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bc95df78 RK |
1 | /* |
2 | * SPEAr Keyboard Driver | |
3 | * Based on omap-keypad driver | |
4 | * | |
5 | * Copyright (C) 2010 ST Microelectronics | |
25d238b2 | 6 | * Rajeev Kumar <rajeevkumar.linux@gmail.com> |
bc95df78 RK |
7 | * |
8 | * This file is licensed under the terms of the GNU General Public | |
9 | * License version 2. This program is licensed "as is" without any | |
10 | * warranty of any kind, whether express or implied. | |
11 | */ | |
12 | ||
13 | #include <linux/clk.h> | |
14 | #include <linux/errno.h> | |
bc95df78 RK |
15 | #include <linux/interrupt.h> |
16 | #include <linux/input.h> | |
17 | #include <linux/io.h> | |
18 | #include <linux/irq.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
829c4f96 | 21 | #include <linux/of.h> |
bc95df78 RK |
22 | #include <linux/platform_device.h> |
23 | #include <linux/pm_wakeup.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/types.h> | |
6884b680 | 26 | #include <linux/platform_data/keyboard-spear.h> |
bc95df78 RK |
27 | |
28 | /* Keyboard Registers */ | |
f6f2efa3 | 29 | #define MODE_CTL_REG 0x00 |
e99191f0 SH |
30 | #define STATUS_REG 0x0C |
31 | #define DATA_REG 0x10 | |
bc95df78 RK |
32 | #define INTR_MASK 0x54 |
33 | ||
34 | /* Register Values */ | |
1932811f DT |
35 | #define NUM_ROWS 16 |
36 | #define NUM_COLS 16 | |
98e4d4d6 SH |
37 | #define MODE_CTL_PCLK_FREQ_SHIFT 9 |
38 | #define MODE_CTL_PCLK_FREQ_MSK 0x7F | |
1932811f | 39 | |
f6f2efa3 SH |
40 | #define MODE_CTL_KEYBOARD (0x2 << 0) |
41 | #define MODE_CTL_SCAN_RATE_10 (0x0 << 2) | |
42 | #define MODE_CTL_SCAN_RATE_20 (0x1 << 2) | |
43 | #define MODE_CTL_SCAN_RATE_40 (0x2 << 2) | |
44 | #define MODE_CTL_SCAN_RATE_80 (0x3 << 2) | |
45 | #define MODE_CTL_KEYNUM_SHIFT 6 | |
46 | #define MODE_CTL_START_SCAN (0x1 << 8) | |
47 | ||
48 | #define STATUS_DATA_AVAIL (0x1 << 1) | |
49 | ||
50 | #define DATA_ROW_MASK 0xF0 | |
51 | #define DATA_COLUMN_MASK 0x0F | |
52 | ||
53 | #define ROW_SHIFT 4 | |
bc95df78 RK |
54 | |
55 | struct spear_kbd { | |
56 | struct input_dev *input; | |
bc95df78 RK |
57 | void __iomem *io_base; |
58 | struct clk *clk; | |
59 | unsigned int irq; | |
f8354c60 | 60 | unsigned int mode; |
1eee4af3 | 61 | unsigned int suspended_rate; |
bc95df78 | 62 | unsigned short last_key; |
1932811f | 63 | unsigned short keycodes[NUM_ROWS * NUM_COLS]; |
829c4f96 | 64 | bool rep; |
1eee4af3 | 65 | bool irq_wake_enabled; |
8314f532 | 66 | u32 mode_ctl_reg; |
bc95df78 RK |
67 | }; |
68 | ||
69 | static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id) | |
70 | { | |
71 | struct spear_kbd *kbd = dev_id; | |
72 | struct input_dev *input = kbd->input; | |
73 | unsigned int key; | |
e99191f0 | 74 | u32 sts, val; |
bc95df78 | 75 | |
e99191f0 | 76 | sts = readl_relaxed(kbd->io_base + STATUS_REG); |
f6f2efa3 | 77 | if (!(sts & STATUS_DATA_AVAIL)) |
bc95df78 RK |
78 | return IRQ_NONE; |
79 | ||
80 | if (kbd->last_key != KEY_RESERVED) { | |
81 | input_report_key(input, kbd->last_key, 0); | |
82 | kbd->last_key = KEY_RESERVED; | |
83 | } | |
84 | ||
85 | /* following reads active (row, col) pair */ | |
f6f2efa3 SH |
86 | val = readl_relaxed(kbd->io_base + DATA_REG) & |
87 | (DATA_ROW_MASK | DATA_COLUMN_MASK); | |
bc95df78 RK |
88 | key = kbd->keycodes[val]; |
89 | ||
90 | input_event(input, EV_MSC, MSC_SCAN, val); | |
91 | input_report_key(input, key, 1); | |
92 | input_sync(input); | |
93 | ||
94 | kbd->last_key = key; | |
95 | ||
96 | /* clear interrupt */ | |
e99191f0 | 97 | writel_relaxed(0, kbd->io_base + STATUS_REG); |
