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20#include <linux/types.h>
21#include <linux/interrupt.h>
22#include <linux/delay.h>
23#include <linux/slab.h>
24#include <linux/input.h>
25#include <linux/input/cma3000.h>
26
27#include "cma3000_d0x.h"
28
29#define CMA3000_WHOAMI 0x00
30#define CMA3000_REVID 0x01
31#define CMA3000_CTRL 0x02
32#define CMA3000_STATUS 0x03
33#define CMA3000_RSTR 0x04
34#define CMA3000_INTSTATUS 0x05
35#define CMA3000_DOUTX 0x06
36#define CMA3000_DOUTY 0x07
37#define CMA3000_DOUTZ 0x08
38#define CMA3000_MDTHR 0x09
39#define CMA3000_MDFFTMR 0x0A
40#define CMA3000_FFTHR 0x0B
41
42#define CMA3000_RANGE2G (1 << 7)
43#define CMA3000_RANGE8G (0 << 7)
44#define CMA3000_BUSI2C (0 << 4)
45#define CMA3000_MODEMASK (7 << 1)
46#define CMA3000_GRANGEMASK (1 << 7)
47
48#define CMA3000_STATUS_PERR 1
49#define CMA3000_INTSTATUS_FFDET (1 << 2)
50
51
52#define CMA3000_SETDELAY 30
53
54
55#define CMA3000_INTDELAY 44
56
57
58
59
60
61
62#define BIT_TO_2G 18
63#define BIT_TO_8G 71
64
65struct cma3000_accl_data {
66 const struct cma3000_bus_ops *bus_ops;
67 const struct cma3000_platform_data *pdata;
68
69 struct device *dev;
70 struct input_dev *input_dev;
71
72 int bit_to_mg;
73 int irq;
74
75 int g_range;
76 u8 mode;
77
78 struct mutex mutex;
79 bool opened;
80 bool suspended;
81};
82
83#define CMA3000_READ(data, reg, msg) \
84 (data->bus_ops->read(data->dev, reg, msg))
85#define CMA3000_SET(data, reg, val, msg) \
86 ((data)->bus_ops->write(data->dev, reg, val, msg))
87
88
89
90
91
92
93
94static int mode_to_mg[8][2] = {
95 { 0, 0 },
96 { BIT_TO_8G, BIT_TO_2G },
97 { BIT_TO_8G, BIT_TO_2G },
98 { BIT_TO_8G, BIT_TO_8G },
99 { BIT_TO_8G, BIT_TO_8G },
100 { BIT_TO_8G, BIT_TO_2G },
101 { BIT_TO_8G, BIT_TO_2G },
102 { 0, 0},
103};
104
105static void decode_mg(struct cma3000_accl_data *data, int *datax,
106 int *datay, int *dataz)
107{
108
109 *datax = ((s8)*datax) * data->bit_to_mg;
110 *datay = ((s8)*datay) * data->bit_to_mg;
111 *dataz = ((s8)*dataz) * data->bit_to_mg;
112}
113
114static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
115{
116 struct cma3000_accl_data *data = dev_id;
117 int datax, datay, dataz;
118 u8 ctrl, mode, range, intr_status;
119
120 intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
121 if (intr_status < 0)
122 return IRQ_NONE;
123
124
125 if (intr_status & CMA3000_INTSTATUS_FFDET) {
126 input_report_abs(data->input_dev, ABS_MISC, 1);
127 input_sync(data->input_dev);
128 } else {
129 input_report_abs(data->input_dev, ABS_MISC, 0);
130 }
131
132 datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
133 datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
134 dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");
135
136 ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
137 mode = (ctrl & CMA3000_MODEMASK) >> 1;
138 range = (ctrl & CMA3000_GRANGEMASK) >> 7;
139
140 data->bit_to_mg = mode_to_mg[mode][range];
141
142
143 if (data->bit_to_mg == 0)
144 return IRQ_NONE;
145
146
147 decode_mg(data, &datax, &datay, &dataz);
148
149 input_report_abs(data->input_dev, ABS_X, datax);
150 input_report_abs(data->input_dev, ABS_Y, datay);
151 input_report_abs(data->input_dev, ABS_Z, dataz);
152 input_sync(data->input_dev);
153
154 return IRQ_HANDLED;
155}
156
157static int cma3000_reset(struct cma3000_accl_data *data)
158{
159 int val;
160
161
162 CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
163 CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
164 CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");
165
166
167 mdelay(10);
168
169 val = CMA3000_READ(data, CMA3000_STATUS, "Status");
170 if (val < 0) {
171 dev_err(data->dev, "Reset failed\n");
172 return val;
173 }
174
175 if (val & CMA3000_STATUS_PERR) {
176 dev_err(data->dev, "Parity Error\n");
177 return -EIO;
178 }
179
180 return 0;
181}
182
183static int cma3000_poweron(struct cma3000_accl_data *data)
184{
185 const struct cma3000_platform_data *pdata = data->pdata;
186 u8 ctrl = 0;
187 int ret;
188
189 if (data->g_range == CMARANGE_2G) {
190 ctrl = (data->mode << 1) | CMA3000_RANGE2G;
191 } else if (data->g_range == CMARANGE_8G) {
192 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
193 } else {
194 dev_info(data->dev,
195 "Invalid G range specified, assuming 8G\n");
196 ctrl = (data->mode << 1) | CMA3000_RANGE8G;
197 }
198
199 ctrl |= data->bus_ops->ctrl_mod;
200
201 CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
202 "Motion Detect Threshold");
203 CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
204 "Time register");
205 CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
