1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * drivers/hwmon/lis3lv02d_i2c.c
  4 *
  5 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
  6 * Driver is based on corresponding SPI driver written by Daniel Mack
  7 * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
  8 *
  9 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 10 *
 11 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/kernel.h>
 16#include <linux/err.h>
 17#include <linux/i2c.h>
 18#include <linux/pm_runtime.h>
 19#include <linux/delay.h>
 20#include <linux/of.h>
 21#include <linux/of_platform.h>
 22#include <linux/of_device.h>
 23
 24#include "lis3lv02d.h"
 25
 26#define DRV_NAME	"lis3lv02d_i2c"
 27
 28static const char reg_vdd[]    = "Vdd";
 29static const char reg_vdd_io[] = "Vdd_IO";
 30
 31static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
 32{
 33	int ret;
 34	if (state == LIS3_REG_OFF) {
 35		ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
 36					lis3->regulators);
 37	} else {
 38		ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
 39					lis3->regulators);
 40		/* Chip needs time to wakeup. Not mentioned in datasheet */
 41		usleep_range(10000, 20000);
 42	}
 43	return ret;
 44}
 45
 46static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
 47{
 48	struct i2c_client *c = lis3->bus_priv;
 49	return i2c_smbus_write_byte_data(c, reg, value);
 50}
 51
 52static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
 53{
 54	struct i2c_client *c = lis3->bus_priv;
 55	*v = i2c_smbus_read_byte_data(c, reg);
 56	return 0;
 57}
 58
 59static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
 60				u8 *v)
 61{
 62	struct i2c_client *c = lis3->bus_priv;
 63	reg |= (1 << 7); /* 7th bit enables address auto incrementation */
 64	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
 65}
 66
 67static int lis3_i2c_init(struct lis3lv02d *lis3)
 68{
 69	u8 reg;
 70	int ret;
 71
 72	lis3_reg_ctrl(lis3, LIS3_REG_ON);
 73
 74	lis3->read(lis3, WHO_AM_I, &reg);
 75	if (reg != lis3->whoami)
 76		printk(KERN_ERR "lis3: power on failure\n");
 77
 78	/* power up the device */
 79	ret = lis3->read(lis3, CTRL_REG1, &reg);
 80	if (ret < 0)
 81		return ret;
 82
 83	if (lis3->whoami == WAI_3DLH)
 84		reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 85	else
 86		reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 87
 88	return lis3->write(lis3, CTRL_REG1, reg);
 89}
 90
 91/* Default axis mapping but it can be overwritten by platform data */
 92static union axis_conversion lis3lv02d_axis_map =
 93	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
 94
 95#ifdef CONFIG_OF
 96static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
 97	{ .compatible = "st,lis3lv02d" },
 98	{}
 99};
100MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
101#endif
102
103static int lis3lv02d_i2c_probe(struct i2c_client *client)
 
104{
105	int ret = 0;
106	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
107
108#ifdef CONFIG_OF
109	if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
110		lis3_dev.of_node = client->dev.of_node;
111		ret = lis3lv02d_init_dt(&lis3_dev);
112		if (ret)
113			return ret;
114		pdata = lis3_dev.pdata;
115	}
116#endif
117
118	if (pdata) {
119		if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
120			(i2c_check_functionality(client->adapter,
121						I2C_FUNC_SMBUS_I2C_BLOCK)))
122			lis3_dev.blkread  = lis3_i2c_blockread;
123
124		if (pdata->axis_x)
125			lis3lv02d_axis_map.x = pdata->axis_x;
126
127		if (pdata->axis_y)
128			lis3lv02d_axis_map.y = pdata->axis_y;
129
130		if (pdata->axis_z)
131			lis3lv02d_axis_map.z = pdata->axis_z;
132
133		if (pdata->setup_resources)
134			ret = pdata->setup_resources();
135
136		if (ret)
137			goto fail;
138	}
139
140	lis3_dev.regulators[0].supply = reg_vdd;
141	lis3_dev.regulators[1].supply = reg_vdd_io;
142	ret = regulator_bulk_get(&client->dev,
143				 ARRAY_SIZE(lis3_dev.regulators),
144				 lis3_dev.regulators);
145	if (ret < 0)
146		goto fail;
147
148	lis3_dev.pdata	  = pdata;
149	lis3_dev.bus_priv = client;
150	lis3_dev.init	  = lis3_i2c_init;
151	lis3_dev.read	  = lis3_i2c_read;
152	lis3_dev.write	  = lis3_i2c_write;
153	lis3_dev.reg_ctrl = lis3_reg_ctrl;
154	lis3_dev.irq	  = client->irq;
155	lis3_dev.ac	  = lis3lv02d_axis_map;
156	lis3_dev.pm_dev	  = &client->dev;
157
158	i2c_set_clientdata(client, &lis3_dev);
159
160	/* Provide power over the init call */
161	lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
162
163	ret = lis3lv02d_init_device(&lis3_dev);
164
165	lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
166
167	if (ret)
168		goto fail2;
169	return 0;
170
171fail2:
172	regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
173				lis3_dev.regulators);
174fail:
175	if (pdata && pdata->release_resources)
176		pdata->release_resources();
177	return ret;
178}
179
180static void lis3lv02d_i2c_remove(struct i2c_client *client)
181{
182	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
183	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
184
185	if (pdata && pdata->release_resources)
186		pdata->release_resources();
187
188	lis3lv02d_joystick_disable(lis3);
189	lis3lv02d_remove_fs(&lis3_dev);
190
191	regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
192			    lis3_dev.regulators);
 