bc95df78 RK |
98 | |
99 | return IRQ_HANDLED; | |
100 | } | |
101 | ||
102 | static int spear_kbd_open(struct input_dev *dev) | |
103 | { | |
104 | struct spear_kbd *kbd = input_get_drvdata(dev); | |
105 | int error; | |
e99191f0 | 106 | u32 val; |
bc95df78 RK |
107 | |
108 | kbd->last_key = KEY_RESERVED; | |
109 | ||
110 | error = clk_enable(kbd->clk); | |
111 | if (error) | |
112 | return error; | |
113 | ||
98e4d4d6 SH |
114 | /* keyboard rate to be programmed is input clock (in MHz) - 1 */ |
115 | val = clk_get_rate(kbd->clk) / 1000000 - 1; | |
116 | val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT; | |
117 | ||
bc95df78 | 118 | /* program keyboard */ |
98e4d4d6 | 119 | val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val | |
f6f2efa3 SH |
120 | (kbd->mode << MODE_CTL_KEYNUM_SHIFT); |
121 | writel_relaxed(val, kbd->io_base + MODE_CTL_REG); | |
e99191f0 | 122 | writel_relaxed(1, kbd->io_base + STATUS_REG); |
bc95df78 RK |
123 | |
124 | /* start key scan */ | |
f6f2efa3 SH |
125 | val = readl_relaxed(kbd->io_base + MODE_CTL_REG); |
126 | val |= MODE_CTL_START_SCAN; | |
127 | writel_relaxed(val, kbd->io_base + MODE_CTL_REG); | |
bc95df78 RK |
128 | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static void spear_kbd_close(struct input_dev *dev) | |
133 | { | |
134 | struct spear_kbd *kbd = input_get_drvdata(dev); | |
e99191f0 | 135 | u32 val; |
bc95df78 RK |
136 | |
137 | /* stop key scan */ | |
f6f2efa3 SH |
138 | val = readl_relaxed(kbd->io_base + MODE_CTL_REG); |
139 | val &= ~MODE_CTL_START_SCAN; | |
140 | writel_relaxed(val, kbd->io_base + MODE_CTL_REG); | |
bc95df78 RK |
141 | |
142 | clk_disable(kbd->clk); | |
143 | ||
144 | kbd->last_key = KEY_RESERVED; | |
145 | } | |
146 | ||
829c4f96 | 147 | #ifdef CONFIG_OF |
5298cc4c | 148 | static int spear_kbd_parse_dt(struct platform_device *pdev, |
829c4f96 | 149 | struct spear_kbd *kbd) |
bc95df78 | 150 | { |
829c4f96 | 151 | struct device_node *np = pdev->dev.of_node; |
bc95df78 | 152 | int error; |
8314f532 | 153 | u32 val, suspended_rate; |
bc95df78 | 154 | |
829c4f96 VK |
155 | if (!np) { |
156 | dev_err(&pdev->dev, "Missing DT data\n"); | |
bc95df78 RK |
157 | return -EINVAL; |
158 | } | |
159 | ||
829c4f96 VK |
160 | if (of_property_read_bool(np, "autorepeat")) |
161 | kbd->rep = true; | |
162 | ||
8314f532 SH |
163 | if (of_property_read_u32(np, "suspended_rate", &suspended_rate)) |
164 | kbd->suspended_rate = suspended_rate; | |
165 | ||
829c4f96 VK |
166 | error = of_property_read_u32(np, "st,mode", &val); |
167 | if (error) { | |
168 | dev_err(&pdev->dev, "DT: Invalid or missing mode\n"); | |
169 | return error; | |
bc95df78 RK |
170 | } |
171 | ||
829c4f96 VK |
172 | kbd->mode = val; |
173 | return 0; | |
174 | } | |
175 | #else | |
176 | static inline int spear_kbd_parse_dt(struct platform_device *pdev, | |
177 | struct spear_kbd *kbd) | |
178 | { | |
179 | return -ENOSYS; | |
180 | } | |
181 | #endif | |
182 | ||
5298cc4c | 183 | static int spear_kbd_probe(struct platform_device *pdev) |
829c4f96 VK |
184 | { |
185 | struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev); | |
186 | const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL; | |
187 | struct spear_kbd *kbd; | |
188 | struct input_dev *input_dev; | |
189 | struct resource *res; | |
190 | int irq; | |
191 | int error; | |
192 | ||
bc95df78 RK |
193 | irq = platform_get_irq(pdev, 0); |
194 | if (irq < 0) { | |
195 | dev_err(&pdev->dev, "not able to get irq for the device\n"); | |
196 | return irq; | |
197 | } | |
198 | ||
6102752e VK |
