/* * Core driver for HTC PASIC3 LED/DS1WM chip. * * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com> * * 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. */ #include <linux/init.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/ds1wm.h> #include <linux/gpio.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/mfd/htc-pasic3.h> struct pasic3_data { void __iomem *mapping; unsigned int bus_shift; struct platform_device *ds1wm_pdev; struct platform_device *led_pdev; }; #define REG_ADDR 5 #define REG_DATA 6 #define READ_MODE 0x80 /* * write to a secondary register on the PASIC3 */ void pasic3_write_register(struct device *dev, u32 reg, u8 val) { struct pasic3_data *asic = dev->driver_data; int bus_shift = asic->bus_shift; void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); void __iomem *data = asic->mapping + (REG_DATA << bus_shift); __raw_writeb(~READ_MODE & reg, addr); __raw_writeb(val, data); } EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */ /* * read from a secondary register on the PASIC3 */ u8 pasic3_read_register(struct device *dev, u32 reg) { struct pasic3_data *asic = dev->driver_data; int bus_shift = asic->bus_shift; void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); void __iomem *data = asic->mapping + (REG_DATA << bus_shift); __raw_writeb(READ_MODE | reg, addr); return __raw_readb(data); } EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */ /* * LEDs */ static int led_device_add(struct device *pasic3_dev, const struct pasic3_leds_machinfo *pdata) { struct pasic3_data *asic = pasic3_dev->driver_data; struct platform_device *pdev; int ret; pdev = platform_device_alloc("pasic3-led", -1); if (!pdev) { dev_dbg(pasic3_dev, "failed to allocate LED platform device\n"); return -ENOMEM; } ret = platform_device_add_data(pdev, pdata, sizeof(struct pasic3_leds_machinfo)); if (ret < 0) { dev_dbg(pasic3_dev, "failed to add LED platform data\n"); goto exit_pdev_put; } pdev->dev.parent = pasic3_dev; ret = platform_device_add(pdev); if (ret < 0) { dev_dbg(pasic3_dev, "failed to add LED platform device\n"); goto exit_pdev_put; } asic->led_pdev = pdev; return 0; exit_pdev_put: platform_device_put(pdev); return ret; } /* * DS1WM */ static void ds1wm_enable(struct platform_device *pdev) { struct device *dev = pdev->dev.parent; int c; c = pasic3_read_register(dev, 0x28); pasic3_write_register(dev, 0x28, c & 0x7f); dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f); } static void ds1wm_disable(struct platform_device *pdev) { struct device *dev = pdev->dev.parent; int c; c = pasic3_read_register(dev, 0x28); pasic3_write_register(dev, 0x28, c | 0x80); dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80); } static struct ds1wm_platform_data ds1wm_pdata = { .bus_shift = 2, .enable = ds1wm_enable, .disable = ds1wm_disable, }; static int ds1wm_device_add(struct platform_device *pasic3_pdev, int bus_shift) { struct device *pasic3_dev = &pasic3_pdev->dev; struct pasic3_data *asic = pasic3_dev->driver_data; struct platform_device *pdev; int ret; pdev = platform_device_alloc("ds1wm", -1); if (!pdev) { dev_dbg(pasic3_dev, "failed to allocate DS1WM platform device\n"); return -ENOMEM; } ret = platform_device_add_resources(pdev, pasic3_pdev->resource, pasic3_pdev->num_resources); if (ret < 0) { dev_dbg(pasic3_dev, "failed to add DS1WM resources\n"); goto exit_pdev_put; } ds1wm_pdata.bus_shift = asic->bus_shift; ret = platform_device_add_data(pdev, &ds1wm_pdata, sizeof(struct ds1wm_platform_data)); if (ret < 0) { dev_dbg(pasic3_dev, "failed to add DS1WM platform data\n"); goto exit_pdev_put; } pdev->dev.parent = pasic3_dev; ret = platform_device_add(pdev); if (ret < 0) { dev_dbg(pasic3_dev, "failed to add DS1WM platform device\n"); goto exit_pdev_put; } asic->ds1wm_pdev = pdev; return 0; exit_pdev_put: platform_device_put(pdev); return ret; } static int __init pasic3_probe(struct platform_device *pdev) { struct pasic3_platform_data *pdata = pdev->dev.platform_data; struct device *dev = &pdev->dev; struct pasic3_data *asic; struct resource *r; int ret; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) return -ENXIO; if (!request_mem_region(r->start, r->end - r->start + 1, "pasic3")) return -EBUSY; asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL); if (!asic) return -ENOMEM; platform_set_drvdata(pdev, asic); if (pdata && pdata->bus_shift) asic->bus_shift = pdata->bus_shift; else asic->bus_shift = 2; asic->mapping = ioremap(r->start, r->end - r->start + 1); if (!asic->mapping) { dev_err(dev, "couldn't ioremap PASIC3\n"); kfree(asic); return -ENOMEM; } ret = ds1wm_device_add(pdev, asic->bus_shift); if (ret < 0) dev_warn(dev, "failed to register DS1WM\n"); if (pdata->led_pdata) { ret = led_device_add(dev, pdata->led_pdata); if (ret < 0) dev_warn(dev, "failed to register LED device\n"); } return 0; } static int pasic3_remove(struct platform_device *pdev) { struct pasic3_data *asic = platform_get_drvdata(pdev); struct resource *r; if (asic->led_pdev) platform_device_unregister(asic->led_pdev); if (asic->ds1wm_pdev) platform_device_unregister(asic->ds1wm_pdev); iounmap(asic->mapping); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(r->start, r->end - r->start + 1); kfree(asic); return 0; } MODULE_ALIAS("platform:pasic3"); static struct platform_driver pasic3_driver = { .driver = { .name = "pasic3", }, .remove = pasic3_remove, }; static int __init pasic3_base_init(void) { return platform_driver_probe(&pasic3_driver, pasic3_probe); } static void __exit pasic3_base_exit(void) { platform_driver_unregister(&pasic3_driver); } module_init(pasic3_base_init); module_exit(pasic3_base_exit); MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>"); MODULE_DESCRIPTION("Core driver for HTC PASIC3"); MODULE_LICENSE("GPL");