193}
194
195#ifdef CONFIG_PM_SLEEP
196static int lis3lv02d_i2c_suspend(struct device *dev)
197{
198	struct i2c_client *client = to_i2c_client(dev);
199	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
200
201	/* Turn on for wakeup if turned off by runtime suspend */
202	if (lis3->pdata && lis3->pdata->wakeup_flags) {
203		if (pm_runtime_suspended(dev))
204			lis3lv02d_poweron(lis3);
205	/* For non wakeup turn off if not already turned off by runtime suspend */
206	} else if (!pm_runtime_suspended(dev))
207		lis3lv02d_poweroff(lis3);
208
209	return 0;
210}
211
212static int lis3lv02d_i2c_resume(struct device *dev)
213{
214	struct i2c_client *client = to_i2c_client(dev);
215	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
216
217	/* Turn back off if turned on for wakeup and runtime suspended*/
218	if (lis3->pdata && lis3->pdata->wakeup_flags) {
219		if (pm_runtime_suspended(dev))
220			lis3lv02d_poweroff(lis3);
221	/* For non wakeup turn back on if not runtime suspended */
222	} else if (!pm_runtime_suspended(dev))
 
223		lis3lv02d_poweron(lis3);
224
225	return 0;
226}
227#endif /* CONFIG_PM_SLEEP */
228
229#ifdef CONFIG_PM
230static int lis3_i2c_runtime_suspend(struct device *dev)
231{
232	struct i2c_client *client = to_i2c_client(dev);
233	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
234
235	lis3lv02d_poweroff(lis3);
236	return 0;
237}
238
239static int lis3_i2c_runtime_resume(struct device *dev)
240{
241	struct i2c_client *client = to_i2c_client(dev);
242	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
243
244	lis3lv02d_poweron(lis3);
245	return 0;
246}
247#endif /* CONFIG_PM */
248
249static const struct i2c_device_id lis3lv02d_id[] = {
250	{"lis3lv02d", LIS3LV02D},
251	{"lis331dlh", LIS331DLH},
252	{}
253};
254
255MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
256
257static const struct dev_pm_ops lis3_pm_ops = {
258	SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
259				lis3lv02d_i2c_resume)
260	SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
261			   lis3_i2c_runtime_resume,
262			   NULL)
263};
264
265static struct i2c_driver lis3lv02d_i2c_driver = {
266	.driver	 = {
267		.name   = DRV_NAME,
268		.pm     = &lis3_pm_ops,
269		.of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
270	},
271	.probe = lis3lv02d_i2c_probe,
272	.remove	= lis3lv02d_i2c_remove,
273	.id_table = lis3lv02d_id,
274};
275
276module_i2c_driver(lis3lv02d_i2c_driver);
277
278MODULE_AUTHOR("Nokia Corporation");
279MODULE_DESCRIPTION("lis3lv02d I2C interface");
280MODULE_LICENSE("GPL");

