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16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/err.h>
20#include <linux/io.h>
21#include <linux/clk.h>
22#include <linux/regmap.h>
23#include <linux/mfd/core.h>
24#include <linux/pm_runtime.h>
25
26#include <linux/mfd/ti_am335x_tscadc.h>
27#include <linux/input/ti_am335x_tsc.h>
28#include <linux/platform_data/ti_am335x_adc.h>
29
30static unsigned int tscadc_readl(struct ti_tscadc_dev *tsadc, unsigned int reg)
31{
32 unsigned int val;
33
34 regmap_read(tsadc->regmap_tscadc, reg, &val);
35 return val;
36}
37
38static void tscadc_writel(struct ti_tscadc_dev *tsadc, unsigned int reg,
39 unsigned int val)
40{
41 regmap_write(tsadc->regmap_tscadc, reg, val);
42}
43
44static const struct regmap_config tscadc_regmap_config = {
45 .name = "ti_tscadc",
46 .reg_bits = 32,
47 .reg_stride = 4,
48 .val_bits = 32,
49};
50
51static void tscadc_idle_config(struct ti_tscadc_dev *config)
52{
53 unsigned int idleconfig;
54
55 idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM |
56 STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN;
57
58 tscadc_writel(config, REG_IDLECONFIG, idleconfig);
59}
60
61static int ti_tscadc_probe(struct platform_device *pdev)
62{
63 struct ti_tscadc_dev *tscadc;
64 struct resource *res;
65 struct clk *clk;
66 struct mfd_tscadc_board *pdata = pdev->dev.platform_data;
67 struct mfd_cell *cell;
68 int err, ctrl;
69 int clk_value, clock_rate;
70 int tsc_wires, adc_channels = 0, total_channels;
71
72 if (!pdata) {
73 dev_err(&pdev->dev, "Could not find platform data\n");
74 return -EINVAL;
75 }
76
77 if (pdata->adc_init)
78 adc_channels = pdata->adc_init->adc_channels;
79
80 tsc_wires = pdata->tsc_init->wires;
81 total_channels = tsc_wires + adc_channels;
82
83 if (total_channels > 8) {
84 dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
85 return -EINVAL;
86 }
87
88 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
89 if (!res) {
90 dev_err(&pdev->dev, "no memory resource defined.\n");
91 return -EINVAL;
92 }
93
94
95 tscadc = devm_kzalloc(&pdev->dev,
96 sizeof(struct ti_tscadc_dev), GFP_KERNEL);
97 if (!tscadc) {
98 dev_err(&pdev->dev, "failed to allocate memory.\n");
99 return -ENOMEM;
100 }
101 tscadc->dev = &pdev->dev;
102
103 err = platform_get_irq(pdev, 0);
104 if (err < 0) {
105 dev_err(&pdev->dev, "no irq ID is specified.\n");
106 goto ret;
107 } else
108 tscadc->irq = err;
109
110 res = devm_request_mem_region(&pdev->dev,
111 res->start, resource_size(res), pdev->name);
112 if (!res) {
113 dev_err(&pdev->dev, "failed to reserve registers.\n");
114 return -EBUSY;
115 }
116
117 tscadc->tscadc_base = devm_ioremap(&pdev->dev,
118 res->start, resource_size(res));
119 if (!tscadc->tscadc_base) {
120 dev_err(&pdev->dev, "failed to map registers.\n");
121 return -ENOMEM;
122 }
123
124 tscadc->regmap_tscadc = devm_regmap_init_mmio(&pdev->dev,
125 tscadc->tscadc_base, &tscadc_regmap_config);
126 if (IS_ERR(tscadc->regmap_tscadc)) {
127 dev_err(&pdev->dev, "regmap init failed\n");
128 err = PTR_ERR(tscadc->regmap_tscadc);
129 goto ret;
130 }
131
132 pm_runtime_enable(&pdev->dev);
133 pm_runtime_get_sync(&pdev->dev);
134
135
136
137
138
139
140
141
142
143 clk = clk_get(&pdev->dev, "adc_tsc_fck");
