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16#include <linux/kernel.h>
17#include <linux/err.h>
18#include <linux/errno.h>
19#include <linux/input.h>
20#include <linux/platform_device.h>
21#include <linux/interrupt.h>
22#include <linux/slab.h>
23#include <linux/delay.h>
24#include <linux/io.h>
25#include <linux/clk.h>
26#include <linux/input/matrix_keypad.h>
27
28#define BITS(x) (BIT(x) - 1)
29
30#define KEYPAD_ROWS 9
31#define KEYPAD_COLS 9
32
33#define DEBOUNCE_MIN 0x400ul
34#define DEBOUNCE_MAX 0x3ffffffful
35
36struct keypad_regs {
37 u32 rev;
38 u32 mode;
39 u32 mask;
40 u32 pol;
41 u32 dclock;
42 u32 rclock;
43 u32 stable_cnt;
44 u32 in_en;
45 u32 out;
46 u32 out_en;
47 u32 in;
48 u32 lock;
49 u32 pres[3];
50};
51
52#define keypad_read(kp, reg) __raw_readl(&(kp)->regs->reg)
53#define keypad_write(kp, reg, val) __raw_writel(val, &(kp)->regs->reg)
54
55struct keypad_data {
56 struct input_dev *input_dev;
57 struct resource *res;
58 struct keypad_regs __iomem *regs;
59 struct clk *clk;
60 struct device *dev;
61 spinlock_t lock;
62 u32 irq_press;
63 u32 irq_release;
64 int rows, cols, row_shift;
65 int debounce_ms, active_low;
66 u32 prev_keys[3];
67 unsigned short keycodes[];
68};
69
70static irqreturn_t keypad_irq(int irq, void *data)
71{
72 struct keypad_data *kp = data;
73 int i, bit, val, row, col, code;
74 unsigned long flags;
75 u32 curr_keys[3];
76 u32 change;
77
78 spin_lock_irqsave(&kp->lock, flags);
79
80 memset(curr_keys, 0, sizeof(curr_keys));
81 if (irq == kp->irq_press)
82 for (i = 0; i < 3; i++)
83 curr_keys[i] = keypad_read(kp, pres[i]);
84
85 for (i = 0; i < 3; i++) {
86 change = curr_keys[i] ^ kp->prev_keys[i];
87
88 while (change) {
89 bit = fls(change) - 1;
90 change ^= BIT(bit);
91 val = curr_keys[i] & BIT(bit);
92 bit += i * 32;
93 row = bit / KEYPAD_COLS;
94 col = bit % KEYPAD_COLS;
95
96 code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
97 input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
98 input_report_key(kp->input_dev, kp->keycodes[code],
99 val);
100 }
101 }
102 input_sync(kp->input_dev);
103 memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));
104
105 if (irq == kp->irq_press)
106 keypad_write(kp, lock, 0);
107
108 spin_unlock_irqrestore(&kp->lock, flags);
109
110 return IRQ_HANDLED;
111}
112
113static int keypad_start(struct input_dev *dev)
114{
115 struct keypad_data *kp = input_get_drvdata(dev);
116 unsigned long mask, debounce, clk_rate_khz;
117 unsigned long flags;
118
119 clk_enable(kp->clk);
120 clk_rate_khz = clk_get_rate(kp->clk) / 1000;
121
122 spin_lock_irqsave(&kp->lock, flags);
123
124
125 keypad_write(kp, mode, 0);
126
127 mask = BITS(kp->rows) << KEYPAD_COLS;
128 mask |= BITS(kp->cols);
129 keypad_write(kp, mask, ~mask);
130
131 keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
132 keypad_write(kp, stable_cnt, 3);
133
134 debounce = kp->debounce_ms * clk_rate_khz;
135 debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
136 keypad_write(kp, dclock, debounce);
137 keypad_write(kp, rclock, 4 * debounce);
138
139 keypad_write(kp, in_en, 1);
140
141 spin_unlock_irqrestore(&kp->lock, flags);
142
143 return 0;
144}
145
146static void keypad_stop(struct input_dev *dev)
147{
148 struct keypad_data *kp = input_get_drvdata(dev);
149
150 synchronize_irq(kp->irq_press);
151 synchronize_irq(kp->irq_release);
152 clk_disable(kp->clk);
153}
154
155static int __devinit keypad_probe(struct platform_device *pdev)
156{
157 const struct matrix_keypad_platform_data *pdata;
158 const struct matrix_keymap_data *keymap_data;
159 struct device *dev = &pdev->dev;
160 struct keypad_data *kp;
161 int error = 0, sz, row_shift;
162 u32 rev = 0;
163
164 pdata = pdev->dev.platform_data;
165 if (!pdata) {
166 dev_err(dev, "cannot find device data\n");
167 return -EINVAL;
168 }
169
170 keymap_data = pdata->keymap_data;
171 if (!keymap_data) {
172 dev_err(dev, "cannot find keymap data\n");
173 return -EINVAL;
174 }
175
176 row_shift = get_count_order(pdata->num_col_gpios);
177 sz = offsetof(struct keypad_data, keycodes);
178 sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
179 kp = kzalloc(sz, GFP_KERNEL);
180 if (!kp) {
181 dev_err(dev, "cannot allocate device info\n");
182 return -ENOMEM;
183 }
184
185 kp->dev = dev;
186 kp->rows = pdata->num_row_gpios;
187 kp->cols = pdata->num_col_gpios;
