/* * wm831x-isink.c -- Current sink driver for the WM831x series * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.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; either version 2 of the License, or (at your * option) any later version. */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/bitops.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/slab.h> #include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/regulator.h> #include <linux/mfd/wm831x/pdata.h> #define WM831X_ISINK_MAX_NAME 7 struct wm831x_isink { char name[WM831X_ISINK_MAX_NAME]; struct regulator_desc desc; int reg; struct wm831x *wm831x; struct regulator_dev *regulator; }; static int wm831x_isink_enable(struct regulator_dev *rdev) { struct wm831x_isink *isink = rdev_get_drvdata(rdev); struct wm831x *wm831x = isink->wm831x; int ret; /* We have a two stage enable: first start the ISINK... */ ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, WM831X_CS1_ENA); if (ret != 0) return ret; /* ...then enable drive */ ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, WM831X_CS1_DRIVE); if (ret != 0) wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0); return ret; } static int wm831x_isink_disable(struct regulator_dev *rdev) { struct wm831x_isink *isink = rdev_get_drvdata(rdev); struct wm831x *wm831x = isink->wm831x; int ret; ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_DRIVE, 0); if (ret < 0) return ret; ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ENA, 0); if (ret < 0) return ret; return ret; } static int wm831x_isink_is_enabled(struct regulator_dev *rdev) { struct wm831x_isink *isink = rdev_get_drvdata(rdev); struct wm831x *wm831x = isink->wm831x; int ret; ret = wm831x_reg_read(wm831x, isink->reg); if (ret < 0) return ret; if ((ret & (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) == (WM831X_CS1_ENA | WM831X_CS1_DRIVE)) return 1; else return 0; } static int wm831x_isink_set_current(struct regulator_dev *rdev, int min_uA, int max_uA) { struct wm831x_isink *isink = rdev_get_drvdata(rdev); struct wm831x *wm831x = isink->wm831x; int ret, i; for (i = 0; i < ARRAY_SIZE(wm831x_isinkv_values); i++) { int val = wm831x_isinkv_values[i]; if (min_uA <= val && val <= max_uA) { ret = wm831x_set_bits(wm831x, isink->reg, WM831X_CS1_ISEL_MASK, i); return ret; } } return -EINVAL; } static int wm831x_isink_get_current(struct regulator_dev *rdev) { struct wm831x_isink *isink = rdev_get_drvdata(rdev); struct wm831x *wm831x = isink->wm831x; int ret; ret = wm831x_reg_read(wm831x, isink->reg); if (ret < 0) return ret; ret &= WM831X_CS1_ISEL_MASK; if (ret > WM831X_ISINK_MAX_ISEL) ret = WM831X_ISINK_MAX_ISEL; return wm831x_isinkv_values[ret]; } static const struct regulator_ops wm831x_isink_ops = { .is_enabled = wm831x_isink_is_enabled, .enable = wm831x_isink_enable, .disable = wm831x_isink_disable, .set_current_limit = wm831x_isink_set_current, .get_current_limit = wm831x_isink_get_current, }; static irqreturn_t wm831x_isink_irq(int irq, void *data) { struct wm831x_isink *isink = data; regulator_notifier_call_chain(isink->regulator, REGULATOR_EVENT_OVER_CURRENT, NULL); return IRQ_HANDLED; } static int wm831x_isink_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); struct wm831x_isink *isink; int id = pdev->id % ARRAY_SIZE(pdata->isink); struct regulator_config config = { }; struct resource *res; int ret, irq; dev_dbg(&pdev->dev, "Probing ISINK%d\n", id + 1); if (pdata == NULL || pdata->isink[id] == NULL) return -ENODEV; isink = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_isink), GFP_KERNEL); if (!isink) return -ENOMEM; isink->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_REG, 0); if (res == NULL) { dev_err(&pdev->dev, "No REG resource\n"); ret = -EINVAL; goto err; } isink->reg = res->start; /* For current parts this is correct; probably need to revisit * in future. */ snprintf(isink->name, sizeof(isink->name), "ISINK%d", id + 1); isink->desc.name = isink->name; isink->desc.id = id; isink->desc.ops = &wm831x_isink_ops; isink->desc.type = REGULATOR_CURRENT; isink->desc.owner = THIS_MODULE; config.dev = pdev->dev.parent; config.init_data = pdata->isink[id]; config.driver_data = isink; isink->regulator = devm_regulator_register(&pdev->dev, &isink->desc, &config); if (IS_ERR(isink->regulator)) { ret = PTR_ERR(isink->regulator); dev_err(wm831x->dev, "Failed to register ISINK%d: %d\n", id + 1, ret); goto err; } irq = wm831x_irq(wm831x, platform_get_irq(pdev, 0)); ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, wm831x_isink_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT, isink->name, isink); if (ret != 0) { dev_err(&pdev->dev, "Failed to request ISINK IRQ %d: %d\n", irq, ret); goto err; } platform_set_drvdata(pdev, isink); return 0; err: return ret; } static struct platform_driver wm831x_isink_driver = { .probe = wm831x_isink_probe, .driver = { .name = "wm831x-isink", }, }; static int __init wm831x_isink_init(void) { int ret; ret = platform_driver_register(&wm831x_isink_driver); if (ret != 0) pr_err("Failed to register WM831x ISINK driver: %d\n", ret); return ret; } subsys_initcall(wm831x_isink_init); static void __exit wm831x_isink_exit(void) { platform_driver_unregister(&wm831x_isink_driver); } module_exit(wm831x_isink_exit); /* Module information */ MODULE_AUTHOR("Mark Brown"); MODULE_DESCRIPTION("WM831x current sink driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm831x-isink");