// SPDX-License-Identifier: GPL-2.0-only /* * PXA930 track ball mouse driver * * Copyright (C) 2007 Marvell International Ltd. * 2008-02-28: Yong Yao * initial version */ #include #include #include #include #include #include #include #include #include /* Trackball Controller Register Definitions */ #define TBCR (0x000C) #define TBCNTR (0x0010) #define TBSBC (0x0014) #define TBCR_TBRST (1 << 1) #define TBCR_TBSB (1 << 10) #define TBCR_Y_FLT(n) (((n) & 0xf) << 6) #define TBCR_X_FLT(n) (((n) & 0xf) << 2) #define TBCNTR_YM(n) (((n) >> 24) & 0xff) #define TBCNTR_YP(n) (((n) >> 16) & 0xff) #define TBCNTR_XM(n) (((n) >> 8) & 0xff) #define TBCNTR_XP(n) ((n) & 0xff) #define TBSBC_TBSBC (0x1) struct pxa930_trkball { struct pxa930_trkball_platform_data *pdata; /* Memory Mapped Register */ struct resource *mem; void __iomem *mmio_base; struct input_dev *input; }; static irqreturn_t pxa930_trkball_interrupt(int irq, void *dev_id) { struct pxa930_trkball *trkball = dev_id; struct input_dev *input = trkball->input; int tbcntr, x, y; /* According to the spec software must read TBCNTR twice: * if the read value is the same, the reading is valid */ tbcntr = __raw_readl(trkball->mmio_base + TBCNTR); if (tbcntr == __raw_readl(trkball->mmio_base + TBCNTR)) { x = (TBCNTR_XP(tbcntr) - TBCNTR_XM(tbcntr)) / 2; y = (TBCNTR_YP(tbcntr) - TBCNTR_YM(tbcntr)) / 2; input_report_rel(input, REL_X, x); input_report_rel(input, REL_Y, y); input_sync(input); } __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); __raw_writel(0, trkball->mmio_base + TBSBC); return IRQ_HANDLED; } /* For TBCR, we need to wait for a while to make sure it has been modified. */ static int write_tbcr(struct pxa930_trkball *trkball, int v) { int i = 100; __raw_writel(v, trkball->mmio_base + TBCR); while (--i) { if (__raw_readl(trkball->mmio_base + TBCR) == v) break; msleep(1); } if (i == 0) { pr_err("%s: timed out writing TBCR(%x)!\n", __func__, v); return -ETIMEDOUT; } return 0; } static void pxa930_trkball_config(struct pxa930_trkball *trkball) { uint32_t tbcr; /* According to spec, need to write the filters of x,y to 0xf first! */ tbcr = __raw_readl(trkball->mmio_base + TBCR); write_tbcr(trkball, tbcr | TBCR_X_FLT(0xf) | TBCR_Y_FLT(0xf)); write_tbcr(trkball, TBCR_X_FLT(trkball->pdata->x_filter) | TBCR_Y_FLT(trkball->pdata->y_filter)); /* According to spec, set TBCR_TBRST first, before clearing it! */ tbcr = __raw_readl(trkball->mmio_base + TBCR); write_tbcr(trkball, tbcr | TBCR_TBRST); write_tbcr(trkball, tbcr & ~TBCR_TBRST); __raw_writel(TBSBC_TBSBC, trkball->mmio_base + TBSBC); __raw_writel(0, trkball->mmio_base + TBSBC); pr_debug("%s: final TBCR=%x!\n", __func__, __raw_readl(trkball->mmio_base + TBCR)); } static int pxa930_trkball_open(struct input_dev *dev) { struct pxa930_trkball *trkball = input_get_drvdata(dev); pxa930_trkball_config(trkball); return 0; } static void pxa930_trkball_disable(struct pxa930_trkball *trkball) { uint32_t tbcr = __raw_readl(trkball->mmio_base + TBCR); /* Held in reset, gate the 32-KHz input clock off */ write_tbcr(trkball, tbcr | TBCR_TBRST); } static void pxa930_trkball_close(struct input_dev *dev) { struct pxa930_trkball *trkball = input_get_drvdata(dev); pxa930_trkball_disable(trkball); } static int pxa930_trkball_probe(struct platform_device *pdev) { struct pxa930_trkball *trkball; struct input_dev *input; struct resource *res; int irq, error; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "failed to get trkball irq\n"); return -ENXIO; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "failed to get register memory\n"); return -ENXIO; } trkball = kzalloc(sizeof(struct pxa930_trkball), GFP_KERNEL); if (!trkball) return -ENOMEM; trkball->pdata = dev_get_platdata(&pdev->dev); if (!trkball->pdata) { dev_err(&pdev->dev, "no platform data defined\n"); error = -EINVAL; goto failed; } trkball->mmio_base = ioremap_nocache(res->start, resource_size(res)); if (!trkball->mmio_base) { dev_err(&pdev->dev, "failed to ioremap registers\n"); error = -ENXIO; goto failed; } /* held the module in reset, will be enabled in open() */ pxa930_trkball_disable(trkball); error = request_irq(irq, pxa930_trkball_interrupt, 0, pdev->name, trkball); if (error) { dev_err(&pdev->dev, "failed to request irq: %d\n", error); goto failed_free_io; } platform_set_drvdata(pdev, trkball); input = input_allocate_device(); if (!input) { dev_err(&pdev->dev, "failed to allocate input device\n"); error = -ENOMEM; goto failed_free_irq; } input->name = pdev->name; input->id.bustype = BUS_HOST; input->open = pxa930_trkball_open; input->close = pxa930_trkball_close; input->dev.parent = &pdev->dev; input_set_drvdata(input, trkball); trkball->input = input; input_set_capability(input, EV_REL, REL_X); input_set_capability(input, EV_REL, REL_Y); error = input_register_device(input); if (error) { dev_err(&pdev->dev, "unable to register input device\n"); goto failed_free_input; } return 0; failed_free_input: input_free_device(input); failed_free_irq: free_irq(irq, trkball); failed_free_io: iounmap(trkball->mmio_base); failed: kfree(trkball); return error; } static int pxa930_trkball_remove(struct platform_device *pdev) { struct pxa930_trkball *trkball = platform_get_drvdata(pdev); int irq = platform_get_irq(pdev, 0); input_unregister_device(trkball->input); free_irq(irq, trkball); iounmap(trkball->mmio_base); kfree(trkball); return 0; } static struct platform_driver pxa930_trkball_driver = { .driver = { .name = "pxa930-trkball", }, .probe = pxa930_trkball_probe, .remove = pxa930_trkball_remove, }; module_platform_driver(pxa930_trkball_driver); MODULE_AUTHOR("Yong Yao "); MODULE_DESCRIPTION("PXA930 Trackball Mouse Driver"); MODULE_LICENSE("GPL");