1 /* drivers/adc/chips/rk30_adc.c
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3 * This program is free software; you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
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5 * the Free Software Foundation; either version 2 of the License.
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7 #include <linux/kernel.h>
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8 #include <linux/module.h>
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9 #include <linux/init.h>
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10 #include <linux/device.h>
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11 #include <linux/platform_device.h>
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12 #include <linux/err.h>
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13 #include <linux/clk.h>
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14 #include <linux/interrupt.h>
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15 #include <linux/io.h>
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16 #include <linux/adc.h>
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17 #include <linux/delay.h>
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18 #include <linux/slab.h>
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21 #include "rk30_adc.h"
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25 struct rk30_adc_device {
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29 struct resource *ioarea;
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30 struct adc_host *adc;
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32 static void rk30_adc_start(struct adc_host *adc)
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34 struct rk30_adc_device *dev = adc_priv(adc);
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35 int chn = adc->cur->chn;
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37 writel(0, dev->regs + ADC_CTRL);
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38 writel(0x08, dev->regs + ADC_DELAY_PU_SOC);
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39 writel(ADC_CTRL_POWER_UP|ADC_CTRL_CH(chn)|ADC_CTRL_IRQ_ENABLE, dev->regs + ADC_CTRL);
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43 static void rk30_adc_stop(struct adc_host *adc)
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45 struct rk30_adc_device *dev = adc_priv(adc);
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47 writel(0, dev->regs + ADC_CTRL);
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49 static int rk30_adc_read(struct adc_host *adc)
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51 struct rk30_adc_device *dev = adc_priv(adc);
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53 udelay(SAMPLE_RATE);
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54 return readl(dev->regs + ADC_DATA) & ADC_DATA_MASK;
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56 static irqreturn_t rk30_adc_irq(int irq, void *data)
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58 struct rk30_adc_device *dev = data;
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60 adc_core_irq_handle(dev->adc);
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63 static const struct adc_ops rk30_adc_ops = {
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64 .start = rk30_adc_start,
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65 .stop = rk30_adc_stop,
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66 .read = rk30_adc_read,
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69 struct adc_test_data {
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70 struct adc_client *client;
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71 struct timer_list timer;
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72 struct work_struct timer_work;
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74 static void callback(struct adc_client *client, void *param, int result)
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76 dev_info(client->adc->dev, "[chn%d] async_read = %d\n", client->chn, result);
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79 static void adc_timer(unsigned long data)
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81 //int sync_read = 0;
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82 struct adc_test_data *test=(struct adc_test_data *)data;
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84 //sync_read = adc_sync_read(test->client);
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85 //dev_info(test->client->adc->dev, "[chn%d] sync_read = %d\n", 0, sync_read);
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86 schedule_work(&test->timer_work);
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87 add_timer(&test->timer);
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89 static void adc_timer_work(struct work_struct *work)
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92 struct adc_test_data *test = container_of(work, struct adc_test_data,
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94 adc_async_read(test->client);
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95 sync_read = adc_sync_read(test->client);
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96 dev_info(test->client->adc->dev, "[chn%d] sync_read = %d\n", 0, sync_read);
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99 static int rk30_adc_test(void)
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101 struct adc_test_data *test = NULL;
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103 test = kzalloc(sizeof(struct adc_test_data), GFP_KERNEL);
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105 test->client = adc_register(0, callback, NULL);
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106 INIT_WORK(&test->timer_work, adc_timer_work);
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107 setup_timer(&test->timer, adc_timer, (unsigned long)test);
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108 test->timer.expires = jiffies + 100;
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109 add_timer(&test->timer);
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116 static int rk30_adc_probe(struct platform_device *pdev)
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118 struct adc_host *adc = NULL;
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119 struct rk30_adc_device *dev;
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120 struct resource *res;
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123 adc = adc_alloc_host(sizeof(struct rk30_adc_device), &pdev->dev);
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126 spin_lock_init(&adc->lock);
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127 adc->dev = &pdev->dev;
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128 adc->is_suspended = 0;
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129 adc->ops = &rk30_adc_ops;
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130 dev = adc_priv(adc);
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132 dev->irq = platform_get_irq(pdev, 0);
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133 if (dev->irq <= 0) {
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134 dev_err(&pdev->dev, "failed to get adc irq\n");
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139 ret = request_irq(dev->irq, rk30_adc_irq, 0, pdev->name, dev);
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141 dev_err(&pdev->dev, "failed to attach adc irq\n");
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144 dev->clk = clk_get(&pdev->dev, "saradc");
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145 if (IS_ERR(dev->clk)) {
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146 dev_err(&pdev->dev, "failed to get adc clock\n");
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147 ret = PTR_ERR(dev->clk);
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151 ret = clk_set_rate(dev->clk, ADC_CLK_RATE * 1000 * 1000);
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153 dev_err(&pdev->dev, "failed to set adc clk\n");
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156 clk_enable(dev->clk);
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158 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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160 dev_err(&pdev->dev, "cannot find IO resource\n");
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164 dev->ioarea = request_mem_region(res->start, (res->end - res->start) + 1,
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166 if(dev->ioarea == NULL) {
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167 dev_err(&pdev->dev, "cannot request IO\n");
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171 dev->regs = ioremap(res->start, (res->end - res->start) + 1);
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173 dev_err(&pdev->dev, "cannot map IO\n");
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177 platform_set_drvdata(pdev, dev);
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178 dev_info(&pdev->dev, "rk30 adc: driver initialized\n");
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181 // iounmap(dev->regs);
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184 release_resource(dev->ioarea);
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185 kfree(dev->ioarea);
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186 clk_disable(dev->clk);
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192 free_irq(dev->irq, dev);
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195 adc_free_host(dev->adc);
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199 static int rk30_adc_remove(struct platform_device *pdev)
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201 struct rk30_adc_device *dev = platform_get_drvdata(pdev);
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203 iounmap(dev->regs);
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204 release_resource(dev->ioarea);
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205 kfree(dev->ioarea);
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206 free_irq(dev->irq, dev);
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207 clk_disable(dev->clk);
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209 adc_free_host(dev->adc);
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215 static int rk30_adc_suspend(struct platform_device *pdev, pm_message_t state)
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217 struct rk30_adc_device *dev = platform_get_drvdata(pdev);
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219 dev->adc->is_suspended = 1;
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223 static int rk30_adc_resume(struct platform_device *pdev)
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225 struct rk30_adc_device *dev = platform_get_drvdata(pdev);
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227 dev->adc->is_suspended = 0;
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232 #define rk30_adc_suspend NULL
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233 #define rk30_adc_resume NULL
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236 static struct platform_driver rk30_adc_driver = {
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238 .name = "rk30-adc",
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239 .owner = THIS_MODULE,
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241 .probe = rk30_adc_probe,
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242 .remove = __devexit_p(rk30_adc_remove),
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243 .suspend = rk30_adc_suspend,
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244 .resume = rk30_adc_resume,
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247 static int __init rk30_adc_init(void)
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249 return platform_driver_register(&rk30_adc_driver);
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251 subsys_initcall(rk30_adc_init);
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253 static void __exit rk30_adc_exit(void)
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255 platform_driver_unregister(&rk30_adc_driver);
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257 module_exit(rk30_adc_exit);
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259 MODULE_DESCRIPTION("Driver for ADC");
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260 MODULE_AUTHOR("kfx, kfx@rock-chips.com");
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261 MODULE_LICENSE("GPL");
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262 static int __init adc_test_init(void)
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270 module_init(adc_test_init);
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