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drivers/mfd/htc-pasic3.c
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/* * 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> |
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#include <linux/gpio.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/interrupt.h> |
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#include <linux/mfd/core.h> #include <linux/mfd/ds1wm.h> |
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#include <linux/mfd/htc-pasic3.h> |
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#include <linux/slab.h> |
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struct pasic3_data { void __iomem *mapping; unsigned int bus_shift; |
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}; #define REG_ADDR 5 #define REG_DATA 6 |
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#define READ_MODE 0x80 /* * write to a secondary register on the PASIC3 */ void pasic3_write_register(struct device *dev, u32 reg, u8 val) { |
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struct pasic3_data *asic = dev_get_drvdata(dev); |
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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) { |
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struct pasic3_data *asic = dev_get_drvdata(dev); |
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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 */ |
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static struct mfd_cell led_cell __initdata = { .name = "leds-pasic3", }; |
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/* * DS1WM */ |
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static int ds1wm_enable(struct platform_device *pdev) |
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{ 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 ", c & 0x7f); |
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return 0; |
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} |
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static int ds1wm_disable(struct platform_device *pdev) |
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{ 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 ", c | 0x80); |
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return 0; |
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} |
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static struct ds1wm_driver_data ds1wm_pdata = { .active_high = 0, |
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.reset_recover_delay = 1, |
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}; |
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static struct resource ds1wm_resources[] __initdata = { [0] = { .start = 0, .flags = IORESOURCE_MEM, }, [1] = { .start = 0, .end = 0, .flags = IORESOURCE_IRQ, }, }; |
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static struct mfd_cell ds1wm_cell __initdata = { .name = "ds1wm", .enable = ds1wm_enable, .disable = ds1wm_disable, |
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.platform_data = &ds1wm_pdata, .pdata_size = sizeof(ds1wm_pdata), |
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.num_resources = 2, .resources = ds1wm_resources, }; |
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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; |
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int irq = 0; r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (r) { ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags & (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE)); irq = r->start; } |
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!r) return -ENXIO; |
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if (!request_mem_region(r->start, resource_size(r), "pasic3")) |
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return -EBUSY; asic = kzalloc(sizeof(struct pasic3_data), GFP_KERNEL); if (!asic) return -ENOMEM; platform_set_drvdata(pdev, asic); |
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asic->mapping = ioremap(r->start, resource_size(r)); |
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if (!asic->mapping) { dev_err(dev, "couldn't ioremap PASIC3 "); kfree(asic); return -ENOMEM; } |
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/* calculate bus shift from mem resource */ asic->bus_shift = (resource_size(r) - 5) >> 3; |
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if (pdata && pdata->clock_rate) { ds1wm_pdata.clock_rate = pdata->clock_rate; /* the first 5 PASIC3 registers control the DS1WM */ ds1wm_resources[0].end = (5 << asic->bus_shift) - 1; |
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ret = mfd_add_devices(&pdev->dev, pdev->id, &ds1wm_cell, 1, r, irq); if (ret < 0) dev_warn(dev, "failed to register DS1WM "); } if (pdata && pdata->led_pdata) { |
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led_cell.platform_data = pdata->led_pdata; led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo); |
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ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 0); |
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if (ret < 0) dev_warn(dev, "failed to register LED device "); } return 0; } static int pasic3_remove(struct platform_device *pdev) { struct pasic3_data *asic = platform_get_drvdata(pdev); struct resource *r; |
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mfd_remove_devices(&pdev->dev); |
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iounmap(asic->mapping); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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release_mem_region(r->start, resource_size(r)); |
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kfree(asic); return 0; } |
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MODULE_ALIAS("platform:pasic3"); |
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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"); |