/arch/arm/mach-msm/board-mahimahi-tpa2018d1.c

  1/* drivers/i2c/chips/tpa2018d1.c
  2 *
  3 * TI TPA2018D1 Speaker Amplifier
  4 *
  5 * Copyright (C) 2009 HTC Corporation
  6 *
  7 * This software is licensed under the terms of the GNU General Public
  8 * License version 2, as published by the Free Software Foundation, and
  9 * may be copied, distributed, and modified under those terms.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 */
 17
 18/* TODO: content validation in TPA2018_SET_CONFIG */
 19
 20#include <linux/module.h>
 21#include <linux/init.h>
 22#include <linux/device.h>
 23#include <linux/fs.h>
 24#include <linux/i2c.h>
 25#include <linux/miscdevice.h>
 26#include <linux/gpio.h>
 27#include <asm/uaccess.h>
 28#include <linux/delay.h>
 29#include <linux/mutex.h>
 30#include <linux/slab.h>
 31#include <linux/tpa2018d1.h>
 32
 33#include "board-mahimahi-tpa2018d1.h"
 34
 35static struct i2c_client *this_client;
 36static struct tpa2018d1_platform_data *pdata;
 37static int is_on;
 38static char spk_amp_cfg[8];
 39static const char spk_amp_on[8] = { /* same length as spk_amp_cfg */
 40	0x01, 0xc3, 0x20, 0x01, 0x00, 0x08, 0x1a, 0x21
 41};
 42static const char spk_amp_off[] = {0x01, 0xa2};
 43
 44static DEFINE_MUTEX(spk_amp_lock);
 45static int tpa2018d1_opened;
 46static char *config_data;
 47static int tpa2018d1_num_modes;
 48
 49#define DEBUG 0
 50
 51static int tpa2018_i2c_write(const char *txData, int length)
 52{
 53	struct i2c_msg msg[] = {
 54		{
 55			.addr = this_client->addr,
 56			.flags = 0,
 57			.len = length,
 58			.buf = txData,
 59		},
 60	};
 61
 62	if (i2c_transfer(this_client->adapter, msg, 1) < 0) {
 63		pr_err("%s: I2C transfer error\n", __func__);
 64		return -EIO;
 65	} else
 66		return 0;
 67}
 68
 69static int tpa2018_i2c_read(char *rxData, int length)
 70{
 71	struct i2c_msg msgs[] = {
 72		{
 73			.addr = this_client->addr,
 74			.flags = I2C_M_RD,
 75			.len = length,
 76			.buf = rxData,
 77		},
 78	};
 79
 80	if (i2c_transfer(this_client->adapter, msgs, 1) < 0) {
 81		pr_err("%s: I2C transfer error\n", __func__);
 82		return -EIO;
 83	}
 84
 85#if DEBUG
 86	do {
 87		int i = 0;
 88		for (i = 0; i < length; i++)
 89			pr_info("%s: rx[%d] = %2x\n",
 90				__func__, i, rxData[i]);
 91	} while(0);
 92#endif
 93
 94	return 0;
 95}
 96
 97static int tpa2018d1_open(struct inode *inode, struct file *file)
 98{
 99	int rc = 0;
100
101	mutex_lock(&spk_amp_lock);
102
103	if (tpa2018d1_opened) {
104		pr_err("%s: busy\n", __func__);
105		rc = -EBUSY;
106		goto done;
107	}
108
109	tpa2018d1_opened = 1;
110done:
111	mutex_unlock(&spk_amp_lock);
112	return rc;
113}
114
115static int tpa2018d1_release(struct inode *inode, struct file *file)
116{
117	mutex_lock(&spk_amp_lock);
118	tpa2018d1_opened = 0;
119	mutex_unlock(&spk_amp_lock);
120
121	return 0;
122}
123
124static int tpa2018d1_read_config(void __user *argp)
125{
126	int rc = 0;
127	unsigned char reg_idx = 0x01;
128	unsigned char tmp[7];
129
130	if (!is_on) {
131		gpio_set_value(pdata->gpio_tpa2018_spk_en, 1);
