[kernel] move lots of kernel related packages to the new system/ folder

[openwrt/svn-archive/archive.git] / package / system / rotary-gpio-custom / src / rotary-gpio-custom.c

diff --git a/package/system/rotary-gpio-custom/src/rotary-gpio-custom.c b/package/system/rotary-gpio-custom/src/rotary-gpio-custom.c
new file mode 100644 (file)
index 0000000..8cd8ef1
--- /dev/null
+++ b/package/system/rotary-gpio-custom/src/rotary-gpio-custom.c
@@ -0,0 +1,188 @@
+/*
+ *  Custom GPIO-based rotary driver
+ *
+ *  Copyright (C) 2010 Claudio Mignanti <c.mignanti@gmail.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.
+ *
+ *  Strongly based on Custom GPIO-based I2C driver by:
+ *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * ---------------------------------------------------------------------------
+ *
+ *  The behaviour of this driver can be altered by setting some parameters
+ *  from the insmod command line.
+ *
+ *  The following parameters are adjustable:
+ *
+ *     bus0    These four arguments can be arrays of
+ *     bus1    1-8 unsigned integers as follows:
+ *     bus2
+ *     bus3    <id>,<steps>,<axis>,<gpioa>,<gpiob>,<inverted>
+ *
+ *
+ *  If this driver is built into the kernel, you can use the following kernel
+ *  command line parameters, with the same values as the corresponding module
+ *  parameters listed above:
+ *
+ *     rotary-gpio-custom.bus0
+ *     rotary-gpio-custom.bus1
+ *     rotary-gpio-custom.bus2
+ *     rotary-gpio-custom.bus3
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/rotary_encoder.h>
+
+#define DRV_NAME       "rotary-gpio-custom"
+#define DRV_DESC       "Custom GPIO-based rotary driver"
+#define DRV_VERSION    "0.1.0"
+
+#define PFX            DRV_NAME ": "
+
+#define BUS_PARAM_REQUIRED     5
+#define BUS_PARAM_COUNT                6
+#define BUS_COUNT_MAX          4
+
+static unsigned int bus0[BUS_PARAM_COUNT] __initdata;
+static unsigned int bus1[BUS_PARAM_COUNT] __initdata;
+static unsigned int bus2[BUS_PARAM_COUNT] __initdata;
+static unsigned int bus3[BUS_PARAM_COUNT] __initdata;
+
+static unsigned int bus_nump[BUS_COUNT_MAX] __initdata;
+
+#define BUS_PARM_DESC \
+       " config -> id,steps,axis,gpioa,gpiob[,inverted]"
+
+module_param_array(bus0, uint, &bus_nump[0], 0);
+MODULE_PARM_DESC(bus0, "bus0" BUS_PARM_DESC);
+module_param_array(bus1, uint, &bus_nump[1], 0);
+MODULE_PARM_DESC(bus1, "bus1" BUS_PARM_DESC);
+module_param_array(bus2, uint, &bus_nump[2], 0);
+MODULE_PARM_DESC(bus2, "bus2" BUS_PARM_DESC);
+module_param_array(bus3, uint, &bus_nump[3], 0);
+MODULE_PARM_DESC(bus3, "bus3" BUS_PARM_DESC);
+
+static struct platform_device *devices[BUS_COUNT_MAX];
+static unsigned int nr_devices;
+
+static void rotary_gpio_custom_cleanup(void)
+{
+       int i;
+
+       for (i = 0; i < nr_devices; i++)
+               if (devices[i])
+                       platform_device_put(devices[i]);
+}
+
+static int __init rotary_gpio_custom_add_one(unsigned int id, unsigned int *params)
+{
+       struct platform_device *pdev;
+       struct rotary_encoder_platform_data pdata;
+       int err;
+
+       if (!bus_nump[id])
+               return 0;
+
+       if (bus_nump[id] < BUS_PARAM_REQUIRED) {
+               printk(KERN_ERR PFX "not enough parameters for bus%d\n", id);
+               err = -EINVAL;
+               goto err;
+       }
+
+       pdev = platform_device_alloc("rotary-gpio", params[0]);
+       if (!pdev) {
+               err = -ENOMEM;
+               goto err;
+       }
+
+       pdata.steps = params[1];
+       pdata.axis = params[2];
+       pdata.relative_axis = false;
+       pdata.rollover = false;
+       pdata.gpio_a = params[3];
+       pdata.gpio_b = params[4];
+       
+       if (params[5] == 1) {
+               pdata.inverted_a = 1;
+               pdata.inverted_b = 1;
+       } else {
+               pdata.inverted_a = 0;
+               pdata.inverted_b = 0;
+       }
+
+       err = platform_device_add_data(pdev, &pdata, sizeof(pdata));
+       if (err)
+               goto err_put;
+
+       err = platform_device_add(pdev);
+       if (err)
+               goto err_put;
+
+       devices[nr_devices++] = pdev;
+       return 0;
+
+err_put:
+       platform_device_put(pdev);
+err:
+       return err;
+}
+
+static int __init rotary_gpio_custom_probe(void)
+{
+       int err;
+
+       printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
+
+       err = rotary_gpio_custom_add_one(0, bus0);
+       if (err) goto err;
+
+       err = rotary_gpio_custom_add_one(1, bus1);
+       if (err) goto err;
+
+       err = rotary_gpio_custom_add_one(2, bus2);
+       if (err) goto err;
+
+       err = rotary_gpio_custom_add_one(3, bus3);
+       if (err) goto err;
+
+       if (!nr_devices) {
+               printk(KERN_ERR PFX "no bus parameter(s) specified\n");
+               err = -ENODEV;
+               goto err;
+       }
+
+       return 0;
+
+err:
+       rotary_gpio_custom_cleanup();
+       return err;
+}
+
+#ifdef MODULE
+static int __init rotary_gpio_custom_init(void)
+{
+       return rotary_gpio_custom_probe();
+}
+module_init(rotary_gpio_custom_init);
+
+static void __exit rotary_gpio_custom_exit(void)
+{
+       rotary_gpio_custom_cleanup();
+}
+module_exit(rotary_gpio_custom_exit);
+#else
+subsys_initcall(rotary_gpio_custom_probe);
+#endif /* MODULE*/
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org >");
+MODULE_AUTHOR("Claudio Mignanti <c.mignanti@gmail.com>");
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);