/* * Driver for the enhanced rotary controller on pxa930 and pxa935 * * 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. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/input.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/slab.h> #include <mach/pxa930_rotary.h> #define SBCR (0x04) #define ERCR (0x0c) #define SBCR_ERSB (1 << 5) struct pxa930_rotary { struct input_dev *input_dev; void __iomem *mmio_base; int last_ercr; struct pxa930_rotary_platform_data *pdata; }; static void clear_sbcr(struct pxa930_rotary *r) { uint32_t sbcr = __raw_readl(r->mmio_base + SBCR); __raw_writel(sbcr | SBCR_ERSB, r->mmio_base + SBCR); __raw_writel(sbcr & ~SBCR_ERSB, r->mmio_base + SBCR); } static irqreturn_t rotary_irq(int irq, void *dev_id) { struct pxa930_rotary *r = dev_id; struct pxa930_rotary_platform_data *pdata = r->pdata; int ercr, delta, key; ercr = __raw_readl(r->mmio_base + ERCR) & 0xf; clear_sbcr(r); delta = ercr - r->last_ercr; if (delta == 0) return IRQ_HANDLED; r->last_ercr = ercr; if (pdata->up_key && pdata->down_key) { key = (delta > 0) ? pdata->up_key : pdata->down_key; input_report_key(r->input_dev, key, 1); input_sync(r->input_dev); input_report_key(r->input_dev, key, 0); } else input_report_rel(r->input_dev, pdata->rel_code, delta); input_sync(r->input_dev); return IRQ_HANDLED; } static int pxa930_rotary_open(struct input_dev *dev) { struct pxa930_rotary *r = input_get_drvdata(dev); clear_sbcr(r); return 0; } static void pxa930_rotary_close(struct input_dev *dev) { struct pxa930_rotary *r = input_get_drvdata(dev); clear_sbcr(r); } static int __devinit pxa930_rotary_probe(struct platform_device *pdev) { struct pxa930_rotary_platform_data *pdata = pdev->dev.platform_data; struct pxa930_rotary *r; struct input_dev *input_dev; struct resource *res; int irq; int err; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "no irq for rotary controller\n"); return -ENXIO; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "no I/O memory defined\n"); return -ENXIO; } if (!pdata) { dev_err(&pdev->dev, "no platform data defined\n"); return -EINVAL; } r = kzalloc(sizeof(struct pxa930_rotary), GFP_KERNEL); if (!r) return -ENOMEM; r->mmio_base = ioremap_nocache(res->start, resource_size(res)); if (r->mmio_base == NULL) { dev_err(&pdev->dev, "failed to remap IO memory\n"); err = -ENXIO; goto failed_free; } r->pdata = pdata; platform_set_drvdata(pdev, r); /* allocate and register the input device */ input_dev = input_allocate_device(); if (!input_dev) { dev_err(&pdev->dev, "failed to allocate input device\n"); err = -ENOMEM; goto failed_free_io; } input_dev->name = pdev->name; input_dev->id.bustype = BUS_HOST; input_dev->open = pxa930_rotary_open; input_dev->close = pxa930_rotary_close; input_dev->dev.parent = &pdev->dev; if (pdata->up_key && pdata->down_key) { __set_bit(pdata->up_key, input_dev->keybit); __set_bit(pdata->down_key, input_dev->keybit); __set_bit(EV_KEY, input_dev->evbit); } else { __set_bit(pdata->rel_code, input_dev->relbit); __set_bit(EV_REL, input_dev->evbit); } r->input_dev = input_dev; input_set_drvdata(input_dev, r); err = request_irq(irq, rotary_irq, 0, "enhanced rotary", r); if (err) { dev_err(&pdev->dev, "failed to request IRQ\n"); goto failed_free_input; } err = input_register_device(input_dev); if (err) { dev_err(&pdev->dev, "failed to register input device\n"); goto failed_free_irq; } return 0; failed_free_irq: free_irq(irq, r); failed_free_input: input_free_device(input_dev); failed_free_io: iounmap(r->mmio_base); failed_free: kfree(r); return err; } static int __devexit pxa930_rotary_remove(struct platform_device *pdev) { struct pxa930_rotary *r = platform_get_drvdata(pdev); free_irq(platform_get_irq(pdev, 0), r); input_unregister_device(r->input_dev); iounmap(r->mmio_base); platform_set_drvdata(pdev, NULL); kfree(r); return 0; } static struct platform_driver pxa930_rotary_driver = { .driver = { .name = "pxa930-rotary", .owner = THIS_MODULE, }, .probe = pxa930_rotary_probe, .remove = __devexit_p(pxa930_rotary_remove), }; module_platform_driver(pxa930_rotary_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Driver for PXA93x Enhanced Rotary Controller"); MODULE_AUTHOR("Yao Yong <yaoyong@marvell.com>");