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1 | /* |
2 | * TI Touch Screen / ADC MFD driver |
3 | * |
4 | * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as |
8 | * published by the Free Software Foundation version 2. |
9 | * |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
11 | * kind, whether express or implied; without even the implied warranty |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | */ |
15 | |
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 | |
30 | static 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 | |
38 | static 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 | |
44 | static 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 | |
51 | static 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 | |
61 | static 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 | /* Allocate memory for device */ |
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 | * The TSC_ADC_Subsystem has 2 clock domains |
137 | * OCP_CLK and ADC_CLK. |
138 | * The ADC clock is expected to run at target of 3MHz, |
139 | * and expected to capture 12-bit data at a rate of 200 KSPS. |
140 | * The TSC_ADC_SS controller design assumes the OCP clock is |
141 | * at least 6x faster than the ADC clock. |
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 | /* TSCADC_CLKDIV needs to be configured to the value minus 1 */ |
158 | clk_value = clk_value - 1; |
159 | tscadc_writel(tscadc, REG_CLKDIV, clk_value); |
160 | |
161 | /* Set the control register bits */ |
162 | ctrl = CNTRLREG_STEPCONFIGWRT | |
163 | CNTRLREG_TSCENB | |
164 | CNTRLREG_STEPID | |
165 | CNTRLREG_4WIRE; |
166 | tscadc_writel(tscadc, REG_CTRL, ctrl); |
167 | |
168 | /* Set register bits for Idle Config Mode */ |
169 | tscadc_idle_config(tscadc); |
170 | |
171 | /* Enable the TSC module enable bit */ |
172 | ctrl = tscadc_readl(tscadc, REG_CTRL); |
173 | ctrl |= CNTRLREG_TSCSSENB; |
174 | tscadc_writel(tscadc, REG_CTRL, ctrl); |
175 | |
176 | /* TSC Cell */ |
177 | cell = &tscadc->cells[TSC_CELL]; |
178 | cell->name = "tsc"; |
179 | cell->platform_data = tscadc; |
180 | cell->pdata_size = sizeof(*tscadc); |
181 | |
182 | /* ADC Cell */ |
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 | |
198 | err_disable_clk: |
199 | pm_runtime_put_sync(&pdev->dev); |
200 | pm_runtime_disable(&pdev->dev); |
201 | ret: |
202 | return err; |
203 | } |
204 | |
205 | static 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 |
220 | static 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 | |
230 | static 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 | /* context restore */ |
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 | |
250 | static 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 | |
259 | static 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 | |
270 | module_platform_driver(ti_tscadc_driver); |
271 | |
272 | MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver"); |
273 | MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); |
274 | MODULE_LICENSE("GPL"); |
275 |
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