206 "Free fall threshold");
207 ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
208 if (ret < 0)
209 return -EIO;
210
211 msleep(CMA3000_SETDELAY);
212
213 return 0;
214}
215
216static int cma3000_poweroff(struct cma3000_accl_data *data)
217{
218 int ret;
219
220 ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
221 msleep(CMA3000_SETDELAY);
222
223 return ret;
224}
225
226static int cma3000_open(struct input_dev *input_dev)
227{
228 struct cma3000_accl_data *data = input_get_drvdata(input_dev);
229
230 mutex_lock(&data->mutex);
231
232 if (!data->suspended)
233 cma3000_poweron(data);
234
235 data->opened = true;
236
237 mutex_unlock(&data->mutex);
238
239 return 0;
240}
241
242static void cma3000_close(struct input_dev *input_dev)
243{
244 struct cma3000_accl_data *data = input_get_drvdata(input_dev);
245
246 mutex_lock(&data->mutex);
247
248 if (!data->suspended)
249 cma3000_poweroff(data);
250
251 data->opened = false;
252
253 mutex_unlock(&data->mutex);
254}
255
256void cma3000_suspend(struct cma3000_accl_data *data)
257{
258 mutex_lock(&data->mutex);
259
260 if (!data->suspended && data->opened)
261 cma3000_poweroff(data);
262
263 data->suspended = true;
264
265 mutex_unlock(&data->mutex);
266}
267EXPORT_SYMBOL(cma3000_suspend);
268
269
270void cma3000_resume(struct cma3000_accl_data *data)
271{
272 mutex_lock(&data->mutex);
273
274 if (data->suspended && data->opened)
275 cma3000_poweron(data);
276
277 data->suspended = false;
278
279 mutex_unlock(&data->mutex);
280}
281EXPORT_SYMBOL(cma3000_resume);
282
283struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
284 const struct cma3000_bus_ops *bops)
285{
286 const struct cma3000_platform_data *pdata = dev->platform_data;
287 struct cma3000_accl_data *data;
288 struct input_dev *input_dev;
289 int rev;
290 int error;
291
292 if (!pdata) {
293 dev_err(dev, "platform data not found\n");
294 error = -EINVAL;
295 goto err_out;
296 }
297
298
299
300 if (irq == 0) {
301 error = -EINVAL;
302 goto err_out;
303 }
304
305 data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL);
306 input_dev = input_allocate_device();
307 if (!data || !input_dev) {
308 error = -ENOMEM;
309 goto err_free_mem;
310 }
311
312 data->dev = dev;
313 data->input_dev = input_dev;
314 data->bus_ops = bops;
315 data->pdata = pdata;
316 data->irq = irq;
317 mutex_init(&data->mutex);
318
319 data->mode = pdata->mode;
320 if (data->mode < CMAMODE_DEFAULT || data->mode > CMAMODE_POFF) {
321 data->mode = CMAMODE_MOTDET;
322 dev_warn(dev,
323 "Invalid mode specified, assuming Motion Detect\n");
324 }
325
326 data->g_range = pdata->g_range;
327 if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
328 dev_info(dev,
329 "Invalid G range specified, assuming 8G\n");
330 data->g_range = CMARANGE_8G;
331 }
332
333 input_dev->name = "cma3000-accelerometer";
334 input_dev->id.bustype = bops->bustype;
335 input_dev->open = cma3000_open;
336 input_dev->close = cma3000_close;
337
338 __set_bit(EV_ABS, input_dev->evbit);
339
340 input_set_abs_params(input_dev, ABS_X,
341 -data->g_range, data->g_range, pdata->fuzz_x, 0);
342 input_set_abs_params(input_dev, ABS_Y,
343 -data->g_range, data->g_range, pdata->fuzz_y, 0);
344 input_set_abs_params(input_dev, ABS_Z,
345 -data->g_range, data->g_range, pdata->fuzz_z, 0);
346 input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0);
347
348 input_set_drvdata(input_dev, data);
349
350 error = cma3000_reset(data);
351 if (error)
352 goto err_free_mem;
353
354 rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
355 if (rev < 0) {
356 error = rev;
357 goto err_free_mem;
358 }
359
360 pr_info("CMA3000 Accelerometer: Revision %x\n", rev);
361
362 error = request_threaded_irq(irq, NULL, cma3000_thread_irq,
363 pdata->irqflags | IRQF_ONESHOT,
364 "cma3000_d0x", data);
365 if (error) {
366 dev_err(dev, "request_threaded_irq failed\n");
367 goto err_free_mem;
368 }
369
370 error = input_register_device(data->input_dev);
371 if (error) {
372 dev_err(dev, "Unable to register input device\n");
373 goto err_free_irq;
374 }
375
376 return data;
377
378err_free_irq:
379 free_irq(irq, data);
380err_free_mem:
381 input_free_device(input_dev);
382 kfree(data);
383err_out:
384 return ERR_PTR(error);
385}
386EXPORT_SYMBOL(cma3000_init);
387
388void cma3000_exit(struct cma3000_accl_data *data)
389{
390 free_irq(data->irq, data);
391 input_unregister_device(data->input_dev);
392 kfree(data);
393}
394EXPORT_SYMBOL(cma3000_exit);
395
396MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
397MODULE_LICENSE("GPL");
398MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");
399
