Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for TWL4030/6030 Generic Pulse Width Modulator
4 *
5 * Copyright (C) 2012 Texas Instruments
6 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
7 */
8
9#include <linux/module.h>
10#include <linux/of.h>
11#include <linux/platform_device.h>
12#include <linux/pwm.h>
13#include <linux/mfd/twl.h>
14#include <linux/slab.h>
15
16/*
17 * This driver handles the PWMs of TWL4030 and TWL6030.
18 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
19 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
20 */
21
22#define TWL_PWM_MAX 0x7f
23
24/* Registers, bits and macro for TWL4030 */
25#define TWL4030_GPBR1_REG 0x0c
26#define TWL4030_PMBR1_REG 0x0d
27
28/* GPBR1 register bits */
29#define TWL4030_PWMXCLK_ENABLE (1 << 0)
30#define TWL4030_PWMX_ENABLE (1 << 2)
31#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
32#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
33
34/* PMBR1 register bits */
35#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
36#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
37#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
38#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
39
40/* Register, bits and macro for TWL6030 */
41#define TWL6030_TOGGLE3_REG 0x92
42
43#define TWL6030_PWMXR (1 << 0)
44#define TWL6030_PWMXS (1 << 1)
45#define TWL6030_PWMXEN (1 << 2)
46#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
47
48struct twl_pwm_chip {
49 struct mutex mutex;
50 u8 twl6030_toggle3;
51 u8 twl4030_pwm_mux;
52};
53
54static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
55{
56 return pwmchip_get_drvdata(chip);
57}
58
59static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
60 u64 duty_ns, u64 period_ns)
61{
62 int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
63 u8 pwm_config[2] = { 1, 0 };
64 int base, ret;
65
66 /*
67 * To configure the duty period:
68 * On-cycle is set to 1 (the minimum allowed value)
69 * The off time of 0 is not configurable, so the mapping is:
70 * 0 -> off cycle = 2,
71 * 1 -> off cycle = 2,
72 * 2 -> off cycle = 3,
73 * 126 - > off cycle 127,
74 * 127 - > off cycle 1
75 * When on cycle == off cycle the PWM will be always on
76 */
77 if (duty_cycle == 1)
78 duty_cycle = 2;
79 else if (duty_cycle > TWL_PWM_MAX)
80 duty_cycle = 1;
81
82 base = pwm->hwpwm * 3;
83
84 pwm_config[1] = duty_cycle;
85
86 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
87 if (ret < 0)
88 dev_err(pwmchip_parent(chip), "%s: Failed to configure PWM\n", pwm->label);
89
90 return ret;
91}
92
93static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
94{
95 struct twl_pwm_chip *twl = to_twl(chip);
96 int ret;
97 u8 val;
98
99 mutex_lock(&twl->mutex);
100 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
101 if (ret < 0) {
102 dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
103 goto out;
104 }
105
106 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
107
108 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
109 if (ret < 0)
110 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
111
112 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
113
114 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
115 if (ret < 0)
116 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
117
118out:
119 mutex_unlock(&twl->mutex);
120 return ret;
121}
122
123static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
124{
125 struct twl_pwm_chip *twl = to_twl(chip);
126 int ret;
127 u8 val;
128
129 mutex_lock(&twl->mutex);
130 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
131 if (ret < 0) {
132 dev_err(pwmchip_parent(chip), "%s: Failed to read GPBR1\n", pwm->label);
133 goto out;
134 }
135
136 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
137
138 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
139 if (ret < 0)
140 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
141
142 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
143
144 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
145 if (ret < 0)
146 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
147
148out:
149 mutex_unlock(&twl->mutex);
150}
151
152static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
153{
154 struct twl_pwm_chip *twl = to_twl(chip);
155 int ret;
156 u8 val, mask, bits;
157
158 if (pwm->hwpwm == 1) {
159 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
160 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
161 } else {
162 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
163 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
164 }
165
166 mutex_lock(&twl->mutex);
167 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
168 if (ret < 0) {
169 dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
170 goto out;
171 }
172
173 /* Save the current MUX configuration for the PWM */
174 twl->twl4030_pwm_mux &= ~mask;
175 twl->twl4030_pwm_mux |= (val & mask);
176
177 /* Select PWM functionality */
178 val &= ~mask;
179 val |= bits;
180
181 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
182 if (ret < 0)
183 dev_err(pwmchip_parent(chip), "%s: Failed to request PWM\n", pwm->label);
184
185out:
186 mutex_unlock(&twl->mutex);
187 return ret;
