litmus-rt.git - The LITMUS^RT kernel.

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author	David S. Miller <davem@davemloft.net>	2006-05-23 05:07:22 -0400
committer	David S. Miller <davem@davemloft.net>	2006-05-23 05:07:22 -0400
commit	42f142371e48fbc44956d57b4e506bb6ce673cd7 (patch)
tree	cbcf77d8bf8adc923c50e1fd53a8becd81952beb /drivers/rtc/rtc-ds1672.c
parent	353b28bafd1b962359a866ff263a7fad833d29a1 (diff)

[SPARC64]: Respect gfp_t argument to dma_alloc_coherent().

Using asm-generic/dma-mapping.h does not work because pushing the call down to pci_alloc_coherent() causes the gfp_t argument of dma_alloc_coherent() to be ignored. Fix this by implementing things directly, and adding a gfp_t argument we can use in the internal call down to the PCI DMA implementation of pci_alloc_coherent(). This fixes massive memory corruption when using the sound driver layer, which passes things like __GFP_COMP down into these routines and (correctly) expects that to work. Signed-off-by: David S. Miller <davem@davemloft.net>

Diffstat (limited to 'drivers/rtc/rtc-ds1672.c')

0 files changed, 0 insertions, 0 deletions

/* * pca9532.c - 16-bit Led dimmer * * Copyright (C) 2008 Riku Voipio * * 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; version 2 of the License. * * Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf * */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/leds.h> #include <linux/input.h> #include <linux/mutex.h> #include <linux/workqueue.h> #include <linux/leds-pca9532.h> static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END}; I2C_CLIENT_INSMOD_1(pca9532); #define PCA9532_REG_PSC(i) (0x2+(i)*2) #define PCA9532_REG_PWM(i) (0x3+(i)*2) #define PCA9532_REG_LS0 0x6 #define LED_REG(led) ((led>>2)+PCA9532_REG_LS0) #define LED_NUM(led) (led & 0x3) #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) struct pca9532_data { struct i2c_client *client; struct pca9532_led leds[16]; struct mutex update_lock; struct input_dev *idev; struct work_struct work; u8 pwm[2]; u8 psc[2]; }; static int pca9532_probe(struct i2c_client *client, const struct i2c_device_id *id); static int pca9532_remove(struct i2c_client *client); static const struct i2c_device_id pca9532_id[] = { { "pca9532", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, pca9532_id); static struct i2c_driver pca9532_driver = { .driver = { .name = "pca9532", }, .probe = pca9532_probe, .remove = pca9532_remove, .id_table = pca9532_id, }; /* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly, * the clever Thecus people are using one pwm to drive the beeper. So, * as a compromise we average one pwm to the values requested by all * leds that are not ON/OFF. * */ static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink, enum led_brightness value) { int a = 0, b = 0, i = 0; struct pca9532_data *data = i2c_get_clientdata(client); for (i = 0; i < 16; i++) { if (data->leds[i].type == PCA9532_TYPE_LED && data->leds[i].state == PCA9532_PWM0+pwm) { a++; b += data->leds[i].ldev.brightness; } } if (a == 0) { dev_err(&client->dev, "fear of division by zero %d/%d, wanted %d\n", b, a, value); return -EINVAL; } b = b/a; if (b > 0xFF) return -EINVAL; data->pwm[pwm] = b; data->psc[pwm] = blink; return 0; } static int pca9532_setpwm(struct i2c_client *client, int pwm) { struct pca9532_data *data = i2c_get_clientdata(client); mutex_lock(&data->update_lock); i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm), data->pwm[pwm]); i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm), data->psc[pwm]); mutex_unlock(&data->update_lock); return 0; } /* Set LED routing */ static void pca9532_setled(struct pca9532_led *led) { struct i2c_client *client = led->client; struct pca9532_data *data = i2c_get_clientdata(client); char reg; mutex_lock(&data->update_lock); reg = i2c_smbus_read_byte_data(client, LED_REG(led->id)); /* zero led bits */ reg = reg & ~(0x3<<LED_NUM(led->id)*2); /* set the new value */ reg = reg | (led->state << LED_NUM(led->id)*2); i2c_smbus_write_byte_data(client, LED_REG(led->id), reg); mutex_unlock(&data->update_lock); } static void pca9532_set_brightness(struct led_classdev *led_cdev, enum led_brightness value) { int err = 0; struct pca9532_led *led = ldev_to_led(led_cdev); if (value == LED_OFF) led->state = PCA9532_OFF; else if (value == LED_FULL) led->state = PCA9532_ON; else { led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */ err = pca9532_calcpwm(led->client, 0, 0, value); if (err) return; /* XXX: led api doesn't allow error code? */ } schedule_work(&led->work); } static int pca9532_set_blink(struct led_classdev *led_cdev, unsigned long *delay_on, unsigned long *delay_off) { struct pca9532_led *led = ldev_to_led(led_cdev); struct i2c_client *client = led->client; int psc; int err = 0; if (*delay_on == 0 && *delay_off == 0) { /* led subsystem ask us for a blink rate */ *delay_on = 1000; *delay_off = 