diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch b/target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch new file mode 100644 index 0000000000..db88c16963 --- /dev/null +++ b/target/linux/brcm63xx/patches-2.6.35/211-nxp-74hc164-gpio-chip-driver.patch @@ -0,0 +1,279 @@ +--- a/drivers/gpio/Kconfig ++++ b/drivers/gpio/Kconfig +@@ -343,4 +343,12 @@ config GPIO_JANZ_TTL + This driver provides support for driving the pins in output + mode only. Input mode is not supported. + ++comment "Other GPIO expanders" ++ ++config GPIO_NXP_74HC164 ++ tristate "NXP 74HC164 Output expanders" ++ help ++ Platform driver for NXP 74HC164 8-output Expanders. This ++ provides a GPIO interface supporting outputs. ++ + endif +--- a/drivers/gpio/Makefile ++++ b/drivers/gpio/Makefile +@@ -17,6 +17,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o + obj-$(CONFIG_GPIO_MAX732X) += max732x.o + obj-$(CONFIG_GPIO_MC33880) += mc33880.o + obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o ++obj-$(CONFIG_GPIO_NXP_74HC164) += nxp_74hc164.o + obj-$(CONFIG_GPIO_PCA953X) += pca953x.o + obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o + obj-$(CONFIG_GPIO_PL061) += pl061.o +--- /dev/null ++++ b/drivers/gpio/nxp_74hc164.c +@@ -0,0 +1,226 @@ ++/* ++ * NXP 74HC164 - output expander GPIO driver ++ * ++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> ++ * Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.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. ++ * ++ * Copy from nxp_74hc153.c code ++ */ ++ ++#include <linux/module.h> ++#include <linux/init.h> ++#include <linux/gpio.h> ++#include <linux/bitops.h> ++#include <linux/platform_device.h> ++#include <linux/nxp_74hc164.h> ++ ++#define NXP_74HC164_NUM_GPIOS 8 ++ ++struct nxp_74hc164_chip { ++ struct device *parent; ++ struct gpio_chip gpio_chip; ++ struct mutex lock; ++ long mask; ++}; ++ ++static void nxp_74hc164_set_value(struct gpio_chip *, unsigned, int); ++ ++static struct nxp_74hc164_chip *gpio_to_nxp(struct gpio_chip *gc) ++{ ++ return container_of(gc, struct nxp_74hc164_chip, gpio_chip); ++} ++ ++static int nxp_74hc164_direction_input(struct gpio_chip *gc, unsigned offset) ++{ ++ WARN_ON(1); ++ return -EINVAL; ++} ++ ++static int nxp_74hc164_direction_output(struct gpio_chip *gc, ++ unsigned offset, int val) ++{ ++ nxp_74hc164_set_value(gc, offset, val); ++ return 0; ++} ++ ++static int nxp_74hc164_get_value(struct gpio_chip *gc, unsigned offset) ++{ ++ struct nxp_74hc164_chip *nxp = gpio_to_nxp(gc); ++ int ret; ++ ++ mutex_lock(&nxp->lock); ++ ret = test_bit(offset, &nxp->mask); ++ mutex_unlock(&nxp->lock); ++ ++ return ret; ++} ++ ++static void nxp_74hc164_set_value(struct gpio_chip *gc, ++ unsigned offset, int val) ++{ ++ struct nxp_74hc164_chip *nxp; ++ struct nxp_74hc164_platform_data *pdata; ++ long mask; ++ int refresh; ++ int i; ++ ++ nxp = gpio_to_nxp(gc); ++ pdata = nxp->parent->platform_data; ++ ++ mutex_lock(&nxp->lock); ++ if (val) ++ refresh = (test_and_set_bit(offset, &nxp->mask) != val); ++ else ++ refresh = (test_and_clear_bit(offset, &nxp->mask) != val); ++ ++ if (refresh) { ++ mask = nxp->mask; ++ for (i = 8; i > 0; --i, mask <<= 1) { ++ gpio_set_value(pdata->gpio_pin_data, mask & 0x80); ++ gpio_set_value(pdata->gpio_pin_clk, 1); ++ gpio_set_value(pdata->gpio_pin_clk, 0); ++ } ++ } ++ mutex_unlock(&nxp->lock); ++} ++ ++static int __devinit nxp_74hc164_probe(struct platform_device *pdev) ++{ ++ struct nxp_74hc164_platform_data *pdata; ++ struct nxp_74hc164_chip *nxp; ++ struct gpio_chip *gc; ++ int err; ++ ++ pdata = pdev->dev.platform_data; ++ if (pdata == NULL) { ++ dev_dbg(&pdev->dev, "no platform data specified\n"); ++ return -EINVAL; ++ } ++ ++ nxp = kzalloc(sizeof(struct nxp_74hc164_chip), GFP_KERNEL); ++ if (nxp == NULL) { ++ dev_err(&pdev->dev, "no memory for private data\n"); ++ return -ENOMEM; ++ } ++ ++ err = gpio_request(pdata->gpio_pin_clk, dev_name(&pdev->dev)); ++ if (err) { ++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n", ++ pdata->gpio_pin_clk, err); ++ goto err_free_nxp; ++ } ++ ++ err = gpio_request(pdata->gpio_pin_data, dev_name(&pdev->dev)); ++ if (err) { ++ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n", ++ pdata->gpio_pin_data, err); ++ goto err_free_clk; ++ } ++ ++ err = gpio_direction_output(pdata->gpio_pin_clk, 0); ++ if (err) { ++ dev_err(&pdev->dev, ++ "unable to set direction of gpio %u, err=%d\n", ++ pdata->gpio_pin_clk, err); ++ goto err_free_data; ++ } ++ ++ err = gpio_direction_output(pdata->gpio_pin_data, 0); ++ if (err) { ++ dev_err(&pdev->dev, ++ "unable to set direction of gpio %u, err=%d\n", ++ pdata->gpio_pin_data, err); ++ goto err_free_data; ++ } ++ ++ nxp->parent = &pdev->dev; ++ mutex_init(&nxp->lock); ++ ++ gc = &nxp->gpio_chip; ++ ++ gc->direction_input = nxp_74hc164_direction_input; ++ gc->direction_output = nxp_74hc164_direction_output; ++ gc->get = nxp_74hc164_get_value; ++ gc->set = nxp_74hc164_set_value; ++ gc->can_sleep = 1; ++ ++ gc->base = pdata->gpio_base; ++ gc->ngpio = NXP_74HC164_NUM_GPIOS; ++ gc->label = dev_name(nxp->parent); ++ gc->dev = nxp->parent; ++ gc->owner = THIS_MODULE; ++ ++ err = gpiochip_add(&nxp->gpio_chip); ++ if (err) { ++ dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err); ++ goto err_free_data; ++ } ++ ++ platform_set_drvdata(pdev, nxp); ++ return 0; ++ ++ err_free_data: ++ gpio_free(pdata->gpio_pin_data); ++ err_free_clk: ++ gpio_free(pdata->gpio_pin_clk); ++ err_free_nxp: ++ kfree(nxp); ++ return err; ++} ++ ++static int nxp_74hc164_remove(struct platform_device *pdev) ++{ ++ struct nxp_74hc164_chip *nxp = platform_get_drvdata(pdev); ++ struct nxp_74hc164_platform_data *pdata = pdev->dev.platform_data; ++ ++ if (nxp) { ++ int err; ++ ++ err = gpiochip_remove(&nxp->gpio_chip); ++ if (err) { ++ dev_err(&pdev->dev, ++ "unable to remove gpio chip, err=%d\n", ++ err); ++ return err; ++ } ++ ++ gpio_free(pdata->gpio_pin_clk); ++ gpio_free(pdata->gpio_pin_data); ++ ++ kfree(nxp); ++ platform_set_drvdata(pdev, NULL); ++ } ++ ++ return 0; ++} ++ ++static struct platform_driver nxp_74hc164_driver = { ++ .probe = nxp_74hc164_probe, ++ .remove = __devexit_p(nxp_74hc164_remove), ++ .driver = { ++ .name = NXP_74HC164_DRIVER_NAME, ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++static int __init nxp_74hc164_init(void) ++{ ++ return platform_driver_register(&nxp_74hc164_driver); ++} ++subsys_initcall(nxp_74hc164_init); ++ ++static void __exit nxp_74hc164_exit(void) ++{ ++ platform_driver_unregister(&nxp_74hc164_driver); ++} ++module_exit(nxp_74hc164_exit); ++ ++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); ++MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>"); ++MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC164"); ++MODULE_LICENSE("GPL v2"); ++MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME); +--- /dev/null ++++ b/include/linux/nxp_74hc164.h +@@ -0,0 +1,22 @@ ++/* ++ * NXP 74HC164 - Dual 4-input multiplexer defines ++ * ++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> ++ * ++ * 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. ++ */ ++ ++#ifndef _NXP_74HC164_H ++#define _NXP_74HC164_H ++ ++#define NXP_74HC164_DRIVER_NAME "nxp-74hc164" ++ ++struct nxp_74hc164_platform_data { ++ unsigned gpio_base; ++ unsigned gpio_pin_data; ++ unsigned gpio_pin_clk; ++}; ++ ++#endif /* _NXP_74HC164_H */ |