diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/mfd/wm831x-auxadc.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/mfd/wm831x-auxadc.c')
-rw-r--r-- | kernel/drivers/mfd/wm831x-auxadc.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/kernel/drivers/mfd/wm831x-auxadc.c b/kernel/drivers/mfd/wm831x-auxadc.c new file mode 100644 index 000000000..6ee3018d8 --- /dev/null +++ b/kernel/drivers/mfd/wm831x-auxadc.c @@ -0,0 +1,299 @@ +/* + * wm831x-auxadc.c -- AUXADC for Wolfson WM831x PMICs + * + * Copyright 2009-2011 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/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/mfd/core.h> +#include <linux/slab.h> +#include <linux/list.h> + +#include <linux/mfd/wm831x/core.h> +#include <linux/mfd/wm831x/pdata.h> +#include <linux/mfd/wm831x/irq.h> +#include <linux/mfd/wm831x/auxadc.h> +#include <linux/mfd/wm831x/otp.h> +#include <linux/mfd/wm831x/regulator.h> + +struct wm831x_auxadc_req { + struct list_head list; + enum wm831x_auxadc input; + int val; + struct completion done; +}; + +static int wm831x_auxadc_read_irq(struct wm831x *wm831x, + enum wm831x_auxadc input) +{ + struct wm831x_auxadc_req *req; + int ret; + bool ena = false; + + req = kzalloc(sizeof(*req), GFP_KERNEL); + if (!req) + return -ENOMEM; + + init_completion(&req->done); + req->input = input; + req->val = -ETIMEDOUT; + + mutex_lock(&wm831x->auxadc_lock); + + /* Enqueue the request */ + list_add(&req->list, &wm831x->auxadc_pending); + + ena = !wm831x->auxadc_active; + + if (ena) { + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, + WM831X_AUX_ENA, WM831X_AUX_ENA); + if (ret != 0) { + dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", + ret); + goto out; + } + } + + /* Enable the conversion if not already running */ + if (!(wm831x->auxadc_active & (1 << input))) { + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_SOURCE, + 1 << input, 1 << input); + if (ret != 0) { + dev_err(wm831x->dev, + "Failed to set AUXADC source: %d\n", ret); + goto out; + } + + wm831x->auxadc_active |= 1 << input; + } + + /* We convert at the fastest rate possible */ + if (ena) { + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, + WM831X_AUX_CVT_ENA | + WM831X_AUX_RATE_MASK, + WM831X_AUX_CVT_ENA | + WM831X_AUX_RATE_MASK); + if (ret != 0) { + dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", + ret); + goto out; + } + } + + mutex_unlock(&wm831x->auxadc_lock); + + /* Wait for an interrupt */ + wait_for_completion_timeout(&req->done, msecs_to_jiffies(500)); + + mutex_lock(&wm831x->auxadc_lock); + + list_del(&req->list); + ret = req->val; + +out: + mutex_unlock(&wm831x->auxadc_lock); + + kfree(req); + + return ret; +} + +static irqreturn_t wm831x_auxadc_irq(int irq, void *irq_data) +{ + struct wm831x *wm831x = irq_data; + struct wm831x_auxadc_req *req; + int ret, input, val; + + ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA); + if (ret < 0) { + dev_err(wm831x->dev, + "Failed to read AUXADC data: %d\n", ret); + return IRQ_NONE; + } + + input = ((ret & WM831X_AUX_DATA_SRC_MASK) + >> WM831X_AUX_DATA_SRC_SHIFT) - 1; + + if (input == 14) + input = WM831X_AUX_CAL; + + val = ret & WM831X_AUX_DATA_MASK; + + mutex_lock(&wm831x->auxadc_lock); + + /* Disable this conversion, we're about to complete all users */ + wm831x_set_bits(wm831x, WM831X_AUXADC_SOURCE, + 1 << input, 0); + wm831x->auxadc_active &= ~(1 << input); + + /* Turn off the entire convertor if idle */ + if (!wm831x->auxadc_active) + wm831x_reg_write(wm831x, WM831X_AUXADC_CONTROL, 0); + + /* Wake up any threads waiting for this request */ + list_for_each_entry(req, &wm831x->auxadc_pending, list) { + if (req->input == input) { + req->val = val; + complete(&req->done); + } + } + + mutex_unlock(&wm831x->auxadc_lock); + + return IRQ_HANDLED; +} + +static int wm831x_auxadc_read_polled(struct wm831x *wm831x, + enum wm831x_auxadc input) +{ + int ret, src, timeout; + + mutex_lock(&wm831x->auxadc_lock); + + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, + WM831X_AUX_ENA, WM831X_AUX_ENA); + if (ret < 0) { + dev_err(wm831x->dev, "Failed to enable AUXADC: %d\n", ret); + goto out; + } + + /* We force a single source at present */ + src = input; + ret = wm831x_reg_write(wm831x, WM831X_AUXADC_SOURCE, + 1 << src); + if (ret < 0) { + dev_err(wm831x->dev, "Failed to set AUXADC source: %d\n", ret); + goto out; + } + + ret = wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, + WM831X_AUX_CVT_ENA, WM831X_AUX_CVT_ENA); + if (ret < 0) { + dev_err(wm831x->dev, "Failed to start AUXADC: %d\n", ret); + goto disable; + } + + /* If we're not using interrupts then poll the + * interrupt status register */ + timeout = 5; + while (timeout) { + msleep(1); + + ret = wm831x_reg_read(wm831x, + WM831X_INTERRUPT_STATUS_1); + if (ret < 0) { + dev_err(wm831x->dev, + "ISR 1 read failed: %d\n", ret); + goto disable; + } + + /* Did it complete? */ + if (ret & WM831X_AUXADC_DATA_EINT) { + wm831x_reg_write(wm831x, + WM831X_INTERRUPT_STATUS_1, + WM831X_AUXADC_DATA_EINT); + break; + } else { + dev_err(wm831x->dev, + "AUXADC conversion timeout\n"); + ret = -EBUSY; + goto disable; + } + } + + ret = wm831x_reg_read(wm831x, WM831X_AUXADC_DATA); + if (ret < 0) { + dev_err(wm831x->dev, + "Failed to read AUXADC data: %d\n", ret); + goto disable; + } + + src = ((ret & WM831X_AUX_DATA_SRC_MASK) + >> WM831X_AUX_DATA_SRC_SHIFT) - 1; + + if (src == 14) + src = WM831X_AUX_CAL; + + if (src != input) { + dev_err(wm831x->dev, "Data from source %d not %d\n", + src, input); + ret = -EINVAL; + } else { + ret &= WM831X_AUX_DATA_MASK; + } + +disable: + wm831x_set_bits(wm831x, WM831X_AUXADC_CONTROL, WM831X_AUX_ENA, 0); +out: + mutex_unlock(&wm831x->auxadc_lock); + return ret; +} + +/** + * wm831x_auxadc_read: Read a value from the WM831x AUXADC + * + * @wm831x: Device to read from. + * @input: AUXADC input to read. + */ +int wm831x_auxadc_read(struct wm831x *wm831x, enum wm831x_auxadc input) +{ + return wm831x->auxadc_read(wm831x, input); +} +EXPORT_SYMBOL_GPL(wm831x_auxadc_read); + +/** + * wm831x_auxadc_read_uv: Read a voltage from the WM831x AUXADC + * + * @wm831x: Device to read from. + * @input: AUXADC input to read. + */ +int wm831x_auxadc_read_uv(struct wm831x *wm831x, enum wm831x_auxadc input) +{ + int ret; + + ret = wm831x_auxadc_read(wm831x, input); + if (ret < 0) + return ret; + + ret *= 1465; + + return ret; +} +EXPORT_SYMBOL_GPL(wm831x_auxadc_read_uv); + +void wm831x_auxadc_init(struct wm831x *wm831x) +{ + int ret; + + mutex_init(&wm831x->auxadc_lock); + INIT_LIST_HEAD(&wm831x->auxadc_pending); + + if (wm831x->irq) { + wm831x->auxadc_read = wm831x_auxadc_read_irq; + + ret = request_threaded_irq(wm831x_irq(wm831x, + WM831X_IRQ_AUXADC_DATA), + NULL, wm831x_auxadc_irq, 0, + "auxadc", wm831x); + if (ret < 0) { + dev_err(wm831x->dev, "AUXADC IRQ request failed: %d\n", + ret); + wm831x->auxadc_read = NULL; + } + } + + if (!wm831x->auxadc_read) + wm831x->auxadc_read = wm831x_auxadc_read_polled; +} |