144 if (IS_ERR(clk)) {
145 dev_err(&pdev->dev, "failed to get TSC fck\n");
146 err = PTR_ERR(clk);
147 goto err_disable_clk;
148 }
149 clock_rate = clk_get_rate(clk);
150 clk_put(clk);
151 clk_value = clock_rate / ADC_CLK;
152 if (clk_value < MAX_CLK_DIV) {
153 dev_err(&pdev->dev, "clock input less than min clock requirement\n");
154 err = -EINVAL;
155 goto err_disable_clk;
156 }
157
158 clk_value = clk_value - 1;
159 tscadc_writel(tscadc, REG_CLKDIV, clk_value);
160
161
162 ctrl = CNTRLREG_STEPCONFIGWRT |
163 CNTRLREG_TSCENB |
164 CNTRLREG_STEPID |
165 CNTRLREG_4WIRE;
166 tscadc_writel(tscadc, REG_CTRL, ctrl);
167
168
169 tscadc_idle_config(tscadc);
170
171
172 ctrl = tscadc_readl(tscadc, REG_CTRL);
173 ctrl |= CNTRLREG_TSCSSENB;
174 tscadc_writel(tscadc, REG_CTRL, ctrl);
175
176
177 cell = &tscadc->cells[TSC_CELL];
178 cell->name = "tsc";
179 cell->platform_data = tscadc;
180 cell->pdata_size = sizeof(*tscadc);
181
182
183 cell = &tscadc->cells[ADC_CELL];
184 cell->name = "tiadc";
185 cell->platform_data = tscadc;
186 cell->pdata_size = sizeof(*tscadc);
187
188 err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
189 TSCADC_CELLS, NULL, 0, NULL);
190 if (err < 0)
191 goto err_disable_clk;
192
193 device_init_wakeup(&pdev->dev, true);
194 platform_set_drvdata(pdev, tscadc);
195
196 return 0;
197
198err_disable_clk:
199 pm_runtime_put_sync(&pdev->dev);
200 pm_runtime_disable(&pdev->dev);
201ret:
202 return err;
203}
204
205static int ti_tscadc_remove(struct platform_device *pdev)
206{
207 struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);
208
209 tscadc_writel(tscadc, REG_SE, 0x00);
210
211 pm_runtime_put_sync(&pdev->dev);
212 pm_runtime_disable(&pdev->dev);
213
214 mfd_remove_devices(tscadc->dev);
215
216 return 0;
217}
218
219#ifdef CONFIG_PM
220static int tscadc_suspend(struct device *dev)
221{
222 struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
223
224 tscadc_writel(tscadc_dev, REG_SE, 0x00);
225 pm_runtime_put_sync(dev);
226
227 return 0;
228}
229
230static int tscadc_resume(struct device *dev)
231{
232 struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
233 unsigned int restore, ctrl;
234
235 pm_runtime_get_sync(dev);
236
237
238 ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_TSCENB |
239 CNTRLREG_STEPID | CNTRLREG_4WIRE;
240 tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
241 tscadc_idle_config(tscadc_dev);
242 tscadc_writel(tscadc_dev, REG_SE, STPENB_STEPENB);
243 restore = tscadc_readl(tscadc_dev, REG_CTRL);
244 tscadc_writel(tscadc_dev, REG_CTRL,
245 (restore | CNTRLREG_TSCSSENB));
246
247 return 0;
248}
249
250static const struct dev_pm_ops tscadc_pm_ops = {
251 .suspend = tscadc_suspend,
252 .resume = tscadc_resume,
253};
254#define TSCADC_PM_OPS (&tscadc_pm_ops)
255#else
256#define TSCADC_PM_OPS NULL
257#endif
258
259static struct platform_driver ti_tscadc_driver = {
260 .driver = {
261 .name = "ti_tscadc",
262 .owner = THIS_MODULE,
263 .pm = TSCADC_PM_OPS,
264 },
265 .probe = ti_tscadc_probe,
266 .remove = ti_tscadc_remove,
267
268};
269
270module_platform_driver(ti_tscadc_driver);
271
272MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver");
273MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
274MODULE_LICENSE("GPL");
275
