diff options
Diffstat (limited to 'drivers/misc/ab8500-pwm.c')
| -rw-r--r-- | drivers/misc/ab8500-pwm.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/drivers/misc/ab8500-pwm.c b/drivers/misc/ab8500-pwm.c deleted file mode 100644 index d7a9aa14e5d..00000000000 --- a/drivers/misc/ab8500-pwm.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * Copyright (C) ST-Ericsson SA 2010 - * - * Author: Arun R Murthy <arun.murthy@stericsson.com> - * License terms: GNU General Public License (GPL) version 2 - */ -#include <linux/err.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/pwm.h> -#include <linux/mfd/abx500.h> -#include <linux/mfd/abx500/ab8500.h> -#include <linux/module.h> - -/* - * PWM Out generators - * Bank: 0x10 - */ -#define AB8500_PWM_OUT_CTRL1_REG 0x60 -#define AB8500_PWM_OUT_CTRL2_REG 0x61 -#define AB8500_PWM_OUT_CTRL7_REG 0x66 - -/* backlight driver constants */ -#define ENABLE_PWM 1 -#define DISABLE_PWM 0 - -struct pwm_device { - struct device *dev; - struct list_head node; - const char *label; - unsigned int pwm_id; -}; - -static LIST_HEAD(pwm_list); - -int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) -{ - int ret = 0; - unsigned int higher_val, lower_val; - u8 reg; - - /* - * get the first 8 bits that are be written to - * AB8500_PWM_OUT_CTRL1_REG[0:7] - */ - lower_val = duty_ns & 0x00FF; - /* - * get bits [9:10] that are to be written to - * AB8500_PWM_OUT_CTRL2_REG[0:1] - */ - higher_val = ((duty_ns & 0x0300) >> 8); - - reg = AB8500_PWM_OUT_CTRL1_REG + ((pwm->pwm_id - 1) * 2); - - ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC, - reg, (u8)lower_val); - if (ret < 0) - return ret; - ret = abx500_set_register_interruptible(pwm->dev, AB8500_MISC, - (reg + 1), (u8)higher_val); - - return ret; -} -EXPORT_SYMBOL(pwm_config); - -int pwm_enable(struct pwm_device *pwm) -{ - int ret; - - ret = abx500_mask_and_set_register_interruptible(pwm->dev, - AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, - 1 << (pwm->pwm_id-1), ENABLE_PWM); - if (ret < 0) - dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n", - pwm->label, ret); - return ret; -} -EXPORT_SYMBOL(pwm_enable); - -void pwm_disable(struct pwm_device *pwm) -{ - int ret; - - ret = abx500_mask_and_set_register_interruptible(pwm->dev, - AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, - 1 << (pwm->pwm_id-1), DISABLE_PWM); - if (ret < 0) - dev_err(pwm->dev, "%s: Failed to disable PWM, Error %d\n", - pwm->label, ret); - return; -} -EXPORT_SYMBOL(pwm_disable); - -struct pwm_device *pwm_request(int pwm_id, const char *label) -{ - struct pwm_device *pwm; - - list_for_each_entry(pwm, &pwm_list, node) { - if (pwm->pwm_id == pwm_id) { - pwm->label = label; - pwm->pwm_id = pwm_id; - return pwm; - } - } - - return ERR_PTR(-ENOENT); -} -EXPORT_SYMBOL(pwm_request); - -void pwm_free(struct pwm_device *pwm) -{ - pwm_disable(pwm); -} -EXPORT_SYMBOL(pwm_free); - -static int __devinit ab8500_pwm_probe(struct platform_device *pdev) -{ - struct pwm_device *pwm; - /* - * Nothing to be done in probe, this is required to get the - * device which is required for ab8500 read and write - */ - pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL); - if (pwm == NULL) { - dev_err(&pdev->dev, "failed to allocate memory\n"); - return -ENOMEM; - } - pwm->dev = &pdev->dev; - pwm->pwm_id = pdev->id; - list_add_tail(&pwm->node, &pwm_list); - platform_set_drvdata(pdev, pwm); - dev_dbg(pwm->dev, "pwm probe successful\n"); - return 0; -} - -static int __devexit ab8500_pwm_remove(struct platform_device *pdev) -{ - struct pwm_device *pwm = platform_get_drvdata(pdev); - list_del(&pwm->node); - dev_dbg(&pdev->dev, "pwm driver removed\n"); - kfree(pwm); - return 0; -} - -static struct platform_driver ab8500_pwm_driver = { - .driver = { - .name = "ab8500-pwm", - .owner = THIS_MODULE, - }, - .probe = ab8500_pwm_probe, - .remove = __devexit_p(ab8500_pwm_remove), -}; - -static int __init ab8500_pwm_init(void) -{ - return platform_driver_register(&ab8500_pwm_driver); -} - -static void __exit ab8500_pwm_exit(void) -{ - platform_driver_unregister(&ab8500_pwm_driver); -} - -subsys_initcall(ab8500_pwm_init); -module_exit(ab8500_pwm_exit); -MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>"); -MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); -MODULE_ALIAS("platform:ab8500-pwm"); -MODULE_LICENSE("GPL v2"); |