diff options
Diffstat (limited to 'arch/arm/plat-samsung/adc.c')
-rw-r--r-- | arch/arm/plat-samsung/adc.c | 510 |
1 files changed, 0 insertions, 510 deletions
diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c deleted file mode 100644 index e35e04417cce..000000000000 --- a/arch/arm/plat-samsung/adc.c +++ /dev/null @@ -1,510 +0,0 @@ -// SPDX-License-Identifier: GPL-1.0+ -// -// Copyright (c) 2008 Simtec Electronics -// http://armlinux.simtec.co.uk/ -// Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org> -// -// Samsung ADC device core - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/mod_devicetable.h> -#include <linux/platform_device.h> -#include <linux/sched.h> -#include <linux/list.h> -#include <linux/slab.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/regulator/consumer.h> - -#include <plat/regs-adc.h> -#include <linux/soc/samsung/s3c-adc.h> - -/* This driver is designed to control the usage of the ADC block between - * the touchscreen and any other drivers that may need to use it, such as - * the hwmon driver. - * - * Priority will be given to the touchscreen driver, but as this itself is - * rate limited it should not starve other requests which are processed in - * order that they are received. - * - * Each user registers to get a client block which uniquely identifies it - * and stores information such as the necessary functions to callback when - * action is required. - */ - -enum s3c_cpu_type { - TYPE_ADCV1, /* S3C24XX */ - TYPE_ADCV11, /* S3C2443 */ - TYPE_ADCV12, /* S3C2416, S3C2450 */ - TYPE_ADCV2, /* S3C64XX */ - TYPE_ADCV3, /* S5PV210, S5PC110, Exynos4210 */ -}; - -struct s3c_adc_client { - struct platform_device *pdev; - struct list_head pend; - wait_queue_head_t *wait; - - unsigned int nr_samples; - int result; - unsigned char is_ts; - unsigned char channel; - - void (*select_cb)(struct s3c_adc_client *c, unsigned selected); - void (*convert_cb)(struct s3c_adc_client *c, - unsigned val1, unsigned val2, - unsigned *samples_left); -}; - -struct adc_device { - struct platform_device *pdev; - struct platform_device *owner; - struct clk *clk; - struct s3c_adc_client *cur; - struct s3c_adc_client *ts_pend; - void __iomem *regs; - spinlock_t lock; - - unsigned int prescale; - - int irq; - struct regulator *vdd; -}; - -static struct adc_device *adc_dev; - -static LIST_HEAD(adc_pending); /* protected by adc_device.lock */ - -#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg) - -static inline void s3c_adc_convert(struct adc_device *adc) -{ - unsigned con = readl(adc->regs + S3C2410_ADCCON); - - con |= S3C2410_ADCCON_ENABLE_START; - writel(con, adc->regs + S3C2410_ADCCON); -} - -static inline void s3c_adc_select(struct adc_device *adc, - struct s3c_adc_client *client) -{ - unsigned con = readl(adc->regs + S3C2410_ADCCON); - enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data; - - client->select_cb(client, 1); - - if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV2) - con &= ~S3C2410_ADCCON_MUXMASK; - con &= ~S3C2410_ADCCON_STDBM; - con &= ~S3C2410_ADCCON_STARTMASK; - - if (!client->is_ts) { - if (cpu == TYPE_ADCV3) - writel(client->channel & 0xf, adc->regs + S5P_ADCMUX); - else if (cpu == TYPE_ADCV11 || cpu == TYPE_ADCV12) - writel(client->channel & 0xf, - adc->regs + S3C2443_ADCMUX); - else - con |= S3C2410_ADCCON_SELMUX(client->channel); - } - - writel(con, adc->regs + S3C2410_ADCCON); -} - -static void s3c_adc_dbgshow(struct adc_device *adc) -{ - adc_dbg(adc, "CON=%08x, TSC=%08x, DLY=%08x\n", - readl(adc->regs + S3C2410_ADCCON), - readl(adc->regs + S3C2410_ADCTSC), - readl(adc->regs + S3C2410_ADCDLY)); -} - -static void s3c_adc_try(struct adc_device *adc) -{ - struct s3c_adc_client *next = adc->ts_pend; - - if (!next && !list_empty(&adc_pending)) { - next = list_first_entry(&adc_pending, - struct s3c_adc_client, pend); - list_del(&next->pend); - } else - adc->ts_pend = NULL; - - if (next) { - adc_dbg(adc, "new client is %p\n", next); - adc->cur = next; - s3c_adc_select(adc, next); - s3c_adc_convert(adc); - s3c_adc_dbgshow(adc); - } -} - -int s3c_adc_start(struct s3c_adc_client *client, - unsigned int channel, unsigned int nr_samples) -{ - struct adc_device *adc = adc_dev; - unsigned long flags; - - if (!adc) { - printk(KERN_ERR "%s: failed to find adc\n", __func__); - return -EINVAL; - } - - spin_lock_irqsave(&adc->lock, flags); - - if (client->is_ts && adc->ts_pend) { - spin_unlock_irqrestore(&adc->lock, flags); - return -EAGAIN; - } - - client->channel = channel; - client->nr_samples = nr_samples; - - if (client->is_ts) - adc->ts_pend = client; - else - list_add_tail(&client->pend, &adc_pending); - - if (!adc->cur) - s3c_adc_try(adc); - - spin_unlock_irqrestore(&adc->lock, flags); - - return 0; -} -EXPORT_SYMBOL_GPL(s3c_adc_start); - -static void s3c_convert_done(struct s3c_adc_client *client, - unsigned v, unsigned u, unsigned *left) -{ - client->result = v; - wake_up(client->wait); -} - -int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch) -{ - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake); - int ret; - - client->convert_cb = s3c_convert_done; - client->wait = &wake; - client->result = -1; - - ret = s3c_adc_start(client, ch, 1); - if (ret < 0) - goto err; - - ret = wait_event_timeout(wake, client->result >= 0, HZ / 2); - if (client->result < 0) { - ret = -ETIMEDOUT; - goto err; - } - - client->convert_cb = NULL; - return client->result; - -err: - return ret; -} -EXPORT_SYMBOL_GPL(s3c_adc_read); - -static void s3c_adc_default_select(struct s3c_adc_client *client, - unsigned select) -{ -} - -struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev, - void (*select)(struct s3c_adc_client *client, - unsigned int selected), - void (*conv)(struct s3c_adc_client *client, - unsigned d0, unsigned d1, - unsigned *samples_left), - unsigned int is_ts) -{ - struct s3c_adc_client *client; - - WARN_ON(!pdev); - - if (!select) - select = s3c_adc_default_select; - - if (!pdev) - return ERR_PTR(-EINVAL); - - client = kzalloc(sizeof(*client), GFP_KERNEL); - if (!client) - return ERR_PTR(-ENOMEM); - - client->pdev = pdev; - client->is_ts = is_ts; - client->select_cb = select; - client->convert_cb = conv; - - return client; -} -EXPORT_SYMBOL_GPL(s3c_adc_register); - -void s3c_adc_release(struct s3c_adc_client *client) -{ - unsigned long flags; - - spin_lock_irqsave(&adc_dev->lock, flags); - - /* We should really check that nothing is in progress. */ - if (adc_dev->cur == client) - adc_dev->cur = NULL; - if (adc_dev->ts_pend == client) - adc_dev->ts_pend = NULL; - else { - struct list_head *p, *n; - struct s3c_adc_client *tmp; - - list_for_each_safe(p, n, &adc_pending) { - tmp = list_entry(p, struct s3c_adc_client, pend); - if (tmp == client) - list_del(&tmp->pend); - } - } - - if (adc_dev->cur == NULL) - s3c_adc_try(adc_dev); - - spin_unlock_irqrestore(&adc_dev->lock, flags); - kfree(client); -} -EXPORT_SYMBOL_GPL(s3c_adc_release); - -static irqreturn_t s3c_adc_irq(int irq, void *pw) -{ - struct adc_device *adc = pw; - struct s3c_adc_client *client = adc->cur; - enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data; - unsigned data0, data1; - - if (!client) { - dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__); - goto exit; - } - - data0 = readl(adc->regs + S3C2410_ADCDAT0); - data1 = readl(adc->regs + S3C2410_ADCDAT1); - adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1); - - client->nr_samples--; - - if (cpu == TYPE_ADCV1 || cpu == TYPE_ADCV11) { - data0 &= 0x3ff; - data1 &= 0x3ff; - } else { - /* S3C2416/S3C64XX/S5P ADC resolution is 12-bit */ - data0 &= 0xfff; - data1 &= 0xfff; - } - - if (client->convert_cb) - (client->convert_cb)(client, data0, data1, &client->nr_samples); - - if (client->nr_samples > 0) { - /* fire another conversion for this */ - - client->select_cb(client, 1); - s3c_adc_convert(adc); - } else { - spin_lock(&adc->lock); - (client->select_cb)(client, 0); - adc->cur = NULL; - - s3c_adc_try(adc); - spin_unlock(&adc->lock); - } - -exit: - if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) { - /* Clear ADC interrupt */ - writel(0, adc->regs + S3C64XX_ADCCLRINT); - } - return IRQ_HANDLED; -} - -static int s3c_adc_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct adc_device *adc; - enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data; - int ret; - unsigned tmp; - - adc = devm_kzalloc(dev, sizeof(*adc), GFP_KERNEL); - if (!adc) - return -ENOMEM; - - spin_lock_init(&adc->lock); - - adc->pdev = pdev; - adc->prescale = S3C2410_ADCCON_PRSCVL(49); - - adc->vdd = devm_regulator_get(dev, "vdd"); - if (IS_ERR(adc->vdd)) { - dev_err(dev, "operating without regulator \"vdd\" .\n"); - return PTR_ERR(adc->vdd); - } - - adc->irq = platform_get_irq(pdev, 1); - if (adc->irq <= 0) - return -ENOENT; - - ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev), - adc); - if (ret < 0) { - dev_err(dev, "failed to attach adc irq\n"); - return ret; - } - - adc->clk = devm_clk_get(dev, "adc"); - if (IS_ERR(adc->clk)) { - dev_err(dev, "failed to get adc clock\n"); - return PTR_ERR(adc->clk); - } - - adc->regs = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(adc->regs)) - return PTR_ERR(adc->regs); - - ret = regulator_enable(adc->vdd); - if (ret) - return ret; - - clk_prepare_enable(adc->clk); - - tmp = adc->prescale | S3C2410_ADCCON_PRSCEN; - - /* Enable 12-bit ADC resolution */ - if (cpu == TYPE_ADCV12) - tmp |= S3C2416_ADCCON_RESSEL; - if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) - tmp |= S3C64XX_ADCCON_RESSEL; - - writel(tmp, adc->regs + S3C2410_ADCCON); - - dev_info(dev, "attached adc driver\n"); - - platform_set_drvdata(pdev, adc); - adc_dev = adc; - - return 0; -} - -static int s3c_adc_remove(struct platform_device *pdev) -{ - struct adc_device *adc = platform_get_drvdata(pdev); - - clk_disable_unprepare(adc->clk); - regulator_disable(adc->vdd); - - return 0; -} - -#ifdef CONFIG_PM -static int s3c_adc_suspend(struct device *dev) -{ - struct adc_device *adc = dev_get_drvdata(dev); - unsigned long flags; - u32 con; - - spin_lock_irqsave(&adc->lock, flags); - - con = readl(adc->regs + S3C2410_ADCCON); - con |= S3C2410_ADCCON_STDBM; - writel(con, adc->regs + S3C2410_ADCCON); - - disable_irq(adc->irq); - spin_unlock_irqrestore(&adc->lock, flags); - clk_disable(adc->clk); - regulator_disable(adc->vdd); - - return 0; -} - -static int s3c_adc_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct adc_device *adc = platform_get_drvdata(pdev); - enum s3c_cpu_type cpu = platform_get_device_id(pdev)->driver_data; - int ret; - unsigned long tmp; - - ret = regulator_enable(adc->vdd); - if (ret) - return ret; - clk_enable(adc->clk); - enable_irq(adc->irq); - - tmp = adc->prescale | S3C2410_ADCCON_PRSCEN; - - /* Enable 12-bit ADC resolution */ - if (cpu == TYPE_ADCV12) - tmp |= S3C2416_ADCCON_RESSEL; - if (cpu == TYPE_ADCV2 || cpu == TYPE_ADCV3) - tmp |= S3C64XX_ADCCON_RESSEL; - - writel(tmp, adc->regs + S3C2410_ADCCON); - - return 0; -} - -#else -#define s3c_adc_suspend NULL -#define s3c_adc_resume NULL -#endif - -static const struct platform_device_id s3c_adc_driver_ids[] = { - { - .name = "s3c24xx-adc", - .driver_data = TYPE_ADCV1, - }, { - .name = "s3c2443-adc", - .driver_data = TYPE_ADCV11, - }, { - .name = "s3c2416-adc", - .driver_data = TYPE_ADCV12, - }, { - .name = "s3c64xx-adc", - .driver_data = TYPE_ADCV2, - }, { - .name = "samsung-adc-v3", - .driver_data = TYPE_ADCV3, - }, - { } -}; -MODULE_DEVICE_TABLE(platform, s3c_adc_driver_ids); - -static const struct dev_pm_ops adc_pm_ops = { - .suspend = s3c_adc_suspend, - .resume = s3c_adc_resume, -}; - -static struct platform_driver s3c_adc_driver = { - .id_table = s3c_adc_driver_ids, - .driver = { - .name = "s3c-adc", - .pm = &adc_pm_ops, - }, - .probe = s3c_adc_probe, - .remove = s3c_adc_remove, -}; - -static int __init adc_init(void) -{ - int ret; - - ret = platform_driver_register(&s3c_adc_driver); - if (ret) - printk(KERN_ERR "%s: failed to add adc driver\n", __func__); - - return ret; -} - -module_init(adc_init); |