188 kp->row_shift = row_shift;
189 platform_set_drvdata(pdev, kp);
190 spin_lock_init(&kp->lock);
191
192 kp->irq_press = platform_get_irq_byname(pdev, "press");
193 kp->irq_release = platform_get_irq_byname(pdev, "release");
194 if (kp->irq_press < 0 || kp->irq_release < 0) {
195 dev_err(dev, "cannot determine device interrupts\n");
196 error = -ENODEV;
197 goto error_res;
198 }
199
200 kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
201 if (!kp->res) {
202 dev_err(dev, "cannot determine register area\n");
203 error = -ENODEV;
204 goto error_res;
205 }
206
207 if (!request_mem_region(kp->res->start, resource_size(kp->res),
208 pdev->name)) {
209 dev_err(dev, "cannot claim register memory\n");
210 kp->res = NULL;
211 error = -EINVAL;
212 goto error_res;
213 }
214
215 kp->regs = ioremap(kp->res->start, resource_size(kp->res));
216 if (!kp->regs) {
217 dev_err(dev, "cannot map register memory\n");
218 error = -ENOMEM;
219 goto error_map;
220 }
221
222 kp->clk = clk_get(dev, NULL);
223 if (IS_ERR(kp->clk)) {
224 dev_err(dev, "cannot claim device clock\n");
225 error = PTR_ERR(kp->clk);
226 goto error_clk;
227 }
228
229 error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0,
230 dev_name(dev), kp);
231 if (error < 0) {
232 dev_err(kp->dev, "Could not allocate keypad press key irq\n");
233 goto error_irq_press;
234 }
235
236 error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0,
237 dev_name(dev), kp);
238 if (error < 0) {
239 dev_err(kp->dev, "Could not allocate keypad release key irq\n");
240 goto error_irq_release;
241 }
242
243 kp->input_dev = input_allocate_device();
244 if (!kp->input_dev) {
245 dev_err(dev, "cannot allocate input device\n");
246 error = -ENOMEM;
247 goto error_input;
248 }
249 input_set_drvdata(kp->input_dev, kp);
250
251 kp->input_dev->name = pdev->name;
252 kp->input_dev->dev.parent = &pdev->dev;
253 kp->input_dev->open = keypad_start;
254 kp->input_dev->close = keypad_stop;
255 kp->input_dev->evbit[0] = BIT_MASK(EV_KEY);
256 if (!pdata->no_autorepeat)
257 kp->input_dev->evbit[0] |= BIT_MASK(EV_REP);
258
259 clk_enable(kp->clk);
260 rev = keypad_read(kp, rev);
261 kp->input_dev->id.bustype = BUS_HOST;
262 kp->input_dev->id.product = ((rev >> 8) & 0x07);
263 kp->input_dev->id.version = ((rev >> 16) & 0xfff);
264 clk_disable(kp->clk);
265
266 kp->input_dev->keycode = kp->keycodes;
267 kp->input_dev->keycodesize = sizeof(kp->keycodes[0]);
268 kp->input_dev->keycodemax = kp->rows << kp->row_shift;
269
270 matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes,
271 kp->input_dev->keybit);
272
273 input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);
274
275 error = input_register_device(kp->input_dev);
276 if (error < 0) {
277 dev_err(dev, "Could not register input device\n");
278 goto error_reg;
279 }
280
281 return 0;
282
283
284error_reg:
285 input_free_device(kp->input_dev);
286error_input:
287 free_irq(kp->irq_release, kp);
288error_irq_release:
289 free_irq(kp->irq_press, kp);
290error_irq_press:
291 clk_put(kp->clk);
292error_clk:
293 iounmap(kp->regs);
294error_map:
295 release_mem_region(kp->res->start, resource_size(kp->res));
296error_res:
297 platform_set_drvdata(pdev, NULL);
298 kfree(kp);
299 return error;
300}
301
302static int __devexit keypad_remove(struct platform_device *pdev)
303{
304 struct keypad_data *kp = platform_get_drvdata(pdev);
305
306 free_irq(kp->irq_press, kp);
307 free_irq(kp->irq_release, kp);
308 input_unregister_device(kp->input_dev);
309 clk_put(kp->clk);
310 iounmap(kp->regs);
311 release_mem_region(kp->res->start, resource_size(kp->res));
312 platform_set_drvdata(pdev, NULL);
313 kfree(kp);
314
315 return 0;
316}
317
318static struct platform_driver keypad_driver = {
319 .probe = keypad_probe,
320 .remove = __devexit_p(keypad_remove),
321 .driver.name = "tnetv107x-keypad",
322 .driver.owner = THIS_MODULE,
323};
324
325static int __init keypad_init(void)
326{
327 return platform_driver_register(&keypad_driver);
328}
329
330static void __exit keypad_exit(void)
331{
332 platform_driver_unregister(&keypad_driver);
333}
334
335module_init(keypad_init);
336module_exit(keypad_exit);
337
338MODULE_AUTHOR("Cyril Chemparathy");
339MODULE_DESCRIPTION("TNETV107X Keypad Driver");
340MODULE_ALIAS("platform:tnetv107x-keypad");
341MODULE_LICENSE("GPL");
342