199 | kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL); |
200 | if (!kbd) { | |
201 | dev_err(&pdev->dev, "not enough memory for driver data\n"); | |
202 | return -ENOMEM; | |
203 | } | |
204 | ||
205 | input_dev = devm_input_allocate_device(&pdev->dev); | |
206 | if (!input_dev) { | |
207 | dev_err(&pdev->dev, "unable to allocate input device\n"); | |
208 | return -ENOMEM; | |
bc95df78 RK |
209 | } |
210 | ||
211 | kbd->input = input_dev; | |
212 | kbd->irq = irq; | |
829c4f96 VK |
213 | |
214 | if (!pdata) { | |
215 | error = spear_kbd_parse_dt(pdev, kbd); | |
216 | if (error) | |
6102752e | 217 | return error; |
829c4f96 VK |
218 | } else { |
219 | kbd->mode = pdata->mode; | |
220 | kbd->rep = pdata->rep; | |
8314f532 | 221 | kbd->suspended_rate = pdata->suspended_rate; |
829c4f96 | 222 | } |
f8354c60 | 223 | |
ef0aca7f | 224 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
8d1cbc98 TR |
225 | kbd->io_base = devm_ioremap_resource(&pdev->dev, res); |
226 | if (IS_ERR(kbd->io_base)) | |
227 | return PTR_ERR(kbd->io_base); | |
bc95df78 | 228 | |
6102752e VK |
229 | kbd->clk = devm_clk_get(&pdev->dev, NULL); |
230 | if (IS_ERR(kbd->clk)) | |
231 | return PTR_ERR(kbd->clk); | |
bc95df78 RK |
232 | |
233 | input_dev->name = "Spear Keyboard"; | |
234 | input_dev->phys = "keyboard/input0"; | |
bc95df78 RK |
235 | input_dev->id.bustype = BUS_HOST; |
236 | input_dev->id.vendor = 0x0001; | |
237 | input_dev->id.product = 0x0001; | |
238 | input_dev->id.version = 0x0100; | |
239 | input_dev->open = spear_kbd_open; | |
240 | input_dev->close = spear_kbd_close; | |
241 | ||
1932811f DT |
242 | error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS, |
243 | kbd->keycodes, input_dev); | |
244 | if (error) { | |
245 | dev_err(&pdev->dev, "Failed to build keymap\n"); | |
6102752e | 246 | return error; |
1932811f DT |
247 | } |
248 | ||
829c4f96 | 249 | if (kbd->rep) |
bc95df78 RK |
250 | __set_bit(EV_REP, input_dev->evbit); |
251 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); | |
252 | ||
bc95df78 RK |
253 | input_set_drvdata(input_dev, kbd); |
254 | ||
6102752e VK |
255 | error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0, |
256 | "keyboard", kbd); | |
bc95df78 | 257 | if (error) { |
6102752e VK |
258 | dev_err(&pdev->dev, "request_irq failed\n"); |
259 | return error; | |
bc95df78 RK |
260 | } |
261 | ||
93366489 VKS |
262 | error = clk_prepare(kbd->clk); |
263 | if (error) | |
264 | return error; | |
265 | ||
bc95df78 RK |
266 | error = input_register_device(input_dev); |
267 | if (error) { | |
268 | dev_err(&pdev->dev, "Unable to register keyboard device\n"); | |
93366489 | 269 | clk_unprepare(kbd->clk); |
6102752e | 270 | return error; |
bc95df78 RK |
271 | } |
272 | ||
273 | device_init_wakeup(&pdev->dev, 1); | |
274 | platform_set_drvdata(pdev, kbd); | |
275 | ||
276 | return 0; | |
bc95df78 RK |
277 | } |
278 | ||
e2619cf7 | 279 | static int spear_kbd_remove(struct platform_device *pdev) |
bc95df78 | 280 | { |
93366489 VKS |
281 | struct spear_kbd *kbd = platform_get_drvdata(pdev); |
282 | ||
283 | input_unregister_device(kbd->input); | |
284 | clk_unprepare(kbd->clk); | |
285 | ||
bc95df78 RK |
286 | return 0; |
287 | } | |
288 | ||
7ffae990 | 289 | static int __maybe_unused spear_kbd_suspend(struct device *dev) |
bc95df78 RK |
290 | { |
291 | struct platform_device *pdev = to_platform_device(dev); | |
292 | struct spear_kbd *kbd = platform_get_drvdata(pdev); | |
293 | struct input_dev *input_dev = kbd->input; | |
8314f532 | 294 | unsigned int rate = 0, mode_ctl_reg, val; |
