+++ /dev/null
-/* drivers/staging/rk2818/rk2818_adc.c
- *
- * 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.
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/sched.h>
-#include <linux/list.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-
-#include <mach/rk2818_iomap.h>
-#include <mach/rk2818_adc.h>
-
-/* This driver is designed to control the usage of the ADC block between
- * the keyboard and any other drivers that may need to use it.
- *
- * 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.
- */
-
-struct rk28_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 rk28_adc_client *c, unsigned selected);
- void (*convert_cb)(struct rk28_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 rk28_adc_client *cur;
- struct rk28_adc_client *ts_pend;
- void __iomem *regs;
-
- unsigned int pre_con;
- int irq;
-};
-
-static struct adc_device *adc_dev;
-
-static LIST_HEAD(adc_pending);
-
-#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
-
-static inline void rk28_adc_int_enable(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con |= RK28_ADC_INT_ENABLE;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_int_disable(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con &= RK28_ADC_INT_DISABLE;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_int_clear(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con &= RK28_ADC_INT_CLEAR;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_power_up(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con |= RK28_ADC_POWER_UP;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_power_down(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con &= RK28_ADC_POWER_DOWN;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_convert(struct adc_device *adc)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
- con |= RK28_ADC_POWER_UP | RK28_ADC_CONV_START | RK28_ADC_INT_ENABLE;
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static inline void rk28_adc_select(struct adc_device *adc,
- struct rk28_adc_client *client)
-{
- unsigned con = readl(adc->regs + RK28_ADCCON);
-
- client->select_cb(client, 1);
-
- con &= RK28_ADC_MASK_CH;
- con &= RK28_ADC_CONV_STOP;
-
- if (!client->is_ts)
- con |= RK28_ADC_SEL_CH(client->channel);
-
- writel(con, adc->regs + RK28_ADCCON);
-}
-
-static void rk28_adc_dbgshow(struct adc_device *adc)
-{
- adc_dbg(adc, "CON=0x%x, STAS=0x%x, DATA=0x%x\n",
- readl(adc->regs + RK28_ADCCON),
- readl(adc->regs + RK28_ADCSTAS),
- readl(adc->regs + RK28_ADCDAT));
-}
-
-static void rk28_adc_try(struct adc_device *adc)
-{
- struct rk28_adc_client *next = adc->ts_pend;
-
- if (!next && !list_empty(&adc_pending)) {
- next = list_first_entry(&adc_pending,
- struct rk28_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;
- rk28_adc_select(adc, next);
- rk28_adc_convert(adc);
- rk28_adc_dbgshow(adc);
- }
-}
-
-int rk28_adc_start(struct rk28_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;
- }
-
- if (client->is_ts && adc->ts_pend)
- return -EAGAIN;
-
- local_irq_save(flags);
-
- 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)
- rk28_adc_try(adc);
- local_irq_restore(flags);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(rk28_adc_start);
-
-static void rk28_convert_done(struct rk28_adc_client *client,
- unsigned v, unsigned u, unsigned *left)
-{
- client->result = v;
- wake_up(client->wait);
-}
-
-int rk28_adc_read(struct rk28_adc_client *client, unsigned int ch)
-{
- DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wake);
- int ret;
-
- client->convert_cb = rk28_convert_done;
- client->wait = &wake;
- client->result = -1;
-
- ret = rk28_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(rk28_adc_read);
-
-static void rk28_adc_default_select(struct rk28_adc_client *client,
- unsigned select)
-{
-}
-
-struct rk28_adc_client *rk28_adc_register(struct platform_device *pdev,
- void (*select)(struct rk28_adc_client *client,
- unsigned int selected),
- void (*conv)(struct rk28_adc_client *client,
- unsigned d0, unsigned d1,
- unsigned *samples_left),
- unsigned int is_ts)
-{
- struct rk28_adc_client *client;
-
- WARN_ON(!pdev);
-
- if (!select)
- select = rk28_adc_default_select;
-
- if (!pdev)
- return ERR_PTR(-EINVAL);
-
- client = kzalloc(sizeof(struct rk28_adc_client), GFP_KERNEL);
- if (!client) {
- dev_err(&pdev->dev, "no memory for adc client\n");
