diff options
author | Imre Kaloz <kaloz@openwrt.org> | 2010-02-22 13:54:47 +0000 |
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committer | Imre Kaloz <kaloz@openwrt.org> | 2010-02-22 13:54:47 +0000 |
commit | 212a481ea99ac04e2d3415cf3627362ead9a277d (patch) | |
tree | 1bbe491ef9470b8edd7be199072539d7e18a1996 /target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c | |
parent | 73f82eb93e48c01ee58eb27031e204332da54cd8 (diff) | |
download | upstream-212a481ea99ac04e2d3415cf3627362ead9a277d.tar.gz upstream-212a481ea99ac04e2d3415cf3627362ead9a277d.tar.bz2 upstream-212a481ea99ac04e2d3415cf3627362ead9a277d.zip |
[ubicom32]: move new files out from platform support patch
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
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, 399 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c b/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c new file mode 100644 index 0000000000..99538c341c --- /dev/null +++ b/target/linux/ubicom32/files/drivers/video/backlight/ubicom32bl.c @@ -0,0 +1,399 @@ +/* + * 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"); |