bc95df78 RK |
295 | |
296 | mutex_lock(&input_dev->mutex); | |
297 | ||
8314f532 SH |
298 | /* explicitly enable clock as we may program device */ |
299 | clk_enable(kbd->clk); | |
300 | ||
301 | mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG); | |
302 | ||
53fe6285 | 303 | if (device_may_wakeup(&pdev->dev)) { |
1eee4af3 DS |
304 | if (!enable_irq_wake(kbd->irq)) |
305 | kbd->irq_wake_enabled = true; | |
8314f532 SH |
306 | |
307 | /* | |
308 | * reprogram the keyboard operating frequency as on some | |
309 | * platform it may change during system suspended | |
310 | */ | |
311 | if (kbd->suspended_rate) | |
312 | rate = kbd->suspended_rate / 1000000 - 1; | |
313 | else | |
314 | rate = clk_get_rate(kbd->clk) / 1000000 - 1; | |
315 | ||
316 | val = mode_ctl_reg & | |
317 | ~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT); | |
318 | val |= (rate & MODE_CTL_PCLK_FREQ_MSK) | |
319 | << MODE_CTL_PCLK_FREQ_SHIFT; | |
320 | writel_relaxed(val, kbd->io_base + MODE_CTL_REG); | |
321 | ||
53fe6285 | 322 | } else { |
8314f532 SH |
323 | if (input_dev->users) { |
324 | writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN, | |
325 | kbd->io_base + MODE_CTL_REG); | |
53fe6285 | 326 | clk_disable(kbd->clk); |
8314f532 | 327 | } |
53fe6285 | 328 | } |
bc95df78 | 329 | |
8314f532 SH |
330 | /* store current configuration */ |
331 | if (input_dev->users) | |
332 | kbd->mode_ctl_reg = mode_ctl_reg; | |
333 | ||
334 | /* restore previous clk state */ | |
335 | clk_disable(kbd->clk); | |
336 | ||
bc95df78 RK |
337 | mutex_unlock(&input_dev->mutex); |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
7ffae990 | 342 | static int __maybe_unused spear_kbd_resume(struct device *dev) |
bc95df78 RK |
343 | { |
344 | struct platform_device *pdev = to_platform_device(dev); | |
345 | struct spear_kbd *kbd = platform_get_drvdata(pdev); | |
346 | struct input_dev *input_dev = kbd->input; | |
347 | ||
348 | mutex_lock(&input_dev->mutex); | |
349 | ||
53fe6285 | 350 | if (device_may_wakeup(&pdev->dev)) { |
1eee4af3 DS |
351 | if (kbd->irq_wake_enabled) { |
352 | kbd->irq_wake_enabled = false; | |
353 | disable_irq_wake(kbd->irq); | |
354 | } | |
53fe6285 SH |
355 | } else { |
356 | if (input_dev->users) | |
357 | clk_enable(kbd->clk); | |
358 | } | |
bc95df78 | 359 | |
8314f532 SH |
360 | /* restore current configuration */ |
361 | if (input_dev->users) | |
362 | writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG); | |
363 | ||
bc95df78 RK |
364 | mutex_unlock(&input_dev->mutex); |
365 | ||
366 | return 0; | |
367 | } | |
bc95df78 | 368 | |
f79e30a8 VK |
369 | static SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops, spear_kbd_suspend, spear_kbd_resume); |
370 | ||
829c4f96 VK |
371 | #ifdef CONFIG_OF |
372 | static const struct of_device_id spear_kbd_id_table[] = { | |
373 | { .compatible = "st,spear300-kbd" }, | |
374 | {} | |
375 | }; | |
376 | MODULE_DEVICE_TABLE(of, spear_kbd_id_table); | |
377 | #endif | |
378 | ||
bc95df78 RK |
379 | static struct platform_driver spear_kbd_driver = { |
380 | .probe = spear_kbd_probe, | |
1cb0aa88 | 381 | .remove = spear_kbd_remove, |
bc95df78 RK |
382 | .driver = { |
383 | .name = "keyboard", | |
bc95df78 | 384 | .pm = &spear_kbd_pm_ops, |
829c4f96 | 385 | .of_match_table = of_match_ptr(spear_kbd_id_table), |
bc95df78 RK |
386 | }, |
387 | }; | |
5146c84f | 388 | module_platform_driver(spear_kbd_driver); |
bc95df78 RK |
389 | |
390 | MODULE_AUTHOR("Rajeev Kumar"); | |
391 | MODULE_DESCRIPTION("SPEAr Keyboard Driver"); | |
392 | MODULE_LICENSE("GPL"); |