132		msleep(5); /* According to TPA2018D1 Spec */
133	}
134
135	rc = tpa2018_i2c_write(&reg_idx, sizeof(reg_idx));
136	if (rc < 0)
137		goto err;
138
139	rc = tpa2018_i2c_read(tmp, sizeof(tmp));
140	if (rc < 0)
141		goto err;
142
143	if (copy_to_user(argp, &tmp, sizeof(tmp)))
144		rc = -EFAULT;
145
146err:
147	if (!is_on)
148		gpio_set_value(pdata->gpio_tpa2018_spk_en, 0);
149	return rc;
150}
151
152static int tpa2018d1_ioctl(struct inode *inode, struct file *file,
153		unsigned int cmd, unsigned long arg)
154{
155	void __user *argp = (void __user *)arg;
156	int rc = 0;
157	int mode = -1;
158	int offset = 0;
159	struct tpa2018d1_config_data cfg;
160
161	mutex_lock(&spk_amp_lock);
162
163	switch (cmd) {
164	case TPA2018_SET_CONFIG:
165		if (copy_from_user(spk_amp_cfg, argp, sizeof(spk_amp_cfg)))
166			rc = -EFAULT;
167		break;
168
169	case TPA2018_READ_CONFIG:
170		rc = tpa2018d1_read_config(argp);
171		break;
172
173	case TPA2018_SET_MODE:
174		if (copy_from_user(&mode, argp, sizeof(mode))) {
175			rc = -EFAULT;
176			break;
177		}
178		if (mode >= tpa2018d1_num_modes || mode < 0) {
179			pr_err("%s: unsupported tpa2018d1 mode %d\n",
180				__func__, mode);
181			rc = -EINVAL;
182			break;
183		}
184		if (!config_data) {
185			pr_err("%s: no config data!\n", __func__);
186			rc = -EIO;
187			break;
188		}
189		memcpy(spk_amp_cfg, config_data + mode * TPA2018D1_CMD_LEN,
190			TPA2018D1_CMD_LEN);
191		break;
192
193	case TPA2018_SET_PARAM:
194		if (copy_from_user(&cfg, argp, sizeof(cfg))) {
195			pr_err("%s: copy from user failed.\n", __func__);
196			rc = -EFAULT;
197			break;
198		}
199		tpa2018d1_num_modes = cfg.mode_num;
200		if (tpa2018d1_num_modes > TPA2018_NUM_MODES) {
201			pr_err("%s: invalid number of modes %d\n", __func__,
202				tpa2018d1_num_modes);
203			rc = -EINVAL;
204			break;
205		}
206		if (cfg.data_len != tpa2018d1_num_modes*TPA2018D1_CMD_LEN) {
207			pr_err("%s: invalid data length %d, expecting %d\n",
208				__func__, cfg.data_len,
209				tpa2018d1_num_modes * TPA2018D1_CMD_LEN);
210			rc = -EINVAL;
211			break;
212		}
213		/* Free the old data */
214		if (config_data)
215			kfree(config_data);
216		config_data = kmalloc(cfg.data_len, GFP_KERNEL);
217		if (!config_data) {
218			pr_err("%s: out of memory\n", __func__);
219			rc = -ENOMEM;
220			break;
221		}
222		if (copy_from_user(config_data, cfg.cmd_data, cfg.data_len)) {
223			pr_err("%s: copy data from user failed.\n", __func__);
224			kfree(config_data);
225			config_data = NULL;
226			rc = -EFAULT;
227			break;
228		}
229		/* replace default setting with playback setting */
230		if (tpa2018d1_num_modes >= TPA2018_MODE_PLAYBACK) {
231			offset = TPA2018_MODE_PLAYBACK * TPA2018D1_CMD_LEN;
232			memcpy(spk_amp_cfg, config_data + offset,
233					TPA2018D1_CMD_LEN);
234		}
235		break;
236
237	default:
238		pr_err("%s: invalid command %d\n", __func__, _IOC_NR(cmd));
239		rc = -EINVAL;
240		break;
241	}
242	mutex_unlock(&spk_amp_lock);
243	return rc;
244}
245
246static struct file_operations tpa2018d1_fops = {
