/* * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series * * 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 #include #include #define WM831X_BUCKV_MAX_SELECTOR 0x68 #define WM831X_BUCKP_MAX_SELECTOR 0x66 #define WM831X_DCDC_MODE_FAST 0 #define WM831X_DCDC_MODE_NORMAL 1 #define WM831X_DCDC_MODE_IDLE 2 #define WM831X_DCDC_MODE_STANDBY 3 #define WM831X_DCDC_MAX_NAME 6 /* Register offsets in control block */ #define WM831X_DCDC_CONTROL_1 0 #define WM831X_DCDC_CONTROL_2 1 #define WM831X_DCDC_ON_CONFIG 2 #define WM831X_DCDC_SLEEP_CONTROL 3 #define WM831X_DCDC_DVS_CONTROL 4 /* * Shared */ struct wm831x_dcdc { char name[WM831X_DCDC_MAX_NAME]; struct regulator_desc desc; int base; struct wm831x *wm831x; struct regulator_dev *regulator; int dvs_gpio; int dvs_gpio_state; int on_vsel; int dvs_vsel; }; static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int mask = 1 << rdev_get_id(rdev); int reg; reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE); if (reg < 0) return reg; if (reg & mask) return 1; else return 0; } static int wm831x_dcdc_enable(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int mask = 1 << rdev_get_id(rdev); return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask); } static int wm831x_dcdc_disable(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int mask = 1 << rdev_get_id(rdev); return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0); } static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; int val; val = wm831x_reg_read(wm831x, reg); if (val < 0) return val; val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; switch (val) { case WM831X_DCDC_MODE_FAST: return REGULATOR_MODE_FAST; case WM831X_DCDC_MODE_NORMAL: return REGULATOR_MODE_NORMAL; case WM831X_DCDC_MODE_STANDBY: return REGULATOR_MODE_STANDBY; case WM831X_DCDC_MODE_IDLE: return REGULATOR_MODE_IDLE; default: BUG(); return -EINVAL; } } static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, unsigned int mode) { int val; switch (mode) { case REGULATOR_MODE_FAST: val = WM831X_DCDC_MODE_FAST; break; case REGULATOR_MODE_NORMAL: val = WM831X_DCDC_MODE_NORMAL; break; case REGULATOR_MODE_STANDBY: val = WM831X_DCDC_MODE_STANDBY; break; case REGULATOR_MODE_IDLE: val = WM831X_DCDC_MODE_IDLE; break; default: return -EINVAL; } return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, val << WM831X_DC1_ON_MODE_SHIFT); } static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; return wm831x_dcdc_set_mode_int(wm831x, reg, mode); } static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; return wm831x_dcdc_set_mode_int(wm831x, reg, mode); } static int wm831x_dcdc_get_status(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int ret; /* First, check for errors */ ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); if (ret < 0) return ret; if (ret & (1 << rdev_get_id(rdev))) { dev_dbg(wm831x->dev, "DCDC%d under voltage\n", rdev_get_id(rdev) + 1); return REGULATOR_STATUS_ERROR; } /* DCDC1 and DCDC2 can additionally detect high voltage/current */ if (rdev_get_id(rdev) < 2) { if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { dev_dbg(wm831x->dev, "DCDC%d over voltage\n", rdev_get_id(rdev) + 1); return REGULATOR_STATUS_ERROR; } if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { dev_dbg(wm831x->dev, "DCDC%d over current\n", rdev_get_id(rdev) + 1); return REGULATOR_STATUS_ERROR; } } /* Is the regulator on? */ ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); if (ret < 0) return ret; if (!(ret & (1 << rdev_get_id(rdev)))) return REGULATOR_STATUS_OFF; /* TODO: When we handle hardware control modes so we can report the * current mode. */ return REGULATOR_STATUS_ON; } static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) { struct wm831x_dcdc *dcdc = data; regulator_notifier_call_chain(dcdc->regulator, REGULATOR_EVENT_UNDER_VOLTAGE, NULL); return IRQ_HANDLED; } static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) { struct wm831x_dcdc *dcdc = data; regulator_notifier_call_chain(dcdc->regulator, REGULATOR_EVENT_OVER_CURRENT, NULL); return IRQ_HANDLED; } /* * BUCKV specifics */ static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, unsigned selector) { if (selector <= 0x8) return 600000; if (selector <= WM831X_BUCKV_MAX_SELECTOR) return 600000 + ((selector - 0x8) * 12500); return -EINVAL; } static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { u16 vsel; if (min_uV < 600000) vsel = 0; else if (min_uV <= 1800000) vsel = ((min_uV - 600000) / 12500) + 8; else return -EINVAL; if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) return -EINVAL; return vsel; } static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { u16 vsel; if (max_uV < 600000 || max_uV > 1800000) return -EINVAL; vsel = ((max_uV - 600000) / 12500) + 8; if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || wm831x_buckv_list_voltage(rdev, vsel) < max_uV) return -EINVAL; return vsel; } static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); if (state == dcdc->dvs_gpio_state) return 0; dcdc->dvs_gpio_state = state; gpio_set_value(dcdc->dvs_gpio, state); /* Should wait for DVS state change to be asserted if we have * a GPIO for it, for now assume the device is configured * for the fastest possible transition. */ return 0; } static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned *selector) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; int vsel, ret; vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); if (vsel < 0) return vsel; *selector = vsel; /* If this value is already set then do a GPIO update if we can */ if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) return wm831x_buckv_set_dvs(rdev, 0); if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) return wm831x_buckv_set_dvs(rdev, 1); /* Always set the ON status to the minimum voltage */ ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); if (ret < 0) return ret; dcdc->on_vsel = vsel; if (!dcdc->dvs_gpio) return ret; /* Kick the voltage transition now */ ret = wm831x_buckv_set_dvs(rdev, 0); if (ret < 0) return ret; /* Set the high voltage as the DVS voltage. This is optimised * for CPUfreq usage, most processors will keep the maximum * voltage constant and lower the minimum with the frequency. */ vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); if (vsel < 0) { /* This should never happen - at worst the same vsel * should be chosen */ WARN_ON(vsel < 0); return 0; } /* Don't bother if it's the same VSEL we're already using */ if (vsel == dcdc->on_vsel) return 0; ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); if (ret == 0) dcdc->dvs_vsel = vsel; else dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", ret); return 0; } static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; int vsel; vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); if (vsel < 0) return vsel; return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); } static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) return dcdc->dvs_vsel; else return dcdc->on_vsel; } /* Current limit options */ static u16 wm831x_dcdc_ilim[] = { 125, 250, 375, 500, 625, 750, 875, 1000 }; static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; int i; for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { if (max_uA <= wm831x_dcdc_ilim[i]) break; } if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) return -EINVAL; return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); } static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; int val; val = wm831x_reg_read(wm831x, reg); if (val < 0) return val; return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; } static struct regulator_ops wm831x_buckv_ops = { .set_voltage = wm831x_buckv_set_voltage, .get_voltage_sel = wm831x_buckv_get_voltage_sel, .list_voltage = wm831x_buckv_list_voltage, .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, .set_current_limit = wm831x_buckv_set_current_limit, .get_current_limit = wm831x_buckv_get_current_limit, .is_enabled = wm831x_dcdc_is_enabled, .enable = wm831x_dcdc_enable, .disable = wm831x_dcdc_disable, .get_status = wm831x_dcdc_get_status, .get_mode = wm831x_dcdc_get_mode, .set_mode = wm831x_dcdc_set_mode, .set_suspend_mode = wm831x_dcdc_set_suspend_mode, }; /* * Set up DVS control. We just log errors since we can still run * (with reduced performance) if we fail. */ static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, struct wm831x_buckv_pdata *pdata) { struct wm831x *wm831x = dcdc->wm831x; int ret; u16 ctrl; if (!pdata || !pdata->dvs_gpio) return; switch (pdata->dvs_control_src) { case 1: ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; break; case 2: ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; break; default: dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", pdata->dvs_control_src, dcdc->name); return; } ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, WM831X_DC1_DVS_SRC_MASK, ctrl); if (ret < 0) { dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", dcdc->name, ret); return; } ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); if (ret < 0) { dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", dcdc->name, ret); return; } /* gpiolib won't let us read the GPIO status so pick the higher * of the two existing voltages so we take it as platform data. */ dcdc->dvs_gpio_state = pdata->dvs_init_state; ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); if (ret < 0) { dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", dcdc->name, ret); gpio_free(pdata->dvs_gpio); return; } dcdc->dvs_gpio = pdata->dvs_gpio; } static __devinit int wm831x_buckv_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id; struct wm831x_dcdc *dcdc; struct resource *res; int ret, irq; if (pdata && pdata->wm831x_num) id = (pdata->wm831x_num * 10) + 1; else id = 0; id = pdev->id - id; dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); if (pdata == NULL || pdata->dcdc[id] == NULL) return -ENODEV; dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); if (dcdc == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } dcdc->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } dcdc->base = res->start; snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); dcdc->desc.name = dcdc->name; dcdc->desc.id = id; dcdc->desc.type = REGULATOR_VOLTAGE; dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; dcdc->desc.ops = &wm831x_buckv_ops; dcdc->desc.owner = THIS_MODULE; ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); if (ret < 0) { dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); goto err; } dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); if (ret < 0) { dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); goto err; } dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; if (pdata->dcdc[id]) wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, pdata->dcdc[id], dcdc); if (IS_ERR(dcdc->regulator)) { ret = PTR_ERR(dcdc->regulator); dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", id + 1, ret); goto err; } irq = platform_get_irq_byname(pdev, "UV"); ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, IRQF_TRIGGER_RISING, dcdc->name, dcdc); if (ret != 0) { dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", irq, ret); goto err_regulator; } irq = platform_get_irq_byname(pdev, "HC"); ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, IRQF_TRIGGER_RISING, dcdc->name, dcdc); if (ret != 0) { dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", irq, ret); goto err_uv; } platform_set_drvdata(pdev, dcdc); return 0; err_uv: free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); err_regulator: regulator_unregister(dcdc->regulator); err: if (dcdc->dvs_gpio) gpio_free(dcdc->dvs_gpio); kfree(dcdc); return ret; } static __devexit int wm831x_buckv_remove(struct platform_device *pdev) { struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); regulator_unregister(dcdc->regulator); if (dcdc->dvs_gpio) gpio_free(dcdc->dvs_gpio); kfree(dcdc); return 0; } static struct platform_driver wm831x_buckv_driver = { .probe = wm831x_buckv_probe, .remove = __devexit_p(wm831x_buckv_remove), .driver = { .name = "wm831x-buckv", .owner = THIS_MODULE, }, }; /* * BUCKP specifics */ static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, unsigned selector) { if (selector <= WM831X_BUCKP_MAX_SELECTOR) return 850000 + (selector * 25000); else return -EINVAL; } static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, int min_uV, int max_uV, int *selector) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 vsel; if (min_uV <= 34000000) vsel = (min_uV - 850000) / 25000; else return -EINVAL; if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) return -EINVAL; *selector = vsel; return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); } static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned *selector) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, selector); } static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; unsigned selector; return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); } static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; int val; val = wm831x_reg_read(wm831x, reg); if (val < 0) return val; return val & WM831X_DC3_ON_VSEL_MASK; } static struct regulator_ops wm831x_buckp_ops = { .set_voltage = wm831x_buckp_set_voltage, .get_voltage_sel = wm831x_buckp_get_voltage_sel, .list_voltage = wm831x_buckp_list_voltage, .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, .is_enabled = wm831x_dcdc_is_enabled, .enable = wm831x_dcdc_enable, .disable = wm831x_dcdc_disable, .get_status = wm831x_dcdc_get_status, .get_mode = wm831x_dcdc_get_mode, .set_mode = wm831x_dcdc_set_mode, .set_suspend_mode = wm831x_dcdc_set_suspend_mode, }; static __devinit int wm831x_buckp_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id; struct wm831x_dcdc *dcdc; struct resource *res; int ret, irq; if (pdata && pdata->wm831x_num) id = (pdata->wm831x_num * 10) + 1; else id = 0; id = pdev->id - id; dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); if (pdata == NULL || pdata->dcdc[id] == NULL) return -ENODEV; dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); if (dcdc == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } dcdc->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } dcdc->base = res->start; snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); dcdc->desc.name = dcdc->name; dcdc->desc.id = id; dcdc->desc.type = REGULATOR_VOLTAGE; dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; dcdc->desc.ops = &wm831x_buckp_ops; dcdc->desc.owner = THIS_MODULE; dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, pdata->dcdc[id], dcdc); if (IS_ERR(dcdc->regulator)) { ret = PTR_ERR(dcdc->regulator); dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", id + 1, ret); goto err; } irq = platform_get_irq_byname(pdev, "UV"); ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, IRQF_TRIGGER_RISING, dcdc->name, dcdc); if (ret != 0) { dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", irq, ret); goto err_regulator; } platform_set_drvdata(pdev, dcdc); return 0; err_regulator: regulator_unregister(dcdc->regulator); err: kfree(dcdc); return ret; } static __devexit int wm831x_buckp_remove(struct platform_device *pdev) { struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); regulator_unregister(dcdc->regulator); kfree(dcdc); return 0; } static struct platform_driver wm831x_buckp_driver = { .probe = wm831x_buckp_probe, .remove = __devexit_p(wm831x_buckp_remove), .driver = { .name = "wm831x-buckp", .owner = THIS_MODULE, }, }; /* * DCDC boost convertors */ static int wm831x_boostp_get_status(struct regulator_dev *rdev) { struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); struct wm831x *wm831x = dcdc->wm831x; int ret; /* First, check for errors */ ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); if (ret < 0) return ret; if (ret & (1 << rdev_get_id(rdev))) { dev_dbg(wm831x->dev, "DCDC%d under voltage\n", rdev_get_id(rdev) + 1); return REGULATOR_STATUS_ERROR; } /* Is the regulator on? */ ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); if (ret < 0) return ret; if (ret & (1 << rdev_get_id(rdev))) return REGULATOR_STATUS_ON; else return REGULATOR_STATUS_OFF; } static struct regulator_ops wm831x_boostp_ops = { .get_status = wm831x_boostp_get_status, .is_enabled = wm831x_dcdc_is_enabled, .enable = wm831x_dcdc_enable, .disable = wm831x_dcdc_disable, }; static __devinit int wm831x_boostp_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->dcdc); struct wm831x_dcdc *dcdc; struct resource *res; int ret, irq; dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); if (pdata == NULL || pdata->dcdc[id] == NULL) return -ENODEV; dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); if (dcdc == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } dcdc->wm831x = wm831x; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (res == NULL) { dev_err(&pdev->dev, "No I/O resource\n"); ret = -EINVAL; goto err; } dcdc->base = res->start; snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); dcdc->desc.name = dcdc->name; dcdc->desc.id = id; dcdc->desc.type = REGULATOR_VOLTAGE; dcdc->desc.ops = &wm831x_boostp_ops; dcdc->desc.owner = THIS_MODULE; dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, pdata->dcdc[id], dcdc); if (IS_ERR(dcdc->regulator)) { ret = PTR_ERR(dcdc->regulator); dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", id + 1, ret); goto err; } irq = platform_get_irq_byname(pdev, "UV"); ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, IRQF_TRIGGER_RISING, dcdc->name, dcdc); if (ret != 0) { dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", irq, ret); goto err_regulator; } platform_set_drvdata(pdev, dcdc); return 0; err_regulator: regulator_unregister(dcdc->regulator); err: kfree(dcdc); return ret; } static __devexit int wm831x_boostp_remove(struct platform_device *pdev) { struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); regulator_unregister(dcdc->regulator); kfree(dcdc); return 0; } static struct platform_driver wm831x_boostp_driver = { .probe = wm831x_boostp_probe, .remove = __devexit_p(wm831x_boostp_remove), .driver = { .name = "wm831x-boostp", .owner = THIS_MODULE, }, }; /* * External Power Enable * * These aren't actually DCDCs but look like them in hardware so share * code. */ #define WM831X_EPE_BASE 6 static struct regulator_ops wm831x_epe_ops = { .is_enabled = wm831x_dcdc_is_enabled, .enable = wm831x_dcdc_enable, .disable = wm831x_dcdc_disable, .get_status = wm831x_dcdc_get_status, }; static __devinit int wm831x_epe_probe(struct platform_device *pdev) { struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); struct wm831x_pdata *pdata = wm831x->dev->platform_data; int id = pdev->id % ARRAY_SIZE(pdata->epe); struct wm831x_dcdc *dcdc; int ret; dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); if (pdata == NULL || pdata->epe[id] == NULL) return -ENODEV; dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); if (dcdc == NULL) { dev_err(&pdev->dev, "Unable to allocate private data\n"); return -ENOMEM; } dcdc->wm831x = wm831x; /* For current parts this is correct; probably need to revisit * in future. */ snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); dcdc->desc.name = dcdc->name; dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ dcdc->desc.ops = &wm831x_epe_ops; dcdc->desc.type = REGULATOR_VOLTAGE; dcdc->desc.owner = THIS_MODULE; dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, pdata->epe[id], dcdc); if (IS_ERR(dcdc->regulator)) { ret = PTR_ERR(dcdc->regulator); dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", id + 1, ret); goto err; } platform_set_drvdata(pdev, dcdc); return 0; err: kfree(dcdc); return ret; } static __devexit int wm831x_epe_remove(struct platform_device *pdev) { struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); platform_set_drvdata(pdev, NULL); regulator_unregister(dcdc->regulator); kfree(dcdc); return 0; } static struct platform_driver wm831x_epe_driver = { .probe = wm831x_epe_probe, .remove = __devexit_p(wm831x_epe_remove), .driver = { .name = "wm831x-epe", .owner = THIS_MODULE, }, }; static int __init wm831x_dcdc_init(void) { int ret; ret = platform_driver_register(&wm831x_buckv_driver); if (ret != 0) pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); ret = platform_driver_register(&wm831x_buckp_driver); if (ret != 0) pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); ret = platform_driver_register(&wm831x_boostp_driver); if (ret != 0) pr_err("Failed to register WM831x BOOST driver: %d\n", ret); ret = platform_driver_register(&wm831x_epe_driver); if (ret != 0) pr_err("Failed to register WM831x EPE driver: %d\n", ret); return 0; } subsys_initcall(wm831x_dcdc_init); static void __exit wm831x_dcdc_exit(void) { platform_driver_unregister(&wm831x_epe_driver); platform_driver_unregister(&wm831x_boostp_driver); platform_driver_unregister(&wm831x_buckp_driver); platform_driver_unregister(&wm831x_buckv_driver); } module_exit(wm831x_dcdc_exit); /* Module information */ MODULE_AUTHOR("Mark Brown"); MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:wm831x-buckv"); MODULE_ALIAS("platform:wm831x-buckp");