 
  1/*
  2 * drivers/hwmon/lis3lv02d_i2c.c
  3 *
  4 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
  5 * Driver is based on corresponding SPI driver written by Daniel Mack
  6 * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
  7 *
  8 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
  9 *
 10 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
 11 *
 12 * This program is free software; you can redistribute it and/or
 13 * modify it under the terms of the GNU General Public License
 14 * version 2 as published by the Free Software Foundation.
 15 *
 16 * This program is distributed in the hope that it will be useful, but
 17 * WITHOUT ANY WARRANTY; without even the implied warranty of
 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 19 * General Public License for more details.
 20 *
 21 * You should have received a copy of the GNU General Public License
 22 * along with this program; if not, write to the Free Software
 23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 24 * 02110-1301 USA
 25 */
 26
 27#include <linux/module.h>
 28#include <linux/kernel.h>
 29#include <linux/err.h>
 30#include <linux/i2c.h>
 31#include <linux/pm_runtime.h>
 32#include <linux/delay.h>
 33#include <linux/of.h>
 34#include <linux/of_platform.h>
 35#include <linux/of_device.h>
 36
 37#include "lis3lv02d.h"
 38
 39#define DRV_NAME	"lis3lv02d_i2c"
 40
 41static const char reg_vdd[]    = "Vdd";
 42static const char reg_vdd_io[] = "Vdd_IO";
 43
 44static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
 45{
 46	int ret;
 47	if (state == LIS3_REG_OFF) {
 48		ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
 49					lis3->regulators);
 50	} else {
 51		ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
 52					lis3->regulators);
 53		/* Chip needs time to wakeup. Not mentioned in datasheet */
 54		usleep_range(10000, 20000);
 55	}
 56	return ret;
 57}
 58
 59static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
 60{
 61	struct i2c_client *c = lis3->bus_priv;
 62	return i2c_smbus_write_byte_data(c, reg, value);
 63}
 64
 65static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
 66{
 67	struct i2c_client *c = lis3->bus_priv;
 68	*v = i2c_smbus_read_byte_data(c, reg);
 69	return 0;
 70}
 71
 72static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
 73				u8 *v)
 74{
 75	struct i2c_client *c = lis3->bus_priv;
 76	reg |= (1 << 7); /* 7th bit enables address auto incrementation */
 77	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
 78}
 79
 80static int lis3_i2c_init(struct lis3lv02d *lis3)
 81{
 82	u8 reg;
 83	int ret;
 84
 85	lis3_reg_ctrl(lis3, LIS3_REG_ON);
 86
 87	lis3->read(lis3, WHO_AM_I, &reg);
 88	if (reg != lis3->whoami)
 89		printk(KERN_ERR "lis3: power on failure\n");
 90
 91	/* power up the device */
 92	ret = lis3->read(lis3, CTRL_REG1, &reg);
 93	if (ret < 0)
 94		return ret;
 95
 96	if (lis3->whoami == WAI_3DLH)
 97		reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 98	else
 99		reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
100
101	return lis3->write(lis3, CTRL_REG1, reg);
102}
103
104/* Default axis mapping but it can be overwritten by platform data */
105static union axis_conversion lis3lv02d_axis_map =
106	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
107
108#ifdef CONFIG_OF
109static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
110	{ .compatible = "st,lis3lv02d" },
111	{}
112};
113MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
114#endif
115
116static int lis3lv02d_i2c_probe(struct i2c_client *client,
117					const struct i2c_device_id *id)
118{
119	int ret = 0;
120	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
121
122#ifdef CONFIG_OF
123	if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
124		lis3_dev.of_node = client->dev.of_node;
125		ret = lis3lv02d_init_dt(&lis3_dev);
126		if (ret)
127			return ret;
128		pdata = lis3_dev.pdata;
129	}
130#endif
131
132	if (pdata) {
133		if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
134			(i2c_check_functionality(client->adapter,
135						I2C_FUNC_SMBUS_I2C_BLOCK)))
136			lis3_dev.blkread  = lis3_i2c_blockread;
137
138		if (pdata->axis_x)
139			lis3lv02d_axis_map.x = pdata->axis_x;
140
141		if (pdata->axis_y)
142			lis3lv02d_axis_map.y = pdata->axis_y;
143
144		if (pdata->axis_z)
145			lis3lv02d_axis_map.z = pdata->axis_z;
146
147		if (pdata->setup_resources)
148			ret = pdata->setup_resources();
149
150		if (ret)
151			goto fail;
152	}
153
154	lis3_dev.regulators[0].supply = reg_vdd;
155	lis3_dev.regulators[1].supply = reg_vdd_io;
156	ret = regulator_bulk_get(&client->dev,
157				 ARRAY_SIZE(lis3_dev.regulators),
158				 lis3_dev.regulators);
159	if (ret < 0)
160		goto fail;
161
162	lis3_dev.pdata	  = pdata;
163	lis3_dev.bus_priv = client;
164	lis3_dev.init	  = lis3_i2c_init;
165	lis3_dev.read	  = lis3_i2c_read;
166	lis3_dev.write	  = lis3_i2c_write;
 