247	.owner = THIS_MODULE,
248	.open = tpa2018d1_open,
249	.release = tpa2018d1_release,
250	.ioctl = tpa2018d1_ioctl,
251};
252
253static struct miscdevice tpa2018d1_device = {
254	.minor = MISC_DYNAMIC_MINOR,
255	.name = "tpa2018d1",
256	.fops = &tpa2018d1_fops,
257};
258
259void tpa2018d1_set_speaker_amp(int on)
260{
261	if (!pdata) {
262		pr_err("%s: no platform data!\n", __func__);
263		return;
264	}
265	mutex_lock(&spk_amp_lock);
266	if (on && !is_on) {
267		gpio_set_value(pdata->gpio_tpa2018_spk_en, 1);
268		msleep(5); /* According to TPA2018D1 Spec */
269
270		if (tpa2018_i2c_write(spk_amp_cfg, sizeof(spk_amp_cfg)) == 0) {
271			is_on = 1;
272			pr_info("%s: ON\n", __func__);
273		}
274	} else if (!on && is_on) {
275		if (tpa2018_i2c_write(spk_amp_off, sizeof(spk_amp_off)) == 0) {
276			is_on = 0;
277			msleep(2);
278			gpio_set_value(pdata->gpio_tpa2018_spk_en, 0);
279			pr_info("%s: OFF\n", __func__);
280		}
281	}
282	mutex_unlock(&spk_amp_lock);
283}
284
285static int tpa2018d1_probe(struct i2c_client *client, const struct i2c_device_id *id)
286{
287	int ret = 0;
288
289	pdata = client->dev.platform_data;
290
291	if (!pdata) {
292		ret = -EINVAL;
293		pr_err("%s: platform data is NULL\n", __func__);
294		goto err_no_pdata;
295	}
296
297	this_client = client;
298
299	ret = gpio_request(pdata->gpio_tpa2018_spk_en, "tpa2018");
300	if (ret < 0) {
301		pr_err("%s: gpio request aud_spk_en pin failed\n", __func__);
302		goto err_free_gpio;
303	}
304
305	ret = gpio_direction_output(pdata->gpio_tpa2018_spk_en, 1);
306	if (ret < 0) {
307		pr_err("%s: request aud_spk_en gpio direction failed\n",
308			__func__);
309		goto err_free_gpio;
310	}
311
312	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
313		pr_err("%s: i2c check functionality error\n", __func__);
314		ret = -ENODEV;
315		goto err_free_gpio;
316	}
317
318	gpio_set_value(pdata->gpio_tpa2018_spk_en, 0); /* Default Low */
319
320	ret = misc_register(&tpa2018d1_device);
321	if (ret) {
322		pr_err("%s: tpa2018d1_device register failed\n", __func__);
323		goto err_free_gpio;
324	}
325	memcpy(spk_amp_cfg, spk_amp_on, sizeof(spk_amp_on));
326	return 0;
327
328err_free_gpio:
329	gpio_free(pdata->gpio_tpa2018_spk_en);
330err_no_pdata:
331	return ret;
332}
333
334static int tpa2018d1_suspend(struct i2c_client *client, pm_message_t mesg)
335{
336	return 0;
337}
338
339static int tpa2018d1_resume(struct i2c_client *client)
340{
341	return 0;
342}
343
344static const struct i2c_device_id tpa2018d1_id[] = {
345	{ TPA2018D1_I2C_NAME, 0 },
346	{ }
347};
348
349static struct i2c_driver tpa2018d1_driver = {
350	.probe = tpa2018d1_probe,
351	.suspend = tpa2018d1_suspend,
352	.resume = tpa2018d1_resume,
353	.id_table = tpa2018d1_id,
354	.driver = {
355		.name = TPA2018D1_I2C_NAME,
356	},
357};
358
359static int __init tpa2018d1_init(void)
360{
361	pr_info("%s\n", __func__);
362	return i2c_add_driver(&tpa2018d1_driver);
363}
364
365module_init(tpa2018d1_init);
366
367MODULE_DESCRIPTION("tpa2018d1 speaker amp driver");
368MODULE_LICENSE("GPL");