- 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(rk28_adc_register);
-
-void rk28_adc_release(struct rk28_adc_client *client)
-{
- /* 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 rk28_adc_client *tmp;
-
- list_for_each_safe(p, n, &adc_pending) {
- tmp = list_entry(p, struct rk28_adc_client, pend);
- if (tmp == client)
- list_del(&tmp->pend);
- }
- }
-
- if (adc_dev->cur == NULL)
- rk28_adc_try(adc_dev);
- kfree(client);
-}
-EXPORT_SYMBOL_GPL(rk28_adc_release);
-
-static irqreturn_t rk28_adc_irq(int irq, void *pw)
-{
- struct adc_device *adc = pw;
- struct rk28_adc_client *client = adc->cur;
- unsigned long flags;
- unsigned data0, data1 = 0;
- rk28_adc_int_disable(adc);
- rk28_adc_int_clear(adc);
-
- if (!client) {
- dev_warn(&adc->pdev->dev, "%s: no adc pending\n", __func__);
- return IRQ_HANDLED;
- }
-
- data0 = readl(adc->regs + RK28_ADCDAT);
-
- adc_dbg(adc, "read %d: 0x%x\n", client->nr_samples, data0);
-
- client->nr_samples--;
-
- if (client->convert_cb)
- (client->convert_cb)(client, data0 & 0x3ff, data1 & 0x3ff,
- &client->nr_samples);
-
- if (client->nr_samples > 0) {
- /* fire another conversion for this */
-
- client->select_cb(client, 1);
- rk28_adc_convert(adc);
- } else {
- local_irq_save(flags);
- (client->select_cb)(client, 0);
- adc->cur = NULL;
-
- rk28_adc_try(adc);
- local_irq_restore(flags);
- }
-
- return IRQ_HANDLED;
-}
-
-static int rk28_adc_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct adc_device *adc;
- struct resource *regs;
- int ret;
-
- adc = kzalloc(sizeof(struct adc_device), GFP_KERNEL);
- if (adc == NULL) {
- dev_err(dev, "failed to allocate adc_device\n");
- return -ENOMEM;
- }
-
- adc->pdev = pdev;
-
- adc->irq = platform_get_irq(pdev, 0);
- if (adc->irq <= 0) {
- dev_err(dev, "failed to get adc irq\n");
- ret = -ENOENT;
- goto err_alloc;
- }
-
- ret = request_irq(adc->irq, rk28_adc_irq, 0, dev_name(dev), adc);
- if (ret < 0) {
- dev_err(dev, "failed to attach adc irq\n");
- goto err_alloc;
- }
-
- adc->clk = clk_get(dev, "lsadc");
- if (IS_ERR(adc->clk)) {
- dev_err(dev, "failed to get adc clock\n");
- ret = PTR_ERR(adc->clk);
- goto err_irq;
- }
-
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs) {
- dev_err(dev, "failed to find registers\n");
- ret = -ENXIO;
- goto err_clk;
- }
-
- adc->regs = ioremap(regs->start, resource_size(regs));
- if (!adc->regs) {
- dev_err(dev, "failed to map registers\n");
- ret = -ENXIO;
- goto err_clk;
- }
-
- clk_enable(adc->clk);
-
- dev_info(dev, "attached adc driver\n");
-
- platform_set_drvdata(pdev, adc);
-
- rk28_adc_int_disable(adc);
- adc_dev = adc;
- printk("Enter::%s,LINE=%d\n",__FUNCTION__,__LINE__);
- return 0;
-
- err_clk:
- clk_put(adc->clk);
-
- err_irq:
- free_irq(adc->irq, adc);
-
- err_alloc:
- kfree(adc);
- return ret;
-}
-
-static int rk28_adc_remove(struct platform_device *pdev)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
- rk28_adc_power_down(adc);
- iounmap(adc->regs);
- free_irq(adc->irq, adc);
- clk_disable(adc->clk);
- clk_put(adc->clk);
- kfree(adc);
-
- return 0;
-}
-
-#ifdef CONFIG_PM
-static int rk28_adc_suspend(struct platform_device *pdev, pm_message_t state)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
- u32 con;
-
- con = readl(adc->regs + RK28_ADCCON);
- adc->pre_con = con;
- con &= RK28_ADC_POWER_DOWN;
- writel(con, adc->regs + RK28_ADCCON);
-
- clk_disable(adc->clk);
-
- return 0;
-}
-
-static int rk28_adc_resume(struct platform_device *pdev)
-{
- struct adc_device *adc = platform_get_drvdata(pdev);
-
- clk_enable(adc->clk);
-
- writel(adc->pre_con, adc->regs + RK28_ADCCON);
- return 0;
-}
-
-#else
-#define rk28_adc_suspend NULL
-#define rk28_adc_resume NULL
-#endif
-
-static struct platform_driver rk28_adc_driver = {
- .driver = {
- .name = "rk2818-adc",
- .owner = THIS_MODULE,
- },
- .probe = rk28_adc_probe,
- .remove = __devexit_p(rk28_adc_remove),
- .suspend = rk28_adc_suspend,
- .resume = rk28_adc_resume,
-};
-
-static int __init adc_init(void)
-{
- int ret;
-
- ret = platform_driver_register(&rk28_adc_driver);
- if (ret)
- printk(KERN_ERR "%s: failed to add adc driver\n", __func__);
- printk("Enter::%s,LINE=%d\n",__FUNCTION__,__LINE__);
- return ret;
-}
-
-module_init(adc_init);
-MODULE_DESCRIPTION("rk28xx adc driver");
-MODULE_AUTHOR("luowei lw@rock-chips.com");
-MODULE_LICENSE("GPL");
-
projects / firefly-linux-kernel-4.4.55.git / commitdiff