167	lis3_dev.irq	  = client->irq;
168	lis3_dev.ac	  = lis3lv02d_axis_map;
169	lis3_dev.pm_dev	  = &client->dev;
170
171	i2c_set_clientdata(client, &lis3_dev);
172
173	/* Provide power over the init call */
174	lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
175
176	ret = lis3lv02d_init_device(&lis3_dev);
177
178	lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
179
180	if (ret)
181		goto fail2;
182	return 0;
183
184fail2:
185	regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
186				lis3_dev.regulators);
187fail:
188	if (pdata && pdata->release_resources)
189		pdata->release_resources();
190	return ret;
191}
192
193static int lis3lv02d_i2c_remove(struct i2c_client *client)
194{
195	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
196	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
197
198	if (pdata && pdata->release_resources)
199		pdata->release_resources();
200
201	lis3lv02d_joystick_disable(lis3);
202	lis3lv02d_remove_fs(&lis3_dev);
203
204	regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
205			    lis3_dev.regulators);
206	return 0;
207}
208
209#ifdef CONFIG_PM_SLEEP
210static int lis3lv02d_i2c_suspend(struct device *dev)
211{
212	struct i2c_client *client = to_i2c_client(dev);
213	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
214
215	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 
 
 
 
 
216		lis3lv02d_poweroff(lis3);
 
217	return 0;
218}
219
220static int lis3lv02d_i2c_resume(struct device *dev)
221{
222	struct i2c_client *client = to_i2c_client(dev);
223	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
224
225	/*
226	 * pm_runtime documentation says that devices should always
227	 * be powered on at resume. Pm_runtime turns them off after system
228	 * wide resume is complete.
229	 */
230	if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
231		pm_runtime_suspended(dev))
232		lis3lv02d_poweron(lis3);
233
234	return 0;
235}
236#endif /* CONFIG_PM_SLEEP */
237
238#ifdef CONFIG_PM
239static int lis3_i2c_runtime_suspend(struct device *dev)
240{
241	struct i2c_client *client = to_i2c_client(dev);
242	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
243
244	lis3lv02d_poweroff(lis3);
245	return 0;
246}
247
248static int lis3_i2c_runtime_resume(struct device *dev)
249{
250	struct i2c_client *client = to_i2c_client(dev);
251	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
252
253	lis3lv02d_poweron(lis3);
254	return 0;
255}
256#endif /* CONFIG_PM */
257
258static const struct i2c_device_id lis3lv02d_id[] = {
259	{"lis3lv02d", LIS3LV02D},
260	{"lis331dlh", LIS331DLH},
261	{}
262};
263
264MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
265
266static const struct dev_pm_ops lis3_pm_ops = {
267	SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
268				lis3lv02d_i2c_resume)
269	SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
270			   lis3_i2c_runtime_resume,
271			   NULL)
272};
273
274static struct i2c_driver lis3lv02d_i2c_driver = {
275	.driver	 = {
276		.name   = DRV_NAME,
277		.pm     = &lis3_pm_ops,
278		.of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
279	},
280	.probe	= lis3lv02d_i2c_probe,
281	.remove	= lis3lv02d_i2c_remove,
282	.id_table = lis3lv02d_id,
283};
284
285module_i2c_driver(lis3lv02d_i2c_driver);
286
287MODULE_AUTHOR("Nokia Corporation");
288MODULE_DESCRIPTION("lis3lv02d I2C interface");
289MODULE_LICENSE("GPL");