |
1 files changed, 0 insertions, 399 deletions
diff --git a/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c b/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c deleted file mode 100644 index 99538c341c..0000000000 --- a/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c +++ /dev/null @@ -1,399 +0,0 @@ -/* - * drivers/video/backlight/ubicom32bl.c - * Backlight driver for the Ubicom32 platform - * - * (C) Copyright 2009, Ubicom, Inc. - * - * This file is part of the Ubicom32 Linux Kernel Port. - * - * The Ubicom32 Linux Kernel Port 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. - * - * The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not, - * see <http://www.gnu.org/licenses/>. - * - * Ubicom32 implementation derived from (with many thanks): - * arch/m68knommu - * arch/blackfin - * arch/parisc - */ -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/backlight.h> -#include <linux/fb.h> - -#include <asm/ubicom32bl.h> -#include <asm/ip5000.h> - -#define DRIVER_NAME "ubicom32bl" -#define UBICOM32BL_MAX_BRIGHTNESS 255 - -struct ubicom32bl_data { - /* - * Pointer to the platform data structure. Keep this around since we need values - * from it to set the backlight intensity. - */ - const struct ubicom32bl_platform_data *pdata; - - /* - * Backlight device, we have to save this for use when we remove ourselves. - */ - struct backlight_device *bldev; - - /* - * Current intensity, used for get_intensity. - */ - int cur_intensity; - - /* - * Init function for PWM - */ - int (*init_fn)(struct ubicom32bl_data *); - - /* - * Set intensity function depending on the backlight type - */ - int (*set_intensity_fn)(struct ubicom32bl_data *, int); -}; - -/* - * ubicom32bl_set_intensity_gpio - */ -static int ubicom32bl_set_intensity_gpio(struct ubicom32bl_data *ud, int intensity) -{ - ud->cur_intensity = intensity ? 255 : 0; - - if (intensity) { - // set gpio - return 0; - } - - // clear gpio - return 0; -} - -/* - * ubicom32bl_set_intensity_hw - */ -static int ubicom32bl_set_intensity_hw(struct ubicom32bl_data *ud, int intensity) -{ - u16_t period = ud->pdata->pwm_period; - u16_t duty; - - /* - * Calculate the new duty cycle - */ - duty = (period * intensity) / (UBICOM32BL_MAX_BRIGHTNESS + 1); - - /* - * Set the new duty cycle - */ - switch (ud->pdata->pwm_channel) { - case 0: - /* - * Channel 0 is in the lower half of PORT C ctl0 and ctl1 - */ - UBICOM32_IO_PORT(RC)->ctl1 = (ud->pdata->pwm_period << 16) | duty; - break; - - case 1: - /* - * Channel 1 is in the upper half of PORT C ctl0 and ctl2 - */ - UBICOM32_IO_PORT(RC)->ctl2 = (ud->pdata->pwm_period << 16) | duty; - break; - - case 2: - /* - * Channel 2 is in PORT H ctl0 and ctl1 - */ - UBICOM32_IO_PORT(RH)->ctl1 = (ud->pdata->pwm_period << 16) | duty; - break; - } - - ud->cur_intensity = intensity; - - return 0; -} - -/* - * ubicom32bl_set_intensity - */ -static int ubicom32bl_set_intensity(struct backlight_device *bd) -{ - struct ubicom32bl_data *ud = (struct ubicom32bl_data *)bl_get_data(bd); - int intensity = bd->props.brightness; - - /* - * If we're blanked the the intensity doesn't matter. - */ - if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) { - intensity = 0; - } - - /* - * Check for inverted backlight. - */ - if (ud->pdata->invert) { - intensity = UBICOM32BL_MAX_BRIGHTNESS - intensity; - } - - if (ud->set_intensity_fn) { - return ud->set_intensity_fn(ud, intensity); - } - - return -ENXIO; -} - -/* - * ubicom32bl_get_intensity - * Return the current intensity of the backlight. - */ -static int ubicom32bl_get_intensity(struct backlight_device *bd) -{ - struct ubicom32bl_data *ud = (struct ubicom32bl_data *)bl_get_data(bd); - - return ud->cur_intensity; -} - -/* - * ubicom32bl_init_hw_pwm - * Set the appropriate PWM registers - */ -static int ubicom32bl_init_hw_pwm(struct ubicom32bl_data *ud) -{ - /* - * bit 13: enable - */ - u16_t pwm_cfg = (1 << 13) | (ud->pdata->pwm_prescale << 8) ; - - switch (ud->pdata->pwm_channel) { - case 0: - /* - * Channel 0 is in the lower half of PORT C ctl0 and ctl1 (PA5) - */ - UBICOM32_IO_PORT(RC)->ctl0 &= ~0xFFFF; - UBICOM32_IO_PORT(RC)->ctl0 |= pwm_cfg; - UBICOM32_IO_PORT(RC)->ctl1 = ud->pdata->pwm_period << 16; - - /* - * If the port function is not set, set it to GPIO/PWM - */ - if (!UBICOM32_IO_PORT(RA)->function) { - UBICOM32_IO_PORT(RA)->function = 3; - } - break; - - case 1: - /* - * Channel 1 is in the upper half of PORT C ctl0 and ctl2 (PE4) - */ - UBICOM32_IO_PORT(RC)->ctl0 &= ~0xFFFF0000; - UBICOM32_IO_PORT(RC)->ctl0 |= (pwm_cfg << 16); - UBICOM32_IO_PORT(RC)->ctl2 = ud->pdata->pwm_period << 16; - - /* - * If the port function is not set, set it to GPIO/ExtIOInt - */ - if (!UBICOM32_IO_PORT(RE)->function) { - UBICOM32_IO_PORT(RE)->function = 3; - } - break; - - case 2: - /* - * Channel 2 is in PORT H ctl0 and ctl1 (PD0) - */ - UBICOM32_IO_PORT(RH)->ctl0 &= ~0xFFFF0000; - UBICOM32_IO_PORT(RH)->ctl0 = pwm_cfg; - UBICOM32_IO_PORT(RH)->ctl1 = ud->pdata->pwm_period << 16; - - /* - * If the port function is not set, set it to GPIO - */ - if (!UBICOM32_IO_PORT(RD)->function) { - UBICOM32_IO_PORT(RD)->function = 3; - } - break; - } - - return 0; -} - -/* - * ubicom32bl_init_gpio - * Allocate the appropriate GPIO - */ -static int ubicom32bl_init_gpio(struct ubicom32bl_data *ud) -{ - return 0; -} - -static struct backlight_ops ubicom32bl_ops = { - .get_brightness = ubicom32bl_get_intensity, - .update_status = ubicom32bl_set_intensity, -}; - -/* - * ubicom32bl_probe - */ -static int ubicom32bl_probe(struct platform_device *pdev) -{ - const struct ubicom32bl_platform_data *pdata = pdev->dev.platform_data; - struct ubicom32bl_data *ud; - struct backlight_device *bldev; - int retval; - - /* - * Check to see if we have any platform data, if we don't then the backlight is not - * configured on this device. - */ - if (!pdata) { - return -ENODEV; - } - - /* - * Allocate our private data - */ - ud = kzalloc(sizeof(struct ubicom32bl_data), GFP_KERNEL); - if (!ud) { - return -ENOMEM; - } - - ud->pdata = pdata; - - /* - * Check to see that the platform data is valid for this driver - */ - switch (pdata->type) { - case UBICOM32BL_TYPE_PWM: - { - /* - * Make sure we have a PWM peripheral - */ - u32_t chipid; - asm volatile ( - "move.4 %0, CHIP_ID \n\t" - : "=r" (chipid) - ); - if (chipid != 0x00030001) { - retval = -ENODEV; - goto fail; - } - - if (pdata->pwm_channel > 3) { - retval = -ENODEV; - goto fail; - } - if (pdata->pwm_prescale > 16) { - retval = -EINVAL; - goto fail; - } - - ud->init_fn = ubicom32bl_init_hw_pwm; - ud->set_intensity_fn = ubicom32bl_set_intensity_hw; - break; - } - - case UBICOM32BL_TYPE_PWM_HRT: - // For now, PWM HRT devices are treated as binary lights. - - case UBICOM32BL_TYPE_BINARY: - ud->init_fn = ubicom32bl_init_gpio; - ud->set_intensity_fn = ubicom32bl_set_intensity_gpio; - break; - } - - /* - * Register our backlight device - */ - bldev = backlight_device_register(DRIVER_NAME, &pdev->dev, ud, &ubicom32bl_ops); - if (IS_ERR(bldev)) { - retval = PTR_ERR(bldev); - goto fail; - } - - ud->bldev = bldev; - ud->cur_intensity = pdata->default_intensity; - platform_set_drvdata(pdev, ud); - - /* - * Start up the backlight at the prescribed default intensity - */ - bldev->props.power = FB_BLANK_UNBLANK; - bldev->props.max_brightness = UBICOM32BL_MAX_BRIGHTNESS; - bldev->props.brightness = pdata->default_intensity; - - if (ud->init_fn) { - if (ud->init_fn(ud) != 0) { - retval = -ENODEV; - backlight_device_unregister(ud->bldev); - goto fail; - } - } - ubicom32bl_set_intensity(bldev); - - printk(KERN_INFO DRIVER_NAME ": Backlight driver started\n"); - - return 0; - -fail: - platform_set_drvdata(pdev, NULL); - kfree(ud); - return retval; -} - -/* - * ubicom32bl_remove - */ -static int __exit ubicom32bl_remove(struct platform_device *pdev) -{ - struct ubicom32bl_data *ud = platform_get_drvdata(pdev); - - backlight_device_unregister(ud->bldev); - platform_set_drvdata(pdev, NULL); - kfree(ud); - - return 0; -} - -static struct platform_driver ubicom32bl_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, - - .remove = __exit_p(ubicom32bl_remove), -}; - -/* - * ubicom32bl_init - */ -static int __init ubicom32bl_init(void) -{ - return platform_driver_probe(&ubicom32bl_driver, ubicom32bl_probe); -} -module_init(ubicom32bl_init); - -/* - * ubicom32bl_exit - */ -static void __exit ubicom32bl_exit(void) -{ - platform_driver_unregister(&ubicom32bl_driver); -} -module_exit(ubicom32bl_exit); - -MODULE_AUTHOR("Patrick Tjin <@ubicom.com>"); -MODULE_DESCRIPTION("Ubicom32 backlight driver"); -MODULE_LICENSE("GPL"); |