1000; } if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6) return -EINVAL; /* Thecus specific: only use PSC/PWM 0 */ psc = (*delay_on * 152-1)/1000; err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness); if (err) return err; schedule_work(&led->work); return 0; } static int pca9532_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { struct pca9532_data *data = input_get_drvdata(dev); if (type != EV_SND && (code != SND_BELL || code != SND_TONE)) return -1; /* XXX: allow different kind of beeps with psc/pwm modifications */ if (value > 1 && value < 32767) data->pwm[1] = 127; else data->pwm[1] = 0; schedule_work(&data->work); return 0; } static void pca9532_input_work(struct work_struct *work) { struct pca9532_data *data; data = container_of(work, struct pca9532_data, work); mutex_lock(&data->update_lock); i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1), data->pwm[1]); mutex_unlock(&data->update_lock); } static void pca9532_led_work(struct work_struct *work) { struct pca9532_led *led; led = container_of(work, struct pca9532_led, work); if (led->state == PCA9532_PWM0) pca9532_setpwm(led->client, 0); pca9532_setled(led); } static int pca9532_configure(struct i2c_client *client, struct pca9532_data *data, struct pca9532_platform_data *pdata) { int i, err = 0; for (i = 0; i < 2; i++) { data->pwm[i] = pdata->pwm[i]; data->psc[i] = pdata->psc[i]; i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i), data->pwm[i]); i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i), data->psc[i]); } for (i = 0; i < 16; i++) { struct pca9532_led *led = &data->leds[i]; struct pca9532_led *pled = &pdata->leds[i]; led->client = client; led->id = i; led->type = pled->type; switch (led->type) { case PCA9532_TYPE_NONE: break; case PCA9532_TYPE_LED: led->state = pled->state; led->name = pled->name; led->ldev.name = led->name; led->ldev.brightness = LED_OFF; led->ldev.brightness_set = pca9532_set_brightness; led->ldev.blink_set = pca9532_set_blink; INIT_WORK(&led->work, pca9532_led_work); err = led_classdev_register(&client->dev, &led->ldev); if (err < 0) { dev_err(&client->dev, "couldn't register LED %s\n", led->name); goto exit; } pca9532_setled(led); break; case PCA9532_TYPE_N2100_BEEP: BUG_ON(data->idev); led->state = PCA9532_PWM1; pca9532_setled(led); data->idev = input_allocate_device(); if (data->idev == NULL) { err = -ENOMEM; goto exit; } data->idev->name = pled->name; data->idev->phys = "i2c/pca9532"; data->idev->id.bustype = BUS_HOST; data->idev->id.vendor = 0x001f; data->idev->id.product = 0x0001; data->idev->id.version = 0x0100; data->idev->evbit[0] = BIT_MASK(EV_SND); data->idev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); data->idev->event = pca9532_event; input_set_drvdata(data->idev, data); INIT_WORK(&data->work, pca9532_input_work); err = input_register_device(data->idev); if (err) { input_free_device(data->idev); cancel_work_sync(&data->work); data->idev = NULL; goto exit; } break; } } return 0; exit: if (i > 0) for (i = i - 1; i >= 0; i--) switch (data->leds[i].type) { case PCA9532_TYPE_NONE: break; case PCA9532_TYPE_LED: led_classdev_unregister(&data->leds[i].ldev); cancel_work_sync(&data->leds[i].work); break; case PCA9532_TYPE_N2100_BEEP: if (data->idev != NULL) { input_unregister_device(data->idev); input_free_device(data->idev); cancel_work_sync(&data->work); data->idev = NULL; } break; } return err; } static int pca9532_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct pca9532_data *data = i2c_get_clientdata(client); struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data; int err; if (!pca9532_pdata) return -EIO; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -EIO; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; dev_info(&client->dev, "setting platform data\n"); i2c_set_clientdata(client, data); data->client = client; mutex_init(&data->update_lock); err = pca9532_configure(client, data, pca9532_pdata); if (err) { kfree(data); i2c_set_clientdata(client, NULL); } return err; } static int pca9532_remove(struct i2c_client *client) { struct pca9532_data *data = i2c_get_clientdata(client); int i; for (i = 0; i < 16; i++) switch (data->leds[i].type) { case PCA9532_TYPE_NONE: break; case PCA9532_TYPE_LED: led_classdev_unregister(&data->leds[i].ldev); cancel_work_sync(&data->leds[i].work); break; case PCA9532_TYPE_N2100_BEEP: if (data->idev != NULL) { input_unregister_device(data->idev); input_free_device(data->idev); cancel_work_sync(&data->work); data->idev = NULL; } break; } kfree(data); i2c_set_clientdata(client, NULL); return 0; } static int __init pca9532_init(void) { return i2c_add_driver(&pca9532_driver); } static void __exit pca9532_exit(void) { i2c_del_driver(&pca9532_driver); } MODULE_AUTHOR("Riku Voipio"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("PCA 9532 LED dimmer"); module_init(pca9532_init); module_exit(pca9532_exit);


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