/* * wm8994-regulator.c -- Regulator driver for the WM8994 * * Copyright 2009 Wolfson Microelectronics PLC. * * Author: Mark Brown * * 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 #include #include #include #include #include #include #include #include #include #include #include struct wm8994_ldo { int enable; bool is_enabled; struct regulator_dev *regulator; struct wm8994 *wm8994; }; #define WM8994_LDO1_MAX_SELECTOR 0x7 #define WM8994_LDO2_MAX_SELECTOR 0x3 static int wm8994_ldo_enable(struct regulator_dev *rdev) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); /* If we have no soft control assume that the LDO is always enabled. */ if (!ldo->enable) return 0; gpio_set_value(ldo->enable, 1); ldo->is_enabled = true; return 0; } static int wm8994_ldo_disable(struct regulator_dev *rdev) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); /* If we have no soft control assume that the LDO is always enabled. */ if (!ldo->enable) return -EINVAL; gpio_set_value(ldo->enable, 0); ldo->is_enabled = false; return 0; } static int wm8994_ldo_is_enabled(struct regulator_dev *rdev) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); return ldo->is_enabled; } static int wm8994_ldo_enable_time(struct regulator_dev *rdev) { /* 3ms is fairly conservative but this shouldn't be too performance * critical; can be tweaked per-system if required. */ return 3000; } static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev, unsigned int selector) { if (selector > WM8994_LDO1_MAX_SELECTOR) return -EINVAL; return (selector * 100000) + 2400000; } static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); int val; val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1); if (val < 0) return val; val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT; return wm8994_ldo1_list_voltage(rdev, val); } static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); int selector, v; selector = (min_uV - 2400000) / 100000; v = wm8994_ldo1_list_voltage(rdev, selector); if (v < 0 || v > max_uV) return -EINVAL; selector <<= WM8994_LDO1_VSEL_SHIFT; return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1, WM8994_LDO1_VSEL_MASK, selector); } static struct regulator_ops wm8994_ldo1_ops = { .enable = wm8994_ldo_enable, .disable = wm8994_ldo_disable, .is_enabled = wm8994_ldo_is_enabled, .enable_time = wm8994_ldo_enable_time, .list_voltage = wm8994_ldo1_list_voltage, .get_voltage = wm8994_ldo1_get_voltage, .set_voltage = wm8994_ldo1_set_voltage, }; static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, unsigned int selector) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); if (selector > WM8994_LDO2_MAX_SELECTOR) return -EINVAL; switch (ldo->wm8994->type) { case WM8994: return (selector * 100000) + 900000; case WM8958: return (selector * 100000) + 1000000; default: return -EINVAL; } } static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); int val; val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2); if (val < 0) return val; val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT; return wm8994_ldo2_list_voltage(rdev, val); } static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); int selector, v; switch (ldo->wm8994->type) { case WM8994: selector = (min_uV - 900000) / 100000; break; case WM8958: selector = (min_uV - 1000000) / 100000; break; default: return -EINVAL; } v = wm8994_ldo2_list_voltage(rdev, selector); if (v < 0 || v > max_uV) return -EINVAL; selector <<= WM8994_LDO2_VSEL_SHIFT; return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2, WM8994_LDO2_VSEL_MASK, selector); } static struct regulator_ops wm8994_ldo2_ops = { .enable = wm8994_ldo_enable, .disable = wm8994_ldo_disable, .is_enabled = wm8994_ldo_is_enabled, .enable_time = wm8994_ldo_enable_time, .list_voltage = wm8994_ldo2_list_voltage, .get_voltage = wm8994_ldo2_get_voltage, .set_voltage = wm8994_ldo2_set_voltage, }; static struct regulator_desc wm8994_ldo_desc[] = { { .name = "LDO1", .id = 1, .type = REGULATOR_VOLTAGE, .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, .ops = &wm8994_ldo1_ops, .owner = THIS_MODULE, }, { .name = "LDO2", .id = 2, .type = REGULATOR_VOLTAGE, .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, .ops = &wm8994_ldo2_ops, .owner = THIS_MODULE, }, }; static __devinit int wm8994_ldo_probe(struct platform_device *pdev) { struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); struct wm8994_pdata *pdata = wm8994->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->ldo); struct wm8994_ldo *ldo; int ret; dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); if (!pdata) return -ENODEV; ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL); if (ldo == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } ldo->wm8994 = wm8994; if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) { ldo->enable = pdata->ldo[id].enable; ret = gpio_request(ldo->enable, "WM8994 LDO enable"); if (ret < 0) { dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret); goto err; } ret = gpio_direction_output(ldo->enable, ldo->is_enabled); if (ret < 0) { dev_err(&pdev->dev, "Failed to set GPIO up: %d\n", ret); goto err_gpio; } } else ldo->is_enabled = true; ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev, pdata->ldo[id].init_data, ldo); if (IS_ERR(ldo->regulator)) { ret = PTR_ERR(ldo->regulator); dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", id + 1, ret); goto err_gpio; } platform_set_drvdata(pdev, ldo); return 0; err_gpio: if (gpio_is_valid(ldo->enable)) gpio_free(ldo->enable); err: kfree(ldo); return ret; } static __devexit int wm8994_ldo_remove(struct platform_device *pdev) { struct wm8994_ldo *ldo = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); regulator_unregister(ldo->regulator); if (gpio_is_valid(ldo->enable)) gpio_free(ldo->enable); kfree(ldo); return 0; } static struct platform_driver wm8994_ldo_driver = { .probe = wm8994_ldo_probe, .remove = __devexit_p(wm8994_ldo_remove), .driver = { .name = "wm8994-ldo", .owner = THIS_MODULE, }, }; static int __init wm8994_ldo_init(void) { int ret; ret = platform_driver_register(&wm8994_ldo_driver); if (ret != 0) pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret); return ret; } subsys_initcall(wm8994_ldo_init); static void __exit wm8994_ldo_exit(void) { platform_driver_unregister(&wm8994_ldo_driver); } module_exit(wm8994_ldo_exit); /* Module information */ MODULE_AUTHOR("Mark Brown "); MODULE_DESCRIPTION("WM8994 LDO driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm8994-ldo");