188}
189
190static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
191{
192 struct twl_pwm_chip *twl = to_twl(chip);
193 int ret;
194 u8 val, mask;
195
196 if (pwm->hwpwm == 1)
197 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
198 else
199 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
200
201 mutex_lock(&twl->mutex);
202 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
203 if (ret < 0) {
204 dev_err(pwmchip_parent(chip), "%s: Failed to read PMBR1\n", pwm->label);
205 goto out;
206 }
207
208 /* Restore the MUX configuration for the PWM */
209 val &= ~mask;
210 val |= (twl->twl4030_pwm_mux & mask);
211
212 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
213 if (ret < 0)
214 dev_err(pwmchip_parent(chip), "%s: Failed to free PWM\n", pwm->label);
215
216out:
217 mutex_unlock(&twl->mutex);
218}
219
220static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
221{
222 struct twl_pwm_chip *twl = to_twl(chip);
223 int ret;
224 u8 val;
225
226 mutex_lock(&twl->mutex);
227 val = twl->twl6030_toggle3;
228 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
229 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
230
231 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
232 if (ret < 0) {
233 dev_err(pwmchip_parent(chip), "%s: Failed to enable PWM\n", pwm->label);
234 goto out;
235 }
236
237 twl->twl6030_toggle3 = val;
238out:
239 mutex_unlock(&twl->mutex);
240 return ret;
241}
242
243static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
244{
245 struct twl_pwm_chip *twl = to_twl(chip);
246 int ret;
247 u8 val;
248
249 mutex_lock(&twl->mutex);
250 val = twl->twl6030_toggle3;
251 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
252 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
253
254 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
255 if (ret < 0) {
256 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
257 goto out;
258 }
259
260 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
261
262 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
263 if (ret < 0) {
264 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
265 goto out;
266 }
267
268 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
269
270 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
271 if (ret < 0) {
272 dev_err(pwmchip_parent(chip), "%s: Failed to disable PWM\n", pwm->label);
273 goto out;
274 }
275
276 twl->twl6030_toggle3 = val;
277out:
278 mutex_unlock(&twl->mutex);
279}
280
281static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
282 const struct pwm_state *state)
283{
284 int err;
285
286 if (state->polarity != PWM_POLARITY_NORMAL)
287 return -EINVAL;
288
289 if (!state->enabled) {
290 if (pwm->state.enabled)
291 twl4030_pwm_disable(chip, pwm);
292
293 return 0;
294 }
295
296 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
297 if (err)
298 return err;
299
300 if (!pwm->state.enabled)
301 err = twl4030_pwm_enable(chip, pwm);
302
303 return err;
304}
305
306static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
307 const struct pwm_state *state)
308{
309 int err;
310
311 if (state->polarity != PWM_POLARITY_NORMAL)
312 return -EINVAL;
313
314 if (!state->enabled) {
315 if (pwm->state.enabled)
316 twl6030_pwm_disable(chip, pwm);
317
318 return 0;
319 }
320
321 err = twl_pwm_config(chip, pwm, state->duty_cycle, state->period);
322 if (err)
323 return err;
324
325 if (!pwm->state.enabled)
326 err = twl6030_pwm_enable(chip, pwm);
327
328 return err;
329}
330
331static const struct pwm_ops twl4030_pwm_ops = {
332 .apply = twl4030_pwm_apply,
333 .request = twl4030_pwm_request,
334 .free = twl4030_pwm_free,
335};
336
337static const struct pwm_ops twl6030_pwm_ops = {
338 .apply = twl6030_pwm_apply,
339};
340
341static int twl_pwm_probe(struct platform_device *pdev)
342{
343 struct pwm_chip *chip;
344 struct twl_pwm_chip *twl;
345
346 chip = devm_pwmchip_alloc(&pdev->dev, 2, sizeof(*twl));
347 if (IS_ERR(chip))
348 return PTR_ERR(chip);
349 twl = to_twl(chip);
350
351 if (twl_class_is_4030())
352 chip->ops = &twl4030_pwm_ops;
353 else
354 chip->ops = &twl6030_pwm_ops;
355
356 mutex_init(&twl->mutex);
357
358 return devm_pwmchip_add(&pdev->dev, chip);
359}
360
361#ifdef CONFIG_OF
362static const struct of_device_id twl_pwm_of_match[] = {
363 { .compatible = "ti,twl4030-pwm" },
364 { .compatible = "ti,twl6030-pwm" },
365 { },
366};
367MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
368#endif
369
370static struct platform_driver twl_pwm_driver = {
371 .driver = {
372 .name = "twl-pwm",
373 .of_match_table = of_match_ptr(twl_pwm_of_match),
374 },
375 .probe = twl_pwm_probe,
376};
377module_platform_driver(twl_pwm_driver);
378
379MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
380MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
381MODULE_ALIAS("platform:twl-pwm");
382MODULE_LICENSE("GPL");
1/*
2 * Driver for TWL4030/6030 Generic Pulse Width Modulator
3 *
4 * Copyright (C) 2012 Texas Instruments
5 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/platform_device.h>
23#include <linux/pwm.h>
24#include <linux/mfd/twl.h>
25#include <linux/slab.h>
26
27/*
28 * This driver handles the PWMs of TWL4030 and TWL6030.
29 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
30 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
31 */
32
33#define TWL_PWM_MAX 0x7f
34
35/* Registers, bits and macro for TWL4030 */
36#define TWL4030_GPBR1_REG 0x0c
37#define TWL4030_PMBR1_REG 0x0d
38
39/* GPBR1 register bits */
40#define TWL4030_PWMXCLK_ENABLE (1 << 0)
41#define TWL4030_PWMX_ENABLE (1 << 2)
42#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
43#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
44
45/* PMBR1 register bits */
46#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
47#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
48#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
49#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
50
51/* Register, bits and macro for TWL6030 */
52#define TWL6030_TOGGLE3_REG 0x92
53
54#define TWL6030_PWMXR (1 << 0)
55#define TWL6030_PWMXS (1 << 1)
56#define TWL6030_PWMXEN (1 << 2)
57#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
58
59struct twl_pwm_chip {
60 struct pwm_chip chip;
61 struct mutex mutex;
62 u8 twl6030_toggle3;
63 u8 twl4030_pwm_mux;
64};
65
66static inline struct twl_pwm_chip *to_twl(struct pwm_chip *chip)
67{
68 return container_of(chip, struct twl_pwm_chip, chip);
69}
70
71static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
72 int duty_ns, int period_ns)
73{
74 int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
75 u8 pwm_config[2] = { 1, 0 };
76 int base, ret;
77
78 /*
79 * To configure the duty period:
80 * On-cycle is set to 1 (the minimum allowed value)
81 * The off time of 0 is not configurable, so the mapping is:
82 * 0 -> off cycle = 2,
83 * 1 -> off cycle = 2,
84 * 2 -> off cycle = 3,
85 * 126 - > off cycle 127,
86 * 127 - > off cycle 1
87 * When on cycle == off cycle the PWM will be always on
88 */
89 if (duty_cycle == 1)
90 duty_cycle = 2;
91 else if (duty_cycle > TWL_PWM_MAX)
92 duty_cycle = 1;
93
94 base = pwm->hwpwm * 3;
95
96 pwm_config[1] = duty_cycle;
97
98 ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
99 if (ret < 0)
100 dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
101
102 return ret;
103}
104
105static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
106{
107 struct twl_pwm_chip *twl = to_twl(chip);
108 int ret;
109 u8 val;
110
111 mutex_lock(&twl->mutex);
112 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
113 if (ret < 0) {
114 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
115 goto out;
116 }
117
118 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
119
120 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
121 if (ret < 0)
122 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
123
124 val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
125
126 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
127 if (ret < 0)
128 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
129
130out:
131 mutex_unlock(&twl->mutex);
132 return ret;
133}
134
135static void twl4030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
136{
137 struct twl_pwm_chip *twl = to_twl(chip);
138 int ret;
139 u8 val;
140
141 mutex_lock(&twl->mutex);
142 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
143 if (ret < 0) {
144 dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
145 goto out;
146 }
147
148 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
149
150 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
151 if (ret < 0)
152 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
153
154 val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
155
156 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
157 if (ret < 0)
158 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
159
160out:
161 mutex_unlock(&twl->mutex);
162}
163
164static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
165{
166 struct twl_pwm_chip *twl = to_twl(chip);
167 int ret;
168 u8 val, mask, bits;
169
170 if (pwm->hwpwm == 1) {
171 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
172 bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
173 } else {
174 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
175 bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
176 }
177
178 mutex_lock(&twl->mutex);
179 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
180 if (ret < 0) {
181 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
182 goto out;
183 }
184
185 /* Save the current MUX configuration for the PWM */
186 twl->twl4030_pwm_mux &= ~mask;
187 twl->twl4030_pwm_mux |= (val & mask);
188
189 /* Select PWM functionality */
190 val &= ~mask;
191 val |= bits;
192
193 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
194 if (ret < 0)
195 dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
196
197out:
198 mutex_unlock(&twl->mutex);
199 return ret;
200}
201
202static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
203{
204 struct twl_pwm_chip *twl = to_twl(chip);
205 int ret;
206 u8 val, mask;
207
208 if (pwm->hwpwm == 1)
209 mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
210 else
211 mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
212
213 mutex_lock(&twl->mutex);
214 ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
215 if (ret < 0) {
216 dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
217 goto out;
218 }
219
220 /* Restore the MUX configuration for the PWM */
221 val &= ~mask;
222 val |= (twl->twl4030_pwm_mux & mask);
223
224 ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
225 if (ret < 0)
226 dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
227
228out:
229 mutex_unlock(&twl->mutex);
230}
231
232static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
233{
234 struct twl_pwm_chip *twl = to_twl(chip);
235 int ret;
236 u8 val;
237
238 mutex_lock(&twl->mutex);
239 val = twl->twl6030_toggle3;
240 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
241 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
242
243 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
244 if (ret < 0) {
245 dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
246 goto out;
247 }
248
249 twl->twl6030_toggle3 = val;
250out:
251 mutex_unlock(&twl->mutex);
252 return ret;
253}
254
255static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
256{
257 struct twl_pwm_chip *twl = to_twl(chip);
258 int ret;
259 u8 val;
260
261 mutex_lock(&twl->mutex);
262 val = twl->twl6030_toggle3;
263 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
264 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
265
266 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
267 if (ret < 0) {
268 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
269 goto out;
270 }
271
272 val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
273
274 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
275 if (ret < 0) {
276 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
277 goto out;
278 }
279
280 val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
281
282 ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
283 if (ret < 0) {
284 dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
285 goto out;
286 }
287
288 twl->twl6030_toggle3 = val;
289out:
290 mutex_unlock(&twl->mutex);
291}
292
293static const struct pwm_ops twl4030_pwm_ops = {
294 .config = twl_pwm_config,
295 .enable = twl4030_pwm_enable,
296 .disable = twl4030_pwm_disable,
297 .request = twl4030_pwm_request,
298 .free = twl4030_pwm_free,
299 .owner = THIS_MODULE,
300};
301
302static const struct pwm_ops twl6030_pwm_ops = {
303 .config = twl_pwm_config,
304 .enable = twl6030_pwm_enable,
305 .disable = twl6030_pwm_disable,
306 .owner = THIS_MODULE,
307};
308
309static int twl_pwm_probe(struct platform_device *pdev)
310{
311 struct twl_pwm_chip *twl;
312 int ret;
313
314 twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
315 if (!twl)
316 return -ENOMEM;
317
318 if (twl_class_is_4030())
319 twl->chip.ops = &twl4030_pwm_ops;
320 else
321 twl->chip.ops = &twl6030_pwm_ops;
322
323 twl->chip.dev = &pdev->dev;
324 twl->chip.base = -1;
325 twl->chip.npwm = 2;
326
327 mutex_init(&twl->mutex);
328
329 ret = pwmchip_add(&twl->chip);
330 if (ret < 0)
331 return ret;
332
333 platform_set_drvdata(pdev, twl);
334
335 return 0;
336}
337
338static int twl_pwm_remove(struct platform_device *pdev)
339{
340 struct twl_pwm_chip *twl = platform_get_drvdata(pdev);
341
342 return pwmchip_remove(&twl->chip);
343}
344
345#ifdef CONFIG_OF
346static const struct of_device_id twl_pwm_of_match[] = {
347 { .compatible = "ti,twl4030-pwm" },
348 { .compatible = "ti,twl6030-pwm" },
349 { },
350};
351MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
352#endif
353
354static struct platform_driver twl_pwm_driver = {
355 .driver = {
356 .name = "twl-pwm",
357 .of_match_table = of_match_ptr(twl_pwm_of_match),
358 },
359 .probe = twl_pwm_probe,
360 .remove = twl_pwm_remove,
361};
362module_platform_driver(twl_pwm_driver);
363
364MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
365MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
366MODULE_ALIAS("platform:twl-pwm");
367MODULE